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1402.5365
Marco Bernardo
Marco Bernardo (University of Urbino), Rocco De Nicola (IMT Lucca), Michele Loreti (University of Firenze)
Revisiting Trace and Testing Equivalences for Nondeterministic and Probabilistic Processes
null
Logical Methods in Computer Science, Volume 10, Issue 1 (March 3, 2014) lmcs:1137
10.2168/LMCS-10(1:16)2014
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Two of the most studied extensions of trace and testing equivalences to nondeterministic and probabilistic processes induce distinctions that have been questioned and lack properties that are desirable. Probabilistic trace-distribution equivalence differentiates systems that can perform the same set of traces with the same probabilities, and is not a congruence for parallel composition. Probabilistic testing equivalence, which relies only on extremal success probabilities, is backward compatible with testing equivalences for restricted classes of processes, such as fully nondeterministic processes or generative/reactive probabilistic processes, only if specific sets of tests are admitted. In this paper, new versions of probabilistic trace and testing equivalences are presented for the general class of nondeterministic and probabilistic processes. The new trace equivalence is coarser because it compares execution probabilities of single traces instead of entire trace distributions, and turns out to be compositional. The new testing equivalence requires matching all resolutions of nondeterminism on the basis of their success probabilities, rather than comparing only extremal success probabilities, and considers success probabilities in a trace-by-trace fashion, rather than cumulatively on entire resolutions. It is fully backward compatible with testing equivalences for restricted classes of processes; as a consequence, the trace-by-trace approach uniformly captures the standard probabilistic testing equivalences for generative and reactive probabilistic processes. The paper discusses in full details the new equivalences and provides a simple spectrum that relates them with existing ones in the setting of nondeterministic and probabilistic processes.
[ { "created": "Fri, 21 Feb 2014 17:31:36 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 20:36:22 GMT", "version": "v2" }, { "created": "Tue, 4 Mar 2014 09:12:37 GMT", "version": "v3" } ]
2015-07-01
[ [ "Bernardo", "Marco", "", "University of Urbino" ], [ "De Nicola", "Rocco", "", "IMT Lucca" ], [ "Loreti", "Michele", "", "University of Firenze" ] ]
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1402.5368
Lucas Lacasa
Lucas Lacasa
On the degree distribution of horizontal visibility graphs associated to Markov processes and dynamical systems: diagrammatic and variational approaches
null
null
10.1088/0951-7715/27/9/2063
null
nlin.CD physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Dynamical processes can be transformed into graphs through a family of mappings called visibility algorithms, enabling the possibility of (i) making empirical data analysis and signal processing and (ii) characterising classes of dynamical systems and stochastic processes using the tools of graph theory. Recent works show that the degree distribution of these graphs encapsulates much information on the signals variability, and therefore constitutes a fundamental feature for statistical learning purposes. However, exact solutions for the degree distributions are only known in a few cases, such as for uncorrelated random processes. Here we analytically explore these distributions in a list of situations. We present a diagrammatic formalism which computes for all degrees their corresponding probability as a series expansion in a coupling constant which is the number of hidden variables. We offer a constructive solution for general Markovian stochastic processes and deterministic maps. As case tests we focus on Ornstein-Uhlenbeck processes, fully chaotic and quasiperiodic maps. Whereas only for certain degree probabilities can all diagrams be summed exactly, in the general case we show that the perturbation theory converges. In a second part, we make use of a variational technique to predict the complete degree distribution for special classes of Markovian dynamics with fast-decaying correlations. In every case we compare the theory with numerical experiments.
[ { "created": "Fri, 21 Feb 2014 17:47:53 GMT", "version": "v1" } ]
2015-06-18
[ [ "Lacasa", "Lucas", "" ] ]
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1402.5370
Aakash Ajit Sahai
Aakash A. Sahai, F. S. Tsung, A. R. Tableman, W. B. Mori, T. C. Katsouleas
Relativistically Induced Transparency Acceleration (RITA) of Protons and Light-ions with Ultrashort Laser Interaction with Heavy-ion Plasma Density Gradient
null
Physical Review E 88, 043105 Published 28 October 2013
10.1103/PhysRevE.88.043105
null
physics.plasm-ph physics.acc-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The relativistically induced transparency acceleration (RITA) scheme of proton and ion acceleration using laser-plasma interactions is introduced, modeled, and compared to the existing schemes. Protons are accelerated with femtosecond relativistic pulses to produce quasimonoenergetic bunches with controllable peak energy. The RITA scheme works by a relativistic laser inducing transparency to densities higher than the cold-electron critical density, while the background heavy ions are stationary. The rising laser pulse creates a traveling acceleration structure at the relativistic critical density by ponderomotively driving a local electron density inflation, creating an electron snowplow and a co-propagating electrostatic potential. The snowplow advances with a velocity determined by the rate of the rise of the laser's intensity envelope and the heavy-ion-plasma density gradient scale length. The rising laser is incrementally rendered transparent to higher densities such that the relativistic-electron plasma frequency is resonant with the laser frequency. In the snowplow frame, trace density protons reflect off the electrostatic potential and get snowplowed, while the heavier background ions are relatively unperturbed. Quasimonoenergetic bunches of velocity equal to twice the snowplow velocity can be obtained and tuned by controlling the snowplow velocity using laser-plasma parameters. An analytical model for the proton energy as a function of laser intensity, rise time, and plasma density gradient is developed and compared to 1D and 2D PIC OSIRIS simulations. We model the acceleration of protons to GeV energies with tens-of-femtoseconds laser pulses of a few petawatts. The scaling of proton energy with laser power compares favorably to other mechanisms for ultrashort pulses.
[ { "created": "Fri, 21 Feb 2014 17:53:19 GMT", "version": "v1" } ]
2014-02-24
[ [ "Sahai", "Aakash A.", "" ], [ "Tsung", "F. S.", "" ], [ "Tableman", "A. R.", "" ], [ "Mori", "W. B.", "" ], [ "Katsouleas", "T. C.", "" ] ]
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1402.5371
Massimo Cafaro
Massimo Cafaro, Roberto Civino and Barbara Masucci
On the Equivalence of Two Security Notions for Hierarchical Key Assignment Schemes in the Unconditional Setting
null
IEEE Transactions on Dependable and Secure Computing, Volume 12, Issue 4 (2015), pp. 485 - 490
10.1109/TDSC.2014.2355841
null
cs.CR cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The access control problem in a hierarchy can be solved by using a hierarchical key assignment scheme, where each class is assigned an encryption key and some private information. A formal security analysis for hierarchical key assignment schemes has been traditionally considered in two different settings, i.e., the unconditionally secure and the computationally secure setting, and with respect to two different notions: security against key recovery (KR-security) and security with respect to key indistinguishability (KI-security), with the latter notion being cryptographically stronger. Recently, Freire, Paterson and Poettering proposed strong key indistinguishability (SKI-security) as a new security notion in the computationally secure setting, arguing that SKI-security is strictly stronger than KI-security in such a setting. In this paper we consider the unconditionally secure setting for hierarchical key assignment schemes. In such a setting the security of the schemes is not based on specific unproven computational assumptions, i.e., it relies on the theoretical impossibility of breaking them, despite the computational power of an adversary coalition. We prove that, in this setting, SKI-security is not stronger than KI-security, i.e., the two notions are fully equivalent from an information-theoretic point of view.
[ { "created": "Fri, 21 Feb 2014 17:53:58 GMT", "version": "v1" }, { "created": "Thu, 15 May 2014 13:33:11 GMT", "version": "v2" } ]
2015-08-25
[ [ "Cafaro", "Massimo", "" ], [ "Civino", "Roberto", "" ], [ "Masucci", "Barbara", "" ] ]
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1402.5372
Michael Eides
Michael I. Eides and Valery A. Shelyuto
Muon Loop Light-by-Light Contribution to Hyperfine Splitting in Muonium
6 pages, 1 figure
Phys. Rev. Lett. 112, 173004 (2014)
10.1103/PhysRevLett.112.173004
UK/14-01
hep-ph physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Three-loop corrections to hyperfine splitting in muonium generated by the gauge invariant sets of diagrams with muon and tauon loop light-by-light scattering blocks are calculated. These results complete calculations of all light-by-light scattering contributions to hyperfine splitting in muonium.
[ { "created": "Fri, 21 Feb 2014 17:57:55 GMT", "version": "v1" } ]
2014-05-07
[ [ "Eides", "Michael I.", "" ], [ "Shelyuto", "Valery A.", "" ] ]
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1402.5375
James Brannick
J. Brannick, C. Liu, T. Qian, and H. Sun
Diffuse Interface Methods for Multiple Phase Materials: An Energetic Variational Approach
Submitted to Journal of Numerical Mathematics, February 21, 2014
null
null
null
math.AP physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we introduce a diffuse interface model for describing the dynamics of mixtures involving multiple (two or more) phases. The coupled hydrodynamical system is derived through an energetic variational approach. The total energy of the system includes the kinetic energy and the mixing (interfacial) energies. The least action principle (or the principle of virtual work) is applied to derive the conservative part of the dynamics, with a focus on the reversible part of the stress tensor arising from the mixing energies. The dissipative part of the dynamics is then introduced through a dissipation function in the energy law, in line with the Onsager principle of least energy dissipation. The final system, formed by a set of coupled time-dependent partial differential equations, reflects a balance among various conservative and dissipative forces and governs the evolution of velocity and phase fields. To demonstrate the applicability of the proposed model, a few two-dimensional simulations have been carried out, including (1) the force balance at the three-phase contact line in equilibrium, (2) a rising bubble penetrating a fluid-fluid interface, and (3) a solid particle falling in a binary fluid. The effects of slip at solid surface have been examined in connection with contact line motion and a pinch-off phenomenon.
[ { "created": "Fri, 21 Feb 2014 18:05:16 GMT", "version": "v1" } ]
2014-02-24
[ [ "Brannick", "J.", "" ], [ "Liu", "C.", "" ], [ "Qian", "T.", "" ], [ "Sun", "H.", "" ] ]
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1402.5379
Eray Ozkural
Eray \"Ozkural
What Is It Like to Be a Brain Simulation?
10 pages, draft of conference paper published in AGI 2012, also accepted to AISB 2012 but it was too late to arrange travel, unfortunately; Artificial General Intelligence, 5th International Conference, AGI 2012, Oxford, UK, December 8-11, 2012. Proceedings
null
10.1007/978-3-642-35506-6_24
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We frame the question of what kind of subjective experience a brain simulation would have in contrast to a biological brain. We discuss the brain prosthesis thought experiment. We evaluate how the experience of the brain simulation might differ from the biological, according to a number of hypotheses about experience and the properties of simulation. Then, we identify finer questions relating to the original inquiry, and answer them from both a general physicalist, and panexperientialist perspective.
[ { "created": "Sat, 1 Feb 2014 17:19:53 GMT", "version": "v1" } ]
2014-02-24
[ [ "Özkural", "Eray", "" ] ]
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1402.5380
Eray Ozkural
Eray \"Ozkural
Godseed: Benevolent or Malevolent?
null
null
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is hypothesized by some thinkers that benign looking AI objectives may result in powerful AI drives that may pose an existential risk to human society. We analyze this scenario and find the underlying assumptions to be unlikely. We examine the alternative scenario of what happens when universal goals that are not human-centric are used for designing AI agents. We follow a design approach that tries to exclude malevolent motivations from AI agents, however, we see that objectives that seem benevolent may pose significant risk. We consider the following meta-rules: preserve and pervade life and culture, maximize the number of free minds, maximize intelligence, maximize wisdom, maximize energy production, behave like human, seek pleasure, accelerate evolution, survive, maximize control, and maximize capital. We also discuss various solution approaches for benevolent behavior including selfless goals, hybrid designs, Darwinism, universal constraints, semi-autonomy, and generalization of robot laws. A "prime directive" for AI may help in formulating an encompassing constraint for avoiding malicious behavior. We hypothesize that social instincts for autonomous robots may be effective such as attachment learning. We mention multiple beneficial scenarios for an advanced semi-autonomous AGI agent in the near future including space exploration, automation of industries, state functions, and cities. We conclude that a beneficial AI agent with intelligence beyond human-level is possible and has many practical use cases.
[ { "created": "Sat, 1 Feb 2014 17:35:53 GMT", "version": "v1" }, { "created": "Mon, 10 Oct 2016 21:43:51 GMT", "version": "v2" } ]
2016-10-12
[ [ "Özkural", "Eray", "" ] ]
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1402.5381
Pei-Hsun Wang
Pei-Hsun Wang, Yi Xuan, Jian Wang, Xiaoxiao Xue, Daniel E. Leaird, Minghao Qi, and Andrew M. Weiner
Coherent Frequency Comb Generation in a Silicon Nitride Microresonator with Anomalous Dispersion
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physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We observe a transition to a coherent-comb state in a SiN-microresonator with anomalous dispersion. Although ~300 fs pulse trains are generated after line-by-line shaping, the intensity within the microring does not appear to be pulse-like.
[ { "created": "Fri, 21 Feb 2014 18:49:06 GMT", "version": "v1" } ]
2014-02-24
[ [ "Wang", "Pei-Hsun", "" ], [ "Xuan", "Yi", "" ], [ "Wang", "Jian", "" ], [ "Xue", "Xiaoxiao", "" ], [ "Leaird", "Daniel E.", "" ], [ "Qi", "Minghao", "" ], [ "Weiner", "Andrew M.", "" ] ]
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1402.5382
Giuseppe Iurato
Giuseppe Iurato
Pathways of History of Elementary Particle Physics
History of Modern Physics case studies. arXiv admin note: text overlap with arXiv:0902.3360 by other authors
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physics.hist-ph
http://creativecommons.org/licenses/publicdomain/
In this first paper, we briefly retrace some historical pathways of modern physics of 20th Century. In particular, we have considered some moments of cosmic ray physics and, above all, the early theoretical and experimental bases which will lead to the first exact measurements of the anomalous magnetic moment of the muon, one of the main high precision tests of QED.
[ { "created": "Sat, 1 Feb 2014 11:58:37 GMT", "version": "v1" } ]
2014-02-24
[ [ "Iurato", "Giuseppe", "" ] ]
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1402.5388
Alonso Silva
Antonia Maria Masucci (INRIA Paris-Rocquencourt), Alonso Silva (LINCS)
Strategic Resource Allocation for Competitive Influence in Social Networks
null
null
null
null
cs.SI cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
One of the main objectives of data mining is to help companies determine to which potential customers to market and how many resources to allocate to these potential customers. Most previous works on competitive influence in social networks focus on the first issue. In this work, our focus is on the second issue, i.e., we are interested on the competitive influence of marketing campaigns who need to simultaneously decide how many resources to allocate to their potential customers to advertise their products. Using results from game theory, we are able to completely characterize the optimal strategic resource allocation for the voter model of social networks and prove that the price of competition of this game is unbounded. This work is a step towards providing a solid foundation for marketing advertising in more general scenarios.
[ { "created": "Fri, 21 Feb 2014 19:27:05 GMT", "version": "v1" } ]
2014-02-24
[ [ "Masucci", "Antonia Maria", "", "INRIA Paris-Rocquencourt" ], [ "Silva", "Alonso", "", "LINCS" ] ]
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1402.5390
Guillaume Salbreux
Kai Dierkes and Angughali Sumi and J\'er\^ome Solon and Guillaume Salbreux
Spontaneous oscillations from turnover of an elastic contractile material
10 pages, 5 figures
null
null
null
physics.bio-ph cond-mat.soft q-bio.CB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Single and collective cellular oscillations involving the actomyosin cytoskeleton have been observed in numerous biological systems. We show here that a generic model of a contractile material, which is turning over and contracts against an elastic element, exhibits spontaneous oscillations. Such a model can thus account for shape oscillations observed in amnioserosa cells during dorsal closure of the Drosophila embryo. We investigate the collective dynamics of an ensemble of such oscillators and show that the relative contribution of viscous and friction losses yield different regimes of collective oscillations. Taking into account the diffusion of contractile elements, our theoretical framework predicts the appearance of traveling waves which might account for the propagation of actomyosin contractile waves observed during morphogenesis.
[ { "created": "Fri, 21 Feb 2014 19:30:21 GMT", "version": "v1" } ]
2014-02-24
[ [ "Dierkes", "Kai", "" ], [ "Sumi", "Angughali", "" ], [ "Solon", "Jérôme", "" ], [ "Salbreux", "Guillaume", "" ] ]
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1402.5391
Ana Bu\v{s}i\'c
Ana Bu\v{s}i\'c and Emilie Coupechoux
Exact Simulation for Assemble-To-Order Systems
null
null
null
null
math.PR cs.PF
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop exact simulation (also known as perfect sampling) algorithms for a family of assemble-to-order systems. Due to the finite capacity, and coupling in demands and replenishments, known solving techniques are inefficient for larger problem instances. We first consider the case with individual replenishments of items, and derive an event based representation of the Markov chain that allows applying existing exact simulation techniques, using the monotonicity properties or bounding chains. In the case of joint replenishments, the state space becomes intractable for the existing methods. We propose new exact simulation algorithms, based on aggregation and bounding chains, that allow a significant reduction of the state space of the Markov chain. We also discuss the coupling times of considered models and provide sufficient conditions for linear (in the single server replenishment case) or quadratic (many server case) complexity of our algorithms in terms of the total capacity in the system.
[ { "created": "Fri, 21 Feb 2014 19:40:38 GMT", "version": "v1" } ]
2014-02-24
[ [ "Bušić", "Ana", "" ], [ "Coupechoux", "Emilie", "" ] ]
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1402.5401
Klaus von Haeften
Gediminas Galinis, Cephise Cacho, Richard T. Chapman, Andrew M. Ellis, Marius Lewerenz, Luis G. Mendoza Luna, Russell S. Minns, Mirjana Mladenovic, Arnaud Rouz\'ee, Emma Springate, I. C. Edmond Turcu, Mark J. Watkins, Klaus von Haeften
Probing the structure and dynamics of molecular clusters using rotational wavepackets
5 pages, 6 figures
null
10.1103/PhysRevLett.113.043004
null
physics.atm-clus physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The chemical and physical properties of molecular clusters can heavily depend on their size, which makes them very attractive for the design of new materials with tailored properties. Deriving the structure and dynamics of clusters is therefore of major interest in science. Weakly bound clusters can be studied using conventional spectroscopic techniques, but the number of lines observed is often too small for a comprehensive structural analysis. Impulsive alignment generates rotational wavepackets, which provides simultaneous information on structure and dynamics, as has been demonstrated successfully for isolated molecules. Here, we apply this technique for the firsttime to clusters comprising of a molecule and a single helium atom. By forcing the population of high rotational levels in intense laser fields we demonstrate the generation of rich rotational line spectra for this system, establishing the highly delocalised structure and the coherence of rotational wavepacket propagation. Our findings enable studies of clusters of different sizes and complexity as well as incipient superfluidity effects using wavepacket methods.
[ { "created": "Fri, 21 Feb 2014 20:27:51 GMT", "version": "v1" } ]
2015-06-18
[ [ "Galinis", "Gediminas", "" ], [ "Cacho", "Cephise", "" ], [ "Chapman", "Richard T.", "" ], [ "Ellis", "Andrew M.", "" ], [ "Lewerenz", "Marius", "" ], [ "Luna", "Luis G. Mendoza", "" ], [ "Minns", "Russell S.", "" ], [ "Mladenovic", "Mirjana", "" ], [ "Rouzée", "Arnaud", "" ], [ "Springate", "Emma", "" ], [ "Turcu", "I. C. Edmond", "" ], [ "Watkins", "Mark J.", "" ], [ "von Haeften", "Klaus", "" ] ]
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1402.5408
Benjamin Dreyfus
Benjamin W. Dreyfus, Vashti Sawtelle, Chandra Turpen, Julia Gouvea, and Edward F. Redish
A Vision of Interdisciplinary Education: Students' Reasoning about "High-Energy Bonds" and ATP
16 pages
Phys. Rev. ST Phys. Educ. Res 10, 010115 (2014)
10.1103/PhysRevSTPER.10.010115
null
physics.ed-ph physics.bio-ph physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As interdisciplinary courses are developed, instructors and researchers have to grapple with questions of how students should make connections across disciplines. We explore the issue of interdisciplinary reconciliation (IDR): how students reconcile seemingly contradictory ideas from different disciplines. While IDR has elements in common with other frameworks for the reconciliation of ideas across contexts, it differs in that each disciplinary idea is considered canonically correct within its own discipline. The setting for the research is an introductory physics course for biology majors that seeks to build greater interdisciplinary coherence and therefore includes biologically relevant topics such as ATP and chemical bond energy. In our case-study data, students grapple with the apparent contradiction between the energy released when the phosphate bond in ATP is broken and the idea that an energy input is required to break a bond. We see students justifying context-dependent modeling choices, showing nuance in articulating how system choices may be related to disciplinary problems of interest. This represents a desired endpoint of IDR, in which students can build coherent connections between concepts from different disciplines while understanding each concept in its own disciplinary context. Our case study also illustrates elements of the instructional environment that play roles in the process of IDR.
[ { "created": "Fri, 21 Feb 2014 20:57:28 GMT", "version": "v1" } ]
2014-05-14
[ [ "Dreyfus", "Benjamin W.", "" ], [ "Sawtelle", "Vashti", "" ], [ "Turpen", "Chandra", "" ], [ "Gouvea", "Julia", "" ], [ "Redish", "Edward F.", "" ] ]
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1402.5422
Mu Li
Mu Li and Vishal Monga
Twofold Video Hashing with Automatic Synchronization
submitted to Image Processing (ICIP), 2014 21st IEEE International Conference on
null
null
null
cs.MM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Video hashing finds a wide array of applications in content authentication, robust retrieval and anti-piracy search. While much of the existing research has focused on extracting robust and secure content descriptors, a significant open challenge still remains: Most existing video hashing methods are fallible to temporal desynchronization. That is, when the query video results by deleting or inserting some frames from the reference video, most existing methods assume the positions of the deleted (or inserted) frames are either perfectly known or reliably estimated. This assumption may be okay under typical transcoding and frame-rate changes but is highly inappropriate in adversarial scenarios such as anti-piracy video search. For example, an illegal uploader will try to bypass the 'piracy check' mechanism of YouTube/Dailymotion etc by performing a cleverly designed non-uniform resampling of the video. We present a new solution based on dynamic time warping (DTW), which can implement automatic synchronization and can be used together with existing video hashing methods. The second contribution of this paper is to propose a new robust feature extraction method called flow hashing (FH), based on frame averaging and optical flow descriptors. Finally, a fusion mechanism called distance boosting is proposed to combine the information extracted by DTW and FH. Experiments on real video collections show that such a hash extraction and comparison enables unprecedented robustness under both spatial and temporal attacks.
[ { "created": "Fri, 21 Feb 2014 21:02:01 GMT", "version": "v1" } ]
2014-02-25
[ [ "Li", "Mu", "" ], [ "Monga", "Vishal", "" ] ]
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1402.5428
Khalid Jebari hassani
Khalid jebari, Mohammed Madiafi and Abdelaziz Elmoujahid
An Evolutionary approach for solving Shr\"odinger Equation
arXiv admin note: substantial text overlap with arXiv:1401.0523
null
null
null
cs.NE
http://creativecommons.org/licenses/by/3.0/
The purpose of this paper is to present a method of solving the Shr\"odinger Equation (SE) by Genetic Algorithms and Grammatical Evolution. The method forms generations of trial solutions expressed in an analytical form. We illustrate the effectiveness of this method providing, for example, the results of its application to a quantum system minimal energy, and we compare these results with those produced by traditional analytical methods
[ { "created": "Fri, 21 Feb 2014 21:18:58 GMT", "version": "v1" } ]
2014-02-25
[ [ "jebari", "Khalid", "" ], [ "Madiafi", "Mohammed", "" ], [ "Elmoujahid", "Abdelaziz", "" ] ]
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1402.5433
Fang Liu
Fang Liu, Lin Lin, Derek Vigil-Fowler, Johannes Lischner, Alexander F. Kemper, Sahar Sharifzadeh, Felipe Homrich da Jornada, Jack Deslippe, Chao Yang, Jeffrey B. Neaton, Steven G. Louie
Numerical integration for ab initio many-electron self energy calculations within the GW approximation
22 pages, 9 figures
null
10.1016/j.jcp.2015.01.023
null
physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a numerical integration scheme for evaluating the convolution of a Green's function with a screened Coulomb potential on the real axis in the GW approximation of the self energy. Our scheme takes the zero broadening limit in Green's function first, replaces the numerator of the integrand with a piecewise polynomial approximation, and performs principal value integration on subintervals analytically. We give the error bound of our numerical integration scheme and show by numerical examples that it is more reliable and accurate than the standard quadrature rules such as the composite trapezoidal rule. We also discuss the benefit of using different self energy expressions to perform the numerical convolution at different frequencies.
[ { "created": "Fri, 21 Feb 2014 21:56:13 GMT", "version": "v1" } ]
2015-05-20
[ [ "Liu", "Fang", "" ], [ "Lin", "Lin", "" ], [ "Vigil-Fowler", "Derek", "" ], [ "Lischner", "Johannes", "" ], [ "Kemper", "Alexander F.", "" ], [ "Sharifzadeh", "Sahar", "" ], [ "da Jornada", "Felipe Homrich", "" ], [ "Deslippe", "Jack", "" ], [ "Yang", "Chao", "" ], [ "Neaton", "Jeffrey B.", "" ], [ "Louie", "Steven G.", "" ] ]
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1402.5436
Alessandro Provetti
Gianpaolo Brignoli, Stefania Costantini, Ottavio D'Antona, Alessandro Provetti
Characterizing and computing stable models of logic programs: The non-stratified case
Proceedings of the Conference on Information Technology. Bhubaneswar, India, 1999. https://sites.google.com/site/citconference/
null
null
null
cs.AI cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Stable Logic Programming (SLP) is an emergent, alternative style of logic programming: each solution to a problem is represented by a stable model of a deductive database/function-free logic program encoding the problem itself. Several implementations now exist for stable logic programming, and their performance is rapidly improving. To make SLP generally applicable, it should be possible to check for consistency (i.e., existence of stable models) of the input program before attempting to answer queries. In the literature, only rather strong sufficient conditions have been proposed for consistency, e.g., stratification. This paper extends these results in several directions. First, the syntactic features of programs, viz. cyclic negative dependencies, affecting the existence of stable models are characterized, and their relevance is discussed. Next, a new graph representation of logic programs, the Extended Dependency Graph (EDG), is introduced, which conveys enough information for reasoning about stable models (while the traditional Dependency Graph does not). Finally, we show that the problem of the existence of stable models can be reformulated in terms of coloring of the EDG.
[ { "created": "Fri, 21 Feb 2014 22:17:39 GMT", "version": "v1" } ]
2014-02-25
[ [ "Brignoli", "Gianpaolo", "" ], [ "Costantini", "Stefania", "" ], [ "D'Antona", "Ottavio", "" ], [ "Provetti", "Alessandro", "" ] ]
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1402.5438
Xiaoxiao Xue
Xiaoxiao Xue, Yi Xuan, Pei-Hsun Wang, Jian Wang, Dan E. Leaird, Minghao Qi, and Andrew M. Weiner
Tunable Frequency Comb Generation from a Microring with a Thermal Heater
submitted to CLEO2014
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate a novel comb tuning method for microresonator-based Kerr comb generators. Continuously tunable, low-noise, and coherent comb generation is achieved in a CMOS-compatible silicon nitride microring resonator.
[ { "created": "Fri, 21 Feb 2014 22:19:08 GMT", "version": "v1" } ]
2014-02-25
[ [ "Xue", "Xiaoxiao", "" ], [ "Xuan", "Yi", "" ], [ "Wang", "Pei-Hsun", "" ], [ "Wang", "Jian", "" ], [ "Leaird", "Dan E.", "" ], [ "Qi", "Minghao", "" ], [ "Weiner", "Andrew M.", "" ] ]
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1402.5439
Agnese Callegari
Agnese Callegari and Mite Mijalkov and A. Burak G\"ok\"oz and Giovanni Volpe
Computational toolbox for optical tweezers in geometrical optics
9 pages, 8 figures
null
10.1364/JOSAB.32.000B11
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Optical tweezers have found widespread application in many fields, from physics to biology. Here, we explain in detail how optical forces and torques can be described within the geometrical optics approximation and we show that this approximation provides reliable results in agreement with experiments for particles whose characteristic dimensions are larger than the wavelength of the trapping light. Furthermore, we provide an object-oriented software package implemented in MatLab for the calculation of optical forces and torques in the geometrical optics regime: \texttt{OTGO - Optical Tweezers in Geometrical Optics}. We provide all source codes for \texttt{OTGO} as well as the documentation and code examples -- e.g., standard optical tweezers, optical tweezers with elongated particle, windmill effect, Kramers transitions between two optical traps -- necessary to enable users to effectively employ it in their research and teaching.
[ { "created": "Fri, 21 Feb 2014 22:29:13 GMT", "version": "v1" } ]
2015-06-18
[ [ "Callegari", "Agnese", "" ], [ "Mijalkov", "Mite", "" ], [ "Gököz", "A. Burak", "" ], [ "Volpe", "Giovanni", "" ] ]
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1402.5440
Youyi Zheng
Youyi Zheng and Julie Dorsey and Niloy Mitra
Ergonomic-driven Geometric Exploration and Reshaping
null
null
null
null
cs.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper addresses the following problem: given a set of man-made shapes, e.g., chairs, can we quickly rank and explore the set of shapes with respect to a given avatar pose? Answering this question requires identifying which shapes are more suitable for the defined avatar and pose; and moreover, to provide fast preview of how to alter the input geometry to better fit the deformed shapes to the given avatar pose? The problem naturally links physical proportions of human body and its interaction with object shapes in an attempt to connect ergonomics with shape geometry. We designed an interaction system that allows users to explore shape collections using the deformation of human characters while at the same time providing interactive previews of how to alter the shapes to better fit the user-specified character. We achieve this by first mapping ergonomics guidelines into a set of simultaneous multi-part constraints based on target contacts; and then, proposing a novel contact-based deformation model to realize multi-contact constraints. We evaluate our framework on various chair models and validate the results via a small user study.
[ { "created": "Fri, 21 Feb 2014 22:31:26 GMT", "version": "v1" } ]
2014-02-25
[ [ "Zheng", "Youyi", "" ], [ "Dorsey", "Julie", "" ], [ "Mitra", "Niloy", "" ] ]
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1402.5442
Enrique Galvez
Enrique J. Galvez, Brett L. Rojec, Vijay Kumar and Nirmal K. Viswanathan
Generation of isolated asymmetric umbilics in light's polarization
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null
10.1103/PhysRevA.89.031801
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Polarization-singularity C-points, a form of line singularities, are the vectorial counterparts of the optical vortices of spatial modes and fundamental optical features of polarization-spatial modes. Their generation in tailored beams has been limited to lemon and star C-points that contain symmetric dislocations in state-of-polarization patterns. In this article we present the theory and laboratory measurements of two complementary methods to generate isolated asymmetric C-points in tailored beams, of which symmetric lemons and stars are limiting cases; and we report on the generation of monstars, an asymmetric C-point with characteristics of both lemons and stars.
[ { "created": "Fri, 21 Feb 2014 22:48:25 GMT", "version": "v1" } ]
2015-06-18
[ [ "Galvez", "Enrique J.", "" ], [ "Rojec", "Brett L.", "" ], [ "Kumar", "Vijay", "" ], [ "Viswanathan", "Nirmal K.", "" ] ]
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1402.5443
Lilian Weng
Lilian Weng, Filippo Menczer
Topicality and Social Impact: Diverse Messages but Focused Messengers
9 pages, 7 figures, 6 tables
null
10.1371/journal.pone.0118410
null
cs.SI cs.CY physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Are users who comment on a variety of matters more likely to achieve high influence than those who delve into one focused field? Do general Twitter hashtags, such as #lol, tend to be more popular than novel ones, such as #instantlyinlove? Questions like these demand a way to detect topics hidden behind messages associated with an individual or a hashtag, and a gauge of similarity among these topics. Here we develop such an approach to identify clusters of similar hashtags by detecting communities in the hashtag co-occurrence network. Then the topical diversity of a user's interests is quantified by the entropy of her hashtags across different topic clusters. A similar measure is applied to hashtags, based on co-occurring tags. We find that high topical diversity of early adopters or co-occurring tags implies high future popularity of hashtags. In contrast, low diversity helps an individual accumulate social influence. In short, diverse messages and focused messengers are more likely to gain impact.
[ { "created": "Fri, 21 Feb 2014 22:49:04 GMT", "version": "v1" } ]
2015-06-18
[ [ "Weng", "Lilian", "" ], [ "Menczer", "Filippo", "" ] ]
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1402.5444
Aurora Pribram-Jones
Aurora Pribram-Jones, Zeng-hui Yang, John R. Trail, Kieron Burke, Richard J. Needs, Carsten A. Ullrich
Excitations and benchmark ensemble density functional theory for two electrons
15 pages, supplemental material pdf
J. Chem. Phys. 140, 18A541 (2014)
10.1063/1.4872255
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new method for extracting ensemble Kohn-Sham potentials from accurate excited state densities is applied to a variety of two electron systems, exploring the behavior of exact ensemble density functional theory. The issue of separating the Hartree energy and the choice of degenerate eigenstates is explored. A new approximation, spin eigenstate Hartree-exchange (SEHX), is derived. Exact conditions that are proven include the signs of the correlation energy components, the virial theorem for both exchange and correlation, and the asymptotic behavior of the potential for small weights of the excited states. Many energy components are given as a function of the weights for two electrons in a one-dimensional flat box, in a box with a large barrier to create charge transfer excitations, in a three-dimensional harmonic well (Hooke's atom), and for the He atom singlet-triplet ensemble, singlet-triplet-singlet ensemble, and triplet bi-ensemble.
[ { "created": "Fri, 21 Feb 2014 23:00:09 GMT", "version": "v1" }, { "created": "Tue, 25 Feb 2014 01:40:06 GMT", "version": "v2" } ]
2014-06-02
[ [ "Pribram-Jones", "Aurora", "" ], [ "Yang", "Zeng-hui", "" ], [ "Trail", "John R.", "" ], [ "Burke", "Kieron", "" ], [ "Needs", "Richard J.", "" ], [ "Ullrich", "Carsten A.", "" ] ]
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1402.5448
Imran Mohamed
Imran Mohamed, Giampaolo Pisano, and Ming Wah Ng
W-Band Pancharatnam Half Wave Plate Based on Negative Refractive Index Metamaterials
7 pages, 10 figures. Accepted on 2014-02-18 for publication in Applied Optics. This paper is made available as an electronic reprint with the permission of OSA
Applied Optics, Vol. 53, Issue 10, pp. 2001-2006 (2014)
10.1364/AO.53.002001
uk-ac-man-scw:225266
physics.ins-det astro-ph.IM physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Electromagnetic metamaterials, made from arrangements of subwavelength sized structures, can be used to manipulate radiation. Designing metamaterials that have a positive refractive index along one axis and a negative refractive index along the orthogonal axis can result in birefringences, $\Delta n>1$. The effect can be used to create wave plates with subwavelength thicknesses. Previous attempts at making wave plates in this way have resulted in very narrow usable bandwidths. In this paper, we use the Pancharatnam method to increase the usable bandwidth. A combination of Finite Element Method and Transmission Line models were used to optimise the final design. Experimental results are compared to the modelled data.
[ { "created": "Fri, 21 Feb 2014 23:31:47 GMT", "version": "v1" } ]
2015-01-07
[ [ "Mohamed", "Imran", "" ], [ "Pisano", "Giampaolo", "" ], [ "Ng", "Ming Wah", "" ] ]
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1402.5449
Igor Shparlinski
Joachim von zur Gathen and Igor E. Shparlinski
Circulant graphs and GCD and LCM of Subsets
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cs.CC math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given two sets $A$ and $B$ of integers, we consider the problem of finding a set $S \subseteq A$ of the smallest possible cardinality such the greatest common divisor of the elements of $S \cup B$ equals that of those of $A \cup B$. The particular cases of $B = \emptyset$ and $\#B = 1$ are of special interest and have some links with graph theory. We also consider the corresponding question for the least common multiple of the elements. We establish NP-completeness and approximation results for these problems by relating them to the Minimum Cover Problem.
[ { "created": "Fri, 21 Feb 2014 23:34:31 GMT", "version": "v1" } ]
2014-02-25
[ [ "Gathen", "Joachim von zur", "" ], [ "Shparlinski", "Igor E.", "" ] ]
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1402.5450
Nicholas Rotella
Nicholas Rotella, Michael Bloesch, Ludovic Righetti and Stefan Schaal
State Estimation for a Humanoid Robot
IROS 2014 Submission, IEEE/RSJ International Conference on Intelligent Robots and Systems (2014) 952-958
null
10.1109/IROS.2014.6942674
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper introduces a framework for state estimation on a humanoid robot platform using only common proprioceptive sensors and knowledge of leg kinematics. The presented approach extends that detailed in [1] on a quadruped platform by incorporating the rotational constraints imposed by the humanoid's flat feet. As in previous work, the proposed Extended Kalman Filter (EKF) accommodates contact switching and makes no assumptions about gait or terrain, making it applicable on any humanoid platform for use in any task. The filter employs a sensor-based prediction model which uses inertial data from an IMU and corrects for integrated error using a kinematics-based measurement model which relies on joint encoders and a kinematic model to determine the relative position and orientation of the feet. A nonlinear observability analysis is performed on both the original and updated filters and it is concluded that the new filter significantly simplifies singular cases and improves the observability characteristics of the system. Results on simulated walking and squatting datasets demonstrate the performance gain of the flat-foot filter as well as confirm the results of the presented observability analysis.
[ { "created": "Fri, 21 Feb 2014 23:35:34 GMT", "version": "v1" }, { "created": "Wed, 10 Dec 2014 20:42:58 GMT", "version": "v2" } ]
2014-12-11
[ [ "Rotella", "Nicholas", "" ], [ "Bloesch", "Michael", "" ], [ "Righetti", "Ludovic", "" ], [ "Schaal", "Stefan", "" ] ]
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1402.5456
Wayes Tushar
Wayes Tushar, Bo Chai, Chau Yuen, David B. Smith and H. Vincent Poor
Energy Management for a User Interactive Smart Community: A Stackelberg Game Approach
6 pages, 4 figures
null
null
null
cs.SY cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies a three party energy management problem in a user interactive smart community that consists of a large number of residential units (RUs) with distributed energy resources (DERs), a shared facility controller (SFC) and the main grid. A Stackelberg game is formulated to benefit both the SFC and RUs, in terms of incurred cost and achieved utility respectively, from their energy trading with each other and the grid. The properties of the game are studied and it is shown that there exists a unique Stackelberg equilibrium (SE). A novel algorithm is proposed that can be implemented in a distributed fashion by both RUs and the SFC to reach the SE. The convergence of the algorithm is also proven, and shown to always reach the SE. Numerical examples are used to assess the properties and effectiveness of the proposed scheme.
[ { "created": "Sat, 22 Feb 2014 00:44:40 GMT", "version": "v1" } ]
2014-02-25
[ [ "Tushar", "Wayes", "" ], [ "Chai", "Bo", "" ], [ "Yuen", "Chau", "" ], [ "Smith", "David B.", "" ], [ "Poor", "H. Vincent", "" ] ]
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1402.5458
Sindhu Kutty
Jacob Abernethy, Sindhu Kutty, S\'ebastien Lahaie, Rahul Sami
Information Aggregation in Exponential Family Markets
null
null
null
null
cs.AI cs.GT stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the design of prediction market mechanisms known as automated market makers. We show that we can design these mechanisms via the mold of \emph{exponential family distributions}, a popular and well-studied probability distribution template used in statistics. We give a full development of this relationship and explore a range of benefits. We draw connections between the information aggregation of market prices and the belief aggregation of learning agents that rely on exponential family distributions. We develop a very natural analysis of the market behavior as well as the price equilibrium under the assumption that the traders exhibit risk aversion according to exponential utility. We also consider similar aspects under alternative models, such as when traders are budget constrained.
[ { "created": "Sat, 22 Feb 2014 01:11:05 GMT", "version": "v1" } ]
2014-02-25
[ [ "Abernethy", "Jacob", "" ], [ "Kutty", "Sindhu", "" ], [ "Lahaie", "Sébastien", "" ], [ "Sami", "Rahul", "" ] ]
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1402.5461
Dinesh Rabindran
Dinesh Rabindran
Preliminary Studies on Force/Motion Control of Intelligent Mechanical Systems
Masters Thesis, Mechanical Engineering Department, The University of Texas at Austin, 2004
null
null
null
cs.RO
http://creativecommons.org/licenses/by-nc-sa/3.0/
To rationalize the relatively high investment that industrial automation systems entail, research in the field of intelligent machines should target high value functions such as fettling, die-finishing, deburring, and fixtureless manufacturing. For achieving this goal, past work has concentrated on force control algorithms at the system level with limited focus on performance expansion at the actuator level. We present a comprehensive literature review on robot force control, including algorithms, specialized actuators, and robot control software. A robot force control testbed was developed using Schunk's PowerCube 6-DOF Arm and a six-axis ATI force/torque sensor. Using parameter identification experiments, manipulator module inertias and the motor torque constant were estimated. Experiments were conducted to study the practical issues involved in implementing stable contact transitions and programmable endpoint impedance. Applications to human augmentation, virtual fixtures, and teleoperation are discussed. These experiments are used as a vehicle to understand the performance improvement achievable at the actuator level. The approach at UTRRG has been to maximize the choices within the actuator to enhance its intelligence. Drawing on this 20-year research history in electromechanical actuator architecture, we propose a new concept that mixes two inputs, distinct in their velocity ratios, within the same dual actuator called a Force/Motion Actuator (FMA). Detailed kinematic and dynamic models of this dual actuator are developed. The actuator performance is evaluated using simulations with an output velocity specification and resolving input trajectories using a minimum-norm solution. It is shown that a design choice of 14:1 motion scaling between the two inputs results in good sensitivity to output force disturbances without compromising velocity tracking performance.
[ { "created": "Sat, 22 Feb 2014 02:03:24 GMT", "version": "v1" } ]
2014-02-25
[ [ "Rabindran", "Dinesh", "" ] ]
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1402.5466
Chanabasayya Vastrad M
Doreswamy, Chanabasyya M. Vastrad
Predictive Comparative QSAR analysis of Sulfathiazole Analogues as Mycobacterium Tuberculosis H37RV Inhabitors
arXiv admin note: substantial text overlap with arXiv:1312.2841
published 2012
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null
cs.CE q-bio.QM
http://creativecommons.org/licenses/by/3.0/
Antitubercular activity of Sulfathiazole Derivitives series were subjected to Quantitative Structure Activity Relationship (QSAR) Analysis with an attempt to derive and understand a correlation between the Biologically Activity as dependent variable and various descriptors as independent variables. QSAR models generated using 28 compounds. Several statistical regression expressions were obtained using Partial Least Squares (PLS) Regression, Multiple Linear Regression (MLR) and Principal Component Regression (PCR) methods. The among these methods, Partial Least Square Regression (PLS) method has shown very promising result as compare to other two methods. A QSAR model was generated by a training set of 18 molecules with correlation coefficient r (r square) of 0.9191, significant cross validated correlation coefficient (q square) of 0.8300, F test of 53.5783, r square for external test set pred_r square -3.6132, coefficient of correlation of predicted data set pred_r_se square 1.4859 and degree of freedom 14 by Partial Least Squares Regression Method.
[ { "created": "Sat, 22 Feb 2014 02:52:52 GMT", "version": "v1" } ]
2014-02-25
[ [ "Doreswamy", "", "" ], [ "Vastrad", "Chanabasyya M.", "" ] ]
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1402.5468
Ji King
Ji King
Uncertainty Principle in Control Theory, Part I: Analysis of Performance Limitations
20 pages, 6 figures
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper investigates performance limitations and tradeoffs in the control design for linear time-invariant systems. It is shown that control specifications in time domain and in frequency domain are always mutually exclusive determined by uncertainty relations. The uncertainty principle from quantum mechanics and harmonic analysis therefore embeds itself inherently in control theory. The relations among transient specifications, system bandwidth and control energy are obtained within the framework of uncertainty principle. If the control system is provided with a large bandwidth or great control energy, then it can ensure transient specifications as good as it can be. Such a control system could be approximated by prolate spheroidal wave functions. The obtained results are also applicable to filter design due to the duality of filtering and control.
[ { "created": "Sat, 22 Feb 2014 03:15:54 GMT", "version": "v1" } ]
2014-02-25
[ [ "King", "Ji", "" ] ]
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1402.5472
Jianqin Zhou
Jianqin Zhou, Wanquan Liu, Guanglu Zhou
On the $k$-error linear complexity for $p^n$-periodic binary sequences via hypercube theory
16 pages. arXiv admin note: substantial text overlap with arXiv:1309.1829, arXiv:1312.6927
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cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The linear complexity and the $k$-error linear complexity of a binary sequence are important security measures for key stream strength. By studying binary sequences with the minimum Hamming weight, a new tool named as hypercube theory is developed for $p^n$-periodic binary sequences. In fact, hypercube theory is based on a typical sequence decomposition and it is a very important tool in investigating the critical error linear complexity spectrum proposed by Etzion et al. To demonstrate the importance of hypercube theory, we first give a standard hypercube decomposition based on a well-known algorithm for computing linear complexity and show that the linear complexity of the first hypercube in the decomposition is equal to the linear complexity of the original sequence. Second, based on such decomposition, we give a complete characterization for the first decrease of the linear complexity for a $p^n$-periodic binary sequence $s$. This significantly improves the current existing results in literature. As to the importance of the hypercube, we finally derive a counting formula for the $m$-hypercubes with the same linear complexity.
[ { "created": "Sat, 22 Feb 2014 03:26:54 GMT", "version": "v1" }, { "created": "Tue, 12 Aug 2014 02:35:45 GMT", "version": "v2" } ]
2014-08-13
[ [ "Zhou", "Jianqin", "" ], [ "Liu", "Wanquan", "" ], [ "Zhou", "Guanglu", "" ] ]
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1402.5475
Huazi Zhang
Xiao Cai, Zhaoyang Zhang, Huazi Zhang, Chunguang Li
Soft Consistency Reconstruction: A Robust 1-bit Compressive Sensing Algorithm
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A class of recovering algorithms for 1-bit compressive sensing (CS) named Soft Consistency Reconstructions (SCRs) are proposed. Recognizing that CS recovery is essentially an optimization problem, we endeavor to improve the characteristics of the objective function under noisy environments. With a family of re-designed consistency criteria, SCRs achieve remarkable counter-noise performance gain over the existing counterparts, thus acquiring the desired robustness in many real-world applications. The benefits of soft decisions are exemplified through structural analysis of the objective function, with intuition described for better understanding. As expected, through comparisons with existing methods in simulations, SCRs demonstrate preferable robustness against noise in low signal-to-noise ratio (SNR) regime, while maintaining comparable performance in high SNR regime.
[ { "created": "Sat, 22 Feb 2014 04:12:51 GMT", "version": "v1" } ]
2014-02-25
[ [ "Cai", "Xiao", "" ], [ "Zhang", "Zhaoyang", "" ], [ "Zhang", "Huazi", "" ], [ "Li", "Chunguang", "" ] ]
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1402.5477
Huazi Zhang
Huazi Zhang, Zhaoyang Zhang, Huaiyu Dai
Mobile Conductance and Gossip-based Information Spreading in Mobile Networks
arXiv admin note: substantial text overlap with arXiv:1202.2586
null
null
null
cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we propose a general analytical framework for information spreading in mobile networks based on a new performance metric, mobile conductance, which allows us to separate the details of mobility models from the study of mobile spreading time. We derive a general result for the information spreading time in mobile networks in terms of this new metric, and instantiate it through several popular mobility models. Large scale network simulation is conducted to verify our analysis.
[ { "created": "Sat, 22 Feb 2014 04:35:09 GMT", "version": "v1" } ]
2014-02-25
[ [ "Zhang", "Huazi", "" ], [ "Zhang", "Zhaoyang", "" ], [ "Dai", "Huaiyu", "" ] ]
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1402.5478
Prathamesh Shenai
Yang Zhao, Yao Yao, Vladimir Chernyak, Yang Zhao
Spin-Boson Model with Diagonal and Off-Diagonal Coupling to Two Independent Baths: Ground-State Phase Transition in the Deep Sub-Ohmic Regime
4 pages, 4 figures
J. Chem. Phys. 140, 161105 (2014)
10.1063/1.4873351
null
quant-ph cond-mat.str-el physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate a spin-boson model with two boson baths that are coupled to two perpendicular components of the spin by employing the density matrix renormalization group method with an optimized boson basis. It is revealed that in the deep sub-Ohmic regime there exists a novel second-order phase transition between two types of doubly degenerate states, which is reduced to one of the usual type for nonzero tunneling. In addition, it is found that expectation values of the spin components display jumps at the phase boundary in the absence of bias and tunneling.
[ { "created": "Sat, 22 Feb 2014 04:46:21 GMT", "version": "v1" } ]
2014-04-30
[ [ "Zhao", "Yang", "" ], [ "Yao", "Yao", "" ], [ "Chernyak", "Vladimir", "" ], [ "Zhao", "Yang", "" ] ]
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1402.5481
Nathan Kallus
Dimitris Bertsimas, Nathan Kallus
From Predictive to Prescriptive Analytics
null
null
null
null
stat.ML cs.LG math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we combine ideas from machine learning (ML) and operations research and management science (OR/MS) in developing a framework, along with specific methods, for using data to prescribe optimal decisions in OR/MS problems. In a departure from other work on data-driven optimization and reflecting our practical experience with the data available in applications of OR/MS, we consider data consisting, not only of observations of quantities with direct effect on costs/revenues, such as demand or returns, but predominantly of observations of associated auxiliary quantities. The main problem of interest is a conditional stochastic optimization problem, given imperfect observations, where the joint probability distributions that specify the problem are unknown. We demonstrate that our proposed solution methods, which are inspired by ML methods such as local regression, CART, and random forests, are generally applicable to a wide range of decision problems. We prove that they are tractable and asymptotically optimal even when data is not iid and may be censored. We extend this to the case where decision variables may directly affect uncertainty in unknown ways, such as pricing's effect on demand. As an analogue to R^2, we develop a metric P termed the coefficient of prescriptiveness to measure the prescriptive content of data and the efficacy of a policy from an operations perspective. To demonstrate the power of our approach in a real-world setting we study an inventory management problem faced by the distribution arm of an international media conglomerate, which ships an average of 1bil units per year. We leverage internal data and public online data harvested from IMDb, Rotten Tomatoes, and Google to prescribe operational decisions that outperform baseline measures. Specifically, the data we collect, leveraged by our methods, accounts for an 88\% improvement as measured by our P.
[ { "created": "Sat, 22 Feb 2014 05:10:56 GMT", "version": "v1" }, { "created": "Thu, 26 Jun 2014 17:25:20 GMT", "version": "v2" }, { "created": "Mon, 9 Feb 2015 20:07:10 GMT", "version": "v3" }, { "created": "Thu, 19 Jul 2018 15:36:29 GMT", "version": "v4" } ]
2018-07-20
[ [ "Bertsimas", "Dimitris", "" ], [ "Kallus", "Nathan", "" ] ]
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From Predictive to Prescriptive Analytics
http://arxiv.org/abs/1402.5481v4
http://arxiv.org/pdf/1402.5481v4.pdf
https://github.com/yf-yang/Portfolio-Optimization
false
false
https://paperswithcode.com/paper/from-predictive-to-prescriptive-analytics
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1402.5483
Huazi Zhang
Huazi Zhang, Zhaoyang Zhang, Xiaoming Chen, Rui Yin
Energy Efficient Joint Source and Channel Sensing in Cognitive Radio Sensor Networks
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A novel concept of Joint Source and Channel Sensing (JSCS) is introduced in the context of Cognitive Radio Sensor Networks (CRSN). Every sensor node has two basic tasks: application-oriented source sensing and ambient-oriented channel sensing. The former is to collect the application-specific source information and deliver it to the access point within some limit of distortion, while the latter is to find the vacant channels and provide spectrum access opportunities for the sensed source information. With in-depth exploration, we find that these two tasks are actually interrelated when taking into account the energy constraints. The main focus of this paper is to minimize the total power consumed by these two tasks while bounding the distortion of the application-specific source information. Firstly, we present a specific slotted sensing and transmission scheme, and establish the multi-task power consumption model. Secondly, we jointly analyze the interplay between these two sensing tasks, and then propose a proper sensing and power allocation scheme to minimize the total power consumption. Finally, Simulation results are given to validate the proposed scheme.
[ { "created": "Sat, 22 Feb 2014 05:38:40 GMT", "version": "v1" } ]
2014-02-25
[ [ "Zhang", "Huazi", "" ], [ "Zhang", "Zhaoyang", "" ], [ "Chen", "Xiaoming", "" ], [ "Yin", "Rui", "" ] ]
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1402.5486
Huazi Zhang
Huazi Zhang, Zhaoyang Zhang, Huaiyu Dai
Rateless-Coding-Assisted Multi-Packet Spreading over Mobile Networks
null
null
null
null
cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A novel Rateless-coding-assisted Multi-Packet Relaying (RMPR) protocol is proposed for large-size data spreading in mobile wireless networks. With this lightweight and robust protocol, the packet redundancy is reduced by a factor of $\sqrt n$, while the spreading time is reduced at least by a factor of $\ln (n)$. Closed-form bounds and explicit non-asymptotic results are presented, which are further validated through simulations. Besides, the packet duplication phenomenon in the network setting is analyzed for the first time.
[ { "created": "Sat, 22 Feb 2014 06:21:54 GMT", "version": "v1" } ]
2014-02-25
[ [ "Zhang", "Huazi", "" ], [ "Zhang", "Zhaoyang", "" ], [ "Dai", "Huaiyu", "" ] ]
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1402.5487
Jae Wan Shim
Jae Wan Shim
Parametric Lattice Boltzmann Method
26 pages, 11 figures, and 3 tables
J. Comp. Phys. 338 (2017) 240-251
10.1016/j.jcp.2017.02.057
null
physics.comp-ph physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The discretized equilibrium distributions of the lattice Boltzmann method are presented by using the coefficients of the Lagrange interpolating polynomials that pass through the points related to discrete velocities and using moments of the Maxwell-Boltzmann distribution. The ranges of flow velocity and temperature providing positive valued distributions vary with regulating discrete velocities as parameters. New isothermal and thermal compressible models are proposed for flows of the level of the isothermal and thermal compressible Navier-Stokes equations. Thermal compressible shock tube flows are simulated by only five on-lattice discrete velocities. Two-dimensional isothermal and thermal vortices provoked by the Kelvin-Helmholtz instability are simulated by the parametric models.
[ { "created": "Sat, 22 Feb 2014 06:40:17 GMT", "version": "v1" }, { "created": "Thu, 26 Mar 2015 19:08:32 GMT", "version": "v2" }, { "created": "Tue, 9 Jun 2015 00:50:30 GMT", "version": "v3" }, { "created": "Thu, 18 Aug 2016 19:10:17 GMT", "version": "v4" }, { "created": "Thu, 9 Mar 2017 19:32:35 GMT", "version": "v5" } ]
2020-11-10
[ [ "Shim", "Jae Wan", "" ] ]
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1402.5488
Huazi Zhang
Huazi Zhang, Zhaoyang Zhang, Huaiyu Dai, Rui Yin, Xiaoming Chen
Distributed Spectrum-Aware Clustering in Cognitive Radio Sensor Networks
null
null
null
null
cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A novel Distributed Spectrum-Aware Clustering (DSAC) scheme is proposed in the context of Cognitive Radio Sensor Networks (CRSN). DSAC aims at forming energy efficient clusters in a self-organized fashion while restricting interference to Primary User (PU) systems. The spectrum-aware clustered structure is presented where the communications consist of intra-cluster aggregation and inter-cluster relaying. In order to save communication power, the optimal number of clusters is derived and the idea of groupwise constrained clustering is introduced to minimize intra-cluster distance under spectrum-aware constraint. In terms of practical implementation, DSAC demonstrates preferable scalability and stability because of its low complexity and quick convergence under dynamic PU activity. Finally, simulation results are given to validate the proposed scheme.
[ { "created": "Sat, 22 Feb 2014 06:54:29 GMT", "version": "v1" } ]
2014-02-25
[ [ "Zhang", "Huazi", "" ], [ "Zhang", "Zhaoyang", "" ], [ "Dai", "Huaiyu", "" ], [ "Yin", "Rui", "" ], [ "Chen", "Xiaoming", "" ] ]
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1402.5492
\"Ozg\"ur \"Ozkan
Pooya Davoodi, Jeremy T. Fineman, John Iacono, \"Ozg\"ur \"Ozkan
Cache-Oblivious Persistence
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Partial persistence is a general transformation that takes a data structure and allows queries to be executed on any past state of the structure. The cache-oblivious model is the leading model of a modern multi-level memory hierarchy.We present the first general transformation for making cache-oblivious model data structures partially persistent.
[ { "created": "Sat, 22 Feb 2014 08:08:23 GMT", "version": "v1" }, { "created": "Tue, 1 Jul 2014 04:56:48 GMT", "version": "v2" } ]
2014-07-02
[ [ "Davoodi", "Pooya", "" ], [ "Fineman", "Jeremy T.", "" ], [ "Iacono", "John", "" ], [ "Özkan", "Özgür", "" ] ]
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1402.5495
Micha{\l} Stronkowski
Wojciech Dzik and Michal M. Stronkowski
Almost structural completeness; an algebraic approach
null
null
null
null
math.LO cs.LO math.RA
http://creativecommons.org/licenses/by-nc-sa/3.0/
A deductive system is structurally complete if its admissible inference rules are derivable. For several important systems, like modal logic S5, failure of structural completeness is caused only by the underivability of passive rules, i.e. rules that can not be applied to theorems of the system. Neglecting passive rules leads to the notion of almost structural completeness, that means, derivablity of admissible non-passive rules. Almost structural completeness for quasivarieties and varieties of general algebras is investigated here by purely algebraic means. The results apply to all algebraizable deductive systems. Firstly, various characterizations of almost structurally complete quasivarieties are presented. Two of them are general: expressed with finitely presented algebras, and with subdirectly irreducible algebras. One is restricted to quasivarieties with finite model property and equationally definable principal relative congruences, where the condition is verifiable on finite subdirectly irreducible algebras. Secondly, examples of almost structurally complete varieties are provided Particular emphasis is put on varieties of closure algebras, that are known to constitute adequate semantics for normal extensions of S4 modal logic. A certain infinite family of such almost structurally complete, but not structurally complete, varieties is constructed. Every variety from this family has a finitely presented unifiable algebra which does not embed into any free algebra for this variety. Hence unification in it is not unitary. This shows that almost structural completeness is strictly weaker than projective unification for varieties of closure algebras.
[ { "created": "Sat, 22 Feb 2014 08:42:03 GMT", "version": "v1" }, { "created": "Fri, 22 Aug 2014 20:51:18 GMT", "version": "v2" } ]
2014-08-26
[ [ "Dzik", "Wojciech", "" ], [ "Stronkowski", "Michal M.", "" ] ]
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1402.5497
Chunhua Shen
Yan Yan, Chunhua Shen, Hanzi Wang
Efficient Semidefinite Spectral Clustering via Lagrange Duality
13 pages
null
null
null
cs.LG cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose an efficient approach to semidefinite spectral clustering (SSC), which addresses the Frobenius normalization with the positive semidefinite (p.s.d.) constraint for spectral clustering. Compared with the original Frobenius norm approximation based algorithm, the proposed algorithm can more accurately find the closest doubly stochastic approximation to the affinity matrix by considering the p.s.d. constraint. In this paper, SSC is formulated as a semidefinite programming (SDP) problem. In order to solve the high computational complexity of SDP, we present a dual algorithm based on the Lagrange dual formalization. Two versions of the proposed algorithm are proffered: one with less memory usage and the other with faster convergence rate. The proposed algorithm has much lower time complexity than that of the standard interior-point based SDP solvers. Experimental results on both UCI data sets and real-world image data sets demonstrate that 1) compared with the state-of-the-art spectral clustering methods, the proposed algorithm achieves better clustering performance; and 2) our algorithm is much more efficient and can solve larger-scale SSC problems than those standard interior-point SDP solvers.
[ { "created": "Sat, 22 Feb 2014 09:39:52 GMT", "version": "v1" } ]
2014-02-25
[ [ "Yan", "Yan", "" ], [ "Shen", "Chunhua", "" ], [ "Wang", "Hanzi", "" ] ]
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1402.5498
H. D. Zeh
H. Dieter Zeh
John Bell's varying interpretations of quantum mechanics
17 pages - v2-v8: minor changes, comments and references added; v7: published
Quantum Nonlocality and Reality, Mary Bell and Gao Shan, edts., CUP 2016, pp. 331-343
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quant-ph gr-qc physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Various interpretations of quantum mechanics, favored (or neglected) by John Bell in the context of his non-locality theorem, are compared and discussed.
[ { "created": "Sat, 22 Feb 2014 10:17:06 GMT", "version": "v1" }, { "created": "Thu, 27 Mar 2014 09:57:45 GMT", "version": "v2" }, { "created": "Wed, 14 May 2014 10:05:08 GMT", "version": "v3" }, { "created": "Sun, 1 Jun 2014 14:44:32 GMT", "version": "v4" }, { "created": "Tue, 5 Aug 2014 09:14:14 GMT", "version": "v5" }, { "created": "Wed, 8 Oct 2014 15:38:34 GMT", "version": "v6" }, { "created": "Thu, 4 Dec 2014 10:36:29 GMT", "version": "v7" }, { "created": "Fri, 20 Jan 2017 10:18:17 GMT", "version": "v8" } ]
2017-01-23
[ [ "Zeh", "H. Dieter", "" ] ]
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1402.5500
J\'er\^ome Kunegis
J\'er\^ome Kunegis
Handbook of Network Analysis [KONECT -- the Koblenz Network Collection]
64 pages
null
null
null
cs.SI physics.soc-ph
http://creativecommons.org/licenses/by-sa/4.0/
This is the handbook for the KONECT project, the \emph{Koblenz Network Collection}, a scientific project to collect, analyse, and provide network datasets for researchers in all related fields of research, by the Namur Center for Complex Systems (naXys) at the University of Namur, Belgium, with web hosting provided by the Institute for Web Science and Technologies (WeST) at the University of Koblenz--Landau, Germany.
[ { "created": "Sat, 22 Feb 2014 11:31:04 GMT", "version": "v1" }, { "created": "Fri, 12 Sep 2014 12:33:42 GMT", "version": "v2" }, { "created": "Mon, 5 Sep 2016 18:09:42 GMT", "version": "v3" }, { "created": "Sat, 6 May 2017 13:21:52 GMT", "version": "v4" } ]
2017-05-09
[ [ "Kunegis", "Jérôme", "" ] ]
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Handbook of Network Analysis [KONECT -- the Koblenz Network Collection]
http://arxiv.org/abs/1402.5500v4
http://arxiv.org/pdf/1402.5500v4.pdf
https://github.com/kunegis/konect-handbook
true
true
https://paperswithcode.com/paper/handbook-of-network-analysis-konect-the
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1402.5503
Huazi Zhang
Huazi Zhang, Zhaoyang Zhang, Yuen Chau
Distributed Compressed Wideband Sensing in Cognitive Radio Sensor Networks
null
null
null
null
cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A novel distributed compressed wideband sensing scheme for Cognitive Radio Sensor Networks (CRSN) is proposed in this paper. Taking advantage of the distributive nature of CRSN, the proposed scheme deploys only one single narrowband sampler with ultra-low sampling rate at each nodes to accomplish the wideband spectrum sensing. First, the practical structure of the compressed sampler at each node is described in detail. Second, we show how the Fusion Center (FC) exploits the sampled signals with their spectrum randomly-aliased to detect the global wideband spectrum activity. Finally, the proposed scheme is validated through extensive simulations, which shows that it is particularly suitable for CRSN.
[ { "created": "Sat, 22 Feb 2014 11:58:39 GMT", "version": "v1" } ]
2014-02-25
[ [ "Zhang", "Huazi", "" ], [ "Zhang", "Zhaoyang", "" ], [ "Chau", "Yuen", "" ] ]
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1402.5508
Ryugo Hayano
Ryugo S. Hayano and Shunji Yamanaka and Frazier L. Bronson and Babatunde Oginni and Isamu Muramatsu
BABYSCAN - a whole body counter for small children in Fukushima
7 figures, 2 tables
null
10.1088/0952-4746/34/3/645
null
physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
BABYSCAN, a whole body counter for small children with a detection limit for $^{137}$Cs of better than 50 Bq/body, was developed, and the first unit has been installed at a hospital in Fukushima, to help families with small children who are very much concerned about internal exposures. The design principles, implementation details and the initial operating experience are described.
[ { "created": "Sat, 22 Feb 2014 12:58:41 GMT", "version": "v1" }, { "created": "Tue, 24 Jun 2014 13:36:47 GMT", "version": "v2" } ]
2015-01-15
[ [ "Hayano", "Ryugo S.", "" ], [ "Yamanaka", "Shunji", "" ], [ "Bronson", "Frazier L.", "" ], [ "Oginni", "Babatunde", "" ], [ "Muramatsu", "Isamu", "" ] ]
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1402.5511
Masoud Abbaszadeh
Masoud Abbaszadeh
A Generalized Robust Filtering Framework for Nonlinear Differential-Algebraic Systems
26 pages, 5 figures
null
null
null
cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A generalized dynamical robust nonlinear filtering framework is established for a class of Lipschitz differential algebraic systems, in which the nonlinearities appear both in the state and measured output equations. The system is assumed to be affected by norm-bounded disturbance and to have both norm-bounded uncertainties in the realization matrices as well as nonlinear model uncertainties. We synthesize a robust H_infty filter through semidefinite programming and strict linear matrix inequalities (LMIs). The admissible Lipschitz constants of the nonlinear functions are maximized through LMI optimization. The resulting H_infty filter guarantees asymptotic stability of the estimation error dynamics with prespecified disturbance attenuation level and is robust against time-varying parametric uncertainties as well as Lipschitz nonlinear additive uncertainty. Explicit bound on the tolerable nonlinear uncertainty is derived based on a norm-wise robustness analysis.
[ { "created": "Sat, 22 Feb 2014 13:21:24 GMT", "version": "v1" } ]
2014-02-25
[ [ "Abbaszadeh", "Masoud", "" ] ]
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1402.5515
Ya Cheng Professor
Jielei Ni, Wei Chu, Haisu Zhang, Bin Zeng, Jinping Yao, Guihua Li, Chenrui Jing, Hongqiang Xie, Huailiang Xu, Ya Cheng, and Zhizhan Xu
Impulsive rotational Raman scattering of N2 by a remote "air laser" in femtosecond laser filament
4 pages, 4 figures
null
10.1364/OL.39.002250
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on experimental realization of impulsive rotational Raman scattering from neutral nitrogen molecules in a femtosecond laser filament using an intense self-induced white-light seeding "air laser" generated during the filamentation of an 800 nm Ti: Sapphire laser in nitrogen gas. The impulsive rotational Raman fingerprint signals are observed with a maximum conversion efficiency of ~0.8%. Our observation provides a promising way of remote identification and location of chemical species in atmosphere by rotational Raman scattering of molecules.
[ { "created": "Sat, 22 Feb 2014 14:35:48 GMT", "version": "v1" } ]
2015-06-18
[ [ "Ni", "Jielei", "" ], [ "Chu", "Wei", "" ], [ "Zhang", "Haisu", "" ], [ "Zeng", "Bin", "" ], [ "Yao", "Jinping", "" ], [ "Li", "Guihua", "" ], [ "Jing", "Chenrui", "" ], [ "Xie", "Hongqiang", "" ], [ "Xu", "Huailiang", "" ], [ "Cheng", "Ya", "" ], [ "Xu", "Zhizhan", "" ] ]
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1402.5516
Peng Zhang
Peng Zhang, Wei Chen, Xiaoming Sun, Yajun Wang, Jialin Zhang
Minimizing Seed Set Selection with Probabilistic Coverage Guarantee in a Social Network
Conference version will appear in KDD 2014
null
null
null
cs.SI cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A topic propagating in a social network reaches its tipping point if the number of users discussing it in the network exceeds a critical threshold such that a wide cascade on the topic is likely to occur. In this paper, we consider the task of selecting initial seed users of a topic with minimum size so that with a guaranteed probability the number of users discussing the topic would reach a given threshold. We formulate the task as an optimization problem called seed minimization with probabilistic coverage guarantee (SM-PCG). This problem departs from the previous studies on social influence maximization or seed minimization because it considers influence coverage with probabilistic guarantees instead of guarantees on expected influence coverage. We show that the problem is not submodular, and thus is harder than previously studied problems based on submodular function optimization. We provide an approximation algorithm and show that it approximates the optimal solution with both a multiplicative ratio and an additive error. The multiplicative ratio is tight while the additive error would be small if influence coverage distributions of certain seed sets are well concentrated. For one-way bipartite graphs we analytically prove the concentration condition and obtain an approximation algorithm with an $O(\log n)$ multiplicative ratio and an $O(\sqrt{n})$ additive error, where $n$ is the total number of nodes in the social graph. Moreover, we empirically verify the concentration condition in real-world networks and experimentally demonstrate the effectiveness of our proposed algorithm comparing to commonly adopted benchmark algorithms.
[ { "created": "Sat, 22 Feb 2014 15:24:12 GMT", "version": "v1" }, { "created": "Wed, 18 Jun 2014 17:41:41 GMT", "version": "v2" } ]
2014-06-19
[ [ "Zhang", "Peng", "" ], [ "Chen", "Wei", "" ], [ "Sun", "Xiaoming", "" ], [ "Wang", "Yajun", "" ], [ "Zhang", "Jialin", "" ] ]
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1402.5521
Gesualdo Scutari
Francisco Facchinei and Gesualdo Scutari and Simone Sagratella
Parallel Selective Algorithms for Big Data Optimization
This work is an extended version of the conference paper that has been presented at IEEE ICASSP'14. The first and the second author contributed equally to the paper. This revised version contains new numerical results on non convex quadratic problems
null
10.1109/TSP.2015.2399858
null
cs.DC cs.IT cs.NA math.IT math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a decomposition framework for the parallel optimization of the sum of a differentiable (possibly nonconvex) function and a (block) separable nonsmooth, convex one. The latter term is usually employed to enforce structure in the solution, typically sparsity. Our framework is very flexible and includes both fully parallel Jacobi schemes and Gauss- Seidel (i.e., sequential) ones, as well as virtually all possibilities "in between" with only a subset of variables updated at each iteration. Our theoretical convergence results improve on existing ones, and numerical results on LASSO, logistic regression, and some nonconvex quadratic problems show that the new method consistently outperforms existing algorithms.
[ { "created": "Sat, 22 Feb 2014 16:01:50 GMT", "version": "v1" }, { "created": "Wed, 26 Feb 2014 14:04:41 GMT", "version": "v2" }, { "created": "Thu, 6 Mar 2014 13:41:01 GMT", "version": "v3" }, { "created": "Fri, 8 Aug 2014 23:26:02 GMT", "version": "v4" }, { "created": "Tue, 9 Dec 2014 00:44:39 GMT", "version": "v5" } ]
2015-06-18
[ [ "Facchinei", "Francisco", "" ], [ "Scutari", "Gesualdo", "" ], [ "Sagratella", "Simone", "" ] ]
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1402.5522
Oleg Markin
Oleg Markin and Evgueny Tarkovsky
Simulations of the COMET veto counter
Done for the COMET TDR
null
null
COMET-doc-90
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A computer model of a scintillator strip veto counter was built in order to verify the efficiency of the cosmic muon veto for the COMET experiment. To tune the model, experimentally measured data were utilized. Three different geometrical configuration of the counter were considered. For one of the configurations the simulation gave the inefficiency of the cosmic muon registration being below 0.0001, which meets requirements of the experiment.
[ { "created": "Sat, 22 Feb 2014 16:06:36 GMT", "version": "v1" } ]
2014-02-25
[ [ "Markin", "Oleg", "" ], [ "Tarkovsky", "Evgueny", "" ] ]
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1402.5524
Olga Ohrimenko
Olga Ohrimenko, Michael T. Goodrich, Roberto Tamassia, Eli Upfal
The Melbourne Shuffle: Improving Oblivious Storage in the Cloud
null
null
null
null
cs.CR cs.DC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a simple, efficient, and secure data-oblivious randomized shuffle algorithm. This is the first secure data-oblivious shuffle that is not based on sorting. Our method can be used to improve previous oblivious storage solutions for network-based outsourcing of data.
[ { "created": "Sat, 22 Feb 2014 16:29:22 GMT", "version": "v1" } ]
2014-02-25
[ [ "Ohrimenko", "Olga", "" ], [ "Goodrich", "Michael T.", "" ], [ "Tamassia", "Roberto", "" ], [ "Upfal", "Eli", "" ] ]
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1402.5525
Pierre-Henri Chavanis
Pierre-Henri Chavanis
A parametrization of two-dimensional turbulence based on a maximum entropy production principle with a local conservation of energy
To appear in the special IUTAM issue of Fluid Dynamics Research on Vortex Dynamics
Fluid Dyn. Res. 46, 061409 (2014)
10.1088/0169-5983/46/6/061409
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the context of two-dimensional (2D) turbulence, we apply the maximum entropy production principle (MEPP) by enforcing a local conservation of energy. This leads to an equation for the vorticity distribution that conserves all the Casimirs, the energy, and that increases monotonically the mixing entropy ($H$-theorem). Furthermore, the equation for the coarse-grained vorticity dissipates monotonically all the generalized enstrophies. These equations may provide a parametrization of 2D turbulence. They do not generally relax towards the maximum entropy state. The vorticity current vanishes for any steady state of the 2D Euler equation. Interestingly, the equation for the coarse-grained vorticity obtained from the MEPP turns out to coincide, after some algebraic manipulations, with the one obtained with the anticipated vorticity method. This shows a connection between these two approaches when the conservation of energy is treated locally. Furthermore, the newly derived equation, which incorporates a diffusion term and a drift term, has a nice physical interpretation in terms of a selective decay principle. This gives a new light to both the MEPP and the anticipated vorticity method.
[ { "created": "Sat, 22 Feb 2014 16:38:50 GMT", "version": "v1" }, { "created": "Mon, 30 Nov 2015 15:35:09 GMT", "version": "v2" } ]
2015-12-01
[ [ "Chavanis", "Pierre-Henri", "" ] ]
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1402.5530
Petr Zhokhov
P. A. Zhokhov and A. M. Zheltikov
Field-cycle-resolved photoionization in solids
4 pages, 2 figures
Physical Review Letters, vol. 113, p. 133903 (2014)
10.1103/PhysRevLett.113.133903
null
physics.optics cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Keldysh theory of photoionization in a solid dielectric is generalized to the case of arbitrarily short driving pulses of arbitrary pulse shape. We derive a closed-form solution for the nonadiabatic ionization rate in a transparent solid with a periodic dispersion relation, which reveals ultrafast ionization dynamics within the field cycle and recovers the key results of the Keldysh theory in the appropriate limiting regimes.
[ { "created": "Sat, 22 Feb 2014 17:21:36 GMT", "version": "v1" }, { "created": "Fri, 4 Jul 2014 16:07:34 GMT", "version": "v2" }, { "created": "Tue, 12 Aug 2014 22:29:15 GMT", "version": "v3" } ]
2014-11-11
[ [ "Zhokhov", "P. A.", "" ], [ "Zheltikov", "A. M.", "" ] ]
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1402.5540
Horacio Failache
L. Lenci, A. Auyuanet, S. Barreiro, P. Valente, A. Lezama, H. Failache
Vectorial atomic magnetometer based on coherent transients of laser absorption in Rb vapor
6 pages, 6 figures
null
10.1103/PhysRevA.89.043836
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have designed and tested an atomic vectorial magnetometer based on the analysis of the coherent oscillatory transients in the transmission of resonant laser light through a Rb vapor cell. We show that the oscillation amplitudes at the Larmor frequency and its first harmonic are related through a simple formula to the angles determining the orientation of the magnetic field vector. The magnetometer was successfully applied to the measurement of the ambient magnetic field.
[ { "created": "Sat, 22 Feb 2014 18:17:35 GMT", "version": "v1" } ]
2015-06-18
[ [ "Lenci", "L.", "" ], [ "Auyuanet", "A.", "" ], [ "Barreiro", "S.", "" ], [ "Valente", "P.", "" ], [ "Lezama", "A.", "" ], [ "Failache", "H.", "" ] ]
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1402.5557
Vito Veneziano Dr
Vito Veneziano, Austen W. Rainer, Sheraz Haider
When Agile Is Not Good Enough: an initial attempt at understanding how to make the right decision
null
null
null
null
cs.SE cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Particularly over the last ten years, Agile has attracted not only the praises of a broad range of enthusiast software developers, but also the criticism of others. Either way, adoption or rejection of Agile seems sometimes to be based more on a questionable understanding than on a critical, well-informed decision making process. In this paper, the dual nature of the above criticism is discussed, and the arguments against Agile have been classified within a critical taxonomy of risk factors. A decisional model and tool based on such taxonomy are consequently proposed for supporting software engineers and other stakeholders in the decision-making about whether or not to use Agile. The tool, which is freely available online, comes with a set of guidelines: its purpose is to facilitate the community of software developers to contribute to further assessing the potential and the criticalities of Agile Methods.
[ { "created": "Sat, 22 Feb 2014 22:16:35 GMT", "version": "v1" }, { "created": "Wed, 2 Jul 2014 16:31:57 GMT", "version": "v2" } ]
2014-07-03
[ [ "Veneziano", "Vito", "" ], [ "Rainer", "Austen W.", "" ], [ "Haider", "Sheraz", "" ] ]
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1402.5562
Francesca Baletto Dr
J. M. Finn, F. Baletto
Finite temperature dynamics of anionic water trimers
8 pages; 4 figures; 49 references
null
null
null
physics.atm-clus physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Utilising Car-Parrinello molecular dynamics simulations, the finite temperature behaviour of water trimers, (H2O)3, in both neutral and anionic frameworks, has been investigated. A significant structural change in the anionic structure has been observed at temperatures above 100 K where a chain geometry has formed and stabilised entropically. On the other hand, neutral trimers have remained in their ring structure, as predicted theoretically at low temperatures, for long time periods.
[ { "created": "Sat, 22 Feb 2014 22:40:59 GMT", "version": "v1" } ]
2014-02-25
[ [ "Finn", "J. M.", "" ], [ "Baletto", "F.", "" ] ]
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1402.5564
Ahmadreza Baghaie
Ahmadreza Baghaie and Zeyun Yu
Structure Tensor Based Image Interpolation Method
Accepted for publication in AEU - International Journal of Electronics and Communications
null
10.1016/j.aeue.2014.10.022
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Feature preserving image interpolation is an active area in image processing field. In this paper a new direct edge directed image super-resolution algorithm based on structure tensors is proposed. Using an isotropic Gaussian filter, the structure tensor at each pixel of the input image is computed and the pixels are classified to three distinct classes; uniform region, corners and edges, according to the eigenvalues of the structure tensor. Due to application of the isotropic Gaussian filter, the classification is robust to noise presented in image. Based on the tangent eigenvector of the structure tensor, the edge direction is determined and used for interpolation along the edges. In comparison to some previous edge directed image interpolation methods, the proposed method achieves higher quality in both subjective and objective aspects. Also the proposed method outperforms previous methods in case of noisy and JPEG compressed images. Furthermore, without the need for optimization in the process, the algorithm can achieve higher speed.
[ { "created": "Sat, 22 Feb 2014 23:58:11 GMT", "version": "v1" }, { "created": "Mon, 26 May 2014 03:20:08 GMT", "version": "v2" }, { "created": "Fri, 26 Dec 2014 08:18:31 GMT", "version": "v3" } ]
2014-12-30
[ [ "Baghaie", "Ahmadreza", "" ], [ "Yu", "Zeyun", "" ] ]
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1402.5565
David M. Johnson
David M. Johnson, Caiming Xiong and Jason J. Corso
Semi-Supervised Nonlinear Distance Metric Learning via Forests of Max-Margin Cluster Hierarchies
Manuscript submitted to SIGKDD on 21 Feb 2014
null
null
null
stat.ML cs.IR cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Metric learning is a key problem for many data mining and machine learning applications, and has long been dominated by Mahalanobis methods. Recent advances in nonlinear metric learning have demonstrated the potential power of non-Mahalanobis distance functions, particularly tree-based functions. We propose a novel nonlinear metric learning method that uses an iterative, hierarchical variant of semi-supervised max-margin clustering to construct a forest of cluster hierarchies, where each individual hierarchy can be interpreted as a weak metric over the data. By introducing randomness during hierarchy training and combining the output of many of the resulting semi-random weak hierarchy metrics, we can obtain a powerful and robust nonlinear metric model. This method has two primary contributions: first, it is semi-supervised, incorporating information from both constrained and unconstrained points. Second, we take a relaxed approach to constraint satisfaction, allowing the method to satisfy different subsets of the constraints at different levels of the hierarchy rather than attempting to simultaneously satisfy all of them. This leads to a more robust learning algorithm. We compare our method to a number of state-of-the-art benchmarks on $k$-nearest neighbor classification, large-scale image retrieval and semi-supervised clustering problems, and find that our algorithm yields results comparable or superior to the state-of-the-art, and is significantly more robust to noise.
[ { "created": "Sun, 23 Feb 2014 00:26:48 GMT", "version": "v1" } ]
2014-02-25
[ [ "Johnson", "David M.", "" ], [ "Xiong", "Caiming", "" ], [ "Corso", "Jason J.", "" ] ]
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1402.5572
Yongqiang Wang Dr
Yongqiang Wang and Yutaka Hori and Shinji Hara and Francis J. Doyle III
Collective oscillation period of inter-coupled biological negative cyclic feedback oscillators
arXiv admin note: substantial text overlap with arXiv:1203.1251
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A number of biological rhythms originate from networks comprised of multiple cellular oscillators. But analytical results are still lacking on the collective oscillation period of inter-coupled gene regulatory oscillators, which, as has been reported, may be different from that of an autonomous oscillator. Based on cyclic feedback oscillators, we analyze the collective oscillation pattern of coupled cellular oscillators. First we give a condition under which the oscillator network exhibits oscillatory and synchronized behavior. Then we estimate the collective oscillation period based on a novel multivariable harmonic balance technique. Analytical results are derived in terms of biochemical parameters, thus giving insight into the basic mechanism of biological oscillation and providing guidance in synthetic biology design.
[ { "created": "Sun, 23 Feb 2014 02:44:52 GMT", "version": "v1" }, { "created": "Tue, 25 Feb 2014 19:32:40 GMT", "version": "v2" } ]
2014-02-26
[ [ "Wang", "Yongqiang", "" ], [ "Hori", "Yutaka", "" ], [ "Hara", "Shinji", "" ], [ "Doyle", "Francis J.", "III" ] ]
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1402.5575
Yoshiyuki Kuramoto
Yoshiyuki Kuramoto and Hiroshi Okuda
High-accuracy absolute distance measurement by two-wavelength double heterodyne interferometry with variable synthetic wavelengths
7 pages
null
null
null
physics.ins-det physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an absolute distance measurement interferometer based on a two wavelength interferometer and a variable synthetic wavelength technique. The wavelength scanning range was 12 GHz, realized with a phase accuracy of 1.0 m{\lambda} by heterodyne detection at each measurement wavelength. This small wavelength scanning range enabled the use of distributed feedback laser diodes as an interferometer light source and a fast 20 ms wavelength scanning time by injection current control. We demonstrated a measurement range of up to 1.5 m and an accuracy better than 1.2 nm in comparison with a displacement measurement interferometer, corresponding to a relative accuracy of 10-9. In addition, we also proposed expanding the range of maximum measurement and compensation of refractive index of air for linear colliders.
[ { "created": "Sun, 23 Feb 2014 04:12:42 GMT", "version": "v1" } ]
2014-02-25
[ [ "Kuramoto", "Yoshiyuki", "" ], [ "Okuda", "Hiroshi", "" ] ]
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1402.5576
Jie Ren
Nianbei Li, Jie Ren
Non-Reciprocal Geometric Wave Diode by Engineering Asymmetric Shapes of Nonlinear Materials
4 figures
Scientific Reports 4, 6228 (2014)
10.1038/srep06228
null
cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Unidirectional nonreciprocal transport is at the heart of many fundamental problems and applications in both science and technology. Here we study the novel design of wave diode devices by engineering asymmetric shapes of nonlinear materials to realize the function of non-reciprocal wave propagations. We first show analytical results revealing that both nonlinearity and asymmetry are necessary to induce such non-reciprocal (asymmetric) wave propagations. Detailed numerical simulations are further performed for a more realistic geometric wave diode model with typical asymmetric shape, where good non-reciprocal wave diode effect is demonstrated. Finally, we discuss the scalability of geometric wave diodes. The results open a flexible way for designing wave diodes efficiently simply through shape engineering of nonlinear materials, which may find broad implications in controlling energy, mass and information transports.
[ { "created": "Sun, 23 Feb 2014 04:12:53 GMT", "version": "v1" } ]
2015-09-10
[ [ "Li", "Nianbei", "" ], [ "Ren", "Jie", "" ] ]
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1402.5584
Divyanshu Vats
Divyanshu Vats, Richard G. Baraniuk
Path Thresholding: Asymptotically Tuning-Free High-Dimensional Sparse Regression
AISTATS 2014
Proceedings of the 17th International Conference on Artificial Intelligence and Statistics (AISTATS) 2014, Reykjavik, Iceland. JMLR: W&CP volume 33
null
null
math.ST cs.IT math.IT stat.ML stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we address the challenging problem of selecting tuning parameters for high-dimensional sparse regression. We propose a simple and computationally efficient method, called path thresholding (PaTh), that transforms any tuning parameter-dependent sparse regression algorithm into an asymptotically tuning-free sparse regression algorithm. More specifically, we prove that, as the problem size becomes large (in the number of variables and in the number of observations), PaTh performs accurate sparse regression, under appropriate conditions, without specifying a tuning parameter. In finite-dimensional settings, we demonstrate that PaTh can alleviate the computational burden of model selection algorithms by significantly reducing the search space of tuning parameters.
[ { "created": "Sun, 23 Feb 2014 07:23:39 GMT", "version": "v1" } ]
2014-02-25
[ [ "Vats", "Divyanshu", "" ], [ "Baraniuk", "Richard G.", "" ] ]
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1402.5586
Shuanfeng Xu
Shuanfeng Xu, Hanlei Wang, Duzhou Zhang, and Baohua Yang
Adaptive Zero Reaction Motion Control for Free-Floating Space Manipulators
17 pages, 9 figures, revised for more rigorously presenting the proof and for improving the presentation, highlighting the contribution, and correcting some typos based on the reviewers' and AE's comments from IEEE Transactions on Aerospace and Electronic Systems
null
10.1109/TAES.2016.130715.
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper investigates adaptive zero reaction motion control for free-floating space manipulators with uncertain kinematics and dynamics. The challenge in deriving the adaptive reaction null-space (RNS) based control scheme is that it is difficult to obtain a linear expression, which is the basis of the adaptive control. The main contribution of this paper is that we skillfully obtain such a linear expression, based on which, an adaptive version of the RNS-based controller (referred to as the adaptive zero reaction motion controller in the sequel) is developed at the velocity level, taking into account both the kinematic and dynamic uncertainties. It is shown that the proposed controller achieves both the spacecraft attitude regulation and end-effector trajectory tracking. The performance of the proposed adaptive controller is shown by numerical simulations with a planar 3-DOF (degree-of-freedom) space manipulator.
[ { "created": "Sun, 23 Feb 2014 07:48:31 GMT", "version": "v1" }, { "created": "Mon, 14 Dec 2015 16:04:07 GMT", "version": "v2" } ]
2016-11-15
[ [ "Xu", "Shuanfeng", "" ], [ "Wang", "Hanlei", "" ], [ "Zhang", "Duzhou", "" ], [ "Yang", "Baohua", "" ] ]
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1402.5592
Shamim Ripon
Shamim Ripon, Mohammad Salah Uddin and Aoyan Barua
Web Service Composition - BPEL vs cCSP Process Algebra
6 pages, 4 figures, Advanced Computer Science Applications and Technologies (ACSAT), 2012 International Conference on
null
10.1109/ACSAT.2012.47
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Web services technology provides a platform on which we can develop distributed services. The interoperability among these services is achieved by various standard protocols. In recent years, several researches suggested that process algebras provide a satisfactory assistance to the whole process of web services development. Business transactions, on the other hand, involve the coordination and interaction between multiple partners. With the emergence of web services, business transactions are conducted using these services. The coordination among the business processes is crucial, so is the handling of faults that can arise at any stage of a transaction. BPEL models the behavior of business process interaction by providing a XML based grammar to describe the control logic required to coordinate the web services participating in a process flow. However BPEL lacks a proper formal description where the composition of business processes cannot be formally verified. Process algebra, on the other hand, facilitates a formal foundation for rigorous verification of the composition. This paper presents a comparison of web service composition between BPEL and process algebra, cCSP.
[ { "created": "Sun, 23 Feb 2014 09:55:51 GMT", "version": "v1" } ]
2014-02-25
[ [ "Ripon", "Shamim", "" ], [ "Uddin", "Mohammad Salah", "" ], [ "Barua", "Aoyan", "" ] ]
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1402.5593
Rustam Tagiew
Rustam Tagiew and Dmitry I. Ignatov
Reciprocity in Gift-Exchange-Games
6 pages, 2 figures, 5 tables
null
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents an analysis of data from a gift-exchange-game experiment. The experiment was described in `The Impact of Social Comparisons on Reciprocity' by G\"achter et al. 2012. Since this paper uses state-of-art data science techniques, the results provide a different point of view on the problem. As already shown in relevant literature from experimental economics, human decisions deviate from rational payoff maximization. The average gift rate was $31$%. Gift rate was under no conditions zero. Further, we derive some special findings and calculate their significance.
[ { "created": "Sun, 23 Feb 2014 10:07:59 GMT", "version": "v1" } ]
2014-02-25
[ [ "Tagiew", "Rustam", "" ], [ "Ignatov", "Dmitry I.", "" ] ]
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1402.5595
Shamim Ripon
Shamim Ripon, Sk. Jahir Hossain, Keya Azad and Mehidee Hassan
Logic Verification of Product-Line Variant Requirements
4 pages, 4 figures, Sofware Engineering and Applied Computing (ACSEAC), 2012 African Conference on
null
10.1109/ACSEAC.2012.14
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Formal verification of variant requirements has gained much interest in the software product line (SPL) community. Feature diagrams are widely used to model product line variants. However, there is a lack of precisely defined formal notation for representing and verifying such models. This paper presents an approach to modeling and verifying SPL variant feature diagrams using first-order logic. It provides a precise and rigorous formal interpretation of the feature diagrams. Logical expressions can be built by modeling variants and their dependencies by using propositional connectives. These expressions can then be validated by any suitable verification tool. A case study of a Computer Aided Dispatch (CAD) system variant feature model is presented to illustrate the verification process.
[ { "created": "Sun, 23 Feb 2014 10:17:53 GMT", "version": "v1" } ]
2014-02-25
[ [ "Ripon", "Shamim", "" ], [ "Hossain", "Sk. Jahir", "" ], [ "Azad", "Keya", "" ], [ "Hassan", "Mehidee", "" ] ]
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1402.5596
Jason Lee
Jason D Lee and Jonathan E Taylor
Exact Post Model Selection Inference for Marginal Screening
null
null
null
null
stat.ME cs.LG math.ST stat.ML stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a framework for post model selection inference, via marginal screening, in linear regression. At the core of this framework is a result that characterizes the exact distribution of linear functions of the response $y$, conditional on the model being selected (``condition on selection" framework). This allows us to construct valid confidence intervals and hypothesis tests for regression coefficients that account for the selection procedure. In contrast to recent work in high-dimensional statistics, our results are exact (non-asymptotic) and require no eigenvalue-like assumptions on the design matrix $X$. Furthermore, the computational cost of marginal regression, constructing confidence intervals and hypothesis testing is negligible compared to the cost of linear regression, thus making our methods particularly suitable for extremely large datasets. Although we focus on marginal screening to illustrate the applicability of the condition on selection framework, this framework is much more broadly applicable. We show how to apply the proposed framework to several other selection procedures including orthogonal matching pursuit, non-negative least squares, and marginal screening+Lasso.
[ { "created": "Sun, 23 Feb 2014 10:30:21 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 00:28:21 GMT", "version": "v2" } ]
2014-03-03
[ [ "Lee", "Jason D", "" ], [ "Taylor", "Jonathan E", "" ] ]
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1402.5599
Yu Lu
Zhaoguang Peng, Yu Lu, Alice Miller, Tingdi Zhao, Chris Johnson
Formal Specification and Quantitative Analysis of a Constellation of Navigation Satellites
null
null
10.1002/qre.1754
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Navigation satellites are a core component of navigation satellite based systems such as GPS, GLONASS and Galileo which provide location and timing information for a variety of uses. Such satellites are designed for operating on orbit to perform tasks and have lifetimes of 10 years or more. Reliability, availability and maintainability (RAM) analysis of systems has been indispensable in the design phase of satellites in order to achieve minimum failures or to increase mean time between failures (MTBF) and thus to plan maintenance strategies, optimise reliability and maximise availability. In this paper, we present formal models of both a single satellite and a navigation satellite constellation and logical specification of their reliability, availability and maintainability properties respectively. The probabilistic model checker PRISM has been used to perform automated analysis of these quantitative properties.
[ { "created": "Sun, 23 Feb 2014 12:12:40 GMT", "version": "v1" }, { "created": "Fri, 25 Apr 2014 22:27:12 GMT", "version": "v2" }, { "created": "Sun, 4 May 2014 17:26:45 GMT", "version": "v3" }, { "created": "Sat, 4 Oct 2014 20:44:02 GMT", "version": "v4" }, { "created": "Wed, 22 Oct 2014 20:08:52 GMT", "version": "v5" } ]
2014-10-24
[ [ "Peng", "Zhaoguang", "" ], [ "Lu", "Yu", "" ], [ "Miller", "Alice", "" ], [ "Zhao", "Tingdi", "" ], [ "Johnson", "Chris", "" ] ]
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1402.5602
Edward Bormashenko
Ed. Bormashenko, A. Musin, R. Grynuov
Scaling laws governing the roughness of the swash edge line
8 pages, 4 figures
null
null
null
physics.chem-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The physics of swash i.e. a layer of water that washes up on the beach after an incoming wave has broken is complicated and intriguing. It includes perplexed hydrodynamic and sediment transport events. In our paper we address to the roughness of the moving swash boundary at which a beach, water and air meet. We treat the behavior of this boundary as an interfacial phenomenon, without going into details of formation of edge waves and beach cusps, covered broadly in literature. This "crude" approach turns out to be productive and revealing the resemblance of the swash line with a broad diversity of effects arising from the random pinning of moving boundaries.
[ { "created": "Sun, 23 Feb 2014 12:27:45 GMT", "version": "v1" } ]
2014-02-25
[ [ "Bormashenko", "Ed.", "" ], [ "Musin", "A.", "" ], [ "Grynuov", "R.", "" ] ]
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1402.5604
Yan Han
Han Yan and Mingzhe Hou
Three-Dimensional Integrated Guidance and Control Based on Small-Gain Theorem
20 pages, 2 figures
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A three-dimensional (3D) integrated guidance and control (IGC) design approach is proposed by using small-gain theorem in this paper. The 3D IGC model is formulated by combining nonlinear pursuer dynamics with the nonlinear dynamics describing pursuitevasion motion. Small-gain theorem and ISS theory are iteratively utilized to design desired attack angle, sideslip angle and attitude angular rates (virtual controls), and eventually an IGC law is proposed. Theoretical analysis shows that the IGC approach can make the LOS rate converge into a small neighborhood of zero, and the stability of the overall system can be guaranteed as well.
[ { "created": "Sun, 23 Feb 2014 13:08:59 GMT", "version": "v1" } ]
2014-02-25
[ [ "Yan", "Han", "" ], [ "Hou", "Mingzhe", "" ] ]
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1402.5613
Peng Bo
Bo Peng, Zhipeng Lu, T.C.E. Cheng
A Tabu Search/Path Relinking Algorithm to Solve the Job Shop Scheduling Problem
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an algorithm that incorporates a tabu search procedure into the framework of path relinking to tackle the job shop scheduling problem (JSP). This tabu search/path relinking (TS/PR) algorithm comprises several distinguishing features, such as a specific relinking procedure and a reference solution determination method. To test the performance of TS/PR, we apply it to tackle almost all of the benchmark JSP instances available in the literature. The test results show that TS/PR obtains competitive results compared with state-of-the-art algorithms for JSP in the literature, demonstrating its efficacy in terms of both solution quality and computational efficiency. In particular, TS/PR is able to improve the upper bounds for 49 out of the 205 tested instances and it solves a challenging instance that has remained unsolved for over 20 years.
[ { "created": "Sun, 23 Feb 2014 14:46:04 GMT", "version": "v1" } ]
2014-02-25
[ [ "Peng", "Bo", "" ], [ "Lu", "Zhipeng", "" ], [ "Cheng", "T. C. E.", "" ] ]
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A Tabu Search/Path Relinking Algorithm to Solve the Job Shop Scheduling Problem
https://arxiv.org/abs/1402.5613v1
https://arxiv.org/pdf/1402.5613v1.pdf
https://github.com/thomasWeise/jsspInstancesAndResults
false
false
https://paperswithcode.com/paper/a-tabu-searchpath-relinking-algorithm-to
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1402.5617
V Karthikeyan VKK
V.Karthikeyan V. J. Vijayalakshmi
Control Loop Feedback Mechanism for Generic Array Logic Chip Multiprocessor
4 pages and 8 figures
null
null
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Control Loop Feedback Mechanism for Generic Array Logic Chip Multiprocessor is presented. The approach is based on control-loop feedback mechanism to maximize the efficiency on exploiting available resources such as CPU time, operating frequency, etc. Each Processing Element (PE) in the architecture is equipped with a frequency scaling module responsible for tuning the frequency of processors at run-time according to the application requirements. We show that generic array logic Chip Multiprocessors with large inter-processor First In First Outputs (First In First Outs) buffers can inherently hide much of the Generic Array Logic performance penalty while executing applications that have been mapped with few communication loops. In fact, the penalty can be driven to zero with sufficiently large First In First Outs and the removal of multiple-loop communication links. We present an example mesh-connected Generic Array Logic chip multiprocessor and show it has a less than 1% performance (throughput) reduction on average compared to the corresponding synchronous system for many DSP workloads. Furthermore, adaptive clock and voltage scaling for each processor provides an approximately 40% power savings without any performance reduction.
[ { "created": "Sun, 23 Feb 2014 15:17:09 GMT", "version": "v1" } ]
2014-02-25
[ [ "Vijayalakshmi", "V. Karthikeyan V. J.", "" ] ]
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1402.5619
V Karthikeyan VKK
V. Karthikeyan
A Novel Histogram Based Robust Image Registration Technique
5 pages and 6 figures. submit/0850305
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, a method for Automatic Image Registration (AIR) through histogram is proposed. Automatic image registration is one of the crucial steps in the analysis of remotely sensed data. A new acquired image must be transformed, using image registration techniques, to match the orientation and scale of previous related images. This new approach combines several segmentations of the pair of images to be registered. A relaxation parameter on the histogram modes delineation is introduced. It is followed by characterization of the extracted objects through the objects area, axis ratio, and perimeter and fractal dimension. The matched objects are used for rotation and translation estimation. It allows for the registration of pairs of images with differences in rotation and translation. This method contributes to subpixel accuracy.
[ { "created": "Sun, 23 Feb 2014 15:24:27 GMT", "version": "v1" } ]
2014-02-25
[ [ "Karthikeyan", "V.", "" ] ]
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1402.5620
Olga Smirnova
Lisa Torlina, Felipe Morales, Jivesh Kaushal, Harm Geert Muller, Igor Ivanov, Anatoli Kheifets, Alejandro Zielinski, Armin Scrinzi, Suren Sukiasyan, Misha Ivanov and Olga Smirnova
Interpreting Attoclock Measurements of Tunnelling Times
33 pages, 10 figures, 3 appendixes
null
null
null
physics.atom-ph physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Resolving in time the dynamics of light absorption by atoms and molecules, and the electronic rearrangement this induces, is among the most challenging goals of attosecond spectroscopy. The attoclock is an elegant approach to this problem, which encodes ionization times in the strong-field regime. However, the accurate reconstruction of these times from experimental data presents a formidable theoretical challenge. Here, we solve this problem by combining analytical theory with ab-initio numerical simulations. We apply our theory to numerical attoclock experiments on the hydrogen atom to extract ionization time delays and analyse their nature. Strong field ionization is often viewed as optical tunnelling through the barrier created by the field and the core potential. We show that, in the hydrogen atom, optical tunnelling is instantaneous. By calibrating the attoclock using the hydrogen atom, our method opens the way to identify possible delays associated with multielectron dynamics during strong-field ionization.
[ { "created": "Sun, 23 Feb 2014 15:42:32 GMT", "version": "v1" }, { "created": "Fri, 27 Feb 2015 11:45:14 GMT", "version": "v2" } ]
2015-03-02
[ [ "Torlina", "Lisa", "" ], [ "Morales", "Felipe", "" ], [ "Kaushal", "Jivesh", "" ], [ "Muller", "Harm Geert", "" ], [ "Ivanov", "Igor", "" ], [ "Kheifets", "Anatoli", "" ], [ "Zielinski", "Alejandro", "" ], [ "Scrinzi", "Armin", "" ], [ "Sukiasyan", "Suren", "" ], [ "Ivanov", "Misha", "" ], [ "Smirnova", "Olga", "" ] ]
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1402.5623
V Karthikeyan VKK
V.Karthikeyan and V.J.Vijayalakshmi
Localization of License Plate Using Morphological Operations
6 PAGES 12 FIGURES
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null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is believed that there are currently millions of vehicles on the roads worldwide. The over speed of vehicles,theft of vehicles, disobeying traffic rules in public, an unauthorized person entering the restricted area are keep on increasing. In order restrict against these criminal activities, we need an automatic public security system. Each vehicle has their own Vehicle Identification Number (VIN) as their primary identifier. The VIN is actually a License Number which states a legal license to participate in the public traffic. The proposed paper is to identify the vehicle with the help of vehicles License Plate (LP).LPRS is one the most important part of the Intelligent Transportation System (ITS) to locate the LP. In this paper certain existing algorithm drawbacks are overcome by the proposed morphological operations for LPRS. Morphological operation is chosen due to its higher efficiency, noise filter capacity, accuracy, exact localization of LP and speed.
[ { "created": "Sun, 23 Feb 2014 16:08:09 GMT", "version": "v1" } ]
2014-02-25
[ [ "Karthikeyan", "V.", "" ], [ "Vijayalakshmi", "V. J.", "" ] ]
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1402.5631
Jiutao Wu
B. Ning, S. Y. Zhang, D. Hou, J. T. Wu, Z. B. Li, and J. Y. Zhao
High-precision Distribution of Highly-stable Optical Pulse Trains with Sub-10-fs Timing Jitter
24 pages, 4 figures
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
High-precision optical pulse trains distribution via fibre links has made huge impacts in many fields. In most published works, the accuracies are still fundamentally limited by some unavoidable noises, such as thermal and shot noise from conventional photodiodes, thermal noise from mixers. Here, we demonstrate a new high-precision timing distribution system by using highly-precision phase detector to overcome the limitations. Instead of using photodiodes and microwave mixers, we use several fibre Sagnac-loop-based optical-microwave phase detectors to realize optical-electrical conversion and phase measurements, for suppressing the noises and achieving ultra-high accuracy. A 10-km fibre link distribution experiment shows our system provides a residual instability at the level of 4.6*10-15@1-s and 6.1*10-18@10000-s, with an integrated timing jitter as low as 3.8 fs in a bandwidth of 1 Hz to 100 KHz. This low instability and timing jitter makes it possible that our system can be used in the optical clock distribution or the applications for the facilities which require extremely accuracy frequency time synchronization.
[ { "created": "Sun, 23 Feb 2014 16:33:38 GMT", "version": "v1" } ]
2014-02-25
[ [ "Ning", "B.", "" ], [ "Zhang", "S. Y.", "" ], [ "Hou", "D.", "" ], [ "Wu", "J. T.", "" ], [ "Li", "Z. B.", "" ], [ "Zhao", "J. Y.", "" ] ]
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1402.5634
Gaurav Pandey
Gaurav Pandey and Ambedkar Dukkipati
To go deep or wide in learning?
9 pages, 1 figure, Accepted for publication in Seventeenth International Conference on Artificial Intelligence and Statistics
null
null
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
To achieve acceptable performance for AI tasks, one can either use sophisticated feature extraction methods as the first layer in a two-layered supervised learning model, or learn the features directly using a deep (multi-layered) model. While the first approach is very problem-specific, the second approach has computational overheads in learning multiple layers and fine-tuning of the model. In this paper, we propose an approach called wide learning based on arc-cosine kernels, that learns a single layer of infinite width. We propose exact and inexact learning strategies for wide learning and show that wide learning with single layer outperforms single layer as well as deep architectures of finite width for some benchmark datasets.
[ { "created": "Sun, 23 Feb 2014 16:51:51 GMT", "version": "v1" } ]
2014-02-25
[ [ "Pandey", "Gaurav", "" ], [ "Dukkipati", "Ambedkar", "" ] ]
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1402.5637
Pascal Marquet
Pascal Marquet
On the concept of pseudo-energy of T. G. Shepherd. A close link with exergy functions
An annotated, corrected and augmented copy of a Note submitted in January 1994 to the Quarterly Journal of the Royal Meteorological Society. Published in Volume 121, Issue 522, pages 455--459, January 1995 Part B. http://onlinelibrary.wiley.com/doi/10.1002/qj.49712152212/abstract (9 pages, 1 Figure)
null
10.1002/qj.49712152212
null
physics.ao-ph physics.flu-dyn physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Shepherd (1993) derived a general expression for the available potential energy for compressible, hydrostatic flow, where the sum of this available energy and the kinetic energy is called pseudo-energy. He demonstrated that for a special basic state the small-amplitude limit of the generalized available potential energy reduces to the well-known approximate form of Lorenz (1955) expressed in a pressure vertical coordinate. Other forms of available energies exist in atmospheric energetics and in thermodynamics, where the name exergy has been coined by Rant (1956) to denote the maximum work that can be extracted from any system when it is subject to some constraints (adiabatic transformations or constant total energy for instance). The purpose of this note is to show that the specific available enthalpy function denoted by $a_h = (h - h_r) - T_r \: (s - s_r)$ in Marquet (1991) can be obtained from the generalized approach of Shepherd for another basic state. This special form of pseudo-energy also leads to the global hydrostatic concepts of Dutton (1973) and Pichler (1977). The function $a_h$ only depends on the specific enthalpy $h$ and entropy $s$ at any point, the values $h_r$ and $s_r$ refer to the special dead state at temperature $T_r$ and pressure $p_r$. It is explained that for another choice of the basic state, the generalized expression of Shepherd reduces with a good accuracy to the approximate functions introduced by Pearce (1978) or Blackburn (1983) in meteorology and Thomson (1853, Lord Kelvin) in thermodynamics.
[ { "created": "Sun, 23 Feb 2014 17:07:52 GMT", "version": "v1" } ]
2014-02-26
[ [ "Marquet", "Pascal", "" ] ]
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1402.5639
Zhen Kan
Zhen Kan, Justin Klotz, Eduardo L. Pasiliao Jr, John M. Shea, Warren E. Dixon
Decentralized Rendezvous of Nonholonomic Robots with Sensing and Connectivity Constraints
9 pages, 5 figures, submitted to Automatica
null
null
null
cs.SY cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A group of wheeled robots with nonholonomic constraints is considered to rendezvous at a common specified setpoint with a desired orientation while maintaining network connectivity and ensuring collision avoidance within the robots. Given communication and sensing constraints for each robot, only a subset of the robots are aware or informed of the global destination, and the remaining robots must move within the network connectivity constraint so that the informed robots can guide the group to the goal. The mobile robots are also required to avoid collisions with each other outside a neighborhood of the common rendezvous point. To achieve the rendezvous control objective, decentralized time-varying controllers are developed based on a navigation function framework to steer the robots to perform rendezvous while preserving network connectivity and ensuring collision avoidance. Only local sensing feedback, which includes position feedback from immediate neighbors and absolute orientation measurement, is used to navigate the robots and enables radio silence during navigation. Simulation results demonstrate the performance of the developed approach.
[ { "created": "Sun, 23 Feb 2014 17:24:48 GMT", "version": "v1" } ]
2014-02-25
[ [ "Kan", "Zhen", "" ], [ "Klotz", "Justin", "" ], [ "Pasiliao", "Eduardo L.", "Jr" ], [ "Shea", "John M.", "" ], [ "Dixon", "Warren E.", "" ] ]
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1402.5642
Ankur Sahai
Ankur Sahai
VM Power Prediction in Distributed Systems for Maximizing Renewable Energy Usage
null
null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the context of GreenPAD project it is important to predict the energy consumption of individual (and mixture of) VMs / workload for optimal scheduling (running those VMs which require higher energy when there is more green energy available and vice-versa) in order to maximize green energy utilization. For this we execute the following experiments on an Openstack cloud testbed consisting of Fujitsu servers: VM energy measurement for different configurations (flavor + workload) and VM energy prediction for a new configuration. The automation framework for running these experiments uses bash scripts which call tools like 'stress' (simulating workloads), 'collected' (resource usage) and 'IPMI' (power measurement). We propose a linear model for predicting the power usage of the VMs based on regression. We first collect the resource usage (using collected) and the associated power usage (using IPMI) for different VM configurations and use this to build a (multi-) regression model (between resource usage and VM energy consumption). Then we use the information about the resource usage patterns of the new workload to predict the power usage. For predicting power for mix of workloads we execute (build a regression model based on) experiments with random workloads. We observe the highest energy usage for CPU-intensive workloads followed by memory-intensive workloads.
[ { "created": "Sun, 23 Feb 2014 17:56:00 GMT", "version": "v1" } ]
2014-02-25
[ [ "Sahai", "Ankur", "" ] ]
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1402.5644
Zhen Kan
Zhen Kan, Justin Klotz, Eduardo L. Pasiliao Jr, Warren E. Dixon
Containment Control for a Social Network with State-Dependent Connectivity
9 pages, 2 figures, submitted to Automatica
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Social interactions influence our thoughts, opinions and actions. In this paper, social interactions are studied within a group of individuals composed of influential social leaders and followers. Each person is assumed to maintain a social state, which can be an emotional state or an opinion. Followers update their social states based on the states of local neighbors, while social leaders maintain a constant desired state. Social interactions are modeled as a general directed graph where each directed edge represents an influence from one person to another. Motivated by the non-local property of fractional-order systems, the social response of individuals in the network are modeled by fractional-order dynamics whose states depend on influences from local neighbors and past experiences. A decentralized influence method is then developed to maintain existing social influence between individuals (i.e., without isolating peers in the group) and to influence the social group to a common desired state (i.e., within a convex hull spanned by social leaders). Mittag-Leffler stability methods are used to prove asymptotic stability of the networked fractional-order system.
[ { "created": "Sun, 23 Feb 2014 18:13:47 GMT", "version": "v1" } ]
2014-02-25
[ [ "Kan", "Zhen", "" ], [ "Klotz", "Justin", "" ], [ "Pasiliao", "Eduardo L.", "Jr" ], [ "Dixon", "Warren E.", "" ] ]
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1402.5645
Elshimaa Elgendi
Omar S. Soliman and Elshimaa A. R. Elgendi
A Hybrid Estimation of Distribution Algorithm with Random Walk local Search for Multi-mode Resource-Constrained Project Scheduling problems
8 pages,0 figures, Published with International Journal of Computer Trends and Technology (IJCTT). Omar S. Soliman, Elshimaa A.R. Elgendi. A Hybrid Estimation of Distribution Algorithm with Random Walk local Search for Multi-mode Resource-Constrained Project Scheduling problems. Inter J. of Computer Trends and Tech(IJCTT)8(2):57-64,2014
null
10.14445/22312803/IJCTT-V8P111
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Multi-mode resource-constrained project scheduling problems (MRCPSPs) are classified as NP-hard problems, in which a task has different execution modes characterized by different resource requirements. Estimation of distribution algorithm (EDA) has shown an effective performance for solving such real-world optimization problems but it fails to find the desired optima. This paper integrates a novel hybrid local search technique with EDA to enhance their local search ability. The new local search is based on delete-then-insert operator and a random walk (DIRW) to enhance exploitation abilities of EDA in the neighborhoods of the search space. The proposed algorithm is capable to explore and exploit the search mechanism in the search space through its outer and inner loops. The proposed algorithm is tested and evaluated using benchmark test problems of the project scheduling problem library PSPLIB. Simulation results of the proposed algorithm are compared with the classical EDA algorithm. The obtained results showed that the effectiveness of the proposed algorithm and outperformed the compared EDA algorithm.
[ { "created": "Sun, 23 Feb 2014 18:15:24 GMT", "version": "v1" } ]
2014-02-25
[ [ "Soliman", "Omar S.", "" ], [ "Elgendi", "Elshimaa A. R.", "" ] ]
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1402.5646
Natasha Morrison
Natasha Morrison, Jonathan A. Noel, Alex Scott
On Saturated $k$-Sperner Systems
17 pages
Electron. J. Combin. 21(3) (2014), #P3.22
null
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given a set $X$, a collection $\mathcal{F}\subseteq\mathcal{P}(X)$ is said to be $k$-Sperner if it does not contain a chain of length $k+1$ under set inclusion and it is saturated if it is maximal with respect to this property. Gerbner et al. conjectured that, if $|X|$ is sufficiently large with respect to $k$, then the minimum size of a saturated $k$-Sperner system $\mathcal{F}\subseteq\mathcal{P}(X)$ is $2^{k-1}$. We disprove this conjecture by showing that there exists $\varepsilon>0$ such that for every $k$ and $|X| \geq n_0(k)$ there exists a saturated $k$-Sperner system $\mathcal{F}\subseteq\mathcal{P}(X)$ with cardinality at most $2^{(1-\varepsilon)k}$. A collection $\mathcal{F}\subseteq \mathcal{P}(X)$ is said to be an oversaturated $k$-Sperner system if, for every $S\in\mathcal{P}(X)\setminus\mathcal{F}$, $\mathcal{F}\cup\{S\}$ contains more chains of length $k+1$ than $\mathcal{F}$. Gerbner et al. proved that, if $|X|\geq k$, then the smallest such collection contains between $2^{k/2-1}$ and $O\left(\frac{\log{k}}{k}2^k\right)$ elements. We show that if $|X|\geq k^2+k$, then the lower bound is best possible, up to a polynomial factor.
[ { "created": "Sun, 23 Feb 2014 18:17:48 GMT", "version": "v1" }, { "created": "Thu, 24 Jul 2014 21:54:25 GMT", "version": "v2" } ]
2014-08-22
[ [ "Morrison", "Natasha", "" ], [ "Noel", "Jonathan A.", "" ], [ "Scott", "Alex", "" ] ]
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1402.5647
Mohamed El-Zawawy Dr.
Mohamed A. El-Zawawy, Eisa A. Aleisa
A new model for Context-Oriented Programs
9 pages, 6 figures
Mohamed A. El-Zawawy, Eisa A. Aleisa. A new model for Context-Oriented Programs. Life Science Journal, 2013, 10(2), pp: 2515-2523
null
null
cs.PL cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Context-oriented programming (COP) is a new technique for programming that allows changing the context in which commands execute as a program executes. Compared to object-oriented programming (aspect-oriented programming), COP is more flexible (modular and structured). This paper presents a precise syntax-directed operational semantics for context-oriented programming with layers, as realized by COP languages like ContextJ* and ContextL. Our language model is built on Java enriched with layer concepts and activation and deactivation of layer scopes. The paper also presents a static type system that guarantees that typed programs do not get stuck. Using the means of the proposed semantics, the mathematical correctness of the type system is presented in the paper.
[ { "created": "Sun, 23 Feb 2014 18:19:23 GMT", "version": "v1" } ]
2014-02-25
[ [ "El-Zawawy", "Mohamed A.", "" ], [ "Aleisa", "Eisa A.", "" ] ]
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1402.5666
Richard Combes
Richard Combes, Alexandre Proutiere
Dynamic Rate and Channel Selection in Cognitive Radio Systems
19 pages
null
null
null
cs.IT cs.LG math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we investigate dynamic channel and rate selection in cognitive radio systems which exploit a large number of channels free from primary users. In such systems, transmitters may rapidly change the selected (channel, rate) pair to opportunistically learn and track the pair offering the highest throughput. We formulate the problem of sequential channel and rate selection as an online optimization problem, and show its equivalence to a {\it structured} Multi-Armed Bandit problem. The structure stems from inherent properties of the achieved throughput as a function of the selected channel and rate. We derive fundamental performance limits satisfied by {\it any} channel and rate adaptation algorithm, and propose algorithms that achieve (or approach) these limits. In turn, the proposed algorithms optimally exploit the inherent structure of the throughput. We illustrate the efficiency of our algorithms using both test-bed and simulation experiments, in both stationary and non-stationary radio environments. In stationary environments, the packet successful transmission probabilities at the various channel and rate pairs do not evolve over time, whereas in non-stationary environments, they may evolve. In practical scenarios, the proposed algorithms are able to track the best channel and rate quite accurately without the need of any explicit measurement and feedback of the quality of the various channels.
[ { "created": "Sun, 23 Feb 2014 20:16:41 GMT", "version": "v1" }, { "created": "Mon, 12 May 2014 17:06:23 GMT", "version": "v2" } ]
2014-05-13
[ [ "Combes", "Richard", "" ], [ "Proutiere", "Alexandre", "" ] ]
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1402.5667
Qiqi Wang
Johan Larsson and Qiqi Wang
The prospect of using LES and DES in engineering design, and the research required to get there
accepted for publication in the Royal Society Philosophical Transactions A
null
10.1098/rsta.2013.0329
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we try to look into the future to divine how large eddy and detached eddy simulations (LES and DES, respectively) will be used in the engineering design process about 20-30 years from now. Some key challenges specific to the engineering design process are identified, and some of the critical outstanding problems and promising research directions are discussed.
[ { "created": "Sun, 23 Feb 2014 20:25:06 GMT", "version": "v1" }, { "created": "Sun, 20 Apr 2014 18:33:53 GMT", "version": "v2" } ]
2014-07-31
[ [ "Larsson", "Johan", "" ], [ "Wang", "Qiqi", "" ] ]
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1402.5676
Jonathan Wheeler
G. Mourou, S. Mironov, E. Khazanov, A. Sergeev
Single Cycle Thin Film Compressor Opening the door to Zeptosecond-Exawatt Physics
6 pages, 6 figures
null
10.1140/epjst/e2014-02171-5
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article demonstrates a new compression scheme that has the potential to compress a high energy pulse as high as a few hundred Joules in a pulse as short as one optical cycle at 0.8{\mu}m making a true ultra-relativistic {\lambda}^3 pulse. This pulse could have a focused intensity of 10^24W/cm2 or a0 of 1000. It could form an efficient, 10%, relativistic mirror that could compress the pulse to the atto-zeptosecond regime, with an upshifted wavelength of 1-10keV. This technique could be a watershed making the entry of petawatt pulses into the exawatt and zeptosecond regime possible.
[ { "created": "Sun, 23 Feb 2014 21:12:52 GMT", "version": "v1" } ]
2015-06-18
[ [ "Mourou", "G.", "" ], [ "Mironov", "S.", "" ], [ "Khazanov", "E.", "" ], [ "Sergeev", "A.", "" ] ]
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1402.5681
Maarten L\"offler
Kevin Buchin and Irina Kostitsyna and Maarten L\"offler and Rodrigo I. Silveira
Region-based approximation of probability distributions (for visibility between imprecise points among obstacles)
null
null
10.1007/s00453-019-00551-2
null
cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $p$ and $q$ be two imprecise points, given as probability density functions on $\mathbb R^2$, and let $\cal R$ be a set of $n$ line segments (obstacles) in $\mathbb R^2$. We study the problem of approximating the probability that $p$ and $q$ can see each other; that is, that the segment connecting $p$ and $q$ does not cross any segment of $\cal R$. To solve this problem, we approximate each density function by a weighted set of polygons; a novel approach to dealing with probability density functions in computational geometry.
[ { "created": "Sun, 23 Feb 2014 21:35:00 GMT", "version": "v1" }, { "created": "Tue, 2 Dec 2014 16:14:26 GMT", "version": "v2" } ]
2019-03-12
[ [ "Buchin", "Kevin", "" ], [ "Kostitsyna", "Irina", "" ], [ "Löffler", "Maarten", "" ], [ "Silveira", "Rodrigo I.", "" ] ]
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1402.5683
Chi Xiong
Chi Xiong, Wolfram Pernice, Mo Li, Michael Rooks and Hong X. Tang
Adiabatic embedment of nanomechanical resonators in photonic microring cavities
null
Appl. Phys. Lett. 96, 263101 (2010)
10.1063/1.3458692
null
physics.optics cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report a circuit cavity optomechanical system in which a nanomechanical resonator is adiabatically embedded inside an optical ring resonator with ultralow transition loss. The nanomechanical device forms part of the top layer of a horizontal silicon slot ring resonator, which enables dispersive coupling to the dielectric substrate via a tapered nanogap. Our measurements show nearly uncompromised optical quality factors (Q) after the release of the mechanical beam.
[ { "created": "Sun, 23 Feb 2014 21:58:03 GMT", "version": "v1" } ]
2014-03-05
[ [ "Xiong", "Chi", "" ], [ "Pernice", "Wolfram", "" ], [ "Li", "Mo", "" ], [ "Rooks", "Michael", "" ], [ "Tang", "Hong X.", "" ] ]
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1402.5684
Orhan Firat
Orhan Firat and Mete Ozay and Ilke Oztekin and Fatos T. Yarman Vural
Discriminative Functional Connectivity Measures for Brain Decoding
This paper has been withdrawn
null
null
null
cs.AI cs.CE cs.CV cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a statistical learning model for classifying cognitive processes based on distributed patterns of neural activation in the brain, acquired via functional magnetic resonance imaging (fMRI). In the proposed learning method, local meshes are formed around each voxel. The distance between voxels in the mesh is determined by using a functional neighbourhood concept. In order to define the functional neighbourhood, the similarities between the time series recorded for voxels are measured and functional connectivity matrices are constructed. Then, the local mesh for each voxel is formed by including the functionally closest neighbouring voxels in the mesh. The relationship between the voxels within a mesh is estimated by using a linear regression model. These relationship vectors, called Functional Connectivity aware Local Relational Features (FC-LRF) are then used to train a statistical learning machine. The proposed method was tested on a recognition memory experiment, including data pertaining to encoding and retrieval of words belonging to ten different semantic categories. Two popular classifiers, namely k-nearest neighbour (k-nn) and Support Vector Machine (SVM), are trained in order to predict the semantic category of the item being retrieved, based on activation patterns during encoding. The classification performance of the Functional Mesh Learning model, which range in 62%-71% is superior to the classical multi-voxel pattern analysis (MVPA) methods, which range in 40%-48%, for ten semantic categories.
[ { "created": "Sun, 23 Feb 2014 22:01:11 GMT", "version": "v1" }, { "created": "Thu, 6 Mar 2014 19:02:07 GMT", "version": "v2" } ]
2014-03-07
[ [ "Firat", "Orhan", "" ], [ "Ozay", "Mete", "" ], [ "Oztekin", "Ilke", "" ], [ "Vural", "Fatos T. Yarman", "" ] ]
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1402.5686
Yang Liu
Yang Liu, Yi Xuan, Xiaoxiao Xue, Pei-Hsun Wang, Andrew J. Metcalf, Steve Chen, Minghao Qi, and Andrew M. Weiner
Investigation of Mode Interaction in Optical Microresonators for Kerr Frequency Comb Generation
null
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mode interaction in silicon nitride micro-resonators is investigated. We provide clear experimental evidence of mode interaction between two family modes and mode interaction is demonstrated to be the cause of the comb generation in resonators with normal dispersion.
[ { "created": "Sun, 23 Feb 2014 22:33:57 GMT", "version": "v1" } ]
2014-02-25
[ [ "Liu", "Yang", "" ], [ "Xuan", "Yi", "" ], [ "Xue", "Xiaoxiao", "" ], [ "Wang", "Pei-Hsun", "" ], [ "Metcalf", "Andrew J.", "" ], [ "Chen", "Steve", "" ], [ "Qi", "Minghao", "" ], [ "Weiner", "Andrew M.", "" ] ]
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1402.5687
Dusko Pavlovic
Dusko Pavlovic
Monoidal computer II: Normal complexity by string diagrams
11 pages, 18 figures
null
null
null
cs.LO cs.CC math.CT math.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In Monoidal Computer I, we introduced a categorical model of computation where the formal reasoning about computability was supported by the simple and popular diagrammatic language of string diagrams. In the present paper, we refine and extend that model of computation to support a formal complexity theory as well. This formalization brings to the foreground the concept of normal complexity measures, which allow decompositions akin to Kleene's normal form. Such measures turn out to be just those where evaluating the complexity of a program does not require substantially more resources than evaluating the program itself. The usual time and space complexity are thus normal measures, whereas the average and the randomized complexity measures are not. While the measures that are not normal provide important design time information about algorithms, and for theoretical analyses, normal measures can also be used at run time, as practical tools of computation, e.g. to set the bounds for hypothesis testing, inductive inference and algorithmic learning.
[ { "created": "Sun, 23 Feb 2014 22:59:30 GMT", "version": "v1" } ]
2014-02-25
[ [ "Pavlovic", "Dusko", "" ] ]
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1402.5691
Rodrigo de Lamare
S. Somasundaram, P. Li, N. Parsons and R. C. de Lamare
Data-Adaptive Reduced-Dimension Robust Beamforming Algorithms
5 pages, 2 figures
null
null
null
cs.IT cs.SY math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present low complexity, quickly converging robust adaptive beamformers that combine robust Capon beamformer (RCB) methods and data-adaptive Krylov subspace dimensionality reduction techniques. We extend a recently proposed reduced-dimension RCB framework, which ensures proper combination of RCBs with any form of dimensionality reduction that can be expressed using a full-rank dimension reducing transform, providing new results for data-adaptive dimensionality reduction. We consider Krylov subspace methods computed with the Powers-of-R (PoR) and Conjugate Gradient (CG) techniques, illustrating how a fast CG-based algorithm can be formed by beneficially exploiting that the CG-algorithm diagonalizes the reduced-dimension covariance. Our simulations show the benefits of the proposed approaches.
[ { "created": "Sun, 23 Feb 2014 23:59:39 GMT", "version": "v1" } ]
2014-02-25
[ [ "Somasundaram", "S.", "" ], [ "Li", "P.", "" ], [ "Parsons", "N.", "" ], [ "de Lamare", "R. C.", "" ] ]
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1402.5692
Rodrigo de Lamare
A. G. D. Uchoa, C. T. Healy and R. C. de Lamare
Repeat Accumulate Based Designs for LDPC Codes on Fading Channels
5 pages, 7 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Irregular repeat-accumulate Root-Check LDPC codes based on Progressive Edge Growth (PEG) techniques for block-fading channels are proposed. The proposed Root-Check LDPC codes are {both suitable for channels under $F = 2, 3$ independent fadings per codeword and} for fast fading channels. An IRA(A) Root-Check structure is devised for $F = 2, 3$ independent fadings. The performance of the new codes is investigated in terms of the Frame Error Rate (FER). Numerical results show that the IRAA LDPC codes constructed by the proposed algorithm {outperform by about 1dB the existing} IRA Root-Check LDPC codes under fast-fading channels.
[ { "created": "Mon, 24 Feb 2014 00:09:28 GMT", "version": "v1" } ]
2014-02-25
[ [ "Uchoa", "A. G. D.", "" ], [ "Healy", "C. T.", "" ], [ "de Lamare", "R. C.", "" ] ]
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1402.5693
Reza Parseh
Reza Parseh, Kimmo Kansanen
On Estimation Error Outage for Scalar Gauss-Markov Signals Sent Over Fading Channels
21 pages, 5 figures, conference version at EUSIPCO 2014, accepted for publication in IEEE Transactions on Signal Processing
null
10.1109/TSP.2014.2360820
null
cs.IT math.IT math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Measurements of a scalar linear Gauss-Markov process are sent over a fading channel. The fading channel is modeled as independent and identically distributed random variables with known realization at the receiver. The optimal estimator at the receiver is the Kalman filter. In contrast to the classical Kalman filter theory, given a random channel, the Kalman gain and the error covariance become random. Then the probability distribution function of expected estimation error and its outage probability can be chosen for estimation quality assessment. In this paper and in order to get the estimation error outage, we provide means to characterize the stationary probability density function of the random expected estimation error. Furthermore and for the particular case of the i.i.d. Rayleigh fading channels, upper and lower bounds for the outage probability are derived which provide insight and simpler means for design purposes. We also show that the bounds are tight for the high SNR regime, and that the outage probability decreases linearly with the inverse of the average channel SNR.
[ { "created": "Mon, 24 Feb 2014 00:23:05 GMT", "version": "v1" }, { "created": "Fri, 25 Apr 2014 10:16:06 GMT", "version": "v2" }, { "created": "Fri, 17 Oct 2014 09:53:23 GMT", "version": "v3" } ]
2014-10-20
[ [ "Parseh", "Reza", "" ], [ "Kansanen", "Kimmo", "" ] ]
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1402.5697
Changxin Gao
Changxin Gao, Feifei Chen, Jin-Gang Yu, Rui Huang, Nong Sang
Exemplar-based Linear Discriminant Analysis for Robust Object Tracking
ICIP2014
null
10.1109/ICIP.2014.7025077
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Tracking-by-detection has become an attractive tracking technique, which treats tracking as a category detection problem. However, the task in tracking is to search for a specific object, rather than an object category as in detection. In this paper, we propose a novel tracking framework based on exemplar detector rather than category detector. The proposed tracker is an ensemble of exemplar-based linear discriminant analysis (ELDA) detectors. Each detector is quite specific and discriminative, because it is trained by a single object instance and massive negatives. To improve its adaptivity, we update both object and background models. Experimental results on several challenging video sequences demonstrate the effectiveness and robustness of our tracking algorithm.
[ { "created": "Mon, 24 Feb 2014 01:10:09 GMT", "version": "v1" } ]
2015-10-13
[ [ "Gao", "Changxin", "" ], [ "Chen", "Feifei", "" ], [ "Yu", "Jin-Gang", "" ], [ "Huang", "Rui", "" ], [ "Sang", "Nong", "" ] ]
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