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1402.5708
Lavdim Kurtaj
Lavdim Kurtaj, Ilir Limani, Vjosa Shatri and Avni Skeja
The Cerebellum: New Computational Model that Reveals its Primary Function to Calculate Multibody Dynamics Conform to Lagrange-Euler Formulation
18 pages, 4 figures
IJCSI International Journal of Computer Science Issues, Vol. 10, Issue 5, No 2, September 2013
null
null
cs.NE cs.CE cs.RO q-bio.NC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cerebellum is part of the brain that occupies only 10% of the brain volume, but it contains about 80% of total number of brain neurons. New cerebellar function model is developed that sets cerebellar circuits in context of multibody dynamics model computations, as important step in controlling balance and movement coordination, functions performed by two oldest parts of the cerebellum. Model gives new functional interpretation for granule cells-Golgi cell circuit, including distinct function for upper and lower Golgi cell dendritc trees, and resolves issue of sharing Granule cells between Purkinje cells. Sets new function for basket cells, and for stellate cells according to position in molecular layer. New model enables easily and direct integration of sensory information from vestibular system and cutaneous mechanoreceptors, for balance, movement and interaction with environments. Model gives explanation of Purkinje cells convergence on deep-cerebellar nuclei.
[ { "created": "Mon, 24 Feb 2014 02:40:05 GMT", "version": "v1" } ]
2014-02-25
[ [ "Kurtaj", "Lavdim", "" ], [ "Limani", "Ilir", "" ], [ "Shatri", "Vjosa", "" ], [ "Skeja", "Avni", "" ] ]
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1402.5715
Tejas Kulkarni
Ardavan Saeedi, Tejas D Kulkarni, Vikash Mansinghka, Samuel Gershman
Variational Particle Approximations
First two authors contributed equally to this work
null
null
null
stat.ML cs.LG
http://creativecommons.org/licenses/by/4.0/
Approximate inference in high-dimensional, discrete probabilistic models is a central problem in computational statistics and machine learning. This paper describes discrete particle variational inference (DPVI), a new approach that combines key strengths of Monte Carlo, variational and search-based techniques. DPVI is based on a novel family of particle-based variational approximations that can be fit using simple, fast, deterministic search techniques. Like Monte Carlo, DPVI can handle multiple modes, and yields exact results in a well-defined limit. Like unstructured mean-field, DPVI is based on optimizing a lower bound on the partition function; when this quantity is not of intrinsic interest, it facilitates convergence assessment and debugging. Like both Monte Carlo and combinatorial search, DPVI can take advantage of factorization, sequential structure, and custom search operators. This paper defines DPVI particle-based approximation family and partition function lower bounds, along with the sequential DPVI and local DPVI algorithm templates for optimizing them. DPVI is illustrated and evaluated via experiments on lattice Markov Random Fields, nonparametric Bayesian mixtures and block-models, and parametric as well as non-parametric hidden Markov models. Results include applications to real-world spike-sorting and relational modeling problems, and show that DPVI can offer appealing time/accuracy trade-offs as compared to multiple alternatives.
[ { "created": "Mon, 24 Feb 2014 03:58:16 GMT", "version": "v1" }, { "created": "Sat, 1 Mar 2014 00:07:30 GMT", "version": "v2" }, { "created": "Sun, 6 Dec 2015 04:40:24 GMT", "version": "v3" } ]
2015-12-08
[ [ "Saeedi", "Ardavan", "" ], [ "Kulkarni", "Tejas D", "" ], [ "Mansinghka", "Vikash", "" ], [ "Gershman", "Samuel", "" ] ]
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1402.5726
Chin Keong Ho
Chin Keong Ho, Di Yuan, Lei Lei, Sumei Sun
On Power and Load Coupling in Cellular Networks for Energy Optimization
Accepted for publication in IEEE Transactions on Wireless Communications
null
10.1109/TWC.2014.2353043
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of minimization of sum transmission energy in cellular networks where coupling occurs between cells due to mutual interference. The coupling relation is characterized by the signal-to-interference-and-noise-ratio (SINR) coupling model. Both cell load and transmission power, where cell load measures the average level of resource usage in the cell, interact via the coupling model. The coupling is implicitly characterized with load and power as the variables of interest using two equivalent equations, namely, non-linear load coupling equation (NLCE) and non-linear power coupling equation (NPCE), respectively. By analyzing the NLCE and NPCE, we prove that operating at full load is optimal in minimizing sum energy, and provide an iterative power adjustment algorithm to obtain the corresponding optimal power solution with guaranteed convergence, where in each iteration a standard bisection search is employed. To obtain the algorithmic result, we use the properties of the so-called standard interference function; the proof is non-standard because the NPCE cannot even be expressed as a closed-form expression with power as the implicit variable of interest. We present numerical results illustrating the theoretical findings for a real-life and large-scale cellular network, showing the advantage of our solution compared to the conventional solution of deploying uniform power for base stations.
[ { "created": "Mon, 24 Feb 2014 05:32:47 GMT", "version": "v1" }, { "created": "Tue, 24 Jun 2014 08:35:05 GMT", "version": "v2" }, { "created": "Tue, 26 Aug 2014 02:58:28 GMT", "version": "v3" } ]
2016-11-18
[ [ "Ho", "Chin Keong", "" ], [ "Yuan", "Di", "" ], [ "Lei", "Lei", "" ], [ "Sun", "Sumei", "" ] ]
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1402.5728
Mathukumalli Vidyasagar
Mathukumalli Vidyasagar
Machine Learning Methods in the Computational Biology of Cancer
35 pages, three figures
null
10.1098/rspa.2014.0081
null
q-bio.QM cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The objectives of this "perspective" paper are to review some recent advances in sparse feature selection for regression and classification, as well as compressed sensing, and to discuss how these might be used to develop tools to advance personalized cancer therapy. As an illustration of the possibilities, a new algorithm for sparse regression is presented, and is applied to predict the time to tumor recurrence in ovarian cancer. A new algorithm for sparse feature selection in classification problems is presented, and its validation in endometrial cancer is briefly discussed. Some open problems are also presented.
[ { "created": "Mon, 24 Feb 2014 06:07:56 GMT", "version": "v1" } ]
2015-06-18
[ [ "Vidyasagar", "Mathukumalli", "" ] ]
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1402.5729
Mamiko Nishiuchi
Mamiko Nishiuchi, Hironao Sakaki, Katsuhisa Nishio, Riccard Orlandi, Hiroyuki Sako, Tatiana. A. Pikuz, Anatory Ya. Faenov, Timur Zh. Esirkepov, Alexander S. Pirozhkov, Kenya Matsukawa, Akito Sagisaka, Koichi Ogura, Masato Kanasaki, Hiromitsu Kiriyama, Yuji Fukuda, Hiroyuki Koura, Masaki Kando, Tomoya Yamauchi, Yukinobu Watanabe, Sergei V. Bulanov, Kiminori Kondo, Kenichi Imai and Shoji Nagamiya
Towards a novel laser-driven method of exotic nuclei extraction-acceleration for fundamental physics and technology
including supplementary information
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physics.acc-ph physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The measurement of properties of exotic nuclei, essential for fundamental nuclear physics, now confronts a formidable challenge for contemporary radiofrequency accelerator technology. A promising option can be found in the combination of state-of-the-art high-intensity short pulse laser system and nuclear measurement techniques. We propose a novel Laser-driven Exotic Nuclei extraction-acceleration method (LENex): a femtosecond petawatt laser, irradiating a target bombarded by an external ion beam, extracts from the target and accelerates to few GeV highly-charged nuclear reaction products. Here a proof-of-principle experiment of LENex is presented: a few hundred-terawatt laser focused onto an aluminum foil, with a small amount of iron simulating nuclear reaction products, extracts almost fully stripped iron nuclei and accelerate them up to 0.9 GeV. Our experiments and numerical simulations show that short-lived, heavy exotic nuclei, with a much larger charge-to-mass ratio than in conventional technology, can be obtained in the form of an energetic, low-emittance, high-current beam.
[ { "created": "Mon, 24 Feb 2014 06:10:50 GMT", "version": "v1" } ]
2014-02-25
[ [ "Nishiuchi", "Mamiko", "" ], [ "Sakaki", "Hironao", "" ], [ "Nishio", "Katsuhisa", "" ], [ "Orlandi", "Riccard", "" ], [ "Sako", "Hiroyuki", "" ], [ "Pikuz", "Tatiana. A.", "" ], [ "Faenov", "Anatory Ya.", "" ], [ "Esirkepov", "Timur Zh.", "" ], [ "Pirozhkov", "Alexander S.", "" ], [ "Matsukawa", "Kenya", "" ], [ "Sagisaka", "Akito", "" ], [ "Ogura", "Koichi", "" ], [ "Kanasaki", "Masato", "" ], [ "Kiriyama", "Hiromitsu", "" ], [ "Fukuda", "Yuji", "" ], [ "Koura", "Hiroyuki", "" ], [ "Kando", "Masaki", "" ], [ "Yamauchi", "Tomoya", "" ], [ "Watanabe", "Yukinobu", "" ], [ "Bulanov", "Sergei V.", "" ], [ "Kondo", "Kiminori", "" ], [ "Imai", "Kenichi", "" ], [ "Nagamiya", "Shoji", "" ] ]
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1402.5730
Derrick Wing Kwan Ng
Shiyang Leng, Derrick Wing Kwan Ng, and Robert Schober
Power Efficient and Secure Multiuser Communication Systems with Wireless Information and Power Transfer
Accepted for presentation at the IEEE International Conference on Communications (ICC), Sydney, Australia, 2014
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null
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study resource allocation algorithm design for power efficient secure communication with simultaneous wireless information and power transfer (WIPT) in multiuser communication systems. In particular, we focus on power splitting receivers which are able to harvest energy and decode information from the received signals. The considered problem is modeled as an optimization problem which takes into account a minimum required signal-to-interference-plus-noise ratio (SINR) at multiple desired receivers, a maximum tolerable data rate at multiple multi-antenna potential eavesdroppers, and a minimum required power delivered to the receivers. The proposed problem formulation facilitates the dual use of artificial noise in providing efficient energy transfer and guaranteeing secure communication. We aim at minimizing the total transmit power by jointly optimizing transmit beamforming vectors, power splitting ratios at the desired receivers, and the covariance of the artificial noise. The resulting non-convex optimization problem is transformed into a semidefinite programming (SDP) and solved by SDP relaxation. We show that the adopted SDP relaxation is tight and achieves the global optimum of the original problem. Simulation results illustrate the significant power saving obtained by the proposed optimal algorithm compared to suboptimal baseline schemes.
[ { "created": "Mon, 24 Feb 2014 06:11:41 GMT", "version": "v1" } ]
2014-02-25
[ [ "Leng", "Shiyang", "" ], [ "Ng", "Derrick Wing Kwan", "" ], [ "Schober", "Robert", "" ] ]
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1402.5731
Cem Aksoylar
Cem Aksoylar and Venkatesh Saligrama
Information-Theoretic Bounds for Adaptive Sparse Recovery
Accepted to IEEE ISIT 2014. Better presentation and fixed errors compared to the previous version
null
null
null
cs.IT cs.LG math.IT math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We derive an information-theoretic lower bound for sample complexity in sparse recovery problems where inputs can be chosen sequentially and adaptively. This lower bound is in terms of a simple mutual information expression and unifies many different linear and nonlinear observation models. Using this formula we derive bounds for adaptive compressive sensing (CS), group testing and 1-bit CS problems. We show that adaptivity cannot decrease sample complexity in group testing, 1-bit CS and CS with linear sparsity. In contrast, we show there might be mild performance gains for CS in the sublinear regime. Our unified analysis also allows characterization of gains due to adaptivity from a wider perspective on sparse problems.
[ { "created": "Mon, 24 Feb 2014 06:20:34 GMT", "version": "v1" }, { "created": "Tue, 29 Apr 2014 19:18:08 GMT", "version": "v2" } ]
2014-04-30
[ [ "Aksoylar", "Cem", "" ], [ "Saligrama", "Venkatesh", "" ] ]
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1402.5732
Christina Birdie
N.Kameswara Rao, Christina Birdie, A.Vagiswari
Bhavnagar Telescope: the most widely travelled telescope in the country
3 pages, 2 figures, Historical notes
current science, 2014, vol.106, no.4, 25th Feb
null
null
physics.hist-ph astro-ph.IM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the last decade of the 19th century Maharaja Takhtasingji Observatory was built at Poona (1888-1912) under the supervision of K.D.Naegamavala, with the grant from Maharaja of Bhavnagar (from where the name Bhavnagar Telescope must have originated. The story of this telescope from its inception to the current status is traced. IIA Archives has been extensively used to resource information for this note.
[ { "created": "Mon, 24 Feb 2014 06:35:51 GMT", "version": "v1" } ]
2014-02-25
[ [ "Rao", "N. Kameswara", "" ], [ "Birdie", "Christina", "" ], [ "Vagiswari", "A.", "" ] ]
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1402.5734
Cunsheng Ding
Cunsheng Ding, Longjiang Qu, Qiang Wang, Jin Yuan and Pingzhi Yuan
Permutation trinomials over finite fields with even characteristic
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Permutation polynomials have been a subject of study for a long time and have applications in many areas of science and engineering. However, only a small number of specific classes of permutation polynomials are described in the literature so far. In this paper we present a number of permutation trinomials over finite fields, which are of different forms.
[ { "created": "Mon, 24 Feb 2014 06:58:44 GMT", "version": "v1" } ]
2014-02-25
[ [ "Ding", "Cunsheng", "" ], [ "Qu", "Longjiang", "" ], [ "Wang", "Qiang", "" ], [ "Yuan", "Jin", "" ], [ "Yuan", "Pingzhi", "" ] ]
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1402.5742
Ismail Toroslu
Ugur Turan, Ismail Hakki Toroslu
Secure Logical Schema and Decomposition Algorithm for Proactive Context Dependent Attribute Based Access Control
12 pages
null
null
null
cs.DB cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Traditional database access control mechanisms use role based methods, with generally row based and attribute based constraints for granularity, and privacy is achieved mainly by using views. However if only a set of views according to policy are made accessible to users, then this set should be checked against the policy for the whole probable query history. The aim of this work is to define a proactive decomposition algorithm according to the attribute based policy rules and build a secure logical schema in which relations are decomposed into several ones in order to inhibit joins or inferences that may violate predefined privacy constraints. The attributes whose association should not be inferred, are defined as having security dependency among them and they form a new kind of context dependent attribute based policy rule named as security dependent set. The decomposition algorithm works on a logical schema with given security dependent sets and aims to prohibit the inference of the association among the elements of these sets. It is also proven that the decomposition technique generates a secure logical schema that is in compliance with the given security dependent set constraints.
[ { "created": "Mon, 24 Feb 2014 07:55:17 GMT", "version": "v1" }, { "created": "Thu, 17 Jul 2014 07:12:46 GMT", "version": "v2" } ]
2014-07-18
[ [ "Turan", "Ugur", "" ], [ "Toroslu", "Ismail Hakki", "" ] ]
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1402.5743
Shen Huang
Shen Huang, Hongfei Cui, Yiming Ding
Evaluation of node importance in complex networks
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cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The assessment of node importance has been a fundamental issue in the research of complex networks. In this paper, we propose to use the Shannon-Parry measure (SPM) to evaluate the importance of a node quantitatively, because SPM is the stationary distribution of the most unprejudiced random walk on the network. We demonstrate the accuracy and robustness of SPM compared with several popular methods in the Zachary karate club network and three toy networks. We apply SPM to analyze the city importance of China Railways High-speed (CRH) network, and obtain reasonable results. Since SPM can be used effectively in weighted and directed network, we believe it is a relevant method to identify key nodes in networks.
[ { "created": "Mon, 24 Feb 2014 08:08:22 GMT", "version": "v1" } ]
2014-02-25
[ [ "Huang", "Shen", "" ], [ "Cui", "Hongfei", "" ], [ "Ding", "Yiming", "" ] ]
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1402.5745
Mohamed El-Zawawy Dr.
Mohamed A. El-Zawawy
Distributed Data and Programs Slicing
9 pages, 8 figures
Life Science Journal, 2013, 10(4), pp. 1361--1369
null
null
cs.PL cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a new technique for data slicing of distributed programs running on a hierarchy of machines. Data slicing can be realized as a program transformation that partitions heaps of machines in a hierarchy into independent regions. Inside each region of each machine, pointers preserve the original pointer structures in the original heap hierarchy. Each heap component of the base type (e.g., the integer type) goes only to a region of one of the heaps. The proposed technique has the shape of a system of inference rules. In addition, this paper presents a simply structure type system to decide type soundness of distributed programs. Using this type system, a mathematical proof that the proposed slicing technique preserves typing properties is outlined in this paper as well.
[ { "created": "Mon, 24 Feb 2014 08:23:34 GMT", "version": "v1" } ]
2014-02-25
[ [ "El-Zawawy", "Mohamed A.", "" ] ]
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1402.5748
Aarti
Aarti, Sanjiv Kumar Tomar
A Parametric Chain based Routing Approach for Underwater Sensor Network
4 pages,1 figure
International Journal of Computer Trends and Technology (IJCTT) , 4(1): 1492-1495, May 2013, Published by Seventh Sense Research Group
null
null
cs.NI cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A sensor network is one of the critical networks that is based on hardware components as well the energy parameters. Because of this, such network requires the optimization in all kind communication to improve the network life. In case of underwater sensor network, the criticality of network is also increased because of the random floating movement of the nodes. In this work, a composition of the multicast or broadcast communication is presented by the generation of aggregative path. The presented work is about to define a new chain based aggregative routing approach to provide the effective communication over the network. In this work, an effective aggregative path is suggested under the different parameters of energy, distance and congestion analysis. Based on these parameters a trustful aggregative route will be generated so that the network life will be improved.
[ { "created": "Mon, 24 Feb 2014 08:44:46 GMT", "version": "v1" } ]
2014-02-25
[ [ "Aarti", "", "" ], [ "Tomar", "Sanjiv Kumar", "" ] ]
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1402.5749
Richard McClatchey
R. McClatchey, A. Branson, A. Anjum, P. Bloodsworth, I. Habib, K. Munir, J. Shamdasani, K. Soomro and the neuGRID Consortium
Providing Traceability for Neuroimaging Analyses
17 pages, 9 figures, 2 tables
International Journal of Medical Informatics, 82 (2013) pp 882-894 Elsevier publishers
10.1016/j.ijmedinf.2013.05.005
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With the increasingly digital nature of biomedical data and as the complexity of analyses in medical research increases, the need for accurate information capture, traceability and accessibility has become crucial to medical researchers in the pursuance of their research goals. Grid- or Cloud-based technologies, often based on so-called Service Oriented Architectures (SOA), are increasingly being seen as viable solutions for managing distributed data and algorithms in the bio-medical domain. For neuroscientific analyses, especially those centred on complex image analysis, traceability of processes and datasets is essential but up to now this has not been captured in a manner that facilitates collaborative study. Over the past decade, we have been working with mammographers, paediatricians and neuroscientists in three generations of projects to provide the data management and provenance services now required for 21st century medical research. This paper outlines the finding of a requirements study and a resulting system architecture for the production of services to support neuroscientific studies of biomarkers for Alzheimers Disease. The paper proposes a software infrastructure and services that provide the foundation for such support. It introduces the use of the CRISTAL software to provide provenance management as one of a number of services delivered on a SOA, deployed to manage neuroimaging projects that have been studying biomarkers for Alzheimers disease.
[ { "created": "Mon, 24 Feb 2014 08:44:49 GMT", "version": "v1" } ]
2014-02-25
[ [ "McClatchey", "R.", "" ], [ "Branson", "A.", "" ], [ "Anjum", "A.", "" ], [ "Bloodsworth", "P.", "" ], [ "Habib", "I.", "" ], [ "Munir", "K.", "" ], [ "Shamdasani", "J.", "" ], [ "Soomro", "K.", "" ], [ "Consortium", "the neuGRID", "" ] ]
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1402.5750
YuLi Sun
Yuli Sun and Jinxu Tao
A new inexact iterative hard thresholding algorithm for compressed sensing
9 pages, 2 figures, 1 table
null
null
null
cs.IT math.IT
http://creativecommons.org/licenses/by-nc-sa/3.0/
Compressed sensing (CS) demonstrates that a sparse, or compressible signal can be acquired using a low rate acquisition process below the Nyquist rate, which projects the signal onto a small set of vectors incoherent with the sparsity basis. In this paper, we propose a new framework for compressed sensing recovery problem using iterative approximation method via L0 minimization. Instead of directly solving the unconstrained L0 norm optimization problem, we use the linearization and proximal points techniques to approximate the penalty function at each iteration. The proposed algorithm is very simple, efficient, and proved to be convergent. Numerical simulation demonstrates our conclusions and indicates that the algorithm can improve the reconstruction quality.
[ { "created": "Mon, 24 Feb 2014 08:56:58 GMT", "version": "v1" } ]
2014-02-25
[ [ "Sun", "Yuli", "" ], [ "Tao", "Jinxu", "" ] ]
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1402.5753
Richard McClatchey
Andrew Branson, Richard McClatchey, Jean-Marie Le Goff and Jetendr Shamdasani
CRISTAL : A Practical Study in Designing Systems to Cope with Change
20mpages, 5 figures, 1 table
Information Systems 42 (2014), pp 139-152 Elsevier Publishers
10.1016/j.is.2013.12.009
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Software engineers frequently face the challenge of developing systems whose requirements are likely to change in order to adapt to organizational reconfigurations or other external pressures. Evolving requirements present difficulties, especially in environments in which business agility demands shorter development times and responsive prototyping. This paper uses a study from CERN in Geneva to address these research questions by employing a description-driven approach that is responsive to changes in user requirements and that facilitates dynamic system reconfiguration. The study describes how handling descriptions of objects in practice alongside their instances (making the objects self-describing) can mediate the effects of evolving user requirements on system development. This paper reports on and draws lessons from the practical use of a description-driven system over time. It also identifies lessons that can be learned from adopting such a self-describing description-driven approach in future software development.
[ { "created": "Mon, 24 Feb 2014 08:59:34 GMT", "version": "v1" } ]
2014-02-25
[ [ "Branson", "Andrew", "" ], [ "McClatchey", "Richard", "" ], [ "Goff", "Jean-Marie Le", "" ], [ "Shamdasani", "Jetendr", "" ] ]
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1402.5757
Richard McClatchey
Kamran Munir, Saad Liaquat Kiani, Khawar Hasham, Richard McClatchey, Andrew Branson, Jetendr Shamdasani and the N4U Consortium
An Integrated e-science Analysis Base for Computation Neuroscience Experiments and Analysis
8 pages & 4 figures
Procedia - Social and Behavioral Sciences. Vol 73 pp 85-92 (2013) Elsevier Publishers
10.1016/j.sbspro.2013.02.026.
null
cs.SE cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent developments in data management and imaging technologies have significantly affected diagnostic and extrapolative research in the understanding of neurodegenerative diseases. However, the impact of these new technologies is largely dependent on the speed and reliability with which the medical data can be visualised, analysed and interpreted. The EUs neuGRID for Users (N4U) is a follow-on project to neuGRID, which aims to provide an integrated environment to carry out computational neuroscience experiments. This paper reports on the design and development of the N4U Analysis Base and related Information Services, which addresses existing research and practical challenges by offering an integrated medical data analysis environment with the necessary building blocks for neuroscientists to optimally exploit neuroscience workflows, large image datasets and algorithms in order to conduct analyses. The N4U Analysis Base enables such analyses by indexing and interlinking the neuroimaging and clinical study datasets stored on the N4U Grid infrastructure, algorithms and scientific workflow definitions along with their associated provenance information.
[ { "created": "Mon, 24 Feb 2014 09:14:44 GMT", "version": "v1" } ]
2014-02-25
[ [ "Munir", "Kamran", "" ], [ "Kiani", "Saad Liaquat", "" ], [ "Hasham", "Khawar", "" ], [ "McClatchey", "Richard", "" ], [ "Branson", "Andrew", "" ], [ "Shamdasani", "Jetendr", "" ], [ "Consortium", "the N4U", "" ] ]
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1402.5758
Shipra Agrawal
Shipra Agrawal and Nikhil R. Devanur
Bandits with concave rewards and convex knapsacks
null
null
null
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we consider a very general model for exploration-exploitation tradeoff which allows arbitrary concave rewards and convex constraints on the decisions across time, in addition to the customary limitation on the time horizon. This model subsumes the classic multi-armed bandit (MAB) model, and the Bandits with Knapsacks (BwK) model of Badanidiyuru et al.[2013]. We also consider an extension of this model to allow linear contexts, similar to the linear contextual extension of the MAB model. We demonstrate that a natural and simple extension of the UCB family of algorithms for MAB provides a polynomial time algorithm that has near-optimal regret guarantees for this substantially more general model, and matches the bounds provided by Badanidiyuru et al.[2013] for the special case of BwK, which is quite surprising. We also provide computationally more efficient algorithms by establishing interesting connections between this problem and other well studied problems/algorithms such as the Blackwell approachability problem, online convex optimization, and the Frank-Wolfe technique for convex optimization. We give examples of several concrete applications, where this more general model of bandits allows for richer and/or more efficient formulations of the problem.
[ { "created": "Mon, 24 Feb 2014 09:27:18 GMT", "version": "v1" } ]
2014-02-25
[ [ "Agrawal", "Shipra", "" ], [ "Devanur", "Nikhil R.", "" ] ]
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1402.5759
Anne-Kathrin Schmuck
Anne-Kathrin Schmuck and J\"org Raisch
Asynchronous $l$-Complete Approximations
null
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper extends the $l$-complete approximation method developed for time invariant systems to a larger system class, ensuring that the resulting approximation can be realized by a finite state machine. To derive the new abstraction method, called asynchronous $l$-complete approximation, an asynchronous version of the well-known concepts of state property, memory span and $l$-completeness is introduced, extending the behavioral systems theory in a consistent way.
[ { "created": "Mon, 24 Feb 2014 09:38:51 GMT", "version": "v1" } ]
2014-02-25
[ [ "Schmuck", "Anne-Kathrin", "" ], [ "Raisch", "Jörg", "" ] ]
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1402.5760
Sylwester Przybyl Dr
Sylwester Przybyl and Piotr Pieranski
High resolution portrait of the ideal trefoil knot
14 figures
null
10.1088/1751-8113/47/28/285201
null
physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The shape of the most tight trefoil knot with N=200640 vertices found with an appropriately modified finite element method is analyzed. The high number of vertices makes plots of its curvature and torsion very precise what allows the authors to formulate new, firmly justified conjectures concerning the shape of the ideal trefoil knot.
[ { "created": "Mon, 24 Feb 2014 09:40:52 GMT", "version": "v1" } ]
2015-06-18
[ [ "Przybyl", "Sylwester", "" ], [ "Pieranski", "Piotr", "" ] ]
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1402.5761
Zijia Li
Zijia Li and Josef Schicho
A Technique for Deriving Equational Conditions on the Denavit-Hartenberg Parameters of 6R Linkages that are Necessary for Movability
null
Mechanism and Machine Theory 94 (2015)
10.1016/j.mechmachtheory.2015.07.010
null
cs.RO cs.SC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A closed 6R linkage is generically rigid. Special cases may be mobile. Many families of mobile 6R linkages have been characterised in terms of the invariant Denavit-Hartenberg parameters of the linkage. In other words, many sufficient conditions for mobility are known. In this paper we give, for the first time, equational conditions on the invariant Denavit-Hartenberg parameters that are necessary for mobility. The method is based on the theory of bonds. We illustrate the method by deriving the equational conditions for various well-known linkages (Bricard's line symmetric linkage, Hooke's linkage, Dietmaier's linkage, and recent a generalization of Bricard's orthogonal linkage), starting from their bond diagrams; and by deriving the equations for another bond diagram, thereby discovering a new mobile 6R linkage.
[ { "created": "Mon, 24 Feb 2014 09:45:18 GMT", "version": "v1" }, { "created": "Tue, 25 Feb 2014 16:07:23 GMT", "version": "v2" }, { "created": "Tue, 25 Aug 2015 09:21:15 GMT", "version": "v3" } ]
2015-08-26
[ [ "Li", "Zijia", "" ], [ "Schicho", "Josef", "" ] ]
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1402.5764
Richard McClatchey
Richard McClatchey, Andrew Branson and Jetendr Shamdasani
Designing Reusable Systems that Can Handle Change - Description-Driven Systems : Revisiting Object-Oriented Principles
8 pages, 1 figure and 1 table. Accepted by the 9th Int Conf on the Evaluation of Novel Approaches to Software Engineering (ENASE'14). Lisbon, Portugal. April 2014
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the age of the Cloud and so-called Big Data systems must be increasingly flexible, reconfigurable and adaptable to change in addition to being developed rapidly. As a consequence, designing systems to cater for evolution is becoming critical to their success. To be able to cope with change, systems must have the capability of reuse and the ability to adapt as and when necessary to changes in requirements. Allowing systems to be self-describing is one way to facilitate this. To address the issues of reuse in designing evolvable systems, this paper proposes a so-called description-driven approach to systems design. This approach enables new versions of data structures and processes to be created alongside the old, thereby providing a history of changes to the underlying data models and enabling the capture of provenance data. The efficacy of the description-driven approach is exemplified by the CRISTAL project. CRISTAL is based on description-driven design principles; it uses versions of stored descriptions to define various versions of data which can be stored in diverse forms. This paper discusses the need for capturing holistic system description when modelling large-scale distributed systems.
[ { "created": "Mon, 24 Feb 2014 09:48:15 GMT", "version": "v1" } ]
2014-02-25
[ [ "McClatchey", "Richard", "" ], [ "Branson", "Andrew", "" ], [ "Shamdasani", "Jetendr", "" ] ]
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1402.5766
Adriana Romero
Adriana Romero, Petia Radeva and Carlo Gatta
No more meta-parameter tuning in unsupervised sparse feature learning
null
null
null
null
cs.LG cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a meta-parameter free, off-the-shelf, simple and fast unsupervised feature learning algorithm, which exploits a new way of optimizing for sparsity. Experiments on STL-10 show that the method presents state-of-the-art performance and provides discriminative features that generalize well.
[ { "created": "Mon, 24 Feb 2014 09:49:04 GMT", "version": "v1" } ]
2014-02-25
[ [ "Romero", "Adriana", "" ], [ "Radeva", "Petia", "" ], [ "Gatta", "Carlo", "" ] ]
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1402.5768
Richard McClatchey
David Manset, Richard McClatchey and Herve Verjus
Model Driven Engineering for Science Gateways
10 pages, 6 figures and 1 table. 14th International Conference on Enterprise Information Systems (ICEIS) Vol 2 pp 421-431 ISBN 978-989-8565-11-2 . Wroclaw, Poland. July 2012
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
From n-Tier client/server applications, to more complex academic Grids, or even the most recent and promising industrial Clouds, the last decade has witnessed significant developments in distributed computing. In spite of this conceptual heterogeneity, Service-Oriented Architectures (SOA) seem to have emerged as the common underlying abstraction paradigm. Suitable access to data and applications resident in SOAs via so-called Science Gateways has thus become a pressing need in various fields of science, in order to realize the benefits of Grid and Cloud infrastructures. In this context, authors have consolidated work from three complementary experiences in European projects, which have developed and deployed large-scale production quality infrastructures as Science Gateways to support research in breast cancer, paediatric diseases and neurodegenerative pathologies respectively. In analysing the requirements from these biomedical applications the authors were able to elaborate on commonly faced Grid development issues, while proposing an adaptable and extensible engineering framework for Science Gateways. This paper thus proposes the application of an architecture-centric Model-Driven Engineering (MDE) approach to service-oriented developments, making it possible to define Science Gateways that satisfy quality of service requirements, execution platform and distribution criteria at design time. An novel investigation is presented on the applicability of the resulting grid MDE (gMDE) to specific examples, and conclusions are drawn on the benefits of this approach and its possible application to other areas, in particular that of Distributed Computing Infrastructures (DCI) interoperability.
[ { "created": "Mon, 24 Feb 2014 09:56:34 GMT", "version": "v1" } ]
2014-02-25
[ [ "Manset", "David", "" ], [ "McClatchey", "Richard", "" ], [ "Verjus", "Herve", "" ] ]
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1402.5769
Atsushi Miyauchi
Tomomi Matsui, Noriyoshi Sukegawa, Atsushi Miyauchi
Fractional programming formulation for the vertex coloring problem
6 pages, 5 tables
Information Processing Letters 114, 706-709 (2014)
10.1016/j.ipl.2014.06.010
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We devise a new formulation for the vertex coloring problem. Different from other formulations, decision variables are associated with the pairs of vertices. Consequently, colors will be distinguishable. Although the objective function is fractional, it can be replaced by a piece-wise linear convex function. Numerical experiments show that our formulation has significantly good performance for dense graphs.
[ { "created": "Mon, 24 Feb 2014 10:01:07 GMT", "version": "v1" } ]
2015-01-12
[ [ "Matsui", "Tomomi", "" ], [ "Sukegawa", "Noriyoshi", "" ], [ "Miyauchi", "Atsushi", "" ] ]
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1402.5770
Richard McClatchey
Theo Lynn, Philip Healy, Richard McClatchey, John Morrison, Claus Pahl and Brian Lee
The Case for Cloud Service Trustmarks and Assurance-as-a-Service
6 pages and 1 figure
null
null
3rd Int Conf on Cloud Computing and Services Science (CLOSER). Aachen, Germany May 2013. SciTePress
cs.DC cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cloud computing represents a significant economic opportunity for Europe. However, this growth is threatened by adoption barriers largely related to trust. This position paper examines trust and confidence issues in cloud computing and advances a case for addressing them through the implementation of a novel trustmark scheme for cloud service providers. The proposed trustmark would be both active and dynamic featuring multi-modal information about the performance of the underlying cloud service. The trustmarks would be informed by live performance data from the cloud service provider, or ideally an independent third-party accountability and assurance service that would communicate up-to-date information relating to service performance and dependability. By combining assurance measures with a remediation scheme, cloud service providers could both signal dependability to customers and the wider marketplace and provide customers, auditors and regulators with a mechanism for determining accountability in the event of failure or non-compliance. As a result, the trustmarks would convey to consumers of cloud services and other stakeholders that strong assurance and accountability measures are in place for the service in question and thereby address trust and confidence issues in cloud computing.
[ { "created": "Mon, 24 Feb 2014 10:05:04 GMT", "version": "v1" } ]
2014-02-25
[ [ "Lynn", "Theo", "" ], [ "Healy", "Philip", "" ], [ "McClatchey", "Richard", "" ], [ "Morrison", "John", "" ], [ "Pahl", "Claus", "" ], [ "Lee", "Brian", "" ] ]
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1402.5773
Richard McClatchey
Richard McClatchey
Data Management Challenges in Paediatric Information Systems
16 pages, 4 figures, 1 table. arXiv admin note: substantial text overlap with arXiv:0812.2874, arXiv:cs/0603036, arXiv:0707.0763
Chapter in From Physics into Daily Life - How Knowledge Transfer Changed Biology, Medicine and Healthcare. Ed B. Bressan. Wiley Publishers, 2014
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cs.DB cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There is a compelling demand for the data integration and exploitation of heterogeneous biomedical information for improved clinical practice, medical research, and personalised healthcare across the EU. The area of paediatric information integration is particularly challenging since the patients physiology changes with growth and different aspects of health being regularly monitored over extended periods of time. Paediatricians require access to heterogeneous data sets, often collected in different locations with different apparatus and over extended timescales. Using a Grid platform originally developed for physics at CERN and a novel integrated semantic data model the Health-e-Child project has developed an integrated healthcare platform for European paediatrics, providing seamless integration of traditional and emerging sources of biomedical data. The long-term goal of the project was to provide uninhibited access to universal biomedical knowledge repositories for personalised and preventive healthcare, large-scale information-based biomedical research and training, and informed policy making. The project built a Grid-enabled european network of leading clinical centres that can share and annotate paediatric data, can validate systems clinically, and diffuse clinical excellence across Europe by setting up new technologies, clinical workflows, and standards. The Health-e-Child project highlights data management challenges for the future of European paediatric healthcare and is the subject of this chapter.
[ { "created": "Mon, 24 Feb 2014 10:21:01 GMT", "version": "v1" } ]
2014-02-25
[ [ "McClatchey", "Richard", "" ] ]
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1402.5774
Da-Cheng Nie
Da-Cheng Nie, Ya-Hui An, Qiang Dong, Yan Fu and Tao Zhou
Information Filtering via Balanced Diffusion on Bipartite Networks
13 pages, 6 figures
null
null
null
cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent decade has witnessed the increasing popularity of recommender systems, which help users acquire relevant commodities and services from overwhelming resources on Internet. Some simple physical diffusion processes have been used to design effective recommendation algorithms for user-object bipartite networks, typically mass diffusion (MD) and heat conduction (HC) algorithms which have different advantages respectively on accuracy and diversity. In this paper, we investigate the effect of weight assignment in the hybrid of MD and HC, and find that a new hybrid algorithm of MD and HC with balanced weights will achieve the optimal recommendation results, we name it balanced diffusion (BD) algorithm. Numerical experiments on three benchmark data sets, MovieLens, Netflix and RateYourMusic (RYM), show that the performance of BD algorithm outperforms the existing diffusion-based methods on the three important recommendation metrics, accuracy, diversity and novelty. Specifically, it can not only provide accurately recommendation results, but also yield higher diversity and novelty in recommendations by accurately recommending unpopular objects.
[ { "created": "Mon, 24 Feb 2014 10:26:39 GMT", "version": "v1" } ]
2014-02-25
[ [ "Nie", "Da-Cheng", "" ], [ "An", "Ya-Hui", "" ], [ "Dong", "Qiang", "" ], [ "Fu", "Yan", "" ], [ "Zhou", "Tao", "" ] ]
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1402.5776
Jean-Luc Robyr Dr.
Jean-Luc Robyr, Paul Knowles and Antoine Weis
Measurement of the scalar third-order electric polarizability of the Cs ground state using CPT-spectroscopy in Ramsey geometry
15 pages, 16 figures
null
null
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The AC Stark shift induced by blackbody radiation is a major source of systematic uncertainty in present-day cesium microwave frequency standards. The shift is parametrized in terms of a third-order electric polarizability $\alpha_0^{(3)}$ that can be inferred from the static electric field displacement of the clock transition resonance. In this paper, we report on an all-optical CPT pump-probe experiment measuring the differential polarizability $\Delta \alpha_0^{(3)} = \alpha_0^{(3)}(F{=}4) - \alpha_0^{(3)}(F{=}3)$ on a thermal Cs atomic beam, from which we infer $ \alpha_0^{(3)}(F{=}4) = 2.023(6)_{stat}(9)_{syst}~Hz/(kV/cm)^2$, which corresponds to a scalar Stark shift parameter $ k_{s} = -2.312(7)_{stat}(10)_{syst}~Hz/(kV/cm)^2$. The result agrees within two standard deviations with a recent measurement in an atomic fountain, and rules out another recent result obtained in a Cs vapor cell.
[ { "created": "Mon, 24 Feb 2014 10:28:11 GMT", "version": "v1" } ]
2014-02-25
[ [ "Robyr", "Jean-Luc", "" ], [ "Knowles", "Paul", "" ], [ "Weis", "Antoine", "" ] ]
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1402.5781
Karthik Ramachandra
Karthik Ramachandra and Mahendra Chavan and Ravindra Guravannavar and S Sudarshan
Program Transformations for Asynchronous and Batched Query Submission
14 pages
null
10.1109/TKDE.2014.2334302
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The performance of database/Web-service backed applications can be significantly improved by asynchronous submission of queries/requests well ahead of the point where the results are needed, so that results are likely to have been fetched already when they are actually needed. However, manually writing applications to exploit asynchronous query submission is tedious and error-prone. In this paper we address the issue of automatically transforming a program written assuming synchronous query submission, to one that exploits asynchronous query submission. Our program transformation method is based on data flow analysis and is framed as a set of transformation rules. Our rules can handle query executions within loops, unlike some of the earlier work in this area. We also present a novel approach that, at runtime, can combine multiple asynchronous requests into batches, thereby achieving the benefits of batching in addition to that of asynchronous submission. We have built a tool that implements our transformation techniques on Java programs that use JDBC calls; our tool can be extended to handle Web service calls. We have carried out a detailed experimental study on several real-life applications, which shows the effectiveness of the proposed rewrite techniques, both in terms of their applicability and the performance gains achieved.
[ { "created": "Mon, 24 Feb 2014 10:39:44 GMT", "version": "v1" } ]
2014-07-29
[ [ "Ramachandra", "Karthik", "" ], [ "Chavan", "Mahendra", "" ], [ "Guravannavar", "Ravindra", "" ], [ "Sudarshan", "S", "" ] ]
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1402.5782
Waldemar Ulmer H
W. Ulmer
A new calculation formula of the nuclear cross-section of therapeutic protons
Preprint
null
null
null
physics.med-ph
http://creativecommons.org/licenses/by/3.0/
We have previously developed for nuclear cross-sections of therapeutic protons a calculation model, which is founded on the collective model as well as a quantum mechanical many particle problem to derive the S matrix and transition probabilities. In this communication, we show that the resonances can be derived by shifted Gaussian functions, whereas the unspecific nuclear interaction compounds can be represented by an error function, which also provides the asymptotic behavior. The energy shifts can be interpreted in terms of necessary domains of energy to excite typical nuclear processes. Thus the necessary formulas referring to previous calculations of nuclear cross-sections will be represented in section 2. The mass number AN determines the strong interaction range. The threshold energy ETh of the energy barrier is determined by the condition Estrong = ECoulomb. A linear combination of Gaussians, which contain additional energy shifts, and an error function incorporate a possible representation of Fermi-Dirac statistics, which is applied here to nuclear excitations and reaction with release of secondary particles. The new calculation formula provides a better understanding of different types of resonances occurring in nuclear interactions with protons. The present study is mainly a continuation of previous papers.
[ { "created": "Mon, 24 Feb 2014 10:44:41 GMT", "version": "v1" } ]
2014-02-25
[ [ "Ulmer", "W.", "" ] ]
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1402.5783
Karim Abu-Affash
Karim Abu-Affash, Paz Carmi and Anat Parush Tzur
Dual Power Assignment via Second Hamiltonian Cycle
null
null
null
null
cs.DM cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A power assignment is an assignment of transmission power to each of the wireless nodes of a wireless network, so that the induced graph satisfies some desired properties. The cost of a power assignment is the sum of the assigned powers. In this paper, we consider the dual power assignment problem, in which each wireless node is assigned a high- or low-power level, so that the induced graph is strongly connected and the cost of the assignment is minimized. We improve the best known approximation ratio from $\frac{\pi^2}{6}-\frac{1}{36}+\epsilon\thickapprox 1.617$ to $\frac{11}{7}\thickapprox 1.571$. Moreover, we show that the algorithm of Khuller et al. for the strongly connected spanning subgraph problem, which achieves an approximation ratio of $1.61$, is $1.522$-approximation algorithm for symmetric directed graphs. The innovation of this paper is in achieving these results via utilizing interesting properties for the existence of a second Hamiltonian cycle.
[ { "created": "Mon, 24 Feb 2014 10:44:53 GMT", "version": "v1" } ]
2014-02-25
[ [ "Abu-Affash", "Karim", "" ], [ "Carmi", "Paz", "" ], [ "Tzur", "Anat Parush", "" ] ]
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1402.5784
Daniel Quevedo E
Yuzhe Li, Daniel E. Quevedo, Vincent Lau, Subhrakanti Dey and Ling Shi
Transmission Power Scheduling for Energy Harvesting Sensor in Remote State Estimation
Extended version of article to be published in the Proceedings of the 19th IFAC World Congress, 2014
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null
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math.OC cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study remote estimation in a wireless sensor network. Instead of using a conventional battery-powered sensor, a sensor equipped with an energy harvester which can obtain energy from the external environment is utilized. We formulate this problem into an infinite time-horizon Markov decision process and provide the optimal sensor transmission power control strategy. In addition, a sub-optimal strategy which is easier to implement and requires less computation is presented. A numerical example is provided to illustrate the implementation of the sub-optimal policy and evaluation of its estimation performance.
[ { "created": "Mon, 24 Feb 2014 10:49:14 GMT", "version": "v1" } ]
2014-02-25
[ [ "Li", "Yuzhe", "" ], [ "Quevedo", "Daniel E.", "" ], [ "Lau", "Vincent", "" ], [ "Dey", "Subhrakanti", "" ], [ "Shi", "Ling", "" ] ]
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1402.5792
Seyed Mostafa Kia
Seyed Mostafa Kia, Hossein Rahmani, Reza Mortezaei, Mohsen Ebrahimi Moghaddam, Amer Namazi
A Novel Scheme for Intelligent Recognition of Pornographic Images
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Harmful contents are rising in internet day by day and this motivates the essence of more research in fast and reliable obscene and immoral material filtering. Pornographic image recognition is an important component in each filtering system. In this paper, a new approach for detecting pornographic images is introduced. In this approach, two new features are suggested. These two features in combination with other simple traditional features provide decent difference between porn and non-porn images. In addition, we applied fuzzy integral based information fusion to combine MLP (Multi-Layer Perceptron) and NF (Neuro-Fuzzy) outputs. To test the proposed method, performance of system was evaluated over 18354 download images from internet. The attained precision was 93% in TP and 8% in FP on training dataset, and 87% and 5.5% on test dataset. Achieved results verify the performance of proposed system versus other related works.
[ { "created": "Mon, 24 Feb 2014 11:15:04 GMT", "version": "v1" }, { "created": "Wed, 25 Jun 2014 14:04:13 GMT", "version": "v2" }, { "created": "Mon, 29 Sep 2014 22:15:26 GMT", "version": "v3" } ]
2014-10-01
[ [ "Kia", "Seyed Mostafa", "" ], [ "Rahmani", "Hossein", "" ], [ "Mortezaei", "Reza", "" ], [ "Moghaddam", "Mohsen Ebrahimi", "" ], [ "Namazi", "Amer", "" ] ]
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1402.5797
Zoltan Donko
P. Magyar, Z. Donko, G. J. Kalman, K. I. Golden
Linear and quadratic static response functions and structure functions in Yukawa liquids
null
null
10.1103/PhysRevE.90.023102
null
physics.plasm-ph cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We compute linear and quadratic static density response functions of three-dimensional Yukawa liquids by applying an external perturbation potential in molecular dynamics simulations. The response functions are also obtained from the equilibrium fluctuations (static structure factors) in the system via the fluctuation-dissipation theorems. The good agreement of the quadratic response functions, obtained in the two different ways confirms the quadratic fluctuation-dissipation theorem. We also find that the three-point structure function may be factorizable into two-point structure functions, leading to a cluster representation of the equilibrium triplet correlation function.
[ { "created": "Mon, 24 Feb 2014 11:49:09 GMT", "version": "v1" } ]
2015-06-18
[ [ "Magyar", "P.", "" ], [ "Donko", "Z.", "" ], [ "Kalman", "G. J.", "" ], [ "Golden", "K. I.", "" ] ]
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1402.5802
Christophe Vaillant
C L Vaillant, M P A Jones and R M Potvliege
Multichannel Quantum Defect Theory of Strontium Rydberg Series
22 pages, 14 figures
J. Phys. B: At. Mol. Opt. Phys. 47 (2014) 155001
10.1088/0953-4075/47/15/155001
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using the reactance matrix approach, we systematically develop new multichannel quantum defect theory models for the singlet and triplet S, P, D and F states of strontium based on improved energy level measurements. The new models reveal additional insights into the character of doubly excited perturber states, and the improved energy level measurements for certain series allow fine structure to be resolved for those series' perturbers. Comparison between the predictions of the new models and those of previous empirical and \emph{ab initio} studies reveals good agreement with most series, however some discrepancies are highlighted. Using the multichannel quantum defect theory wave functions derived from our models we calculate other observables such as Land\'e $g_J$-factors and radiative lifetimes. The analysis reveals the impact of perturbers on the Rydberg state properties of divalent atoms, highlighting the importance of including two-electron effects in the calculations of these properties. The work enables future investigations of properties such as Stark maps and long-range interactions of Rydberg states of strontium.
[ { "created": "Mon, 24 Feb 2014 11:53:24 GMT", "version": "v1" } ]
2014-07-17
[ [ "Vaillant", "C L", "" ], [ "Jones", "M P A", "" ], [ "Potvliege", "R M", "" ] ]
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1402.5803
Fabien Lauer
Fabien Lauer (LORIA), Henrik Ohlsson
Sparse phase retrieval via group-sparse optimization
null
null
null
null
cs.IT cs.LG math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper deals with sparse phase retrieval, i.e., the problem of estimating a vector from quadratic measurements under the assumption that few components are nonzero. In particular, we consider the problem of finding the sparsest vector consistent with the measurements and reformulate it as a group-sparse optimization problem with linear constraints. Then, we analyze the convex relaxation of the latter based on the minimization of a block l1-norm and show various exact recovery and stability results in the real and complex cases. Invariance to circular shifts and reflections are also discussed for real vectors measured via complex matrices.
[ { "created": "Mon, 24 Feb 2014 11:55:04 GMT", "version": "v1" } ]
2014-02-25
[ [ "Lauer", "Fabien", "", "LORIA" ], [ "Ohlsson", "Henrik", "" ] ]
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1402.5805
Eric Hitimana
Eric Hitimana and Oubong Gwun
Automatic Estimation of Live Coffee Leaf Infection based on Image Processing Techniques
SIPP 2014 : Second International Conference on Signal, Image Processing and Pattern Recognition,Sydney, Australia
null
10.5121/csit.2014.4221
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Image segmentation is the most challenging issue in computer vision applications. And most difficulties for crops management in agriculture are the lack of appropriate methods for detecting the leaf damage for pests treatment. In this paper we proposed an automatic method for leaf damage detection and severity estimation of coffee leaf by avoiding defoliation. After enhancing the contrast of the original image using LUT based gamma correction, the image is processed to remove the background, and the output leaf is clustered using Fuzzy c-means segmentation in V channel of YUV color space to maximize all leaf damage detection, and finally, the severity of leaf is estimated in terms of ratio for leaf pixel distribution between the normal and the detected leaf damage. The results in each proposed method was compared to the current researches and the accuracy is obvious either in the background removal or damage detection.
[ { "created": "Mon, 24 Feb 2014 12:06:40 GMT", "version": "v1" } ]
2014-02-25
[ [ "Hitimana", "Eric", "" ], [ "Gwun", "Oubong", "" ] ]
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1402.5814
Fei Xu
Fei Xu, Jun-long Kou, Jin-hui Chen, Ye Chen and Yan-qing Lu
Platform for enhanced light-graphene interaction length and miniaturizing fiber stereo-devices
6 figures
Optica, Vol. 1, Iss. 5, p. 307 (2014)
10.1364/OPTICA.1.000307
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Sufficient light-matter interactions are important for waveguide-coupled graphene optoelectronic devices. Using a microfiber-based lab-on-a-rod technique, we present a platform for ultra-long light-graphene interaction and design graphene-integrated helical microfiber (MF) devices. Using this approach, we experimentally demonstrate an in-line stereo polarizer by wrapping an MF on a rod pretreated with a graphene sheet. The device operates as a broadband (450 nm wavelength) polarizer capable of achieving an extinction ratio (ER) as high as ~8 dB/coil in the telecommunication band. Furthermore, we extend this approach to successfully demonstrate a high-Q graphene-based single-polarization resonator, which operates with an ER of ~11 dB with excellent suppression of polarization noise. The fiber-coil resonator shows great potential for sensing applications and gyro-integration. By specializing the rod surface and coil geometry, we believe the preliminary results reported herein could contribute to advancing the research for lab-on-a-rod graphene-MF-integrated devices.
[ { "created": "Mon, 24 Feb 2014 13:02:39 GMT", "version": "v1" } ]
2015-01-06
[ [ "Xu", "Fei", "" ], [ "Kou", "Jun-long", "" ], [ "Chen", "Jin-hui", "" ], [ "Chen", "Ye", "" ], [ "Lu", "Yan-qing", "" ] ]
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1402.5818
Mohammad Tofighi
Mohammad Tofighi, Alican Bozkurt, and A. Enis Cetin
Deconvolution Using Projections Onto The Epigraph Set of a Convex Cost Function
arXiv admin note: text overlap with arXiv:1309.0700, arXiv:1402.2088
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cs.DS math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new deconvolution algorithm based on orthogonal projections onto the epigraph set of a convex cost function is presented. In this algorithm, the dimension of the minimization problem is lifted by one and sets corresponding to the cost function are defined. As the utilized cost function is a convex function in $R^N$, the corresponding epigraph set is also a convex set in $R^{N+1}$. The deconvolution algorithm starts with an arbitrary initial estimate in $R^{N+1}$. At each step of the iterative algorithm, first deconvolution projections are performed onto the epigraphs, later an orthogonal projection is performed onto one of the constraint sets associated with the cost function in a sequential manner. The method provides globally optimal solutions for total-variation, $\ell_1$, $\ell_2$, and entropic cost functions.
[ { "created": "Mon, 24 Feb 2014 13:26:50 GMT", "version": "v1" } ]
2014-02-25
[ [ "Tofighi", "Mohammad", "" ], [ "Bozkurt", "Alican", "" ], [ "Cetin", "A. Enis", "" ] ]
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1402.5830
Luca Vassio Mr
Enrico Ampellio and Luca Vassio
A hybrid swarm-based algorithm for single-objective optimization problems involving high-cost analyses
19 pages, 4 figures, Springer Swarm Intelligence
Swarm Intelligence 10, 99-121 (2016)
10.1007/s11721-016-0121-6
null
math.OC cs.AI cs.DC cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In many technical fields, single-objective optimization procedures in continuous domains involve expensive numerical simulations. In this context, an improvement of the Artificial Bee Colony (ABC) algorithm, called the Artificial super-Bee enhanced Colony (AsBeC), is presented. AsBeC is designed to provide fast convergence speed, high solution accuracy and robust performance over a wide range of problems. It implements enhancements of the ABC structure and hybridizations with interpolation strategies. The latter are inspired by the quadratic trust region approach for local investigation and by an efficient global optimizer for separable problems. Each modification and their combined effects are studied with appropriate metrics on a numerical benchmark, which is also used for comparing AsBeC with some effective ABC variants and other derivative-free algorithms. In addition, the presented algorithm is validated on two recent benchmarks adopted for competitions in international conferences. Results show remarkable competitiveness and robustness for AsBeC.
[ { "created": "Mon, 24 Feb 2014 14:06:52 GMT", "version": "v1" }, { "created": "Mon, 2 May 2016 14:55:37 GMT", "version": "v2" } ]
2021-05-05
[ [ "Ampellio", "Enrico", "" ], [ "Vassio", "Luca", "" ] ]
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1402.5831
J\"org Meyer
J\"org Meyer and Karsten Reuter
Modeling Heat Dissipation at the Nanoscale: An Embedding Approach for Chemical Reaction Dynamics on Metal Surfaces
6 pages, 2 figures
Angew. Chem. Int. Ed. 53, 4721 (2014)
10.1002/anie.201400066
null
cond-mat.mtrl-sci cond-mat.mes-hall cond-mat.stat-mech physics.chem-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an embedding technique for metallic systems that makes it possible to model energy dissipation into substrate phonons during surface chemical reactions from first principles. The separation of chemical and elastic contributions to the interaction potential provides a quantitative description of both electronic and phononic band structure. Application to the dissociation of O$_2$ at Pd(100) predicts translationally "hot" oxygen adsorbates as a consequence of the released adsorption energy (ca. 2.6 eV). This finding questions the instant thermalization of reaction enthalpies generally assumed in models of heterogeneous catalysis.
[ { "created": "Mon, 24 Feb 2014 14:17:12 GMT", "version": "v1" }, { "created": "Fri, 14 Mar 2014 16:25:49 GMT", "version": "v2" }, { "created": "Tue, 13 May 2014 14:36:11 GMT", "version": "v3" } ]
2014-05-14
[ [ "Meyer", "Jörg", "" ], [ "Reuter", "Karsten", "" ] ]
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1402.5835
J\'er\^ome Kunegis
J\'er\^ome Kunegis
Polcovar: Software for Computing the Mean and Variance of Subgraph Counts in Random Graphs
5 pages; fixed some wording; added link to Github
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cs.MS
http://creativecommons.org/licenses/by-sa/4.0/
The mean and variance of the number of appearances of a given subgraph $H$ in an Erd\H{o}s--R\'enyi random graph over $n$ nodes are rational polynomials in $n$. We present a piece of software named Polcovar (from "polynomial" and "covariance") that computes the exact rational coefficients of these polynomials in function of $H$.
[ { "created": "Mon, 24 Feb 2014 14:26:08 GMT", "version": "v1" }, { "created": "Wed, 4 May 2016 20:34:48 GMT", "version": "v2" } ]
2016-05-06
[ [ "Kunegis", "Jérôme", "" ] ]
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1402.5836
David Duvenaud
David Duvenaud, Oren Rippel, Ryan P. Adams, Zoubin Ghahramani
Avoiding pathologies in very deep networks
Fixed a typo regarding number of layers
null
null
null
stat.ML cs.LG
http://creativecommons.org/licenses/by-nc-sa/4.0/
Choosing appropriate architectures and regularization strategies for deep networks is crucial to good predictive performance. To shed light on this problem, we analyze the analogous problem of constructing useful priors on compositions of functions. Specifically, we study the deep Gaussian process, a type of infinitely-wide, deep neural network. We show that in standard architectures, the representational capacity of the network tends to capture fewer degrees of freedom as the number of layers increases, retaining only a single degree of freedom in the limit. We propose an alternate network architecture which does not suffer from this pathology. We also examine deep covariance functions, obtained by composing infinitely many feature transforms. Lastly, we characterize the class of models obtained by performing dropout on Gaussian processes.
[ { "created": "Mon, 24 Feb 2014 14:27:40 GMT", "version": "v1" }, { "created": "Sun, 14 Sep 2014 21:50:47 GMT", "version": "v2" }, { "created": "Fri, 8 Jul 2016 22:59:45 GMT", "version": "v3" } ]
2016-07-12
[ [ "Duvenaud", "David", "" ], [ "Rippel", "Oren", "" ], [ "Adams", "Ryan P.", "" ], [ "Ghahramani", "Zoubin", "" ] ]
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Avoiding pathologies in very deep networks
http://arxiv.org/abs/1402.5836v3
http://arxiv.org/pdf/1402.5836v3.pdf
https://github.com/duvenaud/additive-gps
false
false
https://paperswithcode.com/paper/avoiding-pathologies-in-very-deep-networks
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1402.5839
Klaus Frahm
K. M. Frahm and D. L. Shepelyansky
Poisson statistics of PageRank probabilities of Twitter and Wikipedia networks
4 pages, 4 figures http://www.quantware.ups-tlse.fr/
Eur. Phys. J. B (2014) 87: 93
10.1140/epjb/e2014-50123-4
null
physics.soc-ph cond-mat.stat-mech nlin.CD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use the methods of quantum chaos and Random Matrix Theory for analysis of statistical fluctuations of PageRank probabilities in directed networks. In this approach the effective energy levels are given by a logarithm of PageRank probability at a given node. After the standard energy level unfolding procedure we establish that the nearest spacing distribution of PageRank probabilities is described by the Poisson law typical for integrable quantum systems. Our studies are done for the Twitter network and three networks of Wikipedia editions in English, French and German. We argue that due to absence of level repulsion the PageRank order of nearby nodes can be easily interchanged. The obtained Poisson law implies that the nearby PageRank probabilities fluctuate as random independent variables.
[ { "created": "Mon, 24 Feb 2014 14:40:35 GMT", "version": "v1" } ]
2014-04-18
[ [ "Frahm", "K. M.", "" ], [ "Shepelyansky", "D. L.", "" ] ]
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1402.5843
Gabriele Fici
Julien Cassaigne, Gabriele Fici, Marinella Sciortino, Luca Q. Zamboni
Cyclic Complexity of Words
To appear in Journal of Combinatorial Theory, Series A
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null
null
cs.FL cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce and study a complexity function on words $c_x(n),$ called \emph{cyclic complexity}, which counts the number of conjugacy classes of factors of length $n$ of an infinite word $x.$ We extend the well-known Morse-Hedlund theorem to the setting of cyclic complexity by showing that a word is ultimately periodic if and only if it has bounded cyclic complexity. Unlike most complexity functions, cyclic complexity distinguishes between Sturmian words of different slopes. We prove that if $x$ is a Sturmian word and $y$ is a word having the same cyclic complexity of $x,$ then up to renaming letters, $x$ and $y$ have the same set of factors. In particular, $y$ is also Sturmian of slope equal to that of $x.$ Since $c_x(n)=1$ for some $n\geq 1$ implies $x$ is periodic, it is natural to consider the quantity $\liminf_{n\rightarrow \infty} c_x(n).$ We show that if $x$ is a Sturmian word, then $\liminf_{n\rightarrow \infty} c_x(n)=2.$ We prove however that this is not a characterization of Sturmian words by exhibiting a restricted class of Toeplitz words, including the period-doubling word, which also verify this same condition on the limit infimum. In contrast we show that, for the Thue-Morse word $t$, $\liminf_{n\rightarrow \infty} c_t(n)=+\infty.$
[ { "created": "Mon, 24 Feb 2014 14:49:22 GMT", "version": "v1" }, { "created": "Mon, 28 Apr 2014 15:37:23 GMT", "version": "v2" }, { "created": "Mon, 23 Jun 2014 13:18:54 GMT", "version": "v3" }, { "created": "Tue, 26 May 2015 13:58:28 GMT", "version": "v4" }, { "created": "Tue, 28 Jun 2016 07:37:08 GMT", "version": "v5" } ]
2016-06-29
[ [ "Cassaigne", "Julien", "" ], [ "Fici", "Gabriele", "" ], [ "Sciortino", "Marinella", "" ], [ "Zamboni", "Luca Q.", "" ] ]
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1402.5845
Priyanka Sharma
Priyanka Sharma and Garimella Rama Murthy
Mathematical Modelling of Energy Wastage in Absence of Levelling and Sectoring in Wireless Sensor Networks
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null
null
null
cs.IT cs.NI math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we quantitatively (mathematically) reason the energy savings achieved by the Leveling and Sectoring protocol. Due to the energy constraints on the sensor nodes (in terms of supply of energy) energy awareness has become crucial in networking protocol stack. The understanding of routing protocols along with energy awareness in a network would help in energy opti-mization with efficient routing .We provide analytical modelling of the energy wastage in the absence of Leveling and Sectoring protocol by considering the network in the form of binary tree, nested tree and Q-ary tree. The simulation results reflect the energy wastage in the absence of Levelling and Sectoring based hybrid protocol.
[ { "created": "Mon, 24 Feb 2014 14:56:17 GMT", "version": "v1" } ]
2014-02-25
[ [ "Sharma", "Priyanka", "" ], [ "Murthy", "Garimella Rama", "" ] ]
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1402.5857
Kitty Meeks
Kitty Meeks
The challenges of unbounded treewidth in parameterised subgraph counting problems
Survey part of paper substantially extended and reorganised; some additional figures added to illustrate proofs
null
null
null
cs.CC cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Parameterised subgraph counting problems are the most thoroughly studied topic in the theory of parameterised counting, and there has been significant recent progress in this area. Many of the existing tractability results for parameterised problems which involve finding or counting subgraphs with particular properties rely on bounding the treewidth of these subgraphs in some sense; here, we prove a number of hardness results for the situation in which this bounded treewidth condition does not hold, resulting in dichotomies for some special cases of the general subgraph counting problem. The paper also gives a thorough survey of known results on this subject and the methods used, as well as discussing the relationships both between multicolour and uncoloured versions of subgraph counting problems, and between exact counting, approximate counting and the corresponding decision problems.
[ { "created": "Mon, 24 Feb 2014 15:34:17 GMT", "version": "v1" }, { "created": "Fri, 29 May 2015 10:47:04 GMT", "version": "v2" } ]
2015-06-01
[ [ "Meeks", "Kitty", "" ] ]
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1402.5859
Huanguo Zhang
Huanguo Zhang, Sha Lv, Wei Li and Xun Qu
A Novel Face Recognition Method using Nearest Line Projection
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Face recognition is a popular application of pat- tern recognition methods, and it faces challenging problems including illumination, expression, and pose. The most popular way is to learn the subspaces of the face images so that it could be project to another discriminant space where images of different persons can be separated. In this paper, a nearest line projection algorithm is developed to represent the face images for face recognition. Instead of projecting an image to its nearest image, we try to project it to its nearest line spanned by two different face images. The subspaces are learned so that each face image to its nearest line is minimized. We evaluated the proposed algorithm on some benchmark face image database, and also compared it to some other image projection algorithms. The experiment results showed that the proposed algorithm outperforms other ones.
[ { "created": "Mon, 24 Feb 2014 15:36:32 GMT", "version": "v1" } ]
2014-02-25
[ [ "Zhang", "Huanguo", "" ], [ "Lv", "Sha", "" ], [ "Li", "Wei", "" ], [ "Qu", "Xun", "" ] ]
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1402.5860
Michael Eides
Michael I. Eides
On Some Recent Ideas on the Proton Radius Puzzle and Lepton Anomalous Magnetic Moments
10 pages, 2 figures
Phys. Rev. D 90, 057301 (2014)
10.1103/PhysRevD.90.057301
UK/13-05
hep-ph physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss recent suggestions on the resolution of the proton radius puzzle put forward in [1,2] and discovery of a nonperturbative quantum-electrodynamic contribution of order $(\alpha/\pi)^5$ to lepton anomalous magnetic moments announced in [3,4]. We demonstrate that the ideas of [1, 2] do not resolve the proton radius puzzle. We explain why the nonperturbative correction calculated in [3,4] does not exist.
[ { "created": "Mon, 24 Feb 2014 15:39:20 GMT", "version": "v1" } ]
2014-09-24
[ [ "Eides", "Michael I.", "" ] ]
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1402.5869
Hassan Zivari Fard
Hassan Zivari-Fard, Bahareh Akhbari, Mahmoud Ahmadian-Attari, Mohammad Reza Aref
Compound Multiple Access Channel with Confidential Messages
Accepted at IEEE ICC 2014. arXiv admin note: substantial text overlap with arXiv:1402.4799
null
10.1109/ICC.2014.6883604
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study the problem of secret communication over a Compound Multiple Access Channel (MAC). In this channel, we assume that one of the transmitted messages is confidential that is only decoded by its corresponding receiver and kept secret from the other receiver. For this proposed setting (compound MAC with confidential messages), we derive general inner and outer bounds on the secrecy capacity region. Also, as examples, we investigate 'Less noisy' and 'Gaussian' versions of this channel, and extend the results of the discrete memoryless version to these cases. Moreover, providing numerical examples for the Gaussian case, we illustrate the comparison between achievable rate regions of compound MAC and compound MAC with confidential messages.
[ { "created": "Mon, 24 Feb 2014 15:57:30 GMT", "version": "v1" } ]
2016-11-17
[ [ "Zivari-Fard", "Hassan", "" ], [ "Akhbari", "Bahareh", "" ], [ "Ahmadian-Attari", "Mahmoud", "" ], [ "Aref", "Mohammad Reza", "" ] ]
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1402.5874
Mohammad Ghasemi Hamed
Mohammad Ghasemi Hamed, Mathieu Serrurier, Nicolas Durand
Predictive Interval Models for Non-parametric Regression
This paper has been withdrawn by the authors due to multiple errors in the formulations and equations
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null
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cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Having a regression model, we are interested in finding two-sided intervals that are guaranteed to contain at least a desired proportion of the conditional distribution of the response variable given a specific combination of predictors. We name such intervals predictive intervals. This work presents a new method to find two-sided predictive intervals for non-parametric least squares regression without the homoscedasticity assumption. Our predictive intervals are built by using tolerance intervals on prediction errors in the query point's neighborhood. We proposed a predictive interval model test and we also used it as a constraint in our hyper-parameter tuning algorithm. This gives an algorithm that finds the smallest reliable predictive intervals for a given dataset. We also introduce a measure for comparing different interval prediction methods yielding intervals having different size and coverage. These experiments show that our methods are more reliable, effective and precise than other interval prediction methods.
[ { "created": "Mon, 24 Feb 2014 16:16:17 GMT", "version": "v1" }, { "created": "Mon, 21 Mar 2016 10:56:40 GMT", "version": "v2" } ]
2016-03-22
[ [ "Hamed", "Mohammad Ghasemi", "" ], [ "Serrurier", "Mathieu", "" ], [ "Durand", "Nicolas", "" ] ]
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1402.5876
Roberto Calandra
Roberto Calandra and Jan Peters and Carl Edward Rasmussen and Marc Peter Deisenroth
Manifold Gaussian Processes for Regression
8 pages, accepted to IJCNN 2016
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Off-the-shelf Gaussian Process (GP) covariance functions encode smoothness assumptions on the structure of the function to be modeled. To model complex and non-differentiable functions, these smoothness assumptions are often too restrictive. One way to alleviate this limitation is to find a different representation of the data by introducing a feature space. This feature space is often learned in an unsupervised way, which might lead to data representations that are not useful for the overall regression task. In this paper, we propose Manifold Gaussian Processes, a novel supervised method that jointly learns a transformation of the data into a feature space and a GP regression from the feature space to observed space. The Manifold GP is a full GP and allows to learn data representations, which are useful for the overall regression task. As a proof-of-concept, we evaluate our approach on complex non-smooth functions where standard GPs perform poorly, such as step functions and robotics tasks with contacts.
[ { "created": "Mon, 24 Feb 2014 16:19:51 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 14:59:49 GMT", "version": "v2" }, { "created": "Thu, 8 May 2014 10:02:40 GMT", "version": "v3" }, { "created": "Mon, 11 Apr 2016 11:07:31 GMT", "version": "v4" } ]
2016-04-12
[ [ "Calandra", "Roberto", "" ], [ "Peters", "Jan", "" ], [ "Rasmussen", "Carl Edward", "" ], [ "Deisenroth", "Marc Peter", "" ] ]
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Manifold Gaussian Processes for Regression
http://arxiv.org/abs/1402.5876v4
http://arxiv.org/pdf/1402.5876v4.pdf
https://github.com/nehap25/rlwithgp
false
false
https://paperswithcode.com/paper/manifold-gaussian-processes-for-regression
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1402.5877
Ping Lu
Ping Lu, Qin Li and Chaoqun Liu
Numerical Study of Mechanism of U-shaped Vortex Formation
49th AIAA Aerospace Sciences Meeting
null
null
null
physics.flu-dyn
http://creativecommons.org/licenses/by/3.0/
This paper illustrates the mechanism of U-shaped vortex formation which is found both by experiment and DNS. The main goal of this paper is to explain how the U-shaped vortex is formed and further develops. According to the results obtained by our direct numerical simulation with high order accuracy, the U-shaped vortex is part of the coherent vortex structure and is actually the tertiary streamwise vortices induced by the secondary vortices. The new finding is quite different from existing theories which describe that the U-shaped vortex is newly formed as the head of young turbulence spot and finally break down to small pieces. In addition, we find that the U-shaped vortex has the same vorticity sign as the original {\lambda}-shaped vortex tube legs and serves as a second neck to supply vorticity to the ringlike vortex when the original vortex tube is stretched and multiple rings are generated.
[ { "created": "Mon, 24 Feb 2014 16:20:13 GMT", "version": "v1" } ]
2014-02-25
[ [ "Lu", "Ping", "" ], [ "Li", "Qin", "" ], [ "Liu", "Chaoqun", "" ] ]
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1402.5878
Lucas Paletta
Alexandra Cetto, Michael Netter, G\"unther Pernul, Christian Richthammer, Moritz Riesner, Christian Roth, Johannes S\"anger
Friend Inspector: A Serious Game to Enhance Privacy Awareness in Social Networks
null
null
null
IDGEI/2014/01
cs.CY cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Currently, many users of Social Network Sites are insufficiently aware of who can see their shared personal items. Nonetheless, most approaches focus on enhancing privacy in Social Networks through improved privacy settings, neglecting the fact that privacy awareness is a prerequisite for privacy control. Social Network users first need to know about privacy issues before being able to make adjustments. In this paper, we introduce Friend Inspector, a serious game that allows its users to playfully increase their privacy awareness on Facebook. Since its launch, Friend Inspector has attracted a significant number of visitors, emphasising the need for better tools to understand privacy settings on Social Networks.
[ { "created": "Thu, 20 Feb 2014 15:26:15 GMT", "version": "v1" } ]
2014-02-25
[ [ "Cetto", "Alexandra", "" ], [ "Netter", "Michael", "" ], [ "Pernul", "Günther", "" ], [ "Richthammer", "Christian", "" ], [ "Riesner", "Moritz", "" ], [ "Roth", "Christian", "" ], [ "Sänger", "Johannes", "" ] ]
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1402.5881
Arman Farhang
Arman Farhang, Nicola Marchetti, Linda E. Doyle and Behrouz Farhang-Boroujeny
Filter Bank Multicarrier for Massive MIMO
7 pages, 6 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper introduces filter bank multicarrier (FBMC) as a potential candidate in the application of massive MIMO communication. It also points out the advantages of FBMC over OFDM (orthogonal frequency division multiplexing) in the application of massive MIMO. The absence of cyclic prefix in FBMC increases the bandwidth efficiency. In addition, FBMC allows carrier aggregation straightforwardly. Self-equalization, a property of FBMC in massive MIMO that is introduced in this paper, has the impact of reducing (i) complexity; (ii) sensitivity to carrier frequency offset (CFO); (iii) peak-to-average power ratio (PAPR); (iv) system latency; and (v) increasing bandwidth efficiency. The numerical results that corroborate these claims are presented.
[ { "created": "Mon, 24 Feb 2014 16:42:18 GMT", "version": "v1" } ]
2014-02-25
[ [ "Farhang", "Arman", "" ], [ "Marchetti", "Nicola", "" ], [ "Doyle", "Linda E.", "" ], [ "Farhang-Boroujeny", "Behrouz", "" ] ]
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1402.5882
Ping Lu
Huankun Fu, Ping Lu and Chaoqun Liu
Improvement of Mixing Function for Modified Upwinding Compact Scheme
49th AIAA Aerospace Sciences Meeting
null
null
null
physics.comp-ph math.NA
http://creativecommons.org/licenses/by/3.0/
The compact scheme has high order accuracy and high resolution, but cannot be used to capture the shock. WENO is a great scheme for shock capturing, but is too dissipative for turbulence and small length scales. We developed a modified upwinding compact scheme which uses an effective shock detector to block compact scheme to cross the shock and a control function to mix the flux with WENO scheme near the shock. The new scheme makes the original compact scheme able to capture the shock sharply and, more important, keep high order accuracy and high resolution in the smooth area, which is particularly important for shock boundary layer and shock acoustic interactions. This work is a continuation to modify the control function for the modified up-winding compact scheme (MUCS). Numerical results show the scheme is successful for 2-D Euler.
[ { "created": "Mon, 24 Feb 2014 16:44:18 GMT", "version": "v1" } ]
2014-02-25
[ [ "Fu", "Huankun", "" ], [ "Lu", "Ping", "" ], [ "Liu", "Chaoqun", "" ] ]
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1402.5885
Ping Lu
M. Oliveria, P. Lu, X. Liu and C. Liu
Universal High Order Subroutine with New Shock Detector for Shock Boundary Layer Interaction
47th AIAA Aerospace Sciences Meeting
null
null
null
physics.comp-ph
http://creativecommons.org/licenses/by/3.0/
The goal of this work is to develop a new universal high order subroutine for shock boundary layer interaction. First, an effective shock/discontinuity detector has been developed.The detector has two steps.The first step is to check the ratio of the truncation errors on the coarse and fine grids and the second step is to check the local ratio of the left and right slopes. The currently popular shock/discontinuity detectors can detect shock, but mistake high frequency waves and critical points as shock and then damp the physically important high frequency waves.Preliminary results show the new shock/discontinuity detector is very delicate and can detect all shocks including strong, weak and oblique shocks or discontinuity in function and the first, second, and third order derivatives without artificial constants, but never mistake high frequency waves and critical points, expansion waves as shock. This will overcome the bottle neck problem with numerical simulation for the shock-boundary layer interaction, shock-acoustic interaction, image process, porous media flow, multiple phase flow and anywhere the high frequency waves are important, but discontinuity exists and is mixed with high frequency waves. After detecting the shock we can then use one side high order scheme for shocks and high order central compact scheme for the rest if the shock is appropriately located. Then a high order universal subroutine for finite difference method is developed which can be used for any finite difference code for accurate numerical derivatives.
[ { "created": "Mon, 24 Feb 2014 16:55:10 GMT", "version": "v1" } ]
2014-02-25
[ [ "Oliveria", "M.", "" ], [ "Lu", "P.", "" ], [ "Liu", "X.", "" ], [ "Liu", "C.", "" ] ]
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1402.5886
Shervin Javdani
Shervin Javdani, Yuxin Chen, Amin Karbasi, Andreas Krause, J. Andrew Bagnell, Siddhartha Srinivasa
Near Optimal Bayesian Active Learning for Decision Making
Extended version of work appearing in the International conference on Artificial Intelligence and Statistics (AISTATS) 2014
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null
null
cs.LG cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
How should we gather information to make effective decisions? We address Bayesian active learning and experimental design problems, where we sequentially select tests to reduce uncertainty about a set of hypotheses. Instead of minimizing uncertainty per se, we consider a set of overlapping decision regions of these hypotheses. Our goal is to drive uncertainty into a single decision region as quickly as possible. We identify necessary and sufficient conditions for correctly identifying a decision region that contains all hypotheses consistent with observations. We develop a novel Hyperedge Cutting (HEC) algorithm for this problem, and prove that is competitive with the intractable optimal policy. Our efficient implementation of the algorithm relies on computing subsets of the complete homogeneous symmetric polynomials. Finally, we demonstrate its effectiveness on two practical applications: approximate comparison-based learning and active localization using a robot manipulator.
[ { "created": "Mon, 24 Feb 2014 16:59:21 GMT", "version": "v1" } ]
2014-02-25
[ [ "Javdani", "Shervin", "" ], [ "Chen", "Yuxin", "" ], [ "Karbasi", "Amin", "" ], [ "Krause", "Andreas", "" ], [ "Bagnell", "J. Andrew", "" ], [ "Srinivasa", "Siddhartha", "" ] ]
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1402.5888
Andrea Cavanna Mr.
Andrea Cavanna, Angela M. P\'erez, Felix Just, Maria V. Chekhova, Gerd Leuchs
Compensation of anisotropy effects in the generation of two-photon light
9 pages, 8 figures
null
10.1364/OE.22.009983
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyse a method to compensate for anisotropy effects in the spatial distribution of parametric down-conversion (PDC) radiation in bulk crystals. In this method, a single nonlinear crystal is replaced by two consecutive crystals with opposite transverse walk-off directions. We implement a simple numerical model to calculate the spatial distribution of intensity and correlations, as well as the Schmidt mode structure, with an account for the anisotropy. Experimental results are presented which prove the validity of both the model and the method.
[ { "created": "Mon, 24 Feb 2014 17:01:07 GMT", "version": "v1" } ]
2015-06-18
[ [ "Cavanna", "Andrea", "" ], [ "Pérez", "Angela M.", "" ], [ "Just", "Felix", "" ], [ "Chekhova", "Maria V.", "" ], [ "Leuchs", "Gerd", "" ] ]
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1402.5889
Ping Lu
Yonghua Yan, Caixia Chen, Ping Lu, Chaoqun Liu
LES Study on the Mechanism of Vortex Rings behind Supersonic MVG with Turbulent Inflow
50th AIAA Aerospace Sciences Meeting
null
null
null
physics.flu-dyn
http://creativecommons.org/licenses/by/3.0/
In this study, we investigate the interaction between vortex rings behind MVG and the oblique shocks in the MVG controlled ramp flow at M=2.5 and Req=5760. Implicit large eddy simulation (ILES) method is used by solving the unfiltered form of the Navier-Stokes equations with the 5th order Bandwidth-optimized WENO scheme. The fully developed inflow is given by a series of turbulent profiles obtained from previous DNS simulation. It shows that the ring structure does not break down and keeps its topology after penetrating the strong shock wave and the oblique shocks is influenced a lot by the induced flow field from rings. The bump of the 3D shock wave surface is discovered and its mechanism is explained.
[ { "created": "Mon, 24 Feb 2014 17:01:30 GMT", "version": "v1" } ]
2014-02-25
[ [ "Yan", "Yonghua", "" ], [ "Chen", "Caixia", "" ], [ "Lu", "Ping", "" ], [ "Liu", "Chaoqun", "" ] ]
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1402.5891
Ping Lu
Qin Li, Yonghua Yan, Ping Lu, Adam Pierce, Chaoqun Liu and Frank Lu
Numerical and Experimental Studies on the Separation Topology of the MVG Controlled Flow at M=2.5
49th AIAA Aerospace Sciences Meeting
null
null
null
physics.flu-dyn
http://creativecommons.org/licenses/by/3.0/
In this paper, the implicitly implemented LES method and fifth order bandwidth optimized WENO scheme are used to make comprehensive studies on the separation topology of the MVG controlled flow at M=2.5 and Re{\theta}=5760. Experiments are also made to verify the prediction of the computation. Analyses are conducted on three categories of the topology: the surface separation, cross-section separation and the three dimensional structure of the vortices. A complete description about the separation topology and a series of new findings are obtained. Among them, a pair of spiral point is first predicted by the computation and verified by the experiment. A corresponding new vortex model with 7 vortex tubes is presented also.
[ { "created": "Mon, 24 Feb 2014 17:06:47 GMT", "version": "v1" } ]
2014-02-25
[ [ "Li", "Qin", "" ], [ "Yan", "Yonghua", "" ], [ "Lu", "Ping", "" ], [ "Pierce", "Adam", "" ], [ "Liu", "Chaoqun", "" ], [ "Lu", "Frank", "" ] ]
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1402.5896
Ping Lu
Ping Lu and Chaoqun Liu
Numerical Study on Mechanism of Small Vortex Generation in Boundary Layer Transition
49th AIAA Aerospace Sciences Meeting. arXiv admin note: text overlap with arXiv:1402.5183
null
null
null
physics.flu-dyn
http://creativecommons.org/licenses/by/3.0/
The small vortex generation is a key issue of the mechanism for late flow transition and turbulence generation. It was widely accepted that small length vortices were generated by large vortex breakdown. According to our recent DNS, we find that the hairpin vortex structure is very stable and never breaks down to small pieces. On the other hand, we recognize that there are strong positive spikes besides the ring neck in the spanwise direction. The strongly positive spikes are caused by second sweeps which are generated by perfectly circular and perpendicularly standing vortex rings. The second sweep brings energy from the invisid region downdraft to the bottom of the boundary layers, which generates high shear layers around the positive spikes.Since the high shear layer is not stable, all small length scales (turbulence) are generated around high shear layers especially near the wall surface (bottom of boundary layers). This happens near the ring neck in the streamwise direction and besides the original vortex legs in the spanwise direction.The small length scales then rise up from the wall surface and travel to the upper boundary layer.
[ { "created": "Mon, 24 Feb 2014 17:15:56 GMT", "version": "v1" } ]
2014-02-25
[ [ "Lu", "Ping", "" ], [ "Liu", "Chaoqun", "" ] ]
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1402.5897
Elmar Peise
Elmar Peise (1), Paolo Bientinesi (1) ((1) AICES, RWTH Aachen)
A Study on the Influence of Caching: Sequences of Dense Linear Algebra Kernels
Submitted to the Ninth International Workshop on Automatic Performance Tuning (iWAPT2014)
null
null
AICES-2014/02-1
cs.MS cs.NA cs.PF
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is universally known that caching is critical to attain high- performance implementations: In many situations, data locality (in space and time) plays a bigger role than optimizing the (number of) arithmetic floating point operations. In this paper, we show evidence that at least for linear algebra algorithms, caching is also a crucial factor for accurate performance modeling and performance prediction.
[ { "created": "Fri, 21 Feb 2014 12:23:19 GMT", "version": "v1" } ]
2014-02-25
[ [ "Peise", "Elmar", "", "AICES, RWTH Aachen" ], [ "Bientinesi", "Paolo", "", "AICES, RWTH Aachen" ] ]
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1402.5900
Ilya Dodin
I. Y. Dodin and N. J. Fisch
Ponderomotive forces on waves in modulated media
null
null
10.1103/PhysRevLett.112.205002
null
physics.plasm-ph math-ph math.MP nlin.SI physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nonlinear interactions of waves via instantaneous cross-phase modulation can be cast in the same way as ponderomotive wave-particle interactions in high-frequency electromagnetic field. The ponderomotive effect arises when rays of a probe wave scatter off perturbations of the underlying medium produced by a second, modulation wave, much like charged particles scatter off a quasiperiodic field. Parallels with the point-particle dynamics, which itself is generalized by this theory, lead to new methods of wave manipulation, including asymmetric barriers for light.
[ { "created": "Mon, 24 Feb 2014 17:32:04 GMT", "version": "v1" } ]
2015-06-18
[ [ "Dodin", "I. Y.", "" ], [ "Fisch", "N. J.", "" ] ]
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1402.5902
Felix X. Yu
Felix X. Yu, Krzysztof Choromanski, Sanjiv Kumar, Tony Jebara, Shih-Fu Chang
On Learning from Label Proportions
null
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Learning from Label Proportions (LLP) is a learning setting, where the training data is provided in groups, or "bags", and only the proportion of each class in each bag is known. The task is to learn a model to predict the class labels of the individual instances. LLP has broad applications in political science, marketing, healthcare, and computer vision. This work answers the fundamental question, when and why LLP is possible, by introducing a general framework, Empirical Proportion Risk Minimization (EPRM). EPRM learns an instance label classifier to match the given label proportions on the training data. Our result is based on a two-step analysis. First, we provide a VC bound on the generalization error of the bag proportions. We show that the bag sample complexity is only mildly sensitive to the bag size. Second, we show that under some mild assumptions, good bag proportion prediction guarantees good instance label prediction. The results together provide a formal guarantee that the individual labels can indeed be learned in the LLP setting. We discuss applications of the analysis, including justification of LLP algorithms, learning with population proportions, and a paradigm for learning algorithms with privacy guarantees. We also demonstrate the feasibility of LLP based on a case study in real-world setting: predicting income based on census data.
[ { "created": "Mon, 24 Feb 2014 17:40:09 GMT", "version": "v1" }, { "created": "Wed, 11 Feb 2015 23:38:42 GMT", "version": "v2" } ]
2015-02-13
[ [ "Yu", "Felix X.", "" ], [ "Choromanski", "Krzysztof", "" ], [ "Kumar", "Sanjiv", "" ], [ "Jebara", "Tony", "" ], [ "Chang", "Shih-Fu", "" ] ]
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On Learning from Label Proportions
http://arxiv.org/abs/1402.5902v2
http://arxiv.org/pdf/1402.5902v2.pdf
https://github.com/felixyu/pSVM
true
true
https://paperswithcode.com/paper/on-learning-from-label-proportions
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1402.5904
Stefan Hougardy
Stefan Hougardy
On the Integrality Ratio of the Subtour LP for Euclidean TSP
null
null
null
null
cs.DM cs.DS math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A long standing conjecture says that the integrality ratio of the subtour LP for metric TSP is $4/3$. A well known family of graphic TSP instances achieves this lower bound asymptotically. For Euclidean TSP the best known lower bound on the integrality ratio was $8/7$. We improve this value by presenting a family of Euclidean TSP instances for which the integrality ratio of the subtour LP converges to 4/3.
[ { "created": "Mon, 24 Feb 2014 17:44:30 GMT", "version": "v1" }, { "created": "Thu, 6 Mar 2014 09:40:16 GMT", "version": "v2" }, { "created": "Sun, 24 Aug 2014 11:51:43 GMT", "version": "v3" } ]
2014-08-26
[ [ "Hougardy", "Stefan", "" ] ]
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1402.5906
Marco Fossati
Marco Fossati and Luigi Quartapelle
The Riemann Problem for Hyperbolic Equations under a Nonconvex Flux with Two Inflection Points
104 pages, 71 figures. Preliminary results presented at 18eme Seminaire on la Mecanique des Fluides Numerique, Institut Henri Poincare, Paris, France, January 2006
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physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This report addresses the solution of Riemann problems for hyperbolic equations when the nonlinear characteristic fields loose their genuine nonlinearity. In this context, exact solvers for nonconvex 1D Riemann problems are developed. First a scalar conservation law for a nonconvex flux with two inflection points is studied. Then the P-system for an isothermal version of the van der Waals gas model is examined in a range of temperatures allowing for a nonconvex pressure function. Eventually the system of the Euler equations of gasdynamics is considered for the polytropic van der Waals gas. In this case, a suitably large specific heat is considered such that the isentropes display a local loss of convexity near the saturation curve and the critical point. Such a nonconvex physical model allows for nonclassical waves to appear as a result of the change of sign of the fundamental derivative of gasdynamics. The solution of the Riemann problem for the considered real gas model reduces to a system of two nonlinear equations for the values of the density on the two sides of the contact discontinuity, much in the same manner of a recently proposed solution method for gases admitting nonlinear wavefields only fully genuine. Solutions containing nonclassical and mixed waves are presented for the three mathematical models. Vacuum formation is described analytically including the presence of composite rarefaction waves, and to the best of authors knowledge, produced numerically here for the first time.
[ { "created": "Mon, 24 Feb 2014 17:46:18 GMT", "version": "v1" } ]
2014-02-25
[ [ "Fossati", "Marco", "" ], [ "Quartapelle", "Luigi", "" ] ]
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1402.5909
Giorgio Sonnino
Giorgio Sonnino, Gy\"orgy Steinbrecher and Alberto Sonnino
The R\'enyi entropy of L\'evy distribution
10 pages, 0 figures
null
null
null
physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The equivalence between non-extensive C. Tsallis entropy and the extensive entropy introduced by Alfr\'ed R\'enyi is discussed. The R\'enyi entropy is studied from the perspective of the geometry of the Lebesgue and generalised, exotic Lebesgue spaces. A duality principle is established. The R\'enyi entropy for the L\'evy distribution, in the domain when the nunerical methods fails, is approximated by asymptotic expansion for the large values of the R\'enyi parameter.
[ { "created": "Mon, 24 Feb 2014 18:04:11 GMT", "version": "v1" } ]
2014-02-25
[ [ "Sonnino", "Giorgio", "" ], [ "Steinbrecher", "György", "" ], [ "Sonnino", "Alberto", "" ] ]
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1402.5910
Mike Schacht
M. Schacht, M.M. Schauer
Shelving and Probe Efficiency in Trapped Ion Experiments
null
null
10.1088/0953-4075/47/16/165002
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A generalized probe sequence typical of trapped ion experiments using shelving is studied. Detection efficiency is analyzed for finite shelved state lifetimes and using multi-modal count distributions. Multi-modal distributions are more appropriate for measurements that use a small number of ions than the simple Poisson counting statistics usually considered and have a larger variance that may be significant in determining uncertainties and in making weighted fits. Optimal probe times and the resulting state detection efficiency and sensitivity are determined for arbitrary cooling rates, initial states and shelved state lifetimes, in terms of a probe coherence time {\tau}p. A universal optimal probe time of tp ~ 0.43{\tau}p is shown to give an almost optimal probe sensitivity for most systems.
[ { "created": "Mon, 24 Feb 2014 18:06:28 GMT", "version": "v1" } ]
2015-06-18
[ [ "Schacht", "M.", "" ], [ "Schauer", "M. M.", "" ] ]
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1402.5912
Jinyuan Chen
Jinyuan Chen, Petros Elia and Syed Ali Jafar
On the Vector Broadcast Channel with Alternating CSIT: A Topological Perspective
Shorter version will be presented at ISIT 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In many wireless networks, link strengths are affected by many topological factors such as different distances, shadowing and inter-cell interference, thus resulting in some links being generally stronger than other links. From an information theoretic point of view, accounting for such topological aspects has remained largely unexplored, despite strong indications that such aspects can crucially affect transceiver and feedback design, as well as the overall performance. The work here takes a step in exploring this interplay between topology, feedback and performance. This is done for the two user broadcast channel with random fading, in the presence of a simple two-state topological setting of statistically strong vs. weaker links, and in the presence of a practical ternary feedback setting of alternating channel state information at the transmitter (alternating CSIT) where for each channel realization, this CSIT can be perfect, delayed, or not available. In this setting, the work derives generalized degrees-of-freedom bounds and exact expressions, that capture performance as a function of feedback statistics and topology statistics. The results are based on novel topological signal management (TSM) schemes that account for topology in order to fully utilize feedback. This is achieved for different classes of feedback mechanisms of practical importance, from which we identify specific feedback mechanisms that are best suited for different topologies. This approach offers further insight on how to split the effort --- of channel learning and feeding back CSIT --- for the strong versus for the weaker link. Further intuition is provided on the possible gains from topological spatio-temporal diversity, where topology changes in time and across users.
[ { "created": "Mon, 24 Feb 2014 18:10:02 GMT", "version": "v1" }, { "created": "Sun, 20 Apr 2014 21:01:16 GMT", "version": "v2" } ]
2014-04-22
[ [ "Chen", "Jinyuan", "" ], [ "Elia", "Petros", "" ], [ "Jafar", "Syed Ali", "" ] ]
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1402.5915
Michael Wilkinson
Michel Vo{\ss}kuhle, Alain Pumir, Emmanuel L\'ev\^eque and Michael Wilkinson
Collision rate for suspensions at large Stokes numbers - comparing Navier-Stokes and synthetic turbulence
9 pages, 3 figures
null
10.1080/14685248.2014.948628
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The use of simplified models of turbulent flows provides an appealing possibility to study the collision rate of turbulent suspensions, especially in conditions relevant to astrophysics, which require large time scale separations. To check the validity of such approaches, we used a direct numerical simulation (DNS) velocity field, which satisfies the Navier-Stokes equations (although it neglects the effect of the suspended particles on the flow field), and a kinematic simulation (KS) velocity field, which is a random field designed so that its statistics are in accord with the Kolmogorov theory for fully-developed turbulence. In the limit where the effects of particle inertia (characterised by the Stokes number) are negligible, the collision rates from the two approaches agree. As the Stokes number St increases, however, we show that the DNS collision rate exceeds the KS collision rate by orders of magnitude. We propose an explanation for this phenomenon and explore its consequences. We discuss the collision rate $R$ for particles in high Reynolds number flows at large Stokes number, and present evidence that $R\propto \sqrt{{\rm St}}$.
[ { "created": "Mon, 24 Feb 2014 18:33:59 GMT", "version": "v1" } ]
2016-04-06
[ [ "Voßkuhle", "Michel", "" ], [ "Pumir", "Alain", "" ], [ "Lévêque", "Emmanuel", "" ], [ "Wilkinson", "Michael", "" ] ]
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1402.5922
Alexander Kurz
Adriana Balan (University Politehnica of Bucharest), Alexander Kurz (University of Leicester), Ji\v{r}\'i Velebil (Faculty of Electrical Engineering, Czech Technical University in Prague, Czech Republic)
Positive fragments of coalgebraic logics
51 pages; accepted for publication; expanded and improved version of the previous submission. Proposition 4.15 is new; Section 6 was rewritten in view of new results (theorem 6.9, proposition 6.14, paragraphs A-D); references added
Logical Methods in Computer Science, Volume 11, Issue 3 (September 22, 2015) lmcs:1594
10.2168/LMCS-11(3:18)2015
null
math.CT cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Positive modal logic was introduced in an influential 1995 paper of Dunn as the positive fragment of standard modal logic. His completeness result consists of an axiomatization that derives all modal formulas that are valid on all Kripke frames and are built only from atomic propositions, conjunction, disjunction, box and diamond. In this paper, we provide a coalgebraic analysis of this theorem, which not only gives a conceptual proof based on duality theory, but also generalizes Dunn's result from Kripke frames to coalgebras for weak-pullback preserving functors. To facilitate this analysis we prove a number of category theoretic results on functors on the categories $\mathsf{Set}$ of sets and $\mathsf{Pos}$ of posets: Every functor $\mathsf{Set} \to \mathsf{Pos}$ has a $\mathsf{Pos}$-enriched left Kan extension $\mathsf{Pos} \to \mathsf{Pos}$. Functors arising in this way are said to have a presentation in discrete arities. In the case that $\mathsf{Set} \to \mathsf{Pos}$ is actually $\mathsf{Set}$-valued, we call the corresponding left Kan extension $\mathsf{Pos} \to \mathsf{Pos}$ its posetification. A $\mathsf{Set}$-functor preserves weak pullbacks if and only if its posetification preserves exact squares. A $\mathsf{Pos}$-functor with a presentation in discrete arities preserves surjections. The inclusion $\mathsf{Set} \to \mathsf{Pos}$ is dense. A functor $\mathsf{Pos} \to \mathsf{Pos}$ has a presentation in discrete arities if and only if it preserves coinserters of `truncated nerves of posets'. A functor $\mathsf{Pos} \to \mathsf{Pos}$ is a posetification if and only if it preserves coinserters of truncated nerves of posets and discrete posets. A locally monotone endofunctor of an ordered variety has a presentation by monotone operations and equations if and only if it preserves $\mathsf{Pos}$-enriched sifted colimits.
[ { "created": "Mon, 24 Feb 2014 19:20:00 GMT", "version": "v1" }, { "created": "Wed, 29 Apr 2015 18:45:51 GMT", "version": "v2" }, { "created": "Mon, 18 May 2015 16:02:33 GMT", "version": "v3" }, { "created": "Mon, 21 Sep 2015 18:46:32 GMT", "version": "v4" } ]
2017-01-11
[ [ "Balan", "Adriana", "", "University Politehnica of Bucharest" ], [ "Kurz", "Alexander", "", "University of Leicester" ], [ "Velebil", "Jiří", "", "Faculty of Electrical\n Engineering, Czech Technical University in Prague, Czech Republic" ] ]
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1402.5923
Tatiana Tommasi
Tatiana Tommasi, Tinne Tuytelaars, Barbara Caputo
A Testbed for Cross-Dataset Analysis
null
null
null
December 2013, Technical Report: KUL/ESAT/PSI/1304
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Since its beginning visual recognition research has tried to capture the huge variability of the visual world in several image collections. The number of available datasets is still progressively growing together with the amount of samples per object category. However, this trend does not correspond directly to an increasing in the generalization capabilities of the developed recognition systems. Each collection tends to have its specific characteristics and to cover just some aspects of the visual world: these biases often narrow the effect of the methods defined and tested separately over each image set. Our work makes a first step towards the analysis of the dataset bias problem on a large scale. We organize twelve existing databases in a unique corpus and we present the visual community with a useful feature repository for future research.
[ { "created": "Mon, 24 Feb 2014 19:25:17 GMT", "version": "v1" } ]
2014-02-25
[ [ "Tommasi", "Tatiana", "" ], [ "Tuytelaars", "Tinne", "" ], [ "Caputo", "Barbara", "" ] ]
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1402.5927
Stefan B\"auml
Stefan B\"auml, Matthias Christandl, Karol Horodecki, Andreas Winter
Limitations on Quantum Key Repeaters
11+38 pages, 4 figures, Statements for exact p-bits weakened as non-locking bound on measured relative entropy distance contained an error
Nature Communications 6, Article number: 6908, 2015
10.1038/ncomms7908
null
quant-ph cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A major application of quantum communication is the distribution of entangled particles for use in quantum key distribution (QKD). Due to noise in the communication line, QKD is in practice limited to a distance of a few hundred kilometres, and can only be extended to longer distances by use of a quantum repeater, a device which performs entanglement distillation and quantum teleportation. The existence of noisy entangled states that are undistillable but nevertheless useful for QKD raises the question of the feasibility of a quantum key repeater, which would work beyond the limits of entanglement distillation, hence possibly tolerating higher noise levels than existing protocols. Here we exhibit fundamental limits on such a device in the form of bounds on the rate at which it may extract secure key. As a consequence, we give examples of states suitable for QKD but unsuitable for the most general quantum key repeater protocol.
[ { "created": "Mon, 24 Feb 2014 19:40:55 GMT", "version": "v1" }, { "created": "Tue, 10 Mar 2015 18:04:52 GMT", "version": "v2" } ]
2015-04-28
[ [ "Bäuml", "Stefan", "" ], [ "Christandl", "Matthias", "" ], [ "Horodecki", "Karol", "" ], [ "Winter", "Andreas", "" ] ]
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1402.5928
Carlos J. Zapata-Rodr\'iguez
Carlos J. Zapata-Rodriguez and Mahin Naserpour
Nonparaxial shape-preserving Airy beams with Bessel signature
null
null
10.1364/OL.39.002507
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spatially accelerating beams that are solutions to the Maxwell equations may propagate along incomplete circular trajectories, after which diffraction broadening takes over and the beams spread out. Taking these truncated Bessel wave fields to the paraxial limit, some authors sustained that it is recovered the known Airy beams (AiBs). Based on the angular spectrum representation of optical fields, we demonstrated that the paraxial approximation rigorously leads to off-axis focused beams instead of finite-energy AiBs. The latter will arise under the umbrella of a nonparaxial approach following elliptical trajectories in place of parabolas. Deviations from full-wave simulations appear more severely in beam positioning rather than its local profile.
[ { "created": "Mon, 24 Feb 2014 19:41:21 GMT", "version": "v1" } ]
2015-06-18
[ [ "Zapata-Rodriguez", "Carlos J.", "" ], [ "Naserpour", "Mahin", "" ] ]
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1402.5945
Konstantin Ziegler
Konstantin Ziegler
Tame Decompositions and Collisions
null
null
null
null
math.AC cs.SC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A univariate polynomial f over a field is decomposable if f = g o h = g(h) for nonlinear polynomials g and h. It is intuitively clear that the decomposable polynomials form a small minority among all polynomials over a finite field. The tame case, where the characteristic p of Fq does not divide n = deg f, is fairly well-understood, and we have reasonable bounds on the number of decomposables of degree n. Nevertheless, no exact formula is known if $n$ has more than two prime factors. In order to count the decomposables, one wants to know, under a suitable normalization, the number of collisions, where essentially different (g, h) yield the same f. In the tame case, Ritt's Second Theorem classifies all 2-collisions. We introduce a normal form for multi-collisions of decompositions of arbitrary length with exact description of the (non)uniqueness of the parameters. We obtain an efficiently computable formula for the exact number of such collisions at degree n over a finite field of characteristic coprime to p. This leads to an algorithm for the exact number of decomposable polynomials at degree n over a finite field Fq in the tame case.
[ { "created": "Mon, 24 Feb 2014 20:57:07 GMT", "version": "v1" } ]
2014-03-03
[ [ "Ziegler", "Konstantin", "" ] ]
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Tame Decompositions and Collisions
https://arxiv.org/abs/1402.5945v1
https://arxiv.org/pdf/1402.5945v1.pdf
https://github.com/zieglerk/polynomial_decomposition
false
false
https://paperswithcode.com/paper/tame-decompositions-and-collisions
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1402.5947
Lorenzo Iorio
Lorenzo Iorio
Post-Newtonian direct and mixed orbital effects due to the oblateness of the central body
LaTex2e, 60 pages, 93 references, no figures, 2 tables. Sign error corrected in Eq. (98)
Int. J. Mod. Phys. D24 (2015) 1550067
10.1142/S0218271815500674
null
gr-qc astro-ph.EP physics.geo-ph physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The orbital dynamics of a test particle moving in the non-spherically symmetric field of a rotating oblate primary is impacted also by certain indirect, mixed effects arising from the interplay of the different Newtonian and post-Newtonian accelerations which induce known direct perturbations. We systematically calculate the indirect gravitoelectromagnetic shifts per orbit of the Keplerian orbital elements of the test particle arising from the crossing among the first even zonal harmonic $J_2$ of the central body and the post-Newtonian static and stationary components of its gravitational field. We also work out the Newtonian shifts per orbit of order $J_2^2$, and the direct post-Newtonian gravitoelectric effects of order $J_2 c^{-2}$ arising from the equations of motion. In the case of both the indirect and direct gravitoelectric $J_2 c^{-2}$ shifts, our calculation holds for an arbitrary orientation of the symmetry axis of the central body. We yield numerical estimates of their relative magnitudes for systems ranging from Earth artificial satellites to stars orbiting supermassive black holes.
[ { "created": "Sat, 22 Feb 2014 15:20:18 GMT", "version": "v1" }, { "created": "Sun, 2 Mar 2014 15:33:10 GMT", "version": "v2" }, { "created": "Mon, 11 Aug 2014 14:15:03 GMT", "version": "v3" }, { "created": "Mon, 23 Mar 2015 14:07:57 GMT", "version": "v4" }, { "created": "Mon, 15 Jun 2015 13:37:09 GMT", "version": "v5" }, { "created": "Wed, 4 Oct 2017 22:57:10 GMT", "version": "v6" } ]
2017-10-06
[ [ "Iorio", "Lorenzo", "" ] ]
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1402.5950
Hans Raj Tiwary
David Avis, Hans Raj Tiwary
A generalization of extension complexity that captures $P$
null
null
null
null
cs.CC math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we propose a generalization of the extension complexity of a polyhedron $Q$. On the one hand it is general enough so that all problems in $P$ can be formulated as linear programs with polynomial size extension complexity. On the other hand it still allows non-polynomial lower bounds to be proved for $NP$-hard problems independently of whether or not $P=NP$. The generalization, called $H$-free extension complexity, allows for a set of valid inequalities $H$ to be excluded in computing the extension complexity of $Q$. We give results on the $H$-free extension complexity of hard matching problems (when $H$ are the odd set inequalities) and the traveling salesman problem (when $H$ are the subtour elimination constraints).
[ { "created": "Sun, 23 Feb 2014 18:34:38 GMT", "version": "v1" }, { "created": "Fri, 11 Apr 2014 13:30:50 GMT", "version": "v2" } ]
2014-04-14
[ [ "Avis", "David", "" ], [ "Tiwary", "Hans Raj", "" ] ]
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1402.5951
Zhen Kan
Zhen Kan, John M. Shea, and Warren E. Dixon
Navigation Function Based Decentralized Control of A Multi-Agent System with Network Connectivity Constraints
16 pages, 9 figures, submitted to NATO Science for Peace and Security Series by IOS Press. arXiv admin note: substantial text overlap with arXiv:1402.5639
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A wide range of applications require or can benefit from collaborative behavior of a group of agents. The technical challenge addressed in this chapter is the development of a decentralized control strategy that enables each agent to independently navigate to ensure agents achieve a collective goal while maintaining network connectivity. Specifically, cooperative controllers are developed for networked agents with limited sensing and network connectivity constraints. By modeling the interaction among the agents as a graph, several different approaches to address the problems of preserving network connectivity are presented, with the focus on a method that utilizes navigation function frameworks. By modeling network connectivity constraints as artificial obstacles in navigation functions, a decentralized control strategy is presented in two particular applications, formation control and rendezvous for a system of autonomous agents, which ensures global convergence to the unique minimum of the potential field (i.e., desired formation or desired destination) while preserving network connectivity. Simulation results are provided to demonstrate the developed strategy.
[ { "created": "Sun, 23 Feb 2014 21:48:04 GMT", "version": "v1" } ]
2014-02-26
[ [ "Kan", "Zhen", "" ], [ "Shea", "John M.", "" ], [ "Dixon", "Warren E.", "" ] ]
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1402.5953
Richard McClatchey
Andrew Branson, Jetendr Shamdasani, Richard McClatchey
A Description Driven Approach for Flexible Metadata Tracking
10 pages and 3 figures. arXiv admin note: text overlap with arXiv:1402.5753, arXiv:1402.5764
7th ESA International Conference on Ensuring Long-Term Preservation and Adding Value to Scientific and Technical Data (PV 2013) 4--6th November 2013. Frascati, Italy
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cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Evolving user requirements presents a considerable software engineering challenge, all the more so in an environment where data will be stored for a very long time, and must remain usable as the system specification evolves around it. Capturing the description of the system addresses this issue since a description-driven approach enables new versions of data structures and processes to be created alongside the old, thereby providing a history of changes to the underlying data models and enabling the capture of provenance data. This description-driven approach is advocated in this paper in which a system called CRISTAL is presented. CRISTAL is based on description-driven principles; it can use previous versions of stored descriptions to define various versions of data which can be stored in various forms. To demonstrate the efficacy of this approach the history of the project at CERN is presented where CRISTAL was used to track data and process definitions and their associated provenance data in the construction of the CMS ECAL detector, how it was applied to handle analysis tracking and data index provenance in the neuGRID and N4U projects, and how it will be matured further in the CRISTAL-ISE project. We believe that the CRISTAL approach could be invaluable in handling the evolution, indexing and tracking of large datasets, and are keen to apply it further in this direction.
[ { "created": "Mon, 24 Feb 2014 10:09:30 GMT", "version": "v1" } ]
2014-02-26
[ [ "Branson", "Andrew", "" ], [ "Shamdasani", "Jetendr", "" ], [ "McClatchey", "Richard", "" ] ]
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1402.5958
Younes Ra'di
M. S. Mirmoosa, Y. Ra'di, V. S. Asadchy, C. R. Simovski, and S. A. Tretyakov
Polarizabilities of nonreciprocal bianisotropic particles
10 pages, 9 figures
Phys. Rev. Applied, vol. 1, no. 3, p. 034005, Feb. 2014
10.1103/PhysRevApplied.1.034005
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For two electrically small nonreciprocal scatterers an analytical electromagnetic model of polarizabilities is developed. Both particles are bianisotropic: the so-called Tellegen-omega particle and moving-chiral particle. Analytical results are compared to the full-wave numerical simulations. Both models satisfy to main physical restrictions and leave no doubts in the possibility to realize these particles experimentally. This paper is a necessary step towards applications of nonreciprocal bianisotropic particles such as perfect electromagnetic isolators, twist polarizers, thin-sheet phase shifters, and other devices.
[ { "created": "Mon, 24 Feb 2014 19:44:15 GMT", "version": "v1" }, { "created": "Thu, 27 Feb 2014 07:55:16 GMT", "version": "v2" } ]
2014-06-16
[ [ "Mirmoosa", "M. S.", "" ], [ "Ra'di", "Y.", "" ], [ "Asadchy", "V. S.", "" ], [ "Simovski", "C. R.", "" ], [ "Tretyakov", "S. A.", "" ] ]
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1402.5963
Philip Mocz
Philip Mocz (Harvard/CfA), Mark Vogelsberger (MIT), Lars Hernquist (Harvard/CfA)
A Constrained Transport Scheme for MHD on Unstructured Static and Moving Meshes
13 pages, 9 figures, accepted to MNRAS. Animations available at http://www.cfa.harvard.edu/~pmocz/research.html
null
10.1093/mnras/stu865
null
astro-ph.IM astro-ph.CO physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Magnetic fields play an important role in many astrophysical systems and a detailed understanding of their impact on the gas dynamics requires robust numerical simulations. Here we present a new method to evolve the ideal magnetohydrodynamic (MHD) equations on unstructured static and moving meshes that preserves the magnetic field divergence-free constraint to machine precision. The method overcomes the major problems of using a cleaning scheme on the magnetic fields instead, which is non-conservative, not fully Galilean invariant, does not eliminate divergence errors completely, and may produce incorrect jumps across shocks. Our new method is a generalization of the constrained transport (CT) algorithm used to enforce the $\nabla\cdot \mathbf{B}=0$ condition on fixed Cartesian grids. Preserving $\nabla\cdot \mathbf{B}=0$ at the discretized level is necessary to maintain the orthogonality between the Lorentz force and $\mathbf{B}$. The possibility of performing CT on a moving mesh provides several advantages over static mesh methods due to the quasi-Lagrangian nature of the former (i.e., the mesh generating points move with the flow), such as making the simulation automatically adaptive and significantly reducing advection errors. Our method preserves magnetic fields and fluid quantities in pure advection exactly.
[ { "created": "Mon, 24 Feb 2014 21:00:24 GMT", "version": "v1" }, { "created": "Sat, 17 May 2014 21:11:03 GMT", "version": "v2" } ]
2015-06-18
[ [ "Mocz", "Philip", "", "Harvard/CfA" ], [ "Vogelsberger", "Mark", "", "MIT" ], [ "Hernquist", "Lars", "", "Harvard/CfA" ] ]
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1402.5966
Andrew Ringsmuth
Andrew K. Ringsmuth
Multiscale Analysis and Optimisation of Photosynthetic Solar Energy Systems
PhD Thesis, Institute for Molecular Bioscience, The University of Queensland. 278 pages, 44 figures, 3 published papers included. Detailed abstract on page i
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physics.bio-ph cond-mat.soft nlin.AO physics.chem-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work asks how light harvesting in photosynthetic systems can be optimised for economically scalable, sustainable energy production. Hierarchy theory is introduced as a system-analysis and optimisation tool better able to handle multiscale, multiprocess complexities in photosynthetic energetics compared with standard linear-process analysis. Within this framework, new insights are given into relationships between composition, structure and energetics at the scale of the thylakoid membrane, and also into how components at different scales cooperate under functional objectives of the whole photosynthetic system. Combining these reductionistic and holistic analyses creates a platform for modelling multiscale-optimal, idealised photosynthetic systems in silico.
[ { "created": "Mon, 24 Feb 2014 21:00:32 GMT", "version": "v1" } ]
2014-02-26
[ [ "Ringsmuth", "Andrew K.", "" ] ]
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1402.5973
Peter McIntyre
Saeed Assadi, Chase Collins, Peter McIntyre, James Gerity, Joshua Kellams, Thomas Mann, Christopher Mathewson, Nathaniel Pogue, Akhdiyor Sattarov, and Richard York
Higgs Factory and 100 TeV Hadron Collider: Opportunity for a New World Laboratory within a Decade
10 pages, 6 figures
null
null
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Suggestions have been made for a 80-100 km circumference Future Circular Collider (FCC) that could ultimately contain a circular e+e- ring collider operating as a Higgs Factory as well as a 100 TeV hadron collider. Those suggestions have motivated us to propose an approach in which the project is sited at the location at the SSC tunnel, which has the lowest tunnel cost ever. The low tunnel cost would make it cost-effective to locate the 100 TeV Hadron Collider in a 270 km circumference tunne, using 4.5 Tesla superconducting magnets. The SSC tunnel itself would be used to house the Higgs Factory and the injector for the Hadron Collider. The injector for the Higgs Factory would be also used as a driver for an X-ray Free Electron Laser with unique capabilities for protein crystallography. The location of the project at a location with favorable geotechnology for minimum-cost tunneling, and low-cost/low-risk technology for the SRF and superconducting magnets, open the possibility to build the proposed laboratory within a decade.
[ { "created": "Mon, 24 Feb 2014 21:01:04 GMT", "version": "v1" } ]
2014-02-26
[ [ "Assadi", "Saeed", "" ], [ "Collins", "Chase", "" ], [ "McIntyre", "Peter", "" ], [ "Gerity", "James", "" ], [ "Kellams", "Joshua", "" ], [ "Mann", "Thomas", "" ], [ "Mathewson", "Christopher", "" ], [ "Pogue", "Nathaniel", "" ], [ "Sattarov", "Akhdiyor", "" ], [ "York", "Richard", "" ] ]
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1402.5979
Renato J Cintra
V. A. Coutinho, R. J. Cintra, F. M. Bayer, S. Kulasekera, A. Madanayake
A Multiplierless Pruned DCT-like Transformation for Image and Video Compression that Requires 10 Additions Only
13 pages, 4 figures, 5 tables
Journal of Real-Time Image Processing, August 2016, Volume 12, Issue 2, pp 247-255
10.1007/s11554-015-0492-8
null
cs.MM cs.CV stat.ME
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A multiplierless pruned approximate 8-point discrete cosine transform (DCT) requiring only 10 additions is introduced. The proposed algorithm was assessed in image and video compression, showing competitive performance with state-of-the-art methods. Digital implementation in 45 nm CMOS technology up to place-and-route level indicates clock speed of 288 MHz at a 1.1 V supply. The 8x8 block rate is 36 MHz.The DCT approximation was embedded into HEVC reference software; resulting video frames, at up to 327 Hz for 8-bit RGB HEVC, presented negligible image degradation.
[ { "created": "Mon, 24 Feb 2014 21:04:41 GMT", "version": "v1" }, { "created": "Sun, 11 Dec 2016 19:23:57 GMT", "version": "v2" } ]
2016-12-13
[ [ "Coutinho", "V. A.", "" ], [ "Cintra", "R. J.", "" ], [ "Bayer", "F. M.", "" ], [ "Kulasekera", "S.", "" ], [ "Madanayake", "A.", "" ] ]
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1402.5983
Charles Santori
Charles Santori, Jason S. Pelc, Raymond G. Beausoleil, Nikolas Tezak, Ryan Hamerly, and Hideo Mabuchi
Quantum noise in large-scale coherent nonlinear photonic circuits
Revised
Phys. Rev. Applied 1, 054005 (2014)
null
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A semiclassical simulation approach is presented for studying quantum noise in large-scale photonic circuits incorporating an ideal Kerr nonlinearity. A circuit solver is used to generate matrices defining a set of stochastic differential equations, in which the resonator field variables represent random samplings of the Wigner quasi-probability distributions. Although the semiclassical approach involves making a large-photon-number approximation, tests on one- and two-resonator circuits indicate satisfactory agreement between the semiclassical and full-quantum simulation results in the parameter regime of interest. The semiclassical model is used to simulate random errors in a large-scale circuit that contains 88 resonators and hundreds of components in total, and functions as a 4-bit ripple counter. The error rate as a function of on-state photon number is examined, and it is observed that the quantum fluctuation amplitudes do not increase as signals propagate through the circuit, an important property for scalability.
[ { "created": "Mon, 24 Feb 2014 21:14:52 GMT", "version": "v1" }, { "created": "Tue, 27 May 2014 19:01:15 GMT", "version": "v2" } ]
2014-07-15
[ [ "Santori", "Charles", "" ], [ "Pelc", "Jason S.", "" ], [ "Beausoleil", "Raymond G.", "" ], [ "Tezak", "Nikolas", "" ], [ "Hamerly", "Ryan", "" ], [ "Mabuchi", "Hideo", "" ] ]
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1402.5984
Melanie JI Muller PhD
Melanie JI Muller, Beverly I Neugeboren, David R Nelson, Andrew W Murray
Genetic drift opposes mutualism during spatial population expansion
12 pages main text, 20 pages SI
Proc. Natl. Acad. Sci. USA 111, 1037-1042 (2014)
10.1073/pnas.1313285111
null
q-bio.PE physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mutualistic interactions benefit both partners, promoting coexistence and genetic diversity. Spatial structure can promote cooperation, but spatial expansions may also make it hard for mutualistic partners to stay together, since genetic drift at the expansion front creates regions of low genetic and species diversity. To explore the antagonism between mutualism and genetic drift, we grew cross-feeding strains of the budding yeast S. cerevisiae on agar surfaces as a model for mutualists undergoing spatial expansions. By supplying varying amounts of the exchanged nutrients, we tuned strength and symmetry of the mutualistic interaction. Strong mutualism suppresses genetic demixing during spatial expansions and thereby maintains diversity, but weak or asymmetric mutualism is overwhelmed by genetic drift even when mutualism is still beneficial, slowing growth and reducing diversity. Theoretical modeling using experimentally measured parameters predicts the size of demixed regions and how strong mutualism must be to survive a spatial expansion.
[ { "created": "Mon, 24 Feb 2014 21:15:27 GMT", "version": "v1" } ]
2014-02-26
[ [ "Muller", "Melanie JI", "" ], [ "Neugeboren", "Beverly I", "" ], [ "Nelson", "David R", "" ], [ "Murray", "Andrew W", "" ] ]
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1402.5987
Daniel S. Berger
Daniel S. Berger, Philipp Gland, Sahil Singla, and Florin Ciucu
Exact Analysis of TTL Cache Networks: The Case of Caching Policies driven by Stopping Times
null
null
null
null
cs.PF cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
TTL caching models have recently regained significant research interest, largely due to their ability to fit popular caching policies such as LRU. This paper advances the state-of-the-art analysis of TTL-based cache networks by developing two exact methods with orthogonal generality and computational complexity. The first method generalizes existing results for line networks under renewal requests to the broad class of caching policies whereby evictions are driven by stopping times. The obtained results are further generalized, using the second method, to feedforward networks with Markov arrival processes (MAP) requests. MAPs are particularly suitable for non-line networks because they are closed not only under superposition and splitting, as known, but also under input-output caching operations as proven herein for phase-type TTL distributions. The crucial benefit of the two closure properties is that they jointly enable the first exact analysis of feedforward networks of TTL caches in great generality.
[ { "created": "Mon, 24 Feb 2014 21:19:39 GMT", "version": "v1" } ]
2014-02-26
[ [ "Berger", "Daniel S.", "" ], [ "Gland", "Philipp", "" ], [ "Singla", "Sahil", "" ], [ "Ciucu", "Florin", "" ] ]
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1402.5988
Nikos Katzouris
Nikos Katzouris, Alexander Artikis, George Paliouras
Incremental Learning of Event Definitions with Inductive Logic Programming
null
null
null
null
cs.LG cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Event recognition systems rely on properly engineered knowledge bases of event definitions to infer occurrences of events in time. The manual development of such knowledge is a tedious and error-prone task, thus event-based applications may benefit from automated knowledge construction techniques, such as Inductive Logic Programming (ILP), which combines machine learning with the declarative and formal semantics of First-Order Logic. However, learning temporal logical formalisms, which are typically utilized by logic-based Event Recognition systems is a challenging task, which most ILP systems cannot fully undertake. In addition, event-based data is usually massive and collected at different times and under various circumstances. Ideally, systems that learn from temporal data should be able to operate in an incremental mode, that is, revise prior constructed knowledge in the face of new evidence. Most ILP systems are batch learners, in the sense that in order to account for new evidence they have no alternative but to forget past knowledge and learn from scratch. Given the increased inherent complexity of ILP and the volumes of real-life temporal data, this results to algorithms that scale poorly. In this work we present an incremental method for learning and revising event-based knowledge, in the form of Event Calculus programs. The proposed algorithm relies on abductive-inductive learning and comprises a scalable clause refinement methodology, based on a compressive summarization of clause coverage in a stream of examples. We present an empirical evaluation of our approach on real and synthetic data from activity recognition and city transport applications.
[ { "created": "Mon, 24 Feb 2014 21:22:51 GMT", "version": "v1" }, { "created": "Sat, 22 Nov 2014 13:24:29 GMT", "version": "v2" } ]
2014-11-25
[ [ "Katzouris", "Nikos", "" ], [ "Artikis", "Alexander", "" ], [ "Paliouras", "George", "" ] ]
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Incremental Learning of Event Definitions with Inductive Logic Programming
http://arxiv.org/abs/1402.5988v2
http://arxiv.org/pdf/1402.5988v2.pdf
https://github.com/nkatzz/iled
false
false
https://paperswithcode.com/paper/incremental-learning-of-event-definitions
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1402.5991
Issac Shams
Issac Shams, Saeede Ajorlou, Kai Yang
A predictive analytics approach to reducing avoidable hospital readmission
30 pages, 4 figures, 7 tables
null
null
null
stat.AP cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Hospital readmission has become a critical metric of quality and cost of healthcare. Medicare anticipates that nearly $17 billion is paid out on the 20% of patients who are readmitted within 30 days of discharge. Although several interventions such as transition care management and discharge reengineering have been practiced in recent years, the effectiveness and sustainability depends on how well they can identify and target patients at high risk of rehospitalization. Based on the literature, most current risk prediction models fail to reach an acceptable accuracy level; none of them considers patient's history of readmission and impacts of patient attribute changes over time; and they often do not discriminate between planned and unnecessary readmissions. Tackling such drawbacks, we develop a new readmission metric based on administrative data that can identify potentially avoidable readmissions from all other types of readmission. We further propose a tree based classification method to estimate the predicted probability of readmission that can directly incorporate patient's history of readmission and risk factors changes over time. The proposed methods are validated with 2011-12 Veterans Health Administration data from inpatients hospitalized for heart failure, acute myocardial infarction, pneumonia, or chronic obstructive pulmonary disease in the State of Michigan. Results shows improved discrimination power compared to the literature (c-statistics>80%) and good calibration.
[ { "created": "Mon, 24 Feb 2014 21:37:25 GMT", "version": "v1" }, { "created": "Wed, 12 Mar 2014 23:42:51 GMT", "version": "v2" } ]
2014-03-14
[ [ "Shams", "Issac", "" ], [ "Ajorlou", "Saeede", "" ], [ "Yang", "Kai", "" ] ]
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1402.5992
R\u{a}zvan \c{S}tef\u{a}nescu
R\u{a}zvan \c{S}tef\u{a}nescu, Adrian Sandu, Ionel Michael Navon
POD/DEIM Reduced-Order Strategies for Efficient Four Dimensional Variational Data Assimilation
49 pages, 7 figures
null
10.1016/j.jcp.2015.04.030
CSTR-17/2015
cs.SY math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work studies reduced order modeling (ROM) approaches to speed up the solution of variational data assimilation problems with large scale nonlinear dynamical models. It is shown that a key requirement for a successful reduced order solution is that reduced order Karush-Kuhn-Tucker conditions accurately represent their full order counterparts. In particular, accurate reduced order approximations are needed for the forward and adjoint dynamical models, as well as for the reduced gradient. New strategies to construct reduced order based are developed for Proper Orthogonal Decomposition (POD) ROM data assimilation using both Galerkin and Petrov-Galerkin projections. For the first time POD, tensorial POD, and discrete empirical interpolation method (DEIM) are employed to develop reduced data assimilation systems for a geophysical flow model, namely, the two dimensional shallow water equations. Numerical experiments confirm the theoretical framework for Galerkin projection. In the case of Petrov-Galerkin projection, stabilization strategies must be considered for the reduced order models. The new reduced order shallow water data assimilation system provides analyses similar to those produced by the full resolution data assimilation system in one tenth of the computational time.
[ { "created": "Mon, 24 Feb 2014 21:39:33 GMT", "version": "v1" }, { "created": "Thu, 20 Mar 2014 05:37:26 GMT", "version": "v2" }, { "created": "Thu, 23 Apr 2015 04:00:44 GMT", "version": "v3" } ]
2015-05-20
[ [ "Ştefănescu", "Răzvan", "" ], [ "Sandu", "Adrian", "" ], [ "Navon", "Ionel Michael", "" ] ]
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1402.5994
Thomas Bernhard R\"ocker
T.B. R\"ocker, L. Cou\"edel, S.K. Zhdanov, V. Nosenko, A.V. Ivlev, H.M. Thomas, and G.E. Morfill
Nonlinear regime of the mode-coupling instability in 2D plasma crystals
6 pages, 4 figures
null
10.1209/0295-5075/106/45001
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The transition between linear and nonlinear regimes of the mode-coupling instability (MCI) operating in a monolayer plasma crystal is studied. The mode coupling is triggered at the centre of the crystal and a melting front is formed, which travels through the crystal. At the nonlinear stage, the mode coupling results in synchronisation of the particle motion and the kinetic temperature of the particles grows exponentially. After melting of the crystalline structure, the mean kinetic energy of the particles continued to grow further, preventing recrystallisation of the melted phase. The effect could not be reproduced in simulations employing a simple point-like wake model. This shows that at the nonlinear stage of the MCI a heating mechanism is working which was not considered so far.
[ { "created": "Mon, 24 Feb 2014 21:46:29 GMT", "version": "v1" } ]
2015-06-18
[ [ "Röcker", "T. B.", "" ], [ "Couëdel", "L.", "" ], [ "Zhdanov", "S. K.", "" ], [ "Nosenko", "V.", "" ], [ "Ivlev", "A. V.", "" ], [ "Thomas", "H. M.", "" ], [ "Morfill", "G. E.", "" ] ]
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1402.5999
She-Sheng Xue
Rohoollah Mohammadi, Iman Motie, She-Sheng Xue
Circular polarization from linearly polarized laser beam collisions
11 pages 1 figure
Physics Review A89 062111(2014)
10.1103/PhysRevA.89.062111
null
physics.optics hep-ex hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
To probe the nonlinear effects of photon-photon interaction in the quantum electrodynamics, we study the generation of circular polarized photons by the collision of two linearly polarized laser beams. In the framework of the Euler-Heisenberg effective Lagrangian and the Quantum Boltzmann equation for the time evolution of the density matrix of polarizations, we calculate the intensity of circular polarizations generated by the collision of two linearly polarized laser beams and estimate the rate of generation. As a result, we show that the generated circular polarization can be experimentally measured, on the basis of optical laser beams of average power KW, which are currently available in laboratories. Our study presents a valuable supplementary to other theoretical and experimental frameworks to study and measure the nonlinear effects of photon-photon interaction in the quantum electrodynamics.
[ { "created": "Fri, 21 Feb 2014 17:34:13 GMT", "version": "v1" } ]
2015-09-09
[ [ "Mohammadi", "Rohoollah", "" ], [ "Motie", "Iman", "" ], [ "Xue", "She-Sheng", "" ] ]
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1402.6005
Alexander L\'opez-Parrado Mr.
Juan Camilo Valderrama-Cuervo, Alexander L\'opez-Parrado
Open Cores for Digital Signal Processing
null
null
null
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents the design and implementation of three System on Chip (SoC) cores, which implement the Digital Signal Processing (DSP) functions: Finite Impulse Response (FIR) filter, Infinite Impulse Response (IIR) filter and Fast Fourier Transform (FFT). The FIR filter core is based on the symmetrical realization form, the IIR filter core is based on the Second Order Sections (SOS) architecture and the FFT core is based on the Radix $2^2$ Single Delay Feedback (R$2^2$SDF) architecture. The three cores are compatible with the Wishbone SoC bus and they were described using generic and structural VHDL. In system hardware verification was performed by using an OpenRisc-based SoC synthesized on an Altera FPGA, the tests showed that the designed DSP cores are suitable for building SoC based on the OpenRisc processor and the Wishbone bus.
[ { "created": "Mon, 24 Feb 2014 22:42:02 GMT", "version": "v1" } ]
2014-02-26
[ [ "Valderrama-Cuervo", "Juan Camilo", "" ], [ "López-Parrado", "Alexander", "" ] ]
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1402.6010
Linhong Zhu
Linhong Zhu and Aram Galstyan and James Cheng and Kristina Lerman
Tripartite Graph Clustering for Dynamic Sentiment Analysis on Social Media
A short version is in Proceeding of the 2014 ACM SIGMOD International Conference on Management of data
null
10.1145/2588555.2593682
null
cs.SI cs.CL cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The growing popularity of social media (e.g, Twitter) allows users to easily share information with each other and influence others by expressing their own sentiments on various subjects. In this work, we propose an unsupervised \emph{tri-clustering} framework, which analyzes both user-level and tweet-level sentiments through co-clustering of a tripartite graph. A compelling feature of the proposed framework is that the quality of sentiment clustering of tweets, users, and features can be mutually improved by joint clustering. We further investigate the evolution of user-level sentiments and latent feature vectors in an online framework and devise an efficient online algorithm to sequentially update the clustering of tweets, users and features with newly arrived data. The online framework not only provides better quality of both dynamic user-level and tweet-level sentiment analysis, but also improves the computational and storage efficiency. We verified the effectiveness and efficiency of the proposed approaches on the November 2012 California ballot Twitter data.
[ { "created": "Mon, 24 Feb 2014 22:58:28 GMT", "version": "v1" }, { "created": "Wed, 26 Feb 2014 18:50:55 GMT", "version": "v2" }, { "created": "Thu, 12 Jun 2014 18:49:21 GMT", "version": "v3" } ]
2014-06-13
[ [ "Zhu", "Linhong", "" ], [ "Galstyan", "Aram", "" ], [ "Cheng", "James", "" ], [ "Lerman", "Kristina", "" ] ]
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1402.6013
Joaquin Vanschoren
Joaquin Vanschoren and Mikio L. Braun and Cheng Soon Ong
Open science in machine learning
null
null
null
null
cs.LG cs.DL
http://creativecommons.org/licenses/by/3.0/
We present OpenML and mldata, open science platforms that provides easy access to machine learning data, software and results to encourage further study and application. They go beyond the more traditional repositories for data sets and software packages in that they allow researchers to also easily share the results they obtained in experiments and to compare their solutions with those of others.
[ { "created": "Mon, 24 Feb 2014 23:12:42 GMT", "version": "v1" } ]
2014-02-26
[ [ "Vanschoren", "Joaquin", "" ], [ "Braun", "Mikio L.", "" ], [ "Ong", "Cheng Soon", "" ] ]
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1402.6016
Suayb Arslan
Suayb S. Arslan
Incremental Redundancy, Fountain Codes and Advanced Topics
57 pages, 22 figures, Version 0.2
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null
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This document is written in order to establish a common base ground on which the majority of the relevant research about linear fountain codes can be analyzed and compared. As far as I am concerned, there is no unified approach that outlines and compares most of the published linear fountain codes in a single and self-contained framework. This written document has not only resulted in the review of theoretical fundamentals of efficient coding techniques for incremental redundancy and linear fountain coding, but also helped me have a comprehensive reference document and hopefully for many other graduate students who would like to have some background to pursue a research career regarding fountain codes and their various applications. Some background in information, coding, graph and probability theory is expected. Although various aspects of this topic and many other relevant research are deliberately left out, I still hope that this document shall serve researchers' need well. I have also included several exercises to warm up. The presentation style is usually informal and the presented material is not necessarily rigorous. There are many spots in the text that are product of my coauthors and myself, although some of which have not been published yet.
[ { "created": "Mon, 24 Feb 2014 23:41:50 GMT", "version": "v1" }, { "created": "Mon, 14 Jul 2014 22:40:31 GMT", "version": "v2" } ]
2014-07-16
[ [ "Arslan", "Suayb S.", "" ] ]
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Incremental Redundancy, Fountain Codes and Advanced Topics
https://arxiv.org/abs/1402.6016v2
https://arxiv.org/pdf/1402.6016v2.pdf
https://github.com/suaybarslan/founsure.github.io
false
false
https://paperswithcode.com/paper/incremental-redundancy-fountain-codes-and
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1402.6024
Victor Krylov
Victor V. Krylov
Directivity patterns of laser-generated sound in solids: Effects of optical and thermal parameters
14 pages, 7 figures
Ultrasonics, vol. 69, July 2016, pp. 279-284
10.1016/j.ultras.2016.01.011
null
physics.optics physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the present paper, directivity patterns of laser-generated sound in solids are investigated theoretically. Two main approaches to the calculation of directivity patterns of laser-generated sound are discussed for the most important case of thermo-optical regime of generation. The first approach, which is widely used in practice, is based on the simple modelling of the equivalent thermo-optical source as a mechanical dipole comprising two horizontal forces applied to the surface in opposite directions. The second approach is based on the rigorous theory that takes into account all acoustical, optical and thermal parameters of a solid material and all geometrical and physical parameters of a laser beam. Directivity patterns of laser-generated bulk longitudinal and shear elastic waves, as well as the amplitudes of generated Rayleigh surface waves, are calculated for different values of physical and geometrical parameters and compared with the directivity patterns calculated in case of dipole-source representation. It is demonstrated that the simple approach using a dipole-source representation of laser-generated sound is rather limited, especially for description of generated longitudinal acoustic waves. A practical criterion is established to define the conditions under which the dipole-source representation gives predictions with acceptable errors. It is shown that, for radiation in the normal direction to the surface, the amplitudes of longitudinal waves are especially sensitive to the values of thermal parameters and of the acoustic reflection coefficient from a free solid surface. A discussion is given on the possibility of using such a high sensitivity to the values of the reflection coefficient for investigation of surface properties of real solids.
[ { "created": "Tue, 25 Feb 2014 00:34:20 GMT", "version": "v1" } ]
2017-08-22
[ [ "Krylov", "Victor V.", "" ] ]
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1402.6028
Volodymyr Kuleshov
Volodymyr Kuleshov and Doina Precup
Algorithms for multi-armed bandit problems
null
null
null
null
cs.AI cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Although many algorithms for the multi-armed bandit problem are well-understood theoretically, empirical confirmation of their effectiveness is generally scarce. This paper presents a thorough empirical study of the most popular multi-armed bandit algorithms. Three important observations can be made from our results. Firstly, simple heuristics such as epsilon-greedy and Boltzmann exploration outperform theoretically sound algorithms on most settings by a significant margin. Secondly, the performance of most algorithms varies dramatically with the parameters of the bandit problem. Our study identifies for each algorithm the settings where it performs well, and the settings where it performs poorly. Thirdly, the algorithms' performance relative each to other is affected only by the number of bandit arms and the variance of the rewards. This finding may guide the design of subsequent empirical evaluations. In the second part of the paper, we turn our attention to an important area of application of bandit algorithms: clinical trials. Although the design of clinical trials has been one of the principal practical problems motivating research on multi-armed bandits, bandit algorithms have never been evaluated as potential treatment allocation strategies. Using data from a real study, we simulate the outcome that a 2001-2002 clinical trial would have had if bandit algorithms had been used to allocate patients to treatments. We find that an adaptive trial would have successfully treated at least 50% more patients, while significantly reducing the number of adverse effects and increasing patient retention. At the end of the trial, the best treatment could have still been identified with a high level of statistical confidence. Our findings demonstrate that bandit algorithms are attractive alternatives to current adaptive treatment allocation strategies.
[ { "created": "Tue, 25 Feb 2014 01:34:43 GMT", "version": "v1" } ]
2014-02-26
[ [ "Kuleshov", "Volodymyr", "" ], [ "Precup", "Doina", "" ] ]
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