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International Conference on computer Supported Cooperative Work in Design

作者： Fujun Yang Wenan Tan Weiming Shen Hamada H. Ghenniwa Yunjiao Xue Department of Electrical and Computer Engineering University of Western Ontario London ONT Canada School of Computer and Information Shanghai Second Polytechnic University Shanghai China National Research Council London ONT Canada

Business process simulation plays an important role for enterprise business process re-engineering. This paper proposes a new algorithm to dynamically select a critical path with multiple constraints for enterprise process cooperative scheduling within cooperative business simulation systems. The proposed algorithm is based on Dynamic Programming and Analytic Hierarchy Process (AHP), and has been validated through a prototype implementation with case studies.

关键词： Scheduling algorithm Processor scheduling Dynamic scheduling Engines Dynamic programming Algorithm design and analysis Computational modeling Heuristic algorithms Analytical models Collaborative work

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Module-based biomarker discovery in breast cancer

Module-based biomarker discovery in breast cancer

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IEEE International Conference on Bioinformatics and Biomedicine (BIBM)

作者： Yuji Zhang J. Xuan Jason Robert Clarke W. Ressom Habtom Dept. of Electrical & Computer Engineering Virginia Polytechnic Institute and State University Arlington VA USA Lombardi Comprehensive Cancer Center Georgetown University medical Center Washington DC USA Dept. of Electrical & Computer Engineering Virginia Polytechnic Institute and State University Arlington VA Lombardi Comprehensive Cancer Center Georgetown University medical Center Washington DC

The availability of genome-wide biological network data opens up new possibilities to discover novel biomarkers and elucidate cancer-related complex mechanisms at network level. In this paper, we propose a novel module-based feature selection framework, which integrates biological network information and gene expression data to identify biomarkers, not as individual genes but as functional modules. Also, a large-scale analysis of ensemble feature selection concept is presented. The method allows combining features selected from multiple runs with various data subsampling to increase the reliability and classification accuracy of the final set of selected features. The results from four breast cancer studies demonstrate that the identified module biomarkers achieve: i) higher classification accuracy in independent validation datasets; ii) better reproducibility than individual gene biomarkers; iii) improved biological interpretability; and iv) enhanced enrichment in cancer-related “disease drivers”.

关键词： Diseases Breast cancer Proteins Gene expression Driver circuits Bioinformatics

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To Estimate Parameters of Diffusion Theory Model with Genetic Algorithms--Taking the Diffusion of Mobile Subscribes in China for Example

To Estimate Parameters of Diffusion Theory Model with Geneti...

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International Conference on E-Product E-Service and E-Entertainment

作者： Jinghui Yang Jingdong Yang School of Business Management Shanghai Second Polytechnic University Shanghai China Department of School of Optical-Electrical and Computer Engineering Shanxi Science and Technology University Shanghai China

ISBN: (纸本)9781424471591

Bass model have been used widely for diffusion curve of a new product in some countries of the world, but only a few studies have explored in the parameters' estimation of bass model. In this paper, Bass model is adopted to fit the diffusion curve of mobile subscribers of China with different parameter-estimation techniques respectively, such as NLS(Non-Linear Least Squares ) ,OLS(Ordinary Least Squares), MLE(Maximum Likelihood Estimation) and GAs (Genetic Algorithms). The parameter estimates obtained from GAs exhibit good consistency comparable to NLS, OLS, MLE When enough time series data points are available. But when the datasets just own a few data points especially not including the peak sales time period , GA can provides better predictions of future sales than the other parameter-estimation techniques. In order to more effectively make forecasts in the mobile subscribes in China during the growth phase of a new product life cycle, we can use GA to estimate the parameters of bass model as compared to currently available estimation techniques, and then give the predictions of future mobile subscribers in China.

关键词： Mobile communication Predictive models Mathematical model Marketing and sales Maximum likelihood estimation Data models

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Oblique airy wavepackets in bidispersive optical media

Oblique airy wavepackets in bidispersive optical media

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Conference on Lasers and Electro-Optics (CLEO)

作者： T. J. Eichelkraut G. A. Siviloglou I. M. Besieris D. N. Christodoulides CREOL/School of Optics University of Central Florida Orlando FL USA Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

We show that a new class of skewed, non-spreading Airy wavepackets is possible in optical bidispersive systems. Their obliquity is found to have a profound effect on their spatiotemporal acceleration dynamics. Pertine... 详细信息

ISBN: (纸本)9781557528896

关键词： Physical optics Acceleration Nonlinear optics Spatiotemporal phenomena Dispersion Optical diffraction Optical materials Optical propagation Particle beams

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Simulation tools for analysis of distribution systems with distributed resources. Present and future trends

Simulation tools for analysis of distribution systems with d...

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IEEE General Meeting Power& Energy Society

作者： Juan A. Martinez Francisco de León Venkata Dinavahi Departament d'Enginyeria Elèctrica Universitat Politècnica de Catalunya Barcelona Spain Department of Electrical and Computer Engineering of Polytechnic Institute of NYU Six Metrotech Center NY Brooklyn Department of Electrical & Computer Engineering University of Alberta Edmonton Alberta Canada

Simulation tools for analysis and design of distribution systems with distributed resources (DR) must include modeling capabilities for representing the various DR technologies. Since distribution systems were not designed for the inclusion of DR, most distribution software packages were not designed for the analysis of systems with embedded generation either. Present distribution tools can efficiently cope, for instance, with unbalanced load-flow, but they cannot deal with transient stability. This paper is aimed at reviewing the present status and the future trends of simulation tools for planning, design and operation of distribution systems with penetration of DR.

关键词： Biological system modeling Load modeling Analytical models Reliability Transient analysis Power system reliability Mathematical model

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High-efficiency inverter with H6-type configuration for photovoltaic non-isolated ac module applications

High-efficiency inverter with H6-type configuration for phot...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Wensong Yu Jih-Sheng Lai Hao Qian Chris Hutchens Jianhui Zhang Gianpaolo Lisi Ali Djabbari Greg Smith Tim Hegarty Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA National Semiconductor Corporation Santa Clara CA USA

A novel, high-efficiency inverter using MOSFETs for all active switches is presented for photovoltaic, non-isolated, AC module applications. The proposed H6-type configuration features high efficiency over a wide load range, low ground leakage current, no need for split capacitors, and low output AC-current distortion. The detailed power stage operating principles, PWM scheme, and novel bootstrap power supply for the proposed inverter are described. Experimental results of a 300 W hardware prototype show that not only are MOSFET body diode reverse-recovery and ground leakage current issues alleviated in the proposed inverter, but also that 98.3% maximum efficiency and 98.1% European Union efficiency are achieved.

关键词： Photovoltaic systems Solar power generation Pulse width modulation inverters MOSFETs Leakage current Switches Capacitors Power supplies Hardware Prototypes

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Spectral analysis techniques with Kalman filtering for estimating power quality indices

Spectral analysis techniques with Kalman filtering for estim...

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IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe)

作者： R. Zolfaghari Y. Shrivastava V. G. Agelidis G. M. L Chu Computer Engineering University of New South Wales Sydney Australia Electrical Engineering University of Sydney Sydney Australia Indian Institute of Technology Kanpur India Concordia University Montreal QUE Canada Electrical Engineering Democritus University of Thrace Greece Hong Kong Polytechnic University Hong Kong China

This paper presents the theory, design and implementation of two real time virtual instruments to measure the power quality indices such as current harmonic distortion, voltage harmonic distortion and power factor as given by the IEEE standard. Different windowing techniques are explored in the estimation of the spectra. Cross spectral analysis is used for the measurement of phase angles in voltage and current signal. The virtual instrument integrates digital signal processing (DSP) methods such as windowing techniques and Cross-spectral density estimation with Welch spectral estimation to calculate voltage and current phasors. Moreover a tunable Kalman filter with a forgetting factor is applied to further enhance the results due to noise in the measurement. Simulations followed by a real time experiment using a rectified AC waveform applied across an RL circuit is followed to support the theoretical claims and further to show the robustness of the virtual instruments. Finally the two instruments are compared with each other in terms of performance and speed.

关键词： Harmonic analysis Kalman filters Power quality Power harmonic filters Instruments Frequency domain analysis

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High efficiency DC-DC converter with twin-bus for dimmable LED lighting

High efficiency DC-DC converter with twin-bus for dimmable L...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Wensong Yu Jih-Sheng Lai Gianpaolo Lisi Ali Djabbari Evan Reutzel Jeff Morroni David Anderson Hongbo Ma Yaxiao Qin Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA National Semiconductor Corporation Santa Clara CA USA

A novel twin-bus converter using n + 1 active switches is proposed for the n-string LEDs to be dimmable from true zero to the rated current level. With the proposed twin-bus structure, the n-switches that perform the current-loop regulation can operate at very high frequency because of significantly reduced voltage stresses, while achieving high efficiency over a wide load range. With operating frequency exceeding 1 MHz in the test case, the proposed LED driver demonstrates ultra compact size inductor and fast slew rates of the LED current. The dimming controlled switch, however, can operate at a low frequency to ensure high-efficiency operation without light flicker. The detailed power stage operating principle and control scheme of the individual string current for the presented converter are described. Experimental results of a 3-string 50-W LED driver hardware prototype show that the independent string current can be regulated from zero to the desired 350 mA for dimming control. A peak efficiency of 98.3% was achieved with 1.08 MHz switching frequency.

关键词： Light emitting diodes Converters Pulse width modulation Inductors Switches Lighting Regulators

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A framework for service enterprise workflow simulation based on multi-agent cooperation

A framework for service enterprise workflow simulation based...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Fujun Yang Weiming Shen Wenan Tan Hamada H. Ghenniwa Centre of Computer-Construction Technologies National Research Council Canada London ONT Canada Department of Electrical and Computer Engineering University of Western Ontario London ONT Canada School of Computer and Information Shanghai Second Polytechnic University Shanghai China

Service enterprise workflow simulation is an important approach to analyze service enterprise business processes dynamically. Traditionally, service workflow simulation is based on the discrete event queuing theory, which lacks flexibility and scalability. To address this problem, this paper proposes a service workflow simulation framework based on multi-agent cooperation. Social rationality of software agents is introduced into the proposed framework. Adopting rationality as a decision making strategy facilitates the implementation of flexible scheduling for activity instances. A simulation system prototype is developed and a business case study is conducted to validate the proposed framework.

关键词： Computational modeling Organizations Analytical models

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An efficient recognition method for drivers' eye states

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Information Technology Journal 2010年第3期9卷 512-523页

作者： Jing-Dong, Y. Jing-Hui, Y. Ze-Su, C. Jiang-Wei, L. School of Optical-Electrical and Computer Engineering Shanghai University Science and Technology Shanghai 200093 China School of Business Management Shanghai Second Polytechnic University Shanghai 201209 China Department of Computer Science and Technology Harbin Institute of Technology Harbin 150001 China

In order to decrease the influence on the recognition of for drivers' eye states when the lightness or view angle change suddenly, a new algorithm in this study is proposed to improve the recognition rat, which combines Kanade-Lucas (K-L) optical algorithm with Adaboost cascade classifer. This algorithm recognizes and saves the Harris corner using Adaboost algorithm. Those saved corner features would be tracked using K-L algorithm. if Adaboost algorithm did not recognize them again. The method improves the recognition rate and reduces the iterate computation of identification. Because, it is difficult to distinguish the eye with the eyebrow or the eye-rim, the second threshold segmentation algorithm is advanced to decrease the initial value of the global threshold and the second threshold is set to improve the recognition rate. Freeman chain code is used to search the contour of the recognized eye and three states of the drivers' eye are determined according to Elliptic equations. The experiments showed that the method can decrease the influence of the lightness and view angle and improve the recognition precision efficiently. © 2010 Asian Network for Scientific Information.

关键词： Adaptive boosting

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