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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： A. Krol R.B. Salgado D.H. Feiglin K.R. Gangal A.S. Hardikar F.D. Thomas E.D. Lipson A. Bordikar I.L. Coman Department of Radiology State University of New York Upstate Medical University Syracuse NY USA Division of the Natural Sciences and Public Health Dillard University New Orleans LA USA Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY USA Department of Physics Syracuse University Syracuse NY USA Department of Mathematics and Computer Science Ithaca College Ithaca NY USA

Each detector on a multi-headed gamma camera can be equipped with parallel-beam (PBC) or cone-beam collimators (CBC). While PBC can provide truncation-free SPECT projection sets, CBC offers increased sensitivity in a limited field-of-view (FOV). Combined PBC and CBC SPECT data acquisition may allow increased sensitivity within CBC FOV with significantly reduced truncation artifacts in the reconstructed images. In this paper the combined CBC&PBC SPECT method is evaluated using synthetic and experimental data. We envision application of CBC&PBC SPECT in scintimammography.

关键词： Image reconstruction Imaging phantoms Cameras Biomedical imaging Radiology Collimators Single photon emission computed tomography Gamma ray detection Gamma ray detectors Data acquisition

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Study of the dynamic behavior of the Greek mainland system after the opening of the Greece-Bulgaria interconnection

Study of the dynamic behavior of the Greek mainland system a...

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2001 IEEE Porto Power Tech Conference

作者： Georgiadis, D.P. Hatziargyriou, N.D. Fourlaris, D. Blanas, I. Trastas, Th. Department of Electrical and Computer Engineering National Technical Polytechnic Athens Greece Public Power Corporation Greece

ISBN: (纸本)0780371399

This paper presents studies carried out on the Hellenic system in order to assess the effect of the existence of only one main interconnection with the rest Balkan system, the Bulgaria interconnection. The dynamic behavior is analyzed for selected disturbances and shows that for large generation loss in the Greek network there is isolation of the Greek system, due to the short activation time of the Bulgaria overload protective device. In this case load shedding is necessary for safety reasons. In general it is concluded that the Greek system remains stable, even in large disturbances. © 2001 IEEE.

关键词： Electric power plant loads

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Fine structure of a gamma burst and search for gamma-gravitational correlation

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MEASUREMENT TECHNIQUES 2001年第5期44卷 443-448页

作者： Gusev, AV Rudenko, VN Department of Electrical and Computer Engineering University of Illinois Urbana IL 61801-2991 United States Department of Public Health Sciences and Division of Critical Care Medicine University of Alberta Edmonton Alberta Canada Department of Psychiatry (ICFP) Jewish General Hospital Canada

An asymptotically optimal amplitude Bayes algorithm for searching for the gamma-gravitational correlation effect which takes account of the features of the shape of an individual gamma burst in a BATSE experiment has ...

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Study of the dynamic behavior of the Greek mainland system after the opening of the Greece-Bulgaria interconnection

Study of the dynamic behavior of the Greek mainland system a...

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Power Tech Conference

作者： D.P. Georgiadis N.D. Hatziargyriou D. Fourlaris I. Blanas T. Trastas Department of Electrical and Computer Engineering National Technical Polytechnic of Athens Greece Public Power Corporation of Greece Greece

关键词： Power system interconnection Integrated circuit interconnections Protection Safety Stability Springs Power system modeling State estimation Adders Control systems

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Application of fuzzy logic for estimation of equivalent capacity in high-speed networks

Application of fuzzy logic for estimation of equivalent capa...

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International Conference on Distributed Computing Systems Workshop

作者： L. Barolli A. Koyama T. Yamada S. Yokoyama N. Shiratori Department of Public Policy and Social Studies Yamagata University Yamagata Japan Department of Computer Software University of Aizu Fukushima Japan Department of Electrical and Information Engineering Yamagata University Yamagata Japan Research Institute of Electrical Communication University of Tohoku Sendai Japan

ISBN: (纸本)0769510809

The dynamic nature of high-speed networks poses difficult traffic control problems when trying to achieve efficient use of network resources. To cope with rapidly changing network conditions, traffic control methods for high-speed networks must be adaptive, flexible and intelligent for efficient network management. The use of intelligent methods based on fuzzy logic, neural networks and genetic algorithms can prove to be efficient for such traffic control. In this paper, we propose a fuzzy equivalent capacity estimator for bandwidth allocation in high-speed networks. Performance evaluation via simulation shows that the proposed fuzzy estimator has a good equivalent capacity estimation compared with fluid flow and stationary approximations.

关键词： Fuzzy logic High-speed networks Traffic control Intelligent networks Adaptive systems Programmable control Adaptive control Neural networks Genetic algorithms Channel allocation

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A simulation study for allocation of base stations in mobile communication networks

A simulation study for allocation of base stations in mobile...

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International Conference on Information Networking

作者： T. Yamada Y. Takahashi L. Barolli N. Shiratori Department of Public Policy and Social Studies Yamagata University Yamagata Japan Graduate School of Information Science and Engineering Tokyo Institute of Technology Meguro Tokyo Japan Research Institute of Electrical Communication University of Tohoku Sendai Japan

ISBN: (纸本)0769509517

In actual mobile communication networks, the users' locations, the number of mobile communication users, and their behavior change depending on the time zone. This dependency affects the cell traffic; thus, the allocation of base stations (BSs) in the service area is an important problem to be investigated. In this paper we propose a new model for allocation of BSs in mobile communication networks, taking account of user distribution, user movement, channel occupancy, and handover. On the basis of this model, we develop a simulation system and carried out many simulations to evaluate the system performance. For simulations, we consider the actual location of the road network and the population distribution in Yamagata City, Japan. We carried out many simulations for various scenarios and parameters. The performance evaluation shows that our simulation system makes a good BS allocation.

关键词： Base stations Intelligent networks Mobile communication public policy Traffic control Mathematical model Telecommunication traffic Communication networks Information science System performance

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Training artificial neural networks: Backpropagation via nonlinear optimization

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Journal of Computing and Information Technology 2001年第1期9卷 1-14页

作者： Skorin-Kapov, Jadranka Tang, K. Wendy W.A. Harriman School for Management Policy State University of New York at Stony Brook Stony BrookNY11794-3775 United States Department of Electrical and Computer Engineering State University of New York at Stony Brook Stony BrookNY11794-2350 United States

In this paper we explore different strategies to guide backpropagation algorithm used for training artificial neural networks. Two different variants of steepest descent-based backpropagation algorithm, and four different variants of conjugate gradient algorithm are tested. The variants differ whether or not the time component is used, and whether or not additional gradient information is utilized during one-dimensional optimization. Testing is performed on randomly generated data as well as on some benchmark data regarding energy prediction. Based on our test results, it appears that the most promissing backpropagation strategy is to initially use steepest descent algorithm, and then continue with conjugate gradient algorithm. The backpropagation through time strategy combined with conjugate gradients appears to be promissing as well.

关键词： Conjugate gradient method

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计算机和专家对糖尿病性视网膜病变早期视网膜病损诊断的比较

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美国医学会眼科杂志（中文版） 2001年第4期13卷 212-217,225页

作者： Lee SC Lee ET From the School of Electrical and Computer Engineering University of Oklahoma Norman ( Dr S. Lee ) the College of Public Health ( Drs E. Lee and Wang and Ms Russell) and the Dean McGee Eye Institute and Department of Ophthalmology ( Drs Kingsley and Wa

目的：使用彩色眼底照片来调查计算机系统和专家间在检出早期的糖尿病性视网膜病损时是否具有可比性。方法：开发了一种计算机系统，通过使用图像处理过程和图形识别技术以发现早期糖尿病性视网膜病损（出血和微动脉瘤，硬质渗出，棉毛... 详细信息

目的：使用彩色眼底照片来调查计算机系统和专家间在检出早期的糖尿病性视网膜病损时是否具有可比性。方法：开发了一种计算机系统，通过使用图像处理过程和图形识别技术以发现早期糖尿病性视网膜病损（出血和微动脉瘤，硬质渗出，棉毛斑）。用获自于奥克拉荷马州的美国印第安人的彩色眼底照片来开发和测试系统。使用3种诊断分类，利用一组369幅彩色眼底幻灯片对计算机系统进行训练，分类包括：病损存在，有问题，或无病损（Y／Q／N），用另外一组不同的428幅幻灯片对该系统进行检测和评估。将其诊断结果与2位专家－Wisconsin大学眼底照相读片中心（Madison) 的分级者和普通眼科医生间的诊断结果进行比较。试验包括用3种（Y／Q／N）和2种诊断分类（Y／N）（有问题的在后者中排除）进行比较。结果：在训练阶段，视网膜专家和计算机系统检出3种病损的一致率，灵敏度和特异性均超过90％，K统计率较高（0．75－0．97），表明在专家和计算机系统间有较好的一致性。在测试阶段。计算机系统和专家间的结果与训练阶段是一致的，具有可比性。结论：在早期视网膜病损的诊断中，计算机视觉系统的表现与专家具有可比性，然而，这是一种自动化的，电子学上容易达到的，非侵入性的计算机系统，糖尿病性视网膜病变早期病损的诊断中可成为一种群众中的筛查工具和临床助手。

关键词：糖尿病性视网膜病变早期诊断视网膜损伤计算机专家

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An intelligent fuzzy routing scheme for improving ATM network performance using violation tagging function 11

An intelligent fuzzy routing scheme for improving ATM networ...

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11th International Workshop on Database and Expert Systems Applications, DEXA 2000

作者： Barolli, L. Koyama, A. Yamada, T. Yokoyama, S. Department of Public Policy and Social Studies Yamagata University 1-4-12 Kojirakawa-machi Yamagata990-8560 Japan Department of Computer Software University of Aizu Tsuruga Ikki-machi Aizu-WakamatsuFukushima965-8580 Japan Department of Electrical and Information Engineering Yamagata University 4-3-16 Jonan YonezawaYamagata992-8510 Japan

ISBN: (纸本)0769506801

In ATM networks, traffic control design is major challenge because of the diverse services and the need for efficient network resource engineering. To cope with rapidly changing network conditions, traffic control methods for high speed networks must be adaptive, flexible, and intelligent for efficient network management. The use of intelligent algorithms based on fuzzy logic, neural networks and genetic algorithms can be efficient for traffic control in ATM networks. We propose a routing scheme which is based on fuzzy logic. The proposed scheme of routing the tagged cells can improve network utilization. Performance evaluation via simulations shows that the DPFC decision is very close to the ideal decision. The DPFC and FRM were able to send to the destination node 31% and 54% of tagged cells, respectively. © 2000 IEEE.

关键词： Asynchronous transfer mode

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An intelligent fuzzy routing scheme for improving ATM network performance using violation tagging function

An intelligent fuzzy routing scheme for improving ATM networ...

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International Workshop on Database and Expert Systems Applications

作者： L. Barolli A. Koyama T. Yamada S. Yokoyama Department of Public Policy and Social Studies Yamagata University Yamagata Japan Department of Computer Software University of Aizu Fukushima Japan Department of Electrical and Information Engineering Yamagata University Yonezawa Yamagata Japan

关键词： Intelligent networks Routing Traffic control Fuzzy logic Design engineering High-speed networks Adaptive systems Programmable control Adaptive control Neural networks

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