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Closed-form solution to calculate generator contributions to loads and line flows in an open access market

Closed-form solution to calculate generator contributions to...

引用

IEEE General Meeting Power& Energy Society

作者： H. Ghasemi C. Canizares G. Savage Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada Department of System Design Engineering University of Waterloo Waterloo ONT Canada

In an open access power market, power tracing is a very important issue as it can help allocate the total cost of transmission system usage among market participants as well as provide information on what portion of a load is being supplied by each generator. In this paper, a closed form solution to this problem is presented. This formula is obtained using both proportionality and averaging criteria, and can be used to allocate transmission system costs among users in an equitable and fair way. In comparison to other methods, the formula given in this paper can be applied to large power systems without increasing complexity and the associated computations costs.

关键词： Closed-form solution Power generation Costs Power systems Pricing Power transmission lines Transmission line theory IEEE members Power markets Computational efficiency

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Estimation of high frequency scattered microwave electric field using the extended Born approximation [microwave imaging applications]

Estimation of high frequency scattered microwave electric fi...

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Antennas and Propagation Society International Symposium

作者： Yang Yang O.A. Basir Yaxun Liu Department of System Design University of Waterloo Waterloo ONT Canada Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada

ISBN: (纸本)0780378466;0852967527

In this paper, we investigate and evaluate the performance of the extended Born approximation in a high frequency band, up to 18 GHz. We reformulate the EBA in terms of the dielectric constant. The scattered electric fields using the EBA are compared with the exact model. We demonstrate a guideline for choosing the grid size and discuss the dependence of the accuracy of EBA on size and permittivity of the anomaly. In addition, the EBA model is applied to the two anomalies case. In our work, the dielectric perturbation instead of conductivity perturbation is emphasized.

关键词： Frequency estimation Scattering Approximation methods Permittivity Integral equations Nonuniform electric fields Message-oriented middleware Green's function methods Matrices

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Corrosion protection of steel rebar in concrete by migrating corrosion inhibitors

Corrosion protection of steel rebar in concrete by migrating...

引用

Corrosion 2003

作者： Bavarian, Bezad Reiner, Lisa Kim, Chong Yeob Dept. of Manufacturing System Engineering and Management California State University Northridge 18111 Nordhoff Street NorthridgeCA91330-8332 United States Dept of Computer Aided Machine Design Osan College 17 Chunghak Dong Osan Kyunggi Do447-749 Korea Republic of

Laboratory evaluations were performed to determine the effectiveness of migrating corrosion inhibitor (MCI) for reinforced concrete. In this study, concrete densities and application methods were compared. Bode and Nyquist plots showed high resistance polarization resistance values for concrete treated with inhibitor. XPS analysis verified the presence of MCI and chloride molecules on the steel rebar surfaces, and XPS depth profiling showed a 100 nm amine-rich layer (inhibitor) and chloride ions on the rebar confirming that MCI had migrated through the concrete coverage to suppress chloride ions corrosiveness. In regard to how MCI is applied, directly to the rebar, by surface impregnation, or in a mortar coating, the effects were not apparent in the monitored corrosion potentials, bode and Nyquist plots for the samples. Additional data is required to make any conclusion about the effectiveness of an application method. At this time, the inhibitor coated rebar samples show the highest polarization resistance. © 2003 by NACE International.

关键词： Reinforced concrete

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Multimethod machine learning approach for medical diagnosing

Multimethod machine learning approach for medical diagnosing

引用

IEEE EMBS International Conference on Information Technology Applications in Biomedicine (ITAB)

作者： M. Lenic P. Povalej M. Zorman V. Podgorelec P. Kokol L. Lhotska Laboratory for system design Faculty of Electrical Engineering and Computer Science University of Maribor Maribor Slovenia Gerstner Lab Faculty of Electrical Engineering Czech Technical University Czech Republic

In this paper we present a multimethod approach for induction of a specific class of classifiers, which can assist physicians in medical diagnosing in the case of mitral valve prolapse. Mitral valve prolapse is one of the most controversial prevalent cardiac condition and may affect up to ten percent of the population and in the worst case results in sudden death. MultiVeDec is a general framework enabling researchers to generate various intelligent tools based on machine learning. In this paper we focused on various decision tree methods, which are capable of extracting knowledge in a form closer to human perception, a feature that is very important in medical field. The experiment included classifiers with various classical single method approaches, evolutionary approaches, hybrid approaches and also our newest multimethod approach. The main concern of the latest approach is to rind a way to enable dynamic combination of methodologies to the somehow quasi unified knowledge representation. The proposed multimethod approach was capable to outperform all other tested approaches by producing classifier for diagnosing mitral valve prolapse with the highest overall and average class accuracy.

关键词： Machine learning Medical diagnosis Valves Decision trees Medical diagnostic imaging Humans Knowledge representation Classification tree analysis Blood flow Laboratories

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Intelligent data analysis of human bone density

Intelligent data analysis of human bone density

引用

Annual IEEE Symposium on computer-Based Medical systems

作者： P. Povalej M. Lenic M. Zorman P. Kokol M.G.E. Peterson J.M. Lane Laboratory for System Design Faculty of Electrical Engineering and Computer Science University of Maribor Maribor Slovenia Hospital for Special Surgery New York NY USA

In this paper we present the results of an intelligent analysis of osteoporosis database gathered during a longitudinal study in which a random sample of 100 women who had passed precautionary examinations for detection of osteoporosis over five years and were not referred for a definite medical diagnosis was pulled from the records. The intelligent data analysis using advanced methods for decision tree construction was used in order to try to find the main factors that can reduce the risk for development of osteoporosis in women. Most of the extracted knowledge confirmed known medical criteria that put women to risk for osteoporosis, however some new interesting patterns have also been shown.

关键词： Data analysis Humans Osteoporosis Medical diagnostic imaging Bones Decision trees Minerals Databases Medical diagnosis Decision making

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Intelligent platform for automatic medical knowledge acquisition: detection and understanding of neural dysfunctions

Intelligent platform for automatic medical knowledge acquisi...

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Annual IEEE Symposium on computer-Based Medical systems

作者： M. Zorman P. Kokol M. Lenic P. Povalej B. Stiglic D. Flisar Laboratory for System Design Faculty of Electrical Engineering and Computer Science University of Maribor Maribor Slovenia Centre for interdisciplinary and multidisciplinary research and studies CIMRS Maribor Slovenia

The use of intelligent systems and machine learning methods, capable of automatic decision making based on already solved cases, and data mining, are getting more and more popular. Here we are faced not only with technical problems, but also with limited confidence in machine learning techniques. In some cases methods that may explicitly show the deduction process are not powerful enough. One of the possibilities is to modify/improve the methods so that the users could easily follow the process of decision making. To solve this problem, a few years ago we started to develop a platform, which enables us to develop, test and use different kinds of hybrid methods. These are meant to combine the advantages of the integrated methods-e.g., power and knowledge representation-that contribute to the quality of the acquired knowledge. In this paper we present a way of using the developed platform in order to obtain new knowledge, based on results from neurophysiological measurements We are every pleased with the performance of our intelligent platform. The first results we obtained already show some improvement in comparison to classic machine learning approaches.

关键词： Knowledge acquisition Electroencephalography Learning systems Decision making Intelligent systems Machine learning Data mining Testing Knowledge representation Nervous system

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Dynamic scheduling issues in SMT architectures

Dynamic scheduling issues in SMT architectures

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： Chulho Shin Seong-Won Lee J.-L. Gaudiot Samsung Electronics Corporation System Design Technology Laboratory Department of Electrical Engineering-Systems University of Southern California USA Department of Electrical Engineering and Computer Science University of California Irvine USA

Simultaneous multithreading (SMT) attempts to attain higher processor utilization by allowing instructions from multiple independent threads to coexist in a processor and compete for shared resources. Previous studies have shown, however, that its throughput may be limited by the number of threads. A reason is that a fixed thread scheduling policy cannot be optimal for the varying mixes of threads it may face in an SMT processor. Our adaptive dynamic thread scheduling (ADTS) was previously proposed to achieve higher utilization by allowing a detector thread to make use of wasted pipeline slots with nominal hardware and software costs. The detector thread adaptively switches between various fetch policies. Our previous study showed that a single fixed thread scheduling policy presents much room (some 30%) for improvement compared to an oracle-scheduled case. In this paper, we take a closer look at ADTS. We implemented the functional model of the ADTS and its software architecture to evaluate various heuristics for determining a better fetch policy for a next scheduling quantum. We report that performance could be improved by as much as 25%.

关键词： Dynamic scheduling Surface-mount technology Yarn Processor scheduling Detectors Multithreading Throughput Face detection Adaptive scheduling Pipelines

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Semiconductor laser distortion improvement for high performance analog optical transmission

Semiconductor laser distortion improvement for high performa...

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Midwest Symposium on Circuits and systems (MWSCAS)

作者： S. Ghoniemy L. MacEachern S. Mahmoud Department of System & Computer Engineering Carleton University Ottawa ONT Canada Department of Electronics Carleton University Ottawa ONT Canada Department of Faculty of Engineering and Design Carleton University Ottawa ONT Canada

We present a pre-distorter model derived from a modified semiconductor user model that reduces the nonlinear distortion in directly modulated semiconductor lasers. Simulation results showing improvements greater than 40dB for the second harmonic and the second and third order intermodulation distortion components over a wide frequency range are given. Performance and capability of the pre-distorter are examined for two different lasers (Ortel 1510B and Fujitsu FLD3F7CZ) under different operating conditions

关键词： Optical distortion Laser noise Semiconductor lasers Laser modes Nonlinear optical devices Nonlinear optics Optical modulation Nonlinear distortion Intermodulation distortion Frequency

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Application of novel hierarchical approach to formal verification of digital ICs

Application of novel hierarchical approach to formal verific...

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Midwest Symposium on Circuits and systems (MWSCAS)

作者： F.A. El-Licy H.S. Abdel-Aty-Zohdy Department of Information and Computer Science Institute of Statistical Studies and Research Cairo University Egypt Microelectronics System Design Laboratory Electrical and Systems Engineering Oakland University MI USA

A hierarchical approach for the abstraction of digital VLSICs is presented. Circuit layout is hierarchically abstracted into logical constructs of binary tree structures, which may be manipulated to extract circuit functionality for the purpose of verifying design correctness. VLSIC design specification in the form of HDL is hierarchically decomposed to generate logical formulae for the given specification. By comparing the above, a verification report is obtained

关键词： Formal verification Logic design Binary trees Hardware design languages Production Very large scale integration Electrical capacitance tomography Combinational circuits Data structures Boolean functions

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Doppler diversity for OFDM wireless mobile communications. Part II: time-frequency processing

Doppler diversity for OFDM wireless mobile communications. P...

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IEEE Conference on Vehicular Technology (VTC)

作者： Byung-Chul Kim I-Tai Lu System Architecture Design Lab TN Business Samsung Electronics Company Limited Suwon Gyeonggi South Korea Department of Electrical and Computer Engineering Polytechnic University Melville NY USA

A novel time-frequency processing scheme is developed to exploit Doppler diversity of time varying multipath channel for OFDM mobile communication systems. Extensive simulations show that the proposed time-frequency M... 详细信息

ISBN: (纸本)0780377575

关键词： OFDM Wireless communication Mobile communication Time frequency analysis Fading Frequency diversity Finite impulse response filter Statistics Bit error rate Signal generators

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