cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Bipolar fuzzy relation equations systems based on the product t-norm
Creators: name: Cornejo, M. Eugenia
name: Lobo, David
name: Medina, Jesús
Publisher: name: arXiv
Year: 2024
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Bipolar fuzzy relation equations arise as a generalization of fuzzy relation equations considering unknown variables together with their logical connective negations. The occurrence of a variable and the occurrence of its negation simultaneously can give very useful information for certain frameworks where the human reasoning plays a key role. Hence, the resolution of bipolar fuzzy relation equations systems is a research topic of great interest.
 This paper focuses on the study of bipolar fuzzy relation equations systems based on the max-product t-norm composition. Specifically, the solvability and the algebraic structure of the set of solutions of these bipolar equations systems will be studied, including the case in which such systems are composed of equations whose independent term be equal to zero. As a consequence, this paper complements the contribution carried out by the authors on the solvability of bipolar max-product fuzzy relation equations.
The GLARE Survey II. Faint z=6 Ly-alpha Line Emitters in the HUDF
Creators: name: Stanway, Elizabeth R
name: Bunker, Andrew J
name: Glazebrook, Karl
name: Abraham, Roberto G
name: Rhoads, James
name: Malhotra, Sangeeta
name: Crampton, David
name: Colless, Matthew
name: Chiu, Kuenley
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The galaxy population at z~6 has been the subject of intense study in recent years, culminating in the Hubble Ultra Deep Field (HUDF) -- the deepest imaging survey yet. A large number of high redshift galaxy candidates have been identified within the HUDF, but until now analysis of their properties has been hampered by the difficulty of obtaining spectroscopic redshifts for these faint galaxies. Our ''Gemini Lyman-Alpha at Reionisation Era'' (GLARE) project has been designed to undertake spectroscopic follow up of faint (z'<28.5) i'-drop galaxies at z~6 in the HUDF. In a previous paper we presented preliminary results from the first 7.5 hours of data from GLARE. In this paper we detail the complete survey. We have now obtained 36 hours of spectroscopy on a single GMOS slitmask from Gemini-South, with a spectral resolution of lambda/Delta(lambda) ~ 1000. We identify five strong Lyman-alpha emitters at z>5.5, and a further nine possible line emitters with detections at lower significance. We also place tight constraints on the equivalent width of Lyman-alpha emission for a further ten i'-drop galaxies and examine the equivalent width distribution of this faint spectroscopic sample of z~6 galaxies. We find that the fraction of galaxies with little or no emission is similar to that at z~3, but that the z~6 population has a tail of sources with high rest frame equivalent widths. Possible explanations for this effect include a tendency towards stronger line emission in faint sources, which may arise from extreme youth or low metallicity in the Lyman-break population at high redshift, or possibly a top-heavy initial mass function.
description: 14 pages. MNRAS accepted
Ο ρόλος της Δραματικής Τέχνης στην ένταξη μαθητών με ειδικές ανάγκες : πρόταση παρέμβασης σε ενταξιακή τάξη
Creators: name: Τολιάδου, Αικατερίνη Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Εκπαιδευτικό Δράμα
Ένταξη
Ειδικές εκπαιδευτικές ανάγκες
Drama in Education
Inclusion
Children in Special Needs

description: Ο κύριος στόχος αυτής της εργασίας είναι να διερευνήσει το ρόλο της δραματικής Τέχνης στην ένταξη μαθητών με ειδικές εκπαιδευτικές ανάγκες στην ομάδα των συνομηλίκων. Πιο συγκεκριμένα εάν οι σχεδιασμοί του εκπαιδευτικού Δράματος που εφαρμόστηκαν ( 1 pre και 2 post ) ενίσχυσαν τη συνοχή της ομάδας της τάξης, έκαναν τα παιδιά με ειδικές εκπαιδευτικές ανάγκες πιο ενεργά και συμμετοχικά. Στο πρώτο μέρος γίνεται μια εισαγωγή στους ορισμούς και τους στόχους του εκπαιδευτικού δράματος, στην επιρροή της δραματικής τέχνης σε αυτό και το παιδαγωγικό του υπόβαθρο. Εν συνεχεία αναφέρεται η λειτουργία του στην ειδική αγωγή αλλά και στη συμβολή του στην ενταξιακή εκπαίδευση. Στο δεύτερο μέρος γίνεται αναφορά στη δομή των σχεδιασμών για το drama και στους τρόπους με τους οποίους αυτοί σχεδιάζονται έτσι ώστε να είναι ορθοί και λειτουργικοί. Το τρίτο μέρος αποτελεί τη μεθοδολογία, τον τρόπο δηλαδή που εργάστηκα έτσι ώστε να υλοποιήσω το πρόγραμμα της παρέμβασης μου. Αναφέρονται εκ νέου οι στόχοι και η ομάδα στόχος καθώς και το προφίλ των μαθητών της τάξης. Αναλύονται και περιγράφονται οι σχεδιασμοί και γίνεται καταμέτρηση των δράσεων και δραστηριοτήτων του καθενός με την μορφή πινάκων. Τέλος αναφέρονται τα συμπεράσματα για την ομάδα αλλά και για την ομάδα στόχο και γίνεται μια ανασκόπηση του όλου εγχειρήματος.
description: The main objective of this study is to investigate the role of Drama in the inclusion of Special Education needs student in peer group. More specifically, if the plans of educational Drama applied (1 pre and 2 post) strengthened the cohesion of the class group , did children with special educational needs more active and participatory. The first part is an introduction to the definitions and objectives of Drama in education , the influence of Drama Art in it and the educational background of it. Then I indicate the operation of special education and its contribution to inclusive education .The second part refers to the structure of designs for drama and how Drama programs are designed in order to be correct and functional. The third part is the methodology , the way that I worked to materialize the program of my intervention . Continuing by mentioning again the objectives and the target group and profile of the students in the class and analyzing and describing the plans made and count the actions and activities of each, in the form of tables it is ending the third part. Finally are referred the findings as regards the group but also for the target group and the overview of the whole enterprise .
Embedding Node Structural Role Identity into Hyperbolic Space
Creators: name: Wang, Lili
name: Lu, Ying
name: Huang, Chenghan
name: Vosoughi, Soroush
Publisher: name: arXiv
Year: 2020
Subjects: subject: Social and Information Networks (cs.SI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Recently, there has been an interest in embedding networks in hyperbolic space, since hyperbolic space has been shown to work well in capturing graph/network structure as it can naturally reflect some properties of complex networks. However, the work on network embedding in hyperbolic space has been focused on microscopic node embedding. In this work, we are the first to present a framework to embed the structural roles of nodes into hyperbolic space. Our framework extends struct2vec, a well-known structural role preserving embedding method, by moving it to a hyperboloid model. We evaluated our method on four real-world and one synthetic network. Our results show that hyperbolic space is more effective than euclidean space in learning latent representations for the structural role of nodes.
description: In Proceedings of the 29th ACM International Conference on Information and Knowledge Management (CIKM '20), October 19-23, 2020, Virtual Event, Ireland
Decoding Multivariate Multiplicity Codes on Product Sets
Creators: name: Bhandari, Siddharth
name: Harsha, Prahladh
name: Kumar, Mrinal
name: Sudan, Madhu
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Theory (cs.IT)
subject: Computational Complexity (cs.CC)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences

description: The multiplicity Schwartz-Zippel lemma bounds the total multiplicity of zeroes of a multivariate polynomial on a product set. This lemma motivates the multiplicity codes of Kopparty, Saraf and Yekhanin [J. ACM, 2014], who showed how to use this lemma to construct high-rate locally-decodable codes. However, the algorithmic results about these codes crucially rely on the fact that the polynomials are evaluated on a vector space and not an arbitrary product set. In this work, we show how to decode multivariate multiplicity codes of large multiplicities in polynomial time over finite product sets (over fields of large characteristic and zero characteristic). Previously such decoding algorithms were not known even for a positive fraction of errors. In contrast, our work goes all the way to the distance of the code and in particular exceeds both the unique decoding bound and the Johnson bound. For errors exceeding the Johnson bound, even combinatorial list-decodablity of these codes was not known. Our algorithm is an application of the classical polynomial method directly to the multivariate setting. In particular, we do not rely on a reduction from the multivariate to the univariate case as is typical of many of the existing results on decoding codes based on multivariate polynomials. However, a vanilla application of the polynomial method in the multivariate setting does not yield a polynomial upper bound on the list size. We obtain a polynomial bound on the list size by taking an alternative view of multivariate multiplicity codes. In this view, we glue all the partial derivatives of the same order together using a fresh set $z$ of variables. We then apply the polynomial method by viewing this as a problem over the field $\mathbb{F}(z)$ of rational functions in $z$.
description: 35 pages
L’Avversario. Il romanzo di Carrère nella lettura scenica di Invisibile Kollettivo
Creators: name: Scarioni, Veronica
Publisher: name: Itinera
Year: 2019

description: The paper aims to illustrate the Italian play L’Avversario, a work by Invisibile Kollettivo that tries to translate into a theatrical show the roman written by the French author Emmanuel Carrère. Both in the roman and in the play the most important aspect is the author’s point of view together with his feelings. This results quite normal referring to a book, but it is way too original in a theatrical play. So, the paper tries to explain the motivation that moved the Italian artists to stay loyal to the spirit of the book, choosing the form of the scenic reading for bringing it on stage. Theatre, Carrère, Lettura scenica, Teatro dell’Elfo, Invisibile Kollettivo
description: Itinera, N. 17 (2019): Réécriture scénique et sources: du roman français à la scène théâtrale italienne
The Technologies Required for Fusing HPC and Real-Time Data to Support Urgent Computing
Creators: name: Gibb, Gordon
name: Nash, Rupert
name: Brown, Nick
name: Prodan, Bianca
Publisher: name: arXiv
Year: 2020
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: The use of High Performance Computing (HPC) to compliment urgent decision making in the event of disasters is an important future potential use of supercomputers. However, the usage modes involved are rather different from how HPC has been used traditionally. As such, there are many obstacles that need to be overcome, not least the unbounded wait times in the batch system queues, to make the use of HPC in disaster response practical. In this paper, we present how the VESTEC project plans to overcome these issues and develop a working prototype of an urgent computing control system. We describe the requirements for such a system and analyse the different technologies available that can be leveraged to successfully build such a system. We finally explore the design of the VESTEC system and discuss ongoing challenges that need to be addressed to realise a production level system.
description: Preprint of paper in 2019 IEEE/ACM HPC for Urgent Decision Making (UrgentHPC)
Gauge/Gravity Duality and Warped Resolved Conifold
Creators: name: Klebanov, Igor R.
name: Murugan, Arvind
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study supergravity backgrounds encoded through the gauge/string correspondence by the SU(N) \times SU(N) theory arising on N D3-branes on the conifold. As discussed in hep-th/9905104, the dynamics of this theory describes warped versions of both the singular and the resolved conifolds through different (symmetry breaking) vacua. We construct these supergravity solutions explicitly and match them with the gauge theory with different sets of vacuum expectation values of the bi-fundamental fields A_1, A_2, B_1, B_2. For the resolved conifold, we find a non-singular SU(2)\times U(1)\times U(1) symmetric warped solution produced by a stack of D3-branes localized at a point on the blown-up 2-sphere. It describes a smooth RG flow from AdS_5 \times T^{1,1} in the UV to AdS_5 \times S^5 in the IR, produced by giving a VEV to just one field, e.g. B_2. The presence of a condensate of baryonic operator det B_2 is confirmed using a Euclidean D3-brane wrapping a 4-cycle inside the resolved conifold. The Green's functions on the singular and resolved conifolds are central to our calculations and are discussed in some detail.
description: 22 pages, 2 figures, v2 added note on wrapped euclidean D3 brane, other minor corrections
Complexity of Dynamical Sphere in Self-interacting Brans-Dicke Gravity
Creators: name: Sharif, M.
name: Majid, Amal
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This paper aims to derive a definition of complexity for a dynamic spherical system in the background of self-interacting Brans-Dicke gravity. We measure complexity of the structure in terms of inhomogeneous energy density, anisotropic pressure and massive scalar field. For this purpose, we formulate structure scalars by orthogonally splitting the Riemann tensor. We show that self-gravitating models collapsing homologously follow the simplest mode of evolution. Furthermore, we demonstrate the effect of scalar field on the complexity and evolution of non-dissipative as well as dissipative systems. The criteria under which the system deviates from the initial state of zero complexity is also discussed. It is concluded that complexity of the sphere increases in self-interacting Brans-Dicke gravity because the homologous model is not shear-free.
description: 19 pages, no figure
Holography and non-locality in a closed vacuum-dominated universe
Creators: name: Mongan, T. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A closed vacuum-dominated Friedmann universe is asymptotic to a de Sitter space with a cosmological event horizon for any observer. The holographic principle says the area of the horizon in Planck units determines the number of bits of information about the universe that will ever be available to any observer. The wavefunction describing the probability distribution of mass quanta associated with bits of information on the horizon is the boundary condition for the wavefunction specifying the probability distribution of mass quanta throughout the universe. Local interactions between mass quanta in the universe cause quantum transitions in the wavefunction specifying the distribution of mass throughout the universe, with instantaneous non-local effects throughout the universe.
description: 4 pages, no figures, to be published in Int. J. Theor. Phys, references corrected
Centrality determination with a forward detector in the RHIC Beam Energy Scan
Creators: name: Kagamaster, Skipper
name: Reed, Rosi
name: Lisa, Michael
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Recently, Chatterjee et al used a hadronic transport model to estimate the resolution with which various experimental quantities select the impact parameter of relativistic heavy ion collisions at collision energies relevant to the Beam Energy Scan (BES) program at the Relativistic Heavy Ion Collider (RHIC). Measures based on particle multiplicity at forward rapidity were found to be significantly worse than those based on midrapidity multiplicity. Using the same model, we show that a slightly more sophisticated measure greatly improves the resolution based on forward rapidity particles; this improvement persists even when the model is filtered through a realistic simulation of a recent upgrade detector to the STAR experiment. These results highlight the importance of optimizing centrality measures based on particles detected at forward rapidity, especially for experimental studies that search for a critical point in the QCD phase diagram. Such measurements usually focus on proton multiplicity fluctuations at midrapidity, hence selecting events based on multiplicity at midrapidity raises the possibility of nontrivial autocorrelations.
description: 9 pages, 11 figures
Spontaneous parity violation and minimal Higgs models
Creators: name: Chavez, H.
name: Simoes, J. A. Martins
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper we present a model for the spontaneous breaking of parity with two Higgs doublets and two neutral Higgs singlets which are even and odd under D-parity. The condition $ v_R >>v_L $ can be satisfied without introducing bidoublets and it is induced by the breaking of D-parity through the vacuum expectation value of the odd Higgs singlet. Examples of left-right symmetric and mirror fermions models in grand unified theories are presented.
description: Revised version. Accepted in Eur. Phys. Journal C
CharBERT: Character-aware Pre-trained Language Model
Creators: name: Ma, Wentao
name: Cui, Yiming
name: Si, Chenglei
name: Liu, Ting
name: Wang, Shijin
name: Hu, Guoping
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Most pre-trained language models (PLMs) construct word representations at subword level with Byte-Pair Encoding (BPE) or its variations, by which OOV (out-of-vocab) words are almost avoidable. However, those methods split a word into subword units and make the representation incomplete and fragile. In this paper, we propose a character-aware pre-trained language model named CharBERT improving on the previous methods (such as BERT, RoBERTa) to tackle these problems. We first construct the contextual word embedding for each token from the sequential character representations, then fuse the representations of characters and the subword representations by a novel heterogeneous interaction module. We also propose a new pre-training task named NLM (Noisy LM) for unsupervised character representation learning. We evaluate our method on question answering, sequence labeling, and text classification tasks, both on the original datasets and adversarial misspelling test sets. The experimental results show that our method can significantly improve the performance and robustness of PLMs simultaneously. Pretrained models, evaluation sets, and code are available at https://github.com/wtma/CharBERT
description: 12 pages, to appear at COLING 2020
Σχέση παραβατικής συμπεριφοράς και δυσκολιών μάθησης: περιπτώσεις από το Γυμνάσιο του Ειδικού Καταστημάτος Κράτησης Νέων Βόλου (ΕΚΚΝ)
Creators: name: Νάκου, Γεωργία Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Μαθησιακές δυσκολίες
Παραβατικότητα
Σχολική διαρροή
learning difficulties
Delinquent
Dropout

description: Σκοπός της έρευνας είναι μελέτη της σχέσης της παραβατικής συμπεριφοράς και των δυσκολιών μάθησης: περιπτώσεις από το Γυμνάσιο του Ειδικού Καταστημάτoς Κράτησης Νέων Βόλου (ΕΚΚΝ).Οι μαθητές με δυσκολίες μάθησης εμφανίζονται σε δυσανάλογα μεγάλο ποσοστό σε καταστήματα κράτησης ανηλίκων και νέων, σε σχέση με το γενικό πληθυσμό. Η υποεπίδοση στο σχολείο και η μη έγκαιρη κάλυψη των εκπαιδευτικών τους αναγκών μπορεί να τους οδηγήσει εκτός σχολείου, με αποτέλεσμα την εμπλοκή τους σε ομάδες με παραβατική συμπεριφορά. Η εμπλοκή τους σε αυτή τη περίπτωση με τα Δικαστήρια Ανηλίκων και το σωφρονιστικό σύστημα είναι συνήθως η κατάληξη. Όλοι οι μαθητές, που εγκαταλείπουν το σχολείο ή εμφανίζουν υποεπίδοση, δεν εμφανίζουν απαραίτητα παραβατική συμπεριφορά. Είναι πολλοί οι παράγοντες ανθεκτικότητας που μπορούν να αλληλεπιδράσουν και να προστατεύσουν τους μαθητές. Ένας από αυτούς είναι το σχολείο, δηλαδή η εκπαιδευτική πολιτική, οι εκπαιδευτικοί και η αξιολόγηση των μαθητών με στόχο την παροχή ειδικής αγωγής. Οι δίγλωσσοι και μεταναστευτικής προέλευσης μαθητές εμφανίζονται πιο ευάλωτοι στην επίδραση των παραγόντων επικινδυνότητας και συχνά καταλήγουν σε καταστήματα κράτησης, όπως το ΕΚΚΝ Βόλου και φοιτούν σε σχολείο εντός του καταστήματος. Η φτώχια, ως παράγοντας επικινδυνότητας, επηρεάζει από την νεαρή ηλικία τους μαθητές, την ανάπτυξή τους, την ψυχολογία τους, την σχολική τους ετοιμότητα και επίδοση.
description: This paper explores the influence of learning difficulties and disabilities on the participation of youth in the juvenile justice system. Also explores the phenomenon of disproportionately. The underachievement of students and school failure to meet their educational needs, can lead them out of school. As a result occasionally they get involved in groups with delinquent behavior. Their involvement in this case with Juvenile Court is usually the outcome. All underachievement or dropout students not necessarily exhibit delinquent behavior. There are many resistance agents can interact and protect students. One of them is the school, which involves education policy, teachers and pupil assessment so they are provided special education. The bilingual and immigrant origin students appear more vulnerable to the effects of risk factors and often end up in detention facilities, such as the EKKN (juvenile center) of Volos and attending school in prison. Poverty as a risk factor, affects youth of the students, their development, their psychology, their school readiness and performance.
Hybrid colour filters for multispectral imaging
Creators: name: He, Xin
name: Liu, Yajing
name: Beckett, Paul
name: Uddin, MD Hemayet
name: Nirmalathas, Ampalavanapillai
name: Unnithan, Ranjith Rajasekharan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Multispectral cameras capture images in multiple wavelengths in narrow spectral bands. They offer advanced sensing well beyond normal cameras and many single sensor based multispectral cameras have been commercialized aimed at a broad range of applications, such as agroforestry research, medical analysis and so on. However, the existing single sensor based multispectral cameras require accurate alignment to overlay each filter on image sensor pixels, which makes their fabrication very complex, especially when the number of bands is large. This paper demonstrates a new filter technology using a hybrid combination of single plasmonic layer and dielectric layers by computational simulations. A filter mosaic of various bands with narrow spectral width can be achieved with single run manufacturing processes (i.e., exposure, development, deposition and other minor steps), regardless of the number of bands.
On the Formation and Progenitor of PSR J0737-3039: New Constraints on the Supernova Explosion Forming Pulsar B
Creators: name: Willems, B.
name: Kaplan, J.
name: Fragos, T.
name: Kalogera, V.
name: Belczynski, K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We revisit the formation of PSR J0737-3039, taking into account the most recent observational constraints. We show that the most likely kick velocity and progenitor parameters depend strongly on the consideration of the full five-dimensional PDF for the magnitude and direction of the kick velocity imparted to pulsar B at birth, the mass of pulsar B's pre-supernova helium star progenitor, and the pre-supernova orbital separation, and on the adopted prior assumptions. The priors consist of the transverse systemic velocity, the age of the system, and the treatment of the unknown radial velocity. Since the latter cannot be determined from observation, we adopt a statistical approach and use theoretical radial-velocity distributions obtained from population synthesis calculations for coalescing double neutron stars. We find that the prior assumptions about the pre-supernova helium star mass affect the derived most likely parameters significantly: when the minimum helium star mass required for neutron star formation is assumed to be 2.1Msun, the most likely kick velocity ranges from 70-180km/s; when masses lower than 2.1Msun are assumed to allow neutron star formation, the most likely kick velocity can be as low as a few km/s, although the majority of the considered models still yield most likely kick velocities of 50-170km/s. We also show that the proximity of the double pulsar to the Galactic plane and the small proper motion do not pose stringent constraints on the kick velocity and progenitor mass of pulsar B. Instead, the constraints imposed by the orbital dynamics of asymmetric supernova explosions turn out to be much more restrictive. We conclude that the currently available observational constraints cannot be used to favor a specific core-collapse and neutron star formation mechanism. (abridged)
description: Accepted by Physical Review D. Revised version incorporates a detailed rebuttal of the remarks made by Piran & Shaviv in astro-ph/0603649 (see Appendix A) and also minor clarifications requested by an anonymous referee
Physics-Informed Graph-Mesh Networks for PDEs: A hybrid approach for complex problems
Creators: name: Chenaud, Marien
name: Magoulès, Frédéric
name: Alves, José
Publisher: name: arXiv
Year: 2024
Subjects: subject: Numerical Analysis (math.NA)
subject: Machine Learning (cs.LG)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: The recent rise of deep learning has led to numerous applications, including solving partial differential equations using Physics-Informed Neural Networks. This approach has proven highly effective in several academic cases. However, their lack of physical invariances, coupled with other significant weaknesses, such as an inability to handle complex geometries or their lack of generalization capabilities, make them unable to compete with classical numerical solvers in industrial settings. In this work, a limitation regarding the use of automatic differentiation in the context of physics-informed learning is highlighted. A hybrid approach combining physics-informed graph neural networks with numerical kernels from finite elements is introduced. After studying the theoretical properties of our model, we apply it to complex geometries, in two and three dimensions. Our choices are supported by an ablation study, and we evaluate the generalisation capacity of the proposed approach.
Exploring the acceleration of the Met Office NERC Cloud model using FPGAs
Creators: name: Brown, Nick
Publisher: name: arXiv
Year: 2020
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: The use of Field Programmable Gate Arrays (FPGAs) to accelerate computational kernels has the potential to be of great benefit to scientific codes and the HPC community in general. With the recent developments in FPGA programming technology, the ability to port kernels is becoming far more accessible. However, to gain reasonable performance from this technology it is not enough to simple transfer a code onto the FPGA, instead the algorithm must be rethought and recast in a data-flow style to suit the target architecture. In this paper we describe the porting, via HLS, of one of the most computationally intensive kernels of the Met Office NERC Cloud model (MONC), an atmospheric model used by climate and weather researchers, onto an FPGA. We describe in detail the steps taken to adapt the algorithm to make it suitable for the architecture and the impact this has on kernel performance. Using a PCIe mounted FPGA with on-board DRAM, we consider the integration on this kernel within a larger infrastructure and explore the performance characteristics of our approach in contrast to Intel CPUs that are popular in modern HPC machines, over problem sizes involving very large grids. The result of this work is an experience report detailing the challenges faced and lessons learnt in porting this complex computational kernel to FPGAs, as well as exploring the role that FPGAs can play and their fundamental limits in accelerating traditional HPC workloads.
description: Preprint of article in proceedings, ISC High Performance 2019. Lecture Notes in Computer Science, vol 11887
Internal and Collective Properties of Galaxies in the Sloan Digital Sky Survey
Creators: name: Choi, Yun-Young
name: Park, Changbom
name: Vogeley, Michael S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine volume-limited samples from the SDSS galaxies to look for relations among internal and collective physical parameters of galaxies as faint as M_r=- 17.5, which include morphology, luminosity, color, color gradient, concentration, size, velocity dispersion, equivalent width (EW) of H_alpha line,axis ratio, the luminosity and velocity dispersion functions. At fixed morphology and luminosity, we find that bright (M_r100 km/s). We find that passive spirals are well-separated from star-forming late-types at EW (H_alpha) of about 4. An interesting finding is that many physical parameters of galaxies manifest different behaviors across the absolute magnitude of about M_* +- 1. The morphology fraction as a function of luminosity depends less sensitively on large scale structure than the luminosity function (LF) does, and thus seems to be more universal. The effects of internal extinction in late-types on the completeness of volume limited samples and on the LF and morphology fraction are found to be very important. (abridged)
description: typos corrected, matched to the published version. figure 9 and 11 replaced. This version has some additional calculations. The major conclusions are unchanged
Towards Precision Feeding Using Behavioral Monitoring in Marine Cages
Creators: name: Georgopoulou, Dimitra
name: Vouidaskis, Charalabos
name: Papandroulakis, Nikos
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences

description: Aquaculture is expected to account for two-thirds of global fish consumption by 2030, highlighting the need for sustainable and efficient practices. Feeding is crucial to aquaculture success, influenced by factors like fish size, environment, and health. This study addresses a gap in feeding control for sea cages by developing a real-time monitoring system, using AI models and computer vision to analyze feeding behavior with European sea bass as pilot species. Key metrics like fish speed and a new feeding behavior index (FBI) were used to assess responses to different feeding scenarios. The results revealed distinct behavior patterns based on feeding quantity, with imbalances in activity when fish are overfed or underfed. The results can be used for predicting the level of satiation of the fish and controlling feeding duration.
description: 3 pages, 3 figures
Quotients of bounded homogeneous domains by cyclic groups
Creators: name: Miebach, Christian
Publisher: name: arXiv
Year: 2008
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: Let $D$ be a bounded homogeneous domain in $\mbb{C}^n$ and let $Γ$ be a cyclic discrete subgroup of the automorphism group of $D$. It is shown that the complex space $D/Γ$ is Stein.
description: 14 pages. The statement of Proposition 4.6 has been corrected
On The Temporal Evolution of Particle Production in $f(T)$ Gravity
Creators: name: Mandal, Sanjay
name: Sahoo, P. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The thermodynamical study of the universe allow particle production in modified $f(T)$ ($T$ is the torsion scalar) theory of gravity within a flat FLRW framework for line element. The torsion scalar $T$ plays the same role as the Ricci scalar $R$ in the modified theories of gravity. We derived the $f(T)$ gravity models by taking $f(T)$ as the sum of $T$ and an arbitrary function of $T$ with three different arbitrary function. We observe that the particle production describes the accelerated expansion of the universe without a cosmological constant or any unknown "quintessence" component. Also, we discussed the supplementary pressure, particle number density and particle production rate for three cases.
description: MPLA accepted version
Properties of ferroelectric nanodots embedded in a polarizable medium: Atomistic simulations
Creators: name: Prosandeev, S.
name: Bellaiche, L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: An atomistic approach is used to investigate finite-temperature properties of ferroelectric nanodots that are embedded in a polarizable medium. Different phases are predicted, depending on the ferroelectric strengths of the material constituting the dot and of the system forming the medium. In particular, novel states, exhibiting a coexistence between two kinds of order parameters or possessing a peculiar order between dipole vortices of adjacent dots, are discovered. We also discuss the origins of these phases, e.g. depolarizing fields and medium-driven interactions between dots.
description: 2 figures
Integrated Avalanche Photodetectors for Visible Light
Creators: name: Yanikgonul, Salih
name: Leong, Victor
name: Ong, Jun Rong
name: Hu, Ting
name: Png, Ching Eng
name: Krivitsky, Leonid
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Integrated photodetectors are essential components of scalable photonics platforms for quantum and classical applications. However, most efforts in the development of such devices to date have been focused on infrared telecommunications wavelengths. Here, we report the first monolithically integrated avalanche photodetector (APD) for visible light. Our devices are based on a doped silicon rib waveguide with a novel end-fire input coupling to a silicon nitride waveguide. We demonstrate a high gain-bandwidth product of 216 $\pm$ 12 GHz at 20 V reverse bias measured for 685 nm input light, with a low dark current of 0.12 $μ$A . This performance is very competitive when benchmarked against other integrated APDs operating in the infrared range. With CMOS-compatible fabrication and integrability with silicon nitride platforms, our devices are attractive for visible-light photonics applications in sensing and communications.
description: Main text (11 pages, 4 figures, 1 table) + supplementary (6 pages, 5 figures)
You Do (Not) Belong Here: Detecting DPI Evasion Attacks with Context Learning
Creators: name: Zhu, Shitong
name: Li, Shasha
name: Wang, Zhongjie
name: Chen, Xun
name: Qian, Zhiyun
name: Krishnamurthy, Srikanth V.
name: Chan, Kevin S.
name: Swami, Ananthram
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cryptography and Security (cs.CR)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: As Deep Packet Inspection (DPI) middleboxes become increasingly popular, a spectrum of adversarial attacks have emerged with the goal of evading such middleboxes. Many of these attacks exploit discrepancies between the middlebox network protocol implementations, and the more rigorous/complete versions implemented at end hosts. These evasion attacks largely involve subtle manipulations of packets to cause different behaviours at DPI and end hosts, to cloak malicious network traffic that is otherwise detectable. With recent automated discovery, it has become prohibitively challenging to manually curate rules for detecting these manipulations. In this work, we propose CLAP, the first fully-automated, unsupervised ML solution to accurately detect and localize DPI evasion attacks. By learning what we call the packet context, which essentially captures inter-relationships across both (1) different packets in a connection; and (2) different header fields within each packet, from benign traffic traces only, CLAP can detect and pinpoint packets that violate the benign packet contexts (which are the ones that are specially crafted for evasion purposes). Our evaluations with 73 state-of-the-art DPI evasion attacks show that CLAP achieves an Area Under the Receiver Operating Characteristic Curve (AUC-ROC) of 0.963, an Equal Error Rate (EER) of only 0.061 in detection, and an accuracy of 94.6% in localization. These results suggest that CLAP can be a promising tool for thwarting DPI evasion attacks.
description: 12 pages, 12 figures; accepted to ACM CoNEXT 2020
Reconstruction of interacting dark energy models from parameterizations
Creators: name: Rosenfeld, Rogerio
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Models with interacting dark energy can alleviate the cosmic coincidence problem by allowing dark matter and dark energy to evolve in a similar fashion. At a fundamental level, these models are specified by choosing a functional form for the scalar potential and for the interaction term. However, in order to compare to observational data it is usually more convenient to use parameterizations of the dark energy equation of state and the evolution of the dark matter energy density. Once the relevant parameters are fitted it is important to obtain the shape of the fundamental functions. In this paper I show how to reconstruct the scalar potential and the scalar interaction with dark matter from general parameterizations. I give a few examples and show that it is possible for the effective equation of state for the scalar field to cross the phantom barrier when interactions are allowed. I analyze the uncertainties in the reconstructed potential arising from foreseen errors in the estimation of fit parameters and point out that a Yukawa-like linear interaction results from a simple parameterization of the coupling.
description: 6 pages, 8 figures
Καραμανλήδες Εκκλησιαστικοί Λόγιοι και η συμβολή τους στο κολλυβαδικό ζήτημα
Creators: name: Χριστοδούλου, Γεωργία Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Κολλυβάδες
Τουρκόφωνοι
Καραμανλήδικα
Μικρά Ασία
Καππαδοκία
Φιλοκαλία
Διαφωτισμός
Collybades
Turskish-speaking
Karamanlidika
Asia Minor
Cappadocia
Philocalia
Enligthenment

description: Ρωμιοί τουρκόφωνοι (Καραμανλήδες) λόγιοι εκκλησιαστικοί άνδρες εντοπίζονται από τα μέσα του ιη΄ έως τις αρχές του ιθ΄ αι. τόσο στην αθωνική χερσόνησο, όσο στα νησιά του Αιγαίου, στα μικρασιατικά παράλια αλλά και σε αυτήν την ίδια την μικρασιατική ενδοχώρα. Οι τουρκόφωνοι αυτοί λόγιοι, συντασσόμενοι στο πλευρό των Κολλυβάδων πατέρων, συγκροτούν ένα δίκτυο προσώπων, η δράση των οποίων λειτουργεί σε πολλαπλά επίπεδα. Αφ’ ενός, το αντιγραφικό τους έργο στο χώρο της ασκητικής γραμματείας των μεγάλων νηπτικών της ορθόδοξης Ανατολής από δ΄ έως ιδ΄ αι. αποτελεί πρόδρομο της Φιλοκαλικής Αναγέννησης που θεμελιώθηκε από τους πατέρες της Φιλοκαλίας (αγίους Μακάριο Κορίνθου, Νικόδημο Αγιορείτη και Παΐσιο Βελιτσκόφσκι). Αφ’ ετέρου, το δίκτυο αυτό επέδειξε μεταφραστικό και εκδοτικό της κολλυβαδικής γραμματείας έργο, καθώς και εκτεταμένη κηρυκτική και διδακτική δραστηριότητα, πρεσβεύοντας την διατήρηση της ορθόδοξης εκκλησιαστικής τάξης και παράδοσης. Με τον τρόπο αυτό, το εν λόγω δίκτυο λειτούργησε αφυπνιστικά για τον τουρκόφωνο Ελληνισμό της Ανατολής, ο οποίος σταδιακά υποχρεώθηκε νά έρθει αντιμέτωπος με το προελαύνον μέχρι τα βάθη της μικρασιατικής ενδοχώρας νεωτερικό ρεύμα του Διαφωτισμού.
description: Turkish-speaking ecclesiastic scholars from Roman Anatolia (Karamanlides) are situated in the Athos peninsula, in the Aegean islands, not only on the coasts but also in the mainland of Asia Minor peninsula, at the end of XVIIIth and the beginning of XIXth century. These turkish-speaking scholars, in accord with the ecclesiastic tradition advocated by the Collybades, constitute a network of persons whose action operates in multiple levels. On the one hand, their copying task of orthodox ascetic litterature of IVth to XIVth century, constituted a precursor of the Renessance of Philocalia, founded by the saint fathers of Philocalia (Makarios Notaras, Nicodemus the Hagiorite, Paїsius Velichkovsky). On the other hand, these scholars’ network demonstrated a work of translation and publication of Collybades’ litterature and a broad action of preaching and teaching, advocating the maintenance of the orthodox ecclesiastic status and tradition. Thereby, their work awakened the turkish-speaking Hellenism of Anatolia, who gradually had to confront the new wave of Enlightenment.
Birkhoff type decompositions and the Baker-Campbell-Hausdorff recursion
Creators: name: Ebrahimi-Fard, K.
name: Guo, L.
name: Manchon, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We describe a unification of several apparently unrelated factorizations arisen from quantum field theory, vertex operator algebras, combinatorics and numerical methods in differential equations. The unification is given by a Birkhoff type decomposition that was obtained from the Baker-Campbell-Hausdorff formula in our study of the Hopf algebra approach of Connes and Kreimer to renormalization in perturbative quantum field theory. There we showed that the Birkhoff decomposition of Connes and Kreimer can be obtained from a certain Baker-Campbell-Hausdorff recursion formula in the presence of a Rota-Baxter operator. We will explain how the same decomposition generalizes the factorization of formal exponentials and uniformization for Lie algebras that arose in vertex operator algebra and conformal field theory, and the even-odd decomposition of combinatorial Hopf algebra characters as well as to the Lie algebra polar decomposition as used in the context of the approximation of matrix exponentials in ordinary differential equations.
description: accepted for publication in Comm. in Math. Phys
LinkThief: Combining Generalized Structure Knowledge with Node Similarity for Link Stealing Attack against GNN
Creators: name: Zhang, Yuxing
name: Meng, Siyuan
name: Chen, Chunchun
name: Peng, Mengyao
name: Gu, Hongyan
name: Huang, Xinli
Publisher: name: arXiv
Year: 2024
Subjects: subject: Cryptography and Security (cs.CR)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Graph neural networks(GNNs) have a wide range of applications in multimedia.Recent studies have shown that Graph neural networks(GNNs) are vulnerable to link stealing attacks,which infers the existence of edges in the target GNN's training graph.Existing attacks are usually based on the assumption that links exist between two nodes that share similar posteriors;however,they fail to focus on links that do not hold under this assumption.To this end,we propose LinkThief,an improved link stealing attack that combines generalized structure knowledge with node similarity,in a scenario where the attackers' background knowledge contains partially leaked target graph and shadow graph.Specifically,to equip the attack model with insights into the link structure spanning both the shadow graph and the target graph,we introduce the idea of creating a Shadow-Target Bridge Graph and extracting edge subgraph structure features from it.Through theoretical analysis from the perspective of privacy theft,we first explore how to implement the aforementioned ideas.Building upon the findings,we design the Bridge Graph Generator to construct the Shadow-Target Bridge Graph.Then,the subgraph around the link is sampled by the Edge Subgraph Preparation Module.Finally,the Edge Structure Feature Extractor is designed to obtain generalized structure knowledge,which is combined with node similarity to form the features provided to the attack model.Extensive experiments validate the correctness of theoretical analysis and demonstrate that LinkThief still effectively steals links without extra assumptions.
Kallen-Lehman approach to 3D Ising model
Creators: name: Canfora, Fabrizio
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A "Kallen-Lehman" approach to Ising model, inspired by quantum field theory a la Regge, is proposed. The analogy with the Kallen-Lehman representation leads to a formula for the free-energy of the 3D model with few free parameters which could be matched with the numerical data. The possible application of this scheme to the spin glass case is shortly discussed.
description: 13 pages no figures. Accepted for pubblication on Physics Letters B
It's all about data movement: Optimising FPGA data access to boost performance
Creators: name: Brown, Nick
name: Dolman, David
Publisher: name: arXiv
Year: 2020
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: The use of reconfigurable computing, and FPGAs in particular, to accelerate computational kernels has the potential to be of great benefit to scientific codes and the HPC community in general. However, whilst recent advanced in FPGA tooling have made the physical act of programming reconfigurable architectures much more accessible, in order to gain good performance the entire algorithm must be rethought and recast in a dataflow style. Reducing the cost of data movement for all computing devices is critically important, and in this paper we explore the most appropriate techniques for FPGAs. We do this by describing the optimisation of an existing FPGA implementation of an atmospheric model's advection scheme. By taking an FPGA code that was over four times slower than running on the CPU, mainly due to data movement overhead, we describe the profiling and optimisation strategies adopted to significantly reduce the runtime and bring the performance of our FPGA kernels to a much more practical level for real-world use. The result of this work is a set of techniques, steps, and lessons learnt that we have found significantly improves the performance of FPGA based HPC codes and that others can adopt in their own codes to achieve similar results.
description: Preprint of article in 2019 IEEE/ACM International Workshop on Heterogeneous High-performance Reconfigurable Computing (H2RC)