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1402.2195
Georg Epple
G. Epple, K. S. Kleinbach, T. G. Euser, N. Y. Joly, T. Pfau, P. St.J. Russell, and R. L\"ow
Rydberg atoms in hollow-core photonic crystal fibres
null
null
10.1038/ncomms5132
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The exceptionally large polarisability of highly excited Rydberg atoms (six orders of magnitude higher than ground-state atoms) makes them of great interest in fields such as quantum optics, quantum computing, quantum simulation and metrology. If however they are to be used routinely in applications, a major requirement is their integration into technically feasible, miniaturised devices. Here we show that a Rydberg medium based on room temperature caesium vapour can be confined in broadband-guiding kagome-style hollow-core photonic crystal fibres. Three-photon spectroscopy performed on a caesium-filled fibre detects Rydberg states up to a principal quantum number of n = 40. Besides small energy level shifts we observe narrow lines confirming the coherence of the Rydberg excitation. Using different Rydberg states and core diameters we study the influence of confinement within the fibre core after different exposure times. Understanding these effects is essential for the successful future development of novel applications based on integrated room temperature Rydberg systems.
[ { "created": "Mon, 10 Feb 2014 16:09:11 GMT", "version": "v1" } ]
2015-06-18
[ [ "Epple", "G.", "" ], [ "Kleinbach", "K. S.", "" ], [ "Euser", "T. G.", "" ], [ "Joly", "N. Y.", "" ], [ "Pfau", "T.", "" ], [ "Russell", "P. St. J.", "" ], [ "Löw", "R.", "" ] ]
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1402.2197
Michele Sclafani
M. Sclafani, M. Marksteiner, F. McLennar Keir, A. Divochiy, A. Korneev, A. Semenov, G. Goltsmann and M. Arndt
Sensitivity of a superconducting nanowire detector for single ions at low energy
5 pages, 4 figures
Nanotechnology 23, 065501,(2012)
10.1088/0957-4484/23/6/065501
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on the characterization of a superconducting nanowire detector for ions at low kinetic energies. We measure the absolute single particle detection efficiency $\eta$ and trace its increase with energy up to $\eta = 100$ %. We discuss the influence of noble gas adsorbates on the cryogenic surface and analyze their relevance for the detection of slow massive particles. We apply a recent model for the hot spot formation to the incidence of atomic ions at energies between 0.2-1 keV. We suggest how the differences observed for photons and atoms or molecules can be related to the surface condition of the detector and we propose that the restoration of proper surface conditions may open a new avenue to SSPD-based optical spectroscopy on molecules and nanoparticles.
[ { "created": "Mon, 10 Feb 2014 16:15:45 GMT", "version": "v1" } ]
2014-02-11
[ [ "Sclafani", "M.", "" ], [ "Marksteiner", "M.", "" ], [ "Keir", "F. McLennar", "" ], [ "Divochiy", "A.", "" ], [ "Korneev", "A.", "" ], [ "Semenov", "A.", "" ], [ "Goltsmann", "G.", "" ], [ "Arndt", "M.", "" ] ]
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1402.2204
Saibharath S
S. Saibharath and J. Aarthi
Virtual Backbone Trees for Most Minimal Energy Consumption and Increasing Network Lifetime In WSNs
10 pages, 4 figures, International Journal of Computer Networks & Communications (IJCNC) Vol.6, No.1, January 2014
International Journal of Computer Networks & Communications (IJCNC) Vol.6, No.1, January 2014
null
null
cs.NI
http://creativecommons.org/licenses/by-nc-sa/3.0/
Virtual backbone trees have been used for efficient communication between sink node and any other node in the deployed area. But all the proposed virtual backbone trees are not fully energy efficient and EVBTs have few flaws associated with them. In this paper two such virtual backbones are proposed. The motive behind the first algorithm, Most Minimal Energy Virtual Backbone Tree (MMEVBT), is to minimise the energy consumption when packets are transmitted between sink and a target sensor node. The energy consumption is most minimal and optimal and it is shown why it always has minimal energy consumption during any transfer of packet between every node with the sink node. For every node, route path with most minimal energy consumption is identified and a new tree node is elected only when a better minimal energy consumption route is identified for a node to communicate with the sink and vice versa. By moving sink periodically it is ensured the battery of the nodes near sink is not completely drained out. Another backbone construction algorithm is proposed which maximises the network lifetime by increasing the lifetime of all tree nodes. Simulations are done in NS2 to practically test the algorithms and the results are discussed in detail.
[ { "created": "Mon, 10 Feb 2014 16:43:00 GMT", "version": "v1" } ]
2014-02-11
[ [ "Saibharath", "S.", "" ], [ "Aarthi", "J.", "" ] ]
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1402.2206
Nyagudi Musandu Nyagudi
Nyagudi Musandu Nyagudi
Humanitarian Algorithms : A Codified Key Safety Switch Protocol for Lethal Autonomy
14 pages, 11 references and 1 diagram
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With the deployment of lethal autonomous weapons, there is the requirement that any such platform complies with the precepts of International Humanitarian Law. Humanitarian Algorithms[9: p. 9] ensure that lethal autonomous weapon systems perform military/security operations, within the confines of International Humanitarian Law. Unlike other existing techniques of regulating lethal autonomy this scheme advocates for an approach that enables Machine Learning. Lethal autonomous weapons must be equipped with appropriate fail-safe mechanisms that locks them if they malfunction.
[ { "created": "Mon, 10 Feb 2014 16:45:01 GMT", "version": "v1" } ]
2014-02-11
[ [ "Nyagudi", "Nyagudi Musandu", "" ] ]
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1402.2213
Johanna Fuks
Johanna I. Fuks and Neepa T. Maitra
Challenging Adiabatic Time-dependent Density Functional Theory with a Hubbard Dimer: The Case of Time-Resolved Long-Range Charge Transfer
6 figures
null
10.1039/C4CP00118D
null
physics.chem-ph cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We explore an asymmetric two-fermion Hubbard dimer to test the accuracy of the adiabatic approximation of time-dependent density functional theory in modelling time-resolved charge transfer. We show that the model shares essential features of a ground state long-range molecule in real-space, and by applying a resonant field we show that the model also reproduces essential traits of the CT dynamics. The simplicity of the model allows us to propagate with an "adiabatically-exact" approximation, i.e. one that uses the exact ground-state exchange-correlation functional, and compare with the exact propagation. This allows us to study the impact of the time-dependent charge-transfer step feature in the exact correlation potential of real molecules on the resulting dynamics. Tuning the parameters of the dimer allows a study both of charge-transfer between open-shell fragments and between closed-shell fragments. We find that the adiabatically-exact functional is unable to properly transfer charge, even in situations where the adiabatically-exact resonance frequency is remarkably close to the exact resonance, and we analyze why.
[ { "created": "Mon, 10 Feb 2014 17:10:57 GMT", "version": "v1" } ]
2014-05-13
[ [ "Fuks", "Johanna I.", "" ], [ "Maitra", "Neepa T.", "" ] ]
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1402.2217
Nirbhay Chaubey Kumar
Akshai Aggarwal, Savita Gandhi, Nirbhay Chaubey
Performance Analysis of AODV, DSDV and DSR in MANETs
11 Pages, 8 Figure and 2 Tables
null
10.5121/ijdps.2011.2615
null
cs.NI cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mobile Ad hoc Networks (MANETs) are considered as a new paradigm of infrastructure-less mobile wireless communication systems. MANETs are being widely studied and it is the technology that is attracting a large variety of applications. Routing in MANETs is considered a challenging task due to the unpredictable changes in the network topology, resulting from the random and frequent movement of the nodes and due to the absence of any centralized control [1][2]. In this paper, we evaluate the performance of reactive routing protocols, Ad hoc On demand Distance Vector (AODV) and Dynamic Source Routing (DSR) and proactive routing protocol Destination Sequenced Distance Vector (DSDV). The major goal of this study is to analyze the performance of well known MANETs routing protocol in high mobility case under low, medium and high density scenario. Unlike military applications, most of the other applications of MANETs require moderate to high mobility. Hence it becomes important to study the impact of high mobility on the performance of these routing protocols. The performance is analyzed with respect to Average End-to-End Delay, Normalized Routing Load (NRL), Packet Delivery Fraction (PDF) and Throughput. Simulation results verify that AODV gives better performance as compared to DSR and DSDV.
[ { "created": "Mon, 10 Feb 2014 17:20:35 GMT", "version": "v1" } ]
2014-02-11
[ [ "Aggarwal", "Akshai", "" ], [ "Gandhi", "Savita", "" ], [ "Chaubey", "Nirbhay", "" ] ]
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1402.2224
Uri Stemmer
Amos Beimel, Kobbi Nissim, Uri Stemmer
Characterizing the Sample Complexity of Private Learners
null
null
null
null
cs.CR cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In 2008, Kasiviswanathan et al. defined private learning as a combination of PAC learning and differential privacy. Informally, a private learner is applied to a collection of labeled individual information and outputs a hypothesis while preserving the privacy of each individual. Kasiviswanathan et al. gave a generic construction of private learners for (finite) concept classes, with sample complexity logarithmic in the size of the concept class. This sample complexity is higher than what is needed for non-private learners, hence leaving open the possibility that the sample complexity of private learning may be sometimes significantly higher than that of non-private learning. We give a combinatorial characterization of the sample size sufficient and necessary to privately learn a class of concepts. This characterization is analogous to the well known characterization of the sample complexity of non-private learning in terms of the VC dimension of the concept class. We introduce the notion of probabilistic representation of a concept class, and our new complexity measure RepDim corresponds to the size of the smallest probabilistic representation of the concept class. We show that any private learning algorithm for a concept class C with sample complexity m implies RepDim(C)=O(m), and that there exists a private learning algorithm with sample complexity m=O(RepDim(C)). We further demonstrate that a similar characterization holds for the database size needed for privately computing a large class of optimization problems and also for the well studied problem of private data release.
[ { "created": "Mon, 10 Feb 2014 17:45:00 GMT", "version": "v1" } ]
2014-02-12
[ [ "Beimel", "Amos", "" ], [ "Nissim", "Kobbi", "" ], [ "Stemmer", "Uri", "" ] ]
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1402.2228
Wolfgang John
Wolfgang John, Alisa Devlic, Zhemin Ding, David Jocha, Andras Kern, Mario Kind, Andreas K\"opsel, Viktor Nordell, Sachin Sharma, Pontus Sk\"oldstr\"om, Dimitri Staessens, Attila Takacs, Steffen Topp, F.-Joachim Westphal, Hagen Woesner and Andreas Gladisch
Split Architecture for Large Scale Wide Area Networks
This is the public deliverable D3.3 of the EU FP7 SPARC project (ICT-258457) - "Split Architecture for Carrier Grade Networks". Original Deliverable published at http://www.fp7-sparc.eu/
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This report defines a carrier-grade split architecture based on requirements identified during the SPARC project. It presents the SplitArchitecture proposal, the SPARC concept for Software Defined Networking (SDN) introduced for large-scale wide area networks such as access/aggregation networks, and evaluates technical issues against architectural trade-offs. First we present the control and management architecture of the proposed SplitArchitecture. Here, we discuss a recursive control architecture consisting of hierarchically stacked control planes and provide initial considerations regarding network management integration to SDN in general and SplitArchitecture in particular. Next, OpenFlow extensions to support the carrier-grade SplitArchitecture are discussed. These are: a) Openness & Extensibility; b) Virtualization; c) OAM; d) Resiliency approaches; e) Bootstrapping and topology discovery; f) Service creation; g) Energy-efficient networking; h) QoS aspects; and i) Multilayer aspects. In addition, we discuss selected deployment and adoption scenarios faced by modern operator networks, such as service creation scenarios and peering aspects, i.e., how to interconnect with legacy networks. Finally, we indicate how our SplitArchitecture approach meets carrier grade scalability requirements in access/aggregation network scenarios
[ { "created": "Thu, 6 Feb 2014 15:26:51 GMT", "version": "v1" } ]
2014-02-11
[ [ "John", "Wolfgang", "" ], [ "Devlic", "Alisa", "" ], [ "Ding", "Zhemin", "" ], [ "Jocha", "David", "" ], [ "Kern", "Andras", "" ], [ "Kind", "Mario", "" ], [ "Köpsel", "Andreas", "" ], [ "Nordell", "Viktor", "" ], [ "Sharma", "Sachin", "" ], [ "Sköldström", "Pontus", "" ], [ "Staessens", "Dimitri", "" ], [ "Takacs", "Attila", "" ], [ "Topp", "Steffen", "" ], [ "Westphal", "F. -Joachim", "" ], [ "Woesner", "Hagen", "" ], [ "Gladisch", "Andreas", "" ] ]
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1402.2230
Nikhita Tripathi Ms.
Nikhita Tripathi, Nikhil Saxena, Sonal Soni
Design of an Amplifier through Second Generation Current Conveyor
6 pages
null
null
null
cs.ET
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper describes the architecture of first and second generation current conveyor (CCI and CCII respectively) and designing an amplifier using second generation current conveyor. The designed amplifier through CCII+ can be used in various analog computation circuits and is superior in performance than the classical opamp. It provides better gain with higher accuracy.
[ { "created": "Mon, 10 Feb 2014 18:21:26 GMT", "version": "v1" } ]
2014-02-11
[ [ "Tripathi", "Nikhita", "" ], [ "Saxena", "Nikhil", "" ], [ "Soni", "Sonal", "" ] ]
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1402.2231
William Bradley
J. N. Laska, W. F. Bradley, T. W. Rondeau, K. E. Nolan, and B. Vigoda
Compressive sensing for dynamic spectrum access networks: Techniques and tradeoffs
2011 IEEE Symposium on New Frontiers in Dynamic Spectrum, May 2011
null
10.1109/DYSPAN.2011.5936202
null
cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We explore the practical costs and benefits of CS for dynamic spectrum access (DSA) networks. Firstly, we review several fast and practical techniques for energy detection without full reconstruction and provide theoretical guarantees. We also define practical metrics to measure the performance of these techniques. Secondly, we perform comprehensive experiments comparing the techniques on real signals captured over the air. Our results show that we can significantly compressively acquire the signal while still accurately determining spectral occupancy.
[ { "created": "Mon, 10 Feb 2014 18:27:53 GMT", "version": "v1" } ]
2016-11-18
[ [ "Laska", "J. N.", "" ], [ "Bradley", "W. F.", "" ], [ "Rondeau", "T. W.", "" ], [ "Nolan", "K. E.", "" ], [ "Vigoda", "B.", "" ] ]
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1402.2232
Vipeen Bopche Vikas
V Rajakumar, Vipeen V Bopche
Image Search Reranking
null
International Journal of Computer Trends and Technology (IJCTT) 6(41):5-6, December 2013
null
null
cs.IR cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The existing methods for image search reranking suffer from the unfaithfulness of the assumptions under which the text-based images search result. The resulting images contain more irrelevant images. Hence the re ranking concept arises to re rank the retrieved images based on the text around the image and data of data of image and visual feature of image. A number of methods are differentiated for this re-ranking. The high ranked images are used as noisy data and a k means algorithm for classification is learned to rectify the ranking further. We are study the affect ability of the cross validation method to this training data. The pre eminent originality of the overall method is in collecting text/metadata of image and visual features in order to achieve an automatic ranking of the images. Supervision is initiated to learn the model weights offline, previous to reranking process. While model learning needs manual labeling of the results for a some limited queries, the resulting model is query autonomous and therefore applicable to any other query .Examples are given for a selection of other classes like vehicles, animals and other classes.
[ { "created": "Mon, 10 Feb 2014 18:28:18 GMT", "version": "v1" } ]
2014-02-11
[ [ "Rajakumar", "V", "" ], [ "Bopche", "Vipeen V", "" ] ]
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1402.2237
Peter Bailis
Peter Bailis, Alan Fekete, Michael J. Franklin, Ali Ghodsi, Joseph M. Hellerstein, Ion Stoica
Coordination Avoidance in Database Systems (Extended Version)
Extended version of paper appearing in PVLDB Vol. 8, No. 3
null
null
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Minimizing coordination, or blocking communication between concurrently executing operations, is key to maximizing scalability, availability, and high performance in database systems. However, uninhibited coordination-free execution can compromise application correctness, or consistency. When is coordination necessary for correctness? The classic use of serializable transactions is sufficient to maintain correctness but is not necessary for all applications, sacrificing potential scalability. In this paper, we develop a formal framework, invariant confluence, that determines whether an application requires coordination for correct execution. By operating on application-level invariants over database states (e.g., integrity constraints), invariant confluence analysis provides a necessary and sufficient condition for safe, coordination-free execution. When programmers specify their application invariants, this analysis allows databases to coordinate only when anomalies that might violate invariants are possible. We analyze the invariant confluence of common invariants and operations from real-world database systems (i.e., integrity constraints) and applications and show that many are invariant confluent and therefore achievable without coordination. We apply these results to a proof-of-concept coordination-avoiding database prototype and demonstrate sizable performance gains compared to serializable execution, notably a 25-fold improvement over prior TPC-C New-Order performance on a 200 server cluster.
[ { "created": "Mon, 10 Feb 2014 19:01:33 GMT", "version": "v1" }, { "created": "Tue, 11 Feb 2014 10:50:06 GMT", "version": "v2" }, { "created": "Fri, 4 Apr 2014 19:07:20 GMT", "version": "v3" }, { "created": "Thu, 30 Oct 2014 06:15:25 GMT", "version": "v4" } ]
2014-10-31
[ [ "Bailis", "Peter", "" ], [ "Fekete", "Alan", "" ], [ "Franklin", "Michael J.", "" ], [ "Ghodsi", "Ali", "" ], [ "Hellerstein", "Joseph M.", "" ], [ "Stoica", "Ion", "" ] ]
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1402.2238
Yash Deshpande
Yash Deshpande, Andrea Montanari
Information-theoretically Optimal Sparse PCA
5 pages, 1 figure, conference
null
null
null
cs.IT math.IT math.ST stat.TH
http://creativecommons.org/licenses/by-nc-sa/3.0/
Sparse Principal Component Analysis (PCA) is a dimensionality reduction technique wherein one seeks a low-rank representation of a data matrix with additional sparsity constraints on the obtained representation. We consider two probabilistic formulations of sparse PCA: a spiked Wigner and spiked Wishart (or spiked covariance) model. We analyze an Approximate Message Passing (AMP) algorithm to estimate the underlying signal and show, in the high dimensional limit, that the AMP estimates are information-theoretically optimal. As an immediate corollary, our results demonstrate that the posterior expectation of the underlying signal, which is often intractable to compute, can be obtained using a polynomial-time scheme. Our results also effectively provide a single-letter characterization of the sparse PCA problem.
[ { "created": "Mon, 10 Feb 2014 19:10:37 GMT", "version": "v1" }, { "created": "Sat, 3 May 2014 22:14:10 GMT", "version": "v2" } ]
2014-05-06
[ [ "Deshpande", "Yash", "" ], [ "Montanari", "Andrea", "" ] ]
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Information-theoretically Optimal Sparse PCA
https://arxiv.org/abs/1402.2238v2
https://arxiv.org/pdf/1402.2238v2.pdf
https://github.com/krzakala/LowRAMP
false
false
https://paperswithcode.com/paper/information-theoretically-optimal-sparse-pca
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1402.2240
Oleg Moroz
O. Moroz
Analytical formulas for shear and bulk viscosities in relativistic gaseous mixtures with constant cross sections
32 pages; the version accepted to Computers & Fluids. arXiv admin note: substantial text overlap with arXiv:1301.6670, arXiv:1112.0277
Comput. Fluids 90, 9 (2014)
10.1016/j.compfluid.2013.11.014
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using Mathematica package, we derive analytical closed-form expressions for the shear and the bulk viscosity coefficients in multicomponent relativistic gases with constant cross sections, being the relativistic generalization for the hard spheres model. Some of them are cumbersome and require symbolic manipulations in an algebraic package. The constant cross sections are of the elastic processes, while the inelastic (or number-changing) processes (collisions or decays) are considered only partly. As examples, we find explicit expressions of the correct single-component first-order shear viscosity coefficient and some explicit analytical results for the binary mixture. These formulas have numerous applications in approximate nonequilibrium descriptions of gases of particles or quasiparticles with averaged (temperature dependent) cross sections. In addition to this, we present formulas for collision rates and some other related formulas. This paper is a shortened version of a previous one.
[ { "created": "Mon, 10 Feb 2014 19:13:42 GMT", "version": "v1" } ]
2014-02-11
[ [ "Moroz", "O.", "" ] ]
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1402.2241
Fedor Danevich
F.A. Danevich, R.V. Kobychev, V.V. Kobychev, H. Kraus, V.B. Mikhailik, V.M. Mokina
Optimization of light collection from crystal scintillators for cryogenic experiments
12 pages, 8 figures, 1 Table
null
10.1016/j.nima.2014.01.042
null
physics.ins-det nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
High light collection efficiency is an important requirement in any application of scintillation detectors. The purpose of this study is to investigate the possibility for improving this parameter in cryogenic scintillation bolometers, which can be considered as a promising detectors in experiments investigating neutrinoless double beta decay and dark matter. Energy resolutions and relative pulse amplitudes of scintillation detectors using ZnWO4 scintillation crystals of different shapes (cylinder 20 mm in dimater by 20 mm and hexagonal prism with diagonal 20 mm and height 20 mm), reflector materials and shapes, optical contact and surface properties (polished and diffused) were measured at room temperature. Propagation of optical photons in these experimental conditions was simulated using Geant4 and ZEMAX codes. The results of the simulations are found to be in good agreement with each other and with direct measurements of the crystals. This could be applied to optimize the geometry of scintillation detectors used in the cryogenic experiments.
[ { "created": "Mon, 10 Feb 2014 19:15:23 GMT", "version": "v1" } ]
2014-02-11
[ [ "Danevich", "F. A.", "" ], [ "Kobychev", "R. V.", "" ], [ "Kobychev", "V. V.", "" ], [ "Kraus", "H.", "" ], [ "Mikhailik", "V. B.", "" ], [ "Mokina", "V. M.", "" ] ]
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1402.2245
Carlos Lombardi
Carlos Lombardi, Alejandro R\'ios, Roel de Vrijer
Proof terms for infinitary rewriting, progress report
null
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We generalize the notion of proof term to the realm of transfinite reduction. Proof terms represent reductions in the first-order term format, thereby facilitating their formal analysis. We show that any transfinite reduction can be faithfully represented as an infinitary proof term, which is unique up to, infinitary, associativity. Our main use of proof terms is in a definition of permutation equivalence for transfinite reductions, on the basis of permutation equations. This definition involves a variant of equational logic, adapted for dealing with infinite objects. A proof of the compression property via proof terms is presented, which establishes permutation equivalence between the original and the compressed reductions.
[ { "created": "Mon, 10 Feb 2014 19:33:03 GMT", "version": "v1" }, { "created": "Wed, 12 Feb 2014 05:18:30 GMT", "version": "v2" } ]
2014-02-13
[ [ "Lombardi", "Carlos", "" ], [ "Ríos", "Alejandro", "" ], [ "de Vrijer", "Roel", "" ] ]
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1402.2248
Riccardo Faccini
E. Solfaroli Camillocci, G. Baroni, F. Bellini, V. Bocci, F. Collamati, M. Cremonesi, E. De Lucia, P. Ferroli, S. Fiore, C. M. Grana, M. Marafini, I. Mattei, S. Morganti, G. Paganelli, V. Patera, L. Piersanti, L. Recchia, A. Russomando, M. Schiariti, A. Sarti, A. Sciubba, C. Voena, R. Faccini
A novel radioguided surgery technique exploiting $\beta^{-}$ decays
14 pages, 7 figures
Sci. Rep. 4, 4401 (2014)
10.1038/srep04401
null
physics.med-ph physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The background induced by the high penetration power of the gamma radiation is the main limiting factor of the current Radio-guided surgery (RGS). To partially mitigate it, a RGS with beta+ emitting radio-tracers has been suggested in literature. Here we propose the use of beta- emitting radio-tracers and beta- probes and discuss the advantage of this method with respect to the previously explored ones: the electron low penetration power allows for simple and versatile probes and could extend RGS to tumours for which background originating from nearby healthy tissue makes gamma probes less effective. We developed a beta- probe prototype and studied its performances on phantoms. By means of a detailed simulation we have also extrapolated the results to estimate the performances in a realistic case of meningioma, pathology which is going to be our first in-vivo test case. A good sensitivity to residuals down to 0.1ml can be reached within 1s with an administered activity smaller than those for PET-scans thus making the radiation exposure to medical personnel negligible.
[ { "created": "Mon, 10 Feb 2014 19:47:16 GMT", "version": "v1" } ]
2014-03-17
[ [ "Camillocci", "E. Solfaroli", "" ], [ "Baroni", "G.", "" ], [ "Bellini", "F.", "" ], [ "Bocci", "V.", "" ], [ "Collamati", "F.", "" ], [ "Cremonesi", "M.", "" ], [ "De Lucia", "E.", "" ], [ "Ferroli", "P.", "" ], [ "Fiore", "S.", "" ], [ "Grana", "C. M.", "" ], [ "Marafini", "M.", "" ], [ "Mattei", "I.", "" ], [ "Morganti", "S.", "" ], [ "Paganelli", "G.", "" ], [ "Patera", "V.", "" ], [ "Piersanti", "L.", "" ], [ "Recchia", "L.", "" ], [ "Russomando", "A.", "" ], [ "Schiariti", "M.", "" ], [ "Sarti", "A.", "" ], [ "Sciubba", "A.", "" ], [ "Voena", "C.", "" ], [ "Faccini", "R.", "" ] ]
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1402.2252
Ovidiu Cristinel Stoica
Ovidiu-Cristinel Stoica
A principle of quantumness
Comments welcome!
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null
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quant-ph physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quantum correlations and other phenomena characteristic to a quantum world can be understood as simply consequences of a principle derived from the postulates of Quantum Mechanics. This explanatory principle states that these phenomena specific to the quantum world are caused by the tension between the constraints, or initial conditions, imposed by incompatible observations. This tension is found to be at the root of Bohr's complementarity, Heisenberg's uncertainty, results concerning nonlocality, contextuality, quantum correlations in time and space. This tension requires the presence of noncommuting observables, but noncommutativity doesn't always lead to the tension, and the two concepts are not exactly the same, as it will be explained and exemplified.
[ { "created": "Mon, 10 Feb 2014 20:00:26 GMT", "version": "v1" }, { "created": "Wed, 12 Feb 2014 20:50:00 GMT", "version": "v2" }, { "created": "Fri, 14 Feb 2014 06:45:24 GMT", "version": "v3" }, { "created": "Sun, 29 Jun 2014 19:38:17 GMT", "version": "v4" } ]
2014-07-01
[ [ "Stoica", "Ovidiu-Cristinel", "" ] ]
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1402.2255
Youssef Mroueh
Youssef Mroueh
Robust Phase Retrieval and Super-Resolution from One Bit Coded Diffraction Patterns
fixed notations
null
null
null
cs.IT math.IT math.ST stat.AP stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we study a realistic setup for phase retrieval, where the signal of interest is modulated or masked and then for each modulation or mask a diffraction pattern is collected, producing a coded diffraction pattern (CDP) [CLM13]. We are interested in the setup where the resolution of the collected CDP is limited by the Fraunhofer diffraction limit of the imaging system. We investigate a novel approach based on a geometric quantization scheme of phase-less linear measurements into (one-bit) coded diffraction patterns, and a corresponding recovery scheme. The key novelty in this approach consists in comparing pairs of coded diffractions patterns across frequencies: the one bit measurements obtained rely on the order statistics of the un-quantized measurements rather than their values . This results in a robust phase recovery, and unlike currently available methods, allows to efficiently perform phase recovery from measurements affected by severe (possibly unknown) non linear, rank preserving perturbations, such as distortions. Another important feature of this approach consists in the fact that it enables also super-resolution and blind-deconvolution, beyond the diffraction limit of a given imaging system.
[ { "created": "Mon, 10 Feb 2014 20:19:53 GMT", "version": "v1" }, { "created": "Mon, 24 Mar 2014 13:11:16 GMT", "version": "v2" } ]
2014-03-25
[ [ "Mroueh", "Youssef", "" ] ]
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1402.2266
Christian Lavault
Sidi Mohamed Sedjelmaci (LIPN), Christian Lavault (LIPN)
Improvements on the accelerated integer GCD algorithm
6 pages
Information Processing Letters 61, 1 (1997) 31--36
null
null
cs.DC cs.DM math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The present paper analyses and presents several improvements to the algorithm for finding the $(a,b)$-pairs of integers used in the $k$-ary reduction of the right-shift $k$-ary integer GCD algorithm. While the worst-case complexity of Weber's "Accelerated integer GCD algorithm" is $\cO\l(\log_\phi(k)^2\r)$, we show that the worst-case number of iterations of the while loop is exactly $\tfrac 12 \l\lfloor \log_{\phi}(k)\r\rfloor$, where $\phi := \tfrac 12 \l(1+\sqrt{5}\r)$.\par We suggest improvements on the average complexity of the latter algorithm and also present two new faster residual algorithms: the sequential and the parallel one. A lower bound on the probability of avoiding the while loop in our parallel residual algorithm is also given.
[ { "created": "Mon, 10 Feb 2014 20:43:46 GMT", "version": "v1" } ]
2014-02-11
[ [ "Sedjelmaci", "Sidi Mohamed", "", "LIPN" ], [ "Lavault", "Christian", "", "LIPN" ] ]
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1402.2269
Christian Franck
Christian Franck, Jeroen van de Graaf
Dining Cryptographers are Practical
12 pages
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The dining cryptographers protocol provides information-theoretically secure sender and recipient untraceability. However, the protocol is considered to be impractical because a malicious participant may disrupt the communication. We propose an implementation which provides information-theoretical security for senders and recipients, and in which a disruptor with limited computational capabilities can easily be detected.
[ { "created": "Mon, 10 Feb 2014 20:57:37 GMT", "version": "v1" }, { "created": "Mon, 16 Jun 2014 18:08:59 GMT", "version": "v2" }, { "created": "Sat, 3 Jan 2015 21:41:00 GMT", "version": "v3" } ]
2015-01-06
[ [ "Franck", "Christian", "" ], [ "van de Graaf", "Jeroen", "" ] ]
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1402.2271
Narges Hesami rostami
Narges Hesami Rostami and Esmaeil Kheirkhah and Mehrdad Jalali
An Optimized Semantic Web Service Composition Method Based on Clustering and Ant Colony Algorithm
8 pages, 2 figure, International Journal of Web & Semantic Technology (IJWesT)
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In today's Web, Web Services are created and updated on the fly. For answering complex needs of users, the construction of new web services based on existing ones is required. It has received a great attention from different communities. This problem is known as web services composition. However, it is one of big challenge problems of recent years in a distributed and dynamic environment. Web services can be composed manually but it is a time consuming task. The automatic web service composition is one of the key features for future the semantic web. The various approaches in field of web service compositions proposed by the researchers. In this paper, we propose a novel architecture for semantic web service composition using clustering and Ant colony algorithm.
[ { "created": "Mon, 10 Feb 2014 20:59:22 GMT", "version": "v1" } ]
2014-02-11
[ [ "Rostami", "Narges Hesami", "" ], [ "Kheirkhah", "Esmaeil", "" ], [ "Jalali", "Mehrdad", "" ] ]
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1402.2272
Gabriel Seiden Ph.D.
Gabriel Seiden and Sofia Curland
The Tongue as an Excitable Medium
null
New J. Phys. 17 (3) 033049 (2015)
10.1088/1367-2630/17/3/033049
null
physics.med-ph physics.bio-ph q-bio.TO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Geographic tongue (GT) is a benign condition affecting approximately 2% of the population, whereby the papillae covering the upper part of the tongue are lost due to a slowly expanding inflammation. The resultant dynamical appearance of the tongue has striking similarities with well known phenomena observed in excitable media, such as forest fires, cardiac dynamics and chemically-driven reaction-diffusion systems. Here we explore the dynamics associated with GT from a dynamical systems perspective, utilizing cellular automata simulations. We emphasize similarities with other excitable systems as well as unique features observed in GT. Our results shed light on the evolution of the inflammation and contribute to the classification of the severity of the condition, based on the characteristic patterns observed in GT patients.
[ { "created": "Sun, 9 Feb 2014 13:34:13 GMT", "version": "v1" } ]
2015-04-17
[ [ "Seiden", "Gabriel", "" ], [ "Curland", "Sofia", "" ] ]
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1402.2276
Thierry Passerat de Silans
Michelle O. Ara\'ujo, Hugo L. D. de S. Cavalcante, Marcos Ori\'a, Martine Chevrollier, Thierry Passerat de Silans, Romeu Castro and Danieverton Moretti
Measurement of the Kerr nonlinear refractive index of Cs vapor
16 pages, 5 figures
Physical Review A 88, 063818 (2013)
10.1103/PhysRevA.88.063818
null
physics.atom-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Atomic vapors are systems well suited for nonlinear optics studies but very few direct measurements of their nonlinear refractive index have been reported. Here we use the z-scan technique to measure the Kerr coefficient, $n_2$, for a Cs vapor. Our results are analyzed through a four-level model, and we show that coherence between excited levels as well as cross-population effects contribute to the Kerr-nonlinearity.
[ { "created": "Mon, 10 Feb 2014 21:00:01 GMT", "version": "v1" } ]
2014-02-12
[ [ "Araújo", "Michelle O.", "" ], [ "Cavalcante", "Hugo L. D. de S.", "" ], [ "Oriá", "Marcos", "" ], [ "Chevrollier", "Martine", "" ], [ "de Silans", "Thierry Passerat", "" ], [ "Castro", "Romeu", "" ], [ "Moretti", "Danieverton", "" ] ]
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1402.2284
Joshua Spitz
J. Spitz
Cross Section Measurements with Monoenergetic Muon Neutrinos
8 pages, 4 figures; accepted for publication in Phys. Rev. D.; typos fixed and references updated
Phys. Rev. D 89, 073007 (2014)
10.1103/PhysRevD.89.073007
null
physics.ins-det hep-ex hep-ph nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The monoenergetic 236 MeV muon neutrino from charged kaon decay-at-rest ($K^+ \rightarrow \mu^+ \nu_\mu$) can be used to produce a novel set of cross section measurements. Applicable for short- and long-baseline accelerator-based neutrino oscillation experiments, among others, such measurements would provide a "standard candle" for the energy reconstruction and interaction kinematics relevant for charged current neutrino events near this energy. This neutrino can also be exercised as a unique known-energy, purely weak interacting probe of the nucleus. A number of experiments are set to come online in the next few years that will be able to collect and characterize thousands of these events.
[ { "created": "Mon, 10 Feb 2014 21:00:21 GMT", "version": "v1" }, { "created": "Thu, 27 Mar 2014 15:12:37 GMT", "version": "v2" } ]
2014-05-20
[ [ "Spitz", "J.", "" ] ]
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1402.2297
Onur Varol
Onur Varol and Filippo Menczer
Connecting Dream Networks Across Cultures
6 pages, 3 figures
null
10.1145/2567948.2579697
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many species dream, yet there remain many open research questions in the study of dreams. The symbolism of dreams and their interpretation is present in cultures throughout history. Analysis of online data sources for dream interpretation using network science leads to understanding symbolism in dreams and their associated meaning. In this study, we introduce dream interpretation networks for English, Chinese and Arabic that represent different cultures from various parts of the world. We analyze communities in these networks, finding that symbols within a community are semantically related. The central nodes in communities give insight about cultures and symbols in dreams. The community structure of different networks highlights cultural similarities and differences. Interconnections between different networks are also identified by translating symbols from different languages into English. Structural correlations across networks point out relationships between cultures. Similarities between network communities are also investigated by analysis of sentiment in symbol interpretations. We find that interpretations within a community tend to have similar sentiment. Furthermore, we cluster communities based on their sentiment, yielding three main categories of positive, negative, and neutral dream symbols.
[ { "created": "Mon, 10 Feb 2014 21:02:14 GMT", "version": "v1" } ]
2014-02-12
[ [ "Varol", "Onur", "" ], [ "Menczer", "Filippo", "" ] ]
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1402.2300
Aaron Karper
Aaron Karper
Feature and Variable Selection in Classification
Part of master seminar in document analysis held by Marcus Eichenberger-Liwicki
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null
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cs.LG cs.AI stat.ML
http://creativecommons.org/licenses/publicdomain/
The amount of information in the form of features and variables avail- able to machine learning algorithms is ever increasing. This can lead to classifiers that are prone to overfitting in high dimensions, high di- mensional models do not lend themselves to interpretable results, and the CPU and memory resources necessary to run on high-dimensional datasets severly limit the applications of the approaches. Variable and feature selection aim to remedy this by finding a subset of features that in some way captures the information provided best. In this paper we present the general methodology and highlight some specific approaches.
[ { "created": "Mon, 10 Feb 2014 21:05:58 GMT", "version": "v1" } ]
2014-02-12
[ [ "Karper", "Aaron", "" ] ]
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1402.2302
David Mazziotti
Gergely Gidofalvi and David A. Mazziotti
Molecule-optimized Basis Sets and Hamiltonians for Accelerated Electronic Structure Calculations of Atoms and Molecules
null
J. Phys. Chem. A 118, 495 (2014)
10.1021/jp410191y
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Molecule-optimized basis sets, based on approximate natural orbitals, are developed for accelerating the convergence of quantum calculations with strongly correlated (multi-referenced) electrons. We use a low-cost approximate solution of the anti-Hermitian contracted Schr{\"o}dinger equation (ACSE) for the one- and two-electron reduced density matrices (RDMs) to generate an approximate set of natural orbitals for strongly correlated quantum systems. The natural-orbital basis set is truncated to generate a molecule-optimized basis set whose rank matches that of a standard correlation-consistent basis set optimized for the atoms. We show that basis-set truncation by approximate natural orbitals can be viewed as a one-electron unitary transformation of the Hamiltonian operator and suggest an extension of approximate natural-orbital truncations through two-electron unitary transformations of the Hamiltonian operator, such as those employed in the solution of the ACSE. The molecule-optimized basis set from the ACSE improves the accuracy of the equivalent standard atom-optimized basis set at little additional computational cost. We illustrate the method with the potential energy curves of hydrogen fluoride and diatomic nitrogen. Relative to the hydrogen fluoride potential energy curve from the ACSE in a polarized triple-zeta basis set, the ACSE curve in a molecule-optimized basis set, equivalent in size to a polarized double-zeta basis, has a nonparallelity error of 0.0154 a.u. which is significantly better than the nonparallelity error of 0.0252 a.u. from the polarized double-zeta basis set.
[ { "created": "Mon, 10 Feb 2014 21:14:45 GMT", "version": "v1" } ]
2014-02-12
[ [ "Gidofalvi", "Gergely", "" ], [ "Mazziotti", "David A.", "" ] ]
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1402.2308
Nathan Kallus
Nathan Kallus
Predicting Crowd Behavior with Big Public Data
null
null
10.1145/2567948.2579233
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With public information becoming widely accessible and shared on today's web, greater insights are possible into crowd actions by citizens and non-state actors such as large protests and cyber activism. We present efforts to predict the occurrence, specific timeframe, and location of such actions before they occur based on public data collected from over 300,000 open content web sources in 7 languages, from all over the world, ranging from mainstream news to government publications to blogs and social media. Using natural language processing, event information is extracted from content such as type of event, what entities are involved and in what role, sentiment and tone, and the occurrence time range of the event discussed. Statements made on Twitter about a future date from the time of posting prove particularly indicative. We consider in particular the case of the 2013 Egyptian coup d'etat. The study validates and quantifies the common intuition that data on social media (beyond mainstream news sources) are able to predict major events.
[ { "created": "Mon, 10 Feb 2014 21:23:14 GMT", "version": "v1" } ]
2014-02-12
[ [ "Kallus", "Nathan", "" ] ]
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1402.2310
Michele Sclafani
M. Marksteiner, A. Divochiy, M. Sclafani, P. Haslinger, H. Ulbricht, A. Korneev, A. Semenov, G. Goltsman and M. Arndt
A superconducting NbN detector for neutral nanoparticles
6 pages, 6 figures
Nanotechnology 20, 45501, 2009
10.1088/0957-4484/20/45/455501
null
physics.atm-clus physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a proof-of-principle study of superconducting single photon detectors (SSPD) for the detection of individual neutral molecules/nanoparticles at low energies. The new detector is applied to characterize a laser desorption source for biomolecules and it allows to retrieve the arrival time distribution of a pulsed molecular beam containing the amino acid tryptophan, the polypeptide gramicidin as well as insulin, myoglobin and hemoglobin. We discuss the experimental evidence that the detector is actually sensitive to isolated neutral particles.
[ { "created": "Mon, 10 Feb 2014 21:28:10 GMT", "version": "v1" } ]
2014-02-12
[ [ "Marksteiner", "M.", "" ], [ "Divochiy", "A.", "" ], [ "Sclafani", "M.", "" ], [ "Haslinger", "P.", "" ], [ "Ulbricht", "H.", "" ], [ "Korneev", "A.", "" ], [ "Semenov", "A.", "" ], [ "Goltsman", "G.", "" ], [ "Arndt", "M.", "" ] ]
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1402.2313
Michele Sclafani
M. Marksteiner, P. Haslinger, M. Sclafani, H. Ulbricht and M. Arndt
UV and VUV ionization of organic molecules, clusters and complexes
6 pages, 8 figures
J. Phys. Chem. A, 2009, 113 (37), 9952-9957
10.1021/jp905039f
null
physics.atm-clus
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The generation of organic particle beams is studied in combination with photoionization using uv radiation at 266 nm and vuv light at 157 nm. Single-photon ionization with pulsed vuv light turns out to be sensitive enough to detect various large neutral biomolecular complexes ranging from metal-amino acid complexes to nucleotide clusters and aggregates of polypeptides. Different biomolecular clusters are shown to exhibit rather specific binding characteristics with regard to the various metals that are co-desorbed in the source. We also find that the ion signal of gramicidin can be increased by a factor of fifteen when the photon energy is increased from 4.66 eV to 7.9 eV.
[ { "created": "Mon, 10 Feb 2014 21:40:22 GMT", "version": "v1" } ]
2014-02-12
[ [ "Marksteiner", "M.", "" ], [ "Haslinger", "P.", "" ], [ "Sclafani", "M.", "" ], [ "Ulbricht", "H.", "" ], [ "Arndt", "M.", "" ] ]
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1402.2318
Manoj Chaudhury
Chih-Hsiu Lin, Gregory S. Ferguson and Manoj K. Chaudhury
Electrokinetics of Polar Liquids in Contact with Non-Polar Surfaces
null
null
10.1021/la4008813
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Zeta potentials of several polar protic (water, ethylene glycol, formamide) as well as polar aprotic (dimethyl sulfoxide) liquids were measured in contact with three non-polar surfaces using closed-cell electro-osmosis. The test surfaces were chemisorbed monolayers of alkyl siloxanes, fluoroalkyl siloxanes and polydimethylsiloxanes (PDMS) grafted on glass slides. All these liquids exhibited substantial electrokinetics in contact with the non-polar surfaces with these observations: the electrokinetic effect on the fluorocarbon-coated surface is the strongest; and on a PDMS grafted surface, the effect is the weakest. Even though these hygroscopic liquids contain small amounts of water, the current models of charging based on the adsorption of hydroxide ions at the interface or the dissociation of preexisting functionalities (e.g., silanol groups) appear to be insufficient to account for the various facets of the experimental observations. The results illustrate how ubiquitous the phenomenon of electro-kinetics is with polar liquids contacting such apparently passive non-polar surfaces. We hope that these results will inspire further experimental and theoretical studies in this important area of research that has potential practical implications.
[ { "created": "Mon, 10 Feb 2014 22:19:56 GMT", "version": "v1" } ]
2014-02-12
[ [ "Lin", "Chih-Hsiu", "" ], [ "Ferguson", "Gregory S.", "" ], [ "Chaudhury", "Manoj K.", "" ] ]
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1402.2320
Chengyuan Ding
Chengyuan Ding, Wei Xiong, Tingting Fan, Daniel D. Hickstein, Tenio Popmintchev, Xiaoshi Zhang, Mike Walls, Margaret M. Murnane, and Henry C. Kapteyn
High flux coherent supercontinuum soft X-ray source driven by a single-stage 10 mJ, kHz, Ti:sapphire laser amplifier
9 pages, 3 figures, under Optics Express peer review
null
10.1364/OE.22.006194
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate the highest flux tabletop source of coherent soft X-rays to date, driven by a single-stage 10 mJ Ti:sapphire regenerative amplifier at 1 kHz. We first down-convert the laser to 1.3 um using a parametric amplifier, before up-converting it to soft X-rays using high harmonic generation in a high-pressure, phase matched, hollow waveguide geometry. The resulting optimally phase matched broadband spectrum extends to 200 eV, with a soft X-ray photon flux of > 10^6 photons/pulse/1% bandwidth at 1 kHz, corresponding to > 10^9 photons/s/1% bandwidth, or approximately a three order-of-magnitude increase compared with past work. Finally, using this broad bandwidth X-ray source, we demonstrate X-ray absorption spectroscopy of multiple elements and transitions in molecules in a single spectrum, with a spectral resolution of 0.25 eV, and with the ability to resolve the near edge fine structure.
[ { "created": "Mon, 10 Feb 2014 22:29:45 GMT", "version": "v1" } ]
2015-06-18
[ [ "Ding", "Chengyuan", "" ], [ "Xiong", "Wei", "" ], [ "Fan", "Tingting", "" ], [ "Hickstein", "Daniel D.", "" ], [ "Popmintchev", "Tenio", "" ], [ "Zhang", "Xiaoshi", "" ], [ "Walls", "Mike", "" ], [ "Murnane", "Margaret M.", "" ], [ "Kapteyn", "Henry C.", "" ] ]
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1402.2324
Srinadh Bhojanapalli
Srinadh Bhojanapalli, Prateek Jain
Universal Matrix Completion
22 pages, 2 figures
null
null
null
stat.ML cs.IT cs.LG math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The problem of low-rank matrix completion has recently generated a lot of interest leading to several results that offer exact solutions to the problem. However, in order to do so, these methods make assumptions that can be quite restrictive in practice. More specifically, the methods assume that: a) the observed indices are sampled uniformly at random, and b) for every new matrix, the observed indices are sampled afresh. In this work, we address these issues by providing a universal recovery guarantee for matrix completion that works for a variety of sampling schemes. In particular, we show that if the set of sampled indices come from the edges of a bipartite graph with large spectral gap (i.e. gap between the first and the second singular value), then the nuclear norm minimization based method exactly recovers all low-rank matrices that satisfy certain incoherence properties. Moreover, we also show that under certain stricter incoherence conditions, $O(nr^2)$ uniformly sampled entries are enough to recover any rank-$r$ $n\times n$ matrix, in contrast to the $O(nr\log n)$ sample complexity required by other matrix completion algorithms as well as existing analyses of the nuclear norm method.
[ { "created": "Mon, 10 Feb 2014 22:53:15 GMT", "version": "v1" }, { "created": "Fri, 11 Jul 2014 15:21:56 GMT", "version": "v2" } ]
2014-07-14
[ [ "Bhojanapalli", "Srinadh", "" ], [ "Jain", "Prateek", "" ] ]
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1402.2327
Zbigniew Lipi\'nski
Z. Lipi\'nski
On the role of symmetry in solving maximum lifetime problem in two-dimensional sensor networks
14 pages, 4 figures
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze a continuous and discrete symmetries of the maximum lifetime problem in two dimensional sensor networks. We show, how a symmetry of the network and invariance of the problem under a given transformation group $G$ can be utilized to simplify its solution. We prove, that for a $G$-invariant maximum lifetime problem there exists a $G$-invariant solution. Constrains which follow from the $G$-invariance allow to reduce the problem and its solution to a subset, an optimal fundamental region of the sensor network. We analyze in detail solutions of the maximum lifetime problem invariant under a group of isometry transformations of a two dimensional Euclidean plane.
[ { "created": "Mon, 10 Feb 2014 23:17:34 GMT", "version": "v1" }, { "created": "Wed, 16 Jul 2014 10:02:22 GMT", "version": "v2" } ]
2014-07-17
[ [ "Lipiński", "Z.", "" ] ]
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1402.2328
Thomas Vogel
Ying Wai Li, Thomas Vogel, Thomas W\"ust, and David P. Landau
A new paradigm for petascale Monte Carlo simulation: Replica exchange Wang-Landau sampling
Conference on Computational Physics 2013 - CCP 2013
null
10.1088/1742-6596/510/1/012012
null
physics.comp-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a generic, parallel Wang-Landau method that is naturally suited to implementation on massively parallel, petaflop supercomputers. The approach introduces a replica-exchange framework in which densities of states for overlapping sub-windows in energy space are determined iteratively by traditional Wang-Landau sampling. The advantages and general applicability of the method are demonstrated for several distinct systems that possess discrete or continuous degrees of freedom, including those with complex free energy landscapes and topological constraints.
[ { "created": "Mon, 10 Feb 2014 23:21:39 GMT", "version": "v1" } ]
2015-06-18
[ [ "Li", "Ying Wai", "" ], [ "Vogel", "Thomas", "" ], [ "Wüst", "Thomas", "" ], [ "Landau", "David P.", "" ] ]
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1402.2331
Prasad Raghavendra
Moritz Hardt, Raghu Meka, Prasad Raghavendra, and Benjamin Weitz
Computational Limits for Matrix Completion
null
null
null
null
cs.CC cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Matrix Completion is the problem of recovering an unknown real-valued low-rank matrix from a subsample of its entries. Important recent results show that the problem can be solved efficiently under the assumption that the unknown matrix is incoherent and the subsample is drawn uniformly at random. Are these assumptions necessary? It is well known that Matrix Completion in its full generality is NP-hard. However, little is known if make additional assumptions such as incoherence and permit the algorithm to output a matrix of slightly higher rank. In this paper we prove that Matrix Completion remains computationally intractable even if the unknown matrix has rank $4$ but we are allowed to output any constant rank matrix, and even if additionally we assume that the unknown matrix is incoherent and are shown $90%$ of the entries. This result relies on the conjectured hardness of the $4$-Coloring problem. We also consider the positive semidefinite Matrix Completion problem. Here we show a similar hardness result under the standard assumption that $\mathrm{P}\ne \mathrm{NP}.$ Our results greatly narrow the gap between existing feasibility results and computational lower bounds. In particular, we believe that our results give the first complexity-theoretic justification for why distributional assumptions are needed beyond the incoherence assumption in order to obtain positive results. On the technical side, we contribute several new ideas on how to encode hard combinatorial problems in low-rank optimization problems. We hope that these techniques will be helpful in further understanding the computational limits of Matrix Completion and related problems.
[ { "created": "Mon, 10 Feb 2014 23:43:11 GMT", "version": "v1" }, { "created": "Thu, 10 Apr 2014 07:30:37 GMT", "version": "v2" } ]
2014-04-11
[ [ "Hardt", "Moritz", "" ], [ "Meka", "Raghu", "" ], [ "Raghavendra", "Prasad", "" ], [ "Weitz", "Benjamin", "" ] ]
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1402.2333
Vincent Michalski
Vincent Michalski, Roland Memisevic, Kishore Konda
Modeling sequential data using higher-order relational features and predictive training
null
null
null
null
cs.LG cs.CV stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bi-linear feature learning models, like the gated autoencoder, were proposed as a way to model relationships between frames in a video. By minimizing reconstruction error of one frame, given the previous frame, these models learn "mapping units" that encode the transformations inherent in a sequence, and thereby learn to encode motion. In this work we extend bi-linear models by introducing "higher-order mapping units" that allow us to encode transformations between frames and transformations between transformations. We show that this makes it possible to encode temporal structure that is more complex and longer-range than the structure captured within standard bi-linear models. We also show that a natural way to train the model is by replacing the commonly used reconstruction objective with a prediction objective which forces the model to correctly predict the evolution of the input multiple steps into the future. Learning can be achieved by back-propagating the multi-step prediction through time. We test the model on various temporal prediction tasks, and show that higher-order mappings and predictive training both yield a significant improvement over bi-linear models in terms of prediction accuracy.
[ { "created": "Mon, 10 Feb 2014 23:53:29 GMT", "version": "v1" } ]
2014-02-12
[ [ "Michalski", "Vincent", "" ], [ "Memisevic", "Roland", "" ], [ "Konda", "Kishore", "" ] ]
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1402.2334
Geon-Bo Kim Mr
G.B. Kim, S. Choi, Y.S. Jang, H.J. Kim, Y.H. Kim, V.V. Kobychev, H.J. Lee, J.H. Lee, J.Y. Lee, M.K. Lee, S.J. Lee, W.S. Yoon
Thermal Model and Optimization of a Large Crystal Detector using a Metallic Magnetic Calorimeter
null
Journal of Low Temperature Physics, Volume 176, Issue 5-6, pp 637-643 (2014)
10.1007/s10909-014-1139-z
null
physics.ins-det hep-ex nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We established a simple thermal model of the heat flow in a large crystal detector designed for a neutrinoless double beta decay experiment. The detector is composed of a CaMoO$_{4}$ crystal and a metallic magnetic calorimeter (MMC). The thermal connection between the absorber and the sensor consists of a gold film evaporated on the crystal surface and gold bonding wires attached to this film and the MMC sensor. The model describes athermal and thermal processes of heat flow to the gold film. A successive experiment based on optimization calculations of the area and thickness of the gold film showed a significant improvement in the size and rise-time of the measured signals.
[ { "created": "Mon, 10 Feb 2014 23:56:24 GMT", "version": "v1" } ]
2014-09-12
[ [ "Kim", "G. B.", "" ], [ "Choi", "S.", "" ], [ "Jang", "Y. S.", "" ], [ "Kim", "H. J.", "" ], [ "Kim", "Y. H.", "" ], [ "Kobychev", "V. V.", "" ], [ "Lee", "H. J.", "" ], [ "Lee", "J. H.", "" ], [ "Lee", "J. Y.", "" ], [ "Lee", "M. K.", "" ], [ "Lee", "S. J.", "" ], [ "Yoon", "W. S.", "" ] ]
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1402.2335
Jason McEwen
Rafael E. Carrillo, Jason D. McEwen, Yves Wiaux
Sparsity averaging for radio-interferometric imaging
1 page, 1 figure, Proceedings of the Biomedical and Astronomical Signal Processing Frontiers (BASP) workshop 2013, Related journal publications available at http://arxiv.org/abs/arXiv:1208.2330 and http://arxiv.org/abs/1307.4370
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astro-ph.IM cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a novel regularization method for compressive imaging in the context of the compressed sensing (CS) theory with coherent and redundant dictionaries. Natural images are often complicated and several types of structures can be present at once. It is well known that piecewise smooth images exhibit gradient sparsity, and that images with extended structures are better encapsulated in wavelet frames. Therefore, we here conjecture that promoting average sparsity or compressibility over multiple frames rather than single frames is an extremely powerful regularization prior.
[ { "created": "Tue, 11 Feb 2014 00:09:36 GMT", "version": "v1" } ]
2014-02-12
[ [ "Carrillo", "Rafael E.", "" ], [ "McEwen", "Jason D.", "" ], [ "Wiaux", "Yves", "" ] ]
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1402.2337
Eduardo Nahmad Ph.D.
Estela Mayoral, Eduardo Nahmad-Achar, Jos\'e Manuel Mart\'inez-Magad\'an, Alejandro Ortega and Ismael Soto
Study of Structural Properties in Complex Fluids by Addition of Surfactants Using DPD Simulation
6 pages, 2 figures, and 2 tables. in J. Klapp et al. (eds.), Fluid Dynamics in Physics, Engineering and Environmental Applications Springer-Verlag Berlin Heidelberg 2013 ISBN: 978-3-642-27722-1, ISSN: 1431-2492
null
10.1007/978-3-642-27723-8
null
physics.chem-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we study the tertiary structure of ionic surfactants when the pH in the system is modified using electrostatic dissipative particle dynamics simulations (DPD). The dependence with pH and kind of surfactant is presented. Our simulations reproduce the experimental behavior reported in the literature. The scaling for the radius of gyration with the size of the molecule as a function of pH is also obtained.
[ { "created": "Tue, 11 Feb 2014 00:18:03 GMT", "version": "v1" } ]
2014-02-12
[ [ "Mayoral", "Estela", "" ], [ "Nahmad-Achar", "Eduardo", "" ], [ "Martínez-Magadán", "José Manuel", "" ], [ "Ortega", "Alejandro", "" ], [ "Soto", "Ismael", "" ] ]
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1402.2343
Sreechakra Goparaju
Sreechakra Goparaju, Salim El Rouayheb, Robert Calderbank
New Codes and Inner Bounds for Exact Repair in Distributed Storage Systems
Submitted to the IEEE International Symposium on Information Theory (ISIT) 2014. This draft contains 8 pages and 4 figures
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null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the exact-repair tradeoff between storage and repair bandwidth in distributed storage systems (DSS). We give new inner bounds for the tradeoff region and provide code constructions that achieve these bounds.
[ { "created": "Tue, 11 Feb 2014 01:08:03 GMT", "version": "v1" } ]
2014-02-12
[ [ "Goparaju", "Sreechakra", "" ], [ "Rouayheb", "Salim El", "" ], [ "Calderbank", "Robert", "" ] ]
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1402.2348
Anatoli Kheifets S
P. C. Deshmukh, A. Mandal, S. Saha, A. S. Kheifets, V. K. Dolmatov and S T Manson
Attosecond time delay in the photoionization of endohedral atoms A@C$_{60}$: A new probe of confinement resonances
null
Phys. Rev. A 89, 053424 (2014)
10.1103/PhysRevA.89.053424
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The effects of confinement resonances on photoelectron group delay (Wigner time delay) following ionization of an atom encapsulated inside a C$_{60}$ cage have been studied theoretically using both relativistic and non-relativistic random phase approximations. The results indicate clearly the resonant character of the confinement oscillations in time delay of the $4d$ shell of Xe@C$_{60}$ and present a most direct manifestation of Wigner time delay. These oscillations were missed in a previous theoretical investigation of Ar@C$_{60}$ [PRL 111, 203003 (2013)]
[ { "created": "Tue, 11 Feb 2014 01:38:18 GMT", "version": "v1" } ]
2014-06-11
[ [ "Deshmukh", "P. C.", "" ], [ "Mandal", "A.", "" ], [ "Saha", "S.", "" ], [ "Kheifets", "A. S.", "" ], [ "Dolmatov", "V. K.", "" ], [ "Manson", "S T", "" ] ]
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1402.2351
Flavio Figueiredo
Flavio Figueiredo, Jussara M. Almeida, Marcos Andr\'e Gon\c{c}alves, Fabr\'icio Benevenuto
TrendLearner: Early Prediction of Popularity Trends of User Generated Content
To appear at Elsevier Information Sciences Journal
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cs.SI cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We here focus on the problem of predicting the popularity trend of user generated content (UGC) as early as possible. Taking YouTube videos as case study, we propose a novel two-step learning approach that: (1) extracts popularity trends from previously uploaded objects, and (2) predicts trends for new content. Unlike previous work, our solution explicitly addresses the inherent tradeoff between prediction accuracy and remaining interest in the content after prediction, solving it on a per-object basis. Our experimental results show great improvements of our solution over alternatives, and its applicability to improve the accuracy of state-of-the-art popularity prediction methods.
[ { "created": "Tue, 11 Feb 2014 02:36:26 GMT", "version": "v1" }, { "created": "Tue, 25 Feb 2014 15:53:33 GMT", "version": "v2" }, { "created": "Mon, 7 Apr 2014 02:44:32 GMT", "version": "v3" }, { "created": "Sun, 14 Feb 2016 20:39:52 GMT", "version": "v4" } ]
2016-02-16
[ [ "Figueiredo", "Flavio", "" ], [ "Almeida", "Jussara M.", "" ], [ "Gonçalves", "Marcos André", "" ], [ "Benevenuto", "Fabrício", "" ] ]
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1402.2354
Kaden Hazzard
Kaden R. A. Hazzard, Bryce Gadway, Michael Foss-Feig, Bo Yan, Steven A. Moses, Jacob P. Covey, Norman Y. Yao, Mikhail D. Lukin, Jun Ye, Deborah S. Jin, and Ana Maria Rey
Many-body dynamics of dipolar molecules in an optical lattice
null
Phys. Rev. Lett. 113, 195302 (2014)
10.1103/PhysRevLett.113.195302
null
cond-mat.quant-gas physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Understanding the many-body dynamics of isolated quantum systems is one of the central challenges in modern physics. To this end, the direct experimental realization of strongly correlated quantum systems allows one to gain insights into the emergence of complex phenomena. Such insights enable the development of theoretical tools that broaden our understanding. Here, we theoretically model and experimentally probe with Ramsey spectroscopy the quantum dynamics of disordered, dipolar-interacting, ultracold molecules in a partially filled optical lattice. We report the capability to control the dipolar interaction strength, and we demonstrate that the many-body dynamics extends well beyond a nearest-neighbor or mean-field picture, and cannot be quantitatively described using previously available theoretical tools. We develop a novel cluster expansion technique and demonstrate that our theoretical method accurately captures the measured dependence of the spin dynamics on molecule number and on the dipolar interaction strength. In the spirit of quantum simulation, this agreement simultaneously benchmarks the new theoretical method and verifies our microscopic understanding of the experiment. Our findings pave the way for numerous applications in quantum information science, metrology, and condensed matter physics.
[ { "created": "Tue, 11 Feb 2014 03:15:41 GMT", "version": "v1" } ]
2015-02-03
[ [ "Hazzard", "Kaden R. A.", "" ], [ "Gadway", "Bryce", "" ], [ "Foss-Feig", "Michael", "" ], [ "Yan", "Bo", "" ], [ "Moses", "Steven A.", "" ], [ "Covey", "Jacob P.", "" ], [ "Yao", "Norman Y.", "" ], [ "Lukin", "Mikhail D.", "" ], [ "Ye", "Jun", "" ], [ "Jin", "Deborah S.", "" ], [ "Rey", "Ana Maria", "" ] ]
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1402.2359
Josef Urban
Cezary Kaliszyk, Josef Urban, Ji\v{r}\'i Vysko\v{c}il
Machine Learner for Automated Reasoning 0.4 and 0.5
null
null
null
null
cs.LG cs.AI cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Machine Learner for Automated Reasoning (MaLARea) is a learning and reasoning system for proving in large formal libraries where thousands of theorems are available when attacking a new conjecture, and a large number of related problems and proofs can be used to learn specific theorem-proving knowledge. The last version of the system has by a large margin won the 2013 CASC LTB competition. This paper describes the motivation behind the methods used in MaLARea, discusses the general approach and the issues arising in evaluation of such system, and describes the Mizar@Turing100 and CASC'24 versions of MaLARea.
[ { "created": "Tue, 11 Feb 2014 03:42:00 GMT", "version": "v1" }, { "created": "Wed, 28 May 2014 13:51:17 GMT", "version": "v2" } ]
2014-05-29
[ [ "Kaliszyk", "Cezary", "" ], [ "Urban", "Josef", "" ], [ "Vyskočil", "Jiří", "" ] ]
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1402.2363
Ashish Shingade ANS
Ashish Shingade and Archana Ghotkar
Animation of 3D Human Model Using Markerless Motion Capture Applied To Sports
null
null
null
null
cs.GR cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Markerless motion capture is an active research in 3D virtualization. In proposed work we presented a system for markerless motion capture for 3D human character animation, paper presents a survey on motion and skeleton tracking techniques which are developed or are under development. The paper proposed a method to transform the motion of a performer to a 3D human character (model), the 3D human character performs similar movements as that of a performer in real time. In the proposed work, human model data will be captured by Kinect camera, processed data will be applied on 3D human model for animation. 3D human model is created using open source software (MakeHuman). Anticipated dataset for sport activity is considered as input which can be applied to any HCI application.
[ { "created": "Tue, 11 Feb 2014 04:05:12 GMT", "version": "v1" } ]
2014-02-12
[ [ "Shingade", "Ashish", "" ], [ "Ghotkar", "Archana", "" ] ]
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1402.2368
Fangli Liu Mr.
Fangli Liu, Y.D. Chong, Shaffique Adam, Marco Polini
Gate-tunable coherent perfect absorption of terahertz radiation in graphene
To appear in 2D Materials
2D Materials 1, 031001 (2014)
10.1088/2053-1583/1/3/031001
null
physics.optics cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Perfect absorption of radiation in a graphene sheet may play a pivotal role in the realization of technologically relevant optoelectronic devices. In particular, perfect absorption of radiation in the terahertz (THz) spectral range would tremendously boost the utility of graphene in this difficult range of photon energies, which still lacks cheap and robust devices operating at room temperature. In this work we show that unpatterned graphene flakes deposited on appropriate substrates can display gate-tunable coherent perfect absorption (CPA) in the THz spectral range. We present theoretical estimates for the CPA operating frequency as a function of doping, which take into account the presence of common sources of disorder in graphene samples.
[ { "created": "Tue, 11 Feb 2014 04:24:10 GMT", "version": "v1" }, { "created": "Mon, 22 Sep 2014 05:28:37 GMT", "version": "v2" } ]
2014-11-25
[ [ "Liu", "Fangli", "" ], [ "Chong", "Y. D.", "" ], [ "Adam", "Shaffique", "" ], [ "Polini", "Marco", "" ] ]
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1402.2371
Zach Teitler
Grigoriy Blekherman, Zach Teitler
On Maximum, Typical and Generic Ranks
v1: 8pp. v2: 9pp. Corrected gap in Theorem 6, other minor corrections. v3: 10pp. Minor changes
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math.AG cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that for several notions of rank including tensor rank, Waring rank, and generalized rank with respect to a projective variety, the maximum value of rank is at most twice the generic rank. We show that over the real numbers, the maximum value of the real rank is at most twice the smallest typical rank, which is equal to the (complex) generic rank.
[ { "created": "Tue, 11 Feb 2014 04:51:48 GMT", "version": "v1" }, { "created": "Tue, 4 Mar 2014 05:42:56 GMT", "version": "v2" }, { "created": "Thu, 24 Jul 2014 23:02:25 GMT", "version": "v3" } ]
2014-07-28
[ [ "Blekherman", "Grigoriy", "" ], [ "Teitler", "Zach", "" ] ]
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1402.2372
Reena Philips Mrs
Poornima. U. S., Suma. V, Vasanth Kumar. H
Design Patterns as Quality Influencing Factor in Object Oriented Design Approach
4 Pages, 6 Figures
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Object Oriented Design methodology is an emerging software development approach for complex systems with huge set of requirements. Unlike procedural approach, it captures the requirements as a set of data rather than services, encapsulated as a single entity. The success such a project relies on major factors like design patterns framework, key principles, metric standards and best practices adapted by the industry. The patterns are key structures for recursive problem bits in the problem domain. The combination of design patterns forms a framework which suits the problem statement in hand. The pattern includes static design and dynamic behavior of different types of entities which can be mapped as a functional diagram with cardinalities between them. The degree of cardinality represents the coupling factor which the industry perceives and measures for software design quality. The organization specific design principles and rich repository of on-the-shelf patterns are the major design-quality-influencing-factor contribute to software success. These are the asset of an industry to deliver a quality product to sustain itself in the competitive market.
[ { "created": "Tue, 11 Feb 2014 04:58:01 GMT", "version": "v1" } ]
2014-02-12
[ [ "S.", "Poornima. U.", "" ], [ "V", "Suma.", "" ], [ "H", "Vasanth Kumar.", "" ] ]
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1402.2373
Reena Philips Mrs
Poornima. U. S., Suma. V
Visualization of Object Oriented Modeling from the Perspective of Set theory
Pages 5, 2 Figures
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Language is a medium for communication of our thoughts. Natural language is too wide to conceive and formulate the thoughts and ideas in a precise way. As science and technology grows, the necessity of languages arouses through which the thoughts are expressed in a better manner. Set Theory is such a mathematical language for expressing the thought of interest in a realistic way. It is well suited for presenting object oriented solution model, since this implementation methodology analyzes and modulates the requirements in a realistic way. Since the design flaws are one of the factors for software failure, industries are focusing on minimizing the design defects through better solution modeling techniques and quality assessment practices. The Object Oriented (OO) solution space can be visualized using the language of Set theory with which the design architecture of modules can be well defined. It provides a strong base to quantify the relationships within and between the modules, which is a mode for measuring the complexity of solution design of any software projects. This paper provides a visualization of OO modeling from the perspective of Set theory. Thereby, it paves the path for the designers to effectively design the application which is one of the challenges of a project development. Further, this mode of visualization enables one to effectively measure and controls the design complexity leading towards reducing the design flaws and enhanced software quality.
[ { "created": "Tue, 11 Feb 2014 05:05:03 GMT", "version": "v1" } ]
2014-02-12
[ [ "S.", "Poornima. U.", "" ], [ "V", "Suma.", "" ] ]
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1402.2374
Reena Philips Mrs
Poornima U. S., Suma. V
Factors Modulating Software Design Quality
7 Pages, 2 Figures
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Object oriented approach is one of the popular software development approach for managing complex systems with massive set of requirements. Unlike procedural approach, this approach captures the requirements as set of data rather than services. Further, class is considered as a key unit of the solution-domain with data and services wrapped together, representing architectural design of a basic module. Thus, system complexity is directly related to the number of modules and the degree of interaction between them. This could be mapped as a functional diagram with cardinalities between the modules. However, complexity is always a threat to quality at each stage of software development. Design phase is therefore one of the core influencing phases during development that selects the right architecture based on the problem statement which is bound to be measured for quality. Hence, software industries adapts several organization- specific principles, domain-specific patterns, metric standards and best practices to improve and measure the quality of both process and product. The paper highlights the factors which influence the overall design quality and metrics implication in improving the quality of final product. It also presents the solution domain as an interdependent layered architecture which has a greater impact on concluding the quality of the end product. This approach of design is a unique contribution to the domain of Object Oriented approach of software development. It also focuses on design metrics which ensures the implementation of right choice of design towards the retention of quality of the product.
[ { "created": "Tue, 11 Feb 2014 05:12:18 GMT", "version": "v1" } ]
2014-02-12
[ [ "S.", "Poornima U.", "" ], [ "V", "Suma.", "" ] ]
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1402.2375
Reena Philips Mrs
Poornima U. S., Suma. V
Significance of Coupling and Cohesion on Design Quality
6 Pages, 2 Figures
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In recent years, the complexity of the software is increasing due to automation of every segment of application. Software is nowhere remained as one-time development product since its architectural dimension is increasing with addition of new requirements over a short duration. Object Oriented Development (OOD) methodology is a popular development approach for such systems which perceives and models the requirements as real world entities. Classes and Objects logically represent the entities in the solution space and quality of the software is directly depending on the design quality of these logical entities. Cohesion and Coupling (C&C) are two major design decisive factors in OOD which impacts the design of a class and dependency between them in complex software. It is also most significant to measure C&C for software to control the complexity level as requirements increases. Several metrics are in practice to quantify C&C which plays a major role in measuring the design quality. The software industries are focusing on increasing and measuring the quality of the product through quality design to continue their market image in the competitive world. As a part of our research, this paper highlights on the impact of C&C on design quality of a complex system and its measures to quantify the overall quality of software.
[ { "created": "Tue, 11 Feb 2014 05:19:56 GMT", "version": "v1" } ]
2014-02-12
[ [ "S.", "Poornima U.", "" ], [ "V", "Suma.", "" ] ]
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1402.2376
Reena Philips Mrs
Sangita Gupta, Suma V
Prediction of Human Performance Capability during Software Development using Classification
7 Pages, 1 Figure
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The quality of human capital is crucial for software companies to maintain competitive advantages in knowledge economy era. Software companies recognize superior talent as a business advantage. They increasingly recognize the critical linkage between effective talent and business success. However, software companies suffering from high turnover rates often find it hard to recruit the right talents. There is an urgent need to develop a personnel selection mechanism to find the talents who are the most suitable for their software projects. Data mining techniques assures exploring the information from the historical projects depending on which the project manager can make decisions for producing high quality software. This study aims to fill the gap by developing a data mining framework based on decision tree and association rules to refocus on criteria for personnel selection. An empirical study was conducted in a software company to support their hiring decision for project members. The results demonstrated that there is a need to refocus on selection criteria for quality objectives. Better selection criteria was identified by patterns obtained from data mining models by integrating knowledge from software project database and authors research techniques.
[ { "created": "Tue, 11 Feb 2014 05:30:26 GMT", "version": "v1" } ]
2014-02-12
[ [ "Gupta", "Sangita", "" ], [ "V", "Suma", "" ] ]
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1402.2377
Reena Philips Mrs
Sangita Gupta, Suma. V
Empirical Study on Selection of Team Members for Software Projects - Data Mining Approach
6 Pages, 1 Figure. arXiv admin note: text overlap with arXiv:1201.3417 by other authors
International Journal of Computer Science and Informatics, ISSN PRINT: 2231 5292, Volume 3, Issue 2, 2013
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
One of the essential requisites of any software industry is the development of customer satisfied products. However, accomplishing the aforesaid business objective depends upon the depth of quality of product that is engineered in the organization. Thus, generation of high quality depends upon process, which is in turn depends upon the people. Existing scenario in IT industries demands a requirement for deploying the right personnel for achieving desirable quality in the product through the existing process. The goal of this paper is to identify the criteria which will be used in industrial practice to select members of a software project team, and to look for relationships between these criteria and project success. Using semi-structured interviews and qualitative methods for data analysis and synthesis, a set of team building criteria was identified from project managers in industry. The findings show that the consistent use of the set of criteria correlated significantly with project success, and the criteria related to human factors present strong correlations with software quality and thereby project success. This knowledge enables decision making for project managers in allocation of right personnel to realize desired level.
[ { "created": "Tue, 11 Feb 2014 05:39:50 GMT", "version": "v1" } ]
2014-02-12
[ [ "Gupta", "Sangita", "" ], [ "V", "Suma.", "" ] ]
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1402.2379
Reena Philips Mrs
Sangita Gupta, Suma V
Enhancing Human Aspect of Software Engineering using Bayesian Classifier
5 Pages, 2 Figures. arXiv admin note: substantial text overlap with arXiv:1104.4163, arXiv:1201.3418 by other authors
International Journal of Cognitive Science, Engineering, and Technology Volume 1, Issue 1, November 2013 ISSN 2347 8047
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
IT industries in current scenario have to struggle effectively in terms of cost, quality, service or innovation for their subsistence in the global market. Due to the swift transformation of technology, software industries owe to manage a large set of data having precious information hidden. Data mining technique enables one to effectively cope with this hidden information where it can be applied to code optimization, fault prediction and other domains which modulates the success nature of software projects. Additionally, the efficiency of the product developed further depends upon the quality of the project personnel. The position of the paper therefore is to explore potentials of project personnel in terms of their competency and skill set and its influence on quality of project. The above mentioned objective is accomplished using a Bayesian classifier in order to capture the pattern of human performance. By this means, the hidden and valuable knowledge discovered in the related databases will be summarized in the statistical structure. This mode of predictive study enables the project managers to reduce the failure ratio to a significant level and improve the performance of the project using the right choice of project personnel.
[ { "created": "Tue, 11 Feb 2014 05:44:48 GMT", "version": "v1" } ]
2014-02-12
[ [ "Gupta", "Sangita", "" ], [ "V", "Suma", "" ] ]
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1402.2389
J\"urgen M\"unch
Adam Trendowicz, Jens Heidrich, J\"urgen M\"unch
Supporting Process Maturation with the Enhanced CoBRA Method
14 pages. Proceedings of the DASMA Software Metric Congress (MetriKon 2006), Magdeburger Schriften zum Empirischen Software Engineering, pages 3-16, Potsdam, Germany, November 2-3 2006. Shaker Verlag
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null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cost estimation is a very crucial field for software developing companies. In the context of learning organizations, estimation applicability and accuracy are not the only acceptance criteria. The contribution of an estimation technique to the understanding and maturing of related organizational processes (such as identification of cost and productivity factors, measurement, data validation, model validation, model maintenance) has recently been gaining increasing importance. Yet, most of the proposed cost modeling approaches provide software engineers with hardly any assistance in supporting related processes. Insufficient support is provided for validating created cost models (including underlying data collection processes) or, if valid models are obtained, for applying them to achieve an organization's objectives such as improved productivity or reduced schedule. This paper presents an enhancement of the CoBRA(R) cost modeling method by systematically including additional quantitative methods into iterative analysis-feedback cycles. Applied at Oki Electric Industry Co., Ltd., Japan, the CoBRA(R) method contributed to the achievement of the following objectives, including: (1) maturation of existing measurement processes, (2) increased expertise of Oki software project decision makers regarding cost-related software processes, and, finally, (3) reduction of initial estimation error from an initial 120% down to 14%.
[ { "created": "Tue, 11 Feb 2014 07:52:16 GMT", "version": "v1" } ]
2014-02-12
[ [ "Trendowicz", "Adam", "" ], [ "Heidrich", "Jens", "" ], [ "Münch", "Jürgen", "" ] ]
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1402.2390
Shuqin Li
Shuqin Li and Liyu Cai
A Distributed Optimization Framework For Multi-channel Multi-user Small Cell Networks
Technical report of the paper with the same name to be published in IEEE communication letters
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null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Small cell enchantment is emerging as the key technique for wireless network evolution. One challenging problem for small cell enhancement is how to achieve high data rate with as-low-as-possible control and computation overheads. As a solution, we propose a low-complexity distributed optimization framework in this paper. Our solution includes two parts. One is a novel implicit information exchange mechanism that enables channel-aware opportunistic scheduling and resource allocation among links. The other is the sub-gradient based algorithm with a polynomial-time complexity. What is more, for large scale systems, we design an improved distributed algorithm based on insights obtained from the problem structure. This algorithm achieves a close-to-optimal performance with a much lower complexity. Our numerical evaluations validate the analytical results and show the advantage of our algorithms.
[ { "created": "Tue, 11 Feb 2014 08:06:38 GMT", "version": "v1" } ]
2014-02-12
[ [ "Li", "Shuqin", "" ], [ "Cai", "Liyu", "" ] ]
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1402.2394
Joseph Gonzalez
Reynold S. Xin, Daniel Crankshaw, Ankur Dave, Joseph E. Gonzalez, Michael J. Franklin, Ion Stoica
GraphX: Unifying Data-Parallel and Graph-Parallel Analytics
null
null
null
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
From social networks to language modeling, the growing scale and importance of graph data has driven the development of numerous new graph-parallel systems (e.g., Pregel, GraphLab). By restricting the computation that can be expressed and introducing new techniques to partition and distribute the graph, these systems can efficiently execute iterative graph algorithms orders of magnitude faster than more general data-parallel systems. However, the same restrictions that enable the performance gains also make it difficult to express many of the important stages in a typical graph-analytics pipeline: constructing the graph, modifying its structure, or expressing computation that spans multiple graphs. As a consequence, existing graph analytics pipelines compose graph-parallel and data-parallel systems using external storage systems, leading to extensive data movement and complicated programming model. To address these challenges we introduce GraphX, a distributed graph computation framework that unifies graph-parallel and data-parallel computation. GraphX provides a small, core set of graph-parallel operators expressive enough to implement the Pregel and PowerGraph abstractions, yet simple enough to be cast in relational algebra. GraphX uses a collection of query optimization techniques such as automatic join rewrites to efficiently implement these graph-parallel operators. We evaluate GraphX on real-world graphs and workloads and demonstrate that GraphX achieves comparable performance as specialized graph computation systems, while outperforming them in end-to-end graph pipelines. Moreover, GraphX achieves a balance between expressiveness, performance, and ease of use.
[ { "created": "Tue, 11 Feb 2014 08:23:49 GMT", "version": "v1" } ]
2014-02-12
[ [ "Xin", "Reynold S.", "" ], [ "Crankshaw", "Daniel", "" ], [ "Dave", "Ankur", "" ], [ "Gonzalez", "Joseph E.", "" ], [ "Franklin", "Michael J.", "" ], [ "Stoica", "Ion", "" ] ]
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1402.2395
Michele Marrocco
Michele Marrocco, Emil Nordstrom, Per-Erik Bengtsson
Lineshapes in coherent anti-Stokes Raman spectra of gases
null
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce new lineshapes of coherent anti-Stokes Raman spectra of gases by considering realistic nanosecond laser pulses that deviate from the Gaussian representations of their time and spectral envelopes. The analysis suggests that the contribution to the linewidth caused by the interaction with such laser pulses could be erroneously attributed to the intrinsic Raman width if the customary CARS approach, based primarily on the Voigt lineshape, is assumed.
[ { "created": "Tue, 11 Feb 2014 08:24:17 GMT", "version": "v1" } ]
2014-02-12
[ [ "Marrocco", "Michele", "" ], [ "Nordstrom", "Emil", "" ], [ "Bengtsson", "Per-Erik", "" ] ]
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1402.2396
Sven Marcus Ulrich
S. M. Ulrich, S. Weiler, M. Oster, M. Jetter, A. Urvoy, R. L\"ow, and P. Michler
Spectroscopy of the D1-transition of cesium by dressed-state resonance fluorescence from a single (In,Ga)As/GaAs quantum dot
null
null
10.1103/PhysRevB.90.125310
null
physics.optics cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use a laser-driven single (In,Ga)As quantum dot (QD) in the dressed state regime of resonance fluorescence ($T = 4$ K) to observe the four $D_1$-transition lines of alkali atomic cesium ($Cs$) vapor at room temperature. We tune the frequency of the dressing continuous-wave laser in the vicinity of the bare QD resonance $\sim 335.116$ THz ($\sim 894.592$ nm) at constant excitation power and thereby controllably tune the center and side channel frequencies of the probe light, i.e. the Mollow triplet. Resonances between individual QD Mollow triplet lines and the atomic hyperfine-split transitions are clearly identified in the $Cs$ absorption spectrum. Our results show that narrow-band (In,Ga)As QD resonance fluorescence (RF) is suitable to optically address individual transitions of the $D_1$ quadruplet without applying magnetic field or electric field tuning.
[ { "created": "Tue, 11 Feb 2014 08:31:12 GMT", "version": "v1" } ]
2015-06-18
[ [ "Ulrich", "S. M.", "" ], [ "Weiler", "S.", "" ], [ "Oster", "M.", "" ], [ "Jetter", "M.", "" ], [ "Urvoy", "A.", "" ], [ "Löw", "R.", "" ], [ "Michler", "P.", "" ] ]
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1402.2400
Mirco Siercke Ph.D.
M. Siercke, F.E. Oon, A. Mohan, Z.W. Wang, M.J. Lim and R. Dumke
Density dependence of the Ionization Avalanche in ultracold Rydberg gases
5 pages, 4 figures
Phys. Rev. A 89, 022701 (2014)
10.1103/PhysRevA.89.022701
null
physics.atom-ph physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on the behaviour of the ionization avalanche in an ensemble of ultracold 87Rb atoms coupled to a high lying Rydberg state and investigate extensions to the current model by including the effects of three-body recombination and plasma expansion. To separate the two effects we study the time dependence of the plasma formation at various densities as well as for different nS and nD states. At medium densities and low n we observe the onset of the avalanche as has been reported in other experiments, as well as a subsequent turn-off of the avalanche for longer excitation times, which we associate with plasma expansion. At higher densities and for higher lying Rydberg states we observe a disappearance of the avalanche signature, which we attribute to three-body recombination.
[ { "created": "Tue, 11 Feb 2014 08:50:31 GMT", "version": "v1" } ]
2014-02-12
[ [ "Siercke", "M.", "" ], [ "Oon", "F. E.", "" ], [ "Mohan", "A.", "" ], [ "Wang", "Z. W.", "" ], [ "Lim", "M. J.", "" ], [ "Dumke", "R.", "" ] ]
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1402.2404
Sneha Jm
J.M. Sneha, G.S.Nagaraja
Virtual Learning Environments-A Survey
5 pages, IJCTT Journal
null
null
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper is based on the study of existing literature, highlights the current state of the work proposed to implement technically enhanced learning. Technology developments and network infrastructure improvements, specifically the world wide web) are providing exciting opportunities for the use of computers in all areas. These developments have fit together with an evolving role for education as more students wish to study at a distance, part time, or wish to integrate their education with their professional career. With the market becoming increasingly mature, e learning has almost become a major plank in both national and institutional strategies. At the same time, virtual learning system is also gaining its popularity among its users. It has brought in a great revolution in itself. In the advanced learning strategy, virtual learning systems depends on level and sector of working, usage of functions, purpose of usage, required online resources to perform computationally intensive operations such as information sharing and collaborative work. Often the institutions prefer the latest and the best technology which is cost effective and provide the best features which meet up all requirements. Virtual learning environment enables operator professional to bring together in one place a variety of prevailing resources, suchlike tasks and formative feedback, and links to law reports, statutes and journal articles, all intended at summing up value to student learning managing learning experience without the burden of communication and providing successful delivery of education and training with flexibility. In spite of the hype achieved by organizations in technically enhanced learning, the growth of the virtual learning systems users is still below expectations due to the risks associated with the implementation strategy and provision of technical support.
[ { "created": "Tue, 11 Feb 2014 09:02:58 GMT", "version": "v1" } ]
2014-02-12
[ [ "Sneha", "J. M.", "" ], [ "Nagaraja", "G. S.", "" ] ]
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1402.2406
Gagan Mohanty
T. Aziz, S.R. Chendvankar, G.B. Mohanty, M.R. Patil, K.K. Rao, Y.R. Rani, Y.P.P. Rao, H. Behnamian, S. Mersi, M. Naseri
Design, fabrication and characterization of the first AC-coupled silicon microstrip sensors in India
10 pages, 11 figures, 1 table, to appear in JINST
JINST 9 (2014) P06008
10.1088/1748-0221/9/06/P06008
null
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper reports the design, fabrication and characterization of single-sided silicon microstrip sensors with integrated biasing resistors and coupling capacitors, produced for the first time in India. We have first developed a prototype sensor on a four-inch wafer. After finding suitable test procedures for characterizing these AC coupled sensors, we have fine-tuned various process parameters in order to produce sensors with the desired specifications.
[ { "created": "Tue, 11 Feb 2014 09:18:33 GMT", "version": "v1" }, { "created": "Thu, 8 May 2014 15:39:37 GMT", "version": "v2" } ]
2014-06-27
[ [ "Aziz", "T.", "" ], [ "Chendvankar", "S. R.", "" ], [ "Mohanty", "G. B.", "" ], [ "Patil", "M. R.", "" ], [ "Rao", "K. K.", "" ], [ "Rani", "Y. R.", "" ], [ "Rao", "Y. P. P.", "" ], [ "Behnamian", "H.", "" ], [ "Mersi", "S.", "" ], [ "Naseri", "M.", "" ] ]
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1402.2409
Christoph Koutschan
Shaoshi Chen, Manuel Kauers, Christoph Koutschan
A Generalized Apagodu-Zeilberger Algorithm
null
Proceedings of the International Symposium on Symbolic and Algebraic Computation (ISSAC 2014), pages 107-114, 2014. ACM, New York, USA, ISBN 978-1-4503-2501-1
10.1145/2608628.2608641
null
cs.SC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Apagodu-Zeilberger algorithm can be used for computing annihilating operators for definite sums over hypergeometric terms, or for definite integrals over hyperexponential functions. In this paper, we propose a generalization of this algorithm which is applicable to arbitrary $\partial$-finite functions. In analogy to the hypergeometric case, we introduce the notion of proper $\partial$-finite functions. We show that the algorithm always succeeds for these functions, and we give a tight a priori bound for the order of the output operator.
[ { "created": "Tue, 11 Feb 2014 09:35:59 GMT", "version": "v1" }, { "created": "Tue, 22 Apr 2014 15:03:50 GMT", "version": "v2" }, { "created": "Sat, 2 Aug 2014 19:32:33 GMT", "version": "v3" } ]
2014-08-05
[ [ "Chen", "Shaoshi", "" ], [ "Kauers", "Manuel", "" ], [ "Koutschan", "Christoph", "" ] ]
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1402.2410
Florian Lonsing
Florian Lonsing and Uwe Egly
Incremental QBF Solving
revision (camera-ready, to appear in the proceedings of CP 2014, LNCS, Springer)
null
10.1007/978-3-319-10428-7_38
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of incrementally solving a sequence of quantified Boolean formulae (QBF). Incremental solving aims at using information learned from one formula in the process of solving the next formulae in the sequence. Based on a general overview of the problem and related challenges, we present an approach to incremental QBF solving which is application-independent and hence applicable to QBF encodings of arbitrary problems. We implemented this approach in our incremental search-based QBF solver DepQBF and report on implementation details. Experimental results illustrate the potential benefits of incremental solving in QBF-based workflows.
[ { "created": "Tue, 11 Feb 2014 09:36:53 GMT", "version": "v1" }, { "created": "Thu, 22 May 2014 10:47:27 GMT", "version": "v2" }, { "created": "Mon, 23 Jun 2014 08:52:30 GMT", "version": "v3" } ]
2014-09-05
[ [ "Lonsing", "Florian", "" ], [ "Egly", "Uwe", "" ] ]
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1402.2415
Pradeep Singla
Pradeep Singla, Devraj Gautam
Reversible Squaring Circuit For Low Power Digital Signal Processing
This paper has been withdrawn by the author due to a crucial sign error in design fig. 3(b)
International Journal of Electronics, Computer & Communication Technology, Volume 4, Issue- 2, Jan-2014
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cs.AR
http://creativecommons.org/licenses/by/3.0/
With the high demand of low power digital systems, energy dissipation in the digital system is one of the limiting factors. Reversible logic is one of the alternate to reduce heat/energy dissipation in the digital circuits and have a very significant importance in bioinformatics, optical information processing, CMOS design etc. In this paper the authors propose the design of new 2- bit binary Squaring circuit used in most of the digital signal processing hardware using Feynman & MUX gate. The proposed squaring circuit having less garbage outputs, constant inputs, Quantum cost and Total logical calculation i.e. less delay as compared to the traditional method of squaring operation by reversible multiplier. The simulating results and quantized results are also shown in the paper which shows the greatest improvement in the design against the previous methodology.
[ { "created": "Tue, 11 Feb 2014 10:01:15 GMT", "version": "v1" }, { "created": "Wed, 17 Dec 2014 03:35:20 GMT", "version": "v2" } ]
2014-12-18
[ [ "Singla", "Pradeep", "" ], [ "Gautam", "Devraj", "" ] ]
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1402.2416
Maxime Hubert
M. Hubert, D. Robert, H. Caps, S. Dorbolo and N. Vandewalle
Resonant and antiresonant bouncing droplets
4 pages, 4 figures and 1 video
null
10.1103/PhysRevE.91.023017
null
cond-mat.soft physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
When placed onto a vibrating liquid bath, a droplet may adopt a permanent bouncing behavior, depending on both the forcing frequency and the forcing amplitude. The relationship between the droplet deformations and the bouncing mechanism is studied experimentally and theoretically through an asymmetric and dissipative bouncing spring model. Antiresonance effects are evidenced. Experiments and theoretical predictions show that both resonance at specific frequencies and antiresonance at Rayleigh frequencies play crucial roles in the bouncing mechanism. In particular, we show that they can be exploited for droplet size selection.
[ { "created": "Tue, 11 Feb 2014 10:01:20 GMT", "version": "v1" } ]
2015-06-18
[ [ "Hubert", "M.", "" ], [ "Robert", "D.", "" ], [ "Caps", "H.", "" ], [ "Dorbolo", "S.", "" ], [ "Vandewalle", "N.", "" ] ]
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1402.2418
Aldo Antognini Dr
Yu Bao, Aldo Antognini, Wilhelm Bertl, Malte Hildebrandt, Kim Siang Khaw, Klaus Kirch, Angela Papa, Claude Petitjean, Florian M. Piegsa, Stefan Ritt, Kamil Sedlak, Alexey Stoykov, David Taqqu
Muon cooling: longitudinal compression
5 pages, 6 figures
null
10.1103/PhysRevLett.112.224801
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A 10 MeV/c $\mu^+$ beam was stopped in helium gas of a few mbar in a magnetic field of 5 T. The muon 'swarm' has been efficiently compressed from a length of 16 cm down to a few mm along the magnetic field axis (longitudinal compression) using electrostatic fields. The simulation reproduces the low energy interactions of slow muons in helium gas. Phase space compression occurs on the order of microseconds, compatible with the muon lifetime of 2 $\mu$s. This paves the way for preparation of a high quality muon beam.
[ { "created": "Tue, 11 Feb 2014 10:05:57 GMT", "version": "v1" } ]
2015-06-18
[ [ "Bao", "Yu", "" ], [ "Antognini", "Aldo", "" ], [ "Bertl", "Wilhelm", "" ], [ "Hildebrandt", "Malte", "" ], [ "Khaw", "Kim Siang", "" ], [ "Kirch", "Klaus", "" ], [ "Papa", "Angela", "" ], [ "Petitjean", "Claude", "" ], [ "Piegsa", "Florian M.", "" ], [ "Ritt", "Stefan", "" ], [ "Sedlak", "Kamil", "" ], [ "Stoykov", "Alexey", "" ], [ "Taqqu", "David", "" ] ]
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1402.2420
Bei Yu
Bei Yu and Jhih-Rong Gao and David Z. Pan
L-Shape based Layout Fracturing for E-Beam Lithography
null
null
10.1109/ASPDAC.2013.6509604
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Layout fracturing is a fundamental step in mask data preparation and e-beam lithography (EBL) writing. To increase EBL throughput, recently a new L-shape writing strategy is proposed, which calls for new L-shape fracturing, versus the conventional rectangular fracturing. Meanwhile, during layout fracturing, one must minimize very small/narrow features, also called slivers, due to manufacturability concern. This paper addresses this new research problem of how to perform L-shaped fracturing with sliver minimization. We propose two novel algorithms. The first one, rectangular merging (RM), starts from a set of rectangular fractures and merges them optimally to form L-shape fracturing. The second algorithm, direct L-shape fracturing (DLF), directly and effectively fractures the input layouts into L-shapes with sliver minimization. The experimental results show that our algorithms are very effective.
[ { "created": "Tue, 11 Feb 2014 10:10:39 GMT", "version": "v1" } ]
2014-02-12
[ [ "Yu", "Bei", "" ], [ "Gao", "Jhih-Rong", "" ], [ "Pan", "David Z.", "" ] ]
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1402.2421
Anna Rabitti
Anna Rabitti and Leo R. M. Maas
Meridional trapping and zonal propagation of inertial waves in a rotating fluid shell
null
Journal of Fluid Mechanics 729 (July 24): 445-470, 2013
10.1017/jfm.2013.310
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Inertial waves propagate in homogeneous rotating fluids, and constitute a challenging and simplified case study for the broader class of inertio-gravity waves, present in all geophysical and astrophysical media, and responsible for energetically costly processes as diapycnal and angular momentum mixing. However, a complete analytical description and understanding of internal waves in arbitrarily shaped enclosed domains, such as the ocean, or a planet liquid core, is still missing. In this work, the inviscid, linear inertial wave field is investigated by means of three dimensional ray tracing in spherical shell domains, having in mind possible oceanographic applications. Rays are here classically interpreted as representative of energy paths. But in contrast with previous studies, they are now launched with a non-zero initial zonal component allowing for a more realistic, localized forcing, and the development of azimuthal inhomogeneities. We find that meridional planes generally act in the shell geometry as attractors for ray trajectories. In addition, the existence of trajectories that are not subject to meridional trapping is here observed for the first time. Their dynamics was not captured by the previous purely meridional studies and unveils a new class of possible solutions for inertial motion in the spherical shell. Both observed behaviours shed some new light on possible mechanisms of energy localization, a key process that still deserves further investigation in our ocean, as well as in other stratified, rotating media.
[ { "created": "Tue, 11 Feb 2014 10:10:40 GMT", "version": "v1" } ]
2014-02-12
[ [ "Rabitti", "Anna", "" ], [ "Maas", "Leo R. M.", "" ] ]
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1402.2423
Robert Fickler
Robert Fickler, Radek Lapkiewicz, Marcus Huber, Martin P. J. Lavery, Miles J. Padgett, Anton Zeilinger
Interface between path and OAM entanglement for high-dimensional photonic quantum information
Journal reference added. Additonal measurements can be found in the journal version. 5 pages incl. 4 figures plus 2 pages supplementary information
Nature Communications 5, 4502 (2014)
10.1038/ncomms5502
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Photonics has become a mature field of quantum information science, where integrated optical circuits offer a way to scale the complexity of the setup as well as the dimensionality of the quantum state. On photonic chips, paths are the natural way to encode information. To distribute those high-dimensional quantum states over large distances, transverse spatial modes, like orbital angular momentum (OAM) possessing Laguerre Gauss modes, are favourable as flying information carriers. Here we demonstrate a quantum interface between these two vibrant photonic fields. We create three-dimensional path entanglement between two photons in a non-linear crystal and use a mode sorter as the quantum interface to transfer the entanglement to the OAM degree of freedom. Thus our results show a novel, flexible way to create high-dimensional spatial mode entanglement. Moreover, they pave the way to implement broad complex quantum networks where high-dimensionally entangled states could be distributed over distant photonic chips.
[ { "created": "Tue, 11 Feb 2014 10:18:50 GMT", "version": "v1" }, { "created": "Mon, 24 Feb 2014 16:32:28 GMT", "version": "v2" }, { "created": "Wed, 6 Aug 2014 13:54:58 GMT", "version": "v3" } ]
2014-08-07
[ [ "Fickler", "Robert", "" ], [ "Lapkiewicz", "Radek", "" ], [ "Huber", "Marcus", "" ], [ "Lavery", "Martin P. J.", "" ], [ "Padgett", "Miles J.", "" ], [ "Zeilinger", "Anton", "" ] ]
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1402.2425
Bei Yu
Bei Yu and Jhih-Rong Gao and David Z. Pan
Triple Patterning Lithography (TPL) Layout Decomposition using End-Cutting
null
null
10.1117/12.2011355
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Triple patterning lithography (TPL) is one of the most promising techniques in the 14nm logic node and beyond. However, traditional LELELE type TPL technology suffers from native conflict and overlapping problems. Recently LELEEC process was proposed to overcome the limitations, where the third mask is used to generate the end-cuts. In this paper we propose the first study for LELEEC layout decomposition. Conflict graphs and end-cut graphs are constructed to extract all the geometrical relationships of input layout and end-cut candidates. Based on these graphs, integer linear programming (ILP) is formulated to minimize the conflict number and the stitch number.
[ { "created": "Tue, 11 Feb 2014 10:26:20 GMT", "version": "v1" } ]
2014-02-12
[ [ "Yu", "Bei", "" ], [ "Gao", "Jhih-Rong", "" ], [ "Pan", "David Z.", "" ] ]
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1402.2426
Keith Dillon
Keith Dillon and Yeshaiahu Fainman
Imaging with Rays: Microscopy, Medical Imaging, and Computer Vision
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we broadly consider techniques which utilize projections on rays for data collection, with particular emphasis on optical techniques. We formulate a variety of imaging techniques as either special cases or extensions of tomographic reconstruction. We then consider how the techniques must be extended to describe objects containing occlusion, as with a self-occluding opaque object. We formulate the reconstruction problem as a regularized nonlinear optimization problem to simultaneously solve for object brightness and attenuation, where the attenuation can become infinite. We demonstrate various simulated examples for imaging opaque objects, including sparse point sources, a conventional multiview reconstruction technique, and a super-resolving technique which exploits occlusion to resolve an image.
[ { "created": "Tue, 11 Feb 2014 10:26:31 GMT", "version": "v1" } ]
2014-02-12
[ [ "Dillon", "Keith", "" ], [ "Fainman", "Yeshaiahu", "" ] ]
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1402.2427
Georg Groh
Jan Hauffa, Tobias Lichtenberg, Georg Groh
An evaluation of keyword extraction from online communication for the characterisation of social relations
null
null
null
null
cs.SI cs.CL cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The set of interpersonal relationships on a social network service or a similar online community is usually highly heterogenous. The concept of tie strength captures only one aspect of this heterogeneity. Since the unstructured text content of online communication artefacts is a salient source of information about a social relationship, we investigate the utility of keywords extracted from the message body as a representation of the relationship's characteristics as reflected by the conversation topics. Keyword extraction is performed using standard natural language processing methods. Communication data and human assessments of the extracted keywords are obtained from Facebook users via a custom application. The overall positive quality assessment provides evidence that the keywords indeed convey relevant information about the relationship.
[ { "created": "Tue, 11 Feb 2014 10:27:43 GMT", "version": "v1" } ]
2014-02-12
[ [ "Hauffa", "Jan", "" ], [ "Lichtenberg", "Tobias", "" ], [ "Groh", "Georg", "" ] ]
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1402.2435
Bei Yu
Bei Yu and Kun Yuan and Jhih-Rong Gao and David Z. Pan
E-BLOW: E-Beam Lithography Overlapping aware Stencil Planning for MCC System
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null
null
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Electron beam lithography (EBL) is a promising maskless solution for the technology beyond 14nm logic node. To overcome its throughput limitation, recently the traditional EBL system is extended into MCC system. %to further improve the throughput. In this paper, we present E-BLOW, a tool to solve the overlapping aware stencil planning (OSP) problems in MCC system. E-BLOW is integrated with several novel speedup techniques, i.e., successive relaxation, dynamic programming and KD-Tree based clustering, to achieve a good performance in terms of runtime and solution quality. Experimental results show that, compared with previous works, E-BLOW demonstrates better performance for both conventional EBL system and MCC system.
[ { "created": "Tue, 11 Feb 2014 10:37:37 GMT", "version": "v1" } ]
2014-02-12
[ [ "Yu", "Bei", "" ], [ "Yuan", "Kun", "" ], [ "Gao", "Jhih-Rong", "" ], [ "Pan", "David Z.", "" ] ]
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1402.2437
Bartosz Walczak
Tomasz Krawczyk, Bartosz Walczak
On-line approach to off-line coloring problems on graphs with geometric representations
Final version, minor revision
null
10.1007/s00493-016-3414-x
null
cs.DS cs.CG cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The main goal of this paper is to formalize and explore a connection between chromatic properties of graphs with geometric representations and competitive analysis of on-line algorithms, which became apparent after the recent construction of triangle-free geometric intersection graphs with arbitrarily large chromatic number due to Pawlik et al. We show that on-line graph coloring problems give rise to classes of game graphs with a natural geometric interpretation. We use this concept to estimate the chromatic number of graphs with geometric representations by finding, for appropriate simpler graphs, on-line coloring algorithms using few colors or proving that no such algorithms exist. We derive upper and lower bounds on the maximum chromatic number that rectangle overlap graphs, subtree overlap graphs, and interval filament graphs (all of which generalize interval overlap graphs) can have when their clique number is bounded. The bounds are absolute for interval filament graphs and asymptotic of the form $(\log\log n)^{f(\omega)}$ for rectangle and subtree overlap graphs, where $f(\omega)$ is a polynomial function of the clique number and $n$ is the number of vertices. In particular, we provide the first construction of geometric intersection graphs with bounded clique number and with chromatic number asymptotically greater than $\log\log n$. We also introduce a concept of $K_k$-free colorings and show that for some geometric representations, $K_3$-free chromatic number can be bounded in terms of clique number although the ordinary ($K_2$-free) chromatic number cannot. Such a result for segment intersection graphs would imply a well-known conjecture that $k$-quasi-planar geometric graphs have linearly many edges.
[ { "created": "Tue, 11 Feb 2014 10:50:08 GMT", "version": "v1" }, { "created": "Mon, 19 Jan 2015 20:58:57 GMT", "version": "v2" }, { "created": "Tue, 5 Apr 2016 19:08:50 GMT", "version": "v3" }, { "created": "Thu, 29 Dec 2016 16:18:51 GMT", "version": "v4" } ]
2016-12-30
[ [ "Krawczyk", "Tomasz", "" ], [ "Walczak", "Bartosz", "" ] ]
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1402.2438
Romain Peretti
Romain Peretti (INL), Guillaume Gomard (INL), Lo\"ic Lalouat (INL), Christian Seassal (INL, ECL), Emmanuel Drouard (INL, ECL)
Absorption enhancement in photonic crystal thin films by pseudo disordered perturbations
MRS Fall Meeting 2013, Boston : United States (2013)
null
10.1557/opl.2014.123
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The effects resulting from the introduction of a controlled perturbation in a single pattern membrane on its absorption are first studied and then analyzed on the basis of band folding considerations. The interest of this approach for photovoltaic applications is finally demonstrated by overcoming the integrated absorption of an optimized single pattern membrane through the introduction of a proper pseudo disordered perturbation.
[ { "created": "Tue, 11 Feb 2014 10:52:12 GMT", "version": "v1" } ]
2014-02-12
[ [ "Peretti", "Romain", "", "INL" ], [ "Gomard", "Guillaume", "", "INL" ], [ "Lalouat", "Loïc", "", "INL" ], [ "Seassal", "Christian", "", "INL, ECL" ], [ "Drouard", "Emmanuel", "", "INL, ECL" ] ]
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1402.2439
Francois Dubois
Nolwenn Balin (Airbus), Fabien Casenave (CERMICS), Fran\c{c}ois Dubois (LMSSC), Eric Duceau (Airbus), Stefan Duprey (Airbus, IECN), Isabelle Terrasse (Airbus)
Boundary Element and Finite Element Coupling for Aeroacoustics Simulations
25 pages
null
10.1016/j.jcp.2015.03.044
null
physics.comp-ph math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the scattering of acoustic perturbations in a presence of a flow. We suppose that the space can be split into a zone where the flow is uniform and a zone where the flow is potential. In the first zone, we apply a Prandtl-Glauert transformation to recover the Helmholtz equation. The well-known setting of boundary element method for the Helmholtz equation is available. In the second zone, the flow quantities are space dependent, we have to consider a local resolution, namely the finite element method. Herein, we carry out the coupling of these two methods and present various applications and validation test cases. The source term is given through the decomposition of an incident acoustic field on a section of the computational domain's boundary.
[ { "created": "Tue, 11 Feb 2014 10:54:31 GMT", "version": "v1" }, { "created": "Thu, 13 Nov 2014 15:33:45 GMT", "version": "v2" } ]
2015-05-20
[ [ "Balin", "Nolwenn", "", "Airbus" ], [ "Casenave", "Fabien", "", "CERMICS" ], [ "Dubois", "François", "", "LMSSC" ], [ "Duceau", "Eric", "", "Airbus" ], [ "Duprey", "Stefan", "", "Airbus, IECN" ], [ "Terrasse", "Isabelle", "", "Airbus" ] ]
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1402.2440
Regina Ammer
Regina Ammer, Matthias Markl, Vera J\"uchter, Carolin K\"orner, Ulrich R\"ude
Validation Experiments for LBM Simulations of Electron Beam Melting
submitted to "International Journal of Modern Physics C"
null
null
null
cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper validates 3D simulation results of electron beam melting (EBM) processes comparing experimental and numerical data. The physical setup is presented which is discretized by a three dimensional (3D) thermal lattice Boltzmann method (LBM). An experimental process window is used for the validation depending on the line energy injected into the metal powder bed and the scan velocity of the electron beam. In the process window the EBM products are classified into the categories, porous, good and swelling, depending on the quality of the surface. The same parameter sets are used to generate a numerical process window. A comparison of numerical and experimental process windows shows a good agreement. This validates the EBM model and justifies simulations for future improvements of EBM processes. In particular numerical simulations can be used to explain future process window scenarios and find the best parameter set for a good surface quality and dense products.
[ { "created": "Tue, 11 Feb 2014 10:59:00 GMT", "version": "v1" } ]
2014-02-12
[ [ "Ammer", "Regina", "" ], [ "Markl", "Matthias", "" ], [ "Jüchter", "Vera", "" ], [ "Körner", "Carolin", "" ], [ "Rüde", "Ulrich", "" ] ]
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1402.2442
Bei Yu
Jhih-Rong Gao and Bei Yu and Ru Huang and David Z. Pan
Self-Aligned Double Patterning Friendly Configuration for Standard Cell Library Considering Placement
null
null
10.1117/12.2011660
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Self-aligned double patterning (SADP) has become a promising technique to push pattern resolution limit to sub-22nm technology node. Although SADP provides good overlay controllability, it encounters many challenges in physical design stages to obtain conflict-free layout decomposition. In this paper, we study the impact on placement by different standard cell layout decomposition strategies. We propose a SADP friendly standard cell configuration which provides pre-coloring results for standard cells. These configurations are brought into the placement stage to help ensure layout decomposability and save the extra effort for solving conflicts in later stages.
[ { "created": "Tue, 11 Feb 2014 11:02:42 GMT", "version": "v1" } ]
2014-02-12
[ [ "Gao", "Jhih-Rong", "" ], [ "Yu", "Bei", "" ], [ "Huang", "Ru", "" ], [ "Pan", "David Z.", "" ] ]
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1402.2446
Petr Kuznetsov
Zohir Bouzid, Eli Gafni, Petr Kuznetsov
Strong Equivalence Relations for Iterated Models
null
null
null
null
cs.DC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Iterated Immediate Snapshot model (IIS), due to its elegant geometrical representation, has become standard for applying topological reasoning to distributed computing. Its modular structure makes it easier to analyze than the more realistic (non-iterated) read-write Atomic-Snapshot memory model (AS). It is known that AS and IIS are equivalent with respect to \emph{wait-free task} computability: a distributed task is solvable in AS if and only if it solvable in IIS. We observe, however, that this equivalence is not sufficient in order to explore solvability of tasks in \emph{sub-models} of AS (i.e. proper subsets of its runs) or computability of \emph{long-lived} objects, and a stronger equivalence relation is needed. In this paper, we consider \emph{adversarial} sub-models of AS and IIS specified by the sets of processes that can be \emph{correct} in a model run. We show that AS and IIS are equivalent in a strong way: a (possibly long-lived) object is implementable in AS under a given adversary if and only if it is implementable in IIS under the same adversary. %This holds whether the object is one-shot or long-lived. Therefore, the computability of any object in shared memory under an adversarial AS scheduler can be equivalently investigated in IIS.
[ { "created": "Tue, 11 Feb 2014 11:10:39 GMT", "version": "v1" }, { "created": "Tue, 20 May 2014 16:29:29 GMT", "version": "v2" } ]
2014-05-21
[ [ "Bouzid", "Zohir", "" ], [ "Gafni", "Eli", "" ], [ "Kuznetsov", "Petr", "" ] ]
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null
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1402.2447
Niko Br\"ummer
Niko Br\"ummer, Albert Swart and David van Leeuwen
A comparison of linear and non-linear calibrations for speaker recognition
accepted for Odyssey 2014: The Speaker and Language Recognition Workshop
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In recent work on both generative and discriminative score to log-likelihood-ratio calibration, it was shown that linear transforms give good accuracy only for a limited range of operating points. Moreover, these methods required tailoring of the calibration training objective functions in order to target the desired region of best accuracy. Here, we generalize the linear recipes to non-linear ones. We experiment with a non-linear, non-parametric, discriminative PAV solution, as well as parametric, generative, maximum-likelihood solutions that use Gaussian, Student's T and normal-inverse-Gaussian score distributions. Experiments on NIST SRE'12 scores suggest that the non-linear methods provide wider ranges of optimal accuracy and can be trained without having to resort to objective function tailoring.
[ { "created": "Tue, 11 Feb 2014 11:13:51 GMT", "version": "v1" }, { "created": "Wed, 9 Apr 2014 10:49:48 GMT", "version": "v2" } ]
2014-04-10
[ [ "Brümmer", "Niko", "" ], [ "Swart", "Albert", "" ], [ "van Leeuwen", "David", "" ] ]
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1402.2453
Michele Piana
Cristian Toraci, Gabriele Zaccaria, Stefano Ceriani, David Wilson, Marco Fato, Michele Piana
Sliding window and compressive sensing for low-field dynamic magnetic resonance imaging
Submitted to IEEE Transactions on Medical Imaging
null
null
null
cs.CE physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe an acquisition/processing procedure for image reconstruction in dynamic Magnetic Resonance Imaging (MRI). The approach requires sliding window to record a set of trajectories in the k-space, standard regularization to reconstruct an estimate of the object and compressed sensing to recover image residuals. We validated this approach in the case of specific simulated experiments and, in the case of real measurements, we showed that the procedure is reliable even in the case of data acquired by means of a low-field scanner.
[ { "created": "Tue, 11 Feb 2014 11:24:11 GMT", "version": "v1" } ]
2014-02-12
[ [ "Toraci", "Cristian", "" ], [ "Zaccaria", "Gabriele", "" ], [ "Ceriani", "Stefano", "" ], [ "Wilson", "David", "" ], [ "Fato", "Marco", "" ], [ "Piana", "Michele", "" ] ]
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1402.2455
Elias Helou Neto
E. S. Helou, Y. Censor, T.-B. Chen, I-L. Chern, \'A. R. De Pierro, M. Jiang, H. H.-S. Lu
String-Averaging Expectation-Maximization for Maximum Likelihood Estimation in Emission Tomography
null
null
10.1088/0266-5611/30/5/055003
null
physics.med-ph cs.CY math.NA math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the maximum likelihood model in emission tomography and propose a new family of algorithms for its solution, called String-Averaging Expectation-Maximization (SAEM). In the String-Averaging algorithmic regime, the index set of all underlying equations is split into subsets, called "strings," and the algorithm separately proceeds along each string, possibly in parallel. Then, the end-points of all strings are averaged to form the next iterate. SAEM algorithms with several strings presents better practical merits than the classical Row-Action Maximum-Likelihood Algorithm (RAMLA). We present numerical experiments showing the effectiveness of the algorithmic scheme in realistic situations. Performance is evaluated from the computational cost and reconstruction quality viewpoints. A complete convergence theory is also provided.
[ { "created": "Tue, 11 Feb 2014 11:26:34 GMT", "version": "v1" } ]
2019-04-03
[ [ "Helou", "E. S.", "" ], [ "Censor", "Y.", "" ], [ "Chen", "T. -B.", "" ], [ "Chern", "I-L.", "" ], [ "De Pierro", "Á. R.", "" ], [ "Jiang", "M.", "" ], [ "Lu", "H. H. -S.", "" ] ]
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1402.2459
Bei Yu
Bei Yu and Kun Yuan and Boyang Zhang and Duo Ding and David Z. Pan
Layout decomposition for triple patterning lithography
null
null
10.1109/ICCAD.2011.6105297
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As minimum feature size and pitch spacing further decrease, triple patterning lithography (TPL) is a possible 193nm extension along the paradigm of double patterning lithography (DPL). However, there is very little study on TPL layout decomposition. In this paper, we show that TPL layout decomposition is a more difficult problem than that for DPL. We then propose a general integer linear programming formulation for TPL layout decomposition which can simultaneously minimize conflict and stitch numbers. Since ILP has very poor scalability, we propose three acceleration techniques without sacrificing solution quality: independent component computation, layout graph simplification, and bridge computation. For very dense layouts, even with these speedup techniques, ILP formulation may still be too slow. Therefore, we propose a novel vector programming formulation for TPL decomposition, and solve it through effective semidefinite programming (SDP) approximation. Experimental results show that the ILP with acceleration techniques can reduce 82% runtime compared to the baseline ILP. Using SDP based algorithm, the runtime can be further reduced by 42% with some tradeoff in the stitch number (reduced by 7%) and the conflict (9% more). However, for very dense layouts, SDP based algorithm can achieve 140x speed-up even compared with accelerated ILP.
[ { "created": "Tue, 11 Feb 2014 11:36:51 GMT", "version": "v1" } ]
2014-02-12
[ [ "Yu", "Bei", "" ], [ "Yuan", "Kun", "" ], [ "Zhang", "Boyang", "" ], [ "Ding", "Duo", "" ], [ "Pan", "David Z.", "" ] ]
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1402.2460
Bei Yu
Bei Yu and Sheqin Dong and Yuchun Ma and Tao Lin and Yu Wang and Song Chen and Satoshi Goto
Network flow-based simultaneous retiming and slack budgeting for low power design
null
null
10.1109/ASPDAC.2011.5722236
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Low power design has become one of the most significant requirements when CMOS technology entered the nanometer era. Therefore, timing budget is often performed to slow down as many components as possible so that timing slacks can be applied to reduce the power consumption while maintaining the performance of the whole design. Retiming is a procedure that involves the relocation of flip-flops (FFs) across logic gates to achieve faster clocking speed. In this paper we show that the retiming and slack budgeting problem can be formulated to a convex cost dual network flow problem. Both the theoretical analysis and experimental results show the efficiency of our approach which can not only reduce power consumption by 8.9%, but also speedup previous work by 500 times.
[ { "created": "Tue, 11 Feb 2014 11:49:24 GMT", "version": "v1" } ]
2014-02-12
[ [ "Yu", "Bei", "" ], [ "Dong", "Sheqin", "" ], [ "Ma", "Yuchun", "" ], [ "Lin", "Tao", "" ], [ "Wang", "Yu", "" ], [ "Chen", "Song", "" ], [ "Goto", "Satoshi", "" ] ]
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1402.2461
Zhenhua Yu
Zhenhua Yu, Robert J. Baxley, and G. Tong Zhou
Distributions of Upper PAPR and Lower PAPR of OFDM Signals in Visible Light Communications
acceptted by IEEE ICASSP 2014. arXiv admin note: text overlap with arXiv:1304.0193
null
10.1109/ICASSP.2014.6853617
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Orthogonal frequency-division multiplexing (OFDM) in visible light communications (VLC) inherits the disadvantage of high peak-to-average power ratio (PAPR) from OFDM in radio frequency (RF) communications. The upper peak power and lower peak power of real-valued VLC-OFDM signals are both limited by the dynamic constraints of light emitting diodes (LEDs). The efficiency and transmitted electrical power are directly related with the upper PAPR (UPAPR) and lower PAPR (LPAPR) of VLC-OFDM. In this paper, we will derive the complementary cumulative distribution function (CCDF) of UPAPR and LPAPR, and investigate the joint distribution of UPAPR and LPAPR.
[ { "created": "Tue, 11 Feb 2014 11:54:05 GMT", "version": "v1" } ]
2014-07-22
[ [ "Yu", "Zhenhua", "" ], [ "Baxley", "Robert J.", "" ], [ "Zhou", "G. Tong", "" ] ]
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1402.2462
Bei Yu
Bei Yu and Sheqin Dong and Song Chen and Satoshi Goto
Floorplanning and Topology Generation for Application-Specific Network-on-Chip
null
null
10.1109/ASPDAC.2010.5419825
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Network-on-chip (NoC) architectures have been proposed as a promising alternative to classical bus-based communication architectures. In this paper, we propose a two phases framework to solve application-specific NoCs topology generation problem. At floorplanning phase, we carry out partition driven floorplanning. At post-floorplanning phase, a heuristic method and a min-cost max-flow algorithm is used to insert switches and network interfaces. Finally, we allocate paths to minimize power consumption. The experimental results show our algorithm is effective for power saving.
[ { "created": "Tue, 11 Feb 2014 11:57:04 GMT", "version": "v1" } ]
2014-02-12
[ [ "Yu", "Bei", "" ], [ "Dong", "Sheqin", "" ], [ "Chen", "Song", "" ], [ "Goto", "Satoshi", "" ] ]
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1402.2465
Boussaid Ramzi
Ramzi Boussaid
Simulations of high intensity ions beam RFQ Cooler for DESIR SPIRAL 2
null
null
10.1088/1748-0221/9/07/P07009
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The cooling simulation of a high intensity ions beam by a new generation of a buffer gas radio-frequency cooler within the SHIRaC (SPIRAL-2 High Intensity Radiofrequency Cooler) project, installed at the SPIRAL 2/DESIR facility, is presented. Two simulation methods for the cooling process in presence of the space charge effect and the buffer gas diffusion will be studied. The beam properties degradation in terms of the transmission efficienty, the longitudinal spread energy and the transversal emittance by these effects will be discussed. Finally, a comparison in term of transmission between simulated and experimental results for Cs+ ions beam of intensity going up to 1{\mu}A, will be outlined.
[ { "created": "Tue, 11 Feb 2014 12:07:05 GMT", "version": "v1" }, { "created": "Thu, 6 Mar 2014 13:56:27 GMT", "version": "v2" }, { "created": "Sun, 16 Mar 2014 22:38:21 GMT", "version": "v3" } ]
2015-06-18
[ [ "Boussaid", "Ramzi", "" ] ]
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1402.2474
Daniel Weller
Stefan Hetzl and Alexander Leitsch and Giselle Reis and Janos Tapolczai and Daniel Weller
Introducing Quantified Cuts in Logic with Equality
null
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cut-introduction is a technique for structuring and compressing formal proofs. In this paper we generalize our cut-introduction method for the introduction of quantified lemmas of the form $\forall x.A$ (for quantifier-free $A$) to a method generating lemmas of the form $\forall x_1\ldots\forall x_n.A$. Moreover, we extend the original method to predicate logic with equality. The new method was implemented and applied to the TSTP proof database. It is shown that the extension of the method to handle equality and quantifier-blocks leads to a substantial improvement of the old algorithm.
[ { "created": "Tue, 11 Feb 2014 12:42:41 GMT", "version": "v1" } ]
2014-02-12
[ [ "Hetzl", "Stefan", "" ], [ "Leitsch", "Alexander", "" ], [ "Reis", "Giselle", "" ], [ "Tapolczai", "Janos", "" ], [ "Weller", "Daniel", "" ] ]
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1402.2479
Zengfeng Zhang
Zengfeng Zhang, Lingyang Song, Zhu Han, and Walid Saad
Coalitional Games with Overlapping Coalitions for Interference Management in Small Cell Networks
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null
null
null
cs.GT cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study the problem of cooperative interference management in an OFDMA two-tier small cell network. In particular, we propose a novel approach for allowing the small cells to cooperate, so as to optimize their sum-rate, while cooperatively satisfying their maximum transmit power constraints. Unlike existing work which assumes that only disjoint groups of cooperative small cells can emerge, we formulate the small cells' cooperation problem as a coalition formation game with overlapping coalitions. In this game, each small cell base station can choose to participate in one or more cooperative groups (or coalitions) simultaneously, so as to optimize the tradeoff between the benefits and costs associated with cooperation. We study the properties of the proposed overlapping coalition formation game and we show that it exhibits negative externalities due to interference. Then, we propose a novel decentralized algorithm that allows the small cell base stations to interact and self-organize into a stable overlapping coalitional structure. Simulation results show that the proposed algorithm results in a notable performance advantage in terms of the total system sum-rate, relative to the noncooperative case and the classical algorithms for coalitional games with non-overlapping coalitions.
[ { "created": "Tue, 11 Feb 2014 13:03:54 GMT", "version": "v1" } ]
2014-02-12
[ [ "Zhang", "Zengfeng", "" ], [ "Song", "Lingyang", "" ], [ "Han", "Zhu", "" ], [ "Saad", "Walid", "" ] ]
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1402.2482
Manuel Cebrian
Yury Kryvasheyeu, Haohui Chen, Esteban Moro, Pascal Van Hentenryck, Manuel Cebrian
Performance of Social Network Sensors During Hurricane Sandy
null
null
10.1371/journal.pone.0117288
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Information flow during catastrophic events is a critical aspect of disaster management. Modern communication platforms, in particular online social networks, provide an opportunity to study such flow, and a mean to derive early-warning sensors, improving emergency preparedness and response. Performance of the social networks sensor method, based on topological and behavioural properties derived from the "friendship paradox", is studied here for over 50 million Twitter messages posted before, during, and after Hurricane Sandy. We find that differences in user's network centrality effectively translate into moderate awareness advantage (up to 26 hours); and that geo-location of users within or outside of the hurricane-affected area plays significant role in determining the scale of such advantage. Emotional response appears to be universal regardless of the position in the network topology, and displays characteristic, easily detectable patterns, opening a possibility of implementing a simple "sentiment sensing" technique to detect and locate disasters.
[ { "created": "Tue, 11 Feb 2014 13:09:21 GMT", "version": "v1" }, { "created": "Fri, 20 Jun 2014 15:21:55 GMT", "version": "v2" } ]
2015-06-18
[ [ "Kryvasheyeu", "Yury", "" ], [ "Chen", "Haohui", "" ], [ "Moro", "Esteban", "" ], [ "Van Hentenryck", "Pascal", "" ], [ "Cebrian", "Manuel", "" ] ]
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1402.2487
Soumya Sen
Partha Ghosh, Soumya Sen
Materialized View Replacement using Markovs Analysis
null
null
null
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Materialized view is used in large data centric applications to expedite query processing. The efficiency of materialized view depends on degree of result found against the queries over the existing materialized views. Materialized views are constructed following different methodologies. Thus the efficacy of the materialized views depends on the methodology based on which these are formed. Construction of materialized views are often time consuming and moreover after a certain time the performance of the materialized views degrade when the nature of queries change. In this situation either new materialized views could be constructed from scratch or the existing views could be upgraded. Fresh construction of materialized views has higher time complexity hence the modification of the existing views is a better solution.Modification process of materialized view is classified under materialized view maintenance scheme. Materialized view maintenance is a continuous process and the system could be tuned to ensure a constant rate of performance. If a materialized view construction process is not supported by materialized view maintenance scheme that system would suffer from performance degradation. In this paper a new materialized view maintenance scheme is proposed using markovs analysis to ensure consistent performance. Markovs analysis is chosen here to predict steady state probability over initial probability.
[ { "created": "Tue, 11 Feb 2014 13:46:30 GMT", "version": "v1" } ]
2014-02-12
[ [ "Ghosh", "Partha", "" ], [ "Sen", "Soumya", "" ] ]
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1402.2489
Yingjie Zhou
Yingjie Zhou, Nicholas Maxemchuk, Xiangying Qian, Chen Wang
The Fair Distribution of Power to Electric Vehicles: An Alternative to Pricing
accepted in IEEE Smartgridcomm'14
null
10.1109/SmartGridComm.2014.7007727
null
cs.NI cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As the popularity of electric vehicles increases, the demand for more power can increase more rapidly than our ability to install additional generating capacity. In the long term we expect that the supply and demand will become balanced. However, in the interim the rate at which electric vehicles can be deployed will depend on our ability to charge these vehicles without inconveniencing their owners. In this paper, we investigate using fairness mechanisms to distribute power to electric vehicles on a smart grid. We assume that during peak demand there is insufficient power to charge all the vehicles simultaneously. In each five minute interval of time we select a subset of the vehicles to charge, based upon information about the vehicles. We evaluate the selection mechanisms using published data on the current demand for electric power as a function of time of day, current driving habits for commuting, and the current rates at which electric vehicles can be charged on home outlets. We found that conventional selection strategies, such as first-come-first-served or round robin, may delay a significant fraction of the vehicles by more than two hours, even when the total available power over the course of a day is two or three times the power required by the vehicles. However, a selection mechanism that minimizes the maximum delay can reduce the delays to a few minutes, even when the capacity available for charging electric vehicles exceeds their requirements by as little as 5%.
[ { "created": "Tue, 11 Feb 2014 14:06:36 GMT", "version": "v1" }, { "created": "Wed, 30 Jul 2014 01:30:44 GMT", "version": "v2" } ]
2016-11-15
[ [ "Zhou", "Yingjie", "" ], [ "Maxemchuk", "Nicholas", "" ], [ "Qian", "Xiangying", "" ], [ "Wang", "Chen", "" ] ]
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1402.2490
Mario Rodr\'iguez-Mart\'inez MRM
Mario Rodr\'iguez-Mart\'inez, H. Rom\'an P\'erez-Enr\'iquez, Armando Carrillo-Vargas, Rebeca L\'opez-Montes, Eduardo A. Araujo-Pradere, Gilberto A. Casillas-P\'erez, Jos\'e A. L. Cruz-Abeyro
Ionospheric Disturbances and their Impact on IPS Using MEXART Observations
20 pages, 10 figures. Accepted for publication in Solar Physics, Springer
null
10.1007/s11207-014-0496-8
null
physics.space-ph astro-ph.SR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the impact of ionospheric disturbances on the Earth's environment caused by the solar events that occurred from 20 April to 31 May 2010, using observations from the Mexican Array Radio Telescope (MEXART). During this period of time, several astronomical sources presented fluctuations in their radio signals. Wavelet analysis, together with complementary information such as the vertical total electron content (vTEC) and the Dst index, were used to identify and understand when the interplanetary scintillation (IPS) could be contaminated by ionospheric disturbances (IOND). We find that radio signal perturbations were sometimes associated with IOND and/or IPS fluctuations; however, in some cases, it was not possible to clearly identify their origin. Our Fourier and wavelet analyses showed that these fluctuations had frequencies in the range $\approx$ 0.01 Hz -- $\approx$ 1.0 Hz (periodicities of 100 s to 1 s).
[ { "created": "Tue, 11 Feb 2014 14:06:55 GMT", "version": "v1" } ]
2014-02-12
[ [ "Rodríguez-Martínez", "Mario", "" ], [ "Pérez-Enríquez", "H. Román", "" ], [ "Carrillo-Vargas", "Armando", "" ], [ "López-Montes", "Rebeca", "" ], [ "Araujo-Pradere", "Eduardo A.", "" ], [ "Casillas-Pérez", "Gilberto A.", "" ], [ "Cruz-Abeyro", "José A. L.", "" ] ]
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1402.2491
Uthaya Banu
M.Uthaya Banu, K.Saravanan
Optimizing the Cost for Resource Subscription Policy in IaaS Cloud
6 pages,8 figures,"Published with International Journal of Engineering Trends and Technology (IJETT)". M.Uthaya Banu, K.Saravanan. Article:Optimizing the Cost for Resource Subscription Policy in IaaS Cloud
International Journal of Engineering Trends and Technology (IJETT) 6(6):296-301, December 2013
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null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cloud computing allow the users to efficiently and dynamically provision computing resource to meet their IT needs. Cloud Provider offers two subscription plan to the customer namely reservation and on-demand. The reservation plan is typically cheaper than on-demand plan. If the actual computing demand is known in advance reserving the resource would be straightforward. The challenge is how to make properly resource provisioning and how the customers efficiently purchase the provisioning options under reservation and on-demand. To address this issue, two-phase algorithm are proposed to minimize service provision cost in both reservation and on-demand plan. To reserve the correct and optimal amount of resources during reservation, proposed a mathematical formulae in the first phase. To predict resource demand, use kalman filter in the second phase. The evaluation result shows that the two-phase algorithm can significantly reduce the provision cost and the prediction is of reasonable accuracy.
[ { "created": "Tue, 11 Feb 2014 14:11:18 GMT", "version": "v1" } ]
2014-02-12
[ [ "Banu", "M. Uthaya", "" ], [ "Saravanan", "K.", "" ] ]
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1402.2494
Ludvig Bohlin
Ludvig Bohlin and Martin Rosvall
Stock portfolio structure of individual investors infers future trading behavior
9 pages, 4 figures, 1 table
PLoS ONE (2014) 9(7): e103006
10.1371/journal.pone.0103006
null
q-fin.GN physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Although the understanding of and motivation behind individual trading behavior is an important puzzle in finance, little is known about the connection between an investor's portfolio structure and her trading behavior in practice. In this paper, we investigate the relation between what stocks investors hold, and what stocks they buy, and show that investors with similar portfolio structures to a great extent trade in a similar way. With data from the central register of shareholdings in Sweden, we model the market in a similarity network, by considering investors as nodes, connected with links representing portfolio similarity. From the network, we find groups of investors that not only identify different investment strategies, but also represent groups of individual investors trading in a similar way. These findings suggest that the stock portfolios of investors hold meaningful information, which could be used to earn a better understanding of stock market dynamics.
[ { "created": "Tue, 11 Feb 2014 14:16:05 GMT", "version": "v1" }, { "created": "Thu, 28 Aug 2014 14:18:58 GMT", "version": "v2" } ]
2014-08-29
[ [ "Bohlin", "Ludvig", "" ], [ "Rosvall", "Martin", "" ] ]
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1402.2496
Pierre Fraigniaud
L\'elia Blin and Pierre Fraigniaud
Polynomial-Time Space-Optimal Silent Self-Stabilizing Minimum-Degree Spanning Tree Construction
null
null
null
null
cs.DC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by applications to sensor networks, as well as to many other areas, this paper studies the construction of minimum-degree spanning trees. We consider the classical node-register state model, with a weakly fair scheduler, and we present a space-optimal \emph{silent} self-stabilizing construction of minimum-degree spanning trees in this model. Computing a spanning tree with minimum degree is NP-hard. Therefore, we actually focus on constructing a spanning tree whose degree is within one from the optimal. Our algorithm uses registers on $O(\log n)$ bits, converges in a polynomial number of rounds, and performs polynomial-time computation at each node. Specifically, the algorithm constructs and stabilizes on a special class of spanning trees, with degree at most $OPT+1$. Indeed, we prove that, unless NP $=$ coNP, there are no proof-labeling schemes involving polynomial-time computation at each node for the whole family of spanning trees with degree at most $OPT+1$. Up to our knowledge, this is the first example of the design of a compact silent self-stabilizing algorithm constructing, and stabilizing on a subset of optimal solutions to a natural problem for which there are no time-efficient proof-labeling schemes. On our way to design our algorithm, we establish a set of independent results that may have interest on their own. In particular, we describe a new space-optimal silent self-stabilizing spanning tree construction, stabilizing on \emph{any} spanning tree, in $O(n)$ rounds, and using just \emph{one} additional bit compared to the size of the labels used to certify trees. We also design a silent loop-free self-stabilizing algorithm for transforming a tree into another tree. Last but not least, we provide a silent self-stabilizing algorithm for computing and certifying the labels of a NCA-labeling scheme.
[ { "created": "Tue, 11 Feb 2014 14:19:00 GMT", "version": "v1" } ]
2014-02-12
[ [ "Blin", "Lélia", "" ], [ "Fraigniaud", "Pierre", "" ] ]
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1402.2507
Matteo Lasagni
Matteo Lasagni and Kay R\"omer
Force-Guiding Particle Chains for Shape-Shifting Displays
6 pages, 5 figure, submitted to IROS 2014
null
null
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present design and implementation of a chain of particles that can be programmed to fold the chain into a given curve. The particles guide an external force to fold, therefore the particles are simple and amenable for miniaturization. A chain can consist of a large number of such particles. Using multiple of these chains, a shape-shifting display can be constructed that folds its initially flat surface to approximate a given 3D shape that can be touched and modified by users, for example, enabling architects to interactively view, touch, and modify a 3D model of a building.
[ { "created": "Tue, 11 Feb 2014 14:43:53 GMT", "version": "v1" } ]
2014-02-12
[ [ "Lasagni", "Matteo", "" ], [ "Römer", "Kay", "" ] ]
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