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1402.1898
Philipp Korneev a
Philipp Korneev
Harmonics Generation in Ultra-Thin Nanofilms Irradiated by Intense Nonrelativistic Short Laser Pulse
null
null
10.1134/S1054660X11230095
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The problem of harmonics generation in nanotargets is considered at the range of parameters (a nanotarget diameter and a pump laser intensity) when the oscillation amplitude of an electron in a target is much larger than the target width. Electron motion in charged nanotargets in the presence of a laser field of different (non-relativistic) strength is considered. It is demonstarted that for lasers of infrared frequencies clusters do not posess strong enough potential to bound electrons with large oscillation amplitudes. Opposite to clusters, nanofilms were found to be very perspective targets in the problem considered. A simple analytic model and molecular dynamic simulations showed increased harmonics generation when the oscillation amplitude of electrons in a film becomes much larger, than the film width. Different regimes of generation are briefly discussed.
[ { "created": "Sat, 8 Feb 2014 23:29:10 GMT", "version": "v1" } ]
2014-02-11
[ [ "Korneev", "Philipp", "" ] ]
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1402.1899
Laurent Bako
Laurent Bako and Henrik Ohlsson
Analysis of A Nonsmooth Optimization Approach to Robust Estimation
17 pages, 9 figures
Automatica, vol. 66, pp. 132-145, 2016
null
null
cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we consider the problem of identifying a linear map from measurements which are subject to intermittent and arbitarily large errors. This is a fundamental problem in many estimation-related applications such as fault detection, state estimation in lossy networks, hybrid system identification, robust estimation, etc. The problem is hard because it exhibits some intrinsic combinatorial features. Therefore, obtaining an effective solution necessitates relaxations that are both solvable at a reasonable cost and effective in the sense that they can return the true parameter vector. The current paper discusses a nonsmooth convex optimization approach and provides a new analysis of its behavior. In particular, it is shown that under appropriate conditions on the data, an exact estimate can be recovered from data corrupted by a large (even infinite) number of gross errors.
[ { "created": "Sat, 8 Feb 2014 23:30:18 GMT", "version": "v1" }, { "created": "Sat, 20 Dec 2014 23:33:20 GMT", "version": "v2" }, { "created": "Tue, 21 Jun 2016 08:13:21 GMT", "version": "v3" }, { "created": "Sun, 7 Aug 2016 22:07:36 GMT", "version": "v4" } ]
2016-08-09
[ [ "Bako", "Laurent", "" ], [ "Ohlsson", "Henrik", "" ] ]
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1402.1904
Joseph Calvey
J.R. Calvey, W. Hartung, Y. Li, J.A. Livezey, J. Makita, M.A. Palmer, D. Rubin
Comparison of Electron Cloud Mitigating Coatings Using Retarding Field Analyzers
null
null
10.1016/j.nima.2014.05.051
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In 2008, the Cornell Electron Storage Ring (CESR) was reconfigured to serve as a test accelerator (CESR-TA) for next generation lepton colliders, in particular for the ILC damping ring. A significant part of this program has been the installation of diagnostic devices to measure and quantify the electron cloud effect, a potential limiting factor in these machines. One such device is the Retarding Field Analyzer (RFA), which provides information on the local electron cloud density and energy distribution. Several different styles of RFAs have been designed, tested, and deployed throughout the CESR ring. They have been used to study the growth of the cloud in different beam conditions, and to evaluate the efficacy of different mitigation techniques. This paper will provide an overview of RFA results obtained in a magnetic field free environment.
[ { "created": "Sun, 9 Feb 2014 01:32:52 GMT", "version": "v1" }, { "created": "Fri, 21 Mar 2014 16:14:58 GMT", "version": "v2" } ]
2015-06-18
[ [ "Calvey", "J. R.", "" ], [ "Hartung", "W.", "" ], [ "Li", "Y.", "" ], [ "Livezey", "J. A.", "" ], [ "Makita", "J.", "" ], [ "Palmer", "M. A.", "" ], [ "Rubin", "D.", "" ] ]
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1402.1918
Yuchen Zhang
Yuchen Zhang, Martin J. Wainwright, Michael I. Jordan
Lower bounds on the performance of polynomial-time algorithms for sparse linear regression
null
null
null
null
math.ST cs.CC stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Under a standard assumption in complexity theory (NP not in P/poly), we demonstrate a gap between the minimax prediction risk for sparse linear regression that can be achieved by polynomial-time algorithms, and that achieved by optimal algorithms. In particular, when the design matrix is ill-conditioned, the minimax prediction loss achievable by polynomial-time algorithms can be substantially greater than that of an optimal algorithm. This result is the first known gap between polynomial and optimal algorithms for sparse linear regression, and does not depend on conjectures in average-case complexity.
[ { "created": "Sun, 9 Feb 2014 06:02:29 GMT", "version": "v1" }, { "created": "Wed, 21 May 2014 05:41:06 GMT", "version": "v2" } ]
2014-05-22
[ [ "Zhang", "Yuchen", "" ], [ "Wainwright", "Martin J.", "" ], [ "Jordan", "Michael I.", "" ] ]
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1402.1919
Abubakar Bappah
Abubakar Sadiq Bappah
Appraisal of Social Learning Potentials in Some Trending Mobile Computing Applications
5 pages, Published with International Journal of Computer Trends and Technology (IJCTT)
International Journal of Computer Trends and Technology (IJCTT) volume 4 Issue 7 July 2013 pp 2017 to 2021
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cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
New Mobile technologies have created a new social dimension where individuals can develop increased levels of their social awareness by keeping in touch with old friends, making new friends, dispense new data or product, and getting information in many more aspects of everyday lives, making one to become more knowledgeable which is very beneficial especially for students. Social networks, in particular enable users to share and discuss common interests and provide infrastructures for integrating various user experiences: synchronous and asynchronous communication, game-playing, sharing links and files. The trend of using social networks and social media to deliver and exchange knowledge could bring a new era of social learning in which learners make use all four language skills of reading, writing, listening and speaking. Unlike a traditional e-leaning paradigm with pre-defined curriculum and standard textbooks, social knowledge could be aggregated on demand, just in time, and in context of engaging challenges from social networks, making learning more exciting, social and, game-like experience. Social learning environment engages the learners in discussion, collaboration, exploration, production, discovery and creation. Schools should harness this to develop group collaboration skills and even project based learning activities that span subjects and grade levels. This paper focuses on technologies and avenues of using mobile phones in supporting open social learning among undergraduate students in Nigeria.
[ { "created": "Sun, 9 Feb 2014 06:43:52 GMT", "version": "v1" } ]
2014-02-11
[ [ "Bappah", "Abubakar Sadiq", "" ] ]
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1402.1921
Zhenhua Wang
Qinfeng Shi, Mark Reid, Tiberio Caetano, Anton van den Hengel and Zhenhua Wang
A Hybrid Loss for Multiclass and Structured Prediction
12 pages, 5 figures. arXiv admin note: substantial text overlap with arXiv:1009.3346
null
null
null
cs.LG cs.AI cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a novel hybrid loss for multiclass and structured prediction problems that is a convex combination of a log loss for Conditional Random Fields (CRFs) and a multiclass hinge loss for Support Vector Machines (SVMs). We provide a sufficient condition for when the hybrid loss is Fisher consistent for classification. This condition depends on a measure of dominance between labels--specifically, the gap between the probabilities of the best label and the second best label. We also prove Fisher consistency is necessary for parametric consistency when learning models such as CRFs. We demonstrate empirically that the hybrid loss typically performs least as well as--and often better than--both of its constituent losses on a variety of tasks, such as human action recognition. In doing so we also provide an empirical comparison of the efficacy of probabilistic and margin based approaches to multiclass and structured prediction.
[ { "created": "Sun, 9 Feb 2014 06:47:17 GMT", "version": "v1" } ]
2014-02-11
[ [ "Shi", "Qinfeng", "" ], [ "Reid", "Mark", "" ], [ "Caetano", "Tiberio", "" ], [ "Hengel", "Anton van den", "" ], [ "Wang", "Zhenhua", "" ] ]
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1402.1922
Georg Moser
Martin Hofmann and Georg Moser
Amortised Resource Analysis and Typed Polynomial Interpretations (extended version)
25 pages
null
null
null
cs.LO cs.PL
http://creativecommons.org/licenses/by/3.0/
We introduce a novel resource analysis for typed term rewrite systems based on a potential-based type system. This type system gives rise to polynomial bounds on the innermost runtime complexity. We relate the thus obtained amortised resource analysis to polynomial interpretations and obtain the perhaps surprising result that whenever a rewrite system R can be well-typed, then there exists a polynomial interpretation that orients R. For this we adequately adapt the standard notion of polynomial interpretations to the typed setting.
[ { "created": "Sun, 9 Feb 2014 07:08:04 GMT", "version": "v1" }, { "created": "Fri, 14 Mar 2014 11:39:15 GMT", "version": "v2" } ]
2014-03-17
[ [ "Hofmann", "Martin", "" ], [ "Moser", "Georg", "" ] ]
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1402.1925
Priyadharshini
Priyadharshini.V and Malathi.A
Survey on software testing techniques in cloud computing
5 pages, 2 figures. volume 4 issue 8 august 2013
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cloud computing is the next stage of the internet evolution. It relies on sharing of resources to achieve coherence on a network. It is emerged as new computing standard that impacts several different research fields, including software testing. There are various software techniques used for testing application. It not only changes the way of obtaining computing resources but also changes the way of managing and delivering computing services, technologies and solutions, meanwhile it causes new issues, challenges and needs in software testing. Software testing in cloud can reduce the need for hardware and software resources and offer a flexible and efficient alternative to the traditional software testing process. This paper provides an overview regarding trends, oppurtunities, challenges, issues, and needs in cloud testing and cloud based application.
[ { "created": "Sun, 9 Feb 2014 07:59:32 GMT", "version": "v1" } ]
2014-02-11
[ [ "V", "Priyadharshini.", "" ], [ "A", "Malathi.", "" ] ]
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1402.1931
Ahmed Rashid
Rashid Ahmed, John A. Avaritsiotis
MCA Learning Algorithm for Incident Signals Estimation: A Review
5 pages,8 figures, 1 table. International Journal of Computer Trends and Technology (IJCTT),Feb 2014
null
null
null
cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recently there has been many works on adaptive subspace filtering in the signal processing literature. Most of them are concerned with tracking the signal subspace spanned by the eigenvectors corresponding to the eigenvalues of the covariance matrix of the signal plus noise data. Minor Component Analysis (MCA) is important tool and has a wide application in telecommunications, antenna array processing, statistical parametric estimation, etc. As an important feature extraction technique, MCA is a statistical method of extracting the eigenvector associated with the smallest eigenvalue of the covariance matrix. In this paper, we will present a MCA learning algorithm to extract minor component from input signals, and the learning rate parameter is also presented, which ensures fast convergence of the algorithm, because it has direct effect on the convergence of the weight vector and the error level is affected by this value. MCA is performed to determine the estimated DOA. Simulation results will be furnished to illustrate the theoretical results achieved.
[ { "created": "Sun, 9 Feb 2014 09:55:13 GMT", "version": "v1" } ]
2014-02-11
[ [ "Ahmed", "Rashid", "" ], [ "Avaritsiotis", "John A.", "" ] ]
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1402.1932
Prince Jain mr
Dr. Rahul Malhotra and Prince Jain
An EMUSIM Technique and its Components in Cloud Computing- A Review
6 pages, 3 figures and "Published with International Journal of Computer Trends and Technology (IJCTT)"
International Journal of Computer Trends and Technology (IJCTT) 4(8): 2435-2440 August 2013
10.14445/2231-2803
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent efforts to design and develop Cloud technologies focus on defining novel methods, policies and mechanisms for efficiently managing Cloud infrastructures. One key challenge potential Cloud customers have before renting resources is to know how their services will behave in a set of resources and the costs involved when growing and shrinking their resource pool. Most of the studies in this area rely on simulation-based experiments, which consider simplified modeling of applications and computing environment. In order to better predict service's behavior on Cloud platforms, an integrated architecture that is based on both simulation and emulation. The proposed architecture, named EMUSIM, automatically extracts information from application behavior via emulation and then uses this information to generate the corresponding simulation model. This paper presents brief overview of the EMUSIM technique and its components. The work in this paper focuses on architecture and operation details of Automated Emulation Framework (AEF), QAppDeployer and proposes Cloud Sim Application for Simulation techniques.
[ { "created": "Sun, 9 Feb 2014 10:10:48 GMT", "version": "v1" } ]
2014-02-11
[ [ "Malhotra", "Dr. Rahul", "" ], [ "Jain", "Prince", "" ] ]
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1402.1936
N. Jesper Larsson
N. Jesper Larsson
Integer Set Compression and Statistical Modeling
null
null
null
null
cs.IT cs.DS math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Compression of integer sets and sequences has been extensively studied for settings where elements follow a uniform probability distribution. In addition, methods exist that exploit clustering of elements in order to achieve higher compression performance. In this work, we address the case where enumeration of elements may be arbitrary or random, but where statistics is kept in order to estimate probabilities of elements. We present a recursive subset-size encoding method that is able to benefit from statistics, explore the effects of permuting the enumeration order based on element probabilities, and discuss general properties and possibilities for this class of compression problem.
[ { "created": "Sun, 9 Feb 2014 11:28:41 GMT", "version": "v1" } ]
2014-02-11
[ [ "Larsson", "N. Jesper", "" ] ]
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1402.1939
Xiao-Yong Yan
Xiao-Yong Yan and Petter Minnhagen
Maximum Entropy, Word-Frequency, Chinese Characters, and Multiple Meanings
15 pages, 10 figures, 2 tables
PLoS ONE 10(5): e0125592 (2015)
10.1371/journal.pone.0125592
null
physics.soc-ph cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The word-frequency distribution of a text written by an author is well accounted for by a maximum entropy distribution, the RGF (random group formation)-prediction. The RGF-distribution is completely determined by the a priori values of the total number of words in the text (M), the number of distinct words (N) and the number of repetitions of the most common word (k_max). It is here shown that this maximum entropy prediction also describes a text written in Chinese characters. In particular it is shown that although the same Chinese text written in words and Chinese characters have quite differently shaped distributions, they are nevertheless both well predicted by their respective three a priori characteristic values. It is pointed out that this is analogous to the change in the shape of the distribution when translating a given text to another language. Another consequence of the RGF-prediction is that taking a part of a long text will change the input parameters (M, N, k_max) and consequently also the shape of the frequency distribution. This is explicitly confirmed for texts written in Chinese characters. Since the RGF-prediction has no system-specific information beyond the three a priori values (M, N, k_max), any specific language characteristic has to be sought in systematic deviations from the RGF-prediction and the measured frequencies. One such systematic deviation is identified and, through a statistical information theoretical argument and an extended RGF-model, it is proposed that this deviation is caused by multiple meanings of Chinese characters. The effect is stronger for Chinese characters than for Chinese words. The relation between Zipf's law, the Simon-model for texts and the present results are discussed.
[ { "created": "Sun, 9 Feb 2014 11:47:15 GMT", "version": "v1" }, { "created": "Sun, 29 Mar 2015 07:37:36 GMT", "version": "v2" } ]
2017-10-03
[ [ "Yan", "Xiao-Yong", "" ], [ "Minnhagen", "Petter", "" ] ]
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1402.1940
Nino Vincenzo Verde
Nino Vincenzo Verde, Giuseppe Ateniese, Emanuele Gabrielli, Luigi Vincenzo Mancini, Angelo Spognardi
No NAT'd User left Behind: Fingerprinting Users behind NAT from NetFlow Records alone
null
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is generally recognized that the traffic generated by an individual connected to a network acts as his biometric signature. Several tools exploit this fact to fingerprint and monitor users. Often, though, these tools assume to access the entire traffic, including IP addresses and payloads. This is not feasible on the grounds that both performance and privacy would be negatively affected. In reality, most ISPs convert user traffic into NetFlow records for a concise representation that does not include, for instance, any payloads. More importantly, large and distributed networks are usually NAT'd, thus a few IP addresses may be associated to thousands of users. We devised a new fingerprinting framework that overcomes these hurdles. Our system is able to analyze a huge amount of network traffic represented as NetFlows, with the intent to track people. It does so by accurately inferring when users are connected to the network and which IP addresses they are using, even though thousands of users are hidden behind NAT. Our prototype implementation was deployed and tested within an existing large metropolitan WiFi network serving about 200,000 users, with an average load of more than 1,000 users simultaneously connected behind 2 NAT'd IP addresses only. Our solution turned out to be very effective, with an accuracy greater than 90%. We also devised new tools and refined existing ones that may be applied to other contexts related to NetFlow analysis.
[ { "created": "Sun, 9 Feb 2014 11:59:06 GMT", "version": "v1" } ]
2014-02-11
[ [ "Verde", "Nino Vincenzo", "" ], [ "Ateniese", "Giuseppe", "" ], [ "Gabrielli", "Emanuele", "" ], [ "Mancini", "Luigi Vincenzo", "" ], [ "Spognardi", "Angelo", "" ] ]
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1402.1943
Ravi Raykundaliya
G. Vijay Kumar, Ravikumar S. Raykundaliya, Dr. P. Naga Prasad
Proactive Web Server Protocol for Complaint Assessment
null
International Journal of Computer Trends and Technology (IJCTT) 6(40):4-6, December 2013
null
null
cs.NI cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Vulnerability Discovery with attack Injection security threats are increasing for the server software, when software is developed, the software tested for the functionality. Due to unawareness of software vulnerabilities most of the software before pre-Release the software should be thoroughly tested for not only functionality reliability, but should be tested for the security flows (or) vulnerabilities. The approaches such as fuzzers, Fault injection, vulnerabilities scanners, static vulnerabilities analyzers, Run time prevention mechanisms and software Rejuvenation are identifying the un-patched software which is open for security threats address to solve the problem "security testing". These techniques are useful for generating attacks but cannot be extendable for the new land of attacks. The system called proactive vulnerability attack injection tool is suitable for adding new attacks injection vectors, methods to define new protocol states (or) Specification using the interface of tool includes Network server protocol specification using GUI, Attacks generator, Attack injector, monitoring module at the victim injector, monitoring module at the victim machine and the attacks injection report generation. This tool can address most of the vulnerabilities (or) security flows.
[ { "created": "Sun, 9 Feb 2014 12:13:22 GMT", "version": "v1" } ]
2014-02-12
[ [ "Kumar", "G. Vijay", "" ], [ "Raykundaliya", "Ravikumar S.", "" ], [ "Prasad", "Dr. P. Naga", "" ] ]
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1402.1945
Andreas Schrimpf
Andreas Schrimpf
An international campaign of the 19th century to determine the solar parallax - The US Naval expedition to the southern hemisphere 1849 - 1852
20 pages, 7 figures
Eur. Phys. J. H., February, 2014
10.1140/epjh/e2013-40036-2
null
physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In 1847 Christian Ludwig Gerling, Marburg (Germany), suggested the solar parallax to be determined by measuring the position of Venus close to its inferior conjunction, especially at the stationary points, from observatories on nearly the same meridian but widely differing in latitude. James M. Gilliss,astronomer at the newly founded U.S. Naval Observatory, enthusiastically adopted this idea and procured a grant for the young astronomical community of the United States for an expedition to Chile. There they were to observe several conjunctions of Venus and oppositions of Mars, while the accompanying measurements were to be taken at the US Naval Observatory in Washington D.C. and the Harvard College Observatory at Cambridge, USA. This expedition was supported by A. v. Humboldt, C.F. Gau{\ss}, J.F. Encke, S.C. Walker, A.D. Bache, B. Peirce and others. From 1849 to 1852 not only were astronomical, but also meteorological and magnetic observations and measurements recorded, mainly in Santa Lucia close to Santiago, Chile. By comparing these measurements with those taken simultaneously at other observatories around the world the solar parallax could be calculated, although incomplete data from the corresponding northern observatories threatened the project's success. In retrospect this expedition can be recognized as the foundation of the Chilean astronomy. The first director of the new National Astronomical Observatory of Chile was Dr. C.W. Moesta, a Hessian student of Christian Ludwig Gerling's. The exchange of data between German, American and other astronomers during this expedition was well mediated by J.G. Fl\"ugel, consul of the United States of America and representative of the Smithsonian Institution in Europe, who altogether played a major role in nurturing the relationship between the growing scientific community in the U.S. and the well established one in Europe at that time.
[ { "created": "Sun, 9 Feb 2014 12:47:04 GMT", "version": "v1" } ]
2014-02-11
[ [ "Schrimpf", "Andreas", "" ] ]
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1402.1946
Prajwal Thakare
Prajwal R Thakare, K. Hanumantha Rao
Anomaly Detection Based on Access Behavior and Document Rank Algorithm
6 pages, 3 figures
International Journal of Computer Trends and Technology (IJCTT) 6(39):4-6, December 2013
null
null
cs.NI cs.CR cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Distributed denial of service(DDos) attack is ongoing dangerous threat to the Internet. Commonly, DDos attacks are carried out at the network layer, e.g. SYN flooding, ICMP flooding and UDP flooding, which are called Distributed denial of service attacks. The intention of these DDos attacks is to utilize the network bandwidth and deny service to authorize users of the victim systems. Obtain from the low layers, new application-layer-based DDos attacks utilizing authorize HTTP requests to overload victim resources are more undetectable. When these are taking place during crowd events of any popular website, this is the case is very serious. The state-of-art approaches cannot handle the situation where there is no considerable deviation between the normal and the attackers activity. The page rank and proximity graph representation of online web accesses takes much time in practice. There should be less computational complexity, than of proximity graph search. Hence proposing Web Access Table mechanism to hold the data such as "who accessed what and how many times, and their rank on average" to find the anomalous web access behavior. The system takes less computational complexity and may produce considerable time complexity.
[ { "created": "Sun, 9 Feb 2014 12:50:58 GMT", "version": "v1" } ]
2014-02-11
[ [ "Thakare", "Prajwal R", "" ], [ "Rao", "K. Hanumantha", "" ] ]
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1402.1947
Farrukh Arslan
Farrukh Arslan
Classification Tree Diagrams in Health Informatics Applications
In the Proceedings of 7th International Conference on the Theory and Application of Diagrams 2012. 7th International Conference on the Theory and Application of Diagrams 2012
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null
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cs.IR cs.CV cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Health informatics deal with the methods used to optimize the acquisition, storage and retrieval of medical data, and classify information in healthcare applications. Healthcare analysts are particularly interested in various computer informatics areas such as; knowledge representation from data, anomaly detection, outbreak detection methods and syndromic surveillance applications. Although various parametric and non-parametric approaches are being proposed to classify information from data, classification tree diagrams provide an interactive visualization to analysts as compared to other methods. In this work we discuss application of classification tree diagrams to classify information from medical data in healthcare applications.
[ { "created": "Sun, 9 Feb 2014 13:02:51 GMT", "version": "v1" } ]
2014-02-11
[ [ "Arslan", "Farrukh", "" ] ]
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1402.1952
Raffaele Gratton
Francesca Matteucci, Raffaele Gratton
Women in Italian astronomy
10 pages; document prepared for INAF-Astrophysical National Institute, Italy
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astro-ph.IM physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This document gives some quantitative facts about the role of women in Italian astronomy. More than 26% of Italian IAU members are women: this is the largest fraction among the world leading countries in astronomy. Most of this high fraction is due to their presence in INAF, where women make up 32% of the research staff (289 out of 908) and 40% of the technical/administrative staff (173 out of 433); the percentage is slightly lower among permanent research staff (180 out of 599, about 30%). The presence of women is lower in the Universities (27 out of 161, about 17%, among staff). In spite of these (mildly) positive facts, we notice that similarly to other countries (e.g. USA and Germany) career prospects for Italian astronomers are clearly worse for women than for men. Within INAF, the fraction of women is about 35-40% among non-permanent position, 36% for Investigators, 17% for Associato/Primo Ricercatore, and only 13% among Ordinario/Dirigente di Ricerca. The situation is even worse at University (only 6% of Professore Ordinario are women). We found that similar trends are also present if researchers are ordered according to citation rather than position: for instance, women make up only 15% among the 100 most cited astronomers working in Italy, a percentage which is however twice that over all Europe. A similar fraction is found among first authors of most influential papers, which cannot be explained as a residual of a lower female presence in the past. We conclude that implicit sex discrimination factors probably dominate over explicit ones and are still strongly at work. Finally, we discuss the possible connection between the typical career pattern and these factors.
[ { "created": "Sun, 9 Feb 2014 13:48:26 GMT", "version": "v1" } ]
2014-02-11
[ [ "Matteucci", "Francesca", "" ], [ "Gratton", "Raffaele", "" ] ]
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1402.1956
Lakhdar Sais
Said Jabbour and Jerry Lonlac and Lakhdar Sais and Yakoub Salhi
Revisiting the Learned Clauses Database Reduction Strategies
null
null
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we revisit an important issue of CDCL-based SAT solvers, namely the learned clauses database management policies. Our motivation takes its source from a simple observation on the remarkable performances of both random and size-bounded reduction strategies. We first derive a simple reduction strategy, called Size-Bounded Randomized strategy (in short SBR), that combines maintaing short clauses (of size bounded by k), while deleting randomly clauses of size greater than k. The resulting strategy outperform the state-of-the-art, namely the LBD based one, on SAT instances taken from the last SAT competition. Reinforced by the interest of keeping short clauses, we propose several new dynamic variants, and we discuss their performances.
[ { "created": "Sun, 9 Feb 2014 15:14:24 GMT", "version": "v1" } ]
2014-02-11
[ [ "Jabbour", "Said", "" ], [ "Lonlac", "Jerry", "" ], [ "Sais", "Lakhdar", "" ], [ "Salhi", "Yakoub", "" ] ]
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1402.1958
Arthur Guez
Arthur Guez, David Silver, Peter Dayan
Better Optimism By Bayes: Adaptive Planning with Rich Models
11 pages, 11 figures
null
null
null
cs.AI cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The computational costs of inference and planning have confined Bayesian model-based reinforcement learning to one of two dismal fates: powerful Bayes-adaptive planning but only for simplistic models, or powerful, Bayesian non-parametric models but using simple, myopic planning strategies such as Thompson sampling. We ask whether it is feasible and truly beneficial to combine rich probabilistic models with a closer approximation to fully Bayesian planning. First, we use a collection of counterexamples to show formal problems with the over-optimism inherent in Thompson sampling. Then we leverage state-of-the-art techniques in efficient Bayes-adaptive planning and non-parametric Bayesian methods to perform qualitatively better than both existing conventional algorithms and Thompson sampling on two contextual bandit-like problems.
[ { "created": "Sun, 9 Feb 2014 15:38:57 GMT", "version": "v1" } ]
2014-02-11
[ [ "Guez", "Arthur", "" ], [ "Silver", "David", "" ], [ "Dayan", "Peter", "" ] ]
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1402.1961
Vladyslav Ivanov V
Vladyslav V. Ivanov
Continuous loading of an atom beam into an optical lattice
7 pages, 6 figures
Optics Communications 324C (2014), pp. 258-263
10.1016/j.optcom.2014.03.042
10.1016/j.optcom.2014.03.042
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
I propose a method of deceleration and continuous loading of an atom beam into a far-off-resonance optical lattice. The loading of moving atoms into a conservative far-off-resonance potential requires the removal of the atom's excess kinetic energy. Here this is achieved by the Sisyphus cooling method, where a differential lattice-induced ac Stark shift is utilized. The proposed method is described for the case of ytterbium atoms. Numerical simulations demonstrate the possibility of reaching cold and dense samples in a continuous manner on the example of ytterbium atoms.
[ { "created": "Sun, 9 Feb 2014 16:41:41 GMT", "version": "v1" } ]
2015-06-18
[ [ "Ivanov", "Vladyslav V.", "" ] ]
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1402.1963
Thomas White
Thomas White, Alex Robinson, Gianluca Gregori
Using k-alpha emission to determine fast electron spectra using the Hybrid code ZEPHYROS
null
null
null
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A high intensity laser-solid interaction invariably drives a non-thermal fast electron current through the target, however characterizing these fast electron distributions can prove difficult. An understanding of how these electrons propagate through dense materials is of fundamental interest and has applications relevant to fast ignition schemes and ion acceleration. Here, we utilize an upgraded version of the Hybrid code ZEPHYROS to demonstrate how the resulting k-alpha emission from such an interaction can be used as a diagnostic to obtain the characteristic temperature, divergence and total energy of the fast electron population.
[ { "created": "Sun, 9 Feb 2014 16:43:05 GMT", "version": "v1" } ]
2014-02-11
[ [ "White", "Thomas", "" ], [ "Robinson", "Alex", "" ], [ "Gregori", "Gianluca", "" ] ]
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1402.1966
Oleksiy Arkhypov
Oleksiy V. Arkhypov and Helmut O. Rucker
Dispersion-like phenomena in Jovian decametric S-bursts: Tabooed Facts
20 pages, 15 figures
null
null
null
astro-ph.EP physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The dominant viewpoint on Jovian decametric S-burst emission neglects the time delay of the radiation, although its base theory of electron cyclotron maser instability allows a significant decreasing of X-mode group velocity near the cutoff frequency at the bottom of source region. We searched for effects of the frequency-related delay of radiation in broadband Jovian radio storms consisting of periodic S-bursts (S-burst trains) at 16 to 30 MHz. It was found that up to 1% of bursts in a train are of distorted meandering shape in dynamic spectrum, where the emission from one radio source was observed at several frequencies simultaneously. It is difficult to explain such spectra in terms of radio waves beaming or causality without significant frequency-related delay of radio emission. We found experimentally that the frequency drift rate of middle lines of such events coincides with the drift rate of disturbances in common S-bursts. This indicates a general distortion of the dynamic spectrum of S-bursts. As a result, the correlation method for the measurement of the spectral distortion is proposed. Using this method, we found the approximation coefficients for the distortion in 32 spectra of 8 Io-B storms. The corrected spectra formally show that S-burst trains do not move mainly outward from Jupiter, as it is usually assumed, but fly in the opposite direction. Our simulation confirms that the dispersion is capable in principle to reproduce the found spectral distortion. Hence, the dispersion-like phenomena in Jovian S-bursts deserve discussion because they have no satisfactory explanations in terms of traditional approach.
[ { "created": "Sun, 9 Feb 2014 17:16:43 GMT", "version": "v1" } ]
2014-02-11
[ [ "Arkhypov", "Oleksiy V.", "" ], [ "Rucker", "Helmut O.", "" ] ]
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null
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1402.1969
F. Javier Garcia de Abajo
F. Javier Garcia de Abajo
Graphene Plasmonics: Challenges and Opportunities
21 pages, 9 figures, comprehensive and tutorial description of graphene plasmonics, lots of analytical results that are easy to compute, proposed experiments, etc
ACS Photonics 1, 135-152 (2014)
10.1021/ph400147y
null
cond-mat.mes-hall cond-mat.mtrl-sci physics.atm-clus physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Graphene plasmons are rapidly emerging as a viable tool for fast electrical manipulation of light. The prospects for applications to electro-optical modulation, optical sensing, quantum plasmonics, light harvesting, spectral photometry, and tunable lighting at the nanoscale are further stimulated by the relatively low level of losses and high degree of spatial confinement that characterize these excitations compared with conventional plasmonic materials. We start with a general description of the plasmons in extended graphene, followed by analytical methods that lead to reasonably accurate estimates of both the plasmon energies and the strengths of coupling to external light in graphene nanostructures, including graphene ribbons. We discuss several possible strategies to extend these plasmons towards the visible and near infrared, including a reduction in the size of the graphene structures and an increase in the level of doping. Specifically, we discuss plasmons in narrow ribbons and molecular-size graphene structures. We further formulate prescriptions based on geometry to increase the level of electrostatic doping without causing electrical breakdown. Results are also presented for plasmons in highly-doped single-wall carbon nanotubes, which exhibit similar characteristics as narrow ribbons and show a relatively small dependence on the chirality of the tubes. We further discuss perfect light absorption by a single-atom carbon layer, which we illustrate by investigating arrays of ribbons using fully analytical expressions. Finally, we explore the possibility of exploiting optically pumped transient plasmons in graphene, whereby the optically heated graphene valence band can sustain collective plasmon oscillations similar to those of highly doped graphene, and well-defined during the picosecond time window over which the electron is at an elevated temperature.
[ { "created": "Sun, 9 Feb 2014 17:39:54 GMT", "version": "v1" }, { "created": "Wed, 19 Mar 2014 13:44:21 GMT", "version": "v2" } ]
2014-03-20
[ [ "de Abajo", "F. Javier Garcia", "" ] ]
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1402.1971
Mohammed Javed
Mohammed Javed and P. Nagabhushan and B.B. Chaudhuri
Direct Processing of Run Length Compressed Document Image for Segmentation and Characterization of a Specified Block
7 Pages and Published with International Journal of Computer Applications (IJCA)
IJCA 83(15):1-6, December 2013
10.5120/14521-2926
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Extracting a block of interest referred to as segmenting a specified block in an image and studying its characteristics is of general research interest, and could be a challenging if such a segmentation task has to be carried out directly in a compressed image. This is the objective of the present research work. The proposal is to evolve a method which would segment and extract a specified block, and carry out its characterization without decompressing a compressed image, for two major reasons that most of the image archives contain images in compressed format and decompressing an image indents additional computing time and space. Specifically in this research work, the proposal is to work on run-length compressed document images.
[ { "created": "Sun, 9 Feb 2014 18:01:12 GMT", "version": "v1" }, { "created": "Tue, 18 Feb 2014 16:32:16 GMT", "version": "v2" } ]
2014-02-19
[ [ "Javed", "Mohammed", "" ], [ "Nagabhushan", "P.", "" ], [ "Chaudhuri", "B. B.", "" ] ]
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1402.1973
Alhussein Fawzi
Alhussein Fawzi, Mike Davies, Pascal Frossard
Dictionary learning for fast classification based on soft-thresholding
null
null
null
null
cs.CV cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Classifiers based on sparse representations have recently been shown to provide excellent results in many visual recognition and classification tasks. However, the high cost of computing sparse representations at test time is a major obstacle that limits the applicability of these methods in large-scale problems, or in scenarios where computational power is restricted. We consider in this paper a simple yet efficient alternative to sparse coding for feature extraction. We study a classification scheme that applies the soft-thresholding nonlinear mapping in a dictionary, followed by a linear classifier. A novel supervised dictionary learning algorithm tailored for this low complexity classification architecture is proposed. The dictionary learning problem, which jointly learns the dictionary and linear classifier, is cast as a difference of convex (DC) program and solved efficiently with an iterative DC solver. We conduct experiments on several datasets, and show that our learning algorithm that leverages the structure of the classification problem outperforms generic learning procedures. Our simple classifier based on soft-thresholding also competes with the recent sparse coding classifiers, when the dictionary is learned appropriately. The adopted classification scheme further requires less computational time at the testing stage, compared to other classifiers. The proposed scheme shows the potential of the adequately trained soft-thresholding mapping for classification and paves the way towards the development of very efficient classification methods for vision problems.
[ { "created": "Sun, 9 Feb 2014 18:18:33 GMT", "version": "v1" }, { "created": "Thu, 2 Oct 2014 16:45:19 GMT", "version": "v2" } ]
2014-10-03
[ [ "Fawzi", "Alhussein", "" ], [ "Davies", "Mike", "" ], [ "Frossard", "Pascal", "" ] ]
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1402.1974
Rajesh Chauhan Ramjanam
Rajesh R Chauhan, G S Praveen Kumar
A Novel Approach to Detect Spam Worms Propagation with Monitoring the Footprinting
null
International Journal of Computer Trends and Technology (IJCTT) 6(23):3-6, December 2013
null
null
cs.NI cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
One of the key security threats on the Internet are the compromised machines that can be used to launch various security attacks such as spamming and spreading malware, accessing useful information and DDoS. Attackers for spamming activity are volunteer by large number of compromised machines. Our main focus is on detection of the compromised machines in a network that may be or are involved in the spamming activities; these machines are commonly known as spam zombies. Activities such as port scan, DB scan and so on are treated as malicious activity within the network. So to overcome that we develop one of the most effective spam zombie detection system within the network based on the behavior of other systems as if performing the above activities are treated as zombies machines. If any system within the network try's to gather some information about any other system then this is treated as a malicious activity and should be not allowed to do so. SYN packets are used in order to initiate communication within the network so as to establish connection. If any system try's to flood the network with these packets we can make an assumption that the system is trying to gather the information about other system. This is what called footprinting. So we will try to detect any system involved in footprinting and report to the administrator.
[ { "created": "Sun, 9 Feb 2014 18:19:59 GMT", "version": "v1" } ]
2014-02-11
[ [ "Chauhan", "Rajesh R", "" ], [ "Kumar", "G S Praveen", "" ] ]
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1402.1976
Mircea Andrecut Dr
M. Andrecut
Decision Making via AHP
4 pages
null
null
null
stat.ME physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Analytic Hierarchy Process (AHP) is a procedure for establishing priorities in multi-criteria decision making problems. Here we discuss the Logarithmic Least Squares (LLS) method for the AHP and group-AHP, which provides an exact and unique solution for the priority vector. Also, we show that for the group-AHP, the LLS method is equivalent with the minimization of the weighted sum of generalized Kullback-Leibler divergences, between the group-priority vector and the priority vector of each expert.
[ { "created": "Sun, 9 Feb 2014 18:23:51 GMT", "version": "v1" } ]
2014-02-11
[ [ "Andrecut", "M.", "" ] ]
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1402.1978
Radoslaw Klimek
Radoslaw Klimek
A System for Deduction-based Formal Verification of Workflow-oriented Software Models
International Journal of Applied Mathematics and Computer Science
2014, vol. 24, no. 4, pp. 941-956
10.2478/amcs-2014-0069
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The work concerns formal verification of workflow-oriented software models using deductive approach. The formal correctness of a model's behaviour is considered. Manually building logical specifications, which are considered as a set of temporal logic formulas, seems to be the significant obstacle for an inexperienced user when applying the deductive approach. A system, and its architecture, for the deduction-based verification of workflow-oriented models is proposed. The process of inference is based on the semantic tableaux method which has some advantages when compared to traditional deduction strategies. The algorithm for an automatic generation of logical specifications is proposed. The generation procedure is based on the predefined workflow patterns for BPMN, which is a standard and dominant notation for the modeling of business processes. The main idea for the approach is to consider patterns, defined in terms of temporal logic,as a kind of (logical) primitives which enable the transformation of models to temporal logic formulas constituting a logical specification. Automation of the generation process is crucial for bridging the gap between intuitiveness of the deductive reasoning and the difficulty of its practical application in the case when logical specifications are built manually. This approach has gone some way towards supporting, hopefully enhancing our understanding of, the deduction-based formal verification of workflow-oriented models.
[ { "created": "Sun, 9 Feb 2014 19:09:59 GMT", "version": "v1" }, { "created": "Tue, 20 May 2014 06:35:10 GMT", "version": "v2" }, { "created": "Wed, 31 Dec 2014 17:26:19 GMT", "version": "v3" } ]
2015-01-05
[ [ "Klimek", "Radoslaw", "" ] ]
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1402.1985
Radoslaw Klimek
Radoslaw Klimek
Generating Logical Specifications from Requirements Models for Deduction-based Formal Verification
null
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The work concerns automatic generation of logical specifications from requirements models. Logical specifications obtained in such a way can be subjected to formal verification using deductive reasoning. Formal verification concerns correctness of a model behaviour. Reliability of the requirements engineering is essential for all phases of software development processes. Deductive reasoning is an important alternative among other formal methods. However, logical specifications, considered as sets of temporal logic formulas, are difficult to specify manually by inexperienced users and this fact can be regarded as a significant obstacle to practical use of deduction-based verification tools. A method of building requirements models using some UML diagrams, including their logical specifications, is presented step by step. Organizing activity diagrams into predefined workflow patterns enables automated extraction of logical specifications. The crucial aspect of the presented approach is integrating the requirements engineering phase and the automatic generation of logical specifications. A system of the deduction-based verification is proposed. The reasoning process could be based on the semantic tableaux method. A simple yet illustrative example of the requirements elicitation and verification is provided.
[ { "created": "Sun, 9 Feb 2014 20:22:34 GMT", "version": "v1" } ]
2014-02-11
[ [ "Klimek", "Radoslaw", "" ] ]
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1402.1986
Djallel Bouneffouf
Djallel Bouneffouf
Recommandation mobile, sensible au contexte de contenus \'evolutifs: Contextuel-E-Greedy
null
null
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce in this paper an algorithm named Contextuel-E-Greedy that tackles the dynamicity of the user's content. It is based on dynamic exploration/exploitation tradeoff and can adaptively balance the two aspects by deciding which situation is most relevant for exploration or exploitation. The experimental results demonstrate that our algorithm outperforms surveyed algorithms.
[ { "created": "Sun, 9 Feb 2014 20:28:55 GMT", "version": "v1" } ]
2014-02-11
[ [ "Bouneffouf", "Djallel", "" ] ]
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1402.1987
John Taylor
Qi Wang, John E. Taylor
Quantifying Human Mobility Perturbation and Resilience in Natural Disasters
11 pages, 3 figures
null
10.1371/journal.pone.0112608
null
physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Human mobility is influenced by environmental change and natural disasters. Researchers have used trip distance distribution, radius of gyration of movements, and individuals' visited locations to understand and capture human mobility patterns and trajectories. However, our knowledge of human movements during natural disasters is limited owing to both a lack of empirical data and the low precision of available data. Here, we studied human mobility using high-resolution movement data from individuals in New York City during and for several days after Hurricane Sandy in 2012. We found the human movements followed truncated power-law distributions during and after Hurricane Sandy, although the {\beta} value was noticeably larger during the first 24 hours after the storm struck. Also, we examined two parameters: the center of mass and the radius of gyration of each individual's movements. We found that their values during perturbation states and steady states are highly correlated, suggesting human mobility data obtained in steady states can possibly predict the perturbation state. Our results demonstrate that human movement trajectories experienced significant perturbations during hurricanes, but also exhibited high resilience. We expect the study will stimulate future research on the perturbation and inherent resilience of human mobility under the influence of natural disasters. For example, mobility patterns in coastal urban areas could be examined as tropical cyclones approach, gain or dissipate in strength, and as the path of the storm changes. Understanding nuances of human mobility under the influence of disasters will enable more effective evacuation, emergency response planning and development of strategies and policies to reduce fatality, injury, and economic loss.
[ { "created": "Sun, 9 Feb 2014 20:32:24 GMT", "version": "v1" } ]
2015-06-18
[ [ "Wang", "Qi", "" ], [ "Taylor", "John E.", "" ] ]
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1402.1992
Mingmin Chen
Mingmin Chen, Shizhuo Yu, Nico Franz, Shawn Bowers, Bertram Lu\''asher
Euler/X: A Toolkit for Logic-based Taxonomy Integration
8 pages, 14 figures, WFLP 2013
null
null
null
cs.LO cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce Euler/X, a toolkit for logic-based taxonomy integration. Given two taxonomies and a set of alignment constraints between them, Euler/X provides tools for detecting, explaining, and reconciling inconsistencies; finding all possible merges between (consistent) taxonomies; and visualizing merge results. Euler/X employs a number of different underlying reasoning systems, including first-order reasoners (Prover9 and Mace4), answer set programming (DLV and Potassco), and RCC reasoners (PyRCC8). We demonstrate the features of Euler/X and provide experimental results showing its feasibility on various synthetic and real-world examples.
[ { "created": "Sun, 9 Feb 2014 21:13:30 GMT", "version": "v1" } ]
2014-02-11
[ [ "Chen", "Mingmin", "" ], [ "Yu", "Shizhuo", "" ], [ "Franz", "Nico", "" ], [ "Bowers", "Shawn", "" ], [ "Lu\\''asher", "Bertram", "" ] ]
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1402.1997
Jitao Zhang
Jitao Zhang, Wei-Ren Ng, Mingguang Tuo, Min Liang, M.E.Gehm, Hao Xin
Experimental study of a terahertz time-domain spectrometer based on photoconductive antenna
13 pages,8 figures. This paper has been withdrawn by the author due to an supplement of a new result
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physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct a terahertz time-domain spectrometer (THz-TDS) system based on photoconductive antenna (PCA). A 800 nm Ti sapphire femtosecond laser with 80 MHz repetition rate provides the pump and probe laser pulse, which has a 45 fs pulse width (as short as 15 fs is available) and as much as 400 mW power. Two commercial PCAs with 34 um and 6 um gap size are used as the emitter and receiver, respectively. We characterize this system by measuring its absolute radiated THz power, spectral bandwidth, signal-to-noise ratio (SNR), dynamic range and beam profile at the focal plane. We further analyze the noise sources of the THz-TDS system and specifically discuss the possibility to improve the DR and SNR. In addition, using this system, we study the response of the PCA to various parameters, such as laser power, biased voltage, beam spot's location and laser's polarization.
[ { "created": "Sun, 9 Feb 2014 22:00:08 GMT", "version": "v1" }, { "created": "Fri, 14 Feb 2014 15:07:19 GMT", "version": "v2" }, { "created": "Fri, 8 Aug 2014 01:43:42 GMT", "version": "v3" } ]
2014-08-11
[ [ "Zhang", "Jitao", "" ], [ "Ng", "Wei-Ren", "" ], [ "Tuo", "Mingguang", "" ], [ "Liang", "Min", "" ], [ "Gehm", "M. E.", "" ], [ "Xin", "Hao", "" ] ]
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1402.2003
Sorin Matei
Sorin Adam Matei, Nicholas K. Rauh, Eric C. Kansa
A New Approach to Reporting Archaeological Surveys: Connecting Rough Cilicia, Visible Past and Open Context through loose coupling and 3d codes
A previous version of this paper was presented at the 2012 Conference of the Association of Ancient Historians, May 3-5, Chapell Hill, North Carolina
Journal of Data Mining & Digital Humanities, 2014 (June 24, 2014) jdmdh:9
10.46298/jdmdh.9
null
cs.DL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The project presents the strategy adopted by the Rough Cilicia Archaeological Survey team for publishing its primary data and reports via three potentially transformative strategies for digital humanities: Loose coupling of digital data curation and publishing platforms. In loosely coupled systems, components share only a limited set of simple assumptions, which enables systems to evolve dynamically. Collaborative creation of map based narrative content. Connecting print scholarship (book, reports, article) to online resources via two-dimensional barcodes (2D codes) that can be printed on paper and can call up hyperlinks when scanned with a Smartphone. The three strategies are made possible by loosely coupling two autonomous services: Visible Past, dedicated to web collaboration and digital-print publishing and Open Context, which is a geo-historical data archiving and publishing service. The Rough Cilicia Archaeological Survey, Visible Past, and Open Context work together to illustrate a new genre of scholarship, which combine qualitative narratives and quantitative representations of space and social phenomena. The project provides tools for collaborative creation of rich scholarly narratives that are spatially located and for connecting print publications to the digital realm. The project is a case study for utilizing the three new strategies for creating and publishing spatial humanities scholarship more broadly for ancient historians.
[ { "created": "Sun, 9 Feb 2014 23:09:21 GMT", "version": "v1" }, { "created": "Wed, 12 Mar 2014 01:54:29 GMT", "version": "v2" } ]
2023-06-22
[ [ "Matei", "Sorin Adam", "" ], [ "Rauh", "Nicholas K.", "" ], [ "Kansa", "Eric C.", "" ] ]
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1402.2009
Meni Rosenfeld
Meni Rosenfeld
Analysis of Hashrate-Based Double Spending
13 pages
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bitcoin is the world's first decentralized digital currency. Its main technical innovation is the use of a blockchain and hash-based proof of work to synchronize transactions and prevent double-spending the currency. While the qualitative nature of this system is well understood, there is widespread confusion about its quantitative aspects and how they relate to attack vectors and their countermeasures. In this paper we take a look at the stochastic processes underlying typical attacks and their resulting probabilities of success.
[ { "created": "Sun, 9 Feb 2014 23:48:03 GMT", "version": "v1" } ]
2014-02-12
[ [ "Rosenfeld", "Meni", "" ] ]
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1402.2011
Ankit Singh Rawat
Ankit Singh Rawat, Dimitris S. Papailiopoulos, Alexandros G. Dimakis, and Sriram Vishwanath
Locality and Availability in Distributed Storage
Submitted to ISIT 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies the problem of code symbol availability: a code symbol is said to have $(r, t)$-availability if it can be reconstructed from $t$ disjoint groups of other symbols, each of size at most $r$. For example, $3$-replication supports $(1, 2)$-availability as each symbol can be read from its $t= 2$ other (disjoint) replicas, i.e., $r=1$. However, the rate of replication must vanish like $\frac{1}{t+1}$ as the availability increases. This paper shows that it is possible to construct codes that can support a scaling number of parallel reads while keeping the rate to be an arbitrarily high constant. It further shows that this is possible with the minimum distance arbitrarily close to the Singleton bound. This paper also presents a bound demonstrating a trade-off between minimum distance, availability and locality. Our codes match the aforementioned bound and their construction relies on combinatorial objects called resolvable designs. From a practical standpoint, our codes seem useful for distributed storage applications involving hot data, i.e., the information which is frequently accessed by multiple processes in parallel.
[ { "created": "Mon, 10 Feb 2014 00:51:10 GMT", "version": "v1" } ]
2014-02-11
[ [ "Rawat", "Ankit Singh", "" ], [ "Papailiopoulos", "Dimitris S.", "" ], [ "Dimakis", "Alexandros G.", "" ], [ "Vishwanath", "Sriram", "" ] ]
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1402.2013
Xiaohan Liu
Xintong Yu, Xiaohan Liu, Yisong Chen
Foreground segmentation based on multi-resolution and matting
5 pages. 7 figures
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a foreground segmentation algorithm that does foreground extraction under different scales and refines the result by matting. First, the input image is filtered and resampled to 5 different resolutions. Then each of them is segmented by adaptive figure-ground classification and the best segmentation is automatically selected by an evaluation score that maximizes the difference between foreground and background. This segmentation is upsampled to the original size, and a corresponding trimap is built. Closed-form matting is employed to label the boundary region, and the result is refined by a final figure-ground classification. Experiments show the success of our method in treating challenging images with cluttered background and adapting to loose initial bounding-box.
[ { "created": "Mon, 10 Feb 2014 01:22:35 GMT", "version": "v1" } ]
2014-02-12
[ [ "Yu", "Xintong", "" ], [ "Liu", "Xiaohan", "" ], [ "Chen", "Yisong", "" ] ]
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1402.2015
Marija Vucelja
Marija Vucelja, Konstantin S. Turitsyn and Michael Chertkov
Extreme value statistics of work done in stretching a polymer in a gradient flow
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10.1103/PhysRevE.91.022123
null
cond-mat.stat-mech cond-mat.soft physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze the statistics of work generated by a gradient flow to stretch a nonlinear polymer. We obtain the Large Deviation Function (LDF) of the work in the full range of appropriate parameters by combining analytical and numerical tools. The LDF shows two distinct asymptotes: "near tails" are linear in work and dominated by coiled polymer configurations, while "far tails" are quadratic in work and correspond to preferentially fully stretched polymers. We find the extreme value statistics of work for several singular elastic potentials, as well as the mean and the dispersion of work near the coil-stretch transition. The dispersion shows a maximum at the transition.
[ { "created": "Mon, 10 Feb 2014 01:37:28 GMT", "version": "v1" }, { "created": "Fri, 25 Apr 2014 03:19:55 GMT", "version": "v2" }, { "created": "Tue, 23 Dec 2014 04:08:02 GMT", "version": "v3" }, { "created": "Tue, 27 Jan 2015 20:04:16 GMT", "version": "v4" }, { "created": "Wed, 11 Feb 2015 02:20:29 GMT", "version": "v5" } ]
2015-06-18
[ [ "Vucelja", "Marija", "" ], [ "Turitsyn", "Konstantin S.", "" ], [ "Chertkov", "Michael", "" ] ]
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1402.2016
Wenxi Liu
Wenxi Liu, Antoni B. Chan, Rynson W. H. Lau, Dinesh Manocha
Leveraging Long-Term Predictions and Online-Learning in Agent-based Multiple Person Tracking
null
null
10.1109/TCSVT.2014.2344511
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a multiple-person tracking algorithm, based on combining particle filters and RVO, an agent-based crowd model that infers collision-free velocities so as to predict pedestrian's motion. In addition to position and velocity, our tracking algorithm can estimate the internal goals (desired destination or desired velocity) of the tracked pedestrian in an online manner, thus removing the need to specify this information beforehand. Furthermore, we leverage the longer-term predictions of RVO by deriving a higher-order particle filter, which aggregates multiple predictions from different prior time steps. This yields a tracker that can recover from short-term occlusions and spurious noise in the appearance model. Experimental results show that our tracking algorithm is suitable for predicting pedestrians' behaviors online without needing scene priors or hand-annotated goal information, and improves tracking in real-world crowded scenes under low frame rates.
[ { "created": "Mon, 10 Feb 2014 02:07:07 GMT", "version": "v1" }, { "created": "Fri, 7 Mar 2014 16:44:38 GMT", "version": "v2" } ]
2018-10-02
[ [ "Liu", "Wenxi", "" ], [ "Chan", "Antoni B.", "" ], [ "Lau", "Rynson W. H.", "" ], [ "Manocha", "Dinesh", "" ] ]
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1402.2018
Razvan Stefanescu
R\u{a}zvan \c{S}tef\u{a}nescu, Adrian Sandu, and Ionel M. Navon
Comparison of POD reduced order strategies for the nonlinear 2D Shallow Water Equations
23 pages, 8 figures, 5 tables
null
10.1002/fld.3946
TR 2/2014
cs.NA math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper introduces tensorial calculus techniques in the framework of Proper Orthogonal Decomposition (POD) to reduce the computational complexity of the reduced nonlinear terms. The resulting method, named tensorial POD, can be applied to polynomial nonlinearities of any degree $p$. Such nonlinear terms have an on-line complexity of $\mathcal{O}(k^{p+1})$, where $k$ is the dimension of POD basis, and therefore is independent of full space dimension. However it is efficient only for quadratic nonlinear terms since for higher nonlinearities standard POD proves to be less time consuming once the POD basis dimension $k$ is increased. Numerical experiments are carried out with a two dimensional shallow water equation (SWE) test problem to compare the performance of tensorial POD, standard POD, and POD/Discrete Empirical Interpolation Method (DEIM). Numerical results show that tensorial POD decreases by $76\times$ times the computational cost of the on-line stage of standard POD for configurations using more than $300,000$ model variables. The tensorial POD SWE model was only $2-8\times$ slower than the POD/DEIM SWE model but the implementation effort is considerably increased. Tensorial calculus was again employed to construct a new algorithm allowing POD/DEIM shallow water equation model to compute its off-line stage faster than the standard and tensorial POD approaches.
[ { "created": "Mon, 10 Feb 2014 02:20:09 GMT", "version": "v1" } ]
2015-06-18
[ [ "Ştefănescu", "Răzvan", "" ], [ "Sandu", "Adrian", "" ], [ "Navon", "Ionel M.", "" ] ]
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1402.2019
Pedro Hipola
Amed Leiva-Mederos, Jose A. Senso, Sandor Dominguez-Velasco, Pedro Hipola
Authoris: a tool for authority control in the semantic web
27 pages, 8 figures
Library Hi Tech, Vol. 31 Iss: 3, pp.536 - 553
10.1108/LHT-12-20112-0135
null
cs.DL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Purpose: The purpose of this paper is to propose a tool that generates authority files to be integrated with linked data by means of learning rules. AUTHORIS is software developed to enhance authority control and information exchange among bibliographic and non-bibliographic entities. Design / methodology / approach: The article analyzes different methods previously developed for authority control as well as IFLA and ALA standards for managing bibliographic records. Semantic Web technologies are also evaluated. AUTHORIS relies on Drupal and incorporates the protocols of Dublin Core, SIOC, SKOS and FOAF. The tool has also taken into account the obsolescence of MARC and its substitution by FRBR and RDA. Its effectiveness was evaluated applying a learning test proposed by RDA. Over 80 percent of the actions were carried out correctly. Findings: The use of learning rules and the facilities of linked data make it easier for information organizations to reutilize products for authority control and distribute them in a fair and efficient manner. Research limitations / implications: The ISAD-G records were the ones presenting most errors. EAD was found to be second in the number of errors produced. The rest of the formats --MARC 21, Dublin Core, FRAD, RDF, OWL, XBRL and FOAF-- showed fewer than 20 errors in total. Practical implications: AUTHORIS offers institutions the means of sharing data with a high level of stability, helping to detect records that are duplicated and contributing to lexical disambiguation and data enrichment. Originality / value: The software combines the facilities of linked data, the potency of the algorithms for converting bibliographic data, and the precision of learning rules.
[ { "created": "Mon, 10 Feb 2014 02:33:03 GMT", "version": "v1" } ]
2014-02-11
[ [ "Leiva-Mederos", "Amed", "" ], [ "Senso", "Jose A.", "" ], [ "Dominguez-Velasco", "Sandor", "" ], [ "Hipola", "Pedro", "" ] ]
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1402.2020
Kang Zhang
Kang Zhang, Jiyang Li, Yijing Li, Weidong Hu, Lifeng Sun, Shiqiang Yang
Binary Stereo Matching
Pattern Recognition (ICPR), 2012 21st International Conference on
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cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we propose a novel binary-based cost computation and aggregation approach for stereo matching problem. The cost volume is constructed through bitwise operations on a series of binary strings. Then this approach is combined with traditional winner-take-all strategy, resulting in a new local stereo matching algorithm called binary stereo matching (BSM). Since core algorithm of BSM is based on binary and integer computations, it has a higher computational efficiency than previous methods. Experimental results on Middlebury benchmark show that BSM has comparable performance with state-of-the-art local stereo methods in terms of both quality and speed. Furthermore, experiments on images with radiometric differences demonstrate that BSM is more robust than previous methods under these changes, which is common under real illumination.
[ { "created": "Mon, 10 Feb 2014 02:33:39 GMT", "version": "v1" } ]
2014-02-11
[ [ "Zhang", "Kang", "" ], [ "Li", "Jiyang", "" ], [ "Li", "Yijing", "" ], [ "Hu", "Weidong", "" ], [ "Sun", "Lifeng", "" ], [ "Yang", "Shiqiang", "" ] ]
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Binary Stereo Matching
http://arxiv.org/abs/1402.2020v1
http://arxiv.org/pdf/1402.2020v1.pdf
https://github.com/brainless-afk/Binary_Stereo_Matching
false
false
https://paperswithcode.com/paper/binary-stereo-matching
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1402.2022
Pawan Tamta
Pawan Tamta, Bhagwati Prasad Pande, H.S Dhami
Reduction of Maximum Flow Network Interdiction Problem from The Clique Problem
10 pages,3 figures. arXiv admin note: substantial text overlap with arXiv:1312.6492
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cs.DS math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Maximum Flow Network Interdiction Problem (MFNIP) is known to be strongly NP-hard problem. We solve a simple form of MFNIP in polynomial time. We review the reduction of MFNIP from the clique problem. We propose a polynomial time solution to the Clique Problem.
[ { "created": "Mon, 10 Feb 2014 02:48:59 GMT", "version": "v1" } ]
2014-02-11
[ [ "Tamta", "Pawan", "" ], [ "Pande", "Bhagwati Prasad", "" ], [ "Dhami", "H. S", "" ] ]
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1402.2025
Jun Ohkubo
Jun Ohkubo
Nonlinear Kalman filter based on duality relations between continuous and discrete-state stochastic processes
11 pages, 3 figures
Phys. Rev. E 92, 043302 (2015)
10.1103/PhysRevE.92.043302
null
cs.SY cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new application of duality relations of stochastic processes is demonstrated. Although conventional usages of the duality relations need analytical solutions for the dual processes, we here employ numerical solutions of the dual processes and investigate the usefulness. As a demonstration, estimation problems of hidden variables in stochastic differential equations are discussed. Employing algebraic probability theory, a little complicated birth-death process is derived from the stochastic differential equations, and an estimation method based on the ensemble Kalman filter is proposed. As a result, the possibility for making faster computational algorithms based on the duality concepts is shown.
[ { "created": "Mon, 10 Feb 2014 03:22:03 GMT", "version": "v1" }, { "created": "Thu, 24 Sep 2015 00:27:51 GMT", "version": "v2" } ]
2015-10-14
[ [ "Ohkubo", "Jun", "" ] ]
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1402.2029
Oliver Knill
Oliver Knill
Classical mathematical structures within topological graph theory
28 pages
null
null
null
math.GN cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Finite simple graphs are a playground for classical areas of mathematics. We illustrate this by looking at some theorems. These are slightly enhanced preparation notes for a talk given at the joint AMS meeting of January 16, 2014 in Baltimore.
[ { "created": "Mon, 10 Feb 2014 03:54:13 GMT", "version": "v1" } ]
2014-02-11
[ [ "Knill", "Oliver", "" ] ]
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1402.2031
Hong Chang
Wen Wang, Zhen Cui, Hong Chang, Shiguang Shan, Xilin Chen
Deeply Coupled Auto-encoder Networks for Cross-view Classification
11 pages, 3 figures, 3 tables
null
null
null
cs.CV cs.LG cs.NE
http://creativecommons.org/licenses/by/3.0/
The comparison of heterogeneous samples extensively exists in many applications, especially in the task of image classification. In this paper, we propose a simple but effective coupled neural network, called Deeply Coupled Autoencoder Networks (DCAN), which seeks to build two deep neural networks, coupled with each other in every corresponding layers. In DCAN, each deep structure is developed via stacking multiple discriminative coupled auto-encoders, a denoising auto-encoder trained with maximum margin criterion consisting of intra-class compactness and inter-class penalty. This single layer component makes our model simultaneously preserve the local consistency and enhance its discriminative capability. With increasing number of layers, the coupled networks can gradually narrow the gap between the two views. Extensive experiments on cross-view image classification tasks demonstrate the superiority of our method over state-of-the-art methods.
[ { "created": "Mon, 10 Feb 2014 04:15:23 GMT", "version": "v1" } ]
2014-02-11
[ [ "Wang", "Wen", "" ], [ "Cui", "Zhen", "" ], [ "Chang", "Hong", "" ], [ "Shan", "Shiguang", "" ], [ "Chen", "Xilin", "" ] ]
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1402.2032
Farhad Shirani Chaharsooghi
Farhad Shirani, Sandeep Pradhan
An Achievable Rate-Distortion Region for the Multiple Descriptions Problem
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null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A multiple-descriptions (MD) coding strategy is proposed and an inner bound to the achievable rate-distortion region is derived. The scheme utilizes linear codes. It is shown in two different MD set-ups that the linear coding scheme achieves a larger rate-distortion region than previously known random coding strategies. Furthermore, it is shown via an example that the best known random coding scheme for the set-up can be improved by including additional randomly generated codebooks.
[ { "created": "Mon, 10 Feb 2014 04:25:54 GMT", "version": "v1" } ]
2014-02-11
[ [ "Shirani", "Farhad", "" ], [ "Pradhan", "Sandeep", "" ] ]
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1402.2034
Mathilde Bouvel
Michael Albert, Mathilde Bouvel
Operators of equivalent sorting power and related Wilf-equivalences
18 pages, 8 figures
null
null
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study sorting operators $\mathbf{A}$ on permutations that are obtained composing Knuth's stack sorting operator $\mathbf{S}$ and the reversal operator $\mathbf{R}$, as many times as desired. For any such operator $\mathbf{A}$, we provide a size-preserving bijection between the set of permutations sorted by $\mathbf{S} \circ \mathbf{A}$ and the set of those sorted by $\mathbf{S} \circ \mathbf{R} \circ \mathbf{A}$, proving that these sets are enumerated by the same sequence, but also that many classical permutation statistics are equidistributed across these two sets. The description of this family of bijections is based on a bijection between the set of permutations avoiding the pattern $231$ and the set of those avoiding $132$ which preserves many permutation statistics. We also present other properties of this bijection, in particular for finding pairs of Wilf-equivalent permutation classes.
[ { "created": "Mon, 10 Feb 2014 04:43:29 GMT", "version": "v1" } ]
2014-02-11
[ [ "Albert", "Michael", "" ], [ "Bouvel", "Mathilde", "" ] ]
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1402.2037
Tenzing Joshi
T. H. Joshi, S. Sangiorgio, A. Bernstein, M. Foxe, C. Hagmann, I. Jovanovic, K. Kazkaz, V. Mozin, E. B. Norman, S. V. Pereverzev, F. Rebassoo, P. Sorensen
First measurement of the ionization yield of nuclear recoils in liquid argon
4 pages, 4 figures
Phys. Rev. Lett. 112, 171303 (2014)
10.1103/PhysRevLett.112.171303
LLNL-JRNL-646478
physics.ins-det astro-ph.IM nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This Letter details a measurement of the ionization yield ($Q_y$) of 6.7 keV $^{40}Ar$ atoms stopping in a liquid argon detector. The $Q_y$ of 3.6-6.3 detected $e^{-}/\mbox{keV}$, for applied electric fields in the range 240--2130 V/cm, is encouraging for the use of this detector medium to search for the signals from hypothetical dark matter particle interactions and from coherent elastic neutrino nucleus scattering. A significant dependence of $Q_y$ on the applied electric field is observed and explained in the context of ion recombination.
[ { "created": "Mon, 10 Feb 2014 05:06:30 GMT", "version": "v1" }, { "created": "Thu, 1 May 2014 20:39:24 GMT", "version": "v2" } ]
2014-05-05
[ [ "Joshi", "T. H.", "" ], [ "Sangiorgio", "S.", "" ], [ "Bernstein", "A.", "" ], [ "Foxe", "M.", "" ], [ "Hagmann", "C.", "" ], [ "Jovanovic", "I.", "" ], [ "Kazkaz", "K.", "" ], [ "Mozin", "V.", "" ], [ "Norman", "E. B.", "" ], [ "Pereverzev", "S. V.", "" ], [ "Rebassoo", "F.", "" ], [ "Sorensen", "P.", "" ] ]
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1402.2042
Won-Yong Shin
Cheol Jeong and Won-Yong Shin
Ad Hoc Networking With Cost-Effective Infrastructure: Generalized Capacity Scaling
27 pages, 11 figures, Submitted to IEEE/ACM Transactions on Networking
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Capacity scaling of a large hybrid network with unit node density, consisting of $n$ wireless ad hoc nodes, base stations (BSs) equipped with multiple antennas, and one remote central processor (RCP), is analyzed when wired backhaul links between the BSs and the RCP are rate-limited. We deal with a general scenario where the number of BSs, the number of antennas at each BS, and the backhaul link rate can scale at arbitrary rates relative to $n$ (i.e., we introduce three scaling parameters). We first derive the minimum backhaul link rate required to achieve the same capacity scaling law as in the infinite-capacity backhaul link case. Assuming an arbitrary rate scaling of each backhaul link, a generalized achievable throughput scaling law is then analyzed in the network based on using one of pure multihop, hierarchical cooperation, and two infrastructure-supported routing protocols, and moreover, three-dimensional information-theoretic operating regimes are explicitly identified according to the three scaling parameters. In particular, we show the case where our network having a power limitation is also fundamentally in the degrees-of-freedom- or infrastructure-limited regime, or both. In addition, a generalized cut-set upper bound under the network model is derived by cutting not only the wireless connections but also the wired connections. It is shown that our upper bound matches the achievable throughput scaling even under realistic network conditions such that each backhaul link rate scales slower than the aforementioned minimum-required backhaul link rate.
[ { "created": "Mon, 10 Feb 2014 05:42:08 GMT", "version": "v1" }, { "created": "Mon, 28 Jul 2014 07:19:02 GMT", "version": "v2" } ]
2014-07-29
[ [ "Jeong", "Cheol", "" ], [ "Shin", "Won-Yong", "" ] ]
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1402.2043
Gilles Stoltz
Shie Mannor (EE-Technion), Vianney Perchet, Gilles Stoltz (GREGH)
Approachability in unknown games: Online learning meets multi-objective optimization
null
null
null
null
stat.ML cs.LG math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the standard setting of approachability there are two players and a target set. The players play repeatedly a known vector-valued game where the first player wants to have the average vector-valued payoff converge to the target set which the other player tries to exclude it from this set. We revisit this setting in the spirit of online learning and do not assume that the first player knows the game structure: she receives an arbitrary vector-valued reward vector at every round. She wishes to approach the smallest ("best") possible set given the observed average payoffs in hindsight. This extension of the standard setting has implications even when the original target set is not approachable and when it is not obvious which expansion of it should be approached instead. We show that it is impossible, in general, to approach the best target set in hindsight and propose achievable though ambitious alternative goals. We further propose a concrete strategy to approach these goals. Our method does not require projection onto a target set and amounts to switching between scalar regret minimization algorithms that are performed in episodes. Applications to global cost minimization and to approachability under sample path constraints are considered.
[ { "created": "Mon, 10 Feb 2014 05:44:40 GMT", "version": "v1" }, { "created": "Fri, 17 Jun 2016 06:52:49 GMT", "version": "v2" } ]
2016-06-20
[ [ "Mannor", "Shie", "", "EE-Technion" ], [ "Perchet", "Vianney", "", "GREGH" ], [ "Stoltz", "Gilles", "", "GREGH" ] ]
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1402.2044
Gilles Stoltz
Pierre Gaillard (GREGH), Gilles Stoltz (GREGH), Tim Van Erven (INRIA Saclay - Ile de France)
A Second-order Bound with Excess Losses
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null
null
null
stat.ML cs.LG math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study online aggregation of the predictions of experts, and first show new second-order regret bounds in the standard setting, which are obtained via a version of the Prod algorithm (and also a version of the polynomially weighted average algorithm) with multiple learning rates. These bounds are in terms of excess losses, the differences between the instantaneous losses suffered by the algorithm and the ones of a given expert. We then demonstrate the interest of these bounds in the context of experts that report their confidences as a number in the interval [0,1] using a generic reduction to the standard setting. We conclude by two other applications in the standard setting, which improve the known bounds in case of small excess losses and show a bounded regret against i.i.d. sequences of losses.
[ { "created": "Mon, 10 Feb 2014 05:45:29 GMT", "version": "v1" } ]
2014-02-11
[ [ "Gaillard", "Pierre", "", "GREGH" ], [ "Stoltz", "Gilles", "", "GREGH" ], [ "Van Erven", "Tim", "", "INRIA\n Saclay - Ile de France" ] ]
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1402.2055
Leonid Krivitsky
Ivan B. Bobrov, Dmitry A. Kalashnikov, Leonid A. Krivitsky
Imaging of Spatial Correlations of Two-Photon States
9 pages, 7 figures; accepted by Phys Rev A
Phys. Rev. A 89, 043814 (2014)
10.1103/PhysRevA.89.043814
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use a fiber based double slit Young interferometer for studying the far-field spatial distribution of the two-photon coincidence rate (coincidence pattern) for various quantum states with different degree of spatial entanglement. The realized experimental approach allows to characterize coincidence patterns for different states without any modifications of the setup. Measurements were carried out with path-entangled and separable states. The dependence of the coincidence pattern on the phase of the interferometer for superposition and separable states was studied. The results have implications for using of nonclassical light in multiphoton imaging, quantum lithography, and studies of phase decoherence.
[ { "created": "Mon, 10 Feb 2014 07:23:43 GMT", "version": "v1" }, { "created": "Mon, 7 Apr 2014 06:00:23 GMT", "version": "v2" } ]
2015-06-18
[ [ "Bobrov", "Ivan B.", "" ], [ "Kalashnikov", "Dmitry A.", "" ], [ "Krivitsky", "Leonid A.", "" ] ]
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1402.2056
Haipeng Zhang Ph.D.
Tao Feng, Qianqian Wu, Haipeng Zhang
Key parameters generation of the navigation data of GPS Simulator
9 pages, 5 figures, 28 equations, 12 references
International Journal of Soft Computing And Software Engineering (JSCSE), Vol.2,No.10, 2012,Published online: Oct 25, 2012
10.7321/jscse.v2.n10.2
null
cs.IT math.IT
http://creativecommons.org/licenses/by-nc-sa/3.0/
The development of the GPS (Global Positioning System) signal simulator involving to a number of key technologies, in which the generation of navigation message has important significance. Based on analysis of the structure of GPS navigation data, the paper researches the production of telemetry word and handover word, parity check code, time parameters and star clock. Using disturbing force equation and Lagrange planetary motion equation extrapolate ephemeris parameters whose feasibility is verified through the Matlab software finally.
[ { "created": "Mon, 10 Feb 2014 07:27:01 GMT", "version": "v1" } ]
2014-02-11
[ [ "Feng", "Tao", "" ], [ "Wu", "Qianqian", "" ], [ "Zhang", "Haipeng", "" ] ]
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1402.2058
Philipp Hennig PhD
Philipp Hennig
Probabilistic Interpretation of Linear Solvers
final version, in press at SIAM J Optimization
null
null
null
math.OC cs.LG cs.NA math.NA math.PR stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This manuscript proposes a probabilistic framework for algorithms that iteratively solve unconstrained linear problems $Bx = b$ with positive definite $B$ for $x$. The goal is to replace the point estimates returned by existing methods with a Gaussian posterior belief over the elements of the inverse of $B$, which can be used to estimate errors. Recent probabilistic interpretations of the secant family of quasi-Newton optimization algorithms are extended. Combined with properties of the conjugate gradient algorithm, this leads to uncertainty-calibrated methods with very limited cost overhead over conjugate gradients, a self-contained novel interpretation of the quasi-Newton and conjugate gradient algorithms, and a foundation for new nonlinear optimization methods.
[ { "created": "Mon, 10 Feb 2014 07:56:13 GMT", "version": "v1" }, { "created": "Wed, 15 Oct 2014 08:23:52 GMT", "version": "v2" } ]
2014-10-16
[ [ "Hennig", "Philipp", "" ] ]
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1402.2060
Tingbi Yuan
Xiongwei Li, Zhe Wang, Yangting Fu, Zheng Li, Jianming Liu, Weidou Ni
The application of spectrum standardization method for carbon analysis in coal using laser-induced breakdown spectroscopy
Keywords: LIBS; Bituminous coal; Standardization; Quantitative measurement; Precision.11 pages;8 figures
null
null
null
physics.optics cond-mat.mtrl-sci
http://creativecommons.org/licenses/by/3.0/
Measurements of carbon content in coal using laser-induced breakdown spectroscopy (LIBS) is limited by its low measurement precision and accuracy. A spectrum standardization method was proposed to achieve both reproducible and accurate results for the quantitative analysis of carbon content in coal with LIBS. The proposed method utilized the molecular carbon emissions to compensate the diminution of atomic carbon emission caused by matrix effect. The compensated carbon line intensities were further converted into an assumed standard state with fixed plasma temperature, electron density, and total number density of elemental carbon, which is proportional to its concentration in the coal samples. In addition, in order to obtained better compensation for total carbon number density fluctuations, an iterative algorithm was applied, which is different from our previous standardization calculations. The modified spectrum standardization model was applied to the measurement of carbon content in 24 bituminous coal samples. The results demonstrated that the proposed method had superior performance over the generally applied normalization methods. The average relative standard deviation, the coefficient of determination, the root-mean-square error of prediction, and the average maximum relative error for the modified model were 3.44%, 0.83, 2.71%, and 12.61%, respectively, while the corresponding values for the normalization with segmental spectrum area were 6.00%, 0.75, 3.77%, and 15.40%, respectively, showing an overwhelming improvement.
[ { "created": "Mon, 10 Feb 2014 08:05:35 GMT", "version": "v1" } ]
2014-02-11
[ [ "Li", "Xiongwei", "" ], [ "Wang", "Zhe", "" ], [ "Fu", "Yangting", "" ], [ "Li", "Zheng", "" ], [ "Liu", "Jianming", "" ], [ "Ni", "Weidou", "" ] ]
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1402.2062
Tingbi Yuan
Xiongwei Li, Zhe Wang, Yangting Fu, Zheng Li, Weidou Ni
A model combining spectrum standardization and dominant factor based partial least square method for carbon analysis in coal by laser-induced breakdown spectroscopy
Keywords: LIBS; Coal; Standardization; PLS; Quantitative analysis.8 pages;4 figures
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10.1016/j.sab.2014.06.017
null
physics.optics
http://creativecommons.org/licenses/by/3.0/
Successful quantitative measurement of carbon content in coal using laser-induced breakdown spectroscopy (LIBS) is suffered from relatively low precision and accuracy. In the present work, the spectrum standardization method was combined with the dominant factor based partial least square (PLS) method to improve the measurement accuracy of carbon content in coal by LIBS. The combination model employed the spectrum standardization method to convert the carbon line intensity into standard state for more accurately calculating the dominant carbon concentration, and then applied PLS with full spectrum information to correct the residual errors. The combination model was applied to the measurement of carbon content for 24 bituminous coal samples. The results demonstrated that the combination model could further improve the measurement accuracy compared with both our previously established spectrum standardization model and dominant factor based PLS model using spectral area normalized intensity for the dominant factor model. For example, the coefficient of determination (R2), the root-mean-square error of prediction (RMSEP), and the average relative error (ARE) for the combination model were 0.99, 1.75%, and 2.39%, respectively; while those values for the spectrum standardization method were 0.83, 2.71%, and 3.40%, respectively; and those values for the dominant factor based PLS model were 0.99, 2.66%, and 3.64%, respectively.
[ { "created": "Mon, 10 Feb 2014 08:09:49 GMT", "version": "v1" } ]
2015-06-18
[ [ "Li", "Xiongwei", "" ], [ "Wang", "Zhe", "" ], [ "Fu", "Yangting", "" ], [ "Li", "Zheng", "" ], [ "Ni", "Weidou", "" ] ]
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1402.2071
Radim Belohlavek
Radim Belohlavek, Vilem Vychodil
Attribute Dependencies for Data with Grades
null
null
null
null
cs.LO cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper examines attribute dependencies in data that involve grades, such as a grade to which an object is red or a grade to which two objects are similar. We thus extend the classical agenda by allowing graded, or fuzzy, attributes instead of Boolean attributes in case of attribute implications, and allowing approximate match based on degrees of similarity instead of exact match in case of functional dependencies. In a sense, we move from bivalence, inherently present in the now-available theories of dependencies, to a more flexible setting that involves grades. Such a shift has far-reaching consequences. We argue that a reasonable theory of dependencies may be developed by making use of mathematical fuzzy logic. Namely, the theory of dependencies is then based on a solid logic calculus the same way the classical dependencies are based on classical logic. For instance, rather than handling degrees of similarity in an ad hoc manner, we consistently treat them as truth values, the same way as true (match) and false (mismatch) are treated in classical theories. In addition, several notions intuitively embraced in the presence of grades, such as a degree of validity of a particular dependence or a degree of entailment, naturally emerge and receive a conceptually clean treatment in the presented approach. In the paper, we discuss motivations, provide basic notions of syntax and semantics, and develop basic results which include entailment of dependencies, associated closure structures, a logic of dependencies with two versions of completeness theorem, results and algorithms regarding complete non-redundant sets of dependencies, relationship to and a possible reductionist interface to classical dependencies, and relationship to functional dependencies over domains with similarity.
[ { "created": "Mon, 10 Feb 2014 09:08:18 GMT", "version": "v1" } ]
2014-02-11
[ [ "Belohlavek", "Radim", "" ], [ "Vychodil", "Vilem", "" ] ]
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1402.2073
Tobias Kuhn
Tobias Kuhn, Mate Levente Nagy, ThaiBinh Luong, Michael Krauthammer
Mining Images in Biomedical Publications: Detection and Analysis of Gel Diagrams
arXiv admin note: substantial text overlap with arXiv:1209.1481
Journal of Biomedical Semantics 2014, 5:10
10.1186/2041-1480-5-10
null
cs.IR
http://creativecommons.org/licenses/by/3.0/
Authors of biomedical publications use gel images to report experimental results such as protein-protein interactions or protein expressions under different conditions. Gel images offer a concise way to communicate such findings, not all of which need to be explicitly discussed in the article text. This fact together with the abundance of gel images and their shared common patterns makes them prime candidates for automated image mining and parsing. We introduce an approach for the detection of gel images, and present a workflow to analyze them. We are able to detect gel segments and panels at high accuracy, and present preliminary results for the identification of gene names in these images. While we cannot provide a complete solution at this point, we present evidence that this kind of image mining is feasible.
[ { "created": "Mon, 10 Feb 2014 09:16:13 GMT", "version": "v1" } ]
2014-03-06
[ [ "Kuhn", "Tobias", "" ], [ "Nagy", "Mate Levente", "" ], [ "Luong", "ThaiBinh", "" ], [ "Krauthammer", "Michael", "" ] ]
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1402.2078
Victor Atanasov Dr
Victor Atanasov and Rossen Dandoloff
Quantum-elastic bump on a surface
null
Eur. J. Phys. 38 (2017) 015405
10.1088/0143-0807/38/1/015405
null
quant-ph math-ph math.MP physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use an exact solution of the elastic membrane shape equation, representing the curvature, which will serve as a quantum potential in the quantum mechanical two dimensional Schrodinger equation for a (quasi-) particle on the surface of the membrane. Surface curvature in the quasi one-dimensional case is related to an unexpected static formation: on one hand the elastic energy has a maximum where surface curvature has a maximum and on the other hand the concentration of the expectation value to find the (quasi-) particle is again where the elastic energy is concentrated, namely where surface curvature has a maximum. This represents a particular form of a conformon.
[ { "created": "Mon, 10 Feb 2014 09:33:24 GMT", "version": "v1" }, { "created": "Tue, 11 Oct 2016 10:48:11 GMT", "version": "v2" }, { "created": "Tue, 22 Nov 2016 07:05:02 GMT", "version": "v3" } ]
2016-11-23
[ [ "Atanasov", "Victor", "" ], [ "Dandoloff", "Rossen", "" ] ]
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1402.2079
Martin Coleman
Martin A. Coleman
Freedom From Restriction, Freedom Of A Restriction: A Comparison Of Some Open Source Software Licenses
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cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There is a multitude of licenses out there for a software developer to choose from, but a lot of programmers would prefer to not have to have a legal degree in order to understand them and would rather just have their code out in the public being used. This paper examines a few of the more popular and common software licenses available and compares their conditions from the perspective that a developer wanted to scratch their proverbial itch, have their code be used and maybe even get credit for it. This paper attempts to clarify which license a developer would benefit from the most if they just want to have their code used, have their name out there and not be sued if anything breaks.
[ { "created": "Mon, 10 Feb 2014 09:44:34 GMT", "version": "v1" } ]
2014-02-12
[ [ "Coleman", "Martin A.", "" ] ]
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1402.2081
Marta Arcari
M. Arcari, I. S\"ollner, A. Javadi, S. Lindskov Hansen, S. Mahmoodian, J. Liu, H. Thyrrestrup, E. H. Lee, J. D. Song, S. Stobbe, and P. Lodahl
Near-unity coupling efficiency of a quantum emitter to a photonic-crystal waveguide
null
Phys. Rev. Lett. 113, 093603, (2014)
10.1103/PhysRevLett.113.093603
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A quantum emitter efficiently coupled to a nanophotonic waveguide constitutes a promising system for the realization of single-photon transistors, quantum-logic gates based on giant single-photon nonlinearities, and high bit-rate deterministic single-photon sources. The key figure of merit for such devices is the $\beta$-factor, which is the probability for an emitted single photon to be channeled into a desired waveguide mode. We report on the experimental achievement of $\beta = 98.43 \pm 0.04\%$ for a quantum dot coupled to a photonic-crystal waveguide, corresponding to a single-emitter cooperativity of $\eta = 62.7 \pm 1.5$. This constitutes a nearly ideal photon-matter interface where the quantum dot acts effectively as a 1D "artificial" atom, since it interacts almost exclusively with just a single propagating optical mode. The $\beta$-factor is found to be remarkably robust to variations in position and emission wavelength of the quantum dots. Our work demonstrates the extraordinary potential of photonic-crystal waveguides for highly efficient single-photon generation and on-chip photon-photon interaction.
[ { "created": "Mon, 10 Feb 2014 09:57:59 GMT", "version": "v1" }, { "created": "Fri, 6 Jun 2014 07:17:32 GMT", "version": "v2" }, { "created": "Fri, 26 Sep 2014 12:23:25 GMT", "version": "v3" } ]
2014-09-29
[ [ "Arcari", "M.", "" ], [ "Söllner", "I.", "" ], [ "Javadi", "A.", "" ], [ "Hansen", "S. Lindskov", "" ], [ "Mahmoodian", "S.", "" ], [ "Liu", "J.", "" ], [ "Thyrrestrup", "H.", "" ], [ "Lee", "E. H.", "" ], [ "Song", "J. D.", "" ], [ "Stobbe", "S.", "" ], [ "Lodahl", "P.", "" ] ]
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1402.2086
Ian Petersen
Ian R. Petersen
Guaranteed Non-quadratic Performance for Quantum Systems with Nonlinear Uncertainties
A version of this paper is to appear in the Proceedings of the 2014 American Control Conference
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quant-ph cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a robust performance analysis result for a class of uncertain quantum systems containing sector bounded nonlinearities arising from perturbations to the system Hamiltonian. An LMI condition is given for calculating a guaranteed upper bound on a non-quadratic cost function. This result is illustrated with an example involving a Josephson junction in an electromagnetic cavity.
[ { "created": "Mon, 10 Feb 2014 10:20:16 GMT", "version": "v1" } ]
2014-02-11
[ [ "Petersen", "Ian R.", "" ] ]
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1402.2088
Mohammad Tofighi
Mohammad Tofighi, Kivanc Kose, A. Enis Cetin
Signal Reconstruction Framework Based On Projections Onto Epigraph Set Of A Convex Cost Function (PESC)
Submitted to IEEE Transactions on Image Processing on 7th Jan 2014. arXiv admin note: substantial text overlap with arXiv:1309.0700, arXiv:1306.2516
null
null
null
math.OC cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new signal processing framework based on making orthogonal Projections onto the Epigraph Set of a Convex cost function (PESC) is developed. In this way it is possible to solve convex optimization problems using the well-known Projections onto Convex Set (POCS) approach. In this algorithm, the dimension of the minimization problem is lifted by one and a convex set corresponding to the epigraph of the cost function is defined. If the cost function is a convex function in $R^N$, the corresponding epigraph set is also a convex set in R^{N+1}. The PESC method provides globally optimal solutions for total-variation (TV), filtered variation (FV), L_1, L_2, and entropic cost function based convex optimization problems. In this article, the PESC based denoising and compressive sensing algorithms are developed. Simulation examples are presented.
[ { "created": "Mon, 10 Feb 2014 10:25:23 GMT", "version": "v1" } ]
2014-02-11
[ [ "Tofighi", "Mohammad", "" ], [ "Kose", "Kivanc", "" ], [ "Cetin", "A. Enis", "" ] ]
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1402.2090
Piotr Skowron
Piotr Skowron and Krzysztof Rzadca
We Are Impatient: Algorithms for Geographically Distributed Load Balancing with (Almost) Arbitrary Load Functions
null
null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In geographically-distributed systems, communication latencies are non-negligible. The perceived processing time of a request is thus composed of the time needed to route the request to the server and the true processing time. Once a request reaches a target server, the processing time depends on the total load of that server; this dependency is described by a load function. We consider a broad class of load functions; we just require that they are convex and two times differentiable. In particular our model can be applied to heterogeneous systems in which every server has a different load function. This approach allows us not only to generalize results for queuing theory and for batches of requests, but also to use empirically-derived load functions, measured in a system under stress-testing. The optimal assignment of requests to servers is communication-balanced, i.e. for any pair of non perfectly-balanced servers, the reduction of processing time resulting from moving a single request from the overloaded to underloaded server is smaller than the additional communication latency. We present a centralized and a decentralized algorithm for optimal load balancing. We prove bounds on the algorithms' convergence. To the best of our knowledge these bounds were not known even for the special cases studied previously (queuing theory and batches of requests). Both algorithms are any-time algorithms. In the decentralized algorithm, each server balances the load with a randomly chosen peer. Such algorithm is very robust to failures. We prove that the decentralized algorithm performs locally-optimal steps. Our work extends the currently known results by considering a broad class of load functions and by establishing theoretical bounds on the algorithms' convergence. These results are applicable for servers whose characteristics under load cannot be described by a standard mathematical models.
[ { "created": "Mon, 10 Feb 2014 10:33:52 GMT", "version": "v1" } ]
2014-02-11
[ [ "Skowron", "Piotr", "" ], [ "Rzadca", "Krzysztof", "" ] ]
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1402.2091
Yi Hong Dr
Shuiyin Liu, Yi Hong, Emanuele Viterbo
Artificial Noise Revisited
4 figures, submitted to IEEE Trans on Wireless Commun
null
10.1109/TIT.2015.2437882
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The artificial noise (AN) scheme, proposed by Goel and Negi, is being considered as one of the key enabling technology for secure communications over multiple-input multiple-output (MIMO) wiretap channels. However, the decrease in secrecy rate due to the increase in the number of Eve's antennas is not well understood. In this paper, we develop an analytical framework to characterize the secrecy rate of the AN scheme as a function of Eve's signal-to-noise ratio (SNR), Bob's SNR, the number of antennas in each terminal, and the power allocation scheme. We first derive a closed-form expression for the average secrecy rate. We then derive a closed-form expression for the asymptotic instantaneous secrecy rate with large number of antennas at all terminals. Finally, we derive simple lower and upper bounds on the average and instantaneous secrecy rate that provide a tool for the system design.
[ { "created": "Mon, 10 Feb 2014 10:35:49 GMT", "version": "v1" } ]
2016-11-17
[ [ "Liu", "Shuiyin", "" ], [ "Hong", "Yi", "" ], [ "Viterbo", "Emanuele", "" ] ]
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1402.2092
Adish Singla
Adish Singla, Ilija Bogunovic, G\'abor Bart\'ok, Amin Karbasi, and Andreas Krause
Near-Optimally Teaching the Crowd to Classify
null
null
null
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
How should we present training examples to learners to teach them classification rules? This is a natural problem when training workers for crowdsourcing labeling tasks, and is also motivated by challenges in data-driven online education. We propose a natural stochastic model of the learners, modeling them as randomly switching among hypotheses based on observed feedback. We then develop STRICT, an efficient algorithm for selecting examples to teach to workers. Our solution greedily maximizes a submodular surrogate objective function in order to select examples to show to the learners. We prove that our strategy is competitive with the optimal teaching policy. Moreover, for the special case of linear separators, we prove that an exponential reduction in error probability can be achieved. Our experiments on simulated workers as well as three real image annotation tasks on Amazon Mechanical Turk show the effectiveness of our teaching algorithm.
[ { "created": "Mon, 10 Feb 2014 10:36:49 GMT", "version": "v1" }, { "created": "Tue, 11 Feb 2014 11:24:42 GMT", "version": "v2" }, { "created": "Thu, 20 Feb 2014 12:25:01 GMT", "version": "v3" }, { "created": "Fri, 7 Mar 2014 19:38:37 GMT", "version": "v4" } ]
2014-03-10
[ [ "Singla", "Adish", "" ], [ "Bogunovic", "Ilija", "" ], [ "Bartók", "Gábor", "" ], [ "Karbasi", "Amin", "" ], [ "Krause", "Andreas", "" ] ]
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1402.2095
Marco Nava
Marco Nava, Michele Ceriotti, Chaim Dryzun and Michele Parrinello
Evaluating functions of positive-definite matrices using colored noise thermostats
8 pages, 4 figures
Phys. Rev. E 89, 023302 (2014)
10.1103/PhysRevE.89.023302
null
physics.comp-ph cond-mat.stat-mech physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many applications in computational science require computing the elements of a function of a large matrix. A commonly used approach is based on the the evaluation of the eigenvalue decomposition, a task that, in general, involves a computing time that scales with the cube of the size of the matrix. We present here a method that can be used to evaluate the elements of a function of a positive-definite matrix with a scaling that is linear for sparse matrices and quadratic in the general case. This methodology is based on the properties of the dynamics of a multidimensional harmonic potential coupled with colored noise generalized Langevin equation (GLE) thermostats. This "$f-$thermostat" (FTH) approach allows us to calculate directly elements of functions of a positive-definite matrix by carefully tailoring the properties of the stochastic dynamics. We demonstrate the scaling and the accuracy of this approach for both dense and sparse problems and compare the results with other established methodologies.
[ { "created": "Mon, 10 Feb 2014 10:47:00 GMT", "version": "v1" } ]
2014-07-04
[ [ "Nava", "Marco", "" ], [ "Ceriotti", "Michele", "" ], [ "Dryzun", "Chaim", "" ], [ "Parrinello", "Michele", "" ] ]
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1402.2097
Avivit Levy
Gary Benson and Avivit Levy and Riva Shalom
Longest Common Subsequence in k-length substrings
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we define a new problem, motivated by computational biology, $LCSk$ aiming at finding the maximal number of $k$ length $substrings$, matching in both input strings while preserving their order of appearance. The traditional LCS definition is a special case of our problem, where $k = 1$. We provide an algorithm, solving the general case in $O(n^2)$ time, where $n$ is the length of the input strings, equaling the time required for the special case of $k=1$. The space requirement of the algorithm is $O(kn)$. %, however, in order to enable %backtracking of the solution, $O(n^2)$ space is needed. We also define a complementary $EDk$ distance measure and show that $EDk(A,B)$ can be computed in $O(nm)$ time and $O(km)$ space, where $m$, $n$ are the lengths of the input sequences $A$ and $B$ respectively.
[ { "created": "Mon, 10 Feb 2014 10:54:52 GMT", "version": "v1" } ]
2014-02-11
[ [ "Benson", "Gary", "" ], [ "Levy", "Avivit", "" ], [ "Shalom", "Riva", "" ] ]
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Longest Common Subsequence in k-length substrings
https://arxiv.org/abs/1402.2097v1
https://arxiv.org/pdf/1402.2097v1.pdf
https://github.com/fpavetic/lcskpp
false
false
https://paperswithcode.com/paper/longest-common-subsequence-in-k-length
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1402.2102
Filip Konecny
Filip Konecny
PTIME Computation of Transitive Closures of Octagonal Relations
null
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Computing transitive closures of integer relations is the key to finding precise invariants of integer programs. In this paper, we study difference bounds and octagonal relations and prove that their transitive closure is a PTIME-computable formula in the existential fragment of Presburger arithmetic. This result marks a significant complexity improvement, as the known algorithms have EXPTIME worst case complexity.
[ { "created": "Mon, 10 Feb 2014 11:04:39 GMT", "version": "v1" } ]
2016-04-05
[ [ "Konecny", "Filip", "" ] ]
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1402.2107
Mario Pastorelli
Mario Pastorelli, Matteo Dell'Amico, Pietro Michiardi
OS-Assisted Task Preemption for Hadoop
null
null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work introduces a new task preemption primitive for Hadoop, that allows tasks to be suspended and resumed exploiting existing memory management mechanisms readily available in modern operating systems. Our technique fills the gap that exists between the two extremes cases of killing tasks (which waste work) or waiting for their completion (which introduces latency): experimental results indicate superior performance and very small overheads when compared to existing alternatives.
[ { "created": "Mon, 10 Feb 2014 11:14:19 GMT", "version": "v1" } ]
2014-02-11
[ [ "Pastorelli", "Mario", "" ], [ "Dell'Amico", "Matteo", "" ], [ "Michiardi", "Pietro", "" ] ]
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1402.2108
Uttam Ghosh
Waleed S. Alnumay and Uttam Ghosh
Secure Routing and Data Transmission in Mobile Ad Hoc Networks
null
International Journal of Computer Networks & Communications (IJCNC) Vol.6, No.1, January 2014
null
null
cs.NI cs.CR
http://creativecommons.org/licenses/by/3.0/
In this paper, we present an identity (ID) based protocol that secures AODV and TCP so that it can be used in dynamic and attack prone environments of mobile ad hoc networks. The proposed protocol protects AODV using Sequential Aggregate Signatures (SAS) based on RSA. It also generates a session key for each pair of source-destination nodes of a MANET for securing the end-to-end transmitted data. Here each node has an ID which is evaluated from its public key and the messages that are sent are authenticated with a signature/ MAC. The proposed scheme does not allow a node to change its ID throughout the network lifetime. Thus it makes the network secure against attacks that target AODV and TCP in MANET. We present performance analysis to validate our claim.
[ { "created": "Mon, 10 Feb 2014 11:17:18 GMT", "version": "v1" } ]
2014-02-11
[ [ "Alnumay", "Waleed S.", "" ], [ "Ghosh", "Uttam", "" ] ]
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1402.2110
Smitha Pai N
Smitha N. Pai, K.C. Shet and H.S Mruthyunjaya
In-network Aggregation using Efficient Routing Techniques for Event Driven Sensor Network
20 pages 16 figures, 7 tables
International Journal of Computer Networks & Communications (IJCNC) Vol.6, No.1, January 2014
10.5121/ijcnc.2014.6110
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Sensors used in applications such as agriculture, weather, etc., monitoring physical parameters like soil moisture, temperature, humidity, will have to sustain their battery power for long intervals of time. In order to accomplish this, parameter which assists in reducing the consumption of power from battery need to be attended to. One of the factors affecting the consumption of energy is transmit and receive power. This energy consumption can be reduced by avoiding unnecessary transmission and reception. Efficient routing techniques and incorporating aggregation whenever possible can save considerable amount of energy. Aggregation reduces repeated transmission of relative values and also reduces lot of computation at the base station. In this paper, the benefits of aggregation over direct transmission in saving the amount of energy consumed is discussed. Routing techniques which assist aggregation are incorporated. Aspects like transmission of average value of sensed data around an area of the network, minimum value in the whole of the network, triggering of event when there is low battery are assimilated.
[ { "created": "Mon, 10 Feb 2014 11:21:41 GMT", "version": "v1" } ]
2014-02-11
[ [ "Pai", "Smitha N.", "" ], [ "Shet", "K. C.", "" ], [ "Mruthyunjaya", "H. S", "" ] ]
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1402.2114
Shiu Kumar
Shiu Kumar
Ubiquitous Smart Home System Using Android Application
11 pages, 10 figures
International Journal of Computer Networks & Communications, vol. 6(1), pp. 33-43, 2014
10.5121/ijcnc.2014.6103
null
cs.CY cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a flexible standalone, low-cost smart home system, which is based on the Android app communicating with the micro-web server providing more than the switching functionalities. The Arduino Ethernet is used to eliminate the use of a personal computer (PC) keeping the cost of the overall system to a minimum while voice activation is incorporated for switching functionalities. Devices such as light switches, power plugs, temperature sensors, humidity sensors, current sensors, intrusion detection sensors, smoke/gas sensors and sirens have been integrated in the system to demonstrate the feasibility and effectiveness of the proposed smart home system. The smart home app is tested and it is able to successfully perform the smart home operations such as switching functionalities, automatic environmental control and intrusion detection, in the later case where an email is generated and the siren goes on.
[ { "created": "Mon, 10 Feb 2014 11:30:06 GMT", "version": "v1" } ]
2014-02-11
[ [ "Kumar", "Shiu", "" ] ]
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1402.2126
Igor Lesanovsky
Igor Lesanovsky and Juan P. Garrahan
Out-of-equilibrium structures in strongly interacting Rydberg gases with dissipation
null
Phys. Rev. A 90, 011603 (2014)
10.1103/PhysRevA.90.011603
null
cond-mat.quant-gas cond-mat.stat-mech physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The non-equilibrium dynamics of a gas of cold atoms in which Rydberg states are off-resonantly excited is studied in the presence of noise. The interplay between interaction and off-resonant excitation leads to an initial dynamics where aggregates of excited Rydberg atoms slowly nucleate and grow, eventually reaching long-lived meta-stable arrangements which then relax further on much longer timescales. This growth dynamics is governed by an effective Master equation which permits a transparent and largely analytical understanding of the underlying physics. By means of extensive numerical simulations we study the many-body dynamics and the correlations of the resulting non-equilibrium states in various dimensions. Our results provide insight into the dynamical richness of strongly interacting Rydberg gases in noisy environments, and highlight the usefulness of these kind of systems for the exploration of soft-matter-type collective behaviour.
[ { "created": "Mon, 10 Feb 2014 12:29:26 GMT", "version": "v1" } ]
2014-07-23
[ [ "Lesanovsky", "Igor", "" ], [ "Garrahan", "Juan P.", "" ] ]
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1402.2127
Radu Iosif
Radu Iosif and Adam Rogalewicz and Tomas Vojnar
Deciding Entailments in Inductive Separation Logic with Tree Automata
null
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Separation Logic (SL) with inductive definitions is a natural formalism for specifying complex recursive data structures, used in compositional verification of programs manipulating such structures. The key ingredient of any automated verification procedure based on SL is the decidability of the entailment problem. In this work, we reduce the entailment problem for a non-trivial subset of SL describing trees (and beyond) to the language inclusion of tree automata (TA). Our reduction provides tight complexity bounds for the problem and shows that entailment in our fragment is EXPTIME-complete. For practical purposes, we leverage from recent advances in automata theory, such as inclusion checking for non-deterministic TA avoiding explicit determinization. We implemented our method and present promising preliminary experimental results.
[ { "created": "Mon, 10 Feb 2014 12:31:58 GMT", "version": "v1" }, { "created": "Tue, 11 Feb 2014 09:35:07 GMT", "version": "v2" } ]
2014-02-12
[ [ "Iosif", "Radu", "" ], [ "Rogalewicz", "Adam", "" ], [ "Vojnar", "Tomas", "" ] ]
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1402.2135
Martin Milani\v{c}
Flavia Bonomo, Luciano N. Grippo, Martin Milani\v{c}, Mart\'in D. Safe
Graph classes with and without powers of bounded clique-width
23 pages, 4 figures
Discrete Applied Mathematics 199 (2016): 3-15
10.1016/j.dam.2015.06.010
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We initiate the study of graph classes of power-bounded clique-width, that is, graph classes for which there exist integers $k$ and $\ell$ such that the $k$-th powers of the graphs are of clique-width at most $\ell$. We give sufficient and necessary conditions for this property. As our main results, we characterize graph classes of power-bounded clique-width within classes defined by either one forbidden induced subgraph, or by two connected forbidden induced subgraphs. We also show that for every positive integer $k$, there exists a graph class such that the $k$-th powers of graphs in the class form a class of bounded clique-width, while this is not the case for any smaller power.
[ { "created": "Mon, 10 Feb 2014 13:24:20 GMT", "version": "v1" }, { "created": "Sun, 10 May 2015 10:27:19 GMT", "version": "v2" } ]
2023-04-04
[ [ "Bonomo", "Flavia", "" ], [ "Grippo", "Luciano N.", "" ], [ "Milanič", "Martin", "" ], [ "Safe", "Martín D.", "" ] ]
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1402.2136
Leo van Iersel
Leo van Iersel, Steven Kelk, Nela Leki\'c, Chris Whidden and Norbert Zeh
Hybridization Number on Three Rooted Binary Trees is EPT
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Phylogenetic networks are leaf-labelled directed acyclic graphs that are used to describe non-treelike evolutionary histories and are thus a generalization of phylogenetic trees. The hybridization number of a phylogenetic network is the sum of all indegrees minus the number of nodes plus one. The Hybridization Number problem takes as input a collection of phylogenetic trees and asks to construct a phylogenetic network that contains an embedding of each of the input trees and has a smallest possible hybridization number. We present an algorithm for the Hybridization Number problem on three binary trees on $n$ leaves, which runs in time $O(c^k poly(n))$, with $k$ the hybridization number of an optimal network and $c$ a constant. For two trees, an algorithm with running time $O(3.18^k n)$ was proposed before whereas an algorithm with running time $O(c^k poly(n))$ had prior to this article remained elusive for more than two trees. The algorithm for two trees uses the close connection to acyclic agreement forests to achieve a linear exponent in the running time, while previous algorithms for more than two trees (explicitly or implicitly) relied on a brute force search through all possible underlying network topologies, leading to running times that are not $O(c^k poly(n))$ for any $c$. The connection to acyclic agreement forests is much weaker for more than two trees, so even given the right agreement forest, reconstructing the network poses major challenges. We prove novel structural results that allow us to reconstruct a network without having to guess the underlying topology. Our techniques generalize to more than three input trees with the exception of one key lemma that maps nodes in the network to tree nodes and, thus, minimizes the amount of guessing involved in constructing the network. The main open problem therefore is to establish a similar mapping for more than three trees.
[ { "created": "Mon, 10 Feb 2014 13:24:51 GMT", "version": "v1" }, { "created": "Thu, 1 May 2014 11:56:42 GMT", "version": "v2" }, { "created": "Tue, 31 May 2016 08:11:31 GMT", "version": "v3" } ]
2016-06-01
[ [ "van Iersel", "Leo", "" ], [ "Kelk", "Steven", "" ], [ "Lekić", "Nela", "" ], [ "Whidden", "Chris", "" ], [ "Zeh", "Norbert", "" ] ]
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1402.2137
Gregory Gutin
Gregory Gutin, Mark Jones, Bin Sheng and Magnus Wahlstrom
Parameterized Directed $k$-Chinese Postman Problem and $k$ Arc-Disjoint Cycles Problem on Euler Digraphs
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cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the Directed $k$-Chinese Postman Problem ($k$-DCPP), we are given a connected weighted digraph $G$ and asked to find $k$ non-empty closed directed walks covering all arcs of $G$ such that the total weight of the walks is minimum. Gutin, Muciaccia and Yeo (Theor. Comput. Sci. 513 (2013) 124--128) asked for the parameterized complexity of $k$-DCPP when $k$ is the parameter. We prove that the $k$-DCPP is fixed-parameter tractable. We also consider a related problem of finding $k$ arc-disjoint directed cycles in an Euler digraph, parameterized by $k$. Slivkins (ESA 2003) showed that this problem is W[1]-hard for general digraphs. Generalizing another result by Slivkins, we prove that the problem is fixed-parameter tractable for Euler digraphs. The corresponding problem on vertex-disjoint cycles in Euler digraphs remains W[1]-hard even for Euler digraphs.
[ { "created": "Mon, 10 Feb 2014 13:25:18 GMT", "version": "v1" } ]
2014-02-11
[ [ "Gutin", "Gregory", "" ], [ "Jones", "Mark", "" ], [ "Sheng", "Bin", "" ], [ "Wahlstrom", "Magnus", "" ] ]
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1402.2140
Aybars Ural
Vedat Kavalci, Aybars Ural and Orhan Dagdeviren
Distributed Vertex Cover Algorithms For Wireless Sensor Networks
null
International Journal of Computer Networks & Communications (IJCNC) Vol.6, No.1, January 2014
10.5121/ijcnc.2014.6107
null
cs.DC cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Vertex covering has important applications for wireless sensor networks such as monitoring link failures, facility location, clustering, and data aggregation. In this study, we designed three algorithms for constructing vertex cover in wireless sensor networks. The first algorithm, which is an adaption of the Parnas & Ron's algorithm, is a greedy approach that finds a vertex cover by using the degrees of the nodes. The second algorithm finds a vertex cover from graph matching where Hoepman's weighted matching algorithm is used. The third algorithm firstly forms a breadth-first search tree and then constructs a vertex cover by selecting nodes with predefined levels from breadth-first tree. We show the operation of the designed algorithms, analyze them, and provide the simulation results in the TOSSIM environment. Finally we have implemented, compared and assessed all these approaches. The transmitted message count of the first algorithm is smallest among other algorithms where the third algorithm has turned out to be presenting the best results in vertex cover approximation ratio.
[ { "created": "Mon, 10 Feb 2014 13:30:25 GMT", "version": "v1" } ]
2014-02-11
[ [ "Kavalci", "Vedat", "" ], [ "Ural", "Aybars", "" ], [ "Dagdeviren", "Orhan", "" ] ]
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1402.2143
Uli Fahrenberg
Uli Fahrenberg and Axel Legay and Louis-Marie Traonouez
Structural Refinement for the Modal nu-Calculus
Accepted at ICTAC 2014
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a new notion of structural refinement, a sound abstraction of logical implication, for the modal nu-calculus. Using new translations between the modal nu-calculus and disjunctive modal transition systems, we show that these two specification formalisms are structurally equivalent. Using our translations, we also transfer the structural operations of composition and quotient from disjunctive modal transition systems to the modal nu-calculus. This shows that the modal nu-calculus supports composition and decomposition of specifications.
[ { "created": "Mon, 10 Feb 2014 13:46:55 GMT", "version": "v1" }, { "created": "Tue, 10 Jun 2014 12:53:50 GMT", "version": "v2" } ]
2014-06-11
[ [ "Fahrenberg", "Uli", "" ], [ "Legay", "Axel", "" ], [ "Traonouez", "Louis-Marie", "" ] ]
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1402.2144
Mohammed Abufouda
Mohammed Abufouda
A Framework for Enhancing Performance and Handling Run-Time Uncertainty in Self-Adaptive Systems
null
International Journal of Software Engineering & Applications (IJSEA), Vol.5, No.1, January 2014
10.5121/ijsea.2014.5106
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Self-adaptivity allows software systems to autonomously adjust their behavior during run-time to reduce the cost complexities caused by manual maintenance. In this paper, a framework for building an external adaptation engine for self-adaptive software systems is proposed. In order to improve the quality of self-adaptive software systems, this research addresses two challenges in self-adaptive software systems. The first challenge is to provide better performance of the adaptation engine by managing the complexity of the adaptation space efficiently and the second challenge is handling run-time uncertainty that hinders the adaptation process. This research utilizes Case-based Reasoning as an adaptation engine along with utility functions for realizing the managed system's requirements.
[ { "created": "Mon, 10 Feb 2014 13:49:53 GMT", "version": "v1" } ]
2014-02-11
[ [ "Abufouda", "Mohammed", "" ] ]
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1402.2145
Niloofar Rastin
Niloofar Rastin and Mansoor Zolghadri Jahromi
Using content features to enhance performance of user-based collaborative filtering performance of user-based collaborative filtering
10 pages, journal
International journal of artificial intelligence and applications, vol. 5, no. 1, pp. 53-62, January 2014
null
null
cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Content-based and collaborative filtering methods are the most successful solutions in recommender systems. Content based method is based on items attributes. This method checks the features of users favourite items and then proposes the items which have the most similar characteristics with those items. Collaborative filtering method is based on the determination of similar items or similar users, which are called item-based and user-based collaborative filtering, respectively.In this paper we propose a hybrid method that integrates collaborative filtering and content-based methods. The proposed method can be viewed as user-based Collaborative filtering technique. However to find users with similar taste with active user, we used content features of the item under investigation to put more emphasis on users rating for similar items. In other words two users are similar if their ratings are similar on items that have similar context. This is achieved by assigning a weight to each rating when calculating the similarity of two users.We used movielens data set to access the performance of the proposed method in comparison with basic user-based collaborative filtering and other popular methods.
[ { "created": "Mon, 10 Feb 2014 13:52:33 GMT", "version": "v1" }, { "created": "Thu, 13 Feb 2014 12:16:22 GMT", "version": "v2" } ]
2014-02-14
[ [ "Rastin", "Niloofar", "" ], [ "Jahromi", "Mansoor Zolghadri", "" ] ]
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1402.2149
Ben Khayut Z
Ben Khayut, Lina Fabri and Maya Abukhana
Intelligent User Interface in Fuzzy Environment
15 pages, 4 figures
International Journal of Artificial Intelligence & Applications (IJAIA), Vol. 5, No. 1, January 2014, pp. 63-78
null
null
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Human-Computer Interaction with the traditional User Interface is done using a specified in advance script dialog menu, mainly based on human intellect and unproductive use of navigation. This approach does not lead to making qualitative decision in control systems, where the situations and processes cannot be structured in advance. Any dynamic changes in the controlled business process (as example, in organizational unit of the information fuzzy control system) make it necessary to modify the script dialogue in User Interface. This circumstance leads to a redesign of the components of the User Interface and of the entire control system. In the Intelligent User Interface, where the dialog situations are unknown in advance, fuzzy structured and artificial intelligence is crucial, the redesign described above is impossible. To solve this and other problems, we propose the data, information and knowledge based technology of Smart/ Intelligent User Interface (IUI) design, which interacts with users and systems in natural and other languages, utilizing the principles of Situational Control and Fuzzy Logic theories, Artificial Intelligence, Linguistics, Knowledge Base technologies and others. The proposed technology of IUI design is defined by multi-agents of Situational Control and of data, information and knowledge, modelling of Fuzzy Logic Inference, Generalization, Representation and Explanation of knowledge, Planning and Decision-making, Dialog Control, Reasoning and Systems Thinking, Fuzzy Control of organizational unit in real-time, fuzzy conditions, heterogeneous domains, and multi-lingual communication under uncertainty and in Fuzzy Environment.
[ { "created": "Mon, 10 Feb 2014 14:00:56 GMT", "version": "v1" } ]
2014-02-11
[ [ "Khayut", "Ben", "" ], [ "Fabri", "Lina", "" ], [ "Abukhana", "Maya", "" ] ]
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1402.2150
Simen A Adnoy Ellingsen
Simen {\AA} Ellingsen, Per-{\AA}ge Krogstad
Nonextensive statistical dynamics applied to wall turbulence
10 pages, 5 figures; contribution to Festschrift dedicated to Prof. Johan S. H{\o}ye
null
null
null
physics.flu-dyn nlin.CD physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We apply a formalism of nonextensive statistical mechanics to experimental wall turbulence data, for the first time to our knowledge. Wind tunnel data for velocity differences a streamwise distance $r$ apart are compared to the prediction from theory as developed by Beck. The simplest theory, in which all free parameters are removed, is found to reproduce statistics for the wall-normal velocity component remarkably well, even for $r$ well beyond the corresponding integral scale, while the corresponding description of the streamwise velocity fluctuations is reasonable at separations below the integral scale. A least-squares 2-parameter fit is performed, and the dependence of the optimum parameter values on wall separation and $r$ is analysed. Both parameters are found to be approximately independent of wall-separation in the logarithmic sub-layer.
[ { "created": "Mon, 10 Feb 2014 14:03:03 GMT", "version": "v1" } ]
2014-02-11
[ [ "Ellingsen", "Simen Å", "" ], [ "Krogstad", "Per-Åge", "" ] ]
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1402.2151
Lionel Gil
L. Gil, G. L. Lippi
Phase Instability as a Source of Modal Dynamics in Semiconductor Lasers
null
Phys. Rev. Lett. 113, 213902 (2014)
10.1103/PhysRevLett.113.213902
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Thanks to a new derivation of the fundamental equations governing multimode dynamics for a semiconductor laser near its threshold, we identify regimes of existence of a pure phase instability (and of a mixed phase-amplitude turbulence regime) which give an alternative satisfactory interpre- tation of the deterministic multimode dynamics observed in some devices. The existence of intrinsic noise generated by the phase instability reconciles in the same description the deterministic and random features of the semiconductor dynamics.
[ { "created": "Mon, 10 Feb 2014 14:03:14 GMT", "version": "v1" } ]
2014-11-26
[ [ "Gil", "L.", "" ], [ "Lippi", "G. L.", "" ] ]
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1402.2153
Sparisoma Viridi
Mitra Djamal, Irfa Aji Prayogi, Kazuhide Watanabe, Akihiro Takita, Yusaku Fujii, Sparisoma Viridi
Measuring Quasi-Static and Kinetic Coefficient of Restitution Simultaneously using Levitation Mass Method: Experiment and Simulation
10 pages, 7 figures
null
null
null
physics.ins-det
http://creativecommons.org/licenses/by-nc-sa/3.0/
Observed peaks in a levitation mass method (LMM), which are usually addressed to signal noise, are discussed in this work. This phenomenon arises due to bounce from plate which is collided by moving part in LMM measurement system. Normally, the moving part and the plate stick very good after their first contact. Simulation using molecular dynamics (MD) method is performed to prove the bounce prognosis.
[ { "created": "Mon, 10 Feb 2014 14:11:00 GMT", "version": "v1" } ]
2014-02-11
[ [ "Djamal", "Mitra", "" ], [ "Prayogi", "Irfa Aji", "" ], [ "Watanabe", "Kazuhide", "" ], [ "Takita", "Akihiro", "" ], [ "Fujii", "Yusaku", "" ], [ "Viridi", "Sparisoma", "" ] ]
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1402.2169
Nabin Malakar
N. K. Malakar, A. J. Mesiti, K. H. Knuth
The Spatial Sensitivity Function of a Light Sensor
Published in MaxEnt 2009
null
null
null
astro-ph.IM physics.data-an stat.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Spatial Sensitivity Function (SSF) is used to quantify a detector's sensitivity to a spatially-distributed input signal. By weighting the incoming signal with the SSF and integrating, the overall scalar response of the detector can be estimated. This project focuses on estimating the SSF of a light intensity sensor consisting of a photodiode. This light sensor has been used previously in the Knuth Cyberphysics Laboratory on a robotic arm that performs its own experiments to locate a white circle in a dark field (Knuth et al., 2007). To use the light sensor to learn about its surroundings, the robot's inference software must be able to model and predict the light sensor's response to a hypothesized stimulus. Previous models of the light sensor treated it as a point sensor and ignored its spatial characteristics. Here we propose a parametric approach where the SSF is described by a mixture of Gaussians (MOG). By performing controlled calibration experiments with known stimulus inputs, we used nested sampling to estimate the SSF of the light sensor using an MOG model with the number of Gaussians ranging from one to five. By comparing the evidence computed for each MOG model, we found that one Gaussian is sufficient to describe the SSF to the accuracy we require. Future work will involve incorporating this more accurate SSF into the Bayesian machine learning software for the robotic system and studying how this detailed information about the properties of the light sensor will improve robot's ability to learn.
[ { "created": "Mon, 10 Feb 2014 14:49:22 GMT", "version": "v1" } ]
2014-02-11
[ [ "Malakar", "N. K.", "" ], [ "Mesiti", "A. J.", "" ], [ "Knuth", "K. H.", "" ] ]
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1402.2172
Serhiy Senyukov
Serhiy Senyukov, Jerome Baudot, Auguste Besson, Giles Claus, Loic Cousin, Wojciech Dulinski, Mathieu Goffe, Boris Hippolyte, Robert Maria, Levente Molnar, Xitzel Sanchez Castro, Marc Winter
Development of CMOS pixel sensors for tracking and vertexing in high energy physics experiments
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physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
CMOS pixel sensors (CPS) represent a novel technological approach to building charged particle detectors. CMOS processes allow to integrate a sensing volume and readout electronics in a single silicon die allowing to build sensors with a small pixel pitch ($\sim 20 \mu m$) and low material budget ($\sim 0.2-0.3\% X_0$) per layer. These characteristics make CPS an attractive option for vertexing and tracking systems of high energy physics experiments. Moreover, thanks to the mass production industrial CMOS processes used for the manufacturing of CPS the fabrication construction cost can be significantly reduced in comparison to more standard semiconductor technologies. However, the attainable performance level of the CPS in terms of radiation hardness and readout speed is mostly determined by the fabrication parameters of the CMOS processes available on the market rather than by the CPS intrinsic potential. The permanent evolution of commercial CMOS processes towards smaller feature sizes and high resistivity epitaxial layers leads to the better radiation hardness and allows the implementation of accelerated readout circuits. The TowerJazz $0.18 \mu m$ CMOS process being one of the most relevant examples recently became of interest for several future detector projects. The most imminent of these project is an upgrade of the Inner Tracking System (ITS) of the ALICE detector at LHC. It will be followed by the Micro-Vertex Detector (MVD) of the CBM experiment at FAIR. Other experiments like ILD consider CPS as one of the viable options for flavour tagging and tracking sub-systems.
[ { "created": "Mon, 10 Feb 2014 15:00:12 GMT", "version": "v1" } ]
2014-02-11
[ [ "Senyukov", "Serhiy", "" ], [ "Baudot", "Jerome", "" ], [ "Besson", "Auguste", "" ], [ "Claus", "Giles", "" ], [ "Cousin", "Loic", "" ], [ "Dulinski", "Wojciech", "" ], [ "Goffe", "Mathieu", "" ], [ "Hippolyte", "Boris", "" ], [ "Maria", "Robert", "" ], [ "Molnar", "Levente", "" ], [ "Castro", "Xitzel Sanchez", "" ], [ "Winter", "Marc", "" ] ]
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1402.2173
Dina Chernikova Dr.
Dina Chernikova, K{\aa}re Axell
A new concept for safeguarding and labeling of long-term stored waste and its place in the scope of existing tagging techniques
Workshop - Scanning the Horizon: Novel Techniques and Methods for Safeguards, International Atomic Energy Agency, IAEA Headquarters in Vienna, Austria, 2014
null
null
null
physics.ins-det nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The idea of a novel labeling method is suggested for a new way of long-term security identification, inventory tracking, prevention of falsification and theft of waste casks, copper canisters, spent fuel containers, mercury containers, waste packages and other items. The suggested concept is based on the use of a unique combination of radioisotopes with different predictable half life. As an option for applying the radioisotope tag to spent fuel safeguarding it is suggested to use a mixture of {\alpha}-emitting isotopes, such as 241Am etc., with materials that easily undergo {\alpha}-induced reactions with emission of specific {\gamma}-lines. Thus, the existing problem of the disposing of smoke detectors or other devices [1] which contain radioisotopes can be addressed, indirectly solving an existing waste problem. The results of the first pilot experiments with two general designs of storage canisters, namely a steel container which corresponds to the one which is commonly used for long-term storing of mercury in Europe and USA and a copper canister, the one which is in applications for nuclear repositories, are presented. As one of the options for a new labeling method it is proposed to use a multidimensional bar code symbology and tungsten plate with ultrasound techniques. It is shown that the new radioisotope label offers several advantages in the scope of existing tagging techniques (overview is given) and can be implemented even with low activity sources.
[ { "created": "Mon, 10 Feb 2014 15:00:19 GMT", "version": "v1" } ]
2014-02-11
[ [ "Chernikova", "Dina", "" ], [ "Axell", "Kåre", "" ] ]
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1402.2175
Yuichi Yoshida
Yuichi Yoshida
A Characterization of Locally Testable Affine-Invariant Properties via Decomposition Theorems
27 pages, appearing in STOC 2014. arXiv admin note: text overlap with arXiv:1306.0649, arXiv:1212.3849 by other authors
null
null
null
cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $\mathcal{P}$ be a property of function $\mathbb{F}_p^n \to \{0,1\}$ for a fixed prime $p$. An algorithm is called a tester for $\mathcal{P}$ if, given a query access to the input function $f$, with high probability, it accepts when $f$ satisfies $\mathcal{P}$ and rejects when $f$ is "far" from satisfying $\mathcal{P}$. In this paper, we give a characterization of affine-invariant properties that are (two-sided error) testable with a constant number of queries. The characterization is stated in terms of decomposition theorems, which roughly claim that any function can be decomposed into a structured part that is a function of a constant number of polynomials, and a pseudo-random part whose Gowers norm is small. We first give an algorithm that tests whether the structured part of the input function has a specific form. Then we show that an affine-invariant property is testable with a constant number of queries if and only if it can be reduced to the problem of testing whether the structured part of the input function is close to one of a constant number of candidates.
[ { "created": "Mon, 10 Feb 2014 15:03:42 GMT", "version": "v1" } ]
2014-02-11
[ [ "Yoshida", "Yuichi", "" ] ]
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1402.2180
Christopher Prohm
Christopher Prohm, Nikolas Z\"oller, Holger Stark
Controlling inertial focussing using rotational motion
null
null
null
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In inertial microfluidics lift forces cause a particle to migrate across streamlines to specific positions in the cross section of a microchannel. We control the rotational motion of a particle and demonstrate that this allows to manipulate the lift-force profile and thereby the particle's equilibrium positions. We perform two-dimensional simulation studies using the method of multi-particle collision dynamics. Particles with unconstrained rotational motion occupy stable equilibrium positions in both halfs of the channel while the center is unstable. When an external torque is applied to the particle, two equilibrium positions annihilate by passing a saddle-node bifurcation and only one stable fixpoint remains so that all particles move to one side of the channel. In contrast, non-rotating particles accumulate in the center and are pushed into one half of the channel when the angular velocity is fixed to a non-zero value.
[ { "created": "Mon, 10 Feb 2014 15:14:18 GMT", "version": "v1" } ]
2014-02-11
[ [ "Prohm", "Christopher", "" ], [ "Zöller", "Nikolas", "" ], [ "Stark", "Holger", "" ] ]
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1402.2184
Boris Konev
Boris Konev and Alexei Lisitsa
A SAT Attack on the Erdos Discrepancy Conjecture
8 pages. The description of the automata is clarified
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cs.DM math.CO math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In 1930s Paul Erdos conjectured that for any positive integer C in any infinite +1 -1 sequence (x_n) there exists a subsequence x_d, x_{2d}, ... , x_{kd} for some positive integers k and d, such that |x_d + x_{2d} + ... + x_{kd}|> C. The conjecture has been referred to as one of the major open problems in combinatorial number theory and discrepancy theory. For the particular case of C=1 a human proof of the conjecture exists; for C=2 a bespoke computer program had generated sequences of length 1124 having discrepancy 2, but the status of the conjecture remained open even for such a small bound. We show that by encoding the problem into Boolean satisfiability and applying the state of the art SAT solvers, one can obtain a sequence of length 1160 with discrepancy 2 and a proof of the Erdos discrepancy conjecture for C=2, claiming that no sequence of length 1161 and discrepancy 2 exists. We also present our partial results for the case of C=3.
[ { "created": "Mon, 10 Feb 2014 15:33:07 GMT", "version": "v1" }, { "created": "Mon, 17 Feb 2014 09:06:41 GMT", "version": "v2" } ]
2014-02-18
[ [ "Konev", "Boris", "" ], [ "Lisitsa", "Alexei", "" ] ]
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1402.2185
Charles-Michel Marle
Charles-Michel Marle (IMJ)
Relativity, the Special Theory, explained to Children (from 7 to 107 years old)
12 pages, 6 figures. Enhanced version of a talk presented at Albert Einstein Century International Conference, Paris : France (2005)
null
null
MSC 83A05
physics.pop-ph
http://creativecommons.org/licenses/by/4.0/
The author thinks that the main ideas or Relativity Theory can be explained to children (around the age of 15 or 16) without complicated calculations, by using very simple arguments of affine geometry. The proposed approach is presented as a conversation between the author and one of his grand-children. Limited here to the Special Theory, it will be extended to the General Theory elsewhere, as sketched in conclusion.
[ { "created": "Sat, 1 Feb 2014 20:05:14 GMT", "version": "v1" }, { "created": "Sat, 19 Dec 2020 15:24:46 GMT", "version": "v2" } ]
2020-12-22
[ [ "Marle", "Charles-Michel", "", "IMJ" ] ]
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1402.2187
Carlo Rodrigues KLEBER
Carlo Kleber Da Silva Rodrigues
Analyzing Peer Selection Policies for BitTorrent Multimedia On-Demand Streaming Systems in Internet
19 PAGES
International Journal of Computer Networks & Communications (IJCNC) Vol.6, No.1, January 2014
10.5121/ijcnc.2014.6114
null
cs.NI cs.MM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The adaptation of the BitTorrent protocol to multimedia on-demand streaming systems essentially lies on the modification of its two core algorithms, namely the piece and the peer selection policies, respectively. Much more attention has though been given to the piece selection policy. Within this context, this article proposes three novel peer selection policies for the design of BitTorrent-like protocols targeted at that type of systems: Select Balanced Neighbour Policy (SBNP), Select Regular Neighbour Policy (SRNP), and Select Optimistic Neighbour Policy (SONP). These proposals are validated through a competitive analysis based on simulations which encompass a variety of multimedia scenarios, defined in function of important characterization parameters such as content type, content size, and client interactivity profile. Service time, number of clients served and efficiency retrieving coefficient are the performance metrics assessed in the analysis. The final results mainly show that the novel proposals constitute scalable solutions that may be considered for real project designs. Lastly, future work is included in the conclusion of this paper.
[ { "created": "Mon, 10 Feb 2014 15:36:41 GMT", "version": "v1" } ]
2014-02-11
[ [ "Rodrigues", "Carlo Kleber Da Silva", "" ] ]
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Analyzing Peer Selection Policies for BitTorrent Multimedia On-Demand Streaming Systems in Internet
https://arxiv.org/abs/1402.2187v1
https://arxiv.org/pdf/1402.2187v1.pdf
https://github.com/unovongalixor/uvgTorrent-c
false
false
https://paperswithcode.com/paper/analyzing-peer-selection-policies-for
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1402.2188
Anitha Chacko Mary M.O.
Anitha Mary M.O. Chacko, P.M Dhanya
Handwritten Character Recognition In Malayalam Scripts- A Review
11 pages,4 figures,2 tables
International Journal of Artificial Intelligence & Applications (IJAIA), Vol. 5, No. 1, January 2014
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Handwritten character recognition is one of the most challenging and ongoing areas of research in the field of pattern recognition. HCR research is matured for foreign languages like Chinese and Japanese but the problem is much more complex for Indian languages. The problem becomes even more complicated for South Indian languages due to its large character set and the presence of vowels modifiers and compound characters. This paper provides an overview of important contributions and advances in offline as well as online handwritten character recognition of Malayalam scripts.
[ { "created": "Mon, 10 Feb 2014 15:41:48 GMT", "version": "v1" } ]
2014-02-11
[ [ "Chacko", "Anitha Mary M. O.", "" ], [ "Dhanya", "P. M", "" ] ]
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1402.2189
Jung-Hun Seo
Jung-Hun Seo, Jung Ho Park, Zhenqiang Ma, Jinnil Choi and Byeong-Kwon Ju
Nanopatterning by Laser Interference Lithography: Applications to Optical Devices
16 pages, 13 figures
null
10.1166/jnn.2014.9199
null
cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A systematic review, covering fabrication of nanoscale patterns by laser interference lithography (LIL) and their applications for optical devices are provided. LIL is a patterning method with simple, quick process over a large area without using a mask. LIL is a powerful technique for the definition of large-area, nanometer-scale, periodically patterned structures. Patterns are recorded in a light-sensitive medium that responds nonlinearly to the intensity distribution associated with the interference of two or more coherent beams of light. The photoresist patterns produced with LIL are the platform for further fabrication of nanostructures and growth of functional materials which are the building blocks for devices. Demonstration of optical and photonic devices by LIL is reviewed such as directed nano photonics and surface plasmon resonance (SPR) or large area membrane reflectors and anti-reflectors. Perspective on future directions for LIL and emerging applications in other fields are presented.
[ { "created": "Mon, 10 Feb 2014 15:46:17 GMT", "version": "v1" } ]
2014-03-20
[ [ "Seo", "Jung-Hun", "" ], [ "Park", "Jung Ho", "" ], [ "Ma", "Zhenqiang", "" ], [ "Choi", "Jinnil", "" ], [ "Ju", "Byeong-Kwon", "" ] ]
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1402.2190
Yasser Abd El-Latif
Yasser M. Abd El-Latif
Surfaces Representation with Sharp Features Using Sqrt(3) and Loop Subdivision Schemes
14 pages, 9 figures
IJCGA Vol.4, No.1, January 2014 International Journal of Computer Graphics & Animation
10.5121/ijcga.2014.4104
null
cs.CG cs.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a hybrid algorithm that combines features form both Sqrt(3) and Loop Subdivision schemes. The algorithm aims at preserving sharp features and trim regions, during the surfaces subdivision, using a set of rules. The implementation is nontrivial due to the computational, topological, and smoothness constraints, which should be satisfied by the underlying surface. The fundamental innovation, in this research work, is the ability to preserve sharp features anywhere on a surface. In addition, the resulting representation remains within the multiresolution subdivision framework. Preserving the original representation has a core advantage that all the applicable operations to the multiresolution subdivision surfaces can subsequently be applied to the edited model. Experimental results, including surfaces coarsening and smoothing, were performed using the proposed algorithm for validation purposes, and the results revealed that the proposed algorithm outperforms the other recent state of the art algorithms.
[ { "created": "Mon, 10 Feb 2014 15:47:13 GMT", "version": "v1" } ]
2014-02-11
[ [ "El-Latif", "Yasser M. Abd", "" ] ]
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1402.2192
Jiulin Du
Yanjun Zhou and Jiulin Du
Kramers escape rate in overdamped systems with the power-law distribution
12 pages, 1 figure
Physica A 402 (2014) 299
10.1016/j.physa.2014.01.065
null
cond-mat.stat-mech physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Kramers escape rate in the overdamped systems with the power-law distribution is studied. By using the mean first passage time, we derive the escape rate for the power-law distribution and obtain the Kramers' infinite barrier escape rate in this case. It is shown that the escape rate for the power-law distribution extends the Kramers' overdamped result to the relatively low barrier. Furthermore, we apply the escape rate for the power-law distribution to the unfolding of titin and show a better agreement with the experimental rate than the traditional escape rate.
[ { "created": "Mon, 10 Feb 2014 15:53:40 GMT", "version": "v1" }, { "created": "Tue, 11 Feb 2014 02:46:44 GMT", "version": "v2" } ]
2015-08-10
[ [ "Zhou", "Yanjun", "" ], [ "Du", "Jiulin", "" ] ]
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