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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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System's Design and Implementation for Easy Creation of Mobile Commerce Systems

System's Design and Implementation for Easy Creation of Mobi...

引用

International Conference on Internet and Web Applications and Services (ICIW)

作者： John Garofalakis Flora Oikonomou Vasilios Stefanis Computer Engineering and Informatics Department University of Patras Greece Academic Computer Technology Institute Patras Greece

Mobile commerce (m-commerce) is a rather new field in the business world. It depends on wireless networks for accessing the Internet from mobile devices and for exchanging data between such devices. Wireless technologies on the one hand evolve rapidly and are met in many different applications. On the other hand a plethora of factors encourage market to make advances towards the m-commerce market. New ideas about m-commerce services and applications find acceptance by the business world and by users. Unfortunately not all users know how to create m-commerce services and applications. Thus a system which can easily create mobile commerce systems can be proved very helpful. In this paper we present a system which can create other m-commerce systems in a user friendly way. The system is meant to be used in the m-commerce market as a mean of developing hotel Websites and mobile sites. It uses a simple form which guides the user to create fully functional websites and mobile sites. We focus on implementation issues and evaluate our system after testing it. Finally, conclusions are extracted and future work is proposed.

关键词： Business Mobile computing IP networks Web and internet services Companies computer networks Consumer electronics Mobile handsets Bandwidth Cellular phones

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Extension and evaluation of JXTA protocols for supporting reliable P2P distributed computing

Extension and evaluation of JXTA protocols for supporting re...

引用

作者： Xhafa, Fatos Barolli, Leonard Fernández, Raul Daradoumis, Thanasis Caballé, Santi Department of Languages and Informatics Systems Polytechnic University of Catalonia Barcelona Spain Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Computer Science Multimedia and Telecommunications Open University of Catalonia Barcelona Spain

Purpose: In any distributed application, the communication between the distributed processes/nodes of the distributed systems is essential for both reliability and efficiency matters. The purpose of this paper is to address this issue for distributed applications based on JXTA protocols aiming at extending and evaluating the protocols of the JXTA library for reliable P2P computing. Design/methodology/approach: After a careful examination of the current version of JXTA protocols, the need was observed for improving the original JXTA protocols such as pipe services to ensure reliable communication between nodes of the grid platform and the discovery and presence service to increase the performance of the applications. Using a mixed P2P network based on broker peers and client peers architecture, which served as a basis to extend the JXTA protocols, was the basis of the approach. Findings: The original JXTA protocols are extented/re-implemented to support the development of reliable P2P distributed applications. Practical implications: The proposed approach has been validated in practice by deploying a P2P network using nodes of PlanetLab platform and testing each of the re-implemented protocols using this real P2P network. The extended JXTA protocols can be used to develop reliable P2P distributed applications. Originality/value: Is of value by showing how to improve both efficiency reliability of JXTA protocols and services. © Emerald Group Publishing Limited.

关键词： Wide area networks

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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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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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Comparison of Routing and Wavelength Assignment Algorithms in WDM Networks

Comparison of Routing and Wavelength Assignment Algorithms i...

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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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Preface to the special issue of evolutionary computation and its applications

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and Systems 2008年第3期128卷 333-333页

作者： Kawakami, Hiroshi Tsujimura, Yasuhiro Graduate School of Informatics Kyoto University Japan Department of Computer and Information Engineering Nippon Institute of Technology Japan

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Routing and scheduling connections in networks that support advance reservations

Routing and scheduling connections in networks that support ...

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International Conference on Broadband Networks (BroadNets)

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

A key problem in networks that support advance reservations is the routing and time scheduling of connections with flexible starting time. In this paper we present a multicost routing and scheduling algorithm for selecting the path to be followed by such a connection and the time the data should start so as to minimize the reception time at the destination, or some other QoS requirement. The utilization profiles of the network links, the link propagation delays, and the parameters of the connection to be scheduled form the inputs to the algorithm. We initially present a scheme of non-polynomial complexity to compute a set of so-called non-dominated candidate paths, from which the optimal path can be found. By appropriately pruning the set of candidate paths using path pseudo-domination relationships, we also find multicost routing and scheduling algorithms of polynomial complexity. We examine the performance of the algorithms in the special case of an Optical Burst Switched network. Our results indicate that the proposed polynomial time algorithms have performance that it is very close to that of the optimal algorithm.

关键词： Routing Polynomials Scheduling algorithm Quality of service Processor scheduling computer networks Propagation delay Optical fiber networks informatics Protocols

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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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Smooth Multicast Congestion Control for Adaptive Multimedia Transmission

Smooth Multicast Congestion Control for Adaptive Multimedia ...

引用

Conference on Next Generation Internet Networks, NGI

作者： Christos Bouras Apostolos Gkamas Georgios Kioumourtzis Computer Engineering and Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

In this paper we introduce an equation-based smooth multicast congestion control for adaptive multimedia transmission over best-effort wired networks. Target of the proposed schema is (a) smooth transmission rate, in order to minimize the audio-video (AV) encoding and decoding distortion and (b) TCP friendly transmission. The "smoothness" lays in the way the TCP-friendly transmission rate is filtered. We integrate the congestion control functions in the RTP protocol and use the RTCP sender and receiver reports to provide the necessary feedback information for the sender's adaptive transmission rate. The performance evaluation of the smooth adaptation and TCP-friendliness is conducted through a number of simulations with the network simulator software (ns2). Our intention is to use this congestion control in the context of a proposed framework for multimedia transmission over wired and wireless networks.

关键词： Programmable control Adaptive control Bandwidth Feedback Multicast protocols Delay Decoding Equations Data communication Wireless application protocol

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