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2009 WRI World Congress on computer Science and Information Engineering, CSIE 2009

作者： Song, Gao Chunping, Li Computer Science and Technology Dep. Key Laboratory for Information Tsinghua University China School of Software Key Laboratory for Information Tsinghua University China

ISBN: (纸本)9780769535074

This paper presents an improved Genetic Algorithm for solving Conic Fitting problem. We first use several parallel small-populations Genetic Algorithms to obtain initial population, which has better average fitness. The range of mutation operator is also set to be gradually reduced with the growing of generation to guarantee the proportion of outstanding individuals within the population. An experiment shows that our improvements on Genetic Algorithm can remarkably increase the average fitness of population during evolution and enhance the performance of the algorithm as a whole. © 2008 IEEE.

关键词： Genetic algorithms

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Solving the non-split weighted ring arc-loading problem in a resilient packet ring using particle swarm optimization

Solving the non-split weighted ring arc-loading problem in a...

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1st International Joint Conference on Computational Intelligence, IJCCI 2009

作者： Bernardino, Anabela Moreira Bernardino, Eugénia Moreira Sánchez-Pérez, Juan Manuel Gómez-Pulido, Juan Antonio Vega-Rodríguez, Miguel Angel Department of Computer Science School of Technology and Management Polytechnic Institute of Leiria Leiria Portugal Dep. of Technologies of Computers and Communications Polytechnic School University of Extremadura Cáceres Spain

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.

关键词： Computational complexity

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Complex network model for software system and complexity measurement

Complex network model for software system and complexity mea...

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2009 WRI World Congress on computer Science and Information Engineering, CSIE 2009

作者： Song, Gao Chunping, Li Computer Science and Technology Dep. Key Laboratory for Information System Security Tsinghua University China School of Software Key Laboratory for Information System Security Tsinghua University China

ISBN: (纸本)9780769535074

This paper proposes a new method for measuring the complexity of software systems based on complex network theory. We first construct the complex network model for software system. Then, the complexity of a homogeneous system is defined according to the entropy theory. With the experiments on open source software systems, we show that our method can reveal the complexity on different aspects of software systems, such as inheritance and understanding complexity. © 2008 IEEE.

关键词： Complex networks

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A hybrid ant colony optimization algorithm for solving the terminal assignment problem

A hybrid ant colony optimization algorithm for solving the t...

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1st International Joint Conference on Computational Intelligence, IJCCI 2009

作者： Bernardino, Eugénia Moreira Bernardino, Anabela Moreira Sánchez-Pérez, Juan Manuel Gómez-Pulido, Juan Antonio Vega-Rodríguez, Miguel Angel Department of Computer Science School of Technology and Management Polytechnic Institute of Leiria Leiria Portugal Dep. of Technologies of Computers and Communications Polytechnic School University of Extremadura Cáceres Spain

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.

关键词： Genetic algorithms

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On controlling light transport in poor visibility environments

On controlling light transport in poor visibility environmen...

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ACM SIGGRAPH 2009 Courses, SIGGRAPH '09

作者： Gupta, Mohit Narasimhan, Srinivasa G. Schechner, Yoav Y. Carnegie Mellon University School of Computer Sc. Pittsburgh PA 15232 United States Technion - Israel Institute of Technology Dep. of Electrical Eng. Haifa 32000 Israel

Poor visibility conditions due to murky water, bad weather, dust and smoke severely impede the performance of vision systems. Passive methods have been used to restore scene contrast under moderate visibility by digital postprocessing. However, these methods are ineffective when the quality of acquired images is poor to begin with. In this work, we design active lighting and sensing systems for controlling light transport before image formation, and hence obtain higher quality data. First, we present a technique of polarized light striping based on combining polarization imaging and structured light striping. We show that this technique out-performs different existing illumination and sensing methodologies. Second, we present a numerical approach for computing the optimal relative sensor-source position, which results in the best quality image. Our analysis accounts for the limits imposed by sensor noise.

关键词： Visibility

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An MIH-assisted handoff mechanism for concurrent multipath transfer in wireless multihomed networks

An MIH-assisted handoff mechanism for concurrent multipath t...

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2009 IEEE 20th Personal, Indoor and Mobile Radio Communications Symposium, PIMRC 2009

作者： Huang, Chung-Ming Lin, Ming-Sian Chang, Lik-Hou Chang, Wen-Yao Lab. of Multimedia Mobile Networking Dep. of Computer Science and Information Engineering National Cheng Kung University Tainan Taiwan Emerging Smart Technology Institute Institute for Information Industry Taipei Taiwan

ISBN: (纸本)9781424451234

As more and more devices are equipped with multiple network interfaces, the multihomed technology is becoming an important technology that can provide more reliable connections against the network failure and better data transmission rate. Concurrent Multipath Transfer (CMT), which is based on SCTP, is devised for multihomed networks. CMT can transmit data over all paths to maximum the data transmission speed. One of the main concerns of CMT is the receiver buffer blocking issue, especially in multihomed wireless mobile networks. If the receiver buffer is blocked, the sender can send only one packet to the receiver. The receiver buffer blocking is mainly caused by the lost data. For small memory devices, e.g., PDA, smart phone and embedded systems, the receiver buffer is limited and has less free space to prevent receiver buffer blocking. In this paper, we proposed Media Indep.ndent Handover - Concurrent Multipath Transfer (MIH-CMT) over wireless networks to deal with the receiver buffer blocking caused by handoff loss. MIH-CMT can reduce the amount of packet loss during handoff, which may lead to the receiver buffer blocking. Simulation results show that MIH-CMT can reduce the effect of the receiver buffer blocking effectively for devices that have smaller buffer size. ©2009 IEEE.

关键词： Wireless networks

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Methods for fem analysis of riveted joints of thin-walled aircraft structures within the imperja project

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25th Symposium of the International Committee on Aeronautical Fatigue: Bridging the Gap between Theory and Operational Practice, ICAF 2009

作者： Kaniowski, Jerzy Wronicz, Wojciech Jachimowicz, Jerzy Szymczyk, Elzbieta Institute of Aviation Al. Krakowska 110/114 02-256 Warsaw Poland Dep. of Mechanics and Applied Computer Science Faculty of Mechanical Engineering Military University of Technology 2 Kaliskiego Street 00-908 Warsaw Poland

ISBN: (纸本)9789048127450

The paper deals with the modelling of riveted joints in aircraft structures with Finite Element Method. Presented works were carried out within Eureka project No. E!3496 called IMPERJA. The goal of the IMPERJA project is to increase the fatigue life of riveted joints, which will lead to an increase of the aircraft service life, a smaller number of inspections and lower operation costs of an aircraft. The project assumed FEM modelling of the operating aircraft's structure at three different complexity levels, namely considering the complete structure, a structural detail and a single riveted joint. The paper presents analyses of various rivet models and calculations of a structure and a riveted joint. In the first part examples of various models, at global and local level, were presented and usefulness of them was discussed, influence of the following simplification was analysed;• neglection of rivets in a model (elements are jointed continuously) • rivet as a rigid element (MPC) • neglection of contact phenomenon • neglection of secondary bending • neglection of residual stresses after riveting process The basis of the analysis was the asymmetric butt joint model with 14 rivets. The model which took into account secondary bending and contact phenomenon was analysed as well. The method of modelling residual stresses with temperature and thermal coefficient was used. In the second part, the example of analysis of riveted joint was demonstrated for a wing of PZL M28 Skytruck aircraft. It's is a twin-engine, high-wing, cantilever monoplane of all-metal structure with maximum take-off and landing weight 7500 kg. A submodeling technique was used there. At first, part of the wing model, based on a CAD model, was built. It includes 7 ribs and 6 bulkheads between them. Dimensions of the model eliminate stress perturbation, connected with boundary conditions, in the area near the middle rib. It was a shell model. The boundary conditions were taken on a basis of operation data

关键词： Boundary conditions

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Applying FPGA-based chip to apparent power and power factor measurement considering nonsinusoidal and unbalanced conditions

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WSEAS Transactions on Circuits and Systems 2009年第7期8卷 559-568页

作者： Wang, Shu-Chen Wu, Chi-Jui Yang, Sheng-Wen Department of Computer and Communication Engineering Taipei College of Maritime Technology Taipei Taiwan Dep. of Electrical Engineering National Taiwan University of Science and Technology Taipei Taiwan

This paper proposes a field-programmable gate array (FPGA)-based integrated circuit (IC) for computing apparent powers and power factors of power systems. In a nonsinusoidal and unbalanced three-phase power system, the calculation of apparent powers and power factors has many definitions. Load characteristics of harmonic and unbalance can not be expressed in the traditional apparent power and power factor, which only consider the fundamental and three-phase balanced sinusoidal conditions. This paper utilizes the FPGA chip to develop the platform to implement the calculation methods of apparent powers and power factors. The proposed design scheme is developed using the very high speed integrated-circuit hardware description language (VHDL), which provides high flexibility and technology indep.ndence. This paper discussed the effective power and power factor, the arithmetic power and power factor, and the fundamental power and power factor. The design of filters for the computation of fundamental frequency components is given. ModelSim is used at first to simulate the calculation of apparent powers and power factors to ensure the accuracy of timing and function. Research results show that the designed chip can compute accurately the apparent powers and power factors considering the effects of nonsinusoidal and unbalanced conditions.

关键词： System-on-chip

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VIs2sound on Reconfigurable hardware

VIs2sound on Reconfigurable hardware

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2008 International Conference on Reconfigurable Computing and FPGAs, ReConFig 2008

作者： Manilas, C. Cobos, J.P. Pelayo, F.J. Prieto, A. Romero, S. Dep. of Computer Architecture and Techonoly University of Granada Spain Dep. of Computer Science University of Jaen Spain

ISBN: (纸本)9780769534749

This work describes the implementation of a bioinspired visual processing system on configurable logic, designed for the enhancement of relevant information on a real scene, for its use on a complete system to assist the visually-impaired. For this purpose, a sensorial transduction module has been developed, which transforms visual information into sound patterns with 3D spatial localization. The requirements for this application, as portability, constrained power consumption, real-time performance, and customization to fit the specific features of the patient's affection, lead us to consider programmable logic as the best option for the design and development of the whole system, specifically FPGAs. A prototype of the system, including two video inputs with three spatial filters, two weighed sums, a disparity computation module, and the 3D sound generator, has been implemented on a Virtex-II XC2V6000, and performs at a maximum rate of 60 frames per second. © 2008 IEEE.

关键词： Reconfigurable hardware

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Work in progress - Achieving the ABET professional skills using solidarity projects

Work in progress - Achieving the ABET professional skills us...

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38th ASEE/IEEE Frontiers in Education Conference, FIE 2008

作者： Alonso, Javier López, David Cruz, Josep-Llorenç Álvarez, Carlos Jimenez-González, Darnel Fernández, Agustín Sánchez, Fermín Technical University of Catalonia Computer Architecture Dep. Spain

Traditionally, engineering studies have focused on preparing students technically and given little importance to social or ethical aspects, nor the ability to work in multi-disciplinary teams. Currently though, these skills are an added value and have been included in most prestigious centre's curricula. As a result, they have become a subject of study for the education community and the focus of numerous papers. Correspondingly, the Barcelona School of Informatics has developed a hardly explored initiative in order to inculcate these values and help students acquire these skills. This initiative gets them involved in what we call solidarity projects, where both students and professors get administrative and subsidized support to create cooperative work that will provide a solution to specific problems on developing countries and poor local areas. These projects may be introduced in some courses and during Bachelor and Master Thesis and have contributed towards the professional skills development of both students and professors involved. © 2008 IEEE.

关键词： Students

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