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1912.13104
Adnan Aboulala\^a
Adnan Aboulalaa
Propagation of microlocal singularities for stochastic partial differential equations
25 pages
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Microlocal analysis techniques are extended and applied to stochastic partial differential equations (SPDEs). In particular, the H\"ormander propagation of singularities theorem is shown to be valid for hyperbolic SPDEs driven by a standard Brownian motion. In this case the wave front set of the solution is invariant under the stochastic Hamiltonian flow associated to the principal symbol of the SPDE. This study leads to the introduction of a class of random pseudodifferential operators.
[ { "created": "Mon, 30 Dec 2019 22:37:35 GMT", "version": "v1" }, { "created": "Tue, 29 Dec 2020 22:33:18 GMT", "version": "v2" }, { "created": "Mon, 27 Sep 2021 21:28:27 GMT", "version": "v3" }, { "created": "Fri, 23 Dec 2022 18:11:36 GMT", "version": "v4" } ]
2022-12-26
[ [ "Aboulalaa", "Adnan", "" ] ]
19
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1,225,000
1912.13105
Lauri Toikka
A. Mu\~noz Mateo and Y. G. Rubo and L. A. Toikka
Long Josephson junctions with exciton-polariton condensates
null
Phys. Rev. B 101, 184509 (2020)
10.1103/PhysRevB.101.184509
null
cond-mat.quant-gas cond-mat.mes-hall cond-mat.supr-con nlin.PS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate the possibility to build stable Josephson $\pi$-junction stripes with exciton-polariton condensates. The stability of the $\pi$-junction between arbitrary long polariton stripes is achieved at low pumping by balancing the snaking instability with counter-propagating flows towards the junction. Not dissimilar from a dark soliton, the instability becomes relevant at high pumping leading to formation of vortex dipoles. The resulting structures can be stabilised to produce static lattices of Josephson vortices in straight and ring geometries. Our results build towards realization of quantum technological applications based on the Josephson effect at room temperature.
[ { "created": "Mon, 30 Dec 2019 22:37:48 GMT", "version": "v1" } ]
2020-05-20
[ [ "Mateo", "A. Muñoz", "" ], [ "Rubo", "Y. G.", "" ], [ "Toikka", "L. A.", "" ] ]
19
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1,225,001
1912.13106
Xiaotong Liu
Xiaotong Liu, Yingbei Tong, Anbang Xu, Rama Akkiraju
An Empirical Study of Factors Affecting Language-Independent Models
null
null
null
null
cs.CL cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Scaling existing applications and solutions to multiple human languages has traditionally proven to be difficult, mainly due to the language-dependent nature of preprocessing and feature engineering techniques employed in traditional approaches. In this work, we empirically investigate the factors affecting language-independent models built with multilingual representations, including task type, language set and data resource. On two most representative NLP tasks -- sentence classification and sequence labeling, we show that language-independent models can be comparable to or even outperforms the models trained using monolingual data, and they are generally more effective on sentence classification. We experiment language-independent models with many different languages and show that they are more suitable for typologically similar languages. We also explore the effects of different data sizes when training and testing language-independent models, and demonstrate that they are not only suitable for high-resource languages, but also very effective in low-resource languages.
[ { "created": "Mon, 30 Dec 2019 22:41:57 GMT", "version": "v1" } ]
2020-01-01
[ [ "Liu", "Xiaotong", "" ], [ "Tong", "Yingbei", "" ], [ "Xu", "Anbang", "" ], [ "Akkiraju", "Rama", "" ] ]
19
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1,225,002
1912.13107
Jennifer Hobbs
Jennifer Hobbs, Matthew Holbrook, Nathan Frank, Long Sha, Patrick Lucey
Improved Structural Discovery and Representation Learning of Multi-Agent Data
null
null
null
null
cs.LG cs.MA stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Central to all machine learning algorithms is data representation. For multi-agent systems, selecting a representation which adequately captures the interactions among agents is challenging due to the latent group structure which tends to vary depending on context. However, in multi-agent systems with strong group structure, we can simultaneously learn this structure and map a set of agents to a consistently ordered representation for further learning. In this paper, we present a dynamic alignment method which provides a robust ordering of structured multi-agent data enabling representation learning to occur in a fraction of the time of previous methods. We demonstrate the value of this approach using a large amount of soccer tracking data from a professional league.
[ { "created": "Mon, 30 Dec 2019 22:49:55 GMT", "version": "v1" } ]
2020-01-01
[ [ "Hobbs", "Jennifer", "" ], [ "Holbrook", "Matthew", "" ], [ "Frank", "Nathan", "" ], [ "Sha", "Long", "" ], [ "Lucey", "Patrick", "" ] ]
19
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1,225,003
1912.13108
Nicholas Warner
Nicholas P. Warner
Lectures on Microstate Geometries
53 pages; 4 figures
null
null
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
These are notes for some introductory lectures about microstate geometries and their construction. The first lecture considers BPS black holes in four dimensions as a way to introduce what one should expect from the BPS equations. The second lecture discusses the "no solitons without topology" theorem. The subsequent lectures move on to the construction and properties of bubbled microstate geometries in five dimensions. Since these are graduate lectures, they involve a strongly computational narrative intended to build some proficiency and understanding of supersymmetric solitons in five-dimensions. The narrative also regularly "plays tourist" pointing to specific features that are more general or have broader impact. The last sections contain brief comments on the larger setting of microstate geometries and describe some of the more recent developments. These lectures were given as a mini-course at the IPhT, Saclay in May, 2019.
[ { "created": "Mon, 30 Dec 2019 22:51:20 GMT", "version": "v1" } ]
2020-01-01
[ [ "Warner", "Nicholas P.", "" ] ]
19
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1,225,004
1912.13109
Vivek Gupta
Vivek Kumar Gupta
"Hinglish" Language -- Modeling a Messy Code-Mixed Language
null
null
null
null
cs.CL cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With a sharp rise in fluency and users of "Hinglish" in linguistically diverse country, India, it has increasingly become important to analyze social content written in this language in platforms such as Twitter, Reddit, Facebook. This project focuses on using deep learning techniques to tackle a classification problem in categorizing social content written in Hindi-English into Abusive, Hate-Inducing and Not offensive categories. We utilize bi-directional sequence models with easy text augmentation techniques such as synonym replacement, random insertion, random swap, and random deletion to produce a state of the art classifier that outperforms the previous work done on analyzing this dataset.
[ { "created": "Mon, 30 Dec 2019 23:01:28 GMT", "version": "v1" } ]
2020-01-01
[ [ "Gupta", "Vivek Kumar", "" ] ]
19
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1,225,005
1912.13110
Donghan Kim
Donghan Kim
Open Markets
47 pages
null
null
null
q-fin.MF
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An open market is a subset of an entire equity market composed of a certain fixed number of top capitalization stocks. Though the number of stocks in the open market is fixed, the constituents of the market change over time as each company's rank by its market capitalization fluctuates. When one is allowed to invest also in the money market, the open market resembles the entire 'closed' equity market in the sense that the equivalence of market viability (lack of arbitrage) and the existence of numeraire portfolio (portfolio which cannot be outperformed) holds. When access to the money market is prohibited, some topics such as Capital Asset Pricing Model (CAPM), construction of functionally generated portfolios, and the concept of the universal portfolio are presented in the open market setting.
[ { "created": "Mon, 30 Dec 2019 23:01:54 GMT", "version": "v1" } ]
2020-01-01
[ [ "Kim", "Donghan", "" ] ]
19
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1,225,006
1912.13111
J\'er\^ome Tribollet
J\'er\^ome Tribollet
Hybrid nanophotonic-nanomagnonic SiC-YiG quantum sensor: II/ optical fiber based ODMR and OP-PELDOR experiments on bulk HPSI 4H-SiC
7 figures; 14 pages
null
null
null
quant-ph cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Here I present my first fiber based coupled optical and EPR experiments associated to the development of a new SiC-YiG quantum sensor that I recently theoretically described (arXiv:1912.11634). This quantum sensor was designed to allow sub-nanoscale single external spin sensitivity optically detected pulsed electron electron double resonance spectroscopy, using an X band pulsed EPR spectrometer, an optical fiber, and a photoluminescence setup. First key experiments before the demonstration of ODPELDOR spectroscopy are presented here. They were performed on a bulk 4H-SiC sample containing an ensemble of residual V2 color centers (spin S=3/2). Here I demonstrate i/ optical pumping assisted pulsed EPR experiments, ii/ fiber based ODMR and optically detected RABI oscillations, and iii/ optical pumping assisted PELDOR experiments, and iv/ some spin wave resonance experiments. Those experiments confirm the feasability of the new quantum sensing approach proposed.
[ { "created": "Mon, 30 Dec 2019 23:01:58 GMT", "version": "v1" } ]
2020-01-01
[ [ "Tribollet", "Jérôme", "" ] ]
19
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1,225,007
1912.13112
Sergei A. Grebenev
A.S. Pozanenko (1,2), P.Yu. Minaev (1), S.A. Grebenev (1), I.V. Chelovekov (1) ((1) Space Research Institute, Russian Academy of Sciences, (2) National Research University "High School of Economics")
Observation of the second LIGO/Virgo event connected with binary neutron star merger S190425z in the gamma-ray range
16 pages, 7 figures, 2 tables
Astronomy Letters, 45 (2019), 710-727
10.1134/S1063773719110057
null
astro-ph.HE gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Observations of the gravitational-wave (GW) event S190425z registered by the LIGO/Virgo detectors with the Anti-Coincidence Shield (ACS) of the gamma-ray spectrometer SPI aboard the INTEGRAL observatory are presented. With a high probability (>99%) it was associated with a neutron star (NS) merger in a close binary system. This is only the second event of such type in the history of GW observations (after GW170817). A weak gamma-ray burst, GRB190425, consisting of two pulses in ~0.5 and ~5.9 s after the NS merging in S190425z was detected by SPI-ACS. The pulses had a priori reliability of 3.5 and 4.4 sigma as single events and 5.5 sigma as a combined event. Analysis of the SPI-ACS count rate history recorded these days (~125 ks in total) has shown that the rate of appearance of two close pulses with characteristics of GRB190425 by chance does not exceed 6.4 x 10^{-5} s^{-1}. We note that the time profile of GRB190425 has a lot in common with the profile of the GRB170817A burst accompanying the GW170817 event; that both the NS mergers were the closest (<150 Mpc) of all the events registered by the LIGO/Virgo detectors; and that there were no confident excesses of gamma-ray emission over the background detected in any of >30 black hole merger events recorded to the moment by these detectors. No hard X-ray flares were detected in the field of view of the SPI and IBIS-ISGRI gamma-ray telescopes aboard INTEGRAL. This, as well as the lack of detection of gamma-ray emission from GRB190425 by the GBM monitor of the Fermi observatory assuming its occultation by the Earth, can significantly reduce the localization area for the source of this GW event. The estimates of the parameters E_{iso} and E_{p} for GRB190425 are obtained and compared with the similar parameters for GRB170817A.
[ { "created": "Mon, 30 Dec 2019 23:02:05 GMT", "version": "v1" } ]
2020-02-13
[ [ "Pozanenko", "A. S.", "" ], [ "Minaev", "P. Yu.", "" ], [ "Grebenev", "S. A.", "" ], [ "Chelovekov", "I. V.", "" ] ]
19
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1,225,008
1912.13113
Romain Giraud
Aoyu Tan, Valentin Labracherie, Narayan Kunchur, Anja U.B. Wolter, Joaquin Cornejo, Joseph Dufouleur, Bernd B\"uchner, Anna Isaeva, Romain Giraud
Meta-magnetism of weakly-coupled antiferromagnetic topological insulators
22 pages, 8 figures; typos corrected, references added
Phys. Rev. Lett. 124, 197201 (2020)
10.1103/PhysRevLett.124.197201
null
cond-mat.mes-hall cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The magnetic properties of the van der Waals magnetic topological insulators MnBi$_2$Te$_4$ and MnBi$_4$Te$_7$ are investigated by magneto-transport measurements. We evidence that the relative strength of the inter-layer exchange coupling J to the uniaxial anisotropy K controls a transition from an A-type antiferromagnetic order to a ferromagnetic-like metamagnetic state. A bi-layer Stoner-Wohlfarth model allows us to describe this evolution, as well as the typical angular dependence of specific signatures, such as the spin-flop transition of the uniaxial antiferromagnet and the switching field of the metamagnet.
[ { "created": "Mon, 30 Dec 2019 23:03:05 GMT", "version": "v1" }, { "created": "Thu, 9 Jan 2020 13:23:41 GMT", "version": "v2" } ]
2020-05-20
[ [ "Tan", "Aoyu", "" ], [ "Labracherie", "Valentin", "" ], [ "Kunchur", "Narayan", "" ], [ "Wolter", "Anja U. B.", "" ], [ "Cornejo", "Joaquin", "" ], [ "Dufouleur", "Joseph", "" ], [ "Büchner", "Bernd", "" ], [ "Isaeva", "Anna", "" ], [ "Giraud", "Romain", "" ] ]
19
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1,225,009
1912.13114
Andrew K. Waldron
A. Rod Gover and Andrew Waldron
Singular Yamabe and Obata Problems
17 pages LaTeX
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A conformal geometry determines a distinguished, potentially singular, variant of the usual Yamabe problem, where the conformal factor can change sign. When a smooth solution does change sign, its zero locus is a smoothly embedded separating hypersurface that, in dimension three, is necessarily a Willmore energy minimiser or, in higher dimensions, satisfies a conformally invariant analog of the Willmore equation. In any case the zero locus is critical for a conformal functional that generalises the total Q-curvature by including extrinsic data. These observations lead to some interesting global problems that include natural singular variants of a classical problem solved by Obata.
[ { "created": "Mon, 30 Dec 2019 23:10:06 GMT", "version": "v1" } ]
2020-01-01
[ [ "Gover", "A. Rod", "" ], [ "Waldron", "Andrew", "" ] ]
19
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-0.8125377297401428, -0.2995600998401642 ]
1,225,010
1912.13115
Daniel Bennett
Daniel Bennett, Maitane Mu\~noz-Basagoiti, and Emilio Artacho
Electrostatics and domains in ferroelectric superlattices
11 pages, 11 figures
null
10.1098/rsos.201270
null
cond-mat.mes-hall cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The electrostatics arising in ferroelectric/dielectric two-dimensional heterostructures and superlatitices is revisited here within a simplest Kittel model, in order to define a clear paradigmatic reference for domain formation. The screening of the depolarizing field in isolated ferroelectric or polar thin films via the formation of 180$^{\circ}$ domains is well understood, whereby the width of the domains $w$ grows as the square-root of the film thickness $d$, following Kittel's law, for thick enough films ($w\ll d$). This behavior is qualitatively unaltered when the film is deposited on a dielectric substrate, sandwiched between dielectrics, and even in a superlattice setting, with just a suitable renormalisation of Kittel's length. As $d$ decreases, $w(d)$ deviates from Kittel's law, reaching a minimum and then diverging onto the mono-domain limit for thin enough films, always assuming a given spontaneous polarization $P$ of the ferrolectric, only modified by linear response to the depolarizing field. In most cases of experimental relevance $P$ would vanish before reaching that thin-film regime. This is not the case for superlattices. Unlike single films, for which the increase of the dielectric constant of the surrounding medium pushes the deviation from the Kittel's regime to lower values of $d$, there is a critical value of the relative thickness of ferroelectric/dielectric films in superlattices beyond which that behavior is reversed, and which defines the separation between strong and weak ferroelectric coupling in superlattices.
[ { "created": "Mon, 30 Dec 2019 23:27:44 GMT", "version": "v1" } ]
2022-08-12
[ [ "Bennett", "Daniel", "" ], [ "Muñoz-Basagoiti", "Maitane", "" ], [ "Artacho", "Emilio", "" ] ]
19
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1,225,011
1912.13116
Cameron Thieme
Cameron Thieme
Isolating Neighborhoods and Filippov Systems: Extending Conley Theory to Differential Inclusions
21 pages, 3 figures New upload updates: Most importantly, several references are added who have done similar work. Also, several typos are fixed, and some style elements are changed (such as indents after headings). Contact information, keywords, and subject classifiers are added
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math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Conley index theory is a powerful topological tool for obtaining information about invariant sets in continuous dynamical systems. A key feature of Conley theory is that the index is robust under perturbation; given a continuous family of flows $\{\varphi_\lambda\}$, the index remains constant over a range of parameter values, avoiding many of the complications associated with bifurcations. This theory is well-developed for flows and homomorphisms, and has even been extended to certain classes of semiflows. However, in recent years mathematicians and scientists have become interested in differential inclusions, often called Filippov systems, and Conley theory has not yet been developed in this setting. This paper aims to begin extending the index theory to this larger class of dynamical systems. In particular, we introduce a notion of perturbation that is suitable for this setting and show that isolating neighborhoods, a fundamental object in Conley index theory, are stable under this sense of perturbation. We also discuss how perturbation in this sense allows us to provide rigorous results about "nearby smooth systems" by analyzing the discontinuous Filippov system.
[ { "created": "Mon, 30 Dec 2019 23:52:13 GMT", "version": "v1" }, { "created": "Wed, 23 Sep 2020 21:31:47 GMT", "version": "v2" } ]
2020-09-25
[ [ "Thieme", "Cameron", "" ] ]
19
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1,225,012
1912.13117
L\'aszl\'o Kozma
L\'aszl\'o Kozma
Exact exponential algorithms for two poset problems
small fixes and improvements
null
null
null
cs.DS math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Partially ordered sets (posets) are fundamental combinatorial objects with important applications in computer science. Perhaps the most natural algorithmic task, given a size-$n$ poset, is to compute its number of linear extensions. In 1991 Brightwell and Winkler showed this problem to be $\#P$-hard. In spite of extensive research, the fastest known algorithm is still the straightforward $O(n 2^n)$-time dynamic programming (an adaptation of the Bellman-Held-Karp algorithm for the TSP). Very recently, Dittmer and Pak showed that the problem remains $\#P$-hard for two-dimensional posets, and no algorithm was known to break the $2^n$-barrier even in this special case. The question of whether the two-dimensional problem is easier than the general case was raised decades ago by M\"ohring, Felsner and Wernisch, and others. In this paper we show that the number of linear extensions of a two-dimensional poset can be computed in time $O(1.8172^n)$. The related jump number problem asks for a linear extension of a poset, minimizing the number of neighboring incomparable pairs. The problem has applications in scheduling, and has been widely studied. In 1981 Pulleyblank showed it to be NP-complete. We show that the jump number problem can be solved (in arbitrary posets) in time $O(1.824^n)$. This improves (slightly) the previous best bound of Kratsch and Kratsch.
[ { "created": "Mon, 30 Dec 2019 23:57:19 GMT", "version": "v1" }, { "created": "Mon, 20 Apr 2020 14:42:41 GMT", "version": "v2" }, { "created": "Thu, 11 Jun 2020 22:59:14 GMT", "version": "v3" } ]
2020-06-15
[ [ "Kozma", "László", "" ] ]
19
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1,225,013
1912.13118
Deepesh Toshniwal
Deepesh Toshniwal and Nelly Villamizar
Dimension of polynomial splines of mixed smoothness on T-meshes
null
null
10.1016/j.cagd.2020.101880
null
math.NA cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we study the dimension of splines of mixed smoothness on axis-aligned T-meshes. This is the setting when different orders of smoothness are required across the edges of the mesh. Given a spline space whose dimension is independent of its T-mesh's geometric embedding, we present constructive and sufficient conditions that ensure that the smoothness across a subset of the mesh edges can be reduced while maintaining stability of the dimension. The conditions have a simple geometric interpretation. Examples are presented to show the applicability of the results on both hierarchical and non-hierarchical T-meshes. For hierarchal T-meshes it is shown that mixed smoothness spline spaces that contain the space of PHT-splines (Deng et al., 2008) always have stable dimension.
[ { "created": "Mon, 30 Dec 2019 23:59:34 GMT", "version": "v1" } ]
2020-12-08
[ [ "Toshniwal", "Deepesh", "" ], [ "Villamizar", "Nelly", "" ] ]
19
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1,225,014
1912.13119
Garritt Page
Garritt L. Page, Fernando A. Quintana, Peter M\"uller
Clustering and Prediction with Variable Dimension Covariates
null
null
null
null
stat.ME
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In many applied fields incomplete covariate vectors are commonly encountered. It is well known that this can be problematic when making inference on model parameters, but its impact on prediction performance is less understood. We develop a method based on covariate dependent partition models that seamlessly handles missing covariates while completely avoiding any type of imputation. The method we develop allows in-sample predictions as well as out-of-sample prediction, even if the missing pattern in the new subjects' incomplete covariate vector was not seen in the training data. Any data type, including categorical or continuous covariates are permitted. In simulation studies the proposed method compares favorably. We illustrate the method in two application examples.
[ { "created": "Tue, 31 Dec 2019 00:00:41 GMT", "version": "v1" }, { "created": "Sun, 12 Jul 2020 18:48:38 GMT", "version": "v2" } ]
2020-07-14
[ [ "Page", "Garritt L.", "" ], [ "Quintana", "Fernando A.", "" ], [ "Müller", "Peter", "" ] ]
19
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1,225,015
1912.13120
Masahito Hayashi
Masahito Hayashi and Angeles Vazquez-Castro
Physical Layer Security Protocol for Poisson Channels for Passive Man-in-the-middle Attack
null
IEEE Transactions on Information Forensics and Security, Volume: 15, Issue: 1, 2295 - 2305 (2020)
10.1109/TIFS.2019.2963771
null
cs.CR cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work, we focus on the classical optical channel having Poissonian statistical behavior and propose a novel secrecy coding-based physical layer protocol. Our protocol is different but complementary to both (computationally secure) quantum immune cryptographic protocols and (information theoretically secure) quantum cryptographic protocols. Specifically, our (information theoretical) secrecy coding protocol secures classical digital information bits at photonic level exploiting the random nature of the Poisson channel. It is known that secrecy coding techniques for the Poisson channel based on the classical one-way wiretap channel (introduced by Wyner in 1975) ensure secret communication only if the mutual information to the eavesdropper is smaller than that to the legitimate receiver. In order to overcome such a strong limitation, we introduce a two-way protocol that always ensures secret communication independently of the conditions of legitimate and eavesdropper channels. We prove this claim showing rigorous comparative derivation and analysis of the information theoretical secrecy capacity of the classical one-way and of the proposed two-way protocols. We also show numerical calculations that prove drastic gains and strong practical potential of our proposed two-way protocol to secure information transmission over optical channels.
[ { "created": "Tue, 31 Dec 2019 00:02:53 GMT", "version": "v1" } ]
2022-04-26
[ [ "Hayashi", "Masahito", "" ], [ "Vazquez-Castro", "Angeles", "" ] ]
19
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1,225,016
1912.13121
Enrico Bertolazzi
Enrico Bertolazzi and Riccardo Ghiloni and Ruben Specogna
Efficient computation of Linking number with certification
19 pages 1 figure
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null
math.AT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An efficient numerical algorithm for the computation of linking number is presented. The algorithm keep tracks or rounding error so that it can ensure the correctness of the results.
[ { "created": "Tue, 31 Dec 2019 00:08:11 GMT", "version": "v1" } ]
2020-01-01
[ [ "Bertolazzi", "Enrico", "" ], [ "Ghiloni", "Riccardo", "" ], [ "Specogna", "Ruben", "" ] ]
19
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1,225,017
1912.13122
Andres Garcia-Camino PhD
Andr\'es Garc\'ia-Camino
Towards Regulated Deep Learning
In this version I added Goal Alignment
null
null
null
cs.AI cs.LG cs.LO cs.MA cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Regulation of Multi-Agent Systems (MAS) and Declarative Electronic Institutions (DEIs) was a multidisciplinary research topic of the past decade involving (Physical and Software) Agents and Law since the beginning, but recently evolved towards News-claimed Robot Lawyer since 2016. One of these first proposals of restricting the behaviour of Software Agents was Electronic Institutions.However, with the recent reformulation of Artificial Neural Networks (ANNs) as Deep Learning (DL), Security, Privacy,Ethical and Legal issues regarding the use of DL has raised concerns in the Artificial Intelligence (AI) Community. Now that the Regulation of MAS is almost correctly addressed, we propose the Regulation of Artificial Neural Networks as Agent-based Training of a special type of regulated Artificial Neural Network that we call Institutional Neural Network (INN).The main purpose of this paper is to bring attention to Artificial Teaching (AT) and to give a tentative answer showing a proof-of-concept implementation of Regulated Deep Learning (RDL). This paper introduces the former concept and provide $I^*$, a language previously used to model declaratively and extend Electronic Institutions, as a means to regulate the execution of Artificial Neural Networks and their interactions with Artificial Teachers (ATs)
[ { "created": "Tue, 31 Dec 2019 00:10:50 GMT", "version": "v1" }, { "created": "Sat, 11 Jul 2020 22:36:52 GMT", "version": "v2" }, { "created": "Fri, 24 Jul 2020 17:19:26 GMT", "version": "v3" }, { "created": "Thu, 13 Jul 2023 17:56:30 GMT", "version": "v4" }, { "created": "Tue, 18 Jul 2023 23:53:12 GMT", "version": "v5" }, { "created": "Fri, 21 Jul 2023 02:04:53 GMT", "version": "v6" }, { "created": "Thu, 27 Jul 2023 12:22:27 GMT", "version": "v7" } ]
2023-07-28
[ [ "García-Camino", "Andrés", "" ] ]
19
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1,225,018
1912.13123
Alexander Teretenkov
A.E. Teretenkov
One-particle approximation as a simple playground for irreversible quantum evolution
null
Discontinuity, Nonlinearity, and Complexity 9 (4), 567-577 (2020)
10.5890/DNC.2020.12.010
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Both quantum information features and irreversible quantum evolution of the models arising in physical systems in one-particle approximation are discussed. It is shown that the calculation of the reduced density matrix and entanglement analysis are considerably simplified in this case. The irreversible quantum evolution described by Gorini--Kossakowski--Sudarshan--Lindblad equations in the one-particle approximation could be defined by a solution of a Shroedinger equation with a dissipative generator. It simplifies the solution of the initial equation on the one side and gives a physical interpretation of such a Shroedinger equation with non-Hermitian Hamiltonian on the other side.
[ { "created": "Tue, 31 Dec 2019 00:14:46 GMT", "version": "v1" }, { "created": "Sat, 4 Apr 2020 08:47:45 GMT", "version": "v2" } ]
2020-08-21
[ [ "Teretenkov", "A. E.", "" ] ]
19
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-0.32507967948913574, 0.24697551131248474, 0.5163012742996216, -0.490177184343338 ]
1,225,019
1912.13124
Sergey Storchak
S. N. Storchak
Path integrals on a manifold that is a product of the total space of the principal fiber bundle and the vector space
28 pages, preliminary version
null
null
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using the path integral measure factorization method based on the nonlinear filtering equation from the stochastic process theory, we consider the reduction procedure in Wiener path integrals for a mechanical system with symmetry that describes the motion of two interacting scalar particles on a special smooth compact Riemannian manifold - the product of total space of the principal fiber bundle and the vector space. The original manifold, the configuration space of this system, is endowed with an isometric free proper action of a compact semisimple unimodular Lie group. The proposed reduction procedure leads to the integral relation between path integrals that represent fundamental solutions of the inverse Kolmogorov equations on the initial and reduced manifolds. For the case of reduction onto the zero-momentum level, the reduction Jacobian is obtained, which is an additional potential term to the Hamiltonian.
[ { "created": "Tue, 31 Dec 2019 00:19:01 GMT", "version": "v1" } ]
2020-01-01
[ [ "Storchak", "S. N.", "" ] ]
19
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1,225,020
1912.13125
Wlodzimierz Jastrzebski
Asen Pashov, Pawel Kowalczyk, Wlodzimierz Jastrzebski
Absolute numbering of asymptotic vibrational levels of diatomic molecules from cold physics experiments
null
null
10.1103/PhysRevA.101.012512
null
physics.chem-ph cond-mat.quant-gas physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a simple method for determination of absolute vibrational numbering of isolated near dissociation levels in diatomic molecules, usually observed in cold physics experiments. The method is based on the isotope shift and works even when energies of only two levels from one isotopologue and one level from another isotopologue have been measured. It is demonstrated on data from recently reported precise measurements of binding energies of levels lying close to the dissociation limits in ultracold Yb2, CsYb, RbSr and RbYb molecules. Its predictions agree with these of much more elaborate multi-isotope potential curve fitting. PACS numbers: 31.50.Bc, 33.20.Kf, 33.20.Vq, 33.50.Dq
[ { "created": "Tue, 31 Dec 2019 00:26:27 GMT", "version": "v1" } ]
2020-02-19
[ [ "Pashov", "Asen", "" ], [ "Kowalczyk", "Pawel", "" ], [ "Jastrzebski", "Wlodzimierz", "" ] ]
19
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1,225,021
1912.13126
Zsolt P\'ales
Zsolt P\'ales
An elementary proof for the decomposition theorem of Wright convex functions
null
null
10.2478/amsil-2020-0010
null
math.CA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The main goal of this paper is to give a completely elementary proof for the decomposition theorem of Wright convex functions which was discovered by C.\ T.\ Ng in 1987. In the proof, we do not use transfinite tools, i.e., variants of Rod\'e's theorem, or de Bruijn's theorem related to functions with continuous differences.
[ { "created": "Tue, 31 Dec 2019 00:33:49 GMT", "version": "v1" } ]
2020-11-23
[ [ "Páles", "Zsolt", "" ] ]
19
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1,225,022
1912.13127
Takeshi Yamazaki
Junpei Kakazu, Ken-ichi Ishikawa, Naruhito Ishizuka, Yoshinobu Kuramashi, Yoshifumi Nakamura, Yusuke Namekawa, Yusuke Taniguchi, Naoya Ukita, Takeshi Yamazaki, and Tomoteru Yoshi\'e (PACS Collaboration)
$K_{l3}$ form factors at the physical point on (10.9 fm)$^3$ volume
34 pages and 11 figures
Phys. Rev. D 101, 094504 (2020)
10.1103/PhysRevD.101.094504
UTHEP-743, UTCCS-P-128, HUPD-1916
hep-lat
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the calculation of the $K_{l3}$ form factors with $N_f = 2 + 1$ nonperturbatively $O(a)$-improved Wilson quark action and Iwasaki gauge action at the physical point on a large volume of (10.9 fm)$^3$ at one lattice spacing of $a = 0.085$ fm. We extract the form factors from 3-point functions with three different time separations between the source and sink operators to confirm suppression of excited state contributions. The form factors are calculated in very close to the zero momentum transfer, $q^2 = 0$, thanks to the large volume, so that stable interpolations to $q^2 = 0$ are carried out. Using our form factors, we obtain the form factor at $q^2 = 0$, $f_+(0) = 0.9603(16)(^{+14}_{\ -4})(44)(19)(1)$, where the first, second, and fifth errors are statistical, systematic errors from fit functions and the isospin breaking effect, respectively. The third and fourth errors denote the finite lattice spacing effects estimated from the renormalization factor and contribution beyond the leading order SU(3) chiral perturbation theory (ChPT). The result of $f_+(0)$ yields the Cabibbo-Kobayashi-Maskawa (CKM) matrix element, $|V_{us}| = 0.2255(13)(4)$, where the first error comes from our calculation and the second from the experiment. This value is consistent with the ones determined from the unitarity of the CKM matrix and the $K_{l2}$ decay within one standard deviation, while it is slightly larger than recent lattice calculations by at most 1.5 $\sigma$. Furthermore, we evaluate the shape of the form factors and the phase space integral from our results. We confirm that those results are consistent with the experiment, and also $|V_{us}|$ determined with our phase space integral agrees with the one in the above.
[ { "created": "Tue, 31 Dec 2019 00:48:01 GMT", "version": "v1" }, { "created": "Wed, 13 May 2020 13:38:08 GMT", "version": "v2" } ]
2020-05-20
[ [ "Kakazu", "Junpei", "", "PACS Collaboration" ], [ "Ishikawa", "Ken-ichi", "", "PACS Collaboration" ], [ "Ishizuka", "Naruhito", "", "PACS Collaboration" ], [ "Kuramashi", "Yoshinobu", "", "PACS Collaboration" ], [ "Nakamura", "Yoshifumi", "", "PACS Collaboration" ], [ "Namekawa", "Yusuke", "", "PACS Collaboration" ], [ "Taniguchi", "Yusuke", "", "PACS Collaboration" ], [ "Ukita", "Naoya", "", "PACS Collaboration" ], [ "Yamazaki", "Takeshi", "", "PACS Collaboration" ], [ "Yoshié", "Tomoteru", "", "PACS Collaboration" ] ]
19
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1,225,023
1912.13128
Vasilis Oikonomou
Shin'ichi Nojiri, Sergei D. Odintsov, V.K. Oikonomou
Unifying Inflation with Early and Late-time Dark Energy in $F(R)$ Gravity
Revised Version, PDU Accepted
null
null
null
gr-qc astro-ph.CO hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we shall present models of $F(R)$ gravity which realize in a unified way the inflationary era along with a post-inflationary early dark energy era, with the late-time dark energy era. We shall use two approach methods in order to realize the unified cosmological eras, firstly we specify a Hubble rate which may describe the three distinct acceleration eras, and then by using well known $F(R)$ gravity reconstruction techniques, we shall find the differential equation which may yield the $F(R)$ gravity that realizes the cosmologies. In our second approach, we shall present in a qualitative way, several $F(R)$ gravities which unify the inflationary era with the early and late-time dark energy eras, and we discuss several qualitative issues related to the terms that realize the post-inflationary early dark energy era. We quantify our analysis by numerically solving the Friedmann equation, using the redshift as the main variable, and expressing all the physical quantities as functions of the statefinder $y_\mathrm{H}(z)$, which depends on the redshift and the Hubble rate $H(z)$. For the model studied numerically, we present the behavior of some statefinder quantities, like the deceleration parameter, and we calculate the dark energy density parameter and the dark energy equation of state parameter at present time. After demonstrating that the dark energy era is viable, we investigate when the early dark energy term does not affect the late-time era, and this restricts the free parameters of the model.
[ { "created": "Tue, 31 Dec 2019 00:50:46 GMT", "version": "v1" }, { "created": "Tue, 26 May 2020 15:52:50 GMT", "version": "v2" } ]
2020-05-27
[ [ "Nojiri", "Shin'ichi", "" ], [ "Odintsov", "Sergei D.", "" ], [ "Oikonomou", "V. K.", "" ] ]
19
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1,225,024
1912.13129
Yevgeny Stadnik
V. V. Flambaum, M. Pospelov, A. Ritz, Y. V. Stadnik
Sensitivity of EDM experiments in paramagnetic atoms and molecules to hadronic CP violation
7 pages, 3 figures, version accepted for publication in Physical Review D
Phys. Rev. D 102, 035001 (2020)
10.1103/PhysRevD.102.035001
null
hep-ph nucl-th physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Experiments searching for the electric dipole moment (EDM) of the electron $d_e$ utilise atomic/molecular states with one or more uncompensated electron spins, and these paramagnetic systems have recently achieved remarkable sensitivity to $d_e$. If the source of $CP$ violation resides entirely in the hadronic sector, the two-photon exchange processes between electrons and the nucleus induce $CP$-odd semileptonic interactions, parametrised by the Wilson coefficient $C_{SP}$, and provide the dominant source of EDMs in paramagnetic systems instead of $d_e$. We evaluate the $C_{SP}$ coefficients induced by the leading hadronic sources of $CP$ violation, namely nucleon EDMs and $CP$-odd pion-nucleon couplings, by calculating the nucleon-number-enhanced $CP$-odd nuclear scalar polarisability, employing chiral perturbation theory at the nucleon level and the Fermi-gas model for the nucleus. This allows us to translate the ACME EDM limits from paramagnetic ThO into novel independent constraints on the QCD theta term $|\bar \theta| < 3 \times 10^{-8}$, proton EDM $|d_p| < 2 \times 10^{-23}\,e\,{\rm cm}$, isoscalar $CP$-odd pion-nucleon coupling $|\bar g^{(1)}_{\pi NN}| < 4 \times 10^{-10}$, and colour EDMs of quarks $|\tilde d_u - \tilde d_d| < 2 \times 10^{-24}\,{\rm cm}$. We note that further experimental progress with EDM experiments in paramagnetic systems may allow them to rival the sensitivity of EDM experiments with neutrons and diamagnetic atoms to these quantities.
[ { "created": "Tue, 31 Dec 2019 00:52:10 GMT", "version": "v1" }, { "created": "Wed, 22 Apr 2020 09:30:39 GMT", "version": "v2" }, { "created": "Tue, 28 Jul 2020 03:45:37 GMT", "version": "v3" } ]
2020-08-12
[ [ "Flambaum", "V. V.", "" ], [ "Pospelov", "M.", "" ], [ "Ritz", "A.", "" ], [ "Stadnik", "Y. V.", "" ] ]
19
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1,225,025
1912.13130
Elizabeth Silber
Mihai L. Niculescu, Elizabeth A. Silber, Reynold E. Silber
Production of nitric oxide by a fragmenting bolide: An exploratory numerical study
30 pages, 9 figures
Mathematical Methods in Applied Sciences (2020)
10.1002/mma.6205
null
astro-ph.EP physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A meteoroid's hypersonic passage through the Earth's atmosphere results in ablational and fragmentational mass loss. Potential shock waves associated with a parent object as well as its fragments can modify the surrounding atmosphere and produce a range of physico-chemical effects. Some of the thermally driven chemical and physical processes induced by meteoroid-fragment generated shock waves, such as nitric oxide (NO) production, are less understood. Any estimates of meteoric NO production depend not only on a quantifiable meteoroid population and a rate of fragmentation, with a size capable of producing high temperature flows, but also on understanding the physical properties of the meteor flows along with their thermal history. We performed an exploratory pilot numerical study using ANSYS Fluent, the CFD code, to investigate the production of NO in the upper atmosphere by small meteoroids (or fragments of meteoroids after they undergo a disruption episode) in the size range from 1 cm m to 1 m. Our model uses the simulation of a spherical body in the continuum flow at 70 and 80 km altitude to approximate the behaviour of a small meteoroid capable of producing NO. The results presented in this exploratory study are in good agreement with previous studies.
[ { "created": "Tue, 31 Dec 2019 00:55:10 GMT", "version": "v1" }, { "created": "Sun, 5 Jan 2020 18:23:33 GMT", "version": "v2" } ]
2020-01-07
[ [ "Niculescu", "Mihai L.", "" ], [ "Silber", "Elizabeth A.", "" ], [ "Silber", "Reynold E.", "" ] ]
19
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1,225,026
1912.13131
David Hayes
D. Hayes, D. Stack, B. Bjork, A. C. Potter, C. H. Baldwin and R. P. Stutz
Eliminating Leakage Errors in Hyperfine Qubits
4 pages, 4 figures
Phys. Rev. Lett. 124, 170501 (2020)
10.1103/PhysRevLett.124.170501
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Population leakage outside the qubit subspace presents a particularly harmful source of error that cannot be handled by standard error correction methods. Using a trapped $^{171}$Yb$+$ ion, we demonstrate an optical pumping scheme to suppress leakage errors in atomic hyperfine qubits. The selection rules and narrow linewidth of a quadrupole transition are used to selectively pump population out of leakage states and back into the qubit subspace. Each pumping cycle reduces the leakage population by a factor of $\sim3$, allowing for an exponential suppression in the number of cycles. We use interleaved randomized benchmarking on the qubit subspace to show that this pumping procedure has negligible side-effects on un-leaked qubits, bounding the induced qubit memory error by $\leq2.0(8)\times10^{-5}$ per cycle, and qubit population decay to $\leq1.4(3)\times10^{-7}$ per cycle. These results clear a major obstacle for implementations of quantum error correction and error mitigation protocols.
[ { "created": "Tue, 31 Dec 2019 00:55:43 GMT", "version": "v1" }, { "created": "Sun, 3 May 2020 16:05:58 GMT", "version": "v2" } ]
2020-05-06
[ [ "Hayes", "D.", "" ], [ "Stack", "D.", "" ], [ "Bjork", "B.", "" ], [ "Potter", "A. C.", "" ], [ "Baldwin", "C. H.", "" ], [ "Stutz", "R. P.", "" ] ]
19
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1,225,027
1912.13132
Florian Gerber
Florian Gerber and Douglas W. Nychka
Parallel cross-validation: a scalable fitting method for Gaussian process models
11 pages, 6 Figs. Under review
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stat.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Gaussian process (GP) models are widely used to analyze spatially referenced data and to predict values at locations without observations. In contrast to many algorithmic procedures, GP models are based on a statistical framework, which enables uncertainty quantification of the model structure and predictions. Both the evaluation of the likelihood and the prediction involve solving linear systems. Hence, the computational costs are large and limit the amount of data that can be handled. While there are many approximation strategies that lower the computational cost of GP models, they often provide only sub-optimal support for the parallel computing capabilities of current (high-performance) computing environments. We aim at bridging this gap with a parameter estimation and prediction method that is designed to be parallelizable. More precisely, we divide the spatial domain into overlapping subsets and use cross-validation (CV) to estimate the covariance parameters in parallel. We present simulation studies, which assess the accuracy of the parameter estimates and predictions. Moreover, we show that our implementation has good weak and strong parallel scaling properties. For illustration, we fit an exponential covariance model to a scientifically relevant canopy height dataset with 5 million observations. Using 512 processor cores in parallel brings the evaluation time of one covariance parameter configuration to less than 1.5 minutes. The parallel CV method can be easily extended to include approximate likelihood methods, multivariate and spatio-temporal data, as well as non-stationary covariance models.
[ { "created": "Tue, 31 Dec 2019 00:57:43 GMT", "version": "v1" } ]
2020-01-01
[ [ "Gerber", "Florian", "" ], [ "Nychka", "Douglas W.", "" ] ]
19
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1,225,028
1912.13133
Lin He
Si-Yu Li, Yu Zhang, Ya-Ning Ren, Jianpeng Liu, Xi Dai, and Lin He
Experimental evidence for orbital magnetic moments generated by moir\'e-scale current loops in twisted bilayer graphene
4 figures in main text
Phys. Rev. B 102, 121406 (2020)
10.1103/PhysRevB.102.121406
null
cond-mat.mtrl-sci cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A remarkable property of twisted bilayer graphene (TBG) with small twist angle is the presence of a well-defined and conserved low-energy valley degrees of freedom1, which can potentially bring about new types of valley-associated spontaneous-symmetry breaking phases. Electron-electron (e-e) interactions in the TBG near the magic angle 1.1 degree can lift the valley degeneracy, allowing for the realization of orbital magnetism and topological phases2-11. However, direct measurement of the orbital-based magnetism in the TBG is still lacking up to now. Here we report evidence for orbital magnetic moment generated by the moire-scale current loops in a TBG with a twist angle {\theta} ~ 1.68 degree. The valley degeneracy of the 1.68 degree TBG is removed by e-e interactions when its low-energy van Hove singularity (VHS) is nearly half filled. A large and linear response of the valley splitting to magnetic fields is observed, attributing to coupling to the large orbital magnetic moment induced by chiral current loops circulating in the moire pattern. According to our experiment, the orbital magnetic moment is about 10.7 uB per moire supercell. Our result paves the way to explore magnetism that is purely orbital in slightly twisted graphene system.
[ { "created": "Tue, 31 Dec 2019 00:59:00 GMT", "version": "v1" } ]
2020-09-23
[ [ "Li", "Si-Yu", "" ], [ "Zhang", "Yu", "" ], [ "Ren", "Ya-Ning", "" ], [ "Liu", "Jianpeng", "" ], [ "Dai", "Xi", "" ], [ "He", "Lin", "" ] ]
19
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1,225,029
1912.13134
Jinwook Jung
Young-Pil Choi and Jinwook Jung
Asymptotic analysis for a Vlasov-Fokker-Planck/Navier-Stokes system in a bounded domain
null
null
null
null
math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study an asymptotic analysis of a coupled system of kinetic and fluid equations. More precisely, we deal with the nonlinear Vlasov-Fokker-Planck equation coupled with the compressible isentropic Navier-Stokes system through a drag force in a bounded domain with the specular reflection boundary condition for the kinetic equation and homogeneous Dirichlet boundary condition for the fluid system. We establish a rigorous hydrodynamic limit corresponding to strong noise and local alignment force. The limiting system is a type of two-phase fluid model consisting of the isothermal Euler system and the compressible Navier-Stokes system. Our main strategy relies on the relative entropy argument based on the weak-strong uniqueness principle. For this, we provide a global-in-time existence of weak solutions for the coupled kinetic-fluid system. We also show the existence and uniqueness of strong solutions to the limiting system in a bounded domain with the kinematic boundary condition for the Euler system and Dirichlet boundary condition for the Navier-Stokes system.
[ { "created": "Tue, 31 Dec 2019 01:02:25 GMT", "version": "v1" }, { "created": "Tue, 18 Feb 2020 07:30:23 GMT", "version": "v2" }, { "created": "Wed, 17 Jun 2020 00:45:53 GMT", "version": "v3" } ]
2020-06-18
[ [ "Choi", "Young-Pil", "" ], [ "Jung", "Jinwook", "" ] ]
19
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1,225,030
1912.13135
Carsten Rott
IceCube Collaboration: M. G. Aartsen, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, C. Alispach, K. Andeen, T. Anderson, I. Ansseau, G. Anton, C. Arg\"uelles, J. Auffenberg, S. Axani, P. Backes, H. Bagherpour, X. Bai, A. Balagopal V., A. Barbano, S. W. Barwick, B. Bastian, V. Baum, S. Baur, R. Bay, J. J. Beatty, K.-H. Becker, J. Becker Tjus, S. BenZvi, D. Berley, E. Bernardini, D. Z. Besson, G. Binder, D. Bindig, E. Blaufuss, S. Blot, C. Bohm, S. B\"oser, O. Botner, J. B\"ottcher, E. Bourbeau, J. Bourbeau, F. Bradascio, J. Braun, S. Bron, J. Brostean-Kaiser, A. Burgman, J. Buscher, R. S. Busse, T. Carver, C. Chen, E. Cheung, D. Chirkin, S. Choi, K. Clark, L. Classen, A. Coleman, G. H. Collin, J. M. Conrad, P. Coppin, P. Correa, D. F. Cowen, R. Cross, P. Dave, C. De Clercq, J. J. DeLaunay, H. Dembinski, K. Deoskar, S. De Ridder, P. Desiati, K. D. de Vries, G. de Wasseige, M. de With, T. DeYoung, A. Diaz, J. C. D\'iaz-V\'elez, H. Dujmovic, M. Dunkman, E. Dvorak, B. Eberhardt, T. Ehrhardt, P. Eller, R. Engel, P. A. Evenson, S. Fahey, A. R. Fazely, J. Felde, K. Filimonov, C. Finley, D. Fox, A. Franckowiak, E. Friedman, A. Fritz, T. K. Gaisser, J. Gallagher, E. Ganster, S. Garrappa, L. Gerhardt, K. Ghorbani, T. Glauch, T. Gl\"usenkamp, A. Goldschmidt, J. G. Gonzalez, D. Grant, T. Gr\'egoire, Z. Griffith, S. Griswold, M. G\"under, M. G\"und\"uz, C. Haack, A. Hallgren, R. Halliday, L. Halve, F. Halzen, K. Hanson, A. Haungs, D. Hebecker, D. Heereman, P. Heix, K. Helbing, R. Hellauer, F. Henningsen, S. Hickford, J. Hignight, G. C. Hill, K. D. Hoffman, R. Hoffmann, T. Hoinka, B. Hokanson-Fasig, K. Hoshina, F. Huang, M. Huber, T. Huber, K. Hultqvist, M. H\"unnefeld, R. Hussain, S. In, N. Iovine, A. Ishihara, M. Jansson, G. S. Japaridze, M. Jeong, K. Jero, B. J. P. Jones, F. Jonske, R. Joppe, D. Kang, W. Kang, A. Kappes, D. Kappesser, T. Karg, M. Karl, A. Karle, U. Katz, M. Kauer, J. L. Kelley, A. Kheirandish, J. Kim, T. Kintscher, J. Kiryluk, T. Kittler, S. R. Klein, R. Koirala, H. Kolanoski, L. K\"opke, C. Kopper, S. Kopper, D. J. Koskinen, M. Kowalski, K. Krings, G. Kr\"uckl, N. Kulacz, N. Kurahashi, A. Kyriacou, J. L. Lanfranchi, M. J. Larson, F. Lauber, J. P. Lazar, K. Leonard, A. Leszczy\'nska, M. Leuermann, Q. R. Liu, E. Lohfink, C. J. Lozano Mariscal, L. Lu, F. Lucarelli, J. L\"unemann, W. Luszczak, Y. Lyu, W. Y. Ma, J. Madsen, G. Maggi, K. B. M. Mahn, Y. Makino, P. Mallik, K. Mallot, S. Mancina, I. C. Mari\c{s}, R. Maruyama, K. Mase, R. Maunu, F. McNally, K. Meagher, M. Medici, A. Medina, M. Meier, S. Meighen-Berger, G. Merino, T. Meures, J. Micallef, D. Mockler, G. Moment\'e, T. Montaruli, R. W. Moore, R. Morse, M. Moulai, P. Muth, R. Nagai, U. Naumann, G. Neer, H. Niederhausen, M. U. Nisa, S. C. Nowicki, D. R. Nygren, A. Obertacke Pollmann, M. Oehler, A. Olivas, A. O'Murchadha, E. O'Sullivan, T. Palczewski, H. Pandya, D. V. Pankova, N. Park, P. Peiffer, C. P\'erez de los Heros, S. Philippen, D. Pieloth, S. Pieper, E. Pinat, A. Pizzuto, M. Plum, A. Porcelli, P. B. Price, G. T. Przybylski, C. Raab, A. Raissi, M. Rameez, L. Rauch, K. Rawlins, I. C. Rea, A. Rehman, R. Reimann, B. Relethford, M. Renschler, G. Renzi, E. Resconi, W. Rhode, M. Richman, S. Robertson, M. Rongen, C. Rott, T. Ruhe, D. Ryckbosch, D. Rysewyk, I. Safa, S. E. Sanchez Herrera, A. Sandrock, J. Sandroos, M. Santander, S. Sarkar, S. Sarkar, K. Satalecka, M. Schaufel, H. Schieler, P. Schlunder, T. Schmidt, A. Schneider, J. Schneider, F. G. Schr\"oder, L. Schumacher, S. Sclafani, D. Seckel, S. Seunarine, S. Shefali, M. Silva, R. Snihur, J. Soedingrekso, D. Soldin, M. Song, G. M. Spiczak, C. Spiering, J. Stachurska, M. Stamatikos, T. Stanev, R. Stein, J. Stettner, A. Steuer, T. Stezelberger, R. G. Stokstad, A. St\"o{\ss}l, N. L. Strotjohann, T. St\"urwald, T. Stuttard, G. W. Sullivan, I. Taboada, F. Tenholt, S. Ter-Antonyan, A. Terliuk, S. Tilav, K. Tollefson, L. Tomankova, C. T\"onnis, S. Toscano, D. Tosi, A. Trettin, M. Tselengidou, C. F. Tung, A. Turcati, R. Turcotte, C. F. Turley, B. Ty, E. Unger, M. A. Unland Elorrieta, M. Usner, J. Vandenbroucke, W. Van Driessche, D. van Eijk, N. van Eijndhoven, J. van Santen, S. Verpoest, M. Vraeghe, C. Walck, A. Wallace, M. Wallraff, N. Wandkowsky, T. B. Watson, C. Weaver, A. Weindl, M. J. Weiss, J. Weldert, C. Wendt, J. Werthebach, B. J. Whelan, N. Whitehorn, K. Wiebe, C. H. Wiebusch, L. Wille, D. R. Williams, L. Wills, M. Wolf, J. Wood, T. R. Wood, K. Woschnagg, G. Wrede, D. L. Xu, X. W. Xu, Y. Xu, J. P. Yanez, G. Yodh, S. Yoshida, T. Yuan, M. Z\"ocklein
Searches for neutrinos from cosmic-ray interactions in the Sun using seven years of IceCube data
25 pages, 8 figures
JCAP02(2021)025
10.1088/1475-7516/2021/02/025
null
astro-ph.HE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cosmic-ray interactions with the solar atmosphere are expected to produce particle showers which in turn produce neutrinos from weak decays of mesons. These solar atmospheric neutrinos (SA$\nu$s) have never been observed experimentally. A detection would be an important step in understanding cosmic-ray propagation in the inner solar system and the dynamics of solar magnetic fields. SA$\nu$s also represent an irreducible background to solar dark matter searches and a detection would allow precise characterization of this background. Here, we present the first experimental search based on seven years of data collected from May 2010 to May 2017 in the austral winter with the IceCube Neutrino Observatory. An unbinned likelihood analysis is performed for events reconstructed within 5 degrees of the center of the Sun. No evidence for a SA$\nu$ flux is observed. After inclusion of systematic uncertainties, we set a 90\% upper limit of $1.02^{+0.20}_{-0.18}\cdot10^{-13}$~$\mathrm{GeV^{-1}cm^{-2}s^{-1}}$ at 1 TeV.
[ { "created": "Tue, 31 Dec 2019 01:16:17 GMT", "version": "v1" }, { "created": "Tue, 23 Feb 2021 17:52:55 GMT", "version": "v2" } ]
2021-02-24
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19
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1,225,031
1912.13136
Taouba Jouini
Taouba Jouini, Zhiyong Sun
Fully decentralized conditions for local convergence of DC/AC converter network based on matching control
6 pages
null
null
null
math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate local convergence of identical DC/AC converters interconnected via identical resistive and inductive lines towards a synchronous equilibrium manifold. We exploit the symmetry of the resulting vector field and develop a Lyapunov-based framework, in which we measure the distance of the solutions of the nonlinear power system model to the equilibrium manifold by analyzing the evolution of their tangent vectors. We derive sufficient and fully decentralized conditions to characterize the equilibria of interest, and provide an estimate of their region of contraction. We provide ways to satisfy these conditions and illustrate our results based on numerical simulations of a two-converter benchmark.
[ { "created": "Tue, 31 Dec 2019 01:19:47 GMT", "version": "v1" }, { "created": "Thu, 23 Apr 2020 16:12:12 GMT", "version": "v2" }, { "created": "Mon, 27 Jul 2020 19:25:43 GMT", "version": "v3" } ]
2020-07-29
[ [ "Jouini", "Taouba", "" ], [ "Sun", "Zhiyong", "" ] ]
19
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1,225,032
1912.13137
Luis F. Abanto-Leon
Luis F. Abanto-Leon
Decentralized Subchannel Scheduling for C-V2X Mode-4: A Non-Standard Configuration for CAM Retransmissions
null
null
null
null
eess.SP cs.IT cs.SI math.IT
http://creativecommons.org/licenses/by/4.0/
In Release 14, 3GPP introduced a novel paradigm known as cellular vehicle--to--everything (C-V2X) \emph{mode-4} to specifically support vehicular communications in scenarios without network coverage. Such a scheme has been devised to operate distributedly harnessing a sensing mechanism whereby vehicles can monitor the received power across subchannels. Based on the measured power intensities, vehicles autonomously select a suitable subchannel over which safety messages are broadcasted. The selected subchannel is utilized by the vehicle for a short period of time before releasing it to select another subchannel. In this work, we propose a scheduling approach based on the aforementioned technology. We assume the existence of a primary sub-band that supports semi-persistently reserved subchannels (as specified by 3GPP). In addition, we also consider that there exist auxiliary sub-bands that convey random re-transmissions in order to improve reception reliability. Different configurations of the proposed approach are explored and their performance are assessed using real vehicular traces.
[ { "created": "Tue, 31 Dec 2019 01:40:45 GMT", "version": "v1" } ]
2020-01-01
[ [ "Abanto-Leon", "Luis F.", "" ] ]
19
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1,225,033
1912.13138
Brett Lopez
Brett T. Lopez and Jean-Jacques E. Slotine
Contraction Metrics in Adaptive Nonlinear Control
Added transient bounds for matched uncertainty and results with parameter bounds. Improved stability proof
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null
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eess.SY cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Lyapunov stability theory is the bedrock of direct adaptive control. Fundamentally, Lyapunov stability requires constructing a distance-like function which must decrease with time to ensure stability. Feedback linearization, backstepping, and sum-of-squares optimization are common approaches for constructing such a distance function, but require the system to possess certain inherent/structural properties or involves solving a non-convex optimization problem. These restrictions/complexities arise because Lyapunov stability theory relies on constructing an explicit distance function. This work uses contraction metrics to derive an adaptive controller for stabilizable nonlinear systems by constructing a distance-like function differentially rather than explicitly. Because stabilizability is in fact equivalent to the existence of a contraction metric, the proposed approach is significantly more general than available results in the literature. In particular, the method can be applied to underactuated systems. More broadly, it can also be used in transfer learning where a feedback controller has been carefully learned for a nominal system, but needs to remain effective in the presence of significant but structured variations in parameters. Simulation results illustrate the approach.
[ { "created": "Tue, 31 Dec 2019 01:49:06 GMT", "version": "v1" }, { "created": "Mon, 17 Feb 2020 06:18:14 GMT", "version": "v2" } ]
2020-02-18
[ [ "Lopez", "Brett T.", "" ], [ "Slotine", "Jean-Jacques E.", "" ] ]
19
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1,225,034
1912.13139
Yuwen Huang
Yuwen Huang, Yuan Liu and Fangjiong Chen
NOMA-Aided Mobile Edge Computing via User Cooperation
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Exploiting the idle computation resources of mobile devices in mobile edge computing (MEC) system can achieve both channel diversity and computing diversity as mobile devices can offload their computation tasks to nearby mobile devices in addition to MEC server embedded access point (AP). In this paper, we propose a non-orthogonal multiple-access (NOMA)-aided cooperative computing scheme in a basic three-node MEC system consisting of a user, a helper, and an AP. In particular, we assume that the user can simultaneously offload data to the helper and the AP using NOMA, while the helper can locally compute data and offload data to the AP at the same time. We study two optimization problems, energy consumption minimization and offloading data maximization, by joint communication and computation resource allocation of the user and helper. We find the optimal solutions for the two non-convex problems by some proper mathematical methods. Simulation results are presented to demonstrate the effectiveness of the proposed schemes. Some useful insights are provided for practical designs.
[ { "created": "Tue, 31 Dec 2019 01:51:32 GMT", "version": "v1" } ]
2020-01-01
[ [ "Huang", "Yuwen", "" ], [ "Liu", "Yuan", "" ], [ "Chen", "Fangjiong", "" ] ]
19
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1,225,035
1912.13140
Jianhui Nie
Jianhui Nie, Wenkai Shi, Ye Liu, Hao Gao, Feng Xu, Zhaochen Zhang, Guoping Jiang
Bas-relief Generation from Point Clouds Based on Normal Space Compression with Real-time Adjustment on CPU
null
null
null
null
cs.GR cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bas-relief generation based on 3d models is a hot topic in computer graphics. State-of-the-art algorithms take a mesh surface as input, but real-time interaction via CPU cannot be realized. In this paper, a bas-relief generation algorithm that takes a scattered point cloud as input is proposed. The algorithm takes normal vectors as the operation object and the variation of the local surface as the compression criterion. By constructing and solving linear equations of bas-relief vertices, the closed-form solution can be obtained. Since there is no need to compute discrete gradients on a point cloud lacking topology information, it is easier to implement and more intuitive than gradient domain methods. The algorithm provides parameters to adjust the bas-relief height, saturation and detail richness. At the same time, through the solution strategy based on the subspace, it realizes the real-time adjustment of the bas-relief effect based on the computing power of a consumer CPU. In addition, an iterative solution to generate a bas-relief model of a specified height is presented to meet specific application requirements. Experiments show that our algorithm provides a unified solution for various types of bas-relief creation and can generate bas-reliefs with good saturation and rich details.
[ { "created": "Tue, 31 Dec 2019 01:54:13 GMT", "version": "v1" } ]
2020-01-01
[ [ "Nie", "Jianhui", "" ], [ "Shi", "Wenkai", "" ], [ "Liu", "Ye", "" ], [ "Gao", "Hao", "" ], [ "Xu", "Feng", "" ], [ "Zhang", "Zhaochen", "" ], [ "Jiang", "Guoping", "" ] ]
19
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1,225,036
1912.13141
Thuan Nguyen
Thuan Nguyen and Thinh Nguyen
Minimizing Impurity Partition Under Constraints
null
null
null
null
cs.IT cs.IR eess.SP math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Set partitioning is a key component of many algorithms in machine learning, signal processing, and communications. In general, the problem of finding a partition that minimizes a given impurity (loss function) is NP-hard. As such, there exists a wealth of literature on approximate algorithms and theoretical analyses of the partitioning problem under different settings. In this paper, we formulate and solve a variant of the partition problem called the minimum impurity partition under constraint (MIPUC). MIPUC finds an optimal partition that minimizes a given loss function under a given concave constraint. MIPUC generalizes the recently proposed deterministic information bottleneck problem which finds an optimal partition that maximizes the mutual information between the input and partition output while minimizing the partition output entropy. Our proposed algorithm is developed based on a novel optimality condition, which allows us to find a locally optimal solution efficiently. Moreover, we show that the optimal partition produces a hard partition that is equivalent to the cuts by hyperplanes in the probability space of the posterior probability that finally yields a polynomial time complexity algorithm to find the globally optimal partition. Both theoretical and numerical results are provided to validate the proposed algorithm.
[ { "created": "Tue, 31 Dec 2019 01:55:41 GMT", "version": "v1" } ]
2020-01-01
[ [ "Nguyen", "Thuan", "" ], [ "Nguyen", "Thinh", "" ] ]
19
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-0.39590585231781006, 0.4338963031768799, -0.015998532995581627, -0.0901903584599495 ]
1,225,037
1912.13142
Jos\'e Antonio M. Vilhena
Jos\'E Antonio M. Vilhena
An example of a minimal surface of genus one with two catenoid ends and one Enneper end
15 pages, 8 figures
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we construct an example of a complete immersed minimal surface in $\mathbb{R}^3$ of genus one with two embedded catenoid-type ends, one Enneper-type end and total Gauss curvature $-16\pi.$ The proof of the existence of this example, was obtained using the Weierstrass representation, the theory of elliptic functions and explicitly solving the period problem.
[ { "created": "Tue, 31 Dec 2019 02:01:12 GMT", "version": "v1" } ]
2020-01-01
[ [ "Vilhena", "JosÉ Antonio M.", "" ] ]
19
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1,225,038
1912.13143
Jack Umenberger
Jack Umenberger and Thomas B. Schon
Optimistic robust linear quadratic dual control
Preprint submitted to L4DC 2020. 11 pages. 1 figure
null
null
null
math.OC cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent work by Mania et al. has proved that certainty equivalent control achieves nearly optimal regret for linear systems with quadratic costs. However, when parameter uncertainty is large, certainty equivalence cannot be relied upon to stabilize the true, unknown system. In this paper, we present a dual control strategy that attempts to combine the performance of certainty equivalence, with the practical utility of robustness. The formulation preserves structure in the representation of parametric uncertainty, which allows the controller to target reduction of uncertainty in the parameters that `matter most' for the control task, while robustly stabilizing the uncertain system. Control synthesis proceeds via convex optimization, and the method is illustrated on a numerical example.
[ { "created": "Tue, 31 Dec 2019 02:02:11 GMT", "version": "v1" } ]
2020-01-01
[ [ "Umenberger", "Jack", "" ], [ "Schon", "Thomas B.", "" ] ]
19
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1,225,039
1912.13144
Carter Butts
Carter T. Butts
A Dynamic Process Reference Model for Sparse Networks with Reciprocity
null
null
null
null
stat.ME cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many social and other networks exhibit stable size scaling relationships, such that features such as mean degree or reciprocation rates change slowly or are approximately constant as the number of vertices increases. Statistical network models built on top of simple Bernoulli baseline (or reference) measures often behave unrealistically in this respect, leading to the development of sparse reference models that preserve features such as mean degree scaling. In this paper, we generalize recent work on the micro-foundations of such reference models to the case of sparse directed graphs with non-vanishing reciprocity, providing a dynamic process interpretation of the emergence of stable macroscopic behavior.
[ { "created": "Tue, 31 Dec 2019 02:07:08 GMT", "version": "v1" } ]
2020-01-01
[ [ "Butts", "Carter T.", "" ] ]
19
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1,225,040
1912.13145
Ryosuke Takahashi
Ryosuke Takahashi
Collapsing of the line bundle mean curvature flow on K\"ahler surfaces
19 pages, final version, to appear in Calc. Var. Partial Differential Equations
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the line bundle mean curvature flow on K\"ahler surfaces under the hypercritical phase and a certain semipositivity condition. We naturally encounter such a condition when considering the blowup of K\"ahler surfaces. We show that the flow converges smoothly to a singular solution to the deformed Hermitian-Yang-Mills equation away from a finite number of curves of negative self-intersection on the surface. As an application, we obtain a lower bound of a Kempf-Ness type functional on the space of potential functions satisfying the hypercritical phase condition.
[ { "created": "Tue, 31 Dec 2019 02:09:21 GMT", "version": "v1" }, { "created": "Mon, 20 Jan 2020 08:33:16 GMT", "version": "v2" }, { "created": "Mon, 27 Jan 2020 14:27:14 GMT", "version": "v3" }, { "created": "Thu, 7 Jan 2021 06:10:52 GMT", "version": "v4" } ]
2021-01-08
[ [ "Takahashi", "Ryosuke", "" ] ]
19
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1,225,041
1912.13146
Kazuhiro Seki
Kazuhiro Seki, Tomonori Shirakawa, Seiji Yunoki
Symmetry-adapted variational quantum eigensolver
15 pages, 13 figures, 1 table
Phys. Rev. A 101, 052340 (2020)
10.1103/PhysRevA.101.052340
null
quant-ph cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a scheme to restore spatial symmetry of Hamiltonian in the variational-quantum-eigensolver (VQE) algorithm for which the quantum circuit structures used usually break the Hamiltonian symmetry. The symmetry-adapted VQE scheme introduced here simply applies the projection operator, which is Hermitian but not unitary, to restore the spatial symmetry in a desired irreducible representation of the spatial group. The entanglement of a quantum state is still represented in a quantum circuit but the nonunitarity of the projection operator is treated classically as postprocessing in the VQE framework. By numerical simulations for a spin-$1/2$ Heisenberg model on a one-dimensional ring, we demonstrate that the symmetry-adapted VQE scheme with a shallower quantum circuit can achieve significant improvement in terms of the fidelity of the ground state and has a great advantage in terms of the ground-state energy with decent accuracy, as compared to the non-symmetry-adapted VQE scheme. We also demonstrate that the present scheme can approximate low-lying excited states that can be specified by symmetry sectors, using the same circuit structure for the ground-state calculation.
[ { "created": "Tue, 31 Dec 2019 02:13:11 GMT", "version": "v1" }, { "created": "Fri, 29 May 2020 08:13:41 GMT", "version": "v2" } ]
2020-06-01
[ [ "Seki", "Kazuhiro", "" ], [ "Shirakawa", "Tomonori", "" ], [ "Yunoki", "Seiji", "" ] ]
19
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1,225,042
1912.13147
Ping Li
Ping Li
On some applications of Gauduchon metrics
13 pages, comments welcome
Geometriae Dedicata (2021)
10.1007/s10711-020-00592-w
null
math.DG math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We apply the existence and special properties of Gauduchon metrics to give several applications. The first one is concerned with the implications of algebro-geometric nature under the existence of a Hermitian metric with nonnegative holomorphic sectional curvature. The second one is to show the non-existence of holomorphic sections on Hermitian vector bundles under certain conditions. The third one is to give a restriction on the $\partial\bar{\partial}$-closedness of some real $(n-1,n-1)$-forms on compact complex manifolds.
[ { "created": "Tue, 31 Dec 2019 02:21:52 GMT", "version": "v1" } ]
2022-05-11
[ [ "Li", "Ping", "" ] ]
19
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1,225,043
1912.13148
Lennaert van Veen
Lennaert van Veen, Jacob Morra, Adam Palanica and Yan Fossat
I'm a doctor, not a mathematician! Homeostasis as a proportional-integral control system
null
null
null
null
physics.med-ph q-bio.TO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The distinction between "healthy" and "unhealthy" patients is commonly based on single, discrete values taken at an isolated point in time (e.g., blood pressure or core temperature). Perhaps a more robust and insightful diagnosis can be obtained by studying the functional interdependence of such indicators and the homeostasis that controls them. This requires quasi-continuous measurements and a procedure to map the data onto a parsimonious control model with a degree of universality. The current research illustrates this approach using glucose homeostasis as a target. Data were obtained from 41 healthy subjects wearing over-the-counter glucose monitors, and projected onto a simple proportional-integral (PI) controller, widely used in engineering applications. The indicators quantifying the control function are clustered for the great majority of subjects, while a few outliers exhibit less efficient homeostasis. Practical implications for healthcare and education are further discussed.
[ { "created": "Tue, 31 Dec 2019 02:33:43 GMT", "version": "v1" } ]
2020-01-01
[ [ "van Veen", "Lennaert", "" ], [ "Morra", "Jacob", "" ], [ "Palanica", "Adam", "" ], [ "Fossat", "Yan", "" ] ]
19
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1,225,044
1912.13149
Badri Narayana Patro
Badri N. Patro, Dev Chauhan, Vinod K. Kurmi, Vinay P. Namboodiri
Revisiting Paraphrase Question Generator using Pairwise Discriminator
This work is an extension of our COLING-2018 paper arXiv:1806.00807
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null
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cs.CL cs.LG
http://creativecommons.org/licenses/by-nc-sa/4.0/
In this paper, we propose a method for obtaining sentence-level embeddings. While the problem of securing word-level embeddings is very well studied, we propose a novel method for obtaining sentence-level embeddings. This is obtained by a simple method in the context of solving the paraphrase generation task. If we use a sequential encoder-decoder model for generating paraphrase, we would like the generated paraphrase to be semantically close to the original sentence. One way to ensure this is by adding constraints for true paraphrase embeddings to be close and unrelated paraphrase candidate sentence embeddings to be far. This is ensured by using a sequential pair-wise discriminator that shares weights with the encoder that is trained with a suitable loss function. Our loss function penalizes paraphrase sentence embedding distances from being too large. This loss is used in combination with a sequential encoder-decoder network. We also validated our method by evaluating the obtained embeddings for a sentiment analysis task. The proposed method results in semantic embeddings and outperforms the state-of-the-art on the paraphrase generation and sentiment analysis task on standard datasets. These results are also shown to be statistically significant.
[ { "created": "Tue, 31 Dec 2019 02:46:29 GMT", "version": "v1" }, { "created": "Sat, 4 Jan 2020 14:06:19 GMT", "version": "v2" } ]
2020-01-07
[ [ "Patro", "Badri N.", "" ], [ "Chauhan", "Dev", "" ], [ "Kurmi", "Vinod K.", "" ], [ "Namboodiri", "Vinay P.", "" ] ]
19
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1,225,045
1912.13150
Robert D. Mawhinney
Robert D. Mawhinney
2+1 Flavor Domain Wall Fermion QCD Lattices: Ensemble Production and (some) Properties
7 pages
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null
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hep-lat
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The RBC and UKQCD Collaborations continue to produce 2+1 flavor domain wall fermion ensembles, currently focusing on an ensemble with a $96^3 \times 192$ volume on SUMMIT at ORNL with $1/a \approx 2.8$ GeV, and smaller ensembles at stronger couplings. The $1/a \approx 2.8$ GeV ensemble uses the Exact One Flavor Algorithm for the strange quark, along with the Multisplitting Preconditioned Conjugate Gradient for solving the Dirac equation. We report on our progress and experience to date with the evolution of this ensemble.
[ { "created": "Tue, 31 Dec 2019 02:52:58 GMT", "version": "v1" } ]
2020-01-01
[ [ "Mawhinney", "Robert D.", "" ] ]
19
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1,225,046
1912.13151
Mingyuan Zhou
Xinjie Fan, Yizhe Zhang, Zhendong Wang, Mingyuan Zhou
Adaptive Correlated Monte Carlo for Contextual Categorical Sequence Generation
ICLR 2020 (updated to fix a typo in Algorithm 1)
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Sequence generation models are commonly refined with reinforcement learning over user-defined metrics. However, high gradient variance hinders the practical use of this method. To stabilize this method, we adapt to contextual generation of categorical sequences a policy gradient estimator, which evaluates a set of correlated Monte Carlo (MC) rollouts for variance control. Due to the correlation, the number of unique rollouts is random and adaptive to model uncertainty; those rollouts naturally become baselines for each other, and hence are combined to effectively reduce gradient variance. We also demonstrate the use of correlated MC rollouts for binary-tree softmax models, which reduce the high generation cost in large vocabulary scenarios by decomposing each categorical action into a sequence of binary actions. We evaluate our methods on both neural program synthesis and image captioning. The proposed methods yield lower gradient variance and consistent improvement over related baselines.
[ { "created": "Tue, 31 Dec 2019 03:01:55 GMT", "version": "v1" }, { "created": "Wed, 17 Jun 2020 16:32:42 GMT", "version": "v2" } ]
2020-06-18
[ [ "Fan", "Xinjie", "" ], [ "Zhang", "Yizhe", "" ], [ "Wang", "Zhendong", "" ], [ "Zhou", "Mingyuan", "" ] ]
19
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1,225,047
1912.13152
Feng Zhu
Feng Zhu
Relatively dominated representations
Typos corrected. 48 pages, 2 figures. Comments welcome!
null
null
null
math.GR math.GT math.MG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Anosov representations give a higher-rank analogue of convex cocompactness in a rank-one Lie group which shares many of its good geometric and dynamical properties; geometric finiteness in rank one may be seen as a controlled weakening of convex cocompactness to allow for isolated failures of hyperbolicity. We introduce relatively dominated representations as a relativization of Anosov representations, or in other words a higher-rank analogue of geometric finiteness. We prove that groups admitting relatively dominated representations must be relatively hyperbolic, that these representations induce limit maps with good properties, provide examples, and draw connections to work of Kapovich--Leeb which also introduces higher-rank analogues of geometric finiteness.
[ { "created": "Tue, 31 Dec 2019 03:03:15 GMT", "version": "v1" }, { "created": "Fri, 27 Mar 2020 15:44:42 GMT", "version": "v2" } ]
2020-03-30
[ [ "Zhu", "Feng", "" ] ]
19
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1,225,048
1912.13153
Rong Ma
Rong Ma, Yana Niu
On the mean value of the generalized Dirichlet L-functions with the weight of the Gauss Sums
14 pages
null
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $q\ge3$ be an integer, $\chi$ denote a Dirichlet character modulo $q$, for any real number $a\ge 0$, we define the generalized Dirichlet $L$-functions $$ L(s,\chi,a)=\sum_{n=1}^{\infty}\frac{\chi(n)}{(n+a)^s}, $$ where $s=\sigma+it$ with $\sigma>1$ and $t$ both real. It can be extended to all $s$ by analytic continuation. For any integer $m$, the famous Gauss sum $G(m,\chi)$ is defined as follows: $$G(m,\chi)=\sum_{a=1}^{q}\chi(a)e\left(\frac{am}{q}\right), $$ where $e(y)=e^{2\pi iy}$. The main purpose of this paper is to use the analytic method to study the mean value properties of the generalized Dirichlet $L$-functions with the weight of the Gauss Sums, and obtain a sharp asymptotic formula.
[ { "created": "Tue, 31 Dec 2019 03:13:09 GMT", "version": "v1" } ]
2020-01-01
[ [ "Ma", "Rong", "" ], [ "Niu", "Yana", "" ] ]
19
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1,225,049
1912.13154
Nicholas Boffi
Nicholas M. Boffi, Jean-Jacques E. Slotine
Implicit Regularization and Momentum Algorithms in Nonlinearly Parameterized Adaptive Control and Prediction
sync title and abstract with journal version, minor cosmetic re-arrangements to text
Neural Computation (2021) 33 (3): 590-673
10.1162/neco_a_01360
null
math.OC cs.LG
http://creativecommons.org/licenses/by/4.0/
Stable concurrent learning and control of dynamical systems is the subject of adaptive control. Despite being an established field with many practical applications and a rich theory, much of the development in adaptive control for nonlinear systems revolves around a few key algorithms. By exploiting strong connections between classical adaptive nonlinear control techniques and recent progress in optimization and machine learning, we show that there exists considerable untapped potential in algorithm development for both adaptive nonlinear control and adaptive dynamics prediction. We begin by introducing first-order adaptation laws inspired by natural gradient descent and mirror descent. We prove that when there are multiple dynamics consistent with the data, these non-Euclidean adaptation laws implicitly regularize the learned model. Local geometry imposed during learning thus may be used to select parameter vectors -- out of the many that will achieve perfect tracking or prediction -- for desired properties such as sparsity. We apply this result to regularized dynamics predictor and observer design, and as concrete examples, we consider Hamiltonian systems, Lagrangian systems, and recurrent neural networks. We subsequently develop a variational formalism based on the Bregman Lagrangian. We show that its Euler Lagrange equations lead to natural gradient and mirror descent-like adaptation laws with momentum, and we recover their first-order analogues in the infinite friction limit. We illustrate our analyses with simulations demonstrating our theoretical results.
[ { "created": "Tue, 31 Dec 2019 03:13:25 GMT", "version": "v1" }, { "created": "Thu, 20 Feb 2020 18:59:10 GMT", "version": "v2" }, { "created": "Wed, 11 Mar 2020 15:28:38 GMT", "version": "v3" }, { "created": "Mon, 15 Jun 2020 14:55:17 GMT", "version": "v4" }, { "created": "Fri, 2 Oct 2020 22:45:50 GMT", "version": "v5" }, { "created": "Thu, 17 Dec 2020 17:51:02 GMT", "version": "v6" }, { "created": "Fri, 29 Sep 2023 22:01:57 GMT", "version": "v7" } ]
2023-10-03
[ [ "Boffi", "Nicholas M.", "" ], [ "Slotine", "Jean-Jacques E.", "" ] ]
19
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1,225,050
1912.13155
Bogdan A. Dobrescu
Bogdan A. Dobrescu
LHC probes of the 10 TeV scale
19 pages, 4 figures
null
null
Fermilab-PUB-19-643-T
hep-ph hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The usual range of new particle masses, up to a few TeV, searched for at the LHC may be substantially extended if ultraheavy diquark particles exist. A diquark scalar, $S_{uu}$, that interacts perturbatively with two up quarks may be as heavy as 10 TeV and would still produce tens of spectacular events at the 14 TeV LHC. It is shown here that an ultraheavy $S_{uu}$ could be discovered through final states of very high energy in various channels, especially if the diquark can decay into other new heavy particles. Examples include cascade decays of $S_{uu}$ via a second scalar produced in pairs, which leads to two dijet resonances, or to more exotic signals with top quarks, Higgs bosons, electroweak bosons, and high-$p_T$ jets. Another possibility is that the diquark decays into a vectorlike quark of multi-TeV mass and a top or up quark. Signal events include one or two highly boosted top quarks and a Higgs boson or a $Z$, without counterparts containing top antiquarks. Similarly, direct decays of the diquark into $tj$ or $tt$ with leptonic top decays involve only positively charged leptons.
[ { "created": "Tue, 31 Dec 2019 03:18:03 GMT", "version": "v1" } ]
2020-01-01
[ [ "Dobrescu", "Bogdan A.", "" ] ]
19
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-0.3865659534931183 ]
1,225,051
1912.13156
Dingju Zhu
Dingju Zhu
Hiding Information in Big Data based on Deep Learning
null
null
null
null
cs.CR cs.LG cs.MM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The current approach of information hiding based on deep learning model can not directly use the original data as carriers, which means the approach can not make use of the existing data in big data to hiding information. We proposed a novel method of information hiding in big data based on deep learning. Our method uses the existing data in big data as carriers and uses deep learning models to hide and extract secret messages in big data. The data amount of big data is unlimited and thus the data amount of secret messages hided in big data can also be unlimited. Before opponents want to extract secret messages from carriers, they need to find the carriers, however finding out the carriers from big data is just like finding out a box from the sea. Deep learning models are well known as deep black boxes in which the process from the input to the output is very complex, and thus the deep learning model for information hiding is almost impossible for opponents to reconstruct. The results also show that our method can hide secret messages safely, conveniently, quickly and with no limitation on the data amount.
[ { "created": "Tue, 31 Dec 2019 03:23:54 GMT", "version": "v1" }, { "created": "Thu, 23 Jan 2020 10:32:24 GMT", "version": "v2" } ]
2020-01-24
[ [ "Zhu", "Dingju", "" ] ]
19
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1,225,052
1912.13157
Ehsan Khodabandeh
Ehsan Khodabandeh, Lawrence V. Snyder, John Dennis, Joshua Hammond, Cody Wanless
C. H. Robinson Uses Heuristics to Solve Rich Vehicle Routing Problems
12 pages, 3 figures, and 3 tables
null
null
null
cs.AI math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a wide family of vehicle routing problem variants with many complex and practical constraints, known as rich vehicle routing problems, which are faced on a daily basis by C.H. Robinson (CHR). Since CHR has many customers, each with distinct requirements, various routing problems with different objectives and constraints should be solved. We propose a set partitioning framework with a number of route generation algorithms, which have shown to be effective in solving a variety of different problems. The proposed algorithms have outperformed the existing technologies at CHR on 10 benchmark instances and since, have been embedded into the company's transportation planning and execution technology platform.
[ { "created": "Tue, 31 Dec 2019 03:24:46 GMT", "version": "v1" } ]
2020-01-01
[ [ "Khodabandeh", "Ehsan", "" ], [ "Snyder", "Lawrence V.", "" ], [ "Dennis", "John", "" ], [ "Hammond", "Joshua", "" ], [ "Wanless", "Cody", "" ] ]
19
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1,225,053
1912.13158
Friedrich Herrmann
Friedrich Herrmann and Tobias Vorbach
The geodynamo for non-geophysicists
null
null
10.1088/1361-6404/ab8780
null
physics.pop-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The geodynamo usually appears as a somewhat intimidating subject. Its understanding seems to require the intricate theory of magnetohydrodynamics. The solution of the corresponding equations can only be achieved numerically. It seems to be a subject for the specialist. We show that one can understand the basics of the functioning of the geodynamo solely by using the well-known laws of electrodynamics. The topic is not only important for geophysicists. The same physics is the cause for the magnetic fields of sun-like stars, of the very strong fields of neutron stars, and also of the cosmic magnetic fields.
[ { "created": "Fri, 27 Dec 2019 13:07:06 GMT", "version": "v1" } ]
2020-09-30
[ [ "Herrmann", "Friedrich", "" ], [ "Vorbach", "Tobias", "" ] ]
19
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1,225,054
1912.13159
John Rock
John A. Rock
Arbitrarily Close
219 pages, approximately 100 figures
null
null
null
math.HO
http://creativecommons.org/licenses/by-sa/4.0/
Mathematicians tend to use the phrase "arbitrarily close" to mean something along the lines of "every neighborhood of a point intersects a set". Taking the latter statement as a technical definition for arbitrarily close leads to an alternative development of classic concepts in real analysis such as supremum, closure, convergence and limits of sequences, closure, connectedness, compactness, and continuity. The goal of this text is to provide readers with an introduction to real analysis by taking deliberate steps to parse these difficult concepts using arbitrarily close as the kernel.
[ { "created": "Tue, 17 Dec 2019 20:23:34 GMT", "version": "v1" }, { "created": "Wed, 10 Aug 2022 01:01:39 GMT", "version": "v2" } ]
2022-08-11
[ [ "Rock", "John A.", "" ] ]
19
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1,225,055
1912.13160
Kenichi Shimizu
Kenichi Shimizu (Shibaura Institute of Technology)
Tannaka theory and the FRT construction over non-commutative algebras
v2, 56 pages, 118 picture files. Fully revised. The invertibility of the lax braiding of FRT bialgebroids is discussed. A relation to Hayashi's construction of face algebras is added
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null
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math.QA math.CT math.RA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $A$ be an algebra over a commutative ring $k$. We introduce the notion of a coquasitriangular left bialgebroid over $A$ and show that the category of left comodules over such a bialgebroid has a braiding. We also investigate a Tannaka type construction of bimonads and bialgebroids. As an application, the Faddeev-Reshetikhin-Takhtajan (FRT) construction over the algebra $A$ is established. Our construction associates a coquasitriangular bialgebroid to a braided object $(M, c)$ in the category of $A$-bimodules such that $M$ is finitely generated and projective as a left $A$-module. A Hopf algebroid version of this construction is also provided.
[ { "created": "Tue, 31 Dec 2019 03:36:50 GMT", "version": "v1" }, { "created": "Mon, 5 Jul 2021 10:30:01 GMT", "version": "v2" } ]
2021-07-06
[ [ "Shimizu", "Kenichi", "", "Shibaura Institute of Technology" ] ]
19
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1,225,056
1912.13161
Ibrahim Gashaw
Ibrahim Gashaw and H L Shashirekha
Amharic-Arabic Neural Machine Translation
15 pages
null
null
null
cs.CL cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many automatic translation works have been addressed between major European language pairs, by taking advantage of large scale parallel corpora, but very few research works are conducted on the Amharic-Arabic language pair due to its parallel data scarcity. Two Long Short-Term Memory (LSTM) and Gated Recurrent Units (GRU) based Neural Machine Translation (NMT) models are developed using Attention-based Encoder-Decoder architecture which is adapted from the open-source OpenNMT system. In order to perform the experiment, a small parallel Quranic text corpus is constructed by modifying the existing monolingual Arabic text and its equivalent translation of Amharic language text corpora available on Tanzile. LSTM and GRU based NMT models and Google Translation system are compared and found that LSTM based OpenNMT outperforms GRU based OpenNMT and Google Translation system, with a BLEU score of 12%, 11%, and 6% respectively.
[ { "created": "Thu, 26 Dec 2019 15:41:35 GMT", "version": "v1" } ]
2020-01-01
[ [ "Gashaw", "Ibrahim", "" ], [ "Shashirekha", "H L", "" ] ]
19
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1,225,057
1912.13162
Andrey Radzhabov E
D. Blaschke, A. Friesen, Yu. Kalinovsky and A. Radzhabov
Using the Beth-Uhlenbeck approach to describe the kaon to pion ratio in a 2+1 flavor PNJL model
8 pages, 4 figures, Talk at the II International Workshop on Theory of Hadronic Matter Under Extreme Conditions
Particles 3 (1), 169-177 (2020)
10.3390/particles3010014
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The kaon to pion ratios are discussed in the framework of a 2+1 flavor PNJL model. In order to interpret the behaviour of bound states in medium the Beth-Uhlenbeck approach is used. It is shown that in terms of phase shifts in the K+ channel an additional low-energy mode could appear as a bound state in medium since the masses of the quark constituents are different. The comparison with experimental data for the ratios is performed and the influence of the anomalous mode to the "horn" effect in the K+/pi+ ratio is discussed.
[ { "created": "Tue, 31 Dec 2019 03:48:29 GMT", "version": "v1" } ]
2020-03-19
[ [ "Blaschke", "D.", "" ], [ "Friesen", "A.", "" ], [ "Kalinovsky", "Yu.", "" ], [ "Radzhabov", "A.", "" ] ]
19
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1,225,058
1912.13163
Stefano Savazzi
Stefano Savazzi, Monica Nicoli, Vittorio Rampa
Federated Learning with Cooperating Devices: A Consensus Approach for Massive IoT Networks
This work received support from the CHIST-ERA III Grant RadioSense (Big Data and Process Modelling for the Smart Industry - BDSI). The paper has been accepted for publication in the IEEE Internet of Things Journal. The current arXiv contains an additional Appendix C that describes the database and the Python scripts. Published version: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8950073&isnumber=6702522
IEEE Internet of Things Journal, vol. 7, no. 5, pp. 4641-4654, May 2020
10.1109/JIOT.2020.2964162
null
eess.SP cs.DC cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Federated learning (FL) is emerging as a new paradigm to train machine learning models in distributed systems. Rather than sharing, and disclosing, the training dataset with the server, the model parameters (e.g. neural networks weights and biases) are optimized collectively by large populations of interconnected devices, acting as local learners. FL can be applied to power-constrained IoT devices with slow and sporadic connections. In addition, it does not need data to be exported to third parties, preserving privacy. Despite these benefits, a main limit of existing approaches is the centralized optimization which relies on a server for aggregation and fusion of local parameters; this has the drawback of a single point of failure and scaling issues for increasing network size. The paper proposes a fully distributed (or server-less) learning approach: the proposed FL algorithms leverage the cooperation of devices that perform data operations inside the network by iterating local computations and mutual interactions via consensus-based methods. The approach lays the groundwork for integration of FL within 5G and beyond networks characterized by decentralized connectivity and computing, with intelligence distributed over the end-devices. The proposed methodology is verified by experimental datasets collected inside an industrial IoT environment.
[ { "created": "Fri, 27 Dec 2019 15:16:04 GMT", "version": "v1" } ]
2020-05-27
[ [ "Savazzi", "Stefano", "" ], [ "Nicoli", "Monica", "" ], [ "Rampa", "Vittorio", "" ] ]
19
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1,225,059
1912.13164
Neeti Keswani
N. Keswani, Y. Nakajima, N. Chauhan, H. Chakraborti, K. Dasgupta, S. Kumar, Y. Ohno, H. Ohno and P. Das
Magnetization reversal of dipolar coupled nanomagnets studied by two-dimensional electron gas based micro-Hall magnetometry
5 pages, 4 figures
Appl. Phys. Lett. 116, 102401 (2020)
10.1063/1.5144841
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report here the results of two-dimensional electron gas based micro-Hall magnetometry measurements and micromagnetic simulations of dipolar coupled nanomagnets of Ni80Fe20 arranged in a double ring-like geometry. We observe that although magnetic force microscopy images exhibit single domain like magnetic states for the nanostructures, their reversal processes may undergo complex behavior. The details of such reversal behavior is observed as specific features in micro-Hall magnetometry data which compares well with the micromagnetic simulation data.
[ { "created": "Tue, 31 Dec 2019 03:57:05 GMT", "version": "v1" } ]
2020-03-12
[ [ "Keswani", "N.", "" ], [ "Nakajima", "Y.", "" ], [ "Chauhan", "N.", "" ], [ "Chakraborti", "H.", "" ], [ "Dasgupta", "K.", "" ], [ "Kumar", "S.", "" ], [ "Ohno", "Y.", "" ], [ "Ohno", "H.", "" ], [ "Das", "P.", "" ] ]
19
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1,225,060
1912.13165
Walaa Moursi M
Pontus Giselsson and Walaa M. Moursi
On compositions of special cases of Lipschitz continuous operators
null
null
null
null
math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many iterative optimization algorithms involve compositions of special cases of Lipschitz continuous operators, namely firmly nonexpansive, averaged and nonexpansive operators. The structure and properties of the compositions are of particular importance in the proofs of convergence of such algorithms. In this paper, we systematically study the compositions of further special cases of Lipschitz continuous operators. Applications of our results include compositions of scaled conically nonexpansive mappings, as well as the Douglas--Rachford and forward-backward operators, when applied to solve certain structured monotone inclusion and optimization problems. Several examples illustrate and tighten our conclusions.
[ { "created": "Tue, 31 Dec 2019 04:02:25 GMT", "version": "v1" } ]
2020-01-01
[ [ "Giselsson", "Pontus", "" ], [ "Moursi", "Walaa M.", "" ] ]
19
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1,225,061
1912.13166
Besik Chikvinidze
Besik Chikvinidze
An extension of the Jacod's condition
16 pages
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We generalize Jacod's condition and introduce a new type sufficient condition for the uniform integrability of the general stochastic exponential.
[ { "created": "Tue, 31 Dec 2019 04:03:31 GMT", "version": "v1" } ]
2020-01-01
[ [ "Chikvinidze", "Besik", "" ] ]
19
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1,225,062
1912.13167
Xueyuan Zhao
Xueyuan Zhao and Dario Pompili
Transform-Domain Classification of Human Cells based on DNA Methylation Datasets
null
null
null
null
q-bio.GN cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A novel method to classify human cells is presented in this work based on the transform-domain method on DNA methylation data. DNA methylation profile variations are observed in human cells with the progression of disease stages, and the proposal is based on this DNA methylation variation to classify normal and disease cells including cancer cells. The cancer cell types investigated in this work cover hepatocellular (sample size n = 40), colorectal (n = 44), lung (n = 70) and endometrial (n = 87) cancer cells. A new pipeline is proposed integrating the DNA methylation intensity measurements on all the CpG islands by the transformation of Walsh-Hadamard Transform (WHT). The study reveals the three-step properties of the DNA methylation transform-domain data and the step values of association with the cell status. Further assessments have been carried out on the proposed machine learning pipeline to perform classification of the normal and cancer tissue cells. A number of machine learning classifiers are compared for whole sequence and WHT sequence classification based on public Whole-Genome Bisulfite Sequencing (WGBS) DNA methylation datasets. The WHT-based method can speed up the computation time by more than one order of magnitude compared with whole original sequence classification, while maintaining comparable classification accuracy by the selected machine learning classifiers. The proposed method has broad applications in expedited disease and normal human cell classifications by the epigenome and genome datasets.
[ { "created": "Tue, 31 Dec 2019 04:18:11 GMT", "version": "v1" } ]
2020-01-01
[ [ "Zhao", "Xueyuan", "" ], [ "Pompili", "Dario", "" ] ]
19
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1,225,063
1912.13168
Liang Kong
Liang Kong and Wei Yuan and Hao Zheng
Pointed Drinfeld center functor
34 pages, 8 figures, comments are welcome
Comm. Math. Phys. 381 (2021), no.3, 1409--1443
10.1007/s00220-020-03922-x
null
math.QA hep-th math.CT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work, using the functoriality of Drinfeld center of fusion categories, we generalize an earlier result on the functoriality of full center of simple separable algebras in a fixed fusion category to all fusion categories. This generalization produces a new center functor, which involves both Drinfeld center and full center and will be called the pointed Drinfeld center functor. We prove that this pointed Drinfeld center functor is a symmetric monoidal equivalence. It turns out that this functor provides a precise and rather complete mathematical formulation of the boundary-bulk relation of 1+1D rational conformal field theories (RCFT). In this process, we solve an old problem of computing the fusion of two 0D (or 1D) wall CFT's along a non-trivial 1+1D bulk RCFT.
[ { "created": "Tue, 31 Dec 2019 04:31:07 GMT", "version": "v1" } ]
2021-03-03
[ [ "Kong", "Liang", "" ], [ "Yuan", "Wei", "" ], [ "Zheng", "Hao", "" ] ]
19
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1,225,064
1912.13169
Hufei Zhu
Hufei Zhu
Efficient Decremental Learning Algorithms for Broad Learning System
null
null
null
null
cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The decremented learning algorithms are required in machine learning, to prune redundant nodes and remove obsolete inline training samples. In this paper, an efficient decremented learning algorithm to prune redundant nodes is deduced from the incremental learning algorithm 1 proposed in [9] for added nodes, and two decremented learning algorithms to remove training samples are deduced from the two incremental learning algorithms proposed in [10] for added inputs. The proposed decremented learning algorithm for reduced nodes utilizes the inverse Cholesterol factor of the Herminia matrix in the ridge inverse, to update the output weights recursively, as the incremental learning algorithm 1 for added nodes in [9], while that inverse Cholesterol factor is updated with an unitary transformation. The proposed decremented learning algorithm 1 for reduced inputs updates the output weights recursively with the inverse of the Herminia matrix in the ridge inverse, and updates that inverse recursively, as the incremental learning algorithm 1 for added inputs in [10].
[ { "created": "Tue, 31 Dec 2019 04:46:27 GMT", "version": "v1" } ]
2020-01-01
[ [ "Zhu", "Hufei", "" ] ]
19
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1,225,065
1912.13170
Jeremy Heng
Espen Bernton, Jeremy Heng, Arnaud Doucet, Pierre E. Jacob
Schr\"odinger Bridge Samplers
53 pages and 9 figures
null
null
null
stat.CO stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Consider a reference Markov process with initial distribution $\pi_{0}$ and transition kernels $\{M_{t}\}_{t\in[1:T]}$, for some $T\in\mathbb{N}$. Assume that you are given distribution $\pi_{T}$, which is not equal to the marginal distribution of the reference process at time $T$. In this scenario, Schr\"odinger addressed the problem of identifying the Markov process with initial distribution $\pi_{0}$ and terminal distribution equal to $\pi_{T}$ which is the closest to the reference process in terms of Kullback--Leibler divergence. This special case of the so-called Schr\"odinger bridge problem can be solved using iterative proportional fitting, also known as the Sinkhorn algorithm. We leverage these ideas to develop novel Monte Carlo schemes, termed Schr\"odinger bridge samplers, to approximate a target distribution $\pi$ on $\mathbb{R}^{d}$ and to estimate its normalizing constant. This is achieved by iteratively modifying the transition kernels of the reference Markov chain to obtain a process whose marginal distribution at time $T$ becomes closer to $\pi_T = \pi$, via regression-based approximations of the corresponding iterative proportional fitting recursion. We report preliminary experiments and make connections with other problems arising in the optimal transport, optimal control and physics literatures.
[ { "created": "Tue, 31 Dec 2019 04:49:30 GMT", "version": "v1" } ]
2020-01-01
[ [ "Bernton", "Espen", "" ], [ "Heng", "Jeremy", "" ], [ "Doucet", "Arnaud", "" ], [ "Jacob", "Pierre E.", "" ] ]
19
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1,225,066
1912.13171
Chunwei Tian
Chunwei Tian, Lunke Fei, Wenxian Zheng, Yong Xu, Wangmeng Zuo, Chia-Wen Lin
Deep Learning on Image Denoising: An overview
null
null
null
null
eess.IV cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Deep learning techniques have received much attention in the area of image denoising. However, there are substantial differences in the various types of deep learning methods dealing with image denoising. Specifically, discriminative learning based on deep learning can ably address the issue of Gaussian noise. Optimization models based on deep learning are effective in estimating the real noise. However, there has thus far been little related research to summarize the different deep learning techniques for image denoising. In this paper, we offer a comparative study of deep techniques in image denoising. We first classify the deep convolutional neural networks (CNNs) for additive white noisy images; the deep CNNs for real noisy images; the deep CNNs for blind denoising and the deep CNNs for hybrid noisy images, which represents the combination of noisy, blurred and low-resolution images. Then, we analyze the motivations and principles of the different types of deep learning methods. Next, we compare the state-of-the-art methods on public denoising datasets in terms of quantitative and qualitative analysis. Finally, we point out some potential challenges and directions of future research.
[ { "created": "Tue, 31 Dec 2019 05:03:57 GMT", "version": "v1" }, { "created": "Thu, 16 Jan 2020 10:54:04 GMT", "version": "v2" }, { "created": "Wed, 17 Jun 2020 07:26:22 GMT", "version": "v3" }, { "created": "Mon, 3 Aug 2020 06:55:36 GMT", "version": "v4" } ]
2020-08-04
[ [ "Tian", "Chunwei", "" ], [ "Fei", "Lunke", "" ], [ "Zheng", "Wenxian", "" ], [ "Xu", "Yong", "" ], [ "Zuo", "Wangmeng", "" ], [ "Lin", "Chia-Wen", "" ] ]
19
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1,225,067
1912.13172
Yunhyung Cho
Yunhyung Cho
Classification of six dimensional monotone symplectic manifolds admitting semifree circle actions
Complete version (with 110 pages and many figures). We have splitted this manuscript into three parts arXiv:1812.09892, arXiv:1904.10962, and arXiv:1905.07292
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math.SG math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $(M,\omega_M)$ be a six dimensional closed monotone symplectic manifold admitting an effective semifree Hamiltonian $S^1$-action. We show that $(M,\omega_M)$ is $S^1$-equivariant symplectomorphic to some K\"{a}hler Fano manifold $(X,\omega_X, J)$ with a certain holomorphic $\mathbb{C}^*$-action. We also give a complete list of all such Fano manifolds and describe all semifree $\mathbb{C}^*$-actions on them specifically.
[ { "created": "Tue, 31 Dec 2019 05:11:47 GMT", "version": "v1" } ]
2020-01-01
[ [ "Cho", "Yunhyung", "" ] ]
19
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1.3953496217727661, 0.7801339030265808, 0.09626130014657974, -0.6258804798126221 ]
1,225,068
1912.13173
Alexander Shepetov
A. Shepetov, A. Chubenko, B. Iskhakov, O. Kryakunova, O. Kalikulov, S. Mamina, K. Mukashev, V. Piscal, V. Ryabov, N. Saduyev, T. Sadykov, N. Salikhov, E. Tautaev, L. Vil'danova, V. Zhukov
Measurements of the low energy neutron and gamma ray accompaniment of extensive air showers in the knee region of primary cosmic ray spectrum
23 pages, 14 figures. Submitted to European Physical Journal Plus
Eur. Phys. J. Plus 2020 135:96
10.1140/epjp/s13360-019-00092-1
null
astro-ph.HE astro-ph.IM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Purposeful investigation of radiation fluxes strongly delayed in relation to the main particles front of extensive air shower (EAS) was undertaken at the Tien Shan Mountain Cosmic Ray Station. It was found that the passage of the EAS can be accompanied by the delayed thermal neutrons and by the soft $(30-50)$ keV gamma rays, mostly concentrated within a region of about $(5-10)$ m around shower axis, where the integral radiation fluence can vary in the limits of $(10^{-4}-1)$ cm$^{-2}$ for neutrons, and of $(0.1-1000)$ cm$^{-2}$ for gamma rays. The dependence of signal multiplicity on the shower size $N_e$ has a power shape both for the neutron and gamma ray components, with a sharp increase of its power index around the value of $N_e\approx 10^6$, which corresponds to the position of the $3\cdot10^{15}$ eV knee in the primary cosmic ray spectrum. Total duration of detectable radiation signal after the EAS passage can be of some tens of milliseconds in the case of neutron component, and up to a few whole seconds for gamma rays. The delayed accompaniment of low-energy radiation particles can be an effective probe to study the interaction of the hadronic component of EAS.
[ { "created": "Tue, 31 Dec 2019 05:12:40 GMT", "version": "v1" } ]
2020-01-28
[ [ "Shepetov", "A.", "" ], [ "Chubenko", "A.", "" ], [ "Iskhakov", "B.", "" ], [ "Kryakunova", "O.", "" ], [ "Kalikulov", "O.", "" ], [ "Mamina", "S.", "" ], [ "Mukashev", "K.", "" ], [ "Piscal", "V.", "" ], [ "Ryabov", "V.", "" ], [ "Saduyev", "N.", "" ], [ "Sadykov", "T.", "" ], [ "Salikhov", "N.", "" ], [ "Tautaev", "E.", "" ], [ "Vil'danova", "L.", "" ], [ "Zhukov", "V.", "" ] ]
19
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1,225,069
1912.13174
Emanuele Ventura
Hang Huang, Mateusz Micha{\l}ek, Emanuele Ventura
Vanishing Hessian, wild forms and their border VSP
25 pp., main result upgraded to an equivalence
null
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Wild forms are homogeneous polynomials whose smoothable rank is strictly larger than their border rank. The discrepancy between these two ranks is caused by the difference between the limit of spans of a family of zero-dimensional schemes and the span of their flat limit. For concise forms of minimal border rank, we show that the condition of vanishing Hessian is equivalent to being wild. This is proven by making a detour through structure tensors of smoothable and Gorenstein algebras. The equivalence fails in the non-minimal border rank regime. We exhibit an infinite series of minimal border rank wild forms of every degree $d\geq 3$ as well as an infinite series of wild cubics. Inspired by recent work on border apolarity of Buczy\'nska and Buczy\'nski, we study the border varieties of sums of powers $\underline{\mathrm{VSP}}$ of these forms in the corresponding multigraded Hilbert schemes.
[ { "created": "Tue, 31 Dec 2019 05:19:39 GMT", "version": "v1" }, { "created": "Thu, 25 Jun 2020 17:03:52 GMT", "version": "v2" } ]
2020-06-26
[ [ "Huang", "Hang", "" ], [ "Michałek", "Mateusz", "" ], [ "Ventura", "Emanuele", "" ] ]
19
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1,225,070
1912.13175
David J. Aldous
David Aldous
The Nearest Unvisited Vertex Walk on Random Graphs
Minor revision of original. Accepted in PEIS (Probability in the Engineering and Informational Sciences)
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We revisit an old minor topic in algorithms, the deterministic walk on a finite graph which always moves toward the nearest unvisited vertex until every vertex is visited. There is an elementary connection between this cover time and ball-covering (metric entropy) measures. For some familiar models of random graphs, this connection allows the order of magnitude of the cover time to be deduced from first passage percolation estimates. Establishing sharper results seems a challenging problem.
[ { "created": "Tue, 31 Dec 2019 05:20:10 GMT", "version": "v1" }, { "created": "Thu, 18 Mar 2021 15:11:43 GMT", "version": "v2" } ]
2021-03-19
[ [ "Aldous", "David", "" ] ]
19
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1,225,071
1912.13176
Krzysztof Przes{\l}awski
Andrzej P. Kisielewicz and Krzysztof Przes{\l}awski
No more than $2^{d+1}-2$ nearly neighbourly simplices in $\mathbb R^d$
6 pages, accepted to Discrete Comput. Geom
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove a combinatorial theorem on families of disjoint sub-boxes of a discrete cube, which implies that there are at most $2^{d+1}-2$ nearly neighbourly simplices in $\mathbb R^d$.
[ { "created": "Tue, 31 Dec 2019 05:21:58 GMT", "version": "v1" } ]
2020-01-01
[ [ "Kisielewicz", "Andrzej P.", "" ], [ "Przesławski", "Krzysztof", "" ] ]
19
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1,225,072
1912.13177
Xiangdong Zhang
Xulong Yuan, Yunlong Liu and Xiangdong Zhang
Collision of spinning particles near BTZ black holes
14 pages, 1 figure
Chinese Physics C Vol. 44, No. 6 (2020) 065104
10.1088/1674-1137/44/6/065104
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the collision property of spinning particles near a Ba\~nados-Teitelboim-Zanelli (BTZ) black hole. Our results show that although the center-of-mass energy of two ingoing particles diverges if one of the particles possesses a critical angular momentum, however, particle with critical angular momentum can not exist outside of the horizon due to the violation of timelike constraint. Further detailed investigation indicates that only the particle with a subcritical angular momentum is allowed to exist near an extremal rotating BTZ black hole and the corresponding collision center-of-mass energy can be arbitrarily large in a critical angular momentum limit.
[ { "created": "Tue, 31 Dec 2019 05:29:48 GMT", "version": "v1" } ]
2020-04-15
[ [ "Yuan", "Xulong", "" ], [ "Liu", "Yunlong", "" ], [ "Zhang", "Xiangdong", "" ] ]
19
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1,225,073
1912.13178
Xin-Kai Chen
Xinkai Chen, Jing Wang, Xu Kong, Barbara Catinella, Li Shao and Houjun Mo
The growth of bulges and discs in relatively HI-rich galaxies: indication from HI scaling relations
Accepted by MNRAS, 13 pages, 9 figures
null
10.1093/mnras/stz3622
null
astro-ph.GA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the relation between the properties of the bulge/disc components and the HI mass fraction of galaxies. We find that at fixed stellar mass, disc colours are correlated with the HI mass fraction, while bulge colours are not. The lack of a correlation between the bulge colour and the HI mass fraction is regardless whether the bulges are pseudo, or whether the galaxies host bars or are interacting with a neighbour. There is no strong correlation between the colours of the discs and bulges either. These results suggest that the current total amount of HI is closely related to the formation of discs, but does not necessarily fuel the formation of (pseudo) bulges in an efficient way. We do not find evidence for the star formation in the discs to be quenched by the bulges.
[ { "created": "Tue, 31 Dec 2019 05:31:48 GMT", "version": "v1" } ]
2020-01-07
[ [ "Chen", "Xinkai", "" ], [ "Wang", "Jing", "" ], [ "Kong", "Xu", "" ], [ "Catinella", "Barbara", "" ], [ "Shao", "Li", "" ], [ "Mo", "Houjun", "" ] ]
19
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1,225,074
1912.13179
Shadrokh Samavi
Sajjad Abbasi, Mohsen Hajabdollahi, Nader Karimi, Shadrokh Samavi
Modeling Teacher-Student Techniques in Deep Neural Networks for Knowledge Distillation
six pages, 6 figures
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null
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cs.CV cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Knowledge distillation (KD) is a new method for transferring knowledge of a structure under training to another one. The typical application of KD is in the form of learning a small model (named as a student) by soft labels produced by a complex model (named as a teacher). Due to the novel idea introduced in KD, recently, its notion is used in different methods such as compression and processes that are going to enhance the model accuracy. Although different techniques are proposed in the area of KD, there is a lack of a model to generalize KD techniques. In this paper, various studies in the scope of KD are investigated and analyzed to build a general model for KD. All the methods and techniques in KD can be summarized through the proposed model. By utilizing the proposed model, different methods in KD are better investigated and explored. The advantages and disadvantages of different approaches in KD can be better understood and develop a new strategy for KD can be possible. Using the proposed model, different KD methods are represented in an abstract view.
[ { "created": "Tue, 31 Dec 2019 05:32:02 GMT", "version": "v1" } ]
2020-01-01
[ [ "Abbasi", "Sajjad", "" ], [ "Hajabdollahi", "Mohsen", "" ], [ "Karimi", "Nader", "" ], [ "Samavi", "Shadrokh", "" ] ]
19
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1,225,075
1912.13180
Taku J. Sato
Takanobu Hiroto, Taku J Sato, Huibo Cao, Takafumi Hawai, Tetsuya Yokoo, Shinichi Itoh, and Ryuji Tamura
Noncoplanar ferrimagnetism and local crystalline-electric-field anisotropy in the quasicrystal approximant Au$_{70}$Si$_{17}$Tb$_{13}$
14 pages, 10 figures, 3 tables
null
10.1088/1361-648X/ab997d
null
cond-mat.mtrl-sci cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Neutron scattering experiments have been performed to elucidate magnetic properties of the quasicrystal approximant Au$_{70}$Si$_{17}$Tb$_{13}$, consisting of icosahedral spin clusters in a body-centered-cubic lattice. Bulk magnetic measurements performed on the single crystalline sample unambiguously confirm long-range ordering at $T_{\rm C} = 11.6 \pm 1$ K. In contrast to the simple ferromagnetic response in the bulk measurements, single crystal neutron diffraction confirms a formation of intriguing non-collinear and non-coplanar magnetic order. The magnetic moment direction was found to be nearly tangential to the icosahedral cluster surface in the local mirror plane, which is quite similar to that recently found in the antiferromagnetic quasicrystal approximant Au$_{72}$Al$_{14}$Tb$_{14}$. Inelastic neutron scattering on the powdered sample exhibits a very broad peak centered at $\hbar \omega \simeq 4$ meV. The observed inelastic spectrum was explained by the crystalline-electric-field model taking account of the chemical disorder at the fractional Au/Si sites. The resulting averaged anisotropy axis for the crystalline-electric-field ground state is consistent with the ordered moment direction determined in the magnetic structure analysis, confirming that the non-coplanar magnetic order is stabilized by the local uniaxial anisotropy.
[ { "created": "Tue, 31 Dec 2019 05:38:34 GMT", "version": "v1" } ]
2020-08-26
[ [ "Hiroto", "Takanobu", "" ], [ "Sato", "Taku J", "" ], [ "Cao", "Huibo", "" ], [ "Hawai", "Takafumi", "" ], [ "Yokoo", "Tetsuya", "" ], [ "Itoh", "Shinichi", "" ], [ "Tamura", "Ryuji", "" ] ]
19
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1,225,076
1912.13181
Aiguo Xu Prof. Dr.
Ge Zhang, Aiguo Xu, Dejia Zhang, Yingjun Li, Huilin Lai, and Xiaomian Hu
Delineation of the flow and mixing induced by Rayleigh-Taylor instability through tracers
null
Phys. Fluids 33, 076105 (2021)
10.1063/5.0051154
null
physics.flu-dyn cond-mat.stat-mech cs.OH physics.app-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Rayleigh-Taylor-instability(RTI) induced flow and mixing are of great importance in both nature and engineering scenarios. To capture the underpinning physics, tracers are introduced to make a supplement to discrete Boltzmann simulation of RTI in compressible flows. Via marking two types of tracers with different colors, the tracer distribution provides a clear boundary of two fluids during the RTI evolution. Fine structures of the flow and thermodynamic nonequilibrium behavior around the interface in a miscible two-fluid system are delineated. Distribution of tracers in its velocity phase space makes a charming pattern showing quite dense information on the flow behavior, which opens a new perspective for analyzing and accessing significantly deep insights into the flow system. RTI mixing is further investigated via tracer defined local mixedness. The appearance of Kelvin-Helmholtz instability is quantitatively captured by mixedness averaged align the direction of the pressure gradient. The role of compressibility and viscosity on mixing are investigated separately, both of which show two-stage effect. The underlying mechanism of the two-stage effect is interpreted as the development of large structures at the initial stage and the generation of small structures at the late stage. At the late stage, for a fixed time, a saturation phenomenon of viscosity is found that further increase of viscosity cannot see an evident decline in mixedness. The mixing statues of heavy and light fluids are not synchronous and the mixing of a RTI system is heterogenous. The results are helpful for understanding the mechanism of flow and mixing induced by RTI.
[ { "created": "Tue, 31 Dec 2019 05:40:34 GMT", "version": "v1" }, { "created": "Tue, 23 Mar 2021 10:20:45 GMT", "version": "v2" } ]
2022-03-24
[ [ "Zhang", "Ge", "" ], [ "Xu", "Aiguo", "" ], [ "Zhang", "Dejia", "" ], [ "Li", "Yingjun", "" ], [ "Lai", "Huilin", "" ], [ "Hu", "Xiaomian", "" ] ]
19
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1,225,077
1912.13182
Mengting Chen
Mengting Chen, Yuxin Fang, Xinggang Wang, Heng Luo, Yifeng Geng, Xinyu Zhang, Chang Huang, Wenyu Liu, Bo Wang
Diversity Transfer Network for Few-Shot Learning
9 pages, 3 figures, AAAI 2020
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Few-shot learning is a challenging task that aims at training a classifier for unseen classes with only a few training examples. The main difficulty of few-shot learning lies in the lack of intra-class diversity within insufficient training samples. To alleviate this problem, we propose a novel generative framework, Diversity Transfer Network (DTN), that learns to transfer latent diversities from known categories and composite them with support features to generate diverse samples for novel categories in feature space. The learning problem of the sample generation (i.e., diversity transfer) is solved via minimizing an effective meta-classification loss in a single-stage network, instead of the generative loss in previous works. Besides, an organized auxiliary task co-training over known categories is proposed to stabilize the meta-training process of DTN. We perform extensive experiments and ablation studies on three datasets, i.e., \emph{mini}ImageNet, CIFAR100 and CUB. The results show that DTN, with single-stage training and faster convergence speed, obtains the state-of-the-art results among the feature generation based few-shot learning methods. Code and supplementary material are available at: \texttt{https://github.com/Yuxin-CV/DTN}
[ { "created": "Tue, 31 Dec 2019 05:44:38 GMT", "version": "v1" } ]
2020-01-01
[ [ "Chen", "Mengting", "" ], [ "Fang", "Yuxin", "" ], [ "Wang", "Xinggang", "" ], [ "Luo", "Heng", "" ], [ "Geng", "Yifeng", "" ], [ "Zhang", "Xinyu", "" ], [ "Huang", "Chang", "" ], [ "Liu", "Wenyu", "" ], [ "Wang", "Bo", "" ] ]
19
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1,225,078
1912.13183
Shadrokh Samavi
Emad Malekhosseini, Mohsen Hajabdollahi, Nader Karimi, Shadrokh Samavi
Modeling Neural Architecture Search Methods for Deep Networks
6 pages, 7 figures
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There are many research works on the designing of architectures for the deep neural networks (DNN), which are named neural architecture search (NAS) methods. Although there are many automatic and manual techniques for NAS problems, there is no unifying model in which these NAS methods can be explored and compared. In this paper, we propose a general abstraction model for NAS methods. By using the proposed framework, it is possible to compare different design approaches for categorizing and identifying critical areas of interest in designing DNN architectures. Also, under this framework, different methods in the NAS area are summarized; hence a better view of their advantages and disadvantages is possible.
[ { "created": "Tue, 31 Dec 2019 05:51:03 GMT", "version": "v1" } ]
2020-01-01
[ [ "Malekhosseini", "Emad", "" ], [ "Hajabdollahi", "Mohsen", "" ], [ "Karimi", "Nader", "" ], [ "Samavi", "Shadrokh", "" ] ]
19
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1,225,079
1912.13184
Maximilian Fels
Maximilian Fels, Lisa Hartung
Extremes of the 2d scale-inhomogeneous discrete Gaussian free field: Convergence of the maximum in the regime of weak correlations
37 pages, 2 figures
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We continue the study of the maximum of the scale-inhomogeneous discrete Gaussian free field in dimension two. In this paper, we consider the regime of weak correlations and prove the convergence in law of the centred maximum to a randomly shifted Gumbel distribution. In particular, we obtain limiting expressions for the random shift. As in the case of variable speed branching Brownian motion, the shift is of the form CY, where C is a constant that depends only on the variance at the shortest scales, and Y is a random variable that depends only on the variance at the largest scales. Moreover, we investigate the geometry of highest local maxima. We show that they occur in clusters of finite size that are separated by macroscopic distances. The poofs are based on Gaussian comparison with branching random walks and second moment estimates.
[ { "created": "Tue, 31 Dec 2019 05:52:37 GMT", "version": "v1" }, { "created": "Tue, 14 Jan 2020 15:01:48 GMT", "version": "v2" }, { "created": "Fri, 2 Oct 2020 08:37:27 GMT", "version": "v3" } ]
2020-10-05
[ [ "Fels", "Maximilian", "" ], [ "Hartung", "Lisa", "" ] ]
19
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1,225,080
1912.13185
Yiren Wang
Yiren Wang, Dimitris N. Politis
Model-free Bootstrap for a General Class of Stationary Time Series
null
null
null
null
math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A model-free bootstrap procedure for a general class of stationary time series is introduced. The theoretical framework is established, showing asymptotic validity of bootstrap confidence intervals for many statistics of interest. In addition, asymptotic validity of one-step ahead bootstrap prediction intervals is also demonstrated. Finite-sample experiments are conducted to empirically confirm the performance of the new method, and to compare with popular methods such as the block bootstrap and the autoregressive (AR)-sieve bootstrap.
[ { "created": "Tue, 31 Dec 2019 05:58:10 GMT", "version": "v1" } ]
2020-01-01
[ [ "Wang", "Yiren", "" ], [ "Politis", "Dimitris N.", "" ] ]
19
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1,225,081
1912.13186
Robert B. Allen
Robert B. Allen
Definitions and Semantic Simulations Based on Object-Oriented Analysis and Modeling
null
null
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have proposed going beyond traditional ontologies to use rich semantics implemented in programming languages for modeling. In this paper, we discuss the application of executable semantic models to two examples, first a structured definition of a waterfall and second the cardiopulmonary system. We examine the components of these models and the way those components interact. Ultimately, such models should provide the basis for direct representation.
[ { "created": "Tue, 31 Dec 2019 05:59:02 GMT", "version": "v1" } ]
2020-01-01
[ [ "Allen", "Robert B.", "" ] ]
19
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1,225,082
1912.13187
Tongsuo Lu
Yang Lei, Hongbin Wang, Tongsuo Lu, Wenxue Fu, Jing Hu, Dong Wei
Spatio-temporal variation of temperature for the recent 40 years in Lhasa
null
null
null
null
physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It was all known that Lhasa went through a high temperature of 30.8$^{\circ}$C in late June 2019, which hit record highs. To better understand the reasons, based on observations recorded at automatic weather stations in Lhasa, we studied the characteristics of temperature variation at multiple time scales using the linear trend method, Mann-Kendall mutation test, morlet wavelet analysis, R/S analysis and so on. The results showed that: (a) The annual mean temperature (AMT) is rising at a rate of 0.5$^{\circ}$C/10yr, and the average temperature for different seasons also increased significantly, especially in winter. (b) Although there was an intersection in 1995, we found that AMT, did not pass the reliability test of significance level ${\alpha}$ =0.05, this means there are no abrupt changes for AMT, the values are 7.97$^{\circ}$C and 9.15$^{\circ}$C respectively before and after the intersection point. (c) AMT has a periodic oscillation for 18~25yr and 25~32yr based on a mass of data and the wavelet variance diagrams in Lhasa. AMT has a main cycle of 28yr, cyclic Patterns of temperature changes in spring, summer and autumn is similar to AMT, but it is relatively complex in winter. (d) The Hurst index of AMT and different seasons demonstrates that the temperature are likely to continue to rise in the future in Lhasa.
[ { "created": "Tue, 31 Dec 2019 06:00:14 GMT", "version": "v1" } ]
2020-01-01
[ [ "Lei", "Yang", "" ], [ "Wang", "Hongbin", "" ], [ "Lu", "Tongsuo", "" ], [ "Fu", "Wenxue", "" ], [ "Hu", "Jing", "" ], [ "Wei", "Dong", "" ] ]
19
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0.6258425116539001, 0.7930480241775513, 0.8442174196243286, 0.21134598553180695 ]
1,225,083
1912.13188
Ivan Stelmakh
Ivan Stelmakh, Nihar B. Shah and Aarti Singh
On Testing for Biases in Peer Review
null
null
null
null
stat.ME math.ST stat.AP stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the issue of biases in scholarly research, specifically, in peer review. There is a long standing debate on whether exposing author identities to reviewers induces biases against certain groups, and our focus is on designing tests to detect the presence of such biases. Our starting point is a remarkable recent work by Tomkins, Zhang and Heavlin which conducted a controlled, large-scale experiment to investigate existence of biases in the peer reviewing of the WSDM conference. We present two sets of results in this paper. The first set of results is negative, and pertains to the statistical tests and the experimental setup used in the work of Tomkins et al. We show that the test employed therein does not guarantee control over false alarm probability and under correlations between relevant variables coupled with any of the following conditions, with high probability, can declare a presence of bias when it is in fact absent: (a) measurement error, (b) model mismatch, (c) reviewer calibration. Moreover, we show that the setup of their experiment may itself inflate false alarm probability if (d) bidding is performed in non-blind manner or (e) popular reviewer assignment procedure is employed. Our second set of results is positive and is built around a novel approach to testing for biases that we propose. We present a general framework for testing for biases in (single vs. double blind) peer review. We then design hypothesis tests that under minimal assumptions guarantee control over false alarm probability and non-trivial power even under conditions (a)--(c) as well as propose an alternative experimental setup which mitigates issues (d) and (e). Finally, we show that no statistical test can improve over the non-parametric tests we consider in terms of the assumptions required to control for the false alarm probability.
[ { "created": "Tue, 31 Dec 2019 06:17:29 GMT", "version": "v1" } ]
2020-01-01
[ [ "Stelmakh", "Ivan", "" ], [ "Shah", "Nihar B.", "" ], [ "Singh", "Aarti", "" ] ]
19
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1,225,084
1912.13189
Yuntao Zang
Yuntao Zang
Entropies and volume growth of unstable manifolds
14 pages
Ergod. Th. Dynam. Sys. 42 (2022) 1576-1590
10.1017/etds.2021.2
null
math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $f$ be a $C^2$ diffeomorphism on a compact manifold. Ledrappier and Young introduced entropies along unstable foliations for an ergodic measure $\mu$. We relate those entropies to covering numbers in order to give a new upper bound on the metric entropy of $\mu$ in terms of Lyapunov exponents and topological entropy or volume growth of sub-manifolds. We also discuss extensions to the $C^{1+\alpha},\,\alpha>0$ case.
[ { "created": "Tue, 31 Dec 2019 06:24:51 GMT", "version": "v1" }, { "created": "Sun, 19 Jan 2020 16:12:57 GMT", "version": "v2" } ]
2023-06-22
[ [ "Zang", "Yuntao", "" ] ]
19
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1,225,085
1912.13190
He Zhang
He Zhang, Liang Zhang, David H. Mathews, Liang Huang
LinearPartition: Linear-Time Approximation of RNA Folding Partition Function and Base Pairing Probabilities
12 pages main text (10 figures); 6 pages SI (7 figures). Bioinformatics, July 2020 (Proceedings of ISMB 2020)
Bioinformatics, July 2020 (Proceedings of ISMB 2020)
null
null
q-bio.BM cs.DS physics.bio-ph q-bio.QM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
RNA secondary structure prediction is widely used to understand RNA function. Recently, there has been a shift away from the classical minimum free energy (MFE) methods to partition function-based methods that account for folding ensembles and can therefore estimate structure and base pair probabilities. However, the classical partition function algorithm scales cubically with sequence length, and is therefore a slow calculation for long sequences. This slowness is even more severe than cubic-time MFE-based methods due to a larger constant factor in runtime. Inspired by the success of our recently proposed LinearFold algorithm that predicts the approximate MFE structure in linear time, we design a similar linear-time heuristic algorithm, LinearPartition, to approximate the partition function and base pairing probabilities, which is shown to be orders of magnitude faster than Vienna RNAfold and CONTRAfold (e.g., 2.5 days vs. 1.3 minutes on a sequence with length 32,753 nt). More interestingly, the resulting base pairing probabilities are even better correlated with the ground truth structures. LinearPartition also leads to a small accuracy improvement when used for downstream structure prediction on families with the longest length sequences (16S and 23S rRNA), as well as a substantial improvement on long-distance base pairs (500+ nt apart).
[ { "created": "Tue, 31 Dec 2019 06:28:28 GMT", "version": "v1" }, { "created": "Wed, 8 Jan 2020 22:32:20 GMT", "version": "v2" }, { "created": "Sun, 2 Feb 2020 04:39:41 GMT", "version": "v3" } ]
2024-02-08
[ [ "Zhang", "He", "" ], [ "Zhang", "Liang", "" ], [ "Mathews", "David H.", "" ], [ "Huang", "Liang", "" ] ]
19
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1,225,086
1912.13191
Naoyuki Sakumichi
Yuki Yoshikawa, Naoyuki Sakumichi, Ung-il Chung, Takamasa Sakai
Negative energy elasticity in a rubberlike gel
12 pages, 8 figures; published version
Phys. Rev. X 11, 011045 (2021)
10.1103/PhysRevX.11.011045
null
cond-mat.soft cond-mat.mtrl-sci cond-mat.stat-mech physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Rubber elasticity is the archetype of the entropic force emerging from the second law of thermodynamics; numerous experimental and theoretical studies on natural and synthetic rubbers have shown that the elasticity originates mostly from entropy change with deformation. Similarly, in polymer gels containing a large amount of solvent, it has also been postulated that the shear modulus (the modulus of rigidity) $G$, which is a kind of modulus of elasticity, is approximately equivalent to the entropy contribution $G_S$, but this has yet to be verified experimentally. In this study, we measure the temperature dependence of the shear modulus $G$ in a rubberlike (hyperelastic) polymer gel whose polymer volume fraction is at most 0.1. As a result, we find that the energy contribution $G_E=G-G_S$ can be a significant negative value, reaching up to double the shear modulus $G$ (i.e., $\left|G_E\right| \simeq 2G$), although the shear modulus of stable materials is generally bound to be positive. We further argue that the energy contribution $G_E$ is governed by a vanishing temperature that is a universal function of the normalized polymer concentration, and $G_E$ vanishes when the solvent is removed. Our findings highlight the essential difference between rubber elasticity and gel elasticity (which were previously thought to be the same) and push the established field of gel elasticity into a new direction.
[ { "created": "Tue, 31 Dec 2019 06:28:59 GMT", "version": "v1" }, { "created": "Fri, 4 Sep 2020 10:48:59 GMT", "version": "v2" }, { "created": "Thu, 24 Dec 2020 07:21:25 GMT", "version": "v3" }, { "created": "Mon, 8 Mar 2021 15:07:34 GMT", "version": "v4" } ]
2021-03-09
[ [ "Yoshikawa", "Yuki", "" ], [ "Sakumichi", "Naoyuki", "" ], [ "Chung", "Ung-il", "" ], [ "Sakai", "Takamasa", "" ] ]
19
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1,225,087
1912.13192
Shaoshuai Shi
Shaoshuai Shi, Chaoxu Guo, Li Jiang, Zhe Wang, Jianping Shi, Xiaogang Wang, Hongsheng Li
PV-RCNN: Point-Voxel Feature Set Abstraction for 3D Object Detection
Accepted by CVPR 2020. arXiv admin note: substantial text overlap with arXiv:2102.00463
null
null
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cs.CV cs.LG eess.IV
http://creativecommons.org/licenses/by-nc-sa/4.0/
We present a novel and high-performance 3D object detection framework, named PointVoxel-RCNN (PV-RCNN), for accurate 3D object detection from point clouds. Our proposed method deeply integrates both 3D voxel Convolutional Neural Network (CNN) and PointNet-based set abstraction to learn more discriminative point cloud features. It takes advantages of efficient learning and high-quality proposals of the 3D voxel CNN and the flexible receptive fields of the PointNet-based networks. Specifically, the proposed framework summarizes the 3D scene with a 3D voxel CNN into a small set of keypoints via a novel voxel set abstraction module to save follow-up computations and also to encode representative scene features. Given the high-quality 3D proposals generated by the voxel CNN, the RoI-grid pooling is proposed to abstract proposal-specific features from the keypoints to the RoI-grid points via keypoint set abstraction with multiple receptive fields. Compared with conventional pooling operations, the RoI-grid feature points encode much richer context information for accurately estimating object confidences and locations. Extensive experiments on both the KITTI dataset and the Waymo Open dataset show that our proposed PV-RCNN surpasses state-of-the-art 3D detection methods with remarkable margins by using only point clouds. Code is available at https://github.com/open-mmlab/OpenPCDet.
[ { "created": "Tue, 31 Dec 2019 06:34:10 GMT", "version": "v1" }, { "created": "Fri, 9 Apr 2021 06:37:15 GMT", "version": "v2" } ]
2021-04-12
[ [ "Shi", "Shaoshuai", "" ], [ "Guo", "Chaoxu", "" ], [ "Jiang", "Li", "" ], [ "Wang", "Zhe", "" ], [ "Shi", "Jianping", "" ], [ "Wang", "Xiaogang", "" ], [ "Li", "Hongsheng", "" ] ]
19
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1,225,088
1912.13193
Satyendra Kumar Mishra
Satyendra Kumar Mishra, Goutam Mukherjee, and Anita Naolekar
Cohomology and deformations of Filippov algebroids
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null
null
null
math.DG math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this article, we study the deformations of Filippov algebroids. We define a differential graded Lie algebra (in short DGLA) for a Filippov algebroid by introducing the notion of Filippov multiderivations for a vector bundle. Later on, we discuss deformations of a Filippov algebroid in terms of low-dimensional cohomology associated to this DGLA. We define Nijenhuis operators on Filippov algebroids and characterize trivial deformations of Filippov algebroids in terms of these operators. In the end, we define finite order deformations and discuss the problem of extending a given finite order deformation to a deformation of a higher order.
[ { "created": "Tue, 31 Dec 2019 06:35:32 GMT", "version": "v1" }, { "created": "Sun, 14 Jun 2020 15:33:25 GMT", "version": "v2" }, { "created": "Fri, 2 Jul 2021 06:06:42 GMT", "version": "v3" } ]
2021-07-05
[ [ "Mishra", "Satyendra Kumar", "" ], [ "Mukherjee", "Goutam", "" ], [ "Naolekar", "Anita", "" ] ]
19
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1,225,089
1912.13194
Jialong Han
Jialong Han, Aixin Sun, Haisong Zhang, Chenliang Li, Shuming Shi
CASE: Context-Aware Semantic Expansion
Accepted by AAAI 2020
null
null
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we define and study a new task called Context-Aware Semantic Expansion (CASE). Given a seed term in a sentential context, we aim to suggest other terms that well fit the context as the seed. CASE has many interesting applications such as query suggestion, computer-assisted writing, and word sense disambiguation, to name a few. Previous explorations, if any, only involve some similar tasks, and all require human annotations for evaluation. In this study, we demonstrate that annotations for this task can be harvested at scale from existing corpora, in a fully automatic manner. On a dataset of 1.8 million sentences thus derived, we propose a network architecture that encodes the context and seed term separately before suggesting alternative terms. The context encoder in this architecture can be easily extended by incorporating seed-aware attention. Our experiments demonstrate that competitive results are achieved with appropriate choices of context encoder and attention scoring function.
[ { "created": "Tue, 31 Dec 2019 06:38:57 GMT", "version": "v1" } ]
2020-01-01
[ [ "Han", "Jialong", "" ], [ "Sun", "Aixin", "" ], [ "Zhang", "Haisong", "" ], [ "Li", "Chenliang", "" ], [ "Shi", "Shuming", "" ] ]
19
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1,225,090
1912.13195
Dmitry Tkachev
Alexander Blokhin, Dmitry Tkachev
Stability of a Poiseuille-type flow for a MHD model of an incompressible polymeric fluid
null
European Journal of Mechanics - B/Fluids, 80 (2020), 112-121
10.1016/j.euromechflu.2019.12.006
null
math-ph math.MP
http://creativecommons.org/licenses/by/4.0/
We study a generalization of the Pokrovski--Vinogradov model for flows of solutions and melts of an incompressible viscoelastic polymeric medium to nonisothermal flows in an infinite plane channel under the influence of magnetic field. For the linearized problem (when the basic solution is an analogue of the classical Poiseuille flow for a viscous fluid described by the Navier-Stokes equations) we find a formal asymptotic representation for the eigenvalues under the growth of their modulus. We obtain a necessary condition for the asymptotic stability of a Poiseuille-type shear flow.
[ { "created": "Tue, 31 Dec 2019 06:39:49 GMT", "version": "v1" } ]
2020-02-19
[ [ "Blokhin", "Alexander", "" ], [ "Tkachev", "Dmitry", "" ] ]
19
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1,225,091
1912.13196
Chengpeng Wu
Chengpeng Wu, Li Zhang, Xinbin Li, Zhiqiang Chen, Yuxiang Xing, Xiaohua Zhu, Hewei Gao
Truncated analytic moment analysis and its hybrid-field contrast in grating-based x-ray phase contrast imaging
9 pages, 10 figures
null
null
null
physics.med-ph eess.IV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For grating-based x-ray phase contrast imaging (GPCI), a multi-order moment analysis (MMA) has been recently developed to obtain multiple contrasts from the ultra-small-angle x-ray scattering distribution, as a novel information retrieval approach that is totally different from the conventional Fourier components analysis (FCA). In this paper, we present an analytic form of MMA in theory that can retrieve multiple contrasts directly from raw phase-stepping images, with no scattering distribution involved. For practical implementation, a truncated analytic analysis (called as TA-MMA) is adopted and it is hundreds of times faster in computation than the original deconvolution-based MMA (called as DB-MMA). More importantly, TA-MMA is proved to establish a quantitative connection between FCA and MMA, i.e., the first-order moment computed by TA-MMA is essentially the product of the phase contrast and the dark-field contrast retrieved by FCA, providing a new physical parameter for GPCI. The new physical parameter, in fact, can be treated as a ``hybrid-field'' contrast as it fuses the original phase contrast and dark-field contrast in a straightforward manner, which may be the first physical fusion contrast in GPCI to our knowledge and may have a potential to be directly used in practical applications.
[ { "created": "Tue, 31 Dec 2019 06:40:00 GMT", "version": "v1" } ]
2020-01-01
[ [ "Wu", "Chengpeng", "" ], [ "Zhang", "Li", "" ], [ "Li", "Xinbin", "" ], [ "Chen", "Zhiqiang", "" ], [ "Xing", "Yuxiang", "" ], [ "Zhu", "Xiaohua", "" ], [ "Gao", "Hewei", "" ] ]
19
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1,225,092
1912.13197
Nana Shatashvili Prof.
N.L. Shatashvili, S.M. Mahajan, V.I. Berezhiani
Nonlinear Coupling of Electromagnetic and Electron Acoustic Waves in Multi-Species Degenerate Astrophysical Plasma
8 pages of two-column text, accepted for publication to Physics of Plasmas
null
10.1063/1.5135959
null
physics.plasm-ph astro-ph.SR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nonlinear wave--coupling is studied in a multi-species degenerate astrophysical plasma consisting of two electron species (at different temperatures): a highly degenerate main component plus a smaller classical relativistic flow immersed in a static neutralizing ion background. It is shown that the high frequency electromagnetic (HF EM) waves, through their strong nonlinear interactions with the electron--acoustic waves (sustained by a multi-electron component (degenerate) plasma surrounding a compact astrophysical object) can scatter to lower frequencies so that the radiation observed faraway will be spectrally shifted downwards. It is also shown that, under definite conditions, the EM waves could settle into stationary Solitonic states. It is expected that the effects of such structures may persist as detectable signatures in forms of modulated micro-pulses in the radiation observed far away from the accreting compact object. Both these effects will advance our abilities to interpret the radiation coming out of the compact objects.
[ { "created": "Tue, 31 Dec 2019 06:52:04 GMT", "version": "v1" } ]
2020-02-19
[ [ "Shatashvili", "N. L.", "" ], [ "Mahajan", "S. M.", "" ], [ "Berezhiani", "V. I.", "" ] ]
19
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1,225,093
1912.13198
Hiroshi Kimura
Hiroshi Kimura, Martin Hilchenbach, Sihane Merouane, John Paquette, Oliver Stenzel
The Morphological, Elastic, and Electric Properties of Dust Aggregates in Comets: A Close Look at COSIMA/Rosetta's Data on Dust in Comet 67P/Churyumov-Gerasimenko
17 pages, 12 figures, 1 tables, to appear in Planetary and Space Science
null
10.1016/j.pss.2019.104825
null
astro-ph.EP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Cometary Secondary Ion Mass Analyzer (COSIMA) onboard ESA's Rosetta orbiter has revealed that dust particles in the coma of Comet 67P/Churyumov-Gerasimenko are aggregates of small grains. We study the morphological, elastic, and electric properties of dust aggregates in the coma of Comet 67P/Churyumov-Gerasimenko using optical microscopic images taken by the COSIMA instrument. Dust aggregates in COSIMA images are well represented as fractals in harmony with morphological data from MIDAS (Micro-Imaging Dust Analysis System) and GIADA (Grain Impact Analyzer and Dust Accumulator) onboard Rosetta. COSIMA's images, together with the data from the other Rosetta's instruments such as MIDAS and GIADA do not contradict the so-called rainout growth of $10~\mu\mathrm{m}$-sized particles in the solar nebula. The elastic and electric properties of dust aggregates measured by COSIMA suggest that the surface chemistry of cometary dust is well represented as carbonaceous matter rather than silicates or ices, consistent with the mass spectra, and that organic matter is to some extent carbonized by solar radiation, as inferred from optical and infrared observations of various comets. Electrostatic lofting of cometary dust by intense electric fields at the terminator of its parent comet is unlikely, unless the surface chemistry of the dust changes from a dielectric to a conductor. Our findings are not in conflict with our current understanding of comet formation and evolution, which begin with the accumulation of condensates in the solar nebula and follow with the formation of a dust mantle in the inner solar system.
[ { "created": "Tue, 31 Dec 2019 06:54:12 GMT", "version": "v1" }, { "created": "Mon, 6 Jan 2020 05:10:34 GMT", "version": "v2" } ]
2020-01-07
[ [ "Kimura", "Hiroshi", "" ], [ "Hilchenbach", "Martin", "" ], [ "Merouane", "Sihane", "" ], [ "Paquette", "John", "" ], [ "Stenzel", "Oliver", "" ] ]
19
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1,225,094
1912.13199
Seyed Vahid Mirnezami
Ali HamidiSepehr, Seyed Vahid Mirnezami, Jason K. Ward
Comparison of object detection methods for crop damage assessment using deep learning
null
null
null
null
cs.CV cs.LG eess.IV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Severe weather events can cause large financial losses to farmers. Detailed information on the location and severity of damage will assist farmers, insurance companies, and disaster response agencies in making wise post-damage decisions. The goal of this study was a proof-of-concept to detect damaged crop areas from aerial imagery using computer vision and deep learning techniques. A specific objective was to compare existing object detection algorithms to determine which was best suited for crop damage detection. Two modes of crop damage common in maize (corn) production were simulated: stalk lodging at the lowest ear and stalk lodging at ground level. Simulated damage was used to create a training and analysis data set. An unmanned aerial system (UAS) equipped with a RGB camera was used for image acquisition. Three popular object detectors (Faster R-CNN, YOLOv2, and RetinaNet) were assessed for their ability to detect damaged regions in a field. Average precision was used to compare object detectors. YOLOv2 and RetinaNet were able to detect crop damage across multiple late-season growth stages. Faster R-CNN was not successful as the other two advanced detectors. Detecting crop damage at later growth stages was more difficult for all tested object detectors. Weed pressure in simulated damage plots and increased target density added additional complexity.
[ { "created": "Tue, 31 Dec 2019 06:54:48 GMT", "version": "v1" }, { "created": "Tue, 21 Apr 2020 03:50:21 GMT", "version": "v2" }, { "created": "Wed, 22 Apr 2020 00:32:32 GMT", "version": "v3" } ]
2020-04-23
[ [ "HamidiSepehr", "Ali", "" ], [ "Mirnezami", "Seyed Vahid", "" ], [ "Ward", "Jason K.", "" ] ]
19
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1,225,095
1912.13200
Hanting Chen
Hanting Chen, Yunhe Wang, Chunjing Xu, Boxin Shi, Chao Xu, Qi Tian, Chang Xu
AdderNet: Do We Really Need Multiplications in Deep Learning?
New version in arXiv:2105.14202
CVPR 2020
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Compared with cheap addition operation, multiplication operation is of much higher computation complexity. The widely-used convolutions in deep neural networks are exactly cross-correlation to measure the similarity between input feature and convolution filters, which involves massive multiplications between float values. In this paper, we present adder networks (AdderNets) to trade these massive multiplications in deep neural networks, especially convolutional neural networks (CNNs), for much cheaper additions to reduce computation costs. In AdderNets, we take the $\ell_1$-norm distance between filters and input feature as the output response. The influence of this new similarity measure on the optimization of neural network have been thoroughly analyzed. To achieve a better performance, we develop a special back-propagation approach for AdderNets by investigating the full-precision gradient. We then propose an adaptive learning rate strategy to enhance the training procedure of AdderNets according to the magnitude of each neuron's gradient. As a result, the proposed AdderNets can achieve 74.9% Top-1 accuracy 91.7% Top-5 accuracy using ResNet-50 on the ImageNet dataset without any multiplication in convolution layer. The codes are publicly available at: https://github.com/huaweinoah/AdderNet.
[ { "created": "Tue, 31 Dec 2019 06:56:47 GMT", "version": "v1" }, { "created": "Thu, 2 Jan 2020 06:26:02 GMT", "version": "v2" }, { "created": "Thu, 9 Jan 2020 02:31:03 GMT", "version": "v3" }, { "created": "Fri, 28 May 2021 03:25:46 GMT", "version": "v4" }, { "created": "Tue, 29 Jun 2021 09:53:28 GMT", "version": "v5" }, { "created": "Thu, 1 Jul 2021 04:46:58 GMT", "version": "v6" } ]
2021-07-13
[ [ "Chen", "Hanting", "" ], [ "Wang", "Yunhe", "" ], [ "Xu", "Chunjing", "" ], [ "Shi", "Boxin", "" ], [ "Xu", "Chao", "" ], [ "Tian", "Qi", "" ], [ "Xu", "Chang", "" ] ]
19
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1,225,096
1912.13201
Erfan Amini
Erfan Amini and Seyed Taghi Omid Naeeni and Pedram Ghaderi and Fereidoun Amini
Investigating Wave Energy Potential in Southern Coasts of the Caspian Sea Using Grey Wolf Optimizer Algorithm
null
null
null
null
cs.NE cs.NA math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There is a significantly accelerating trend in the application of the marine wave energy converters in recent years. As a result, it is imperative to adopt a suitable point for implementing these systems. Besides, the Caspian Sea, as one of the most important marine renewable energy sources in Asia, is capable of supplying the coastal areas with a large amount of energy. Therefore, areas around nine ports in the southern coasts of the Caspian Sea were selected to measure their wave energy potential. Initially, the amount of energy on these points was measured using the irregular energy theory. It was observed that the wave power was higher in the southwestern areas (within the Kiashahr coast and Anzali port) than the southeastern areas. A new approach was developed to compare these points and measure their fitnesses in supplying the maximum energy using the Grey Wolf optimizer (GWO) algorithm and time history analysis. In this method, the optimal parameters were first extracted from the algorithm for assessing the points within the southern areas of the Caspian Sea. These values were regarded as the assessment indices. Then, the fitness of each point was obtained using the correlation function and the norm vector to present the most optimal position with maximum wave energy exploitation potential. This new approach was validated with analytical data, and its accuracy in predicting and comparing the wave power on different points was approved. Finally, by a side-by-side comparison of the parameters affecting the wave energy, the optimum range of significant wave height and wave energy period was achieved.
[ { "created": "Tue, 31 Dec 2019 07:02:50 GMT", "version": "v1" }, { "created": "Sun, 23 Aug 2020 16:53:20 GMT", "version": "v2" } ]
2020-08-25
[ [ "Amini", "Erfan", "" ], [ "Naeeni", "Seyed Taghi Omid", "" ], [ "Ghaderi", "Pedram", "" ], [ "Amini", "Fereidoun", "" ] ]
19
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1,225,097
1912.13202
Ming-Hao Liu
Wun-Hao Kang, Szu-Chao Chen, Ming-Hao Liu
Cloning of Zero Modes in One-Dimensional Graphene Superlattices
5 pages with 4 figures for the main paper; supplementary material of 4 pages with 4 figures included
Phys. Rev. B 102, 195432 (2020)
10.1103/PhysRevB.102.195432
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
One-dimensional (1D) graphene superlattices have been predicted to exhibit zero-energy modes a decade ago, but an experimental proof has remained missing. Motivated by a recent experiment that could possibly shed light on this, here we perform quantum transport simulations for 1D graphene superlattices, considering electrostatically simulated potential profiles as realistic as possible. Combined with the analysis on the corresponding miniband structures, we find that the zero modes generated by the 1D superlattice potential can be further cloned to higher energies, which are also accessible by tuning the average density. Our multiterminal transverse magnetic focusing simulations further reveal the modulation-controllable ballistic miniband transport for 1D graphene superlattices. A simple idea for creating a perfectly symmetric periodic potential with strong modulation is proposed at the end of this work, generating well aligned zero modes up to 6 within a reasonable gate strength.
[ { "created": "Tue, 31 Dec 2019 07:09:21 GMT", "version": "v1" } ]
2020-12-15
[ [ "Kang", "Wun-Hao", "" ], [ "Chen", "Szu-Chao", "" ], [ "Liu", "Ming-Hao", "" ] ]
19
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1,225,098
1912.13203
Xiaojing Chen
Shuyan Hu, Xiaojing Chen, Wei Ni, Xin Wang, Ekram Hossain
Modeling and Analysis of Energy Harvesting and Smart Grid-Powered Wireless Communication Networks: A Contemporary Survey
31 pages, 12 figures
null
null
null
eess.SY cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The advancements in smart power grid and the advocation of ``green communications'' have inspired the wireless communication networks to harness energy from ambient environments and operate in an energy-efficient manner for economic and ecological benefits. This article presents a contemporary review of recent breakthroughs on the utilization, redistribution, trading and planning of energy harvested in future wireless networks interoperating with smart grids. This article starts with classical models of renewable energy harvesting technologies. We embark on constrained operation and optimization of different energy harvesting wireless systems, such as point-to-point, multipoint-to-point, multipoint-to-multipoint, multi-hop, and multi-cell systems. We also review wireless power and information transfer technologies which provide a special implementation of energy harvesting wireless communications. A significant part of the article is devoted to the redistribution of redundant (unused) energy harvested within cellular networks, the energy planning under dynamic pricing when smart grids are in place, and two-way energy trading between cellular networks and smart grids. Applications of different optimization tools, such as convex optimization, Lagrangian dual-based method, subgradient method, and Lyapunov-based online optimization, are compared. This article also collates the potential applications of energy harvesting techniques in emerging (or upcoming) 5G/B5G communication systems. It is revealed that an effective redistribution and two-way trading of energy can significantly reduce the electricity bills of wireless service providers and decrease the consumption of brown energy. A list of interesting research directions are provided, requiring further investigation.
[ { "created": "Tue, 31 Dec 2019 07:11:06 GMT", "version": "v1" } ]
2020-01-01
[ [ "Hu", "Shuyan", "" ], [ "Chen", "Xiaojing", "" ], [ "Ni", "Wei", "" ], [ "Wang", "Xin", "" ], [ "Hossain", "Ekram", "" ] ]
19
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