Massive growth of the Internet traffic in last decades has motivated the design of high-speed optical networks. Resilient Packet Ring (RPR), also known as IEEE 802.17, is a standard designed for the optimized transpor...
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ISBN:
(纸本)9789896740146
Massive growth of the Internet traffic in last decades has motivated the design of high-speed optical networks. Resilient Packet Ring (RPR), also known as IEEE 802.17, is a standard designed for the optimized transport of data traffic over optical fiber ring networks. Its design is to provide the resilience found in SONET/SDH networks but instead of setting up circuit oriented connections, providing a packet based transmission. This is to increase the efficiency of Ethernet and IP services. In this paper, a weighted ring arc-loading problem (WRALP) is considered which arises in engineering and planning of the RPR systems (combinatorial optimization NP- complete problem). Specifically, for a given set of non-split and uni-directional point-to-point demands (weights), the objective is to find the routing for each demand (i.e., assignment of the demand to either clockwise or counter-clockwise ring) so that the maximum arc load is minimized. This paper suggests four variants of Particle Swarm Optimization (PSO), combined with a Local Search (LS) method to efficient non-split traffic loading on the RPR. Numerical simulation results show the effectiveness and efficiency of the proposed methods.
The past two decades have witnessed tremendous research activities in optimization methods for communication networks. One important problem in communication networks is the Terminal Assignment Problem. This problem i...
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ISBN:
(纸本)9789896740146
The past two decades have witnessed tremendous research activities in optimization methods for communication networks. One important problem in communication networks is the Terminal Assignment Problem. This problem involves determining minimum cost links to form a network by connecting a collection of terminals to a collection of concentrators. In this paper, we propose a Hybrid Ant Colony Optimization Algorithm to solve the Terminal Assignment Problem. We compare our results with the results obtained by the standard Genetic Algorithm, the Tabu Search Algorithm and the Hybrid Differential Evolution Algorithm, used in literature.
The accurate prediction of cyberspace situation is fundamental to intrusion prevention in large scale networks. After analyzing the cyberspace situation, a cyberspace situation prediction model based on gene expressio...
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作者：
Deryakulu, DenizBüyüköztürk, ŞenerÖzçinar, HüseyinAnkara University
Faculty of Educational Sciences Department of Computer and Instructional Technologies Education 06590 Cebeci-Ankara Turkey Başkent University
Faculty of Education Department of Secondary Science and Mathematics Education Ankara Turkey Ankara University
Faculty of Educational Sciences Department of Computer and Instructional Technologies Education Ankara Turkey
The main purpose of this study was to determine the predictors of academic achievement of student Information and Communications technologies (ICT) teachers with different learning styles. Participants were 148 studen...
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The main purpose of this study was to determine the predictors of academic achievement of student Information and Communications technologies (ICT) teachers with different learning styles. Participants were 148 student ICT teachers from Ankara University. Participants were asked to fill out a personal information sheet, the Turkish version of Kolb's Learning Style Inventory, Weinstein's Learning and Study Strategies Inventory, Schommer's Epistemological Beliefs Questionnaire, and Eysenck's Personality Questionnaire. Stepwise regression analyses showed that the statistically significant predictors of the academic achievement of the accommodators were attitudes and high school GPAs;of the divergers was anxiety;of the convergers were gender, epistemological beliefs, and motivation;and of the assimilators were gender, personality, and test strategies. Implications for ICT teaching-learning processes and teacher education are discussed.
Laboratory experiments were conducted to investigate the run-up of internal solitary waves (ISWs) on steep uniform slopes in a two-layered fluid system with a free surface. A 12 m long wave flume, which incorporated a...
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The scarcity of accessible information mediums for visually impaired people is recognized by many international organizations. The situation is even worse for those students with visual impairment who have integrated ...
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This work emphasizes solving a design problem of two-dimensional (2-D) infinite-impulse-response (IIR) digital structure-specified filters by using an improved genetic algorithm, which is called the hybrid Taguchi-gen...
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In this paper we present a method for improving the generalization performance of a radial basis function (RBF) neural network. The method uses a statistical linear regression technique which is based on the orthogona...
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In this paper, a novel image-based method of distance measurement is proposed. Traditionally, the parallax method is frequently used to measure the distance between the camera and the measured surface. But for diminis...
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In this paper, a novel image-based method of distance measurement is proposed. Traditionally, the parallax method is frequently used to measure the distance between the camera and the measured surface. But for diminishing the computational complexity and inaccuracy cause by image processing procedure, the proposed system only using two parallel laser beams project to the measured surface then analyze the information of a captured image to compute the distance. Furthermore, in order to improve the accuracy of the experiment, the proposed algorithm also provides a mechanism to make sure the results will not be influenced by the angle between the optical axis of the camera and measured surface. The experimental results showed the proposed method provided precise measuring results in several different distances.
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