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1401.6567
Kamal Sarkar
Vivekananda Gayen, Kamal Sarkar
A Machine Learning Approach for the Identification of Bengali Noun-Noun Compound Multiword Expressions
null
In Proceedings of ICON-2013: 10th International Conference on Natural Language Processing, pp 290-296
null
null
cs.CL cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a machine learning approach for identification of Bengali multiword expressions (MWE) which are bigram nominal compounds. Our proposed approach has two steps: (1) candidate extraction using chunk information and various heuristic rules and (2) training the machine learning algorithm called Random Forest to classify the candidates into two groups: bigram nominal compound MWE or not bigram nominal compound MWE. A variety of association measures, syntactic and linguistic clues and a set of WordNet-based similarity features have been used for our MWE identification task. The approach presented in this paper can be used to identify bigram nominal compound MWE in Bengali running text.
[ { "created": "Sat, 25 Jan 2014 18:45:29 GMT", "version": "v1" } ]
2014-01-28
[ [ "Gayen", "Vivekananda", "" ], [ "Sarkar", "Kamal", "" ] ]
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1401.6568
Josep Llosa
Josep Llosa
Yet another derivation of special relativity transformations without the second postulate
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null
null
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The most general transformation connecting inertial frames is derived from rather general and simple assumptions, without the postulate of constancy of the speed of light in vacuo.
[ { "created": "Sat, 25 Jan 2014 18:45:53 GMT", "version": "v1" } ]
2014-01-28
[ [ "Llosa", "Josep", "" ] ]
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1401.6571
Shibamouli Lahiri
Shibamouli Lahiri, Sagnik Ray Choudhury, Cornelia Caragea
Keyword and Keyphrase Extraction Using Centrality Measures on Collocation Networks
11 pages
null
null
null
cs.CL cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Keyword and keyphrase extraction is an important problem in natural language processing, with applications ranging from summarization to semantic search to document clustering. Graph-based approaches to keyword and keyphrase extraction avoid the problem of acquiring a large in-domain training corpus by applying variants of PageRank algorithm on a network of words. Although graph-based approaches are knowledge-lean and easily adoptable in online systems, it remains largely open whether they can benefit from centrality measures other than PageRank. In this paper, we experiment with an array of centrality measures on word and noun phrase collocation networks, and analyze their performance on four benchmark datasets. Not only are there centrality measures that perform as well as or better than PageRank, but they are much simpler (e.g., degree, strength, and neighborhood size). Furthermore, centrality-based methods give results that are competitive with and, in some cases, better than two strong unsupervised baselines.
[ { "created": "Sat, 25 Jan 2014 19:05:45 GMT", "version": "v1" } ]
2014-01-28
[ [ "Lahiri", "Shibamouli", "" ], [ "Choudhury", "Sagnik Ray", "" ], [ "Caragea", "Cornelia", "" ] ]
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1401.6573
Christian Retore
Livy-Maria Real-Coelho (LaBRI, UFPR), Christian Retor\'e (LaBRI, IRIT)
Deverbal semantics and the Montagovian generative lexicon
A revised version will appear in the Journal of Logic, Language and Information
Journal of Logic, Language and Information (2014) 21
10.1007/s10849-014-9187-y
null
cs.CL cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a lexical account of action nominals, in particular of deverbal nominalisations, whose meaning is related to the event expressed by their base verb. The literature about nominalisations often assumes that the semantics of the base verb completely defines the structure of action nominals. We argue that the information in the base verb is not sufficient to completely determine the semantics of action nominals. We exhibit some data from different languages, especially from Romance language, which show that nominalisations focus on some aspects of the verb semantics. The selected aspects, however, seem to be idiosyncratic and do not automatically result from the internal structure of the verb nor from its interaction with the morphological suffix. We therefore propose a partially lexicalist approach view of deverbal nouns. It is made precise and computable by using the Montagovian Generative Lexicon, a type theoretical framework introduced by Bassac, Mery and Retor\'e in this journal in 2010. This extension of Montague semantics with a richer type system easily incorporates lexical phenomena like the semantics of action nominals in particular deverbals, including their polysemy and (in)felicitous copredications.
[ { "created": "Sat, 25 Jan 2014 19:50:51 GMT", "version": "v1" } ]
2014-02-07
[ [ "Real-Coelho", "Livy-Maria", "", "LaBRI, UFPR" ], [ "Retoré", "Christian", "", "LaBRI, IRIT" ] ]
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1401.6574
Christian Retore
Jean Gillibert (IMB), Christian Retor\'e (LaBRI)
Category theory, logic and formal linguistics: some connections, old and new
Survey on the occasion of a special issue of the journal of applied logic
Journal of Applied Logic 12, 1 (2014) 1--13
10.1016/j.jal.2014.01.001
null
math.CT cs.CL cs.LO math.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We seize the opportunity of the publication of selected papers from the \emph{Logic, categories, semantics} workshop in the \emph{Journal of Applied Logic} to survey some current trends in logic, namely intuitionistic and linear type theories, that interweave categorical, geometrical and computational considerations. We thereafter present how these rich logical frameworks can model the way language conveys meaning.
[ { "created": "Sat, 25 Jan 2014 19:54:18 GMT", "version": "v1" } ]
2014-02-07
[ [ "Gillibert", "Jean", "", "IMB" ], [ "Retoré", "Christian", "", "LaBRI" ] ]
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1401.6575
Hugo Gimbert
Hugo Gimbert (LaBRI), Edon Kelmendi
Submixing and Shift-invariant Stochastic Games
null
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider zero-sum stochastic games with perfect information and finitely many states and actions. The payoff is computed by a function which associates to each infinite sequence of states and actions a real number. We prove that if the payoff function is both shift-invariant and submixing, then the game is half-positional, i.e. the first player has an optimal strategy which is both deterministic and stationary. This result relies on the existence of epsilon-subgame-perfect strategies in shift-invariant games, a second contribution of the paper. The techniques can be used to establish a third result: for shift-invariant and submixing payoff functions, the existence of finite-memory strategies for player 2 in one-player games implies the same property for two-player games as well.
[ { "created": "Sat, 25 Jan 2014 19:55:41 GMT", "version": "v1" }, { "created": "Thu, 8 Oct 2015 08:18:15 GMT", "version": "v2" }, { "created": "Fri, 30 Apr 2021 09:55:01 GMT", "version": "v3" }, { "created": "Thu, 24 Mar 2022 09:31:12 GMT", "version": "v4" }, { "created": "Mon, 28 Mar 2022 08:49:05 GMT", "version": "v5" } ]
2022-03-29
[ [ "Gimbert", "Hugo", "", "LaBRI" ], [ "Kelmendi", "Edon", "" ] ]
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1401.6576
Luc Dartois
Luc Dartois (ULB), Charles Paperman
Adding modular predicates to first-order fragments
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null
null
null
cs.LO cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the decidability of the definability problem for fragments of first order logic over finite words enriched with modular predicates. Our approach aims toward the most generic statements that we could achieve, which successfully covers the quantifier alternation hierarchy of first order logic and some of its fragments. We obtain that deciding this problem for each level of the alternation hierarchy of both first order logic and its two-variable fragment when equipped with all regular numerical predicates is not harder than deciding it for the corresponding level equipped with only the linear order and the successor. For two-variable fragments we also treat the case of the signature containing only the order and modular predicates.Relying on some recent results, this proves the decidability for each level of the alternation hierarchy of the two-variable first order fragmentwhile in the case of the first order logic the question remains open for levels greater than two.The main ingredients of the proofs are syntactic transformations of first order formulas as well as the algebraic framework of finite categories.
[ { "created": "Sat, 25 Jan 2014 19:57:46 GMT", "version": "v1" }, { "created": "Mon, 19 May 2014 18:58:57 GMT", "version": "v2" }, { "created": "Fri, 13 Nov 2015 14:43:48 GMT", "version": "v3" } ]
2015-11-16
[ [ "Dartois", "Luc", "", "ULB" ], [ "Paperman", "Charles", "" ] ]
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1401.6578
Christos Thrampoulidis
Christos Thrampoulidis, Samet Oymak, Babak Hassibi
Simple Error Bounds for Regularized Noisy Linear Inverse Problems
6pages, 2 figure
null
null
null
math.OC cs.IT math.IT math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Consider estimating a structured signal $\mathbf{x}_0$ from linear, underdetermined and noisy measurements $\mathbf{y}=\mathbf{A}\mathbf{x}_0+\mathbf{z}$, via solving a variant of the lasso algorithm: $\hat{\mathbf{x}}=\arg\min_\mathbf{x}\{ \|\mathbf{y}-\mathbf{A}\mathbf{x}\|_2+\lambda f(\mathbf{x})\}$. Here, $f$ is a convex function aiming to promote the structure of $\mathbf{x}_0$, say $\ell_1$-norm to promote sparsity or nuclear norm to promote low-rankness. We assume that the entries of $\mathbf{A}$ are independent and normally distributed and make no assumptions on the noise vector $\mathbf{z}$, other than it being independent of $\mathbf{A}$. Under this generic setup, we derive a general, non-asymptotic and rather tight upper bound on the $\ell_2$-norm of the estimation error $\|\hat{\mathbf{x}}-\mathbf{x}_0\|_2$. Our bound is geometric in nature and obeys a simple formula; the roles of $\lambda$, $f$ and $\mathbf{x}_0$ are all captured by a single summary parameter $\delta(\lambda\partial((f(\mathbf{x}_0)))$, termed the Gaussian squared distance to the scaled subdifferential. We connect our result to the literature and verify its validity through simulations.
[ { "created": "Sat, 25 Jan 2014 20:34:39 GMT", "version": "v1" } ]
2014-01-28
[ [ "Thrampoulidis", "Christos", "" ], [ "Oymak", "Samet", "" ], [ "Hassibi", "Babak", "" ] ]
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1401.6580
Maha Alodeh
Maha Alodeh, Symeon Chatzinotas, and Bjorn Ottersten
A Multicast Approach for Constructive Interference Precoding in MISO Downlink Channel
5 pages, 3 figures. Accepted for a publication in the proceedings of ISIT
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies the concept of jointly utilizing the data information(DI)and channel state information (CSI) in order to design symbol-level precoders for a multiple input and single output (MISO) downlink channel. In this direction, the interference among the simultaneous data streams is transformed to useful signal that can improve the signal to interference noise ratio (SINR) of the downlink transmissions. We propose a maximum ratio transmissions (MRT) based algorithm that jointly exploits DI and CSI to gain the benefits from these useful signals. In this context, a novel framework to minimize the power consumption is proposed by formalizing the duality between the constructive interference downlink channel and the multicast channels. The numerical results have shown that the proposed schemes outperform other state of the art techniques.
[ { "created": "Sat, 25 Jan 2014 20:58:29 GMT", "version": "v1" }, { "created": "Wed, 23 Apr 2014 21:04:11 GMT", "version": "v2" }, { "created": "Tue, 12 May 2015 20:48:28 GMT", "version": "v3" } ]
2015-05-14
[ [ "Alodeh", "Maha", "" ], [ "Chatzinotas", "Symeon", "" ], [ "Ottersten", "Bjorn", "" ] ]
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1401.6585
Marianna Safronova
S. G. Porsev, M. S. Safronova, A. Derevianko, and Charles W. Clark
Relativistic many-body calculations of van der Waals coefficients for Yb-Li and Yb-Rb dimers
9 pages
null
10.1103/PhysRevA.89.022703
null
physics.atom-ph cond-mat.quant-gas physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We derive the relativistic formulas for the van der Waals coefficients of Yb-alkali dimers that correlate to ground and excited separated-atom limits. We calculate $C_6$ and $C_8$ coefficients of particular experimental interest. We also derive a semi-empirical formula that expresses the $C_8$ coefficient of heteronuclear $A+B$ dimers in terms of the $C_6$ and $C_8$ coefficients of homonuclear dimers and the static dipole and quadrupole polarizabilities of the atomic states $A$ and $B$. We report results of calculation of the $C_6$ coefficients for the Yb-Rb $^3/!P_1^o+5s\, ^2/!S_{1/2}$ and $^1/!S_0+5p\, ^2/!P^o_{1/2}$ dimers, and the $C_8$ coefficients for the Yb-Li $^1/!S_0+2s\, ^2/!S_{1/2}$ and Yb-Rb $^1/!S_0+5s\, ^2/!S_{1/2}$ dimers. Uncertainties are estimated for all predicted properties.
[ { "created": "Sat, 25 Jan 2014 21:54:13 GMT", "version": "v1" } ]
2015-06-18
[ [ "Porsev", "S. G.", "" ], [ "Safronova", "M. S.", "" ], [ "Derevianko", "A.", "" ], [ "Clark", "Charles W.", "" ] ]
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1401.6594
Maciej Balajewicz
Maciej Balajewicz, Charbel Farhat
Reduction of Nonlinear Embedded Boundary Models for Problems with Evolving Interfaces
null
J. Comput. Phys. (2014), vol. 274, pp. 489-504
10.1016/j.jcp.2014.06.038
null
physics.comp-ph cs.NA math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Embedded boundary methods alleviate many computational challenges, including those associated with meshing complex geometries and solving problems with evolving domains and interfaces. Developing model reduction methods for computational frameworks based on such methods seems however to be challenging. Indeed, most popular model reduction techniques are projection-based, and rely on basis functions obtained from the compression of simulation snapshots. In a traditional interface-fitted computational framework, the computation of such basis functions is straightforward, primarily because the computational domain does not contain in this case a fictitious region. This is not the case however for an embedded computational framework because the computational domain typically contains in this case both real and ghost regions whose definitions complicate the collection and compression of simulation snapshots. The problem is exacerbated when the interface separating both regions evolves in time. This paper addresses this issue by formulating the snapshot compression problem as a weighted low-rank approximation problem where the binary weighting identifies the evolving component of the individual simulation snapshots. The proposed approach is application independent and therefore comprehensive. It is successfully demonstrated for the model reduction of several two-dimensional, vortex-dominated, fluid-structure interaction problems.
[ { "created": "Sat, 25 Jan 2014 23:31:54 GMT", "version": "v1" } ]
2014-07-09
[ [ "Balajewicz", "Maciej", "" ], [ "Farhat", "Charbel", "" ] ]
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1401.6596
Sadi Seker E
Sadi Evren Seker, Oguz Altun, U\u{g}ur Ayan and Cihan Mert
A Novel String Distance Function based on Most Frequent K Characters
null
International Journal of Machine Learning and Computation (IJMLC), Issn : 2010-3700, vol.4, is.2, pp.177-183, 2014
null
null
cs.DS cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This study aims to publish a novel similarity metric to increase the speed of comparison operations. Also the new metric is suitable for distance-based operations among strings. Most of the simple calculation methods, such as string length are fast to calculate but does not represent the string correctly. On the other hand the methods like keeping the histogram over all characters in the string are slower but good to represent the string characteristics in some areas, like natural language. We propose a new metric, easy to calculate and satisfactory for string comparison. Method is built on a hash function, which gets a string at any size and outputs the most frequent K characters with their frequencies. The outputs are open for comparison and our studies showed that the success rate is quite satisfactory for the text mining operations.
[ { "created": "Sat, 25 Jan 2014 23:40:46 GMT", "version": "v1" } ]
2014-01-28
[ [ "Seker", "Sadi Evren", "" ], [ "Altun", "Oguz", "" ], [ "Ayan", "Uğur", "" ], [ "Mert", "Cihan", "" ] ]
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1401.6597
Sadi Seker E
Sadi Evren Seker, Y. Unal, Z. Erdem, and H. Erdinc Kocer
Ensembled Correlation Between Liver Analysis Outputs
null
International Journal of Biology and Biomedical Engineering, ISSN: 1998-4510, Volume 8, pp. 1-5, 2014
null
null
stat.ML cs.CE cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Data mining techniques on the biological analysis are spreading for most of the areas including the health care and medical information. We have applied the data mining techniques, such as KNN, SVM, MLP or decision trees over a unique dataset, which is collected from 16,380 analysis results for a year. Furthermore we have also used meta-classifiers to question the increased correlation rate between the liver disorder and the liver analysis outputs. The results show that there is a correlation among ALT, AST, Billirubin Direct and Billirubin Total down to 15% of error rate. Also the correlation coefficient is up to 94%. This makes possible to predict the analysis results from each other or disease patterns can be applied over the linear correlation of the parameters.
[ { "created": "Sat, 25 Jan 2014 23:52:37 GMT", "version": "v1" } ]
2014-01-28
[ [ "Seker", "Sadi Evren", "" ], [ "Unal", "Y.", "" ], [ "Erdem", "Z.", "" ], [ "Kocer", "H. Erdinc", "" ] ]
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1401.6598
Julio C\'esar Arreola Fr\'ias M.C.
Alberto Ochoa-Zezzatti, Luana Hatsukimi, Hitomi Karuda, Julio Arreola and Sandra Bustillos
Never forget, whom was my ancestors: A cross-cultural analysis from Yonsei (fourth-generation Nikkei) in four societies using Data Mining
7 pages, 2 figures, 1 table
null
null
null
cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This research explains the importance of transculturality in social networking in a wide variety of activities of our daily life. We focus our analysis to online activities that use social richness, analyzing societies in Yakutia (A Russian Republic), Macau in China, Uberl\^andia in Brazil and Juarez City in Mexico, all with people descending from Japanese people. To this end, we performed surveys to gathering information about salient aspects of upgrade and combined them using social data mining techniques to profile a number of behavioural patterns and choices that describe social networking behaviours in these societies.
[ { "created": "Sun, 26 Jan 2014 00:02:31 GMT", "version": "v1" } ]
2014-01-28
[ [ "Ochoa-Zezzatti", "Alberto", "" ], [ "Hatsukimi", "Luana", "" ], [ "Karuda", "Hitomi", "" ], [ "Arreola", "Julio", "" ], [ "Bustillos", "Sandra", "" ] ]
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1401.6601
Maria Bruna
Maria Bruna, S. Jonathan Chapman, Matthew J. Smith
Model reduction for slow-fast stochastic systems with metastable behaviour
null
null
10.1063/1.4871694
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The quasi-steady-state approximation (or stochastic averaging principle) is a useful tool in the study of multiscale stochastic systems, giving a practical method by which to reduce the number of degrees of freedom in a model. The method is extended here to slow-fast systems in which the fast variables exhibit metastable behaviour. The key parameter that determines the form of the reduced model is the ratio of the timescale for the switching of the fast variables between metastable states to the timescale for the evolution of the slow variables. The method is illustrated with two examples: one from biochemistry (a fast-species-mediated chemical switch coupled to a slower-varying species), and one from ecology (a predator-prey system). Numerical simulations of each model reduction are compared with those of the full system.
[ { "created": "Sun, 26 Jan 2014 01:04:22 GMT", "version": "v1" }, { "created": "Wed, 5 Feb 2014 18:27:05 GMT", "version": "v2" }, { "created": "Tue, 22 Apr 2014 18:00:43 GMT", "version": "v3" } ]
2015-06-18
[ [ "Bruna", "Maria", "" ], [ "Chapman", "S. Jonathan", "" ], [ "Smith", "Matthew J.", "" ] ]
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1401.6604
Baofeng Wu
Baofeng Wu, Qingfang Jin, Zhuojun Liu, Dongdai Lin
Constructing Boolean Functions With Potential Optimal Algebraic Immunity Based on Additive Decompositions of Finite Fields
null
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a general approach to construct cryptographic significant Boolean functions of $(r+1)m$ variables based on the additive decomposition $\mathbb{F}_{2^{rm}}\times\mathbb{F}_{2^m}$ of the finite field $\mathbb{F}_{2^{(r+1)m}}$, where $r$ is odd and $m\geq3$. A class of unbalanced functions are constructed first via this approach, which coincides with a variant of the unbalanced class of generalized Tu-Deng functions in the case $r=1$. This class of functions have high algebraic degree, but their algebraic immunity does not exceeds $m$, which is impossible to be optimal when $r>1$. By modifying these unbalanced functions, we obtain a class of balanced functions which have optimal algebraic degree and high nonlinearity (shown by a lower bound we prove). These functions have optimal algebraic immunity provided a combinatorial conjecture on binary strings which generalizes the Tu-Deng conjecture is true. Computer investigations show that, at least for small values of number of variables, functions from this class also behave well against fast algebraic attacks.
[ { "created": "Sun, 26 Jan 2014 01:49:10 GMT", "version": "v1" } ]
2014-01-28
[ [ "Wu", "Baofeng", "" ], [ "Jin", "Qingfang", "" ], [ "Liu", "Zhuojun", "" ], [ "Lin", "Dongdai", "" ] ]
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1401.6606
Giuseppe Lisanti
Giuseppe Lisanti and Iacopo Masi and Federico Pernici and Alberto Del Bimbo
Continuous Localization and Mapping of a Pan Tilt Zoom Camera for Wide Area Tracking
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Pan-tilt-zoom (PTZ) cameras are powerful to support object identification and recognition in far-field scenes. However, the effective use of PTZ cameras in real contexts is complicated by the fact that a continuous on-line camera calibration is needed and the absolute pan, tilt and zoom positional values provided by the camera actuators cannot be used because are not synchronized with the video stream. So, accurate calibration must be directly extracted from the visual content of the frames. Moreover, the large and abrupt scale changes, the scene background changes due to the camera operation and the need of camera motion compensation make target tracking with these cameras extremely challenging. In this paper, we present a solution that provides continuous on-line calibration of PTZ cameras which is robust to rapid camera motion, changes of the environment due to illumination or moving objects and scales beyond thousands of landmarks. The method directly derives the relationship between the position of a target in the 3D world plane and the corresponding scale and position in the 2D image, and allows real-time tracking of multiple targets with high and stable degree of accuracy even at far distances and any zooming level.
[ { "created": "Sun, 26 Jan 2014 02:23:56 GMT", "version": "v1" }, { "created": "Mon, 23 Mar 2015 18:28:02 GMT", "version": "v2" } ]
2015-03-24
[ [ "Lisanti", "Giuseppe", "" ], [ "Masi", "Iacopo", "" ], [ "Pernici", "Federico", "" ], [ "Del Bimbo", "Alberto", "" ] ]
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1401.6615
Lewis Tseng
Lewis Tseng, and Nitin Vaidya
Iterative Approximate Consensus in the presence of Byzantine Link Failures
arXiv admin note: text overlap with arXiv:1202.6094
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null
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cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper explores the problem of reaching approximate consensus in synchronous point-to-point networks, where each directed link of the underlying communication graph represents a communication channel between a pair of nodes. We adopt the transient Byzantine link failure model [15, 16], where an omniscient adversary controls a subset of the directed communication links, but the nodes are assumed to be fault-free. Recent work has addressed the problem of reaching approximate consen- sus in incomplete graphs with Byzantine nodes using a restricted class of iterative algorithms that maintain only a small amount of memory across iterations [22, 21, 23, 12]. However, to the best of our knowledge, we are the first to consider approximate consensus in the presence of Byzan- tine links. We extend our past work that provided exact characterization of graphs in which the iterative approximate consensus problem in the presence of Byzantine node failures is solvable [22, 21]. In particular, we prove a tight necessary and sufficient condition on the underlying com- munication graph for the existence of iterative approximate consensus algorithms under transient Byzantine link model. The condition answers (part of) the open problem stated in [16].
[ { "created": "Sun, 26 Jan 2014 05:45:02 GMT", "version": "v1" } ]
2016-10-31
[ [ "Tseng", "Lewis", "" ], [ "Vaidya", "Nitin", "" ] ]
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1401.6620
Anbang Wang
Anbang Wang, Yuncai Wang, Bingjie Wang, Lei Li, Mingjiang Zhang, Wendong Zhang
Physical white chaos generation
5 pages, 5 figures
null
10.1109/JSTQE.2015.2427253
null
physics.optics nlin.CD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Physical chaos is a fascinating prospect for high-speed data security by serving as a masking carrier or a key source, but suffers from a colored spectrum that divulges system's intrinsic oscillations and degrades randomness. Here, we demonstrate that physical chaos with a white spectrum can be achieved by the optical heterodyning of two delayed-feedback lasers. A white chaotic spectrum with 1-dB fluctuation in a band of 11 GHz is experimentally obtained. The white chaos also has a perfect delta-like autocorrelation function and a high dimensionality of greater than 10, which makes chaos reconstruction extremely difficult and thus improves security.
[ { "created": "Sun, 26 Jan 2014 06:52:33 GMT", "version": "v1" } ]
2017-02-20
[ [ "Wang", "Anbang", "" ], [ "Wang", "Yuncai", "" ], [ "Wang", "Bingjie", "" ], [ "Li", "Lei", "" ], [ "Zhang", "Mingjiang", "" ], [ "Zhang", "Wendong", "" ] ]
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1401.6621
Zwi Altman
Zwi Altman, Soumaya Sallem (CEA), Ridha Nasri, Berna Sayrac, Maurice Clerc
Particle Swarm Optimization for Mobility Load Balancing SON in LTE Networks
null
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a self-optimizing solution for Mobility Load Balancing (MLB). The MLB-SON is performed in two phases. In the first, a MLB controller is designed using Multi-Objective Particle Swarm Optimization (MO-PSO) which incorporates a priori expert knowledge to considerably reduce the search space and optimization time. The dynamicity of the optimization phase is addressed. In the second phase, the controller is pushed into the base stations to implement the MLB SON. The method is applied to dynamically adapt Handover Margin parameters of a large scale LTE network in order to balance traffic of the network eNodeBs. Numerical results illustrate the benefits of the proposed solution.
[ { "created": "Sun, 26 Jan 2014 07:31:07 GMT", "version": "v1" } ]
2014-01-28
[ [ "Altman", "Zwi", "", "CEA" ], [ "Sallem", "Soumaya", "", "CEA" ], [ "Nasri", "Ridha", "" ], [ "Sayrac", "Berna", "" ], [ "Clerc", "Maurice", "" ] ]
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1401.6626
Ahmed Douik
Ahmed Douik, and Sameh Sorour, and Mohamed-Slim Alouini, and Tareq Y. Al-Naffour
Completion Time Reduction in Instantly Decodable Network Coding Through Decoding Delay Control
null
null
null
null
cs.IT cs.NI math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For several years, the completion time and decoding delay problems in Instantly Decodable Network Coding (IDNC) were considered separately and were thought to completely act against each other. Recently, some works aimed to balance the effects of these two important IDNC metrics but none of them studied a further optimization of one by controlling the other. In this paper, we study the effect of controlling the decoding delay to reduce the completion time below its currently best known solution. We first derive the decoding-delay-dependent expressions of the users' and overall completion times. Although using such expressions to find the optimal overall completion time is NP-hard, we design a novel heuristic that minimizes the probability of increasing the maximum of these decoding-delay-dependent completion time expressions after each transmission through a layered control of their decoding delays. Simulation results show that this new algorithm achieves both a lower mean completion time and mean decoding delay compared to the best known heuristic for completion time reduction. The gap in performance becomes significant for harsh erasure scenarios.
[ { "created": "Sun, 26 Jan 2014 08:22:11 GMT", "version": "v1" }, { "created": "Wed, 5 Feb 2014 10:56:29 GMT", "version": "v2" }, { "created": "Thu, 3 Apr 2014 09:24:24 GMT", "version": "v3" } ]
2014-04-04
[ [ "Douik", "Ahmed", "" ], [ "Sorour", "Sameh", "" ], [ "Alouini", "Mohamed-Slim", "" ], [ "Al-Naffour", "Tareq Y.", "" ] ]
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1401.6628
Yuqing Zhu
Yuqing Zhu, Jianfeng Zhan, Chuliang Weng, Raghunath Nambiar, Jinchao Zhang, Xingzhen Chen, and Lei Wang
BigOP: Generating Comprehensive Big Data Workloads as a Benchmarking Framework
10 pages, 3 figures
Database Systems for Advanced Applications: 19th International Conference, DASFAA 2014, Bali, Indonesia, April 21-24, 2014
null
null
cs.DC cs.DB cs.PF
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Big Data is considered proprietary asset of companies, organizations, and even nations. Turning big data into real treasure requires the support of big data systems. A variety of commercial and open source products have been unleashed for big data storage and processing. While big data users are facing the choice of which system best suits their needs, big data system developers are facing the question of how to evaluate their systems with regard to general big data processing needs. System benchmarking is the classic way of meeting the above demands. However, existent big data benchmarks either fail to represent the variety of big data processing requirements, or target only one specific platform, e.g. Hadoop. In this paper, with our industrial partners, we present BigOP, an end-to-end system benchmarking framework, featuring the abstraction of representative Operation sets, workload Patterns, and prescribed tests. BigOP is part of an open-source big data benchmarking project, BigDataBench. BigOP's abstraction model not only guides the development of BigDataBench, but also enables automatic generation of tests with comprehensive workloads. We illustrate the feasibility of BigOP by implementing an automatic test generation tool and benchmarking against three widely used big data processing systems, i.e. Hadoop, Spark and MySQL Cluster. Three tests targeting three different application scenarios are prescribed. The tests involve relational data, text data and graph data, as well as all operations and workload patterns. We report results following test specifications.
[ { "created": "Sun, 26 Jan 2014 08:41:50 GMT", "version": "v1" }, { "created": "Wed, 27 Dec 2017 03:56:44 GMT", "version": "v2" } ]
2017-12-29
[ [ "Zhu", "Yuqing", "" ], [ "Zhan", "Jianfeng", "" ], [ "Weng", "Chuliang", "" ], [ "Nambiar", "Raghunath", "" ], [ "Zhang", "Jinchao", "" ], [ "Chen", "Xingzhen", "" ], [ "Wang", "Lei", "" ] ]
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1401.6633
Xiao Lu
Xiao Lu, Ping Wang, Dusit Niyato
Payoff Allocation of Service Coalition in Wireless Mesh Network: A Cooperative Game Perspective
IEEE GlobeCom. 6 pages, 6 figures, 1 table
null
null
null
cs.GT cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In wireless mesh network (WMN), multiple service providers (SPs) can cooperate to share resources (e.g., relay nodes and spectrum), to serve their collective subscribed customers for better service. As a reward, SPs are able to achieve more individual benefits, i.e., increased revenue or decreased cost, through efficient utilization of shared network resources. However, this cooperation can be realized only if fair allocation of aggregated payoff, which is the sum of the payoff of all the cooperative SPs, can be achieved. We first formulate such cooperation as a coalitional game with transferable utility, specifically, a linear programming game, in which, each SP should obtain the fair share of the aggregated payoff. Then we study the problem of allocating aggregated payoff which leads to stable service coalition of SPs in WMN based on the concepts of dual payoff and Shapley value.
[ { "created": "Sun, 26 Jan 2014 10:20:32 GMT", "version": "v1" } ]
2014-01-28
[ [ "Lu", "Xiao", "" ], [ "Wang", "Ping", "" ], [ "Niyato", "Dusit", "" ] ]
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1401.6634
Somphong Jitman
Somphong Jitman, San Ling, and Ekkasit Sangwisut
Hermitian Self-Dual Cyclic Codes of Length $p^a$ over $GR(p^2,s)$
18 pages. Submitted to Advances in Mathematics of Communications
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math.RA cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study cyclic codes over the Galois ring ${\rm GR}({p^2},s)$. The main result is the characterization and enumeration of Hermitian self-dual cyclic codes of length $p^a$ over ${\rm GR}({p^2},s)$. Combining with some known results and the standard Discrete Fourier Transform decomposition, we arrive at the characterization and enumeration of Euclidean self-dual cyclic codes of any length over ${\rm GR}({p^2},s)$. Some corrections to results on Euclidean self-dual cyclic codes of even length over $\mathbb{Z}_4$ in Discrete Appl. Math. 128, (2003), 27 and Des. Codes Cryptogr. 39, (2006), 127 are provided.
[ { "created": "Sun, 26 Jan 2014 10:28:36 GMT", "version": "v1" } ]
2014-01-28
[ [ "Jitman", "Somphong", "" ], [ "Ling", "San", "" ], [ "Sangwisut", "Ekkasit", "" ] ]
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1401.6637
Noa Avigdor-Elgrabli
Noa Avigdor-Elgrabli, Yuval Rabani, and Gala Yadgar
Convergence of T\^atonnement in Fisher Markets
null
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Analyzing simple and natural price-adjustment processes that converge to a market equilibrium is a fundamental question in economics. Such an analysis may have implications in economic theory, computational economics, and distributed systems. T\^atonnement, proposed by Walras in 1874, is a process by which prices go up in response to excess demand, and down in response to excess supply. This paper analyzes the convergence of a time-discrete t\^atonnement process, a problem that recently attracted considerable attention of computer scientists. We prove that the simple t\^atonnement process that we consider converges (efficiently) to equilibrium prices and allocation in markets with nested CES-Leontief utilities, generalizing some of the previous convergence proofs for more restricted types of utility functions.
[ { "created": "Sun, 26 Jan 2014 10:55:54 GMT", "version": "v1" }, { "created": "Wed, 2 Apr 2014 18:08:01 GMT", "version": "v2" }, { "created": "Mon, 20 Apr 2015 07:38:01 GMT", "version": "v3" } ]
2015-04-21
[ [ "Avigdor-Elgrabli", "Noa", "" ], [ "Rabani", "Yuval", "" ], [ "Yadgar", "Gala", "" ] ]
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1401.6638
Tong Wu
Tong Wu, Gungor Polatkan, David Steel, William Brown, Ingrid Daubechies and Robert Calderbank
Painting Analysis Using Wavelets and Probabilistic Topic Models
5 pages, 4 figures, ICIP 2013
null
null
null
cs.CV cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, computer-based techniques for stylistic analysis of paintings are applied to the five panels of the 14th century Peruzzi Altarpiece by Giotto di Bondone. Features are extracted by combining a dual-tree complex wavelet transform with a hidden Markov tree (HMT) model. Hierarchical clustering is used to identify stylistic keywords in image patches, and keyword frequencies are calculated for sub-images that each contains many patches. A generative hierarchical Bayesian model learns stylistic patterns of keywords; these patterns are then used to characterize the styles of the sub-images; this in turn, permits to discriminate between paintings. Results suggest that such unsupervised probabilistic topic models can be useful to distill characteristic elements of style.
[ { "created": "Sun, 26 Jan 2014 11:00:46 GMT", "version": "v1" } ]
2014-01-28
[ [ "Wu", "Tong", "" ], [ "Polatkan", "Gungor", "" ], [ "Steel", "David", "" ], [ "Brown", "William", "" ], [ "Daubechies", "Ingrid", "" ], [ "Calderbank", "Robert", "" ] ]
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1401.6639
Jovo Vranjes
J. Vranjes, M. Kono
On the Alfven wave cut-off in partly ionized collisional plasmas
10 figures
Phys. Plasmas 21, 012110 (2014)
10.1063/1.4862781
null
physics.plasm-ph astro-ph.SR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The cut-off of the Alfven wave, caused by plasma collisions with neutrals in multi-component partially ionized plasmas, is discussed. Full multi-component theory is used, and similarities and differences regarding the classic magnetohydrodynamic theory are presented. It is shown that the cut-off in partially ionized plasma in principle may remain the same as predicted in classic magnetohydrodynamic works, although multi-component theory also yields some essential differences. Due to electric field, the ion motion is intrinsically two-dimensional and this results in additional forced oscillations of neutrals. One new small parameter, containing the ion inertial length, appears in the multi-component theory. This new small parameter is missing in the magnetohydrodynamic description, and it turns out that for some parameters it may be greater than the ions-to-neutrals density ratio which is the only small parameter in the magnetohydrodynamic description. Due to this the Alfven wave behavior can become much different as compared to classic magnetohydrodynamic results. It is shown also that in plasmas with unmagnetized ions, Alfv}n waves cannot be excited. This by all means applies to the solar photosphere where the ion collision frequency may be far above the ion gyro-frequency.
[ { "created": "Sun, 26 Jan 2014 11:05:36 GMT", "version": "v1" } ]
2015-06-18
[ [ "Vranjes", "J.", "" ], [ "Kono", "M.", "" ] ]
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1401.6641
Leonid Gerasimov
L. V. Gerasimov, V. M. Ezhova, D. V. Kupriyanov, Q. Baudouin, W. Guerin, R. Kaiser
Raman process under condition of radiation trapping in a disordered atomic medium
14 pages, 9 figures, accepted for publication in Physical Review A
Phys. Rev. A 90, 013814 (2014)
10.1103/PhysRevA.90.013814
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the Raman process developing in a disordered medium of alkali-metal atoms when the scattered modes are trapped on a closed transition. Our theoretical analysis, based on numerical simulations of the Bethe-Salpeter equation for the light correlation function, which includes all Zeeman states and light polarization, lets us track the stimulated amplification as well as the losses associated with the inverse anti-Stokes scattering channel. We discuss possible conditions when this process could approach the instability point and enter the regime of random lasing.
[ { "created": "Sun, 26 Jan 2014 11:33:20 GMT", "version": "v1" }, { "created": "Tue, 24 Jun 2014 09:06:44 GMT", "version": "v2" } ]
2014-07-22
[ [ "Gerasimov", "L. V.", "" ], [ "Ezhova", "V. M.", "" ], [ "Kupriyanov", "D. V.", "" ], [ "Baudouin", "Q.", "" ], [ "Guerin", "W.", "" ], [ "Kaiser", "R.", "" ] ]
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1401.6642
Siavash Ghavami
Siavash Ghavami, Vahid Rahmati, Farshad Lahouti, Lars Schwabe
Synchrony in Neuronal Communications: An Energy Efficient Scheme
6 pages, 5 figures, Accepted for publication to IWCIT 2015
null
10.1109/IWCIT.2015.7140220
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We are interested in understanding the neural correlates of attentional processes using first principles. Here we apply a recently developed first principles approach that uses transmitted information in bits per joule to quantify the energy efficiency of information transmission for an inter-spike-interval (ISI) code that can be modulated by means of the synchrony in the presynaptic population. We simulate a single compartment conductance-based model neuron driven by excitatory and inhibitory spikes from a presynaptic population, where the rate and synchrony in the presynaptic excitatory population may vary independently from the average rate. We find that for a fixed input rate, the ISI distribution of the post synaptic neuron depends on the level of synchrony and is well-described by a Gamma distribution for synchrony levels less than 50%. For levels of synchrony between 15% and 50% (restricted for technical reasons), we compute the optimum input distribution that maximizes the mutual information per unit energy. This optimum distribution shows that an increased level of synchrony, as it has been reported experimentally in attention-demanding conditions, reduces the mode of the input distribution and the excitability threshold of post synaptic neuron. This facilitates a more energy efficient neuronal communication.
[ { "created": "Sun, 26 Jan 2014 12:17:38 GMT", "version": "v1" }, { "created": "Mon, 16 Mar 2015 07:55:09 GMT", "version": "v2" } ]
2016-05-13
[ [ "Ghavami", "Siavash", "" ], [ "Rahmati", "Vahid", "" ], [ "Lahouti", "Farshad", "" ], [ "Schwabe", "Lars", "" ] ]
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1401.6650
Mark R Pederson
Mark R Pederson, Adrienn Ruzsinszky, and John P. Perdew
Self Interaction Corrected Density Functional Theory with Unitary Invariance: Applications to Molecules
null
null
null
null
cond-mat.mtrl-sci physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Standard spin-density functionals for the exchange-correlation energy of a many-electron ground state make serious self-interaction errors which can be corrected by the Perdew-Zunger self-interaction correction (SIC). We propose a size-extensive construction of SIC orbitals which, unlike earlier constructions, makes SIC computationally efficient, and a true spin-density functional. The SIC orbitals are constructed from a unitary transformation that is explicitly dependent on the non-interacting one-particle density matrix. When this SIC is applied to the local spin-density approximation, improvements are found for the atomization energies of molecules.
[ { "created": "Sun, 26 Jan 2014 13:58:27 GMT", "version": "v1" } ]
2014-01-28
[ [ "Pederson", "Mark R", "" ], [ "Ruzsinszky", "Adrienn", "" ], [ "Perdew", "John P.", "" ] ]
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1401.6651
Lin Tie
Lin Tie
On Near-controllability, Nearly-controllable Subspaces, and Near-controllability Index of a Class of Discrete-time Bilinear Systems: A Root Locus Approach
22 pages, submitted to SIAM Journal on Control and Optimization Sep. 26, 2012; revised Jul.10, 2013; accepted Dec. 19, 2013
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null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies near-controllability of a class of discrete-time bilinear systems via a root locus approach. A necessary and sufficient criterion for the systems to be nearly controllable is given. In particular, by using the root locus approach, the control inputs which achieve the state transition for the nearly controllable systems can be computed. Furthermore, for the non-nearly controllable systems, nearly-controllable subspaces are derived and near-controllability index is defined. Accordingly, the controllability properties of such class of discrete-time bilinear systems are fully characterized. Finally, examples are provided to demonstrate the results of the paper.
[ { "created": "Sun, 26 Jan 2014 14:01:43 GMT", "version": "v1" }, { "created": "Thu, 6 Feb 2014 07:57:40 GMT", "version": "v2" } ]
2014-02-07
[ [ "Tie", "Lin", "" ] ]
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1401.6653
Wojciech Gieszczyk Ph.D.
W. Gieszczyk, P. Bilski, P. Olko, B. Obryk
Radial distribution of dose within heavy charged particle tracks. Models and experimental verification using LiF:Mg,Cu,P TL detectors
Data contained within this manuscript have been presented during the 17th International Conference on Solid State Dosimetry, 22-27 September 2013, Recife, Brazil
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physics.ins-det physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new method of experimental verification of radial dose distribution models using solid state thermoluminescent (TL) detectors LiF:Mg,Cu,P has been recently proposed. In this work the method was applied to verify the spatial distribution of energy deposition within a single 131Xe ion track. Detectors were irradiated at the Department of Physics of the University of Jyv\"askyl\"a, Finland. The obtained results have been compared with theoretical data, calculated according to the Zhang et al., Cucinotta et al. and Geiss et al. radial dose distribution (RDD) models. At the lowest dose range the Zhang et al. RDD model exhibited the best agreement as compared to experimental data. In the intermediate dose range, up to 104 Gy, the best agreement was found for the RDD model of Cucinotta et al. The probability of occurrence of doses higher than 104 Gy within a single 131Xe ion track was found to be lower than predicted by all the studied RDD models. This may be a result of diffusion of the charge, which is then captured by TL-related trapping sites, at the distances up to dozens of nanometers from the ionization site.
[ { "created": "Sun, 26 Jan 2014 14:32:53 GMT", "version": "v1" } ]
2014-01-28
[ [ "Gieszczyk", "W.", "" ], [ "Bilski", "P.", "" ], [ "Olko", "P.", "" ], [ "Obryk", "B.", "" ] ]
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1401.6665
Jacques Vanneste
P. H. Haynes and J. Vanneste
Dispersion in the large-deviation regime. Part I: shear flows and periodic flows
Accepted for publication in the Journal of Fluid Mechanics
null
10.1017/jfm.2014.64
null
physics.flu-dyn cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The dispersion of a passive scalar in a fluid through the combined action of advection and molecular diffusion is often described as a diffusive process, with an effective diffusivity that is enhanced compared to the molecular value. However, this description fails to capture the tails of the scalar concentration distribution in initial-value problems. To remedy this, we develop a large-deviation theory of scalar dispersion that provides an approximation to the scalar concentration valid at much larger distances away from the centre of mass, specifically distances that are $O(t)$ rather than $O(t^{1/2})$, where $t \gg 1$ is the time from the scalar release. The theory centres on the calculation of a rate function obtained by solving a one-parameter family of eigenvalue problems which we derive using two alternative approaches, one asymptotic, the other probabilistic. We emphasise the connection between large deviations and homogenisation: a perturbative solution of the eigenvalue problems reduces at leading order to the cell problem of homogenisation theory. We consider two classes of flows in some detail: shear flows and cellular flows. In both cases, large deviation generalises classical results on effective diffusivity and captures new phenomena relevant to the tails of the scalar distribution. These include approximately finite dispersion speeds arising at large P\'eclet number $\mathrm{Pe}$ (corresponding to small molecular diffusivity) and, for two-dimensional cellular flows, anisotropic dispersion. Explicit asymptotic results are obtained for shear flows in the limit of large $\mathrm{Pe}$. (A companion paper, Part II, is devoted to the large-$\mathrm{Pe}$ asymptotic treatment of cellular flows.) The predictions of large-deviation theory are compared with Monte Carlo simulations that estimate the tails of concentration accurately using importance sampling.
[ { "created": "Sun, 26 Jan 2014 16:21:34 GMT", "version": "v1" } ]
2015-06-18
[ [ "Haynes", "P. H.", "" ], [ "Vanneste", "J.", "" ] ]
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1401.6666
Jacques Vanneste
P. H. Haynes and J. Vanneste
Dispersion in the large-deviation regime. Part II: cellular flow at large P\'eclet number
Accepted for publication in the Journal of Fluid Mechanics
null
10.1017/jfm.2014.65
null
physics.flu-dyn cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A standard model for the study of scalar dispersion through advection and molecular diffusion is a two-dimensional periodic flow with closed streamlines inside periodic cells. Over long time scales, the dispersion of a scalar in this flow can be characterised by an effective diffusivity that is a factor $\mathrm{Pe}^{1/2}$ larger than molecular diffusivity when the P\'eclet number $\mathrm{Pe}$ is large. Here we provide a more complete description of dispersion in this regime by applying the large-deviation theory developed in Part I of this paper. We derive approximations to the rate function governing the scalar concentration at large time $t$ by carrying out an asymptotic analysis of the relevant family of eigenvalue problems. We identify two asymptotic regimes and make predictions for the rate function and spatial structure of the scalar. Regime I applies to distances from the release point that satisfy $|\boldsymbol{x}| = O(\mathrm{Pe}^{1/4} t)$ . The concentration in this regime is isotropic at large scales, is uniform along streamlines within each cell, and varies rapidly in boundary layers surrounding the separatrices between adjacent cells. The results of homogenisation theory are recovered from our analysis. Regime II applies when $|\boldsymbol{x}|=O(\mathrm{Pe} \, t/\log \mathrm{Pe})$ and is characterised by an anisotropic concentration distribution that is localised around the separatrices. A novel feature of this regime is the crucial role played by the dynamics near the hyperbolic stagnation points. A consequence is that in part of the regime the dispersion can be interpreted as resulting from a random walk on the lattice of stagnation points. The two regimes overlap so that our asymptotic results describe the scalar concentration over a large range of distances. They are verified against numerical solutions of the family of eigenvalue problems yielding the rate function.
[ { "created": "Sun, 26 Jan 2014 16:48:03 GMT", "version": "v1" } ]
2015-06-18
[ [ "Haynes", "P. H.", "" ], [ "Vanneste", "J.", "" ] ]
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1401.6667
Mustafa Elsheikh
Mustafa Elsheikh, Andy Novocin, Mark Giesbrecht
Ranks of Quotients, Remainders and $p$-Adic Digits of Matrices
8 pages
null
null
null
math.NT cs.SC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For a prime $p$ and a matrix $A \in \mathbb{Z}^{n \times n}$, write $A$ as $A = p (A \,\mathrm{quo}\, p) + (A \,\mathrm{rem}\, p)$ where the remainder and quotient operations are applied element-wise. Write the $p$-adic expansion of $A$ as $A = A^{[0]} + p A^{[1]} + p^2 A^{[2]} + \cdots$ where each $A^{[i]} \in \mathbb{Z}^{n \times n}$ has entries between $[0, p-1]$. Upper bounds are proven for the $\mathbb{Z}$-ranks of $A \,\mathrm{rem}\, p$, and $A \,\mathrm{quo}\, p$. Also, upper bounds are proven for the $\mathbb{Z}/p\mathbb{Z}$-rank of $A^{[i]}$ for all $i \ge 0$ when $p = 2$, and a conjecture is presented for odd primes.
[ { "created": "Sun, 26 Jan 2014 16:50:00 GMT", "version": "v1" }, { "created": "Fri, 31 Jan 2014 16:46:50 GMT", "version": "v2" } ]
2014-02-03
[ [ "Elsheikh", "Mustafa", "" ], [ "Novocin", "Andy", "" ], [ "Giesbrecht", "Mark", "" ] ]
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1401.6669
No\'e Jim\'enez
No\'e Jim\'enez, Javier Redondo, V\'ictor S\'anchez-Morcillo, Francisco Camarena, Yi Hou, Elisa E. Konofagou
Nonlinear Acoustics FDTD method including Frequency Power Law Attenuation for Soft Tissue Modeling
null
null
null
null
physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper describes a model for nonlinear acoustic wave propagation through absorbing and weakly dispersive media, and its numerical solution by means of finite differences in time domain method (FDTD). The attenuation is based on multiple relaxation processes, and provides frequency dependent absorption and dispersion without using computational expensive convolutional operators. In this way, by using an optimization algorithm the coefficients for the relaxation processes can be obtained in order to fit a frequency power law that agrees the experimentally measured attenuation data for heterogeneous media over the typical frequency range for ultrasound medical applications. Our results show that two relaxation processes are enough to fit attenuation data for most soft tissues in this frequency range including the fundamental and the first ten harmonics. Furthermore, this model can fit experimental attenuation data that do not follow exactly a frequency power law over the frequency range of interest. The main advantage of the proposed method is that only one auxiliary field per relaxation process is needed, which implies less computational resources compared with time-domain fractional derivatives solvers based on convolutional operators.
[ { "created": "Sun, 26 Jan 2014 16:59:44 GMT", "version": "v1" } ]
2014-01-28
[ [ "Jiménez", "Noé", "" ], [ "Redondo", "Javier", "" ], [ "Sánchez-Morcillo", "Víctor", "" ], [ "Camarena", "Francisco", "" ], [ "Hou", "Yi", "" ], [ "Konofagou", "Elisa E.", "" ] ]
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1401.6670
Peter Babarczi
Peter Babarczi, Janos Tapolcai, Lajos Ronyai, Muriel Medard
Resilient Flow Decomposition of Unicast Connections with Network Coding
submitted to IEEE International Symposium on Information Theory (ISIT) 2014
null
10.1109/ISIT.2014.6874806
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we close the gap between end-to-end diversity coding and intra-session network coding for unicast connections resilient against single link failures. In particular, we show that coding operations are sufficient to perform at the source and receiver if the user data can be split into at most two parts over the filed GF(2). Our proof is purely combinatorial and based on standard graph and network flow techniques. It is a linear time construction that defines the route of subflows A, B and A+B between the source and destination nodes. The proposed resilient flow decomposition method generalizes the 1+1 protection and the end-to-end diversity coding approaches while keeping both of their benefits. It provides a simple yet resource efficient protection method feasible in 2-connected backbone topologies. Since the core switches do not need to be modified, this result can bring benefits to current transport networks.
[ { "created": "Sun, 26 Jan 2014 17:25:16 GMT", "version": "v1" } ]
2014-09-15
[ [ "Babarczi", "Peter", "" ], [ "Tapolcai", "Janos", "" ], [ "Ronyai", "Lajos", "" ], [ "Medard", "Muriel", "" ] ]
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1401.6673
Antonio Perreca
Antonio Perreca, James Lough, David Kelley, and Stefan W. Ballmer
Multidimensional optical trapping of a mirror
12 pages, 7 figures
Phys. Rev. D 89, 122002 (2014)
10.1103/PhysRevD.89.122002
LIGO-P1300224
physics.ins-det physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Alignment control in gravitational-wave detectors has consistently proven to be a difficult problem due to the stringent noise contamination requirement for the gravitational wave readout and the radiation-pressure-induced angular instability in Fabry-Perot cavities (Sidles-Sigg instability). We present the analysis of a dual-carrier control scheme that uses radiation pressure to control a suspended mirror, trapping it in the longitudinal degree of freedom and one angular degree of freedom. We show that this scheme can control the Sidles-Sigg angular instability. Its limiting fundamental noise source is the quantum radiation pressure noise, providing an advantage compared to the conventional angular control schemes. In the Appendix we also derive an exact expression for the optical spring constant used in the control scheme.
[ { "created": "Sun, 26 Jan 2014 17:53:29 GMT", "version": "v1" }, { "created": "Fri, 6 Jun 2014 22:28:28 GMT", "version": "v2" } ]
2014-06-10
[ [ "Perreca", "Antonio", "" ], [ "Lough", "James", "" ], [ "Kelley", "David", "" ], [ "Ballmer", "Stefan W.", "" ] ]
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1401.6675
Damien Pous
Filippo Bonchi (LIP), Daniela Petrisan (LIP), Damien Pous (LIP), Jurriaan Rot (LIACS)
Coinduction up to in a fibrational setting
null
CSL-LICS, Vienne : France (2014)
10.1145/2603088.2603149
null
cs.LO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bisimulation up-to enhances the coinductive proof method for bisimilarity, providing efficient proof techniques for checking properties of different kinds of systems. We prove the soundness of such techniques in a fibrational setting, building on the seminal work of Hermida and Jacobs. This allows us to systematically obtain up-to techniques not only for bisimilarity but for a large class of coinductive predicates modelled as coalgebras. By tuning the parameters of our framework, we obtain novel techniques for unary predicates and nominal automata, a variant of the GSOS rule format for similarity, and a new categorical treatment of weak bisimilarity.
[ { "created": "Sun, 26 Jan 2014 18:20:05 GMT", "version": "v1" }, { "created": "Thu, 15 May 2014 18:22:18 GMT", "version": "v2" } ]
2014-05-16
[ [ "Bonchi", "Filippo", "", "LIP" ], [ "Petrisan", "Daniela", "", "LIP" ], [ "Pous", "Damien", "", "LIP" ], [ "Rot", "Jurriaan", "", "LIACS" ] ]
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1401.6679
Robert Jeansoulin
Robert Jeansoulin and Nic Wilson
Quality of Geographic Information: Ontological approach and Artificial Intelligence Tools
12 pages, 8th EC-GIS Workshop (European Commission), Dublin, Ireland, July, 3-5, 2002
null
null
null
cs.AI cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The objective is to present one important aspect of the European IST-FET project "REV!GIS"1: the methodology which has been developed for the translation (interpretation) of the quality of the data into a "fitness for use" information, that we can confront to the user needs in its application. This methodology is based upon the notion of "ontologies" as a conceptual framework able to capture the explicit and implicit knowledge involved in the application. We do not address the general problem of formalizing such ontologies, instead, we rather try to illustrate this with three applications which are particular cases of the more general "data fusion" problem. In each application, we show how to deploy our methodology, by comparing several possible solutions, and we try to enlighten where are the quality issues, and what kind of solution to privilege, even at the expense of a highly complex computational approach. The expectation of the REV!GIS project is that computationally tractable solutions will be available among the next generation AI tools.
[ { "created": "Sun, 26 Jan 2014 18:52:05 GMT", "version": "v1" } ]
2015-01-21
[ [ "Jeansoulin", "Robert", "" ], [ "Wilson", "Nic", "" ] ]
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1401.6681
Daniel Reichman
Uriel Feige, Jonathan Hermon, Daniel Reichman
On giant components and treewidth in the layers model
null
Random Structures Algorithms 48 (2016), no. 3, 524--545
10.1002/rsa.20597
MR3481272
cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given an undirected $n$-vertex graph $G(V,E)$ and an integer $k$, let $T_k(G)$ denote the random vertex induced subgraph of $G$ generated by ordering $V$ according to a random permutation $\pi$ and including in $T_k(G)$ those vertices with at most $k-1$ of their neighbors preceding them in this order. The distribution of subgraphs sampled in this manner is called the \emph{layers model with parameter} $k$. The layers model has found applications in studying $\ell$-degenerate subgraphs, the design of algorithms for the maximum independent set problem, and in bootstrap percolation. In the current work we expand the study of structural properties of the layers model. We prove that there are $3$-regular graphs $G$ for which with high probability $T_3(G)$ has a connected component of size $\Omega(n)$. Moreover, this connected component has treewidth $\Omega(n)$. This lower bound on the treewidth extends to many other random graph models. In contrast, $T_2(G)$ is known to be a forest (hence of treewidth~1), and we establish that if $G$ is of bounded degree then with high probability the largest connected component in $T_2(G)$ is of size $O(\log n)$. We also consider the infinite two-dimensional grid, for which we prove that the first four layers contain a unique infinite connected component with probability $1$.
[ { "created": "Sun, 26 Jan 2014 19:38:38 GMT", "version": "v1" }, { "created": "Thu, 6 Feb 2014 19:10:43 GMT", "version": "v2" } ]
2018-01-29
[ [ "Feige", "Uriel", "" ], [ "Hermon", "Jonathan", "" ], [ "Reichman", "Daniel", "" ] ]
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1401.6683
Monowar Hasan
Monowar Hasan, Ekram Hossain, and Dong In Kim
Resource Allocation Under Channel Uncertainties for Relay-Aided Device-to-Device Communication Underlaying LTE-A Cellular Networks
IEEE Transactions on Wireless Communications, to appear
null
10.1109/TWC.2014.031314.131651
null
cs.NI cs.IT math.IT math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Device-to-device (D2D) communication in cellular networks allows direct transmission between two cellular devices with local communication needs. Due to the increasing number of autonomous heterogeneous devices in future mobile networks, an efficient resource allocation scheme is required to maximize network throughput and achieve higher spectral efficiency. In this paper, performance of network-integrated D2D communication under channel uncertainties is investigated where D2D traffic is carried through relay nodes. Considering a multi-user and multi-relay network, we propose a robust distributed solution for resource allocation with a view to maximizing network sum-rate when the interference from other relay nodes and the link gains are uncertain. An optimization problem is formulated for allocating radio resources at the relays to maximize end-to-end rate as well as satisfy the quality-of-service (QoS) requirements for cellular and D2D user equipments under total power constraint. Each of the uncertain parameters is modeled by a bounded distance between its estimated and bounded values. We show that the robust problem is convex and a gradient-aided dual decomposition algorithm is applied to allocate radio resources in a distributed manner. Finally, to reduce the cost of robustness defined as the reduction of achievable sum-rate, we utilize the \textit{chance constraint approach} to achieve a trade-off between robustness and optimality. The numerical results show that there is a distance threshold beyond which relay-aided D2D communication significantly improves network performance when compared to direct communication between D2D peers.
[ { "created": "Sun, 26 Jan 2014 19:52:30 GMT", "version": "v1" } ]
2016-11-15
[ [ "Hasan", "Monowar", "" ], [ "Hossain", "Ekram", "" ], [ "Kim", "Dong In", "" ] ]
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1401.6686
Siamak Ravanbakhsh
Siamak Ravanbakhsh, Russell Greiner
Perturbed Message Passing for Constraint Satisfaction Problems
null
JMLR 16(Jul):1249-1274, 2015
null
null
cs.AI cs.CC stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce an efficient message passing scheme for solving Constraint Satisfaction Problems (CSPs), which uses stochastic perturbation of Belief Propagation (BP) and Survey Propagation (SP) messages to bypass decimation and directly produce a single satisfying assignment. Our first CSP solver, called Perturbed Blief Propagation, smoothly interpolates two well-known inference procedures; it starts as BP and ends as a Gibbs sampler, which produces a single sample from the set of solutions. Moreover we apply a similar perturbation scheme to SP to produce another CSP solver, Perturbed Survey Propagation. Experimental results on random and real-world CSPs show that Perturbed BP is often more successful and at the same time tens to hundreds of times more efficient than standard BP guided decimation. Perturbed BP also compares favorably with state-of-the-art SP-guided decimation, which has a computational complexity that generally scales exponentially worse than our method (wrt the cardinality of variable domains and constraints). Furthermore, our experiments with random satisfiability and coloring problems demonstrate that Perturbed SP can outperform SP-guided decimation, making it the best incomplete random CSP-solver in difficult regimes.
[ { "created": "Sun, 26 Jan 2014 20:32:35 GMT", "version": "v1" }, { "created": "Thu, 22 Jan 2015 00:05:44 GMT", "version": "v2" }, { "created": "Tue, 3 Feb 2015 00:13:28 GMT", "version": "v3" } ]
2016-01-05
[ [ "Ravanbakhsh", "Siamak", "" ], [ "Greiner", "Russell", "" ] ]
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1401.6690
Maha Alodeh
Maha Alodeh, Symeon Chatzinotas, Bjorn Ottersten
Spatial DCT-Based Channel Estimation in Multi-Antenna Multi-Cell Interference Channels
Submitted for possible publication. arXiv admin note: text overlap with arXiv:1203.5924 by other authors
IEEE Transactions on Signal Processing, (Volume:63 , Issue: 6 ), pp.1404 - 1418, March 2015
10.1109/TSP.2015.2393844
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work addresses channel estimation in multiple antenna multicell interference-limited networks. Channel state information (CSI) acquisition is vital for interference mitigation. Wireless networks often suffer from multicell interference, which can be mitigated by deploying beamforming to spatially direct the transmissions. The accuracy of the estimated CSI plays an important role in designing accurate beamformers that can control the amount of interference created from simultaneous spatial transmissions to mobile users. Therefore, a new technique based on the structure of the spatial covariance matrix and the discrete cosine transform (DCT) is proposed to enhance channel estimation in the presence of interference. Bayesian estimation and Least Squares estimation frameworks are introduced by utilizing the DCT to separate the overlapping spatial paths that create the interference. The spatial domain is thus exploited to mitigate the contamination which is able to discriminate across interfering users. Gains over conventional channel estimation techniques are presented in our simulations which are also valid for a small number of antennas.
[ { "created": "Sun, 26 Jan 2014 20:58:02 GMT", "version": "v1" }, { "created": "Fri, 8 May 2015 08:46:49 GMT", "version": "v2" } ]
2015-05-11
[ [ "Alodeh", "Maha", "" ], [ "Chatzinotas", "Symeon", "" ], [ "Ottersten", "Bjorn", "" ] ]
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1401.6693
Igor Kreslo E.
A.Blatter, A.Ereditato, C.-C.Hsu, S.Janos, I.Kreslo, M.Luethi, C.Rudolf von Rohr, M.Schenk, T.Strauss, M.S.Weber and M.Zeller
Experimental study of electric breakdowns in liquid argon at centimeter scale
null
JINST 9 (2014) P04006
10.1088/1748-0221/9/04/P04006
null
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we present results on measurements of the dielectric strength of liquid argon near its boiling point and cathode-anode distances in the range of 0.1 mm to 40 mm with spherical cathode and plane anode. We show that at such distances the applied electric field at which breakdowns occur is as low as 40 kV/cm. Flash-overs across the ribbed dielectric of the high voltage feed-through are observed for a length of 300 mm starting from a voltage of 55 kV. These results contribute to set reference for the breakdown-free design of ionization detectors, such as Liquid Argon Time Projection Chambers (LAr TPC).
[ { "created": "Sun, 26 Jan 2014 21:24:33 GMT", "version": "v1" }, { "created": "Tue, 11 Feb 2014 09:33:51 GMT", "version": "v2" } ]
2014-11-18
[ [ "Blatter", "A.", "" ], [ "Ereditato", "A.", "" ], [ "Hsu", "C. -C.", "" ], [ "Janos", "S.", "" ], [ "Kreslo", "I.", "" ], [ "Luethi", "M.", "" ], [ "von Rohr", "C. Rudolf", "" ], [ "Schenk", "M.", "" ], [ "Strauss", "T.", "" ], [ "Weber", "M. S.", "" ], [ "Zeller", "M.", "" ] ]
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1401.6694
Daniel Roche
Andrew Arnold, Daniel S. Roche
Multivariate sparse interpolation using randomized Kronecker substitutions
21 pages, 2 tables, 1 procedure. Accepted to ISSAC 2014
null
null
null
cs.SC cs.DS cs.MS
http://creativecommons.org/licenses/publicdomain/
We present new techniques for reducing a multivariate sparse polynomial to a univariate polynomial. The reduction works similarly to the classical and widely-used Kronecker substitution, except that we choose the degrees randomly based on the number of nonzero terms in the multivariate polynomial, that is, its sparsity. The resulting univariate polynomial often has a significantly lower degree than the Kronecker substitution polynomial, at the expense of a small number of term collisions. As an application, we give a new algorithm for multivariate interpolation which uses these new techniques along with any existing univariate interpolation algorithm.
[ { "created": "Sun, 26 Jan 2014 21:37:51 GMT", "version": "v1" }, { "created": "Fri, 2 May 2014 05:01:05 GMT", "version": "v2" } ]
2014-05-05
[ [ "Arnold", "Andrew", "" ], [ "Roche", "Daniel S.", "" ] ]
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1401.6697
Yuli Ye
Allan Borodin, Dai Tri Man Le and Yuli Ye
Weakly Submodular Functions
null
null
null
null
cs.DM cs.DS math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Submodular functions are well-studied in combinatorial optimization, game theory and economics. The natural diminishing returns property makes them suitable for many applications. We study an extension of monotone submodular functions, which we call {\em weakly submodular functions}. Our extension includes some (mildly) supermodular functions. We show that several natural functions belong to this class and relate our class to some other recent submodular function extensions. We consider the optimization problem of maximizing a weakly submodular function subject to uniform and general matroid constraints. For a uniform matroid constraint, the "standard greedy algorithm" achieves a constant approximation ratio where the constant (experimentally) converges to 5.95 as the cardinality constraint increases. For a general matroid constraint, a simple local search algorithm achieves a constant approximation ratio where the constant (analytically) converges to 10.22 as the rank of the matroid increases.
[ { "created": "Sun, 26 Jan 2014 21:48:39 GMT", "version": "v1" }, { "created": "Wed, 2 Apr 2014 03:11:01 GMT", "version": "v2" }, { "created": "Mon, 21 Jul 2014 03:22:36 GMT", "version": "v3" }, { "created": "Wed, 30 Jul 2014 16:26:22 GMT", "version": "v4" }, { "created": "Sun, 16 Nov 2014 23:46:08 GMT", "version": "v5" } ]
2014-11-18
[ [ "Borodin", "Allan", "" ], [ "Le", "Dai Tri Man", "" ], [ "Ye", "Yuli", "" ] ]
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1401.6702
Kundan Kandhway
Kundan Kandhway and Joy Kuri
How to Run a Campaign: Optimal Control of SIS and SIR Information Epidemics
Proofs for Theorems 4.2 and 5.2 which do not appear in the published journal version are included in this version. Published version can be accessed here: http://dx.doi.org/10.1016/j.amc.2013.12.164
Applied Mathematics and Computation, Vol 231, March 2014, pages 79-92
10.1016/j.amc.2013.12.164
null
cs.SY cs.SI math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Information spreading in a population can be modeled as an epidemic. Campaigners (e.g. election campaign managers, companies marketing products or movies) are interested in spreading a message by a given deadline, using limited resources. In this paper, we formulate the above situation as an optimal control problem and the solution (using Pontryagin's Maximum Principle) prescribes an optimal resource allocation over the time of the campaign. We consider two different scenarios --- in the first, the campaigner can adjust a direct control (over time) which allows her to recruit individuals from the population (at some cost) to act as spreaders for the Susceptible-Infected-Susceptible (SIS) epidemic model. In the second case, we allow the campaigner to adjust the effective spreading rate by incentivizing the infected in the Susceptible-Infected-Recovered (SIR) model, in addition to the direct recruitment. We consider time varying information spreading rate in our formulation to model the changing interest level of individuals in the campaign, as the deadline is reached. In both the cases, we show the existence of a solution and its uniqueness for sufficiently small campaign deadlines. For the fixed spreading rate, we show the effectiveness of the optimal control strategy against the constant control strategy, a heuristic control strategy and no control. We show the sensitivity of the optimal control to the spreading rate profile when it is time varying.
[ { "created": "Sun, 26 Jan 2014 22:17:34 GMT", "version": "v1" } ]
2014-01-28
[ [ "Kandhway", "Kundan", "" ], [ "Kuri", "Joy", "" ] ]
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1401.6704
Takeshi Fukuyama
Takeshi Fukuyama
Chiral Molecule in the Standard Model
14 pages. Comments on the relations among chirality, electric dipole moment, and natural optical activity are added
Mod. Phys. Lett. A, Vol. 29, No. 11 (2014)
10.1142/S0217732314500564
null
hep-ph physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This review is based on the talk in the conference of "Spectroscopic Studies on Molecular Chirality" held on Dec 20-21 2013. The objects of the present paper are to (1) derive the energy difference between Laevorotatory, or left-handed, (L-) and Dextrotatory, or right-handed, (D-) molecules and to (2) discuss how this tiny energy difference leads us to the observed enantiomer excess. Relations with other parity violating phenomena in molecules, electric dipole moment and natural optical activity, are also discussed.
[ { "created": "Sun, 26 Jan 2014 23:01:20 GMT", "version": "v1" }, { "created": "Mon, 10 Feb 2014 08:59:43 GMT", "version": "v2" }, { "created": "Fri, 28 Feb 2014 13:17:35 GMT", "version": "v3" } ]
2014-04-02
[ [ "Fukuyama", "Takeshi", "" ] ]
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1401.6706
Laszlo Gyongyosi
Laszlo Gyongyosi, Sandor Imre
Theory of Quantum Gravity Information Processing
null
Quantum Eng. 1, 4:e23 (2019)
10.1002/que2.23
null
quant-ph cs.IT gr-qc hep-th math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The theory of quantum gravity is aimed to fuse general relativity with quantum theory into a more fundamental framework. The space of quantum gravity provides both the non-fixed causality of general relativity and the quantum uncertainty of quantum mechanics. In a quantum gravity scenario, the causal structure is indefinite and the processes are causally non-separable. Here, we provide a model for the information processing structure of quantum gravity. We show that the quantum gravity environment is an information resource-pool from which valuable information can be extracted. We analyze the structure of the quantum gravity space and the entanglement of the space-time geometry. We study the information transfer capabilities of quantum gravity space and define the quantum gravity channel. We reveal that the quantum gravity space acts as a background noise on the local environment states. We characterize the properties of the noise of the quantum gravity space and show that it allows the separate local parties to simulate remote outputs from the local environment state, through the process of remote simulation.
[ { "created": "Sun, 26 Jan 2014 23:13:31 GMT", "version": "v1" }, { "created": "Wed, 26 Mar 2014 11:56:45 GMT", "version": "v2" }, { "created": "Wed, 11 Mar 2020 11:45:32 GMT", "version": "v3" } ]
2020-03-12
[ [ "Gyongyosi", "Laszlo", "" ], [ "Imre", "Sandor", "" ] ]
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1401.6716
Ian Beatty
Ian D. Beatty
Gaming the System: Video Games as a Theoretical Framework for Instructional Design
Proposed for a conference paper presentation at the International Conference of the Learning Sciences 2014 (Boulder, CO)
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physics.ed-ph cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In order to facilitate analyzing video games as learning systems and instructional designs as games, we present a theoretical framework that integrates ideas from a broad range of literature. The framework describes games in terms of four layers, all sharing similar structural elements and dynamics: a micro-level game focused on immediate problem-solving and skill development, a macro-level game focused on the experience of the game world and story and identity development, and two meta-level games focused on building or modifying the game and on social interactions around it. Each layer casts gameplay as a co-construction of the game and the player, and contains three dynamical feedback loops: an exploratory learning loop, an intrinsic motivation loop, and an identity loop.
[ { "created": "Mon, 27 Jan 2014 02:05:30 GMT", "version": "v1" } ]
2014-01-28
[ [ "Beatty", "Ian D.", "" ] ]
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1401.6720
Charith Perera
Charith Perera and Arkady Zaslavsky
Improve the Sustainability of Internet of Things Through Trading-based Value Creation
arXiv admin note: substantial text overlap with arXiv:1307.8198
Proceedings of the IEEE World Forum on Internet of Things (WF-IoT), Seoul, Korea, March, 2014
null
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Internet of Things (IoT) has been widely discussed over the past few years in technology point of view. However, the social aspects of IoT are seldom studied to date. In this paper, we discuss the IoT in social point of view. Specifically, we examine the strategies to increase the adoption of IoT in a sustainable manner. Such discussion is essential in today's context where adoption of IoT solutions by non-technical community is slow. Specially, large number of IoT solutions making their way into the market every day. We propose an trading-based value creation model based on sensing as a service paradigm in order to fuel the adoption of IoT. We discuss the value creation and its impact towards the society especially to households and their occupants. We also present results of two different surveys we conducted in order to examine the potential acceptance of the proposed model among the general public.
[ { "created": "Mon, 27 Jan 2014 02:25:51 GMT", "version": "v1" } ]
2014-01-28
[ [ "Perera", "Charith", "" ], [ "Zaslavsky", "Arkady", "" ] ]
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1401.6723
Jonathan Squire
Jonathan Squire and Hong Qin and William M. Tang
Geometric integration of the Vlasov-Maxwell system with a variational particle-in-cell scheme
null
Physics of Plasmas 19, 084501 (2012)
10.1063/1.4742985
null
physics.plasm-ph physics.acc-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A fully variational, unstructured, electromagnetic particle-in-cell integrator is developed for integration of the Vlasov-Maxwell equations. Using the formalism of Discrete Exterior Calculus, the field solver, interpolation scheme and particle advance algorithm are derived through minimization of a single discrete field theory action. As a consequence of ensuring that the action is invariant under discrete electromagnetic gauge transformations, the integrator exactly conserves Gauss's law.
[ { "created": "Mon, 27 Jan 2014 02:44:06 GMT", "version": "v1" } ]
2015-06-18
[ [ "Squire", "Jonathan", "" ], [ "Qin", "Hong", "" ], [ "Tang", "William M.", "" ] ]
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1401.6725
Jonathan Squire
Jonathan Squire and Hong Qin and William M. Tang
Gauge properties of the guiding center variational symplectic integrator
null
Physics of Plasmas 19, 2501 (2012)
10.1063/1.4714608
null
physics.plasm-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Variational symplectic algorithms have recently been developed for carrying out long-time simulation of charged particles in magnetic fields. As a direct consequence of their derivation from a discrete variational principle, these algorithms have very good long-time energy conservation, as well as exactly preserving discrete momenta. We present stability results for these algorithms, focusing on understanding how explicit variational integrators can be designed for this type of system. It is found that for explicit algorithms an instability arises because the discrete symplectic structure does not become the continuous structure in the $t \rightarrow 0$ limit. We examine how a generalized gauge transformation can be used to put the Lagrangian in the "antisymmetric discretization gauge," in which the discrete symplectic structure has the correct form, thus eliminating the numerical instability. Finally, it is noted that the variational guiding center algorithms are not electromagnetically gauge invariant. By designing a model discrete Lagrangian, we show that the algorithms are approximately gauge invariant as long as $\boldsymbol{A}$ and $\phi$ are relatively smooth. A gauge invariant discrete Lagrangian is very important in a variational particle-in-cell algorithm where it ensures current continuity and preservation of Gauss's law
[ { "created": "Mon, 27 Jan 2014 02:58:17 GMT", "version": "v1" } ]
2015-06-18
[ [ "Squire", "Jonathan", "" ], [ "Qin", "Hong", "" ], [ "Tang", "William M.", "" ] ]
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1401.6726
Earlence T Fernandes
Earlence Fernandes, Alexander Crowell, Ajit Aluri and Atul Prakash
Anception: Application Virtualization For Android
University of Michigan, Technical Report CSE-TR-583-13
null
null
CSE-TR-583-13
cs.CR cs.OS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The problem of malware has become significant on Android devices. Library operating systems and application virtualization are both possible solutions for confining malware. Unfortunately, such solutions do not exist for Android. Designing mechanisms for application virtualization is a significant chal- lenge for several reasons: (1) graphics performance is important due to popularity of games and (2) applications with the same UID can share state. This paper presents Anception, the first flexible application virtualization framework for Android. It is imple- mented as a modification to the Android kernel and supports application virtualization that addresses the above requirements. Anception is able to confine many types of malware while supporting unmodified Android applications. Our Anception- based system exhibits up to 3.9% overhead on various 2D/3D benchmarks, and 1.8% overhead on the SunSpider benchmark.
[ { "created": "Mon, 27 Jan 2014 03:01:33 GMT", "version": "v1" } ]
2014-01-28
[ [ "Fernandes", "Earlence", "" ], [ "Crowell", "Alexander", "" ], [ "Aluri", "Ajit", "" ], [ "Prakash", "Atul", "" ] ]
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1401.6728
Junekey Jeon
Junekey Jeon
A Generalized Typicality for Abstract Alphabets
44 pages; submitted to IEEE Transactions on Information Theory
null
10.1109/ISIT.2014.6875314
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new notion of typicality for arbitrary probability measures on standard Borel spaces is proposed, which encompasses the classical notions of weak and strong typicality as special cases. Useful lemmas about strong typical sets, including conditional typicality lemma, joint typicality lemma, and packing and covering lemmas, which are fundamental tools for deriving many inner bounds of various multi-terminal coding problems, are obtained in terms of the proposed notion. This enables us to directly generalize lots of results on finite alphabet problems to general problems involving abstract alphabets, without any complicated additional arguments. For instance, quantization procedure is no longer necessary to achieve such generalizations. Another fundamental lemma, Markov lemma, is also obtained but its scope of application is quite limited compared to others. Yet, an alternative theory of typical sets for Gaussian measures, free from this limitation, is also developed. Some remarks on a possibility to generalize the proposed notion for sources with memory are also given.
[ { "created": "Mon, 27 Jan 2014 03:13:37 GMT", "version": "v1" }, { "created": "Tue, 28 Jan 2014 03:58:56 GMT", "version": "v2" }, { "created": "Mon, 12 May 2014 03:46:37 GMT", "version": "v3" }, { "created": "Fri, 12 Dec 2014 12:16:35 GMT", "version": "v4" } ]
2016-11-17
[ [ "Jeon", "Junekey", "" ] ]
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1401.6733
Anthony Harkin
David Mehrle, Amy Strosser and Anthony Harkin
Walk modularity and community structure in networks
13 pages, 6 figures, 1 table
Network Science 3(03), 2015, pp 348-360
10.1017/nws.2015.20
null
physics.soc-ph cs.SI physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Modularity maximization has been one of the most widely used approaches in the last decade for discovering community structure in networks of practical interest in biology, computing, social science, statistical mechanics, and more. Modularity is a quality function that measures the difference between the number of edges found within clusters minus the number of edges one would statistically expect to find based on random chance. We present a natural generalization of modularity based on the difference between the actual and expected number of walks within clusters, which we call walk-modularity. Walk-modularity can be expressed in matrix form, and community detection can be performed by finding leading eigenvectors of the walk-modularity matrix. We demonstrate community detection on both synthetic and real-world networks and find that walk-modularity maximization returns significantly improved results compared to traditional modularity maximization.
[ { "created": "Mon, 27 Jan 2014 03:48:04 GMT", "version": "v1" } ]
2017-11-10
[ [ "Mehrle", "David", "" ], [ "Strosser", "Amy", "" ], [ "Harkin", "Anthony", "" ] ]
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1401.6734
David Conlon
David Conlon, Jacob Fox, William Gasarch, David G. Harris, Douglas Ulrich, Samuel Zbarsky
Distinct volume subsets
10 pages
null
null
null
math.CO cs.CG math.MG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Suppose that $a$ and $d$ are positive integers with $a \geq 2$. Let $h_{a,d}(n)$ be the largest integer $t$ such that any set of $n$ points in $\mathbb{R}^d$ contains a subset of $t$ points for which all the non-zero volumes of the ${t \choose a}$ subsets of order $a$ are distinct. Beginning with Erd\H{o}s in 1957, the function $h_{2,d}(n)$ has been closely studied and is known to be at least a power of $n$. We improve the best known bound for $h_{2,d}(n)$ and show that $h_{a,d}(n)$ is at least a power of $n$ for all $a$ and $d$.
[ { "created": "Mon, 27 Jan 2014 03:52:20 GMT", "version": "v1" }, { "created": "Sat, 13 Dec 2014 03:52:38 GMT", "version": "v2" }, { "created": "Sun, 10 May 2015 10:28:09 GMT", "version": "v3" } ]
2015-05-12
[ [ "Conlon", "David", "" ], [ "Fox", "Jacob", "" ], [ "Gasarch", "William", "" ], [ "Harris", "David G.", "" ], [ "Ulrich", "Douglas", "" ], [ "Zbarsky", "Samuel", "" ] ]
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1401.6736
Navid Tadayon
Navid Tadayon and Sonia Aissa
Multi-Channel Cognitive Radio Networks: Modeling, Analysis and Synthesis
Accepted in IEEE Journal on Selected Area in Communications
null
null
null
cs.NI math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this contribution, we establish a model for multichannel cognitive radio networks (CRNs) using the theory of priority queues. This model enables us to conduct a performance analysis in the most general form by the derivation of the probability mass function (PMF) of queue length at the secondary users (SUs). In the second part, a reverse problem is considered to answer the important top-down question of whether a service requirement can be satisfied in a multi-channel CRN knowing the network parameters and traffic situation with respect to the SUs and the primary users (PUs). Terming this problem as the network synthesis, a precise conservation law is obtained, which relates the packet waiting times of both types of users, and based on which the achievable region of the network is also determined. Lastly, by the introduction of a mixed strategy, the conditions for the existence of an optimal trade-off between the interference onto the PUs and the quality-of-service of the SUs is shown, and the optimal mixed strategy is obtained when those conditions are satisfied.
[ { "created": "Mon, 27 Jan 2014 04:32:02 GMT", "version": "v1" } ]
2014-01-28
[ [ "Tadayon", "Navid", "" ], [ "Aissa", "Sonia", "" ] ]
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1401.6738
Hyeji Kim
Hyeji Kim, Abbas El Gamal
Capacity Region of the Broadcast Channel with Two Deterministic Channel State Components
5 pages, 3 figures. Submitted to ISIT 2014
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cs.IT math.IT
http://creativecommons.org/licenses/by/3.0/
This paper establishes the capacity region of a class of broadcast channels with random state in which each channel component is selected from two possible functions and each receiver knows its state sequence. This channel model does not fit into any class of broadcast channels for which the capacity region was previously known and is useful in studying wireless communication channels when the fading state is known only at the receivers. The capacity region is shown to coincide with the UV outer bound and is achieved via Marton coding.
[ { "created": "Mon, 27 Jan 2014 04:36:58 GMT", "version": "v1" } ]
2014-01-28
[ [ "Kim", "Hyeji", "" ], [ "Gamal", "Abbas El", "" ] ]
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1401.6744
Prajwal Mohanmurthy
Prajwal Mohanmurthy, Dipangkar Dutta
An update on the developmental status of the Spin-Light Polarimeter for the Electron Ion Collider
7 Pages, 10 figures; XVth International Workshop on Polarized Sources, Targets, and Polarimetry
Proceedings of Science XVth International - XVth Workshop on Polarized Sources, Targets, and Polarimetry 2013
10.22323/1.182.0038
PSTP 2013 - 038
physics.acc-ph nucl-ex
http://creativecommons.org/licenses/by/3.0/
Precision experiments in the parity violating electron scattering (PVES) sector is one the leading methods to probe physics beyond the standard model (SM). A large part of the physics program being envisioned for future facilities such as the Electron Ion Collider (EIC) includes searching for physics beyond SM. Here, we present a novel technique which uses spacial asymmetry of synchrotron radiation produced by an electron beam passing through a wiggler magnet to trace the changes in beam polarization. Such a relative polarimeter could be vital if the goal of <0.5% polarimetry is to be achieved at EIC. In this paper, we update the discussion on the development of this technique supported by a Geant4 simulation. The polarimeter apparatus along with the underlying basic ideas are briefly introduced. As a part of the simulation, the effects of electron beam current and beam energy were studied which were found to be manageable over a wide range of electron beam energies and beam currents. It was found that such a relative polarimeter works best in the 4-20 GeV regime.
[ { "created": "Mon, 27 Jan 2014 05:43:14 GMT", "version": "v1" } ]
2018-10-12
[ [ "Mohanmurthy", "Prajwal", "" ], [ "Dutta", "Dipangkar", "" ] ]
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1401.6751
Nathan Hart
Nathan A. Hart, James Strohaber, Gamze Kaya, Necati Kaya, Alexandre A. Kolomenskii, Hans A. Schuessler
Intensity-Resolved Above Threshold Ionization of Xenon with Short Laser Pulses
21 pages, 7 figures
Phys. Rev. A 89, 053414 (2014)
10.1103/PhysRevA.89.053414
null
physics.optics physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present intensity-resolved above threshold ionization (ATI) spectra of xenon using an intensity scanning and deconvolution technique. Experimental data were obtained with laser pulses of 58 fs and central wavelength of 800 nm from a chirped-pulse amplifier. Applying a deconvolution algorithm, we obtained spectra that have higher contrast and are in excellent agreement with characteristic 2 $U_p$ and 10 $U_p$ cutoff energies contrary to that found for raw data. The retrieved electron ionization probability is consistent with the presence of a second electron from double ionization. This recovered ionization probability is confirmed with a calculation based on the PPT tunneling ionization model [Perelomov, Popov, and Terent'ev, Sov. Phys. JETP 23, 924 (1966)]. Thus, the measurements of photoelectron yields and the proposed deconvolution technique allowed retrieval of more accurate spectroscopic information from the ATI spectra and ionization probability features that are usually concealed by volume averaging.
[ { "created": "Mon, 27 Jan 2014 06:49:52 GMT", "version": "v1" } ]
2014-05-21
[ [ "Hart", "Nathan A.", "" ], [ "Strohaber", "James", "" ], [ "Kaya", "Gamze", "" ], [ "Kaya", "Necati", "" ], [ "Kolomenskii", "Alexandre A.", "" ], [ "Schuessler", "Hans A.", "" ] ]
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1401.6756
Bin Jiang
Bin Jiang and Yufan Miao
The Evolution of Natural Cities from the Perspective of Location-Based Social Media
14 pages, 9 figures, 5 tables
The Professional Geographer, 67(2), 295 - 306, 2015
10.1080/00330124.2014.968886
null
nlin.AO physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper examines the former location-based social medium Brightkite, over its three-year life span, based on the concept of natural cities. The term 'natural cities' refers to spatially clustered geographic events, such as the agglomerated patches aggregated from individual social media users' locations. We applied the head/tail division rule to derive natural cities, based on the fact that there are far more low-density locations than high-density locations on the earth surface. More specifically, we generated a triangulated irregular network, made up of individual unique user locations, and then categorized small triangles (smaller than an average) as natural cities for the United States (mainland) on a monthly basis. The concept of natural cities provides a powerful means to develop new insights into the evolution of real cities, because there are virtually no data available to track the history of cities across their entire life spans and at very fine spatial and temporal scales. Therefore, natural cities can act as a good proxy of real cities, in the sense of understanding underlying interactions, at a global level, rather than of predicting cities, at an individual level. Apart from the data produced and the contributed methods, we established new insights into the structure and dynamics of natural cities, e.g., the idea that natural cities evolve in nonlinear manners at both spatial and temporal dimensions. Keywords: Big data, head/tail breaks, ht-index, power laws, fractal, and nonlinearity
[ { "created": "Mon, 27 Jan 2014 07:25:54 GMT", "version": "v1" }, { "created": "Sat, 8 Mar 2014 09:01:01 GMT", "version": "v2" }, { "created": "Sat, 22 Mar 2014 16:46:04 GMT", "version": "v3" } ]
2015-05-20
[ [ "Jiang", "Bin", "" ], [ "Miao", "Yufan", "" ] ]
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1401.6757
Tomer Koren
Elad Hazan, Tomer Koren
A Linear-Time Algorithm for Trust Region Problems
null
null
null
null
cs.DS math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the fundamental problem of maximizing a general quadratic function over an ellipsoidal domain, also known as the trust region problem. We give the first provable linear-time (in the number of non-zero entries of the input) algorithm for approximately solving this problem. Specifically, our algorithm returns an $\epsilon$-approximate solution in time $\tilde{O}(N/\sqrt{\epsilon})$, where $N$ is the number of non-zero entries in the input. This matches the runtime of Nesterov's accelerated gradient descent, suitable for the special case in which the quadratic function is concave, and the runtime of the Lanczos method which is applicable when the problem is purely quadratic.
[ { "created": "Mon, 27 Jan 2014 07:40:26 GMT", "version": "v1" } ]
2014-01-28
[ [ "Hazan", "Elad", "" ], [ "Koren", "Tomer", "" ] ]
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1401.6759
Nadia Otmani-Benmehidi
Nadia Otmani Benmehidi and Meriem Arar and Imene Chine
Modeling the behavior of reinforced concrete walls under fire, considering the impact of the span on firewalls
8 pages,12 figures, 4 tables
International Journal of Soft Computing And Software Engineering (JSCSE), Vol.3,No.3, pp. 600-607, 2013
10.7321/jscse.v3.n3.91
null
cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Numerical modeling using computers is known to present several advantages compared to experimental testing. The high cost and the amount of time required to prepare and to perform a test were among the main problems on the table when the first tools for modeling structures in fire were developed. The discipline structures-in-fire modeling is still currently the subject of important research efforts around the word, those research efforts led to develop many software. In this paper, our task is oriented to the study of fire behavior and the impact of the span reinforced concrete walls with different sections belonging to a residential building braced by a system composed of porticoes and sails. Regarding the design and mechanical loading (compression forces and moments) exerted on the walls in question, we are based on the results of a study conducted at cold. We use on this subject the software Safir witch obeys to the Eurocode laws, to realize this study. It was found that loading, heating, and sizing play a capital role in the state of failed walls. Our results justify well the use of reinforced concrete walls, acting as a firewall. Their role is to limit the spread of fire from one structure to another structure nearby, since we get fire resistance reaching more than 10 hours depending on the loading considered.
[ { "created": "Mon, 27 Jan 2014 07:50:29 GMT", "version": "v1" } ]
2014-02-18
[ [ "Benmehidi", "Nadia Otmani", "" ], [ "Arar", "Meriem", "" ], [ "Chine", "Imene", "" ] ]
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1401.6763
Tao Wei
Yuan Wang
Measure electron beam energy with the time-resolved beam parameters measurement system and magnetic analyzer mode
submitted to Chinese Physics C
null
null
null
physics.acc-ph physics.optics
http://creativecommons.org/licenses/by/3.0/
Time-resolved beam parameters measurement system can be achieve electron beam energy in LIA. In this paper introduce work principle and method of time-resolved beam parameters measurement system. Show the experiment layout of energy measuring. The principle of magnetic analyzer was described, with the bending radius of 300 mm and the bending angle of 60 degree after hard-edge approximation, The measured energy is about 18MeV, the maximum energy variation is 2%.
[ { "created": "Mon, 27 Jan 2014 08:18:16 GMT", "version": "v1" } ]
2014-01-28
[ [ "Wang", "Yuan", "" ] ]
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1401.6765
Cristian Antonelli
Anton Andrusier, Mark Shtaif, Cristian Antonelli, and Antonio Mecozzi
Assessing the effects of mode-dependent loss in space-division multiplexed systems
null
null
10.1109/JLT.2014.2303931
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mode-dependent loss (MDL) is known to be a major issue in space-division multiplexed (SMD) systems. Its effect on performance is complex as it affects both the data carrying signal and the accumulated amplification noise. In this paper we propose a procedure for characterizing the MDL of SDM systems by means of standard measurements that are routinely performed on SDM setups. The figure of merit that we present for quantifying MDL incorporates the effect on the transmitted signal and the noise and is directly related to the spectral efficiency reduction.
[ { "created": "Mon, 27 Jan 2014 08:45:30 GMT", "version": "v1" } ]
2015-06-18
[ [ "Andrusier", "Anton", "" ], [ "Shtaif", "Mark", "" ], [ "Antonelli", "Cristian", "" ], [ "Mecozzi", "Antonio", "" ] ]
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1401.6773
Gildas Morvan
Hassane Aboua\"issa and Yoann Kubera and Gildas Morvan
Dynamic Hybrid Traffic Flow Modeling
This paper reports the works conducted in 2013 during the phase 5 of CISIT within the ISART project
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cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A flow of moving agents can be observed at different scales. Thus, in traffic modeling, three levels are generally considered: the micro, meso and macro levels, representing respectively the interactions between vehicles, groups of vehicles sharing common properties (such as a common destination or a common localization) and flows of vehicles. Each approach is useful in a given context: micro and meso models allow to simulate road networks with complex topologies such as urban area, while macro models allow to develop control strategies to prevent congestion in highways. However, to simulate large-scale road networks, it can be interesting to integrate different representations, e.g., micro and macro, in a single model. Existing models share the same limitation: connections between levels are fixed a priori and cannot be changed at runtime. Therefore, to be able to observe some emerging phenomena such as congestion formation or to find the exact location of a jam in a large macro section, a dynamic hybrid modeling approach is needed. In 2013 we started the development of a multi-level agent-based simulator called JAM-FREE within the ISART project. It allows to simulate large road networks efficiently using a dynamic level of detail. This simulator relies on a multi-level agent-based modeling framework called SIMILAR.
[ { "created": "Mon, 27 Jan 2014 09:27:50 GMT", "version": "v1" } ]
2014-01-28
[ [ "Abouaïssa", "Hassane", "" ], [ "Kubera", "Yoann", "" ], [ "Morvan", "Gildas", "" ] ]
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1401.6775
Michael Hoy
Michael Hoy
Methods for Collision-Free Navigation of Multiple Mobile Robots in Unknown Cluttered Environments
308 pages
null
null
null
math.OC cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Navigation and guidance of autonomous vehicles is a fundamental problem in robotics, which has attracted intensive research in recent decades. This report is mainly concerned with provable collision avoidance of multiple autonomous vehicles operating in unknown cluttered environments, using reactive decentralized navigation laws, where obstacle information is supplied by some sensor system. Recently, robust and decentralized variants of model predictive control based navigation systems have been applied to vehicle navigation problems. Properties such as provable collision avoidance under disturbance and provable convergence to a target have been shown; however these often require significant computational and communicative capabilities, and don't consider sensor constraints, making real time use somewhat difficult. There also seems to be opportunity to develop a better trade-off between tractability, optimality, and robustness. The main contributions of this work are as follows; firstly, the integration of the robust model predictive control concept with reactive navigation strategies based on local path planning, which is applied to both holonomic and unicycle vehicle models subjected to acceleration bounds and disturbance; secondly, the extension of model predictive control type methods to situations where the information about the obstacle is limited to a discrete ray-based sensor model, for which provably safe, convergent boundary following can be shown; and thirdly the development of novel constraints allowing decentralized coordination of multiple vehicles using a robust model predictive control type approach, where a single communication exchange is used per control update, vehicles are allowed to perform planning simultaneously, and coherency objectives are avoided.
[ { "created": "Mon, 27 Jan 2014 09:39:15 GMT", "version": "v1" } ]
2014-01-28
[ [ "Hoy", "Michael", "" ] ]
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1401.6776
Fabio Pupilli
Fabio Pupilli (for the OPERA Collaboration)
Recent results of the OPERA experiment
5 pages, 2 figures. Proceedings of the 14th ICATPP Conference, 23-27 September 2013, Villa Olmo - Como (Italy)
null
10.1142/9789814603164_0044
null
hep-ex physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The OPERA experiment aims at the direct confirmation of the leading oscillation mechanism in the atmospheric sector looking for the appearance of $\nu_{\tau}$ in an almost pure $\nu_{\mu}$ beam (the CERN CNGS beam). In five years of physics run the experiment collected $17.97 \times 10^{19}$ p.o.t. The detection of $\tau$s produced in $\nu_{\tau}$ CC interactions and of their decays is accomplished exploiting the high spatial resolution of nuclear emulsions. Furthermore OPERA has good capabilities in detecting electron neutrino interactions, setting limits on the $\nu_{\mu} \rightarrow \nu_{e}$ oscillation channel. In this talk the status of the analysis will be presented together with updated results on both oscillation channels.
[ { "created": "Mon, 27 Jan 2014 09:39:20 GMT", "version": "v1" } ]
2019-08-13
[ [ "Pupilli", "Fabio", "", "for the OPERA Collaboration" ] ]
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1401.6778
Alexey Basharin A.A.
Nikolay P. Balabukha, Alexey A. Basharin, Natalia E. Shapkina
Dielectric rod feed for compact range reflector
AMTA 2012 Conference Papers
null
null
null
physics.ins-det physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A dielectric rod feed with a special radiation pattern of a tabletop form used for the compact range reflector is developed and analyzed. Application of this feed increases the size of the compact range quiet zone generated by the reflector. The feed consists of the dielectric rod made of polystyren, the rod is inserted into the circular waveguide with a corrugated flange. The waveguide is excited by the H11-mode. The rod is covered by the textolite biconical bushing and has a fluoroplastic insert in the vicinity of the bushing. Mathematical modeling was used to obtain the parameters of the feed for the optimal tabletop form of the radiation pattern. The problem of the electromagnetic radiation was solved for metal-dielectric bodies of rotation by method of integral equations with further solving of the problem of the synthesis for feed parameters. The dielectric rod feed was fabricated for the X-frequency range. Feed amplitude and phase patterns were measured in the frequency range 8.2-12.5 GHz. Presented results of mathematical modeling and measurements for X-range radiation patterns correlate well. It is shown that this feed increases by 20-25% the quiet zone of the compact range with reflector in the form of nonsymmetrical cutting of the paraboloid of revolution 5.0 x 4.5 m in size in the frequency range 8.5-10.0 GHz as compared to a conical horn feed.
[ { "created": "Mon, 27 Jan 2014 09:40:39 GMT", "version": "v1" } ]
2014-01-28
[ [ "Balabukha", "Nikolay P.", "" ], [ "Basharin", "Alexey A.", "" ], [ "Shapkina", "Natalia E.", "" ] ]
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1401.6785
Sylvain Schmitz
Ranko Lazi\'c and Sylvain Schmitz
Non-Elementary Complexities for Branching VASS, MELL, and Extensions
Fixed Fig. 3 thanks to Hiromi Tanaka
ACM Transactions on Computational Logic, vol. 16, issue 3, article 20, 2015
10.1145/2733375
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the complexity of reachability problems on branching extensions of vector addition systems, which allows us to derive new non-elementary complexity bounds for fragments and variants of propositional linear logic. We show that provability in the multiplicative exponential fragment is Tower-hard already in the affine case -- and hence non-elementary. We match this lower bound for the full propositional affine linear logic, proving its Tower-completeness. We also show that provability in propositional contractive linear logic is Ackermann-complete.
[ { "created": "Mon, 27 Jan 2014 10:09:59 GMT", "version": "v1" }, { "created": "Thu, 25 Sep 2014 14:21:45 GMT", "version": "v2" }, { "created": "Mon, 16 May 2022 20:49:22 GMT", "version": "v3" } ]
2022-05-18
[ [ "Lazić", "Ranko", "" ], [ "Schmitz", "Sylvain", "" ] ]
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1401.6787
Tobias Koch
Tobias Koch
On the capacity of the dither-quantized Gaussian channel
22 pages, 1 figure. Part of this work will be presented at ISIT 2014. Corrected minor typos
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies the capacity of the peak-and-average-power-limited Gaussian channel when its output is quantized using a dithered, infinite-level, uniform quantizer of step size $\Delta$. It is shown that the capacity of this channel tends to that of the unquantized Gaussian channel when $\Delta$ tends to zero, and it tends to zero when $\Delta$ tends to infinity. In the low signal-to-noise ratio (SNR) regime, it is shown that, when the peak-power constraint is absent, the low-SNR asymptotic capacity is equal to that of the unquantized channel irrespective of $\Delta$. Furthermore, an expression for the low-SNR asymptotic capacity for finite peak-to-average-power ratios is given and evaluated in the low- and high-resolution limit. It is demonstrated that, in this case, the low-SNR asymptotic capacity converges to that of the unquantized channel when $\Delta$ tends to zero, and it tends to zero when $\Delta$ tends to infinity. Comparing these results with achievability results for (undithered) 1-bit quantization, it is observed that the dither reduces capacity in the low-precision limit, and it reduces the low-SNR asymptotic capacity unless the peak-to-average-power ratio is unbounded.
[ { "created": "Mon, 27 Jan 2014 10:14:46 GMT", "version": "v1" }, { "created": "Wed, 26 Mar 2014 19:00:00 GMT", "version": "v2" }, { "created": "Fri, 25 Apr 2014 14:05:35 GMT", "version": "v3" } ]
2014-04-28
[ [ "Koch", "Tobias", "" ] ]
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1401.6789
Demetris Christopoulos
Demetris T. Christopoulos
Inflection point analysis for Greek seismicity 1900-2006
10 pages, 6 figures, 5 tables
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The seismicity of Greek region is studied under the prism of ESE & EDE methods for finding the inflection point of cumulative energy released. Main shocks are chosen from 106 years data. The result is that with both methods a critical time region exist at the end of 1982 to early 1983. After this time the seismicity tends to increase and gives remarkable events, like Athens Sep 1999 earthquake.
[ { "created": "Mon, 27 Jan 2014 10:16:51 GMT", "version": "v1" } ]
2014-02-27
[ [ "Christopoulos", "Demetris T.", "" ] ]
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1401.6790
Arsenia Chorti
Arsenia Chorti, Katerina Papadaki, H. Vincent Poor
Optimal Power Allocation in Block Fading Gaussian Channels with Causal CSI and Secrecy Constraints
submitted to ISIT 2014
null
null
null
cs.IT cs.CR math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The optimal power allocation that maximizes the secrecy capacity of block fading Gaussian (BF-Gaussian) networks with causal channel state information (CSI), M-block delay tolerance and a frame based power constraint is examined. In particular, we formulate the secrecy capacity maximization as a dynamic program. We propose suitable linear approximations of the secrecy capacity density in the low SNR, the high SNR and the intermediate SNR regimes, according to the overall available power budget. Our findings indicate that when the available power resources are very low (low SNR case) the optimal strategy is a threshold policy. On the other hand when the available power budget is infinite (high SNR case) a constant power policy maximizes the frame secrecy capacity. Finally, when the power budget is finite (medium SNR case), an approximate tractable power allocation policy is derived.
[ { "created": "Mon, 27 Jan 2014 10:17:04 GMT", "version": "v1" } ]
2014-01-28
[ [ "Chorti", "Arsenia", "" ], [ "Papadaki", "Katerina", "" ], [ "Poor", "H. Vincent", "" ] ]
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1401.6795
Brian Seguin
Brian Seguin and Eliot Fried
Calculating the bending moduli of the Canham--Helfrich free-energy density from a particular potential
15 pages, 3 figures. arXiv admin note: text overlap with arXiv:1211.0880
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null
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physics.bio-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Canham--Helfrich free-energy density for a lipid bilayer involves the mean and Gaussian curvatures of the midsurface of the bilayer. The splay and saddle-splay moduli $\kappa$ and $\bar\kappa$ regulate the sensitivity of the free-energy density to changes of these curvatures. Seguin and Fried derived the Canham--Helfrich energy by taking into account the interactions between the molecules comprising the bilayer, giving rise to integral representations for the moduli in terms of the interaction potential. In the present work, two potentials are chosen and the integrals are evaluated to yield expressions for the moduli, which are found to depend on parameters associated with each potential. These results are compared with values of the moduli found in the current literature.
[ { "created": "Mon, 27 Jan 2014 10:27:17 GMT", "version": "v1" }, { "created": "Sat, 21 Jun 2014 17:18:54 GMT", "version": "v2" } ]
2014-06-24
[ [ "Seguin", "Brian", "" ], [ "Fried", "Eliot", "" ] ]
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1401.6796
German Sinuco Mr
German Sinuco-Leon, Kathryn Burrows, Aidan S. Arnold, Barry M. Garraway
Inductively guided circuits for ultracold dressed atoms
7 pages, 7 pdf figures
Nature Communications 5, 5289 (2014)
10.1038/ncomms6289
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a flexible and robust scheme to create closed quasi-one dimensional guides for ultra-cold atoms through the dressing of hyperfine sub-levels of the atomic ground state. The dressing field is spatially modulated by inductive effects over a micro-engineered conducting loop, freeing the trapping region from leading wires in its proximity. We show that arrays of connected ring traps can also be created by carefully designing the shape of the conducting loop. We report on characteristics of the trap and mechanisms that limit the range of parameters available for experimental implementation, including non-adiabatic losses and heat dissipation by induced currents. We outline conditions to select appropriate parameters for operation of the trap with atom-chip technology.
[ { "created": "Mon, 27 Jan 2014 10:31:58 GMT", "version": "v1" } ]
2018-01-26
[ [ "Sinuco-Leon", "German", "" ], [ "Burrows", "Kathryn", "" ], [ "Arnold", "Aidan S.", "" ], [ "Garraway", "Barry M.", "" ] ]
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1401.6799
Dragana Bajovic
Dragana Bajovic, Dusan Jakovetic, Dejan Vukobratovic, and Vladimir Crnojevic
Slotted Aloha for Networked Base Stations
conference; submitted on Dec 15, 2013
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study multiple base station, multi-access systems in which the user-base station adjacency is induced by geographical proximity. At each slot, each user transmits (is active) with a certain probability, independently of other users, and is heard by all base stations within the distance $r$. Both the users and base stations are placed uniformly at random over the (unit) area. We first consider a non-cooperative decoding where base stations work in isolation, but a user is decoded as soon as one of its nearby base stations reads a clean signal from it. We find the decoding probability and quantify the gains introduced by multiple base stations. Specifically, the peak throughput increases linearly with the number of base stations $m$ and is roughly $m/4$ larger than the throughput of a single-base station that uses standard slotted Aloha. Next, we propose a cooperative decoding, where the mutually close base stations inform each other whenever they decode a user inside their coverage overlap. At each base station, the messages received from the nearby stations help resolve collisions by the interference cancellation mechanism. Building from our exact formulas for the non-cooperative case, we provide a heuristic formula for the cooperative decoding probability that reflects well the actual performance. Finally, we demonstrate by simulation significant gains of cooperation with respect to the non-cooperative decoding.
[ { "created": "Mon, 27 Jan 2014 10:51:34 GMT", "version": "v1" } ]
2014-01-28
[ [ "Bajovic", "Dragana", "" ], [ "Jakovetic", "Dusan", "" ], [ "Vukobratovic", "Dejan", "" ], [ "Crnojevic", "Vladimir", "" ] ]
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1401.6800
Giulio Schober
R. Starke and G. A. H. Schober
Functional Approach to Electrodynamics of Media
consistent with published version in Phot. Nano. Fund. Appl. (2015)
Phot. Nano. Fund. Appl. 14, 1-34 (2015)
10.1016/j.photonics.2015.02.001
null
cond-mat.mtrl-sci math-ph math.MP physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this article, we put forward a new approach to electrodynamics of materials. Based on the identification of induced electromagnetic fields as the microscopic counterparts of polarization and magnetization, we systematically employ the mutual functional dependencies of induced, external and total field quantities. This allows for a unified, relativistic description of the electromagnetic response without assuming the material to be composed of electric or magnetic dipoles. Using this approach, we derive universal (material-independent) relations between electromagnetic response functions such as the dielectric tensor, the magnetic susceptibility and the microscopic conductivity tensor. Our formulae can be reduced to well-known identities in special cases, but more generally include the effects of inhomogeneity, anisotropy, magnetoelectric coupling and relativistic retardation. If combined with the Kubo formalism, they would also lend themselves to the ab initio calculation of all linear electromagnetic response functions.
[ { "created": "Mon, 27 Jan 2014 10:56:50 GMT", "version": "v1" }, { "created": "Sat, 9 Aug 2014 13:19:11 GMT", "version": "v2" }, { "created": "Wed, 3 Dec 2014 18:26:35 GMT", "version": "v3" }, { "created": "Thu, 5 Feb 2015 08:52:42 GMT", "version": "v4" }, { "created": "Fri, 17 Apr 2015 15:07:00 GMT", "version": "v5" }, { "created": "Sat, 27 Aug 2016 11:39:43 GMT", "version": "v6" }, { "created": "Sat, 16 Dec 2017 09:36:12 GMT", "version": "v7" } ]
2017-12-19
[ [ "Starke", "R.", "" ], [ "Schober", "G. A. H.", "" ] ]
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1401.6803
Cristina Cano
Cristina Cano and David Malone
On Efficiency and Validity of Previous Homeplug MAC Performance Analysis
null
null
10.1016/j.comnet.2015.03.005
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Medium Access Control protocol of Power Line Communication networks (defined in Homeplug and IEEE 1901 standards) has received relatively modest attention from the research community. As a consequence, there is only one analytic model that complies with the standardised MAC procedures and considers unsaturated conditions. We identify two important limitations of the existing analytic model: high computational expense and predicted results just prior to the predicted saturation point do not correspond to long-term network performance. In this work, we present a simplification of the previously defined analytic model of Homeplug MAC able to substantially reduce its complexity and demonstrate that the previous performance results just before predicted saturation correspond to a transitory phase. We determine that the causes of previous misprediction are common analytical assumptions and the potential occurrence of a transitory phase, that we show to be of extremely long duration under certain circumstances. We also provide techniques, both analytical and experimental, to correctly predict long-term behaviour and analyse the effect of specific Homeplug/IEEE 1901 features on the magnitude of misprediction errors.
[ { "created": "Mon, 27 Jan 2014 11:04:04 GMT", "version": "v1" }, { "created": "Mon, 13 Oct 2014 10:21:51 GMT", "version": "v2" } ]
2015-09-02
[ [ "Cano", "Cristina", "" ], [ "Malone", "David", "" ] ]
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1401.6810
Dragana Bajovic
Dusan Jakovetic, Dragana Bajovic, Dejan Vukobratovic, and Vladimir Crnojevic
Slotted Aloha for Networked Base Stations with Spatial and Temporal Diversity
extended version of a conference paper submitted on Jan 24, 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider framed slotted Aloha where $m$ base stations cooperate to decode messages from $n$ users. Users and base stations are placed uniformly at random over an area. At each frame, each user sends multiple replicas of its packet according to a prescribed distribution, and it is heard by all base stations within the communication radius $r$. Base stations employ a decoding algorithm that utilizes the successive interference cancellation mechanism, both in space--across neighboring base stations, and in time--across different slots, locally at each base station. We show that there exists a threshold on the normalized load $G=n/(\tau m)$, where $\tau$ is the number of slots per frame, below which decoding probability converges asymptotically (as $n,m,\tau\rightarrow \infty$, $r\rightarrow 0$) to the maximal possible value--the probability that a user is heard by at least one base station, and we find a lower bound on the threshold. Further, we give a heuristic evaluation of the decoding probability based on the and-or-tree analysis. Finally, we show that the peak throughput increases linearly in the number of base stations.
[ { "created": "Mon, 27 Jan 2014 11:33:03 GMT", "version": "v1" } ]
2014-01-28
[ [ "Jakovetic", "Dusan", "" ], [ "Bajovic", "Dragana", "" ], [ "Vukobratovic", "Dejan", "" ], [ "Crnojevic", "Vladimir", "" ] ]
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1401.6829
Olivier Arcizet
Arnaud Gloppe (NEEL), Pierre Verlot (NEEL), Eva Dupont-Ferrier (NEEL), Alessandro Siria (LPMCN), Philippe Poncharal (LPMCN), Guillaume Bachelier (NEEL), Pascal Vincent (LPMCN), Olivier Arcizet (NEEL)
Bidimensional nano-optomechanics and topological backaction in a non-conservative radiation force field
null
null
10.1038/nnano.2014.189
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Optomechanics, which explores the fundamental coupling between light and mechanical motion, has made important advances in both exploring and manipulating macroscopic mechanical oscillators down to the quantum level. However, dynamical effects related to the vectorial nature of the optomechanical interaction remain to be investigated. Here we study a nanowire with sub-wavelength dimensions strongly coupled to a tightly focused beam of light, enabling ultrasensitive readout of the nanoresonators dynamics. We experimentally determine the vectorial structure of the optomechanical interaction and demonstrate that bidimensional dynamical backaction governs the nanowire dynamics. Moreover, the non-conservative topology of the optomechanical interaction is responsible for a novel canonical signature of strong coupling between the nanoresonator mechanical modes, leading to a topological instability. These results have a universal character and illustrate the increased sensitivity of nanomechanical devices towards topologically varying interactions, opening fundamental perspectives in nanomechanics, optomechanics, ultrasensitive scanning probe force microscopy and nano-optics.
[ { "created": "Mon, 27 Jan 2014 12:54:28 GMT", "version": "v1" } ]
2015-06-18
[ [ "Gloppe", "Arnaud", "", "NEEL" ], [ "Verlot", "Pierre", "", "NEEL" ], [ "Dupont-Ferrier", "Eva", "", "NEEL" ], [ "Siria", "Alessandro", "", "LPMCN" ], [ "Poncharal", "Philippe", "", "LPMCN" ], [ "Bachelier", "Guillaume", "", "NEEL" ], [ "Vincent", "Pascal", "", "LPMCN" ], [ "Arcizet", "Olivier", "", "NEEL" ] ]
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1401.6835
Olivier Finkel
Olivier Finkel (ELM, IMJ), Micha{\l} Skrzypczak
On the Topological Complexity of omega-Languages of Non-Deterministic Petri Nets
null
Information Processing Letters 114, 5 (2014) 229-233
null
null
cs.LO cs.CC cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that there are $\Sigma_3^0$-complete languages of infinite words accepted by non-deterministic Petri nets with B\"uchi acceptance condition, or equivalently by B\"uchi blind counter automata. This shows that omega-languages accepted by non-deterministic Petri nets are topologically more complex than those accepted by deterministic Petri nets.
[ { "created": "Mon, 27 Jan 2014 12:58:10 GMT", "version": "v1" } ]
2014-01-28
[ [ "Finkel", "Olivier", "", "ELM, IMJ" ], [ "Skrzypczak", "Michał", "" ] ]
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1401.6840
Petr Novotn\'y
Tom\'a\v{s} Br\'azdil, Stefan Kiefer, Anton\'in Ku\v{c}era, Petr Novotn\'y, Joost-Pieter Katoen
Zero-Reachability in Probabilistic Multi-Counter Automata
20 pages
null
null
null
cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the qualitative and quantitative zero-reachability problem in probabilistic multi-counter systems. We identify the undecidable variants of the problems, and then we concentrate on the remaining two cases. In the first case, when we are interested in the probability of all runs that visit zero in some counter, we show that the qualitative zero-reachability is decidable in time which is polynomial in the size of a given pMC and doubly exponential in the number of counters. Further, we show that the probability of all zero-reaching runs can be effectively approximated up to an arbitrarily small given error epsilon > 0 in time which is polynomial in log(epsilon), exponential in the size of a given pMC, and doubly exponential in the number of counters. In the second case, we are interested in the probability of all runs that visit zero in some counter different from the last counter. Here we show that the qualitative zero-reachability is decidable and SquareRootSum-hard, and the probability of all zero-reaching runs can be effectively approximated up to an arbitrarily small given error epsilon > 0 (these result applies to pMC satisfying a suitable technical condition that can be verified in polynomial time). The proof techniques invented in the second case allow to construct counterexamples for some classical results about ergodicity in stochastic Petri nets.
[ { "created": "Mon, 27 Jan 2014 13:11:14 GMT", "version": "v1" } ]
2014-01-28
[ [ "Brázdil", "Tomáš", "" ], [ "Kiefer", "Stefan", "" ], [ "Kučera", "Antonín", "" ], [ "Novotný", "Petr", "" ], [ "Katoen", "Joost-Pieter", "" ] ]
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1401.6846
Petar Popovski
Petar Popovski
Delayed Channel State Information: Incremental Redundancy with Backtrack Retransmission
Accepted at IEEE ICC 2014
null
10.1109/ICC.2014.6883624
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In many practical wireless systems, the Signal-to-Interference-and-Noise Ratio (SINR) that is applicable to a certain transmission, referred to as Channel State Information (CSI), can only be learned after the transmission has taken place and is thereby outdated (delayed). For example, this occurs under intermittent interference. We devise the backward retransmission (BRQ) scheme, which uses the delayed CSIT to send the optimal amount of incremental redundancy (IR). BRQ uses fixed-length packets, fixed-rate R transmission codebook, and operates as Markov block coding, where the correlation between the adjacent packets depends on the amount of IR parity bits. When the delayed CSIT is full and R grows asymptotically, the average throughput of BRQ becomes equal to the value achieved with prior CSIT and a fixed-power transmitter; however, at the expense of increased delay. The second contribution is a method for employing BRQ when a limited number of feedback bits is available to report the delayed CSIT. The main novelty is the idea to assemble multiple feedback opportunities and report multiple SINRs through vector quantization. This challenges the conventional wisdom in ARQ protocols where feedback bits are used to only quantize the CSIT of the immediate previous transmission.
[ { "created": "Mon, 27 Jan 2014 13:41:46 GMT", "version": "v1" } ]
2016-11-18
[ [ "Popovski", "Petar", "" ] ]
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1401.6848
Scott Aaronson
Scott Aaronson and Russell Impagliazzo and Dana Moshkovitz
AM with Multiple Merlins
48 pages
null
null
null
cs.CC quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce and study a new model of interactive proofs: AM(k), or Arthur-Merlin with k non-communicating Merlins. Unlike with the better-known MIP, here the assumption is that each Merlin receives an independent random challenge from Arthur. One motivation for this model (which we explore in detail) comes from the close analogies between it and the quantum complexity class QMA(k), but the AM(k) model is also natural in its own right. We illustrate the power of multiple Merlins by giving an AM(2) protocol for 3SAT, in which the Merlins' challenges and responses consist of only n^{1/2+o(1)} bits each. Our protocol has the consequence that, assuming the Exponential Time Hypothesis (ETH), any algorithm for approximating a dense CSP with a polynomial-size alphabet must take n^{(log n)^{1-o(1)}} time. Algorithms nearly matching this lower bound are known, but their running times had never been previously explained. Brandao and Harrow have also recently used our 3SAT protocol to show quasipolynomial hardness for approximating the values of certain entangled games. In the other direction, we give a simple quasipolynomial-time approximation algorithm for free games, and use it to prove that, assuming the ETH, our 3SAT protocol is essentially optimal. More generally, we show that multiple Merlins never provide more than a polynomial advantage over one: that is, AM(k)=AM for all k=poly(n). The key to this result is a subsampling theorem for free games, which follows from powerful results by Alon et al. and Barak et al. on subsampling dense CSPs, and which says that the value of any free game can be closely approximated by the value of a logarithmic-sized random subgame.
[ { "created": "Mon, 27 Jan 2014 13:48:49 GMT", "version": "v1" } ]
2014-01-28
[ [ "Aaronson", "Scott", "" ], [ "Impagliazzo", "Russell", "" ], [ "Moshkovitz", "Dana", "" ] ]
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1401.6853
Christian Bauckhage
Christian Bauckhage
Computing the Kullback-Leibler Divergence between two Generalized Gamma Distributions
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null
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We derive a closed form solution for the Kullback-Leibler divergence between two generalized gamma distributions. These notes are meant as a reference and provide a guided tour towards a result of practical interest that is rarely explicated in the literature.
[ { "created": "Mon, 27 Jan 2014 14:03:35 GMT", "version": "v1" } ]
2014-01-28
[ [ "Bauckhage", "Christian", "" ] ]
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1401.6856
Ay\c{s}e G\"une\c{s} Tan{\i}r
AG Tanir, O Gulec, E Sahiner, MH Bolukdemir, K Koc, N Meric, SK Keles and O Kucuk
Direct determination of external radiation dose in human blood
10 pages, 8 figures This paper has been withdrawn by the author because arXiv:1401.6856 (external radiation dose) and arXiv:1401.5386 (internal radiation dose) are combined as one paper titled "Direct determination of radiation dose in human blood" (identifier: arXiv:1405.5386)
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physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this study it was shown that it is possible to determine radiation doses from external beam therapy both directly and retrospectively from a human blood sample. To the best of our knowledge no other studies exist on the direct measurement of doses received by a person from external beam therapy. Optically stimulated luminescence counts from a healthy blood sample exposed to an external radiation source were measured. Blood aliquots were given 0, 1, 2, 3, 4, 5, 10, 15, 20, 25, 50, 100 and 200Gy beta doses and their decay and dose-response curves were plotted. While the luminescence intensities were found to be relatively low for the doses smaller than 10Gy, they were measured considerably higher for doses greater than 10Gy. The dose received by the blood aliquots was determined by interpolating the luminescence counts of 10Gy to the dose-response curve. This study has important ramifications for healthcare, medicine and radiation protection
[ { "created": "Mon, 27 Jan 2014 14:07:57 GMT", "version": "v1" }, { "created": "Thu, 22 May 2014 07:24:28 GMT", "version": "v2" }, { "created": "Thu, 14 Jan 2016 11:21:40 GMT", "version": "v3" } ]
2016-01-15
[ [ "Tanir", "AG", "" ], [ "Gulec", "O", "" ], [ "Sahiner", "E", "" ], [ "Bolukdemir", "MH", "" ], [ "Koc", "K", "" ], [ "Meric", "N", "" ], [ "Keles", "SK", "" ], [ "Kucuk", "O", "" ] ]
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1401.6864
null
O M Jones, C A Michael, M Cecconello, I Wodniak, K G McClements, D L Keeling, C D Challis, M Turnyanskiy, A J Meakins, N J Conway, B J Crowley, R J Akers, MAST team
Measurements and modelling of fast-ion redistribution due to MHD instabilities in the Mega-Amp Spherical Tokamak
28 pages, 18 figures
null
null
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The results of a comprehensive investigation into the effects of various MHD modes on the NBI-generated fast-ion population in MAST plasmas are reported. Fast-ion redistribution due to low-frequency (20-50 kHz) chirping energetic particle modes known as fishbones, as well as the long-lived internal kink mode, is observed with the Fast-Ion Deuterium Alpha (FIDA) spectrometer and radially-scanning collimated neutron camera. In addition, strongly-driven chirping toroidicity-induced Alfven eigenmodes are observed to cause fast-ion redistribution, as are sawteeth and large edge-localised modes. In each case, the modes affect fast ions in a region of real space governed by the eigenmode structure and principal toroidal mode number. Modelling using the global transport analysis code TRANSP, with ad hoc anomalous diffusion introduced, reproduces the coarsest features of the affected fast-ion distribution in the presence of energetic-particle-driven modes, but the spectrally and spatially resolved FIDA measurements suggest that the distribution exhibits structure on a finer scale than is accounted for by this model.
[ { "created": "Mon, 27 Jan 2014 14:27:48 GMT", "version": "v1" } ]
2014-01-28
[ [ "Jones", "O M", "" ], [ "Michael", "C A", "" ], [ "Cecconello", "M", "" ], [ "Wodniak", "I", "" ], [ "McClements", "K G", "" ], [ "Keeling", "D L", "" ], [ "Challis", "C D", "" ], [ "Turnyanskiy", "M", "" ], [ "Meakins", "A J", "" ], [ "Conway", "N J", "" ], [ "Crowley", "B J", "" ], [ "Akers", "R J", "" ], [ "team", "MAST", "" ] ]
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1401.6865
Shun Ogawa
Shun Ogawa, Julien Barr\'e, Hidetoshi Morita, and Yoshiyuki Y. Yamaguchi
Dynamical pattern formations in two dimensional fluid and Landau pole bifurcation
9 pages, 7 figures
Phys. Rev. E 89, 063007 (2014)
10.1103/PhysRevE.89.063007
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A phenomenological theory is proposed to analyze the asymptotic dynamics of perturbed inviscid Kolmogorov shear flows in two dimensions. The phase diagram provided by the theory is in qualitative agreement with numerical observations, which include three phases depending on the aspect ratio of the domain and the size of the perturbation: a steady shear flow, a stationary dipole, and four traveling vortices. The theory is based on a precise study of the inviscid damping of the linearized equation and on an analysis of nonlinear effects. In particular, we show that the dominant Landau pole controlling the inviscid damping undergoes a bifurcation, which has important consequences on the asymptotic fate of the perturbation.
[ { "created": "Mon, 27 Jan 2014 14:30:17 GMT", "version": "v1" } ]
2014-06-18
[ [ "Ogawa", "Shun", "" ], [ "Barré", "Julien", "" ], [ "Morita", "Hidetoshi", "" ], [ "Yamaguchi", "Yoshiyuki Y.", "" ] ]
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1401.6875
Shaolin Qu
Shaolin Qu, Joyce Y. Chai
Context-based Word Acquisition for Situated Dialogue in a Virtual World
null
Journal Of Artificial Intelligence Research, Volume 37, pages 247-277, 2010
10.1613/jair.2912
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
To tackle the vocabulary problem in conversational systems, previous work has applied unsupervised learning approaches on co-occurring speech and eye gaze during interaction to automatically acquire new words. Although these approaches have shown promise, several issues related to human language behavior and human-machine conversation have not been addressed. First, psycholinguistic studies have shown certain temporal regularities between human eye movement and language production. While these regularities can potentially guide the acquisition process, they have not been incorporated in the previous unsupervised approaches. Second, conversational systems generally have an existing knowledge base about the domain and vocabulary. While the existing knowledge can potentially help bootstrap and constrain the acquired new words, it has not been incorporated in the previous models. Third, eye gaze could serve different functions in human-machine conversation. Some gaze streams may not be closely coupled with speech stream, and thus are potentially detrimental to word acquisition. Automated recognition of closely-coupled speech-gaze streams based on conversation context is important. To address these issues, we developed new approaches that incorporate user language behavior, domain knowledge, and conversation context in word acquisition. We evaluated these approaches in the context of situated dialogue in a virtual world. Our experimental results have shown that incorporating the above three types of contextual information significantly improves word acquisition performance.
[ { "created": "Thu, 16 Jan 2014 04:48:43 GMT", "version": "v1" } ]
2014-01-28
[ [ "Qu", "Shaolin", "" ], [ "Chai", "Joyce Y.", "" ] ]
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1401.6876
Preslav Ivanov Nakov
Preslav Ivanov Nakov, Hwee Tou Ng
Improving Statistical Machine Translation for a Resource-Poor Language Using Related Resource-Rich Languages
null
Journal Of Artificial Intelligence Research, Volume 44, pages 179-222, 2012
10.1613/jair.3540
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a novel language-independent approach for improving machine translation for resource-poor languages by exploiting their similarity to resource-rich ones. More precisely, we improve the translation from a resource-poor source language X_1 into a resource-rich language Y given a bi-text containing a limited number of parallel sentences for X_1-Y and a larger bi-text for X_2-Y for some resource-rich language X_2 that is closely related to X_1. This is achieved by taking advantage of the opportunities that vocabulary overlap and similarities between the languages X_1 and X_2 in spelling, word order, and syntax offer: (1) we improve the word alignments for the resource-poor language, (2) we further augment it with additional translation options, and (3) we take care of potential spelling differences through appropriate transliteration. The evaluation for Indonesian- >English using Malay and for Spanish -> English using Portuguese and pretending Spanish is resource-poor shows an absolute gain of up to 1.35 and 3.37 BLEU points, respectively, which is an improvement over the best rivaling approaches, while using much less additional data. Overall, our method cuts the amount of necessary "real training data by a factor of 2--5.
[ { "created": "Thu, 23 Jan 2014 02:42:12 GMT", "version": "v1" } ]
2014-01-28
[ [ "Nakov", "Preslav Ivanov", "" ], [ "Ng", "Hwee Tou", "" ] ]
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1401.6877
Riad Abdmeziem
Riad Abdmeziem and Djamel Tandjaoui
Internet of Things: Concept, Building blocks, Applications and Challenges
arXiv admin note: substantial text overlap with arXiv:1207.0203, arXiv:1105.1693 by other authors
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cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Internet of things (IoT) constitutes one of the most important technology that has the potential to affect deeply our way of life, after mobile phones and Internet. The basic idea is that every objet that is around us will be part of the network (Internet), interacting to reach a common goal. In another word, the Internet of Things concept aims to link the physical world to the digital one. Technology advances along with popular demand will foster the wide spread deployement of IoT's services, it would radically transform our corporations, communities, and personal spheres. In this survey, we aim to provide the reader with a broad overview of the Internet of things concept, its building blocks, its applications along with its challenges.
[ { "created": "Thu, 2 Jan 2014 15:37:15 GMT", "version": "v1" } ]
2014-01-28
[ [ "Abdmeziem", "Riad", "" ], [ "Tandjaoui", "Djamel", "" ] ]
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1401.6878
Albert Cabellos Aparicio
Albert Cabellos, Ignacio Ll\'atser, Eduard Alarc\'on, Allen Hsu, Tomas Palacios
Use of THz Photoconductive Sources to Characterize Tunable Graphene RF Plasmonic Antennas
null
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Graphene, owing to its ability to support plasmon polariton waves in the terahertz frequency range, enables the miniaturization of antennas to allow wireless communications among nanosystems. One of the main challenges in the demonstration of graphene antennas is finding suitable terahertz sources to feed the antenna. This paper estimates the performance of a graphene RF plasmonic micro-antenna fed with a photoconductive source. The terahertz source is modeled and, by means of a full-wave EM solver, the radiated power of the device is estimated with respect to material, laser illumination and antenna geometry parameters. The results show that the proposed device radiates terahertz pulses with an average power up to 1$\mu$W, proving the feasibility of feeding miniaturized graphene antennas with photoconductive materials.
[ { "created": "Mon, 27 Jan 2014 14:58:38 GMT", "version": "v1" }, { "created": "Tue, 18 Feb 2014 00:25:09 GMT", "version": "v2" } ]
2014-02-19
[ [ "Cabellos", "Albert", "" ], [ "Llátser", "Ignacio", "" ], [ "Alarcón", "Eduard", "" ], [ "Hsu", "Allen", "" ], [ "Palacios", "Tomas", "" ] ]
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1401.6881
null
T N Todd
Diagnostic systems in DEMO: engineering design issues
8 pages
AIP Conf. Proc. 1612 , 9 (2014)
10.1063/1.4894017
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The diagnostic systems of DEMO that are mounted on or near the torus, whether intended for the monitoring and control functions of the engineering aspects or the physics behaviour of the machine, will have to be designed to suit the hostile nuclear environment. This will be necessary not just for their survival and correct functioning but also to satisfy the pertinent regulatory bodies, especially where any of them relate to machine protection or the prevention or mitigation of accidents foreseen in the safety case. This paper aims to indicate the more important of the reactor design considerations that are likely to apply to diagnostics for DEMO, drawn from experience on JET, the provisions in hand for ITER and modelling results for the wall erosion and neutron damage effects in DEMO.
[ { "created": "Mon, 27 Jan 2014 15:07:07 GMT", "version": "v1" } ]
2015-10-29
[ [ "Todd", "T N", "" ] ]
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1401.6887
Waqas Nawaz
Kifayat Ullah Khan, Kamran Najeebullah, Waqas Nawaz, Young-Koo Lee
OLAP on Structurally Significant Data in Graphs
4 Pages, Accepted in 5th International Conference on Data Mining and Intelligent Information Technology Applications (ICMIA) 2013, Korea
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cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Summarized data analysis of graphs using OLAP (Online Analytical Processing) is very popular these days. However due to high dimensionality and large size, it is not easy to decide which data should be aggregated for OLAP analysis. Though iceberg cubing is useful, but it is unaware of the significance of dimensional values with respect to the structure of the graph. In this paper, we propose a Structural Significance, SS, measure to identify the structurally significant dimensional values in each dimension. This leads to structure aware pruning. We then propose an algorithm, iGraphCubing, to compute the graph cube to analyze the structurally significant data using the proposed measure. We evaluated the proposed ideas on real and synthetic data sets and observed very encouraging results.
[ { "created": "Mon, 27 Jan 2014 15:16:17 GMT", "version": "v1" } ]
2014-01-28
[ [ "Khan", "Kifayat Ullah", "" ], [ "Najeebullah", "Kamran", "" ], [ "Nawaz", "Waqas", "" ], [ "Lee", "Young-Koo", "" ] ]
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1401.6891
Gabriela Csurka
Gabriela Csurka and Julien Ah-Pine and St\'ephane Clinchant
Unsupervised Visual and Textual Information Fusion in Multimedia Retrieval - A Graph-based Point of View
An extended version of the paper: Visual and Textual Information Fusion in Multimedia Retrieval using Semantic Filtering and Graph based Methods, by J. Ah-Pine, G. Csurka and S. Clinchant, submitted to ACM Transactions on Information Systems
null
null
null
cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Multimedia collections are more than ever growing in size and diversity. Effective multimedia retrieval systems are thus critical to access these datasets from the end-user perspective and in a scalable way. We are interested in repositories of image/text multimedia objects and we study multimodal information fusion techniques in the context of content based multimedia information retrieval. We focus on graph based methods which have proven to provide state-of-the-art performances. We particularly examine two of such methods : cross-media similarities and random walk based scores. From a theoretical viewpoint, we propose a unifying graph based framework which encompasses the two aforementioned approaches. Our proposal allows us to highlight the core features one should consider when using a graph based technique for the combination of visual and textual information. We compare cross-media and random walk based results using three different real-world datasets. From a practical standpoint, our extended empirical analysis allow us to provide insights and guidelines about the use of graph based methods for multimodal information fusion in content based multimedia information retrieval.
[ { "created": "Mon, 27 Jan 2014 15:29:14 GMT", "version": "v1" } ]
2014-01-28
[ [ "Csurka", "Gabriela", "" ], [ "Ah-Pine", "Julien", "" ], [ "Clinchant", "Stéphane", "" ] ]
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1401.6892
Miguel Quartin
Elena Sellentin (ITP, U. Heidelberg), Miguel Quartin (Rio de Janeiro Federal U.), Luca Amendola (ITP, U. Heidelberg)
Breaking the spell of Gaussianity: forecasting with higher order Fisher matrices
v3: Corrected an error in Appendix A. Results and conclusions unchanged. v2: New figures and references added. Typos corrected. Matches published version. 10 pages, 6 figures
MNRAS (2014) 441 (2): 1831-1840
10.1093/mnras/stu689
null
astro-ph.CO astro-ph.IM physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the new method DALI (Derivative Approximation for LIkelihoods) for reconstructing and forecasting posteriors. DALI extends the Fisher Matrix formalism but allows for a much wider range of posterior shapes. While the Fisher Matrix formalism is limited to yield ellipsoidal confidence contours, our method can reproduce the often observed flexed, deformed or curved shapes of known posteriors. This gain in shape fidelity is obtained by expanding the posterior to higher order in derivatives with respect to parameters, such that non-Gaussianity in the parameter space is taken into account. The resulting expansion is positive definite and normalizable at every order. Here, we present the new technique, highlight its advantages and limitations, and show a representative application to a posterior of dark energy parameters from supernovae measurements.
[ { "created": "Mon, 27 Jan 2014 15:30:08 GMT", "version": "v1" }, { "created": "Wed, 14 May 2014 19:36:21 GMT", "version": "v2" }, { "created": "Thu, 6 Feb 2020 20:00:02 GMT", "version": "v3" } ]
2020-02-10
[ [ "Sellentin", "Elena", "", "ITP, U. Heidelberg" ], [ "Quartin", "Miguel", "", "Rio de Janeiro\n Federal U." ], [ "Amendola", "Luca", "", "ITP, U. Heidelberg" ] ]
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1401.6895
Ahmad Adlie Shamsuri
AA Shamsuri, R Daik, ES Zainudin and PM Tahir
Compatibilization of HDPE/agar biocomposites with eutectic-based ionic liquid containing surfactant
14 pages, 9 figures, 4 tables, Journal of Reinforced Plastics and Composites
Journal of Reinforced Plastics and Composites. 33(5): 440-453
10.1177/0731684413516688
null
physics.chem-ph
http://creativecommons.org/licenses/by/3.0/
In this research, eutectic-based ionic liquid specifically choline chloride/glycerol was prepared at a 1:2 mole ratio. The choline chloride/glycerol was added with the different content of surfactant (hexadecyltrimethylammonium bromide). The choline chloride/glycerol-hexadecyltrimethylammonium bromide was introduced into high-density polyethylene/agar biocomposites through melt mixing. The mechanical testing results indicated that the impact strength and tensile extension of the biocomposites increased with the introduction of the choline chloride/glycerol-hexadecyltrimethylammonium bromide. The scanning electron microscope, differential scanning calorimetry and thermal gravimetric analysis results exhibited that significant decrease in the number of agar fillers pull-out, melting point and thermal decomposition temperatures of the biocomposites are also due to the choline chloride/glycerol-hexadecyltrimethylammonium bromide. The Fourier transform infrared spectra and X-ray diffractometer patterns of the biocomposites introduced with the choline chloride/glycerol-hexadecyltrimethylammonium bromide demonstrate the presence of physical interactions, which contributes to the increase of compatibility between both high-density polyethylene and agar. In conclusion, high-density polyethylene/agar biocomposites could be compatibilized with eutectic-based ionic liquid containing surfactant, choline chloride/glycerol-hexadecyltrimethylammonium bromide.
[ { "created": "Mon, 27 Jan 2014 15:39:42 GMT", "version": "v1" }, { "created": "Wed, 12 Mar 2014 16:24:42 GMT", "version": "v2" } ]
2014-03-13
[ [ "Shamsuri", "AA", "" ], [ "Daik", "R", "" ], [ "Zainudin", "ES", "" ], [ "Tahir", "PM", "" ] ]
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1401.6897
Sebastian Trippel
S. Trippel, T. Mullins, N. L. M. M\"uller, J. S. Kienitz, J. J. Omiste, H. Stapelfeldt, R. Gonz\'alez-F\'erez, and J. K\"upper
Strongly driven quantum pendulum of the OCS molecule
6 pages, 4 figures
Phys. Rev. A 89, 051401 (2014)
10.1103/PhysRevA.89.051401
null
quant-ph physics.chem-ph physics.comp-ph
http://creativecommons.org/licenses/by/3.0/
We demonstrate and analyze a strongly driven quantum pendulum in the angular motion of stateselected and laser aligned OCS molecules. Raman-couplings during the rising edge of a 50-picosecond laser pulse create a wave packet of pendular states, which propagates in the confining potential formed by the polarizability interaction between the molecule and the laser field. This wave-packet dynamics manifests itself as pronounced oscillations in the degree of alignment with a laser-intensity dependent period.
[ { "created": "Mon, 27 Jan 2014 15:41:52 GMT", "version": "v1" } ]
2014-05-14
[ [ "Trippel", "S.", "" ], [ "Mullins", "T.", "" ], [ "Müller", "N. L. M.", "" ], [ "Kienitz", "J. S.", "" ], [ "Omiste", "J. J.", "" ], [ "Stapelfeldt", "H.", "" ], [ "González-Férez", "R.", "" ], [ "Küpper", "J.", "" ] ]
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