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GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Hui-Tang Lin Ying-You Lin Wang-Rong Chang Song-Ming Chen Department of Electrical Engineering National Cheng Kung University Taiwan Institute of Computer and Communication Engineering National Cheng Kung University Taiwan ICT-Enabled Healthcare Program Industrial Technology and Research Institute Taiwan

An integrated EPON/WiMAX network has been an attractive attention due to its features of achieving stable backhaul transmissions to WiMAX users and reducing the expenditure of network deployment. In implementing such a network, realizing a scheduling mechanism capable of sharing the available bandwidth between the heterogeneous Ethernet and WiMAX traffic in an effective manner is problematic. In the present study, this problem is addressed by using a game-theoretic-based scheme comprising a bankruptcy game and a bargaining game to perform an intra-ONU scheduling function at each ONU within the network. In the proposed approach, each ONU distributes the total amount of bandwidth allocated by the OLT between the Ethernet and WiMAX traffic buffers in accordance with the results of the bankruptcy game. By applying bargaining games, the allocated bandwidth is then further distributed to the different traffic classes within the Ethernet or WiMAX traffic in accordance with their QoS requirements. The simulation results confirm the validity and effectiveness of the proposed approach.

关键词： EPON WiMAX Traffic control Telecommunication traffic Ethernet networks Bandwidth Optical network units Job shop scheduling Processor scheduling Time division multiplexing

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DLM: A distributed Large Memory System using remote memory swapping over cluster nodes

DLM: A distributed Large Memory System using remote memory s...

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IEEE International Conference on Cluster Computing

作者： Hiroko Midorikawa Motoyoshi Kurokawa Ryutaro Himeno Mitsuhisa Sato Department of Computer and Information Science Seikei University Musashino Tokyo Japan Graduate School of Systems and Information Engineering University of Tsukuba Tennodai Tsukuba Ibaraki Japan Advanced Center of Computing and Communication Wako Saitama Japan Research Program for Computational Science RIKEN Wako Saitama Japan

Emerging 64 bitOSpsilas supply a huge amount of memory address space that is essential for new applications using very large data. It is expected that the memory in connected nodes can be used to store swapped pages efficiently, especially in a dedicated cluster which has a high-speed network such as 10 GbE and Infiniband. In this paper, we propose the distributed large memory system (DLM), which provides very large virtual memory by using remote memory distributed over the nodes in a cluster. The performance of DLM programs using remote memory is compared to ordinary programs using local memory. The results of STREAM, NPB and Himeno benchmarks show that the DLM achieves better performance than other remote paging schemes using a block swap device to access remote memory. In addition to performance, DLM offers the advantages of easy availability and high portability, because it is a user-level software without the need for special hardware. To obtain high performance, the DLM can tune its parameters independently from kernel swap parameters. We also found that DLMpsilas independence of kernel swapping provides more stable behavior.

关键词： Kernel Arrays Memory management Servers Bandwidth Performance evaluation Benchmark testing

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Robust adaptive control of linear multivariable systems

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Mediterranean Journal of Measurement and Control 2007年第2期3卷 59-67页

作者： Tahoun, Ali Husin Abouelsoud, Ahmed Ali Mahmoud, Magdi Sadek Hassan, Mohamed F. Fahmy, M.M. Computer and Control Department Faculty of Engineering Tanta University Tanta Egypt Electronic and Communication Department Faculty of Engineering Cairo University Giza Egypt Graduate Studies Program Cairo University Giza Egypt Hust University Huazhong China

In this paper, we develop an approach for robust model reference adaptive control of continuous-time MIMO linear dynamical systems in the presence of output disturbance. In comparison with earlier approaches in the literature, the proposed approach has the advantage that the assumption of knowing an upper bound of the disturbance is removed. The development of the approach relies heavily on Lyapunov's stability criterion and the dead-zone technique. The approach is applied to a numerical example of an articulated suspension system subject to output disturbance. Copyright © 2007 SoftMotor Ltd.

关键词： Multivariable systems

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MARKOV DECISION PROCESSES WITH UNCERTAIN TRANSITION RATES: SENSITIVITY AND MAX HYPHEN MIN CONTROL

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Asian Journal of Control 2008年第2期6卷

作者： Suresh Kalyanasundaram Edwin K. P. Chong Ness B. Shroff Motorola India Electronics Limited No. 66/1 Plot 5 Bagmane Techpark C. V. Raman Nagar Post Bangalore 560 093 India. Department of Electrical and Computer Engineering Colorado State University Fort Collins CO 80523-1373 USA. Professor Edwin K. P. Chong received the B.E.(Hons.) degree with First Class Honors from the University of Adelaide South Australia in 1987 graduating top of his class and the M.A. and Ph.D. degrees in 1989 and 1991 respectively both from Princeton University where he held an IBM Fellowship. He joined the School of Electrical and Computer Engineering at Purdue University in 1991 where he was named a University Faculty Scholar in 1999 and promoted to Full Professor in 2001. Since August 2001 he has been a Professor of Electrical and Computer Engineering and Professor of Mathematics at Colorado State University. His current interests are in communication networks and optimization methods. He coauthored the best-selling book An Introduction to Optimization 2nd Edition Wiley-Interscience 2001. He received the NSF CAREER Award in 1995 and the ASEE Frederick Emmons Terman Award in 1998. He coauthored a paper that was awarded Best Paper in the journal Computer Networks 2003. Professor Chong is a Fellow of the IEEE. He was founding chairman of the IEEE Control Systems Society Technical Committee on Discrete Event Systems and until recently served as an IEEE Control Systems Society Distinguished Lecturer. He has been on the editorial board of the IEEE Transactions on Automatic Control. He is currently on the editorial board of the journal Computer Networks. He has also served on the organizing committees of several international conferences. He has been on the program committees for the IEEE Conference on Decision and Control the American Control Conference the IEEE International Symposium on Intelligent Control IEEE Symposium on Computers and Communications and the IEEE Global Telecommunications Conference. He has also served in the executive committees for the IEEE Co

Solution techniques for Markov decision problems rely on exact knowledge of the transition rates, which may be difficult or impossible to obtain. In this paper, we consider Markov decision problems with uncertain transition rates represented as compact sets. We first consider the problem of sensitivity analysis where the aim is to quantify the range of uncertainty of the average per-unit-time reward given the range of uncertainty of the transition rates. We then develop solution techniques for the problem of obtaining the max-min optimal policy, which maximizes the worst-case average per-unit-time reward. In each of these problems, we distinguish between systems that can have their transition rates chosen independently and those where the transition rates depend on each other. Our solution techniques are applicable to Markov decision processes with fixed but unknown transition rates and to those with time-varying transition rates.

关键词： Markov decision processes sensitivity max-min control call admission control policy iteration

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An approach for robust SISO adaptive control

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Mediterranean Journal of Measurement and Control 2006年第4期2卷 186-193页

In this paper, we develop an approach for robust model reference adaptive control of continuous-time SISO linear dynamical systems in the presence of output disturbance. In comparison with earlier approaches in the literature, the proposed approach is advantageous in that the two assumptions of knowing an upper bound of the disturbance and knowing the high frequency gain of the system are omitted altogether. The development of the approach relies heavily on Lyapunov's stability criterion and the dead-zone technique. The applicability of the approach is demonstrated in a practical numerical example of a ship steering adaptive system subject to wave disturbance. Copyright © 2006 SoftMotor Ltd.

关键词： Adaptive control systems

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Joint Code Acquisition and Channel Estimation for UWB Transmission

Joint Code Acquisition and Channel Estimation for UWB Transm...

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Annual Conference on Information Sciences and Systems (CISS)

作者： Matteo Sabattini Elias Masry Laurence B. Milstein UC Discovery Grant Program of the State of California Center of Wireless Communication USA Department of Electrical and Computer Engineering University of California San Diego CA USA

This paper deals with joint channel estimation and pseudo-noise code acquisition for ultra-wideband communications. The estimation and acquisition in a realistic frequency selective channel, and in the presence of additive white Gaussian noise are based on the maximum-likelihood criterion. In particular, three systems are considered, namely, time-hopping, direct-sequence, and bi-orthogonal time-hopping CDMA digital systems. The efficiency of the synchronization process and the quality of the channel estimates are assessed and compared via analysis and simulations. Specifically, the performance of different systems are compared in terms of probability of correct synchronization, mean-square error of the channel estimates, and bit-error-rate.

关键词： Channel estimation Frequency synchronization Multiaccess communication Maximum likelihood estimation Signal resolution Ultra wideband technology Frequency estimation Analytical models Bit error rate Delay

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Grading lab reports effectively: using rubrics developed collaboratively by ECE and technical writing instructors

Grading lab reports effectively: using rubrics developed col...

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113th Annual ASEE Conference and Exposition, 2006

作者： Powe, Alexis Moorhead, Jane Mississippi State University United States Mississippi State University Bagley College of Engineering Shackouls Technical Communication Program United States Box 9544 Mississippi State University Mississippi State MS 39762 United States Mississippi State University Electrical and Computer Engineering Department United States Box 9571 Mississippi State University Mississippi State MS 39762 United States

This paper describes a collaboration between a sophomore/junior-level lab component in an electrical and computer engineering (ECE) course and a junior-level technical writing course within the Mississippi State University Bagley College of engineering's Shackouls Technical communication program (TCP). Grading for labs with weekly writing assignments poses challenges previously overlooked by collaborations between ECE and the TCP. Since lengthy reports are required weekly for the Digital Devices and Logic Design (ECE 3714) lab component, grade turnaround must be quick and can become extremely burdensome for teaching assistants, many of whom struggle with writing themselves due to lack of confidence or ESL challenges. This collaboration differs from other ECE-TCP collaborations significantly in that it utilizes a lab-grading system that combines traditional, non-quantitative rubrics and set penalties for mechanical/stylistic errors to expedite the grading process while retaining grading reliability among TAs. Five specific areas have been defined within each rubric to make up the total percentage of the grade, with the point values changing to reflect the focus of each lab. Topics discussed include an overview of analytic versus holistic grading and the rationale behind the authors' grading approach, previous ECE-TCP collaborations, the combined rubric-set penalties grading system for ECE 3714 with sample grading materials provided, quantitative and qualitative assessments of the newly implemented grading approach, and potential pitfalls of the authors' grading approach. © American Society for engineering Education, 2006.

关键词： Technical writing

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Edge detection using clustering algorithms

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WSEAS Transactions on computers 2005年第5期4卷 417-423页

作者： Sirin, Tuba Saglam, Mehmet Izzet Erer, Isin Gokmen, Muhittin Informatics Institute Advanced Technologies in Engineering Computer Science and Engineering Istanbul Technical University Istanbul 34469 Turkey Informatics Institute Advanced Technologies in Engineering Satellite Communication and Remote Sensing Program Istanbul Technical University Istanbul 34469 Turkey Faculty of Electrical and Electronic Engineering Electronics and Communication Department Istanbul Technical University Istanbul 34469 Turkey Faculty of Electrical and Electronic Engineering Computer Engineering Department Istanbul Technical University Istanbul 34469 Turkey

Edge detection is an important topic in image processing and a main tool in pattern recognition and image segmentation. Many edge detection techniques are available in the literature. 'A number of recent edge detectors are multiscale and include three main processing steps: smoothing, differentiation and labeling' (Ziau and Tabbone, 1997). This paper, presents a proposed method which is suitable for edge detection in images. This method is based on the use of the clustering algorithms (Self-Organizing Map (SOM), K-Means) and a gray scale edge detector (Canny, Generalized Edge Detector (GED)). It is shown that using the grayscale edge detectors may miss some parts of the edges which can be found using the proposed method.

关键词： Edge detection

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A comparative evaluation of competitive learning algorithms for edge detection enhancement

A comparative evaluation of competitive learning algorithms ...

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13th European Signal Processing Conference, EUSIPCO 2005

作者： Sirin, Tuba Saglam, Mehmet Izzet Erer, Isin Gokmen, Muhittin Ersoy, Okan Informatics Institute Advanced Technologies in Engineering Computer Science and Engineering Maslak Istanbul 34469 Turkey Informatics Institute Advanced Technologies in Engineering Satellite Communication and Remote Sensing Program Maslak Istanbul 34469 Turkey Faculty of Electrical and Electronic Engineering Electronics and Communication Department Maslak Istanbul 34469 Turkey Faculty of Electrical and Electronic Engineering Computer Engineering Department Istanbul Technical University Maslak Istanbul 34469 Turkey Purdue University School of Electrical and Computer Engineering West Lafayette IN United States

ISBN: (纸本)1604238216

Most edge detection algorithms include three main stages: smoothing, differentiation, and labeling. In this paper, we evaluate the performance of algorithms in which competitive learning is applied first to enhance edges, followed by an edge detector to locate the edges. In this way, more detailed and relatively more unbroken edges can be found as compared to the results when an edge detector is applied alone. The algorithms compared are K-Means, SOM and SOGR for clustering, and Canny and GED for edge detection. Perceptionally, best results were obtained with the GED-SOGR algorithm. The SOGR is also considerably simpler and faster than the SOM algorithm.

关键词： Edge detection

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Improving the writing-evaluation abilities of graduate teaching assistants in ECE labs

Improving the writing-evaluation abilities of graduate teach...

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2005 ASEE Annual Conference and Exposition: The Changing Landscape of engineering and Technology Education in a Global World

作者： Brocato, John Harden, Jim Chapman, Bill Mississippi State University United States Shackouls Technical Communication Program James Worth Bagley College of Engineering Mississippi State University United States Department of Electrical and Computer Engineering James Worth Bagley College of Engineering Mississippi State University United States

A project conducted by faculty in Bagley College of engineering at Mississippi State University to improve the writing-evaluation of graduate teaching assistants (TAs) in charge of undergraduate laboratories in electrical and computer engineering (ECE). The project began by using writing tutors to work with lab TAs on quality and consistency of their lab-report grading. Results from early exam administrations showed the need for TA support both before and after the exam as well as ongoing performance evaluation. The results show that the every student who took the ESL course performed better on the exam the second time with an average improvement of 57%.

关键词： engineering education

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