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On the performance of the ant colony system for solving the multidimensional knapsack problem

On the performance of the ant colony system for solving the ...

引用

IEEE Pacific Rim Conference on Communications, computers and Signal Processing

作者： R. Parra-Hernandez N. Dimopoulos Department of Electrical and Computer Engineering Laboratory for Parallel and Intelligent Systems - LAPIS Laboratory for Parallel and Intelligent Systems-LAPIS Department of Electrical and Computer Engineering University of Victoria Canada

The purpose of this paper is to present a modified version of the ant colony system (ACS) algorithm. The modified ACS algorithm is faster and it has a better performance than the standard ACS algorithm. We have established a set of local rules/modifications, that do improve the performance of the standard ACS and these are reported here.

关键词： Multidimensional systems Laboratories Intelligent systems Legged locomotion Constraint optimization Linear programming Lagrangian functions Resource management

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AutoMate: Enabling autonomic applications on the grid 5

AutoMate: Enabling autonomic applications on the grid

引用

5th Annual International Workshop on Active Middleware Services, AMS 2003

作者： Agarwal, M. Bhat, V. Liu, H. Matossian, V. Putty, V. Schmidt, C. Zhang, G. Zhen, L. Parashar, M. Khargharia, B. Hariri, S. Applied Software Systems Laboratory Department of Electrical and Computer Engineering Rutgers the State University of New Jersey United States High Performance Distributed Computing Laboratory Department of Electrical and Computer Engineering University of Arizona United States

ISBN: (纸本)0769519830

The increasing complexity, heterogeneity and dynamism of networks, systems, services applications have made our computational/information infrastructure brittle, unmanageable and insecure. This has necessitated the investigation of a new paradigm for design, development and deployment based on strategies used by biological systems to deal with complexity, heterogeneity, and uncertainty, i.e. autonomic computing. This paper introduces the AutoMate project and describes its key components. The overall objective of AutoMate is to investigate key technologies to enable the development of autonomic grid applications that are context aware and are capable of self-configuring, self-composing, self-optimizing and self-adapting. Specifically, it will investigate the definition of autonomic components, the development of autonomic applications as dynamic composition of autonomic components, and the design of key enhancements to existing grid middleware and runtime services to support these applications. © 2003 IEEE.

关键词： Middleware

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An electromechanical valve drive incorporating a nonlinear mechanical transformer

An electromechanical valve drive incorporating a nonlinear m...

引用

2003 SAE World Congress

作者： Chang, Woo Sok Parlikar, Tushar Kassakian, John G. Keim, Thomas A. Laboratory for Electromagnetic and Electronic Systems Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology United States

In traditional internal combustion engines, a camshaft acts on the valve stems to open and close the valves. Valve timing is fixed relative to piston position. On the other hand, if a valve is flexibly controlled by a variable valve actuation (VVA) system, we can achieve significant improvements in fuel efficiency, engine performance, emissions, etc. One of the most advanced variable valve actuation systems is the VVA operated by an electromechanical actuator without a camshaft, the so-called bi-positional electromechanical valve drive (BPVD). Existing BPVD's characteristically use a spring to provide the required mechanical power for operating a valve. The use of a spring provides many benefits to the design of the system, but it also results in difficult design challenges. The large holding force against the spring at the ends of the stroke virtually dictates the use of a normal-force electromagnetic actuator, which, from a servomechanical point of view, is not good compared to a shear-force bi-directional electromagnetic actuator. And, the large holding force generates a large jerk at the beginning and the end of a stroke and makes it difficult to achieve a soft valve landing. A new electromechanical valve drive (EMVD) design is proposed, which incorporates a nonlinear mechanical transformer and a shear-force electromagnetic actuator, which eliminates the large jerk and allows improved control under disturbances with acceptable average and peak electric power. This design is modeled, analyzed, and simulated. Copyright © 2003 SAE International.

关键词： Valves (mechanical)

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Positivistlc tendencies due to engineering education 6

Positivistlc tendencies due to engineering education

引用

6th IFAC Symposium on Advances in Control Education, ACE 2003

作者： Erden, Mustara Suphi Department of Electrical and Electronics Engineering Computer Vision and Intelligent Systems Laboratory Middle East Technical University Ankara Turkey

In this research it is claimed that engineering education increases the positivistic tendencies of students regarding to the social problems. A theoretical background is given in the introduction and literature review. Two hypotheses are constructed and a micro-questionnaire survey is performed to test the hypotheses. In the survey positivistic tendencies of engineering students and social science students are compared. The results are depicted and discussed in detail. One of the hypotheses was approved by the results while the other was rejected. It is concluded that the rejected hypothesis was not in accordance with the claim since it overlooked some factors effecting positivism. The results of the survey support the claim by stating that 'engineering students are more positivist than social science students'. Copyright © IFAC Advances in Control Education Oulu, Finland, 2003

关键词： Students

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Knowledge refinement using fuzzy compositional neural networks

Knowledge refinement using fuzzy compositional neural networ...

引用

Joint International Conferences on Artificial Neural Networks and Neural Information Processing, ICANN/ICONIP 2003

作者： Tzouvaras, Vassilis Stamou, Giorgos Kollias, Stefanos Image Video and Multimedia Laboratory Institute for Computer and Communication Systems Department of electrical and Computer Engineering National Technical university of Athens Greece

ISBN: (纸本)3540404082

Fuzzy relations as representational tools and fuzzy compositional operators as reasoning components, are user in this paper in order to represent knowledge expressed in semantic rules. Furthermore, neural representation and resolution of composite fuzzy relation equations provides knowledge refinement and adaptation to a specific context. A two-layer fuzzy compositional neural network is proposed in this work, with a learning algorithm changing the weights and minimize the error of the small context changes. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Semantics

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Constrained-learning in artificial neural networks

Constrained-learning in artificial neural networks

引用

IEEE Pacific Rim Conference on Communications, computers and Signal Processing

作者： R. Parra-Hernandez Laboratory for Parallel and Intelligent Systems-LAPIS Department of Electrical and Computer Engineering University of Victoria Canada

The capacity to generalize is the most important characteristic in neural networks. However, the generalization capacity is lost when over-fitting occurs during the neural network training process; i.e., although the error after the training process is very small, when new data is presented to the neural network the error is large. An approach aiming to improve the neural network generalization capacity is presented in this work.

关键词： Intelligent networks Artificial neural networks Neural networks Predictive models Signal processing Laboratories Intelligent systems Artificial intelligence parallel processing Fault tolerance

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Channel resource allocation/reallocation in cellular communication and linear programming

Channel resource allocation/reallocation in cellular communi...

引用

IEEE International Conference on systems, Man and Cybernetics

作者： R. Parra-Hernandez N. Dimopoulos Laboratory for Parallel and Intelligent Systems-LAPIS Department of Electrical and Computer Engineering University of Victoria Canada

An approach aiming to formulate the mobile network resource allocation problem is proposed here. In order to formulate the resource allocation problem, the way network resources are to be counted is defined. Then, the resource allocation problem is expressed as a multidimensional knapsack problem. The knapsack problem is relaxed and a constrained optimisation linear programming problem is obtained. A series of pseudo-utility values is obtained from the solution of the linear programming problem. The pseudo-utility values are used to establish an order by which the calls/terminals/users are to be attended by the network.

关键词： Resource management Linear programming Power control Multidimensional systems Constraint optimization Channel allocation Intelligent networks Laboratories Intelligent systems Land mobile radio cellular systems

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Emotion representation for virtual environments 7

Emotion representation for virtual environments

引用

7th International Conference on Telecommunications, ConTEL 2003

作者： Karpouzis, K. Raouzaiou, A. Tsapatsoulis, N. Kollias, S. Image Video and Multimedia Systems Laboratory Department of Electrical and Computer Engineering National Technical University of Athens ZographouAthens15780 Greece

ISBN: (纸本)9531840520

Research on networked applications that utilize multimodal information about their users' current emotional state are presently at the forefront of interest of the computer vision and artificial intelligence communities. Human faces may act as visual interfaces that help users feel at home when interacting with a computer because they are accepted as the most expressive means for communicating and recognizing emotions. Thus, a lifelike human face can enhance interactive applications by providing straightforward feedback to and from the users and stimulating emotional responses from them. Thus, virtual environments can employ believable, expressive characters since such features significantly enhance the atmosphere of a virtual world and communicate messages far more vividly than any textual or speech information. In this paper, we present an abstract means of description of facial expressions, by utilizing concepts included in the MPEG-4 standard. Furthermore, we exploit these concepts to synthesize a wide variety of expressions using a reduced representation, suitable for networked and lightweight applications. © 2003, Institute of electrical and Electronics Engineers Inc. All rights reserved.

关键词： Virtual reality

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Electromagnetic field associated with lightning return strokes to a tall structure: Influence of channel geometry

Electromagnetic field associated with lightning return strok...

引用

2003 IEEE Bologna PowerTech Conference

作者： Shostak, V. Janischewskyj, W. Hussein, M. Rachidi, F. Bermudez, J.L. Kordi, B. Department of High Voltage Engineering and Electrophysics Kyiv Polytechnic Institute Kyiv Ukraine Department of Electrical and Computer Engineering University of Toronto Toronto ON Canada Swiss Federal Institute of Technology Power Systems Laboratory Lausanne Switzerland Department of Electrical and Computer Engineering University of Manitoba Winnipeg MB Canada

ISBN: (纸本)0780379675

The paper is a contribution to the studies of factors that can affect electric (E) and magnetic (H) fields associated with lightning return strokes to tall structure. Herein, the influence of lightning channel inclination upon vertical .E-field and azimuthal H-field is analyzed. Input parameters of the simulation (injected current, properties of the tower and of the channel, etc.) are derived from experimental observations. Current distribution is calculated adopting a one-section transmission line model (1TL). For a few characteristic cases of non-vertical channel orientation, E- and H-fields produced at 2 km distance by a lightning strike to the CN Tower (546-m height) are computed? and compared to those of the vertical-channel case ("A"). For considered conditions, E-field first peak values differ from the basic case "A" by +9 to -22 %, while at late-time period (within 10 μs) E-values can differ by +152 to -75 %. For H-field, corresponding deviations are smaller: +7 to -16 % and +87 to -61 %.©2003 IEEE.

关键词： Electromagnetic fields

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VLSI design of high-throughput processing element for real-time particle filtering

VLSI design of high-throughput processing element for real-t...

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International Symposium on Signals, Circuits and systems, SCS 2003

作者： Chin, Shu-Shin Hong, Sangjin Mobile Systems Design Laboratory Department of Electrical and Computer Engineering State University of New York at Stony Brook Stony BrookNY11794-2350 United States

ISBN: (纸本)0780379799

This paper presents a VLSI ASIC design of a high-throughput processing element for real-time particle filtering applications. The implementation is based on robust and efficient fixed-point processing algorithms. The high-throughput is achieved through two-level pipelining and preserving the inherent parallelism. The pipeline depth is balanced among sub-units to reduce clock loading via reduction of unnecessary registers. The processing element can be used as a standalone particle filter or a part of parallel particle filters for high-speed and/or larger particles. © 2003 IEEE.

关键词： Monte Carlo methods

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