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Jun 30, 2018
06/18

by
I. K. Yanson; L. F. Rybal'chenko; V. V. Fisun; N. L. Bobrov; V. M. Kirzhner; Yu. D. Tret'yakov; A. R. Kaul'; I. E. Graboi

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Point-contacts formed by the high-temperature superconductor $\rm YBa_2Cu_3O_{7-\delta}$ prepared by cryochemical technique, and a noble metal Ag or Cu) are investigated. The maximum value of the energy gap $\Delta\simeq 40~meV$ and the ratio $2\Delta/kT_c\simeq 12$ are obtained. It is found that along certain crystallographic axes of the superconductor under investigation, the electrical resistivity $\lesssim 10^{-5} \Omega\cdot cm$.

Topics: Condensed Matter, Superconductivity

Source: http://arxiv.org/abs/1701.08293

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0.0

Jun 30, 2018
06/18

by
Uri Ben-Ya'acov

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Relativistic Coulomb systems are studied in velocity space, prompted by the fact that the study of Newtonian Kepler/Coulomb systems in velocity space provides a method much simpler (and more elegant) than the familiar analytic solutions in ordinary space. The key for the simplicity and elegance of the velocity-space method is the linearity of the velocity equation, which is a unique feature of $1/r$ interactions for Newtonian and relativistic systems alike, allowing relatively simple analytic...

Topics: Physics, Classical Physics

Source: http://arxiv.org/abs/1701.08281

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0.0

Jun 30, 2018
06/18

by
N. Behzadi; E. Faizi; O. Heibati

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In this paper, by exploiting the weak measurement and quantum measurement re- versal (WMQMR) procedure, we propose a scheme to show how one can protect the geometric quantum discord (GQD) of a two-qutrit V-type atomic system each of which interacts with a dissipative reservoir independently. We examine the scheme for the GQD of the initial two-qutrit Werner and Horodecki states for different classes of weak mea- surement strengthes. It is found out that the presented protocol enables us to...

Topic: Quantum Physics

Source: http://arxiv.org/abs/1701.08278

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1.0

Jun 30, 2018
06/18

by
Andrew C. Heusser; Kirsten Ziman; Lucy L. W. Owen; Jeremy R. Manning

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Data visualizations can reveal trends and patterns that are not otherwise obvious from the raw data or summary statistics. While visualizing low-dimensional data is relatively straightforward (for example, plotting the change in a variable over time as (x,y) coordinates on a graph), it is not always obvious how to visualize high-dimensional datasets in a similarly intuitive way. Here we present HypeTools, a Python toolbox for visualizing and manipulating large, high-dimensional datasets. Our...

Topics: Other Statistics, Statistics

Source: http://arxiv.org/abs/1701.08290

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Jun 30, 2018
06/18

by
Christos Perentis; Michele Vescovi; Chiara Leonardi; Corrado Moiso; Mirco Musolesi; Fabio Pianesi; Bruno Lepri

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The wide adoption of mobile devices and social media platforms have dramatically increased the collection and sharing of personal information. More and more frequently, users are called to take decisions concerning the disclosure of their personal information. In this study, we investigate the factors affecting users' choices toward the disclosure of their personal data, including not only their demographic and self-reported individual characteristics, but also their social interactions and...

Topics: Human-Computer Interaction, Cryptography and Security, Computers and Society, Computing Research...

Source: http://arxiv.org/abs/1701.08308

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0.0

Jun 30, 2018
06/18

by
Collin Bleak; Matthew G. Brin; Martin Kassabov; Justin Tatch Moore; Matthew C. B. Zaremsky

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We adapt the Ping-Pong Lemma, which historically was used to study free products of groups, to the setting of the homeomorphism group of the unit interval. As a consequence, we isolate a large class of generating sets for subgroups of $\mathrm{Homeo}_+(I)$ for which certain finite dynamical data can be used to determine the marked isomorphism type of the groups which they generate. As a corollary, we will obtain a criteria for embedding subgroups of $\mathrm{Homeo}_+(I)$ into Richard Thompson's...

Topics: Group Theory, Mathematics

Source: http://arxiv.org/abs/1701.08321

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0.0

Jun 30, 2018
06/18

by
David M. Harrington; Stacey R. Sueoka

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We outline polarization performance calculations and predictions for the Daniel K. Inouye Solar Telescope (DKIST) optics and show Mueller matrices for two of the first light instruments. Telescope polarization is due to polarization dependent mirror reflectivity and rotations between groups of mirrors as the telescope moves in altitude and azimuth. The Zemax optical modeling software has polarization ray-trace capabilities and predicts system performance given a coating prescription. We develop...

Topics: Instrumentation and Methods for Astrophysics, Astrophysics

Source: http://arxiv.org/abs/1701.08327

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0.0

Jun 30, 2018
06/18

by
Carlo Marinelli; Luca Scarpa

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We prove existence and uniqueness of strong solutions for a class of second-order stochastic PDEs with multiplicative Wiener noise and drift of the form $\operatorname{div} \gamma(\nabla \cdot)$, where $\gamma$ is a maximal monotone graph in $\mathbb{R}^n \times \mathbb{R}^n$ obtained as the subdifferential of a convex function satisfying very mild assumptions on its behavior at infinity. The well-posedness result complements the corresponding one in our recent work arXiv:1612.08260 where,...

Topics: Probability, Analysis of PDEs, Mathematics

Source: http://arxiv.org/abs/1701.08326

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1.0

Jun 30, 2018
06/18

by
Kenneth K H Fung; Geraint F Lewis; Xiaofeng Wu

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A vast wealth of literature exists on the topic of rocket trajectory optimisation, particularly in the area of interplanetary trajectories due to its relevance today. Studies on optimising interstellar and intergalactic trajectories are usually performed in flat spacetime using an analytical approach, with very little focus on optimising interstellar trajectories in a general relativistic framework. This paper examines the use of low-acceleration rockets to reach galactic destinations in the...

Topics: Instrumentation and Methods for Astrophysics, Physics, Astrophysics of Galaxies, Space Physics,...

Source: http://arxiv.org/abs/1702.00030

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3.0

Jun 30, 2018
06/18

by
Nattiya Kanhabua; Philipp Kemkes; Wolfgang Nejdl; Tu Ngoc Nguyen; Felipe Reis; Nam Khanh Tran

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Significant parts of cultural heritage are produced on the web during the last decades. While easy accessibility to the current web is a good baseline, optimal access to the past web faces several challenges. This includes dealing with large-scale web archive collections and lacking of usage logs that contain implicit human feedback most relevant for today's web search. In this paper, we propose an entity-oriented search system to support retrieval and analytics on the Internet Archive. We use...

Topics: Information Retrieval, Computing Research Repository, Digital Libraries

Source: http://arxiv.org/abs/1701.08256

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0.0

Jun 30, 2018
06/18

by
A. I. Bandura; O. B. Skaskiv

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In this paper, there are obtained growth estimates of entire in $\mathbb{C}^n$ function of bounded $\mathbf{L}$-index in joint variables. They describe the behaviour of maximum modulus of entire function on a skeleton in a polydisc by behaviour of the function $\mathbf{L}(z)=(l_1(z),\ldots,l_n(z)),$ where for every $j\in\{1,\ldots, n\}$ \ $l_j:\mathbb{C}^n\to \mathbb{R}_+$ is a continuous function. We generalised known results of W. K. Hayman, M. M. Sheremeta, A. D. Kuzyk, M. T. Borduyak, T. O....

Topics: Complex Variables, Mathematics

Source: http://arxiv.org/abs/1701.08276

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1.0

Jun 30, 2018
06/18

by
Christian Reinhardt; Joachim Stadel

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In this paper we present solutions to three short comings of Smoothed Particles Hydrodynamics (SPH) encountered in previous work when applying it to Giant Impacts. First we introduce a novel method to obtain accurate SPH representations of a planet's equilibrium initial conditions based on equal area tessellations of the sphere. This allows one to imprint an arbitrary density and internal energy profile with very low noise which substantially reduces computation because these models require no...

Topics: Fluid Dynamics, Physics, Computational Physics, Astrophysics, Earth and Planetary Astrophysics

Source: http://arxiv.org/abs/1701.08296

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1.0

Jun 30, 2018
06/18

by
Mohamad Jaafar Ali; Hassine Moungla; Ahmed Mehaoua

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Recent advances in microelectronics have enabled the realization of Wireless Body Area Networks (WBANs). Increasing the transmission power of WBAN's nodes improves the Signal to Interference plus Noise Ratio (SINR), and hence decreases the bit error probability. However, this increase may impose interference on nodes within the same WBAN or on other nodes of nearby coexisting WBANs, as these WBANs may use similar frequencies. Due to co-channel interference, packet collisions and retransmissions...

Topics: Networking and Internet Architecture, Computing Research Repository

Source: http://arxiv.org/abs/1701.08295

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0.0

Jun 30, 2018
06/18

by
Anton Kapustin; Ryan Thorngren

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We discuss bosonization and Fermionic Short-Range-Entangled (FSRE) phases of matter in one, two, and three spatial dimensions, emphasizing the physical meaning of the cohomological parameters which label such phases and the connection with higher-form symmetries. We propose a classification scheme for fermionic SPT phases in three spatial dimensions with an arbitrary finite point symmetry G. It generalizes the supercohomology of Gu and Wen. We argue that the most general such phase can be...

Topics: Strongly Correlated Electrons, High Energy Physics - Theory, Condensed Matter

Source: http://arxiv.org/abs/1701.08264

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0.0

Jun 30, 2018
06/18

by
The BABAR Collaboration

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We study the processes $e^+ e^-\to K^0_S K^0_L\pi^0\gamma$, $K^0_S K^0_L\eta\gamma$, and $K^0_S K^0_L\pi^0\pi^0\gamma$, where the photon is radiated from the initial state, providing cross section measurements for the hadronic final states over a continuum of center-of-mass energies. The results are based on 469~$fb^{-1}$ of data collected at or near the $\Upsilon(4S)$~ resonance with the BaBar detector at SLAC. We present the first measurements of the $e^+ e^-\to K^0_S K^0_L\pi^0$, $K^0_S...

Topic: High Energy Physics - Experiment

Source: http://arxiv.org/abs/1701.08297

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3.0

Jun 30, 2018
06/18

by
Yoju Fujino; Tadashi Wadayama

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In this paper, we propose a construction of non-binary WOM (Write-Once-Memory) codes for WOM storages such as flash memories. The WOM codes discussed in this paper are fixed rate WOM codes where messages in a fixed alphabet of size $M$ can be sequentially written in the WOM storage at least $t^*$-times. In this paper, a WOM storage is modeled by a state transition graph. The proposed construction has the following two features. First, it includes a systematic method to determine the encoding...

Topics: Information Theory, Computing Research Repository, Mathematics

Source: http://arxiv.org/abs/1701.08347

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1.0

Jun 30, 2018
06/18

by
Andreas Nink

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In this thesis we investigate various fundamental aspects of asymptotically safe quantum gravity, in particular the compatibility of Asymptotic Safety with the requirements for background independence and unitarity. The first part contains a detailed analysis of the space of metrics. We unveil a novel, specifically designed connection on this space and use the corresponding geodesics to connect all metrics having the same signature. In the second part we study the consequences of different...

Topics: High Energy Physics - Theory, General Relativity and Quantum Cosmology, Mathematical Physics,...

Source: http://arxiv.org/abs/1701.08344

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1.0

Jun 30, 2018
06/18

by
Carlos Bocker-Neto; Ricardo Bortolotti

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Consider a dynamical system $T:\mathbb{T}\times \mathbb{R}^{d} \rightarrow \mathbb{T}\times \mathbb{R}^{d} $ given by $ T(x,y) = (E(x), C(y) + f(x))$, where $E$ is a linear expanding map of $\mathbb{T}$, $C$ is a linear contracting map of $\mathbb{R}^d$ and $f$ is in $C^2(\mathbb{T},\mathbb{R}^d)$. We prove that if $T$ is volume expanding and $u\geq d$, then for every $E$ there exists an open set $\mathcal{U}$ of pairs $(C,f)$ for which the corresponding dynamic $T$ admits an absolutely...

Topics: Dynamical Systems, Mathematics

Source: http://arxiv.org/abs/1701.08342

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0.0

Jun 30, 2018
06/18

by
Christoph Becker; Dawn Walker; Curtis McCord

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When making choices in software projects, engineers and other stakeholders engage in decision making that involves uncertain future outcomes. Research in psychology, behavioral economics and neuroscience has questioned many of the classical assumptions of how such decisions are made. This literature review aims to characterize the assumptions that underpin the study of these decisions in Software Engineering. We identify empirical research on this subject and analyze how the role of time has...

Topics: Software Engineering, Computing Research Repository

Source: http://arxiv.org/abs/1701.08310

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1.0

Jun 30, 2018
06/18

by
Ronald L. Rivest

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We propose a simple risk-limiting audit for elections, ClipAudit. To determine whether candidate A (the reported winner) actually beat candidate B in a plurality election, ClipAudit draws ballots at random, without replacement, until either all cast ballots have been drawn, or until \[ a - b \ge \beta \sqrt{a+b} \] where $a$ is the number of ballots in the sample for the reported winner A, and $b$ is the number of ballots in the sample for opponent B, and where $\beta$ is a constant determined...

Topics: Cryptography and Security, Statistics, Applications, Computing Research Repository

Source: http://arxiv.org/abs/1701.08312

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0.0

Jun 30, 2018
06/18

by
Imre Leader; Luka Milićević; Ta Sheng Tan

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Let $f_r(n)$ be the minimum number of complete $r$-partite $r$-graphs needed to partition the edge set of the complete $r$-uniform hypergraph on $n$ vertices. Graham and Pollak showed that $f_2(n) = n-1$. An easy construction shows that $f_r(n)\le (1-o(1))\binom{n}{\lfloor r/2\rfloor}$ and it has been unknown if this upper bound is asymptotically sharp. In this paper we show that $f_r(n)\le (\frac{14}{15}+o(1))\binom{n}{r/2}$ for each even $r\ge 4$.

Topics: Combinatorics, Mathematics

Source: http://arxiv.org/abs/1701.08335

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1.0

Jun 30, 2018
06/18

by
Viktor Witkovsky; Gejza Wimmer; Tomas Duby

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A non-parametric method for evaluation of the aggregate loss distribution (ALD) by combining and numerically inverting the empirical characteristic functions (CFs) is presented and illustrated. This approach to evaluate ALD is based on purely non-parametric considerations, i.e., based on the empirical CFs of frequency and severity of the claims in the actuarial risk applications. This approach can be, however, naturally generalized to a more complex semi-parametric modeling approach, e.g., by...

Topics: Computation, Statistics, Risk Management, Applications, Quantitative Finance

Source: http://arxiv.org/abs/1701.08299

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0.0

Jun 30, 2018
06/18

by
Peilong Hong

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Random scattering is usually viewed as a serious nuisance in optical imaging, and needs to be prevented in the conventional imaging scheme based on single-photon interference. Here we proposed a two-photon imaging scheme with the widely used lens replaced by a dynamic random medium. In contrast to destroying imaging process, the dynamic random medium in our scheme works as a crucial imaging element to bring constructive interference, and allows us to image an object from light field scattered...

Topics: Optics, Physics

Source: http://arxiv.org/abs/1701.08348

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1.0

Jun 30, 2018
06/18

by
Joseph Doolittle

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We present a partial description of which polytopes are reconstructible from their graphs. This is an extension of work by Blind and Mani (1987) and Kalai (1988), which showed that simple polytopes can be reconstructed from their graphs. In particular, we introduce a notion of $h$-nearly simple and prove that 1-nearly simple and 2-nearly simple polytopes are reconstructible from their graphs. We also give an example of a 3-nearly simple polytope which is not reconstructible from its graph....

Topics: Combinatorics, Mathematics

Source: http://arxiv.org/abs/1701.08334

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4.0

Jun 30, 2018
06/18

by
Ebrahim Ansari; M. H. Sadreddini; Mostafa Sheikhalishahi; Richard Wallace; Fatemeh Alimardani

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The effectiveness of a statistical machine translation system (SMT) is very dependent upon the amount of parallel corpus used in the training phase. For low-resource language pairs there are not enough parallel corpora to build an accurate SMT. In this paper, a novel approach is presented to extract bilingual Persian-Italian parallel sentences from a non-parallel (comparable) corpus. In this study, English is used as the pivot language to compute the matching scores between source and target...

Topics: Computing Research Repository, Computation and Language

Source: http://arxiv.org/abs/1701.08339

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0.0

Jun 30, 2018
06/18

by
Maryam Khezerlou; Hadi Goudarzi; Samin Asgarifar

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Among the potential applications of topological insulators, we theoretically study the coexistence of proximity-induced ferromagnetic and superconducting orders in the surface states of a 3-dimensional topological insulator. The superconducting electron-hole excitations can be significantly affected by the magnetic order induced by a ferromagnet. In one hand, the surface state of the topological insulator, protected by the time-reversal symmetry, creates a spin-triplet and, on the other hand,...

Topics: Mesoscale and Nanoscale Physics, Condensed Matter

Source: http://arxiv.org/abs/1701.08277

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0.0

Jun 30, 2018
06/18

by
Nathan Johns

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In 1933, Rado conjectured that for any positive integer n, there is always a linear homogeneous equation with degree of regularity n. In proving this conjecture, Alexeev and Tsimerman, and independently Golowich, found that some equations in n variables have degree of regularity n-1 for any value of n. Their work left many questions as to how and which other properties of equations are closely tied to the degree of regularity, and if there is a simpler or more effective way of thinking about...

Topics: Combinatorics, Mathematics

Source: http://arxiv.org/abs/1701.08252

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0.0

Jun 30, 2018
06/18

by
Sanjay Ghosh; Amit K. Mandal; Kunal N. Chaudhury

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In Non-Local Means (NLM), each pixel is denoised by performing a weighted averaging of its neighboring pixels, where the weights are computed using image patches. We demonstrate that the denoising performance of NLM can be improved by pruning the neighboring pixels, namely, by rejecting neighboring pixels whose weights are below a certain threshold $\lambda$. While pruning can potentially reduce pixel averaging in uniform-intensity regions, we demonstrate that there is generally an overall...

Topics: Computing Research Repository, Computer Vision and Pattern Recognition

Source: http://arxiv.org/abs/1701.08280

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0.0

Jun 30, 2018
06/18

by
Liumeng Wang; Sheng Zhou

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Breaking the fronthaul capacity limitations is vital to make cloud radio access network (C-RAN) scalable and practical. One promising way is aggregating several remote radio units (RRUs) as a cluster to share a fronthaul link, so as to enjoy the statistical multiplexing gain brought by the spatial randomness of the traffic. In this letter, a tractable model is proposed to analyze the fronthaul statistical multiplexing gain. We first derive the user blocking probability caused by the limited...

Topics: Information Theory, Computing Research Repository, Mathematics

Source: http://arxiv.org/abs/1701.08266

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0.0

Jun 30, 2018
06/18

by
Zoltán Füredi; Ida Kantor

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Every graph $G=(V,E)$ is an induced subgraph of some Kneser graph of rank $k$, i.e., there is an assignment of (distinct) $k$-sets $v \mapsto A_v$ to the vertices $v\in V$ such that $A_u$ and $A_v$ are disjoint if and only if $uv\in E$. The smallest such $k$ is called the Kneser rank of $G$ and denoted by $f_{\rm Kneser}(G)$. As an application of a result of Frieze and Reed concerning the clique cover number of random graphs we show that for constant $0 < p < 1$ there exist constants...

Topics: Combinatorics, Mathematics

Source: http://arxiv.org/abs/1701.08292

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0.0

Jun 30, 2018
06/18

by
Valentina Castiglioni; Daniel Gebler; Simone Tini

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We propose a method for the decomposition of modal formulae on processes with nondeterminism and probability with respect to Structural Operational Semantics. The purpose is to reduce the satisfaction problem of a formula for a process to verifying whether its subprocesses satisfy certain formulae obtained from the decomposition. To deal with the probabilistic behavior of processes, and thus with the decomposition of formulae characterizing it, we introduce a SOS-like machinery allowing for the...

Topics: Logic in Computer Science, Computing Research Repository

Source: http://arxiv.org/abs/1701.08330

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0.0

Jun 30, 2018
06/18

by
Azadeh Farzan; Victor Nicolet

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This paper focuses on automated synthesis of divide-and-conquer parallelism, which is a common parallel programming skeleton supported by many cross-platform multithreaded libraries. The challenges of producing (manually or automatically) a correct divide-and-conquer parallel program from a given sequential code are two-fold: (1) assuming that individual worker threads execute a code identical to the sequential code, the programmer has to provide the extra code for dividing the tasks and...

Topics: Logic in Computer Science, Programming Languages, Computing Research Repository

Source: http://arxiv.org/abs/1701.08345

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0.0

Jun 30, 2018
06/18

by
Mani A; Rebeka Mukherjee

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FOSS is an acronym for Free and Open Source Software. The FOSS 2013 survey primarily targets FOSS contributors and relevant anonymized dataset is publicly available under CC by SA license. In this study, the dataset is analyzed from a critical perspective using statistical and clustering techniques (especially multiple correspondence analysis) with a strong focus on women contributors towards discovering hidden trends and facts. Important inferences are drawn about development practices and...

Topics: Software Engineering, Computers and Society, Computing Research Repository, Machine Learning,...

Source: http://arxiv.org/abs/1701.08302

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0.0

Jun 30, 2018
06/18

by
Alexander Shramchenko; Vasilisa Shramchenko

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We propose a procedure of constructing new block designs starting from a given one by looking at the intersections of its blocks with various sets and grouping those sets according to the structure of the intersections. We introduce a symmetric relationship of friendship between block designs built on a set $V$ and consider families of block designs where all designs are friends of each other, the so-called friendly families. We show that a friendly family admits a partial ordering....

Topics: Combinatorics, Mathematics

Source: http://arxiv.org/abs/1701.08325

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0.0

Jun 30, 2018
06/18

by
Upal Mahbub; Sayantan Sarkar; Rama Chellappa

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Generic face detection algorithms do not perform very well in the mobile domain due to significant presence of occluded and partially visible faces. One promising technique to handle the challenge of partial faces is to design face detectors based on facial segments. In this paper two such face detectors namely, SegFace and DeepSegFace, are proposed that detect the presence of a face given arbitrary combinations of certain face segments. Both methods use proposals from facial segments as input...

Topics: Computing Research Repository, Computer Vision and Pattern Recognition

Source: http://arxiv.org/abs/1701.08341

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0.0

Jun 30, 2018
06/18

by
Paweł Przybyłowicz

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The paper deals with strong global approximation of SDEs driven by two independent processes: a nonhomogeneous Poisson process and a Wiener process. We assume that the jump and diffusion coefficients of the underlying SDE satisfy jump commutativity condition. We establish the exact convergence rate of minimal errors that can be achieved by arbitrary algorithms based on a finite number of observations of the Poisson and Wiener processes. We consider classes of methods that use equidistant or...

Topics: Numerical Analysis, Mathematics

Source: http://arxiv.org/abs/1701.08311

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Jun 30, 2018
06/18

by
Ivan Kasanický; Jan Mandel

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Bayesian inverse problem on an infinite dimensional separable Hilbert space with the whole state observed is well posed when the prior state distribution is a Gaussian probability measure and the data error covariance is a cylindric Gaussian measure whose covariance has positive lower bound. If the state distribution and the data distribution are equivalent Gaussian probability measures, then the Bayesian posterior measure is not well defined. If the state covariance and the data error...

Topics: Probability, Mathematics

Source: http://arxiv.org/abs/1701.08298

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0.0

Jun 30, 2018
06/18

by
Daniel Zahavi; Ron Dabora

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Handling interference is one of the main challenges in the design of wireless networks. In this paper we study the application of cooperation for interference management in the weak interference (WI) regime, focusing on the Z-interference channel with a causal relay (Z-ICR), when the channel coefficients are subject to ergodic phase fading, all transmission powers are finite, and the relay is full-duplex. In order to provide a comprehensive understanding of the benefits of cooperation in the WI...

Topics: Information Theory, Computing Research Repository, Mathematics

Source: http://arxiv.org/abs/1701.08337

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Jun 30, 2018
06/18

by
Azam Asanjarani; Yoni Nazarathy; Philip K. Pollett

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This is an annotated bibliography on estimation and inference results for queues and related stochastic models. The purpose of this document is to collect and categorise works in the field, allowing for researchers and practitioners to explore the various types of results that exist. This bibliography attempts to include all known works that satisfy both of these requirements: -Works that deal with queueing models. -Works that contain contributions related to the methodology of parameter...

Topics: Statistics Theory, Statistics, Computing Research Repository, Performance, Mathematics

Source: http://arxiv.org/abs/1701.08338

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Jun 30, 2018
06/18

by
Farnaz Basiri; Jose Casadiego; Marc Timme; Dirk Witthaut

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We develop methods to efficiently reconstruct the topology and line parameters of a power grid from the measurement of nodal variables. We propose two compressed sensing algorithms that minimize the amount of necessary measurement resources by exploiting network sparsity, symmetry of connections and potential prior knowledge about the connectivity. The algorithms are reciprocal to established state estimation methods, where nodal variables are estimated from few measurements given the network...

Topics: Optimization and Control, Systems and Control, Computing Research Repository, Mathematics

Source: http://arxiv.org/abs/1701.09084

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Jun 30, 2018
06/18

by
Jia Xu; Yong Yao

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This paper proposes a totally constructive approach for the proof of Hilbert's theorem on ternary quartic forms. The main contribution is the ladder technique, with which the Hilbert's theorem is proved vividly.

Topics: Algebraic Geometry, Symbolic Computation, Computing Research Repository, Mathematics

Source: http://arxiv.org/abs/1701.08294

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Jun 30, 2018
06/18

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Zohreh Shams; Marina De Vos; Julian Padget; Wamberto W. Vasconcelos

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Autonomous software agents operating in dynamic environments need to constantly reason about actions in pursuit of their goals, while taking into consideration norms which might be imposed on those actions. Normative practical reasoning supports agents making decisions about what is best for them to (not) do in a given situation. What makes practical reasoning challenging is the interplay between goals that agents are pursuing and the norms that the agents are trying to uphold. We offer a...

Topics: Artificial Intelligence, Computing Research Repository

Source: http://arxiv.org/abs/1701.08306

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Jun 30, 2018
06/18

by
Pan Li; Arya Mazumdar; Olgica Milenkovic

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We propose a novel rank aggregation method based on converting permutations into their corresponding Lehmer codes or other subdiagonal images. Lehmer codes, also known as inversion vectors, are vector representations of permutations in which each coordinate can take values not restricted by the values of other coordinates. This transformation allows for decoupling of the coordinates and for performing aggregation via simple scalar median or mode computations. We present simulation results...

Topics: Learning, Artificial Intelligence, Computing Research Repository

Source: http://arxiv.org/abs/1701.09083

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Jun 30, 2018
06/18

by
Clifford A. Bearden

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In previous work, we defined and studied $\Sigma^*$-modules, a class of Hilbert $C^*$-modules over $\Sigma^*$-algebras (the latter are $C^*$-algebras that are sequentially closed in the weak operator topology). The present work continues this study by developing the appropriate $\Sigma^*$-algebraic analogue of the notion of strong Morita equivalence for $C^*$-algebras. We define strong $\Sigma^*$-Morita equivalence, prove a few characterizations, look at the relationship with equivalence of...

Topics: Operator Algebras, Mathematics

Source: http://arxiv.org/abs/1701.08333

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Jun 30, 2018
06/18

by
İlke Çuğu; Eren Şener; Çağrı Erciyes; Burak Balcı; Emre Akın; Itır Önal; Ahmet Oğuz Akyüz

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We propose a novel tree classification system called Treelogy, that fuses deep representations with hand-crafted features obtained from leaf images to perform leaf-based plant classification. Key to this system are segmentation of the leaf from an untextured background, using convolutional neural networks (CNNs) for learning deep representations, extracting hand-crafted features with a number of image processing techniques, training a linear SVM with feature vectors, merging SVM and CNN...

Topics: Computing Research Repository, Computer Vision and Pattern Recognition

Source: http://arxiv.org/abs/1701.08291

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Jun 30, 2018
06/18

by
Sima Bahrani; Mohsen Razavi; Jawad A. Salehi

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In this paper, we consider the problem of wavelength assignment in dense-wavelength-division-multiplexing (DWDM) systems that integrate both quantum and classical channels. This requires the transmission of weak quantum key distribution (QKD) signals alongside intense classical signals on the same fiber, where the former can be masked by the background noise induced by the latter. Here, we investigate how optimal wavelength assignment can mitigate this problem. We consider different DWDM...

Topic: Quantum Physics

Source: http://arxiv.org/abs/1701.08270

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Jun 30, 2018
06/18

by
Xudong Sun; Pengcheng Wu; Steven C. H. Hoi

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In this report, we present a new face detection scheme using deep learning and achieve the state-of-the-art detection performance on the well-known FDDB face detetion benchmark evaluation. In particular, we improve the state-of-the-art faster RCNN framework by combining a number of strategies, including feature concatenation, hard negative mining, multi-scale training, model pretraining, and proper calibration of key parameters. As a consequence, the proposed scheme obtained the...

Topics: Computing Research Repository, Computer Vision and Pattern Recognition

Source: http://arxiv.org/abs/1701.08289

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Jun 30, 2018
06/18

by
Mareile Große Ruse; Adeline Samson; Susanne Ditlevsen

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Modeling of longitudinal data often requires diffusion models that incorporate overall time-dependent, nonlinear dynamics of multiple components and provide sufficient flexibility for subject-specific modeling. This complexity challenges parameter inference and approximations are inevitable. We propose a method for approximate maximum-likelihood parameter estimation in multivariate time-inhomogeneous diffusions, where subject-specific flexibility is accounted for by incorporation of...

Topics: Statistics Theory, Statistics, Methodology, Mathematics

Source: http://arxiv.org/abs/1701.08284

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Jun 30, 2018
06/18

by
M. A. Cordiner; N. Biver; J. Crovisier; D. Bockelee-Morvan; M. J. Mumma; S. B. Charnley; G. Villanueva; L. Paganini; D. C. Lis; S. N. Milam; A. J. Remijan; I. M. Coulson; Y. -J. Kuan; J. Boissier

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We present spatially and spectrally-resolved observations of CH$_3$OH emission from comet C/2012 K1 (PanSTARRS) using The Atacama Large Millimeter/submillimeter Array (ALMA) on 2014 June 28-29. Two-dimensional maps of the line-of-sight average rotational temperature ($T_{rot}$) were derived, covering spatial scales $0.3''-1.8''$ (corresponding to sky-projected distances $\rho\sim500$-2500 km). The CH$_3$OH column density distributions are consistent with isotropic, uniform outflow from the...

Topics: Astrophysics, Earth and Planetary Astrophysics

Source: http://arxiv.org/abs/1701.08258

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Jun 30, 2018
06/18

by
C. Colodro-Conde; S. Velasco; J. J. F. Valdivia; R. L. López; A. Oscoz; R. Rebolo; B. Femenía; D. L. King; L. Labadie; C. Mackay; B. Muthusubramanian; A. Pérez Garrido; M. Puga; G. Rodríguez-Coira; L. F. Rodríguez-Ramos; J. M. Rodríguez-Ramos; R. Toledo-Moreo; I. Villó-Pérez

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AOLI (Adaptive Optics Lucky Imager) is a state-of-art instrument that combines adaptive optics (AO) and lucky imaging (LI) with the objective of obtaining diffraction limited images in visible wavelength at mid- and big-size ground-based telescopes. The key innovation of AOLI is the development and use of the new TP3-WFS (Two Pupil Plane Positions Wavefront Sensor). The TP3-WFS, working in visible band, represents an advance over classical wavefront sensors such as the Shack-Hartmann WFS...

Topics: Instrumentation and Methods for Astrophysics, Astrophysics

Source: http://arxiv.org/abs/1701.08307