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On the use of genetic algorithms for solving the RWA problem employing the maximum quantity of edge disjoint paths

On the use of genetic algorithms for solving the RWA problem...

引用

International Conference on Transparent Optical Networks

作者： Demetris Monoyios Kyriakos Vlachos Computer Engineering and Informatics Department & Research Academic Computer Technology Institute University of Patras Rio Greece

In this paper, the routing and wavelength assignment problem in all optical networks is considered. A solution to the RWA problem is proposed through a Genetic Algorithm (GA) based approach to search for the most suitable set of paths from many possible ones. We use GAs to solve this problem by introducing a new fitness function based on the mean value of occurrence of the common edges between the different genes of a single chromosome. In addition, we further improve performance and particularly execution times by considering the maximum quantity of edge disjoint paths (EDPs) to initialize the population with some indigo chromosomes. These EDPs are pre-computed and inserted in the GA-RWA problem. The proposed approach has been evaluated on the NSF network topology and compared with other similar schemes.

关键词： Biological cells Genetic algorithms Routing Optical fiber networks Integrated optics Gallium Wavelength assignment

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An adaptive burst assembly scheme for OBS-GRID networks

An adaptive burst assembly scheme for OBS-GRID networks

引用

International Symposium on Communication Systems, Networks and Digital Signal Processing, CNSDSP

作者： Nikos Korkakakis Kyriakos Vlachos Research Academic Computer Technology Institute and Computer Engineering and Informatics Department University of Patras Patras Greece

This paper addresses the problem of burst assembly in OBS-GRID networks and particularly the TCP throughput maximization problem for large file sizes. For that purpose, a novel adaptive size-based approach is proposed, following some probabilistic methods and considering the effect of the burstification process in the overall transport system. The scheme has been evaluated in a high capacity GRID network. It was found that the proposed scheme results in shorter file transfer times, a significant higher TCP throughout, thus yielding a positive impact at the grid mechanics. The performance of the scheme is compared to that of a timer-based algorithm.

关键词： Assembly Adaptation model Delay Approximation algorithms Optical fiber networks Heuristic algorithms Algorithm design and analysis

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Gait authentication using distributed source coding

Gait authentication using distributed source coding

引用

2008 IEEE International Conference on Image Processing, ICIP 2008

作者： Argyropoulos, S. Tzovaras, D. Ioannidis, D. Strintzis, M.G. Dept. of Electrical and Computer Engineering Aristotle University of Thessaloniki Thessaloniki GR-54124 Hellas Greece Informatics and Telematics Institute Centre for Research and Technology Hellas Thermi-Thessaloniki GR-57001 Hellas Greece

ISBN: (纸本)1424417643

A novel gait authentication scheme based on distributed source coding principles is proposed. Biometric recognition is formulated as a coding problem with noisy side information at the decoder and error correcting codes are employed for user authentication. The effective exploitation of the noise channel statistics in the decoding process improves performance. It is also shown that the proposed method increases the security of the stored biometric templates. Gait recognition is based on the extraction of dept. data from human silhouettes and a set of discriminative features. The experimental results demonstrate the validity of the proposed method. © 2008 IEEE.

关键词： Channel coding

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Evaluation of different radio bearer selection approaches for MBMS in B3G networks

Evaluation of different radio bearer selection approaches fo...

引用

IFIP Wireless Days, WD

作者： Antonios Alexiou Christos Bouras Vasileios Kokkinos Evangelos Rekkas Research Academic Computer Technology Institute Patras Greece and Computer Engineering and Informatics Department University of Patras Greece

The spread of multimedia data has drastically differentiated the current landscape of Universal Mobile Telecommunication System (UMTS) networks, posing the need for further enhancements in its Radio Resource Management (RRM) strategies. Introduced in 3rd Generation Partnership Project (3 GPP) Release 6, the Multimedia Broadcast/Multicast Services (MBMS) framework aims at the efficient usage of network and radio resources for the transmission of multimedia services. The main requirement during the provision of MBMS multicast services is to minimize the transmission power of UMTS base stations. To this direction, several mechanisms have been proposed that either allow a simultaneous deployment of Point-to-Point (PTP) and Point-to-Multipoint (PTM) transmissions, or a single transport channel deployment (PTP or PTM) in a cell at any given time. Main objective of this paper is to study these mechanisms, compare them in terms of power consumption, underline the advantages that they may offer; and finally to propose enhancements that will ensure the lowest possible power consumption during MBMS transmissions.

关键词： 3G mobile communication Power control Energy consumption computer networks Telecommunication computing Digital multimedia broadcasting Base stations Data engineering informatics Multimedia systems

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Avoiding adjacent channel interference in static RWA

Avoiding adjacent channel interference in static RWA

引用

International Symposium on Communication Systems, Networks and Digital Signal Processing, CNSDSP

作者： K. Manousakis K. Christodoulopoulos E. Varvarigos Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patras Greece

We design and implement an algorithm for solving the static RWA problem based on an LP relaxation formulation. This formulation is capable of providing integer optimal solutions despite the absence of integrality constraints for a large subset of RWA input instances. In static RWA there is no a-priori knowledge of the channels usage and the interference among them cannot be avoided once the solution has been found. To take into consideration adjacent channel interference, we extend our formulation and model the interference by a set of analytical formulas as additional constraints on RWA.

关键词： Interference Optical fiber networks Interchannel interference Routing Wavelength assignment Wavelength division multiplexing Modulation

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Comparison of Routing and Wavelength Assignment Algorithms in WDM Networks

Comparison of Routing and Wavelength Assignment Algorithms i...

引用

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： K. Christodoulopoulos K. Manousakis E. Varvarigos Computer Engineering and Informatics Department Greece Research Academic Computer Technology Institute University of Patras Patras Greece

We design and implement various algorithms for solving the static RWA problem with the objective of minimizing the maximum number of requested wavelengths based on LP relaxation formulations. We present a link formulation, a path formulation and a heuristic that breaks the problem in the two constituent subproblems and solves them individually and sequentially. The flow cost functions that are used in these formulations result in providing integer optimal solutions despite the absence of integrality constraints for a large subset of RWA input instances, while also minimizing the total number of used wavelengths. We present a random perturbation technique that is shown to increase the number of instances for which we find integer solutions, and we also present appropriate iterative fixing and rounding methods to be used when the algorithms do not yield integer solutions. We comment on the number of variables and constraints these formulations require and perform extensive simulations to compare their performance to that of a typical min-max congestion formulation.

关键词： Wavelength routing Wavelength assignment WDM networks Telecommunication traffic Wavelength division multiplexing Optical fiber networks Optical fiber communication computer networks Algorithm design and analysis Cost function

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Adaptive manager-side control policy in contract net protocol for massively multi-agent systems

Adaptive manager-side control policy in contract net protoco...

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7th International Joint Conference on Autonomous Agents and Multiagent Systems, AAMAS 2008

作者： Sugawara, Toshiharu Kurihara, Satoshi Hirotsu, Toshio Fukuda, Kensuke Dept. of Computer Science and Engineering Waseda University Tokyo 1698555 Japan Inst. of Scientific and Industrial Research Osaka University Japan Dept. of Information and Computer Sciences Toyohashi University of Technology Toyohashi Aichi 441-8580 Japan National Institute of Informatics Chiyoda Tokyo 100-000 Japan

ISBN: (纸本)9781605604701

We describe a new adaptive manager-side control policy for the contract net protocol for a massively multi-agent system (MMAS). To improve overall performance of MMAS, tasks must be allocated to appropriate agents. From this viewpoint, a number of negotiation protocols were proposed in the MAS context, but most assume a small-scale, unbusy environment. We previously reported that, using contract net protocol (CNP), the overall efficiency could improve by an adequate control of degree of fluctuation in the awarding phase depending on the state of MMAS. In this paper, we propose the method to estimate these states from the bid values, which have hitherto not been used effectively. Then the manager-side policy flexibly and autonomously with some degree of fluctuation responsive to the estimated states is introduced. We also evaluate that our proposed CNP policy. Copyright © 2008. International Foundation for Autonomous Agents and Multiagent Systems. All rights reserved.

关键词： Multi agent systems

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Efficient Assignment of Multiple MBMS Sessions in B3G Networks

Efficient Assignment of Multiple MBMS Sessions in B3G Networ...

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IEEE Conference on Vehicular technology (VTC)

作者： Antonios Alexiou Christos Bouras Vasileios Kokkinos Evangelos Rekkas Computer Engineering and Informatics Dept Univ. of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece Computer Engineering and Informatics Dept Univ. of Patras Greece

In Universal Mobile Telecommunication System (UMTS), the downlink capacity is limited by the base station transmission power. Therefore, power control plays an important role to minimize the transmitted power shared among unicast and multicast users within a cell. In Multimedia Broadcast/Multicast Service (MBMS), power control targets to the efficient utilization of radio and network resources. However, the expected high demand for such services stresses the need for an efficient scheme, capable of dynamically allocating radio resources to parallel MBMS sessions. This paper proposes a power control mechanism for efficient MBMS session assignment in next generation UMTS networks. The mechanism shares efficiently the available power resources of UMTS base stations to MBMS sessions running in the network Furthermore, the mechanism is evaluated through several realistic scenarios and the results indicate the ability of the mechanism to utilize efficiently the radio resources and to ensure the service continuity when parallel MBMS services running in the network.

关键词： 3G mobile communication Power control Base stations computer architecture Microprocessors Interference Mobile communication

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Routing and scheduling in grids

Routing and scheduling in grids

引用

International Conference on Transparent Optical Networks

作者： Konstantinos Christodoulopoulos Emmanouel Varvarigos Computer Engineering and Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

We propose QoS-aware scheduling algorithms for grid networks that are capable of optimally or near-optimally assigning computation and communication tasks to grid resources. The routing and scheduling algorithms to be presented take as input the resource utilization profiles and the task characteristics and QoS requirements, and co-allocate resources while accounting for the dependencies between communication and computation tasks.

关键词： Availability Processor scheduling Clustering algorithms Routing Heuristic algorithms Quality of service Delay

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A trusted architectural model for interconnecting testbeds of wireless sensor networks

A trusted architectural model for interconnecting testbeds o...

引用

International Symposium on Electronics in Marine (ELMAR)

作者： Ioannis Chatzigiannakis Vasiliki Liagkou Paul G. Spirakis Department of Computer Engineering and Informatics University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

ISBN: (纸本)9781424433643

Designing wireless sensor networks is inherently complex; many aspects such as energy efficiency, limited resources, decentralized collaboration, fault tolerance have to be tackled. To be effective and to produce applicable results, fundamental research has to be tested, at least as a proof-of-concept, in large scale environments, so as to assess the feasibility of the new concepts, verb their large scale effects (not only at technological level, but also as for their foreseeable implications on users, society and economy) and derive further requirements, orientations and inputs for the research. In this paper we focus on the problems of interconnecting existing testbed environments via the Internet and providing a virtual unifying laboratory that will support academia, research centers and industry in their research on networks and services. In such a facility important issues of trust, security, confidentiality and integrity of data may arise especially for commercial (or not) organizations. In this paper we investigate such issues and present the design of a secure and robust architectural model for interconnecting testbeds of wireless sensor networks.

关键词： Testing Wireless sensor networks Large-scale systems Energy efficiency Collaboration Fault tolerance IP networks Web and internet services Data security Robustness

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