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International Conference on computer and Information Science (ACIS)

作者： Neeraj Nehra R. B. Patel V. K. Bhat School of Computer Science and Engineering SMVDU University Katra Jammu and Kashmir India Computer Engineering Department M. M. Engineering College Ambala Haryana India School of Applied Physics and Mathematics SMVDU University Katra Jammu and Kashmir India

An ad hoc wireless mobile network is an infrastructure-less network that has no fixed routes; instead, all nodes are capable of movement and can be connected dynamically in an arbitrary manner. In order to facilitate communication of mobile nodes that may not be within the wireless range of each other, an efficient routing protocol is needed to discover routes between nodes so that messages may be delivered in a timely manner. Therefore in this paper, we propose routing with load balancing using mobile agent (RLBMA). We use the concept of mobile agent (MA) for route discovery and balance the traffic load on the route. This MA selects the disjoint (alternate) path called active path set (APS) for reliable transmission to avoid congestion. RLBMA provides topology updation and path maintenance also. A comprehensive simulation study was conducted to evaluate the performance of the proposed scheme. Performance results shows that MA approach outperforms existing ad hoc routing protocols in terms of packet delivery fraction, average end-to-end delay and normalized routing load.

关键词： Load management Ad hoc networks Mobile agents Routing protocols Mobile communication Samarium Mobile computing Telecommunication traffic Delay Mobile ad hoc networks

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Approximating the largest eigenvalue of network adjacency matrices

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Physical Review E 2007年第5期76卷 056119-056119页

作者： Juan G. Restrepo Edward Ott Brian R. Hunt Center for Interdisciplinary Research in Complex Systems Northeastern University Boston Massachusetts 02115 USA Department of Physics Department of Electrical and Computer Engineering and Institute for Research in Electronics and Applied Physics University of Maryland College Park Maryland 20742 USA Department of Mathematics and Institute for Physical Science and Technology University of Maryland College Park Maryland 20742 USA

The largest eigenvalue of the adjacency matrix of a network plays an important role in several network processes (e.g., synchronization of oscillators, percolation on directed networks, and linear stability of equilibria of network coupled systems). In this paper we develop approximations to the largest eigenvalue of adjacency matrices and discuss the relationships between these approximations. Numerical experiments on simulated networks are used to test our results.

关键词： COMPLEX NETWORKS RANDOM GRAPHS

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Calculation of energy-deposition distributions of a ⁹C beam using the PHITS code

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Journal of Physics: Conference Series 2007年第1期74卷 021011-021011页

作者： Mancusi, Davide Sihver, Lembit Niita, Koji Li, Qiang Sato, Tatsuhiko Iwase, Hiroshi Iwamoto, Yosuke Matsuda, Norihiro Sakamoto, Yukio Nakashima, Hiroshi Nuclear Engineering Applied Physics Chalmers University of Technology Gothenburg Sweden Department of Mathematics Computer Science and Physics Roanoke College Salem VA United States Research Organisation for Information Science and Technology Tokai-mura Japan Institute of Modern Physics Chinese Academy of Sciences Lanzhou China Japan Atomic Energy Agency Tokai-mura Japan Radiation Science KEK 305-0801 Tsukuba Oho 1 Japan

Carbon-9 beams represent one of the possible alternatives (presently under consideration and investigation) to conventional 12C beams for heavy-ion cancer treatment. Interest in this exotic isotope stems from the expe...

Carbon-9 beams represent one of the possible alternatives (presently under consideration and investigation) to conventional ¹²C beams for heavy-ion cancer treatment. Interest in this exotic isotope stems from the expected boost in biological effectiveness due to the β-delayed emission of two α particles and a proton that takes place at the ion stopping site. Experiments have been performed [1] to characterise ⁹C beams physically and models have been developed [2] to estimate quantitatively its biological effect. In this work, we have used the PHITS code [3] to calculate energy-deposition and LET distributions for a ⁹C beam in water and we have compared the results with some published data [1]. Even though PHITS fails to reproduce some of the features of the distributions, its result is that decay gives a negligible contribution to the energy-deposition distributions, thus contradicting the previous interpretation of the measured data © 2007 IOP Publishing Ltd.

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Novel perspectives oil low frequency scattering

Novel perspectives oil low frequency scattering

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Complex Photonic Media

作者： McCall, Martin W. Venkov, George Censor, Dan Department of Physics Blackett Laboratory Imperial College of Science Technology and Medicine Prince Consort Road London SW7 2BZ United Kingdom Department of Applied Mathematics and Informatics Technical University of Sofia 1756 Sofia Bulgaria Department of Electrical and Computer Engineering Ben-Gurion University of the Negev 84105 Beer-Sheva Israel

ISBN: (纸本)081946399X

We re-examine some the assumptions underlying low frequency scattering of electromagnetic waves. We find an inconsistency in the basic field expansions, and propose a new ansatz through which the inconsistency is addressed. We illustrate by comparing the two methods for scattering of plane waves by a perfectly conducting cylinder, for which the exact solution is known.

关键词： Electromagnetic wave scattering

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A Multi-Agent system for Distributed Dynamic Load Balancing on Cluster

A Multi-Agent system for Distributed Dynamic Load Balancing ...

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International Conference on Advanced Computing and Communications (ADCOM)

作者： Neeraj Nehra R.B. Patel V.K. Bhat School of Computer Science and Engineering Shri Mata Vaishno Devi University Katra India Computer Engineering Department M.M. Engineering College Haryana India School of Applied physics and Mathematics Shri Mata Vaishno Devi University Katra India

Dynamic load balancing (DLB) is an important system function destined to distribute workload among participating nodes to improve throughput and/or execution times of parallel computers. Instead of balancing the load in cluster by process migration, or by moving an entire process to a less loaded computer, we make an attempt to balance load by splitting processes into separate jobs and then balance them among nodes. In order to get target, we use mobile agent (MA) to distribute load among nodes in a cluster. In this paper, distributed dynamic load balancing using MA (DDLBMA) technique is presented. We introduce types of agents needed to meet the requirements of the proposed load balancing. Different metrics are used to compare load balancing mechanism with the existing technology. The experiment is carried out on cluster of PC's divided into multiple local area network (LAN) using mobile agent system PMADE (Platform for Mobile agent distribution and execution). Preliminary experimental results demonstrated that the proposed technique is effective.

关键词： Multiagent systems Load management Mobile agents Distributed computing Delay Throughput Local area networks Telecommunication traffic Traffic control Quality of service

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Scale Dependence of Branching in Arterial and Bronchial Trees

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Physical Review Letters 2006年第12期96卷 128101-128101页

作者： Juan G. Restrepo Edward Ott Brian R. Hunt Institute for Research in Electronics and Applied Physics University of Maryland College Park Maryland 20742 USA Department of Mathematics University of Maryland College Park Maryland 20742 USA Department of Physics and Department of Electrical and Computer Engineering University of Maryland College Park Maryland 20742 USA Institute for Physical Science and Technology University of Maryland College Park Maryland 20742 USA

Although models of branching in arterial and bronchial trees often predict a dependence of bifurcation parameters on the scale of the bifurcating vessels, direct verification of this dependence by comparison with data is uncommon. We compare measurements of bifurcation parameters of airways and arterial trees of different mammals as a function of scale to general features predicted by theoretical models based on minimization of pumping power and network volume. We find that the size dependence is more complex than existing theories based solely on energy and volume minimization explain, and suggest additional factors that may govern the branching at different scales.

关键词： .pumping Vessels PRL week Theoretical models bifurcation parameters BRONCHIAL Maryland USA arterial trees

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Emergence of Coherence in Complex Networks of Heterogeneous Dynamical Systems

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Physical Review Letters 2006年第25期96卷 254103-254103页

We present a general theory for the onset of coherence in collections of heterogeneous maps interacting via a complex connection network. Our method allows the dynamics of the individual uncoupled systems to be either chaotic or periodic, and applies generally to networks for which the number of connections per node is large. We find that the critical coupling strength at which a transition to synchrony takes place depends separately on the dynamics of the individual uncoupled systems and on the largest eigenvalue of the adjacency matrix of the coupling network. Our theory directly generalizes the Kuramoto model of equal strength all-to-all coupled phase oscillators to the case of oscillators with more realistic dynamics coupled via a large heterogeneous network.

关键词： .week ending dynamical systems oscillators coherence per node critical coupling All-to-All Kuramoto Model Maryland USA transition to synchrony

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Characterizing the Dynamical Importance of Network Nodes and Links

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Physical Review Letters 2006年第9期97卷 094102-094102页

The largest eigenvalue of the adjacency matrix of networks is a key quantity determining several important dynamical processes on complex networks. Based on this fact, we present a quantitative, objective characterization of the dynamical importance of network nodes and links in terms of their effect on the largest eigenvalue. We show how our characterization of the dynamical importance of nodes can be affected by degree-degree correlations and network community structure. We discuss how our characterization can be used to optimize techniques for controlling certain network dynamical processes and apply our results to real networks.

关键词： .week ending largest eigenvalue network nodes dynamical processes Maryland USA Dynamical Importance importance of nodes

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Exponential Stability for Cellular Neural Networks with Delay

Exponential Stability for Cellular Neural Networks with Dela...

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13th IEEE International Conference on Electronics, Circuits and Systems (ICECS'2006), vol.3

作者： Jinxiang Yang Shouming Zhong Xingwen Liu College of Computer Science and Technology Southwest University of Nationalities of China Chengdu China School of Applied Mathematics University of Electronic Science and Technology Chengdu China College of Electrical Information Engineering Southwest University of Nationalities of China Chengdu China

This paper investigates the exponential stability of a class of delayed cellular neural networks (DCNN's). By means of appropriately dividing the network state variables into several subgroups, the new sufficient exponential stability condition is derived by constructing Liapunov functional and using the method of the variation of constant. The condition suitable is associated with some initial values and is represented only by some blocks of the interconnection matrix. An example is discussed to illustrate the results.

关键词： Stability Cellular neural networks Delay Symmetric matrices Educational institutions Sufficient conditions State feedback computer science mathematics Integrated circuit interconnections

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Collective excitations of a Bose-Einstein condensate in an anharmonic trap

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Physical Review A 2006年第5期74卷 055601-055601页

作者： Guan-Qiang Li Li-Bin Fu Ju-Kui Xue Xu-Zong Chen Jie Liu Institute of Applied Physics and Computational Mathematics P. O. Box 8009 (28) 100088 Beijing People’s Republic of China Physics and Electronics Engineering College Northwest Normal University 730070 Lanzhou People’s Republic of China Key Laboratory for Quantum Information and Measurements Ministry of Education School of Electronics Engineering and Computer Science Peking University Beijing 100871 People’s Republic of China

We investigate the collective excitations of a one-dimensional Bose-Einstein condensate with repulsive interaction between atoms in a quadratic plus quartic trap. Using variational approaches, the coupled equations of motions for the center-of-mass coordinate of the condensate and its width are derived. Then, two low-energy excitation modes are obtained analytically. The frequency shift induced by the anharmonic distortion, and the collapse and revival of the collective excitations originating from the nonlinear coupling between the two modes, are discussed.

关键词： NONLINEAR DYNAMICS GAS

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