cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Accountable Trust Decisions: A Semantic Approach
Creators: name: Schlichtkrull, Anders
name: Mödersheim, Sebastian
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2020
Subjects: subject: Trust policies
subject: Accountability
subject: Security
subject: Logic
subject: Theorem Prover
subject: Isabelle
subject: eIDAS

description: This paper is concerned with the question of how to obtain the highest possible assurance on trust policy decisions: when accepting an electronic transaction of substantial value or significant implications, we want to be sure that this did not happen because of a bug in a policy checker. Potential bugs include bugs in parsing documents, in signature checking, in checking trust lists, and in the logical evaluation of the policy. This paper focuses on the latter kind of problems and our idea is to validate the logical steps of the trust decision by another, complementary method. We have implemented this for the Trust Policy Language of the LIGHTest project and we use the completely independently developed FOL theorem prover RP_X as a complementary method.
Supergravity Black Holes, Love Numbers and Harmonic Coordinates
Creators: name: Cvetic, M.
name: Gibbons, G. W.
name: Pope, C. N.
name: Whiting, B. F.
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: To perform realistic tests of theories of gravity, we need to be able to look beyond general relativity and evaluate the consistency of alternative theories with observational data from, especially, gravitational wave detections using, for example, an agnostic Bayesian approach. In this paper we further examine properties of one class of such viable, alternative theories, based on metrics arising from ungauged supergravity. In particular, we examine the massless, neutral, minimally coupled scalar wave equation in a general stationary, axisymmetric background metric such as that of a charged rotating black hole, when the scalar field is either time independent or in the low-frequency, near-zone limit, with a view to calculating the Love numbers of tidal perturbations, and of obtaining harmonic coordinates for the background metric. For a four-parameter family of charged asymptotically flat rotating black hole solutions of ungauged supergravity theory known as STU black holes, which includes Kaluza-Klein black holes and the Kerr-Sen black hole as special cases, we find that all time-independent solutions, and hence the harmonic coordinates of the metrics, are identical to those of the Kerr solution. In the low-frequency limit we find the scalar fields exhibit the same $SL(2,R)$ symmetry as holds in the case of the Kerr solution. We point out extensions of our results to a wider class of metrics, which includes solutions of Einstein-Maxwell-Dilaton theory.
description: 21 pages. Typos correct, text added
title: Consumer Privacy Concerns and Preferences for Certification and Accreditation of Intelligent Assistants in the Internet of Things
Creators: name: Carl, Valerie
name: Mihale-Wilson, A. Cristina
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2020
Subjects: subject: Internet of Things
subject: Intelligent Assistant Systems
subject: certification and accreditation
subject: privacy concerns

description: Interoperable Intelligent Assistant Systems (IAS) could help realize the advantages of the Internet of Things (IoT). Yet, due to their insufficient skill set and persistent privacy concerns on the consumers' side, such IAS experience only limited popularity. While enabling IAS to communicate and exchange data with each other could help such systems improve performance, certifications and accreditations can help build user's trust by addressing some of the consumers' privacy concerns. To better understand the incentives necessary to instigate the mass adoption of interoperable IAS, this paper presents a study exploring consumer privacy concerns and preferences for privacy certifications. The ultimate purpose of this paper is to provide certification recommendations for intelligent IoT networks in general and IAS in particular.
Quasi-periodic Eruptions from Helium Envelope of Hydrogen-deficient Stars Stripped by Supermassive Black Holes
Creators: name: Zhao, Z. Y.
name: Wang, Y. Y.
name: Zou, Y. C.
name: Wang, F. Y.
name: Dai, Z. G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Quasi-periodic eruptions (QPEs), which are a new kind of X-ray bursts with a recurrence time of several hours, have been detected from supermassive black holes (SMBHs) in galactic nuclei. Recently, the two QPEs discovered by the \textit{eROSITA} show asymmetric light curves with a fast rise and a slow decline. Current models cannot explain the observational characteristics of QPEs. Here we show that QPEs can be generated from the Roche lobe overflows at each periapsis passage of an evolved star orbiting an SMBH. The properties of the companion stars are constrained via analytic estimations. We find that hydrogen-deficient post-AGB stars are promising candidates. Modules for Experiments in Stellar Astrophysics (MESA) stellar evolution code is used to construct the hydrogen-deficient stars which can fulfill the requirements, as obtained through analytical estimates, to produce the properties of QPEs, including the fast-rise and slow-decay light curves, periods, energetics, and rates. Furthermore, the extreme mass ratio $\sim 10^5$ between the SMBH and the donor will lead to a phenomenon called extreme mass-ratio inspiral (EMRI), producing millihertz gravitational waves. These QPEs would be detected as EMRI sources with electromagnetic counterparts for space-based GW detectors, such as Laser Interferometer Space Antenna (LISA) and Tianqin. They would provide a new way to measure the Hubble constant and further test the Hubble constant tension.
description: 9 pages, 6 figures, 3 tables, accepted for publication in A&A
Integrated and Adaptive Guidance and Control for Endoatmospheric Missiles via Reinforcement Learning
Creators: name: Gaudet, Brian
name: Furfaro, Roberto
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: Robotics (cs.RO)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: We apply a reinforcement meta-learning framework to optimize an integrated and adaptive guidance and flight control system for an air-to-air missile. The system is implemented as a policy that maps navigation system outputs directly to commanded rates of change for the missile's control surface deflections. The system induces intercept trajectories against a maneuvering target that satisfy control constraints on fin deflection angles, and path constraints on look angle and load. We test the optimized system in a six degrees-of-freedom simulator that includes a non-linear radome model and a strapdown seeker model, and demonstrate that the system adapts to both a large flight envelope and off-nominal flight conditions including perturbation of aerodynamic coefficient parameters and center of pressure locations, and flexible body dynamics. Moreover, we find that the system is robust to the parasitic attitude loop induced by radome refraction and imperfect seeker stabilization. We compare our system's performance to a longitudinal model of proportional navigation coupled with a three loop autopilot, and find that our system outperforms this benchmark by a large margin. Additional experiments investigate the impact of removing the recurrent layer from the policy and value function networks, performance with an infrared seeker, and flexible body dynamics.
description: Preprint for 2023 Scitech GN&C submission
The effect of nocturnal wear of complete dentures on sleep and oral health related quality of life : study protocol for a randomized controlled trial
Creators: name: Emami, Elham
name: Nguyen, Phan T. H.
name: Almeida, Fernanda
name: Feine, Jocelyne S.
name: Karp, Igor
name: Lavigne, Gilles
name: Huynh, Nelly
Publisher: name: BioMed Central
Year: 2016

description: Background: Edentulism and sleep disturbance are chronic conditions that are common in older people and have serious adverse consequences for their functioning and quality of life. Edentulism can disturb sleep through the alteration of the craniofacial structure and surrounding soft tissue. However, the effect of prosthetic rehabilitation of edentulism on sleep quality is still not well understood. The objectives of this study are to test whether nocturnal denture wear affects sleep quality, daytime sleepiness, and the oral health related quality of life of edentate older people with moderate to severe sleep apnea, and to identify modifiers of effect of nocturnal denture wear. Methods/design: We will carry out a single-blind randomized cross-over trial. Seventy edentate older people with moderate to severe obstructive sleep apnea will be enrolled. The study participants will be assigned to wear and not wear their dentures on alternate periods of 30 days. The outcome measures will be sleep quality (assessed by portable polysomnography), daytime sleepiness (assessed by the Epworth Sleepiness Scale), and oral health related quality of life (assessed by validated questionnaire). A number of characteristics (sociodemographic, oropharyngeal morphology, oral and prosthesis characteristics, and perceived general health quality of life) will be assessed by means of clinical examination, 3D imaging of the craniofacial structure, and validated questionnaires at baseline. Linear mixed effects regression models for repeated measures will be fitted to test the study hypotheses. The main analyses will be based on the intention-to-treat principle. To assess the robustness of the findings to potential incomplete adherence, sensitivity analyses will be conducted while applying the per-protocol principle. Discussion: This practice-relevant evidence could represent a preventive approach to improve sleep characteristics of the older population and improve their well-being and quality of life. Trial registration: ClinicalTrials.gov NCT01868295 .
Linear seesaw model with a modular $S_4$ flavor symmetry
Creators: name: Nomura, Takaaki
name: Okada, Hiroshi
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss a linear seesaw model with as minimum field content as possible, introducing a modular $S_4$ with the help of gauged $U(1)_{B-L}$ symmetries. Due to rank two neutrino mass matrix, we have a vanishing neutrino mass eigenvalue, and only the normal mass hierarchy of neutrinos is favored through the modular $S_4$ symmetry. In our numerical $Δχ^2$ analysis, we especially find rather sharp prediction on sum of neutrino masses to be around $60$ meV in addition to the other predictions.
description: 21 pages, two tables, three figures; version accepted for publication in Chinese Physics C
5-mehtyltetrahydrofolate rescues alcohol-induced neural crest cell migration abnormalities
Creators: name: Shi, Yu
name: Li, Jiejing
name: Chen, Chunjiang
name: Gong, Manzi
name: Chen, Yuan
name: Liu, Youxue
name: Chen, Jie
name: Li, Tingyu
name: Song, Weihong
Publisher: name: BioMed Central
Year: 2016

description: Background: Alcohol is detrimental to early development. Fetal alcohol spectrum disorders (FASD) due to maternal alcohol abuse results in a series of developmental abnormalities including cranial facial dysmorphology, ocular anomalies, congenital heart defects, microcephaly and intellectual disabilities. Previous studies have been shown that ethanol exposure causes neural crest (NC) apoptosis and perturbation of neural crest migration. However, the underlying mechanism remains elusive. In this report we investigated the fetal effect of alcohol on the process of neural crest development in the Xenopus leavis. Results: Pre-gastrulation exposure of 2-4% alcohol induces apoptosis in Xenopus embryo whereas 1% alcohol specifically impairs neural crest migration without observing discernible apoptosis. Additionally, 1% alcohol treatment considerably increased the phenotype of small head (43.4% ± 4.4%, total embryo n = 234), and 1.5% and 2.0% dramatically augment the deformation to 81.2% ± 6.5% (n = 205) and 91.6% ± 3.0% (n = 235), respectively (P < 0.05). Significant accumulation of Homocysteine was caused by alcohol treatment in embryos and 5-mehtyltetrahydrofolate restores neural crest migration and alleviates homocysteine accumulation, resulting in inhibition of the alcohol-induced neurocristopathies. Conclusions: Our study demonstrates that prenatal alcohol exposure causes neural crest cell migration abnormality and 5-mehtyltetrahydrofolate could be beneficial for treating FASD.
6MapNet: Representing soccer players from tracking data by a triplet network
Creators: name: Kim, Hyunsung
name: Kim, Jihun
name: Chung, Dongwook
name: Lee, Jonghyun
name: Yoon, Jinsung
name: Ko, Sang-Ki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Although the values of individual soccer players have become astronomical, subjective judgments still play a big part in the player analysis. Recently, there have been new attempts to quantitatively grasp players' styles using video-based event stream data. However, they have some limitations in scalability due to high annotation costs and sparsity of event stream data. In this paper, we build a triplet network named 6MapNet that can effectively capture the movement styles of players using in-game GPS data. Without any annotation of soccer-specific actions, we use players' locations and velocities to generate two types of heatmaps. Our subnetworks then map these heatmap pairs into feature vectors whose similarity corresponds to the actual similarity of playing styles. The experimental results show that players can be accurately identified with only a small number of matches by our method.
description: 12 pages, 4 figures, In 8th Workshop on Machine Learning and Data Mining for Sports Analytics (MLSA21)
Space-and-time-synchronized simultaneous vehicle tracking/formation using cascaded prescribed-time control
Creators: name: Wang, Peng
name: Chen, Ziyin
name: Zhang, Xiaobing
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we present a space-and-time-synchronized control method with application to the simultaneous tracking/formation. In the framework of polar coordinates, through correlating and decoupling the reference/actual kinematics between the self vehicle and target, time and space are separated, controlled independently. As such, the specified state can be achieved at the predetermined terminal time, meanwhile, the relative trajectory in space is independent of time. In addition, for the stabilization before the predesigned time, a cascaded prescribed-time control theorem is provided as the preliminary of vehicle tracking control. The obtained results can be directly extended to the simultaneous tracking/formation of multiple vehicles. Finally, numerical examples are provided to verify the effectiveness and superiority of the proposed scheme.
description: 10 pages, 5 figures. International Journal of Robust and Nonlinear Control 2022
Scaling of Entropy Production under Coarse Graining in Active Disordered Media
Creators: name: Cocconi, Luca
name: Salbreux, Guillaume
name: Pruessner, Gunnar
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Entropy production plays a fundamental role in the study of non-equilibrium systems by offering a quantitative handle on the degree of time-reversal symmetry breaking. It depends crucially on the degree of freedom considered as well as on the scale of description. It was hitherto unknown how the entropy production at one resolution of the degrees of freedom is related to the entropy production at another resolution. This relationship is of particular relevance to coarse grained and continuum descriptions of a given phenomenon. In this work, we derive the scaling of the entropy production under iterative coarse graining on the basis of the correlations of the underlying microscopic transition rates. Our approach unveils a natural criterion to distinguish equilibrium-like and genuinely non-equilibrium macroscopic phenomena based on the sign of the scaling exponent of the entropy production per mesostate.
description: 21 pages, 6 figures
Inhomogeneous quantum quenches in the sine-Gordon theory
Creators: name: Horváth, D. X.
name: Kormos, M.
name: Sotiriadis, S.
name: Takács, G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study inhomogeneous quantum quenches in the attractive regime of the sine-Gordon model. In our protocol, the system is prepared in an inhomogeneous initial state in finite volume by coupling the topological charge density operator to a Gaussian external field. After switching off the external field, the subsequent time evolution is governed by the homogeneous sine-Gordon Hamiltonian. Varying either the interaction strength of the sine-Gordon model or the amplitude of the external source field, an interesting transition is observed in the expectation value of the soliton density. This affects both the initial profile of the density and its time evolution and can be summarised as a steep transition between behaviours reminiscent of the Klein-Gordon, and the free massive Dirac fermion theory with initial external fields of high enough magnitude. The transition in the initial state is also displayed by the classical sine-Gordon theory and hence can be understood by semi-classical considerations in terms of the presence of small amplitude field configurations and the appearance of soliton excitations, which are naturally associated with bosonic and fermionic excitations on the quantum level, respectively. Features of the quantum dynamics are also consistent with this correspondence and comparing them to the classical evolution of the density profile reveals that quantum effects become markedly pronounced during the time evolution. These results suggest a crossover between the dominance of bosonic and fermionic degrees of freedom whose precise identification in terms of the fundamental particle excitations can be rather non-trivial. Nevertheless, their interplay is expected to influence the sine-Gordon dynamics in arbitrary inhomogeneous settings.
description: 26+18 pages, 12+4 figures
Time Series Path Integral Expansions for Stochastic Processes
Creators: name: Greenman, Chris D
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A form of time series path integral expansion is provided that enables both analytic and numerical temporal effect calculations for a range of stochastic processes. Birth-death processes with linear rates are analysed via coherent state Doi-Peliti techniques. The $\mathfrak{su}(1,1)$ Lie algebra is utilised to capture quadratic rate birth-death processes. The techniques are also adapted to diffusion processes. All methods rely on finding a suitable reproducing kernel associated with the underlying algebra to perform the expansion. The resulting series differ from those found in standard Dyson time series field theory techniques.
description: 21 Pages, 2 Figures
Semantics of European poetry is shaped by conservative forces: The relationship between poetic meter and meaning in accentual-syllabic verse
Creators: name: Šeļa, Artjoms
name: Plecháč, Petr
name: Lassche, Alie
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Recent advances in cultural analytics and large-scale computational studies of art, literature and film often show that long-term change in the features of artistic works happens gradually. These findings suggest that conservative forces that shape creative domains might be underestimated. To this end, we provide the first large-scale formal evidence of the persistent association between poetic meter and semantics in 18-19th European literatures, using Czech, German and Russian collections with additional data from English poetry and early modern Dutch songs. Our study traces this association through a series of clustering experiments using the abstracted semantic features of 150,000 poems. With the aid of topic modeling we infer semantic features for individual poems. Texts were also lexically simplified across collections to increase generalizability and decrease the sparseness of word frequency distributions. Topics alone enable recognition of the meters in each observed language, as may be seen from highly robust clustering of same-meter samples (median Adjusted Rand Index between 0.48 and 1). In addition, this study shows that the strength of the association between form and meaning tends to decrease over time. This may reflect a shift in aesthetic conventions between the 18th and 19th centuries as individual innovation was increasingly favored in literature. Despite this decline, it remains possible to recognize semantics of the meters from past or future, which suggests the continuity of semantic traditions while also revealing the historical variability of conditions across languages. This paper argues that distinct metrical forms, which are often copied in a language over centuries, also maintain long-term semantic inertia in poetry. Our findings, thus, highlight the role of the formal features of cultural items in influencing the pace and shape of cultural evolution.
title: The Monkey's Mask: Identity, Memory, Narrative, Voice
Creators: name: Kearney, Christopher
Publisher: name: Goldsmiths, University of London
Year: 2001

description: This thesis is a largely ethnographic analysis of the life histories of six bilingual, second generation settlers in Britain, from different language communities. All have been academically successful within the English educational system ie all possess at least a first degree from a British university. In the thesis I analyse common patterns in their experiences and chart the complex changes to their view of their own identities. From this I am attempting to trace common patterns in identity formation in complex and plural societies. Following phenomenographic approaches, I conducted a series of unstructured 'interviews' or dialogues, which concentrated on the individuals' views of their own histories and identities. These consisted of anecdotes and vignettes of what they considered as significant episodes from their lives. Each narrative is contextualised within patterns of migration and settlement of their particular 'community'. They are also located within the broader context of the political and social conditions in Britain throughout the time of their parents' settlement and their own lives. Moreover, they are set against the changing background of legislation and public policy in Britain, particularly educational initiatives in the area of multiculturalism, anti racism and multilingualism. I use three levels of analysis: the identification of common patterns and discontinuities, analysis of the process of identity formation and analysis of the cultural aspects of narrative style. Using such analyses I attempt to 'unriddle' the process of identity formation and discuss this against the existing literature on culture and identity. For this I draw on work in the fields of ethnography, literature, cultural studies and social psychology. I argue that there is a need for more complex theoretical conceptions than are currently employed. In the final chapter I consider the implications of the research in the light of recent educational policy in Britain.
"Comparer des jeux et jouets de l'antiquité gréco-romaine avec des jeux et jouets traditionnels du monde rural nord-africain", Organisation ERC Locus Ludi, Images en jeu: réception et transferts, Université de Fribourg 24-25.10.2019
Creators: name: Rossie Jean-Pierre, Membre associé de Locus Ludi
Publisher: name: Zenodo
Year: 2019
Subjects: Antiquité, Monde Contemporaine, Grèce, Afrique du Nord, transmission

description: Est-il possible et utile de comparer les cultures ludiques tangibles et intangibles de l’antiquité gréco-romaine et du monde rural nord-africain et saharien, deux mondes séparés par tant de siècles et différenciés par des milieux naturels et humains, des croyances, des coutumes et des organisations sociales spécifiques ? En élaborant ce document de travail je suis parti de l’hypothèse que cela pourrait être possible et suite à l’analyse des différences et similarités des jeux et jouets et de leur contexte matériel et socio-culturel j’ai remarqué plusieurs affinités tant dans leurs descriptions littéraires que dans les images
SMART-Plant_Recovery of Volatile Fatty Acids from cellulosic sludge to enhance phosphorus bio-uptake or PHA production
Creators: name: A. Cherubin
name: N. Frison
name: A. L. Eusebi
name: F. Fatone
Publisher: name: Zenodo
Year: 2020

description: Outline
 •
 The Horizon2020 SMART Plant Innovation Action
 •
 Cellulose in wastewater and recovery/ reuse routes
 •
 Fermentation for Volatile fatty Acids recovery for
 •
 Biopolymers (PHB coPHV ) production
 •
 Enhanced BioP recovery
 •
 What comes next : scale up to demo and full scale in
 real environment
On the Stokes-type resolvent problem associated with time-periodic flow around a rotating obstacle
Creators: name: Eiter, Thomas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 76D07, 76U05, 47A10, 35B10, 76D05, 35Q30

description: Consider the resolvent problem associated with the linearized viscous flow around a rotating body. Within a setting of classical Sobolev spaces, this problem is not well posed on the whole imaginary axis. Therefore, a framework of homogeneous Sobolev spaces is introduced where existence of a unique solution can be guaranteed for every purely imaginary resolvent parameter. For this purpose, the problem is reduced to an auxiliary problem, which is studied by means of Fourier analytic tools in a group setting. In the end, uniform resolvent estimates can be derived, which lead to the existence of solutions to the associated time-periodic linear problem.
HIV, drugs and the legal environment
Creators: name: Strathdee, Steffanie A.
name: Beletsky, Leo
name: Kerr, Thomas
Publisher: name: The University of British Columbia
Year: 2017

description: A large body of scientific evidence indicates that policies based solely on law enforcement without taking into account public health and human rights considerations increase the health risks of people who inject drugs (PWIDs) and their communities. Although formal laws are an important component of the legal environment supporting harm reduction, it is the enforcement of the law that affects PWIDs' behavior and attitudes most acutely. This commentary focuses primarily on drug policies and policing practices that increase PWIDs' risk of acquiring HIV and viral hepatitis, and avenues for intervention. Policy and legal reforms that promote public health over the criminalization of drug use and PWID are urgently needed. This should include alternative regulatory frameworks for illicit drug possession and use. Changing legal norms and improving law enforcement responses to drug-related harms requires partnerships that are broader than the necessary bridges between criminal justice and public health sectors. HIV prevention efforts must partner with wider initiatives that seek to improve police professionalism, accountability, and transparency and boost the rule of law. Public health and criminal justice professionals can work synergistically to shift the legal environment away from one that exacerbates HIV risks to one that promotes safe and healthy communities.
Chiral states in coupled-lasers lattice by on-site complex potential
Creators: name: Gadasi, Sagie
name: Arwas, Geva
name: Gershenzon, Igor
name: Friesem, Asher
name: Davidson, Nir
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The ability to control the chirality of physical devices is of great scientific and technological importance, from investigations of topologically protected edge states in condensed matter systems to wavefront engineering, isolation, and unidirectional communication. When dealing with large networks of oscillators, the control over the chirality of the bulk states becomes significantly more complicated and requires complex apparatus for generating asymmetric coupling or artificial gauge fields. Here we present a new approach for precise control over the chirality of a triangular array of hundreds of symmetrically-coupled lasers, by introducing a weak non-Hermitian complex potential, requiring only local on-site control of loss and frequency. In the unperturbed network, lasing states with opposite chirality (staggered vortex and staggered anti-vortex) are equally probable. We show that by tuning the complex potential to an exceptional point, a nearly pure chiral lasing state is achieved. While our approach is applicable to any oscillators network, we demonstrate how the inherent non-linearity of the lasers effectively pulls the network to the exceptional point, making the chirality extremely resilient against noises and imperfections.
A Descriptive Account of an Inter-Professional Collaborative Leadership Project
Creators: name: MacPhee, Maura
name: Chang, Li-Lu
name: Havaei, Farinaz
name: Chou, Wen-Shan
Publisher: name: Multidisciplinary Digital Publishing Institute
Year: 2019

description: A collaborative project between an academic healthcare faculty and a professional development director resulted in the design, delivery and evaluation of an inter-professional collaborative leadership workshop with ongoing leadership development activities. The workshop attendees were five inter-professional teams from one large, urban cancer care center in Taipei, Taiwan. The workshop included didactic instruction complemented with team discussions and interactive exercises. Continued practice was encouraged, such as appreciative inquiry exercises and rotated team leadership. Evaluation involved the use of a cross-culturally validated collaborative practice tool and follow-up interviews and focus groups. Although the formal workshop was a 1-day session, continued organizational support and systematic approaches to collaborative leadership practice in clinical settings were necessary components for transfer of learning from the workshop to real life. This paper will include an overview of the foundational leadership concepts covered in the workshop. The instructional strategies, evaluation methods and outcomes will be discussed. The limitations and strengths of this collaborative leadership project will be provided, as well as future plans for a collaborative leadership development program.
X-ray Flux and Spectral Variability of the Blazar OJ 287 with Suzaku
Creators: name: Zhou, Dongtao
name: Zhang, Zhongli
name: Gupta, Alok C.
name: Kushwaha, Pankaj
name: Wiita, Paul J.
name: Gu, Minfeng
name: Xu, Haiguang
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present analyses of Suzaku XIS light curves and spectra of the BL Lac object OJ 287 with observations positioned primarily around proposed recurrent optical outbursts. The first two observations were performed in 2007 April 10 - 13 (epoch 1) and 2007 November 7 - 9 (epoch 2) that respectively correspond to a low and a high optical state and which, within the binary supermassive black hole model for OJ 287, precede and follow the impact flare. The last three observations, made consecutively during 2015 May 3 - 9 (epoch 3), were during the post-impact state of the 2013 disc impact and are the longest continuous X-ray observation of OJ 287 taken before the optical outburst in 2015 December. Intraday variability is found in both the soft (0.5 - 2 keV) and hard (2 - 10 keV) bands. The discrete correction function analysis of the light curves in both bands peaks at zero lag during epochs 2 and 3, indicating that the emission in both bands was cospatial and emitted from the same population of leptons. Power spectral densities of all three light curves are red noise dominated, with a rather wide range of power spectrum slopes. These X-ray spectra are overall consistent with power-laws but with significantly different spectral indices. In the 2015 observations the X-ray spectrum softens during the flare, showing an obvious soft X-ray excess that was not evident in the 2007 observations. We discuss the implications of these observations on the jet, the possible accretion disc, and the binary supermassive black hole model proposed for the nearly periodic optical flaring of OJ 287.
description: 15 pages,9 figures,9 tables
title: Identification collapse - contingency in Identity Management
Creators: name: Fritsch, Lothar
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2020
Subjects: subject: identity management
subject: business continuity
subject: cybersecurity
subject: contingency management

description: Identity management (IdM) facilitates identification, authentication and authorization in most digital processes that involve humans. Digital services as well as work processes, customer relationship management, telecommunications and payment systems rely on forms of IdM. IdM is a business-critical infrastructure. Organizations rely on one specific IdM technology chosen to fit a certain context. Registration, credential issuance and deployment of digital identities are then bound to the chosen technology. What happens if that technology is disrupted? This article discusses consequences and mitigation strategies for identification collapse based on case studies and literature search. The result is a surprising shortage of available documented mitigation and recovery strategies for identification collapse.
title: Self-sovereign and Decentralized identity as the future of identity management?
Creators: name: Kubach, Michael
name: Schunck, Christian H.
name: Sellung, Rachelle
name: Roßnagel, Heiko
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2020
Subjects: subject: Self-sovereign identity
subject: Decentralized identity
subject: identity management
subject: IT-security
subject: privacy
subject: blockchain
subject: distributed ledger

description: Blockchain-based Self-sovereign and Decentralized identity approaches are seen by many as the future of identity management. These solutions are supposed to finally bring universally usable, trustworthy, secure, and privacy friendly digital identities for everyone and all use cases. This paper first presents the promises of this technological app
Effect of head wear on rail underhead radius stresses and fracture under high axle load conditions
Creators: name: Ranjha, Sagheer
Publisher: name: Swinburne
Year: 2024

description: A rail can fail by either wear (loss of profile) or by rolling contact fatigue (RCF) (surface cracks growing by fatigue which may cause a rail break) and requires replacing. The aim of my doctorate research has been to investigate the parameters that affect multi-axial fatigue and fracture behaviour of the rail underhead radius influenced by wear in heavy haul operation. The numerical analyses were performed using the newly developed “User supplied subroutines” (UVAR-M) programmed in FORTRAN-Code and also Extended finite element method (X-FEM) modelling in commercial code ABAQUS 6.11-2. My research has been based on field measurements conducted for rails in heavy haul iron ore operations in Pilbara region of Western Australia. The results of this thesis can be used to examine the influence of wheel-rail interaction behaviour and rail wear on the possibility of a catastrophic rail failure developing from RCF damage.
title: Identity Management as a target in cyberwar
Creators: name: Fritsch, Lothar
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2020
Subjects: subject: Identity management
subject: Cyberwar
subject: Cyber conflict
subject: Digital identities
subject: Information Privacy
subject: Critical Infrastructure Protection
subject: Security
subject: Cyberconflict
subject: Cybersecurity

description: This article will discuss Identity Management (IdM) and digital identities in the context of cyberwar. Cyberattacks that target or exploit digital identities in this context gain leverage through the central position of IdM digital infrastructures. Such attacks will compromize service operations, reduce the security of citizens and will expose personal data - those of military personell included. The article defines the issue, summarizes its background and then discusses the implications of cyberwar for vendors and applicants digital identity management infrastructures where IdM is positioned as a critical infrastructure in society.
title: On the diffusion of security behaviours
Creators: name: Kurowski, Sebastian
name: Roßnagel, Heiko
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2020
Subjects: subject: Security behaviour
subject: Policy Compliance
subject: Diffusion of Innovation
subject: Security Culture

description: Security behaviour has been researched from a variety of theoretical lenses, however a clear picture on the factors that foster secure behaviour is still missing. This contribution uses the diffusion of innovations theory and applies it to four exemplary security behaviours to identify how it can explain the uptake of each behaviour. In contrast to many other approaches, it focuses on the behaviour itself, not the behaving individual. We are able to show differences in the uptake of idealized security behaviours. A perceived relative advantage positively impacts the uptake of a behaviour, however this advantage seems rarely to be motivated by a perceived risk. Risk only seems to play a minor role for the diffusion of security behaviours. Additionally, the relative advantage does not seem to be a necessity for the diffusion of a behaviour. If the other properties namely compatibility, triability, observability, and low complexity of a behaviour are adequately fulfilled a successful diffusion is still possible.
title: Agent-based Models as a Method to Analyse Privacy-friendly Business Models in an Assistant Ecosystem
Creators: name: Kubach, Michael
name: Fähnrich, Nicolas
name: Mihale-Wilson, Cristina
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2020
Subjects: subject: agent-based modelling
subject: business models
subject: smart assistants
subject: ecosystem
subject: diffusion

description: Various projects and initiatives strive towards designing privacy friendly open platforms and ecosystems for digital products and services. However, besides mastering technical challenges, achieving economic viability and broad market success has so far proven to be difficult for these initiatives. Based on a publicly funded research project, this study focuses on the business model design for an open digital ecosystem for privacy friendly and trustworthy intelligent assistants. We present how the agent-based modelling technique can be employed to evaluate how business models perform in various constellations of an open digital ecosystem. Thus, our work relates to the strategic choice of suitable business models as an important success factor for privacy and security-relevant technologies.
title: A Human Digital Twin as Building Block of Open Identity Management for the Internet of Things
Creators: name: Zibuschka, Jan
name: Ruff, Christopher
name: Horch, Andrea
name: Roßnagel, Heiko
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2020
Subjects: subject: digital twin
subject: internet of things
subject: interoperability
subject: data protection
subject: identity management

description: In networked industry, digital twins aggregate product data along the entire life cycle, from design and production to deployment. This enables interoperability between different data sources and analysis functions and creates an integrated data environment. Human digital twins have the potential to create a similarly interoperable and integrated data environment for more user-centric use cases in the field of the Internet of Things. In this case, personal data is processed and transmitted; therefore, the underlying infrastructure is then not product data management but identity management. In this paper, we discuss general aspects of the human digital twin, its role in open identity management systems, and illustrate its application in the field of home, building and office automation. We identify advantages and limitations and suggest future research opportunities.
Few-femtosecond resolved imaging of laser-driven nanoplasma expansion
Creators: name: Peltz, C.
name: Powell, J. A.
name: Rupp, P.
name: Summers, A
name: Gorkhover, T.
name: Gallei, M.
name: Halfpap, I.
name: Antonsson, E.
name: Langer, B.
name: Trallero-Herrero, C.
name: Graf, C.
name: Ray, D.
name: Liu, Q.
name: Osipov, T.
name: Bucher, M.
name: Ferguson, K.
name: Möller, S.
name: Zherebtsov, S.
name: Rolles, D.
name: Rühl, E.
name: Coslovich, G.
name: Coffee, R. N.
name: Bostedt, C.
name: Rudenko, A.
name: Kling, M. F.
name: Fennel, T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The free expansion of a planar plasma surface is a fundamental non-equilibrium process relevant for various fields but as-yet experimentally still difficult to capture. The significance of the associated spatiotemporal plasma motion ranges from astrophysics and controlled fusion to laser machining, surface high-harmonic generation, plasma mirrors, and laser-particle acceleration. Here, we show that x-ray coherent diffractive imaging can surpass existing approaches and enables the quantitative real-time analysis of the sudden free expansion of nanoplasmas. For laser-ionized SiO$_2$ nanospheres, we resolve the formation of the emerging nearly self-similar plasma profile evolution and expose the so far inaccessible shell-wise expansion dynamics including the associated startup delay and rarefaction front velocity. Our results establish time-resolved diffractive imaging as an accurate quantitative diagnostic platform for tracing and characterizing plasma expansion and indicate the possibility to resolve various laser-driven processes including shock formation and wave-breaking phenomena with unprecedented resolution.
title: Token Based Authorization
Creators: name: Baruzzi, Giovanni A.
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2020
Subjects: subject: Access Control
subject: Token
subject: Fine-grained Access
subject: Authorization
subject: Claim.

description: A secure, scalable, fine grained and flexible access control is extremely important for the digital society. The approaches used until now (RBAC, Groups in an LDAP Directory, XACML) alone may not be able to deliver to this challenge. Building from past experiences in the Industry, we propose an Access Management Framework where the central role is played by a token containing all the information needed to implement fine grained access control. This Authorization Token should be signed by the approver and embedded into a “claim” to the application at session time. The application, after checking the validity of the token will control access to the desired resource. In this way we can achieve fine granular access control, scalability and independence from network topologies.
Weakly first-order quantum phase transition between Spin Nematic and Valence Bond Crystal Order in a square lattice SU(4) fermionic model
Creators: name: Patil, Pranay
name: Alet, Fabien
name: Capponi, Sylvain
name: Mambrini, Matthieu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider a model Hamiltonian with two SU(4) fermions per site on a square lattice, showing a competition between bilinear and biquadratic interactions. This model has generated interest due to possible realizations in ultracold atom experiments and existence of spin liquid ground states. Using a basis transformation, we show that part of the phase diagram is amenable to quantum Monte Carlo simulations without a sign problem. We find evidence for spin nematic and valence bond crystalline phases, which are separated by a weak first order phase transition. A U(1) symmetry is found to emerge in the valence bond crystal histograms, suggesting proximity to a deconfined quantum critical point. Our results are obtained with the help of a loop algorithm which allows large-scale simulations of bilinear-biquadratic SO(N ) models on arbitrary lattices in a certain parameter regime.
description: 6+7 pages, 8 figures
N=(0,4) Black String Chains
Creators: name: Couzens, Christopher
name: Lozano, Yolanda
name: Petri, Nicolò
name: Vandoren, Stefan
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct black string solutions in Type IIA supergravity arising from intersecting D2-D4-D6-NS5 branes in the presence of fractional D4-branes. The fractional D4-branes arise from D6-branes wrapping (collapsing) two-cycles in a Calabi--Yau two-fold. In the near horizon limit these solutions give rise to AdS$_3$ geometries preserving $\mathcal{N}=(0,4)$ supersymmetry and fall within the recent classification of \cite{Lozano:2019emq}. We interpret our solutions as describing chains of black strings stacked on top of each other along an interval. We construct 2d quiver CFTs dual to our solutions that reproduce the Bekenstein-Hawking entropy microscopically.
description: 33 pages, 3 figures
Effects of an Intermediate Mass Sterile Neutrino Population on the Early Universe
Creators: name: Rasmussen, Hannah
name: McNichol, Alex
name: Fuller, George M.
name: Kishimoto, Chad T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The hot and dense early Universe combined with the promise of high-precision cosmological observations provide an intriguing laboratory for Beyond Standard Model (BSM) physics. We simulate the early Universe to examine the effects of the decay of thermally populated sterile neutrino states into Standard Model products around the time of weak decoupling. These decays deposit a significant amount of entropy into the plasma as well as produce a population of high-energy out-of-equilibrium active neutrinos. As a result, we can constrain these models by their inferred value of $N_{\rm eff}$, the effective number of relativistic degrees of freedom. In this work, we explore a variety of models with $N_{\rm eff}{}$ values consistent with CMB observations, but with vastly different active neutrino spectra which will challenge the standard cosmological model, affect lepton capture rates on free nucleons, and may significantly affect Big Bang Nucleosynthesis (BBN).
description: 13 pages, 11 figures