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IEEE Control Systems Magazine 2007年第4期27卷 89-105页

作者： Paley, Derek A. Leonard, Naomi Ehrich Sepulchre, Rodolphe Grünbaum, Daniel Parrish, Julia K. Princeton University Department of Mechanical and Aerospace Engineering Princeton NJ 08544 United States Department of Mechanical and Aerospace Engineering Program in Applied and Computational Mathematics Princeton University Princeton NJ 08544 United States Department Electrical Engineering and Computer Science University of Liège Liège Belgium School of Oceanography Department of Biology University of Washington Seattle WA United States Biology Department School of Aquatic and Fishery Sciences University of Washington Seattle WA United States

A description of the so called "particles with coupled oscillator dynamics" (PCOD) is presented which is used to model, analyze and synthesize collective motion. An oscillator model with spatial dynamics is presented to help describe how to design steering control laws while it is being used to study biological collectives. Lastly, both engineering and biological analysis were described.

关键词： Oscillators (mechanical)

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Molecular dynamic simulation of heat pulse propagation in multiwall carbon nanotubes

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Physical Review B 2007年第15期76卷 155424-155424页

作者： Taejin Kim Mohamed A. Osman Cecilia D. Richards David F. Bahr Robert F. Richard Material Science Program Washington State University Pullman Washington 99164-4620 USA Department of Physics Washington State University Pullman Washington 99164-2814 USA School of Electrical Engineering and Computer Science Washington State University Pullman Washington 99164-2752 USA School of Mechanical and Materials Engineering Washington State University Pullman Washington 99164-2920 USA

The propagation of heat pulses in zigzag and armchair double wall nanotubes (DWNTs) has been investigated using molecular dynamics simulations. It is found that the leading heat wave packets in zigzag (9,0)∕(18,0) and armchair (5,5)∕(10,10) DWNTs move with the speed of longitudinal acoustic (LA) phonon modes. The intensities of the leading heat wave packets in outer and inner shells in DWNTs were found to be five to seven times larger than that of the corresponding single wall nanotubes (SWNTs). The heat energy carried by the leading heat wave packets in zigzag DWNT was about four and five times more than those in armchair DWNT shells. Within the leading LA wave packet, the strain in the inner shell of the DWNTs is stronger than the strain in the outer shell and considerably larger than strain in the corresponding SWNTs. The regions with the largest strain coincide with the regions of high kinetic temperatures within the LA mode wave packets. The higher energy of the LA mode waves in DWNT shells compared to SWNT is attributed to the presence of higher strain fields in DWNTs compared to individual SWNTs. The higher strain in the inner shell of DWNT compared to the outer shell accounts for the three to five times higher kinetic energy of leading wave packets in inner shells compared to those in outer shells. The induced strain fields in zigzag DWNT are distributed over a wider region compared to armchair DWNT, and the strains in inner and outer shells of zigzag DWNT are out phase by 180°.

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功率分流混合电动车辆模型的演算和实验论证

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传动技术 2007年第4期21卷 32-45页

作者： Fazal U. Syed Ming L. Kuang John Czubay Hao Ying 谷雨(译) Department of Electrical and Computer Engineering Wayne State University Detroit MI 48202 USA the Hybrid Vehicle Program Sustainable Mobility Technologies Laboratory II Ford Motor Company Dearborn MI 48120 USA the Department of Electrical and Computer Engineering Wayne State University Detroit MI 48202 USA 不详

由于环保和效率等原因混合电动车辆(HEVS)已经具有很大的吸引力。一个典型的HEV由两个动力系统:一个是普通的动力源如一台汽油机、一台柴油机或一组燃料电池和一个电动系统(包含一台电动机和一台发电机)组成,它可能产生比普通车辆高的... 详细信息

由于环保和效率等原因混合电动车辆(HEVS)已经具有很大的吸引力。一个典型的HEV由两个动力系统:一个是普通的动力源如一台汽油机、一台柴油机或一组燃料电池和一个电动系统(包含一台电动机和一台发电机)组成,它可能产生比普通车辆高的燃油经济性。而且,这样的车辆不需要外部充电,而在其内部存在燃料基本设施。HEV的功率分流动力系统构造的独特的HEV动力系统结构串联和并联型式的优点。但是操纵功率分流HEV动力系统要求一个完善的控制系统。设计这样的控制系统要有适当精确的HEV装置的平面模型。对于串联和并联型式的大量研究已经开发了许多动力平面模型。但一个完整的和有效的功率分流HEV动力系统的动力模型尚处于初期阶段。本文提出了在不同传动条件下可实际地和重复所有静态和瞬态现象的功率分流动力系统HEV的动力模型。首次表明了数学推导和这种平面模型和构件的表达,其次是通过计算机仿真分析、验证及性能鉴定和试验车辆在Ford公司性能道路试验实测进行比较。该模拟和实验结果的极好的吻合证实所引导的平面模型的精确性和正确性。因为该平面模型是综合用型谱方法论的系统定向子系统建立的,它很容易改变子系统的功率。开发该平面模型是用来分析和了解动力系的控制动力学,子系统和构件间的干扰以及由于工况和波动的影响的变化的系统瞬变。该平面模型也可用于车辆系统控制器的开发,能量管理战略的估价,结果的解析,编码算法的证明,及其中其他许多目的。

关键词：混合电动车辆功率分流车辆模型实验动力系统平面模型计算机仿真分析演算

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功率分流混合电动车辆模型的演算和实验论证

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传动技术 2007年第3期21卷 30-34,26页

作者： Fazal U. Syed Ming L. Kuang John Czubay HAO Ying Department of Electrical and Computer Engineering Wayne State University Detroit MI 48202 USA the Hybrid Vehicle Program Sustainable Mobility Technologies Laboratory Ⅱ Ford Motor Compa ny Dearborn M1 48120 USA.

关键词：电动无级变速器(e-CVT) 推导混合电动车辆( HEV) 模型功率分流仿真论证

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A comparison between traditional shift-and-add (SAA) and point-by-point back projection (BP) -- relevance to morphology of microcalcifications for isocentric motion in Digital Breast tomosynthesis (DBT)

A comparison between traditional shift-and-add (SAA) and poi...

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IEEE Symposium on Bioinformatics and Bioengineering (BIBE)

作者： Ying Chen Joseph Y. Lo James T. Dobbins Department of Electrical and Computer Engineering Southem Illinois University Carbondale Carbondale IL USA Duke Adavanced Imaging Laboratories Duke University Medical Center Duke University Durham NC USA Department of Biomedical Engineering Duke University and Duke University Medical Center Durham North Carolina 27710 Duke Advanced Imaging Laboratories Duke University and Duke University Medical Center Durham North Carolina 27710 Medical Physics Graduate Program Duke University and Duke University Medical Center Durham North Carolina 27710

Digital breast tomosynthesis (DBT) is a three-dimensional imaging technique providing an arbitrary set of reconstruction planes in the breast with limited series of projection images. This paper describes a comparison between traditional shift-and-add (SAA) and point-by-point back projection (BP) algorithms by impulse response and modulation transfer function (MTF) analysis. Due to the partial isocentric motion of the x-ray tube in DBT, structures such as microcalcifications appear slightly blurred in traditional shift-and-add (SAA) images in the direction perpendicular to the direction of tube's motion. Point-by-point BP improved rendition of microcalcifications. The sharpness and morphology of calcifications were improved in a human subject images. A filtered back projection (FBP) deblurring approach was used to demonstrate deblurred point-by-point BP tomosynthesis images. The point-by-point BP rather than traditional SAA should be considered as the foundation of further deblurring algorithms for DBT reconstruction.

关键词： Morphology Image reconstruction X-ray imaging Back Image edge detection Breast cancer Detectors Biomedical engineering Transfer functions Humans

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Lattice Boltzmann Algorithms for Fluid Turbulence

Lattice Boltzmann Algorithms for Fluid Turbulence

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DoD High Performance Computing Modernization program.Users Group

作者： G. Vahala J. Yepez M. Soe L. Vahala S. Ziegeler Department of Physics The College of William and Mary Williamsburg VA USA U.S. Air Force Research Laboratory MA USA US Air Force Research Laboratory (AFRL) Hanscom Field MA Department of Mathematics and Science Rogers State University Claremore OK USA Department of Electrical & Computer Engineering Old Dominion University Norfolk VA USA High Performance Computing Modernization Program Mississippi State University MS

Lattice Boltzmann algorihms are a mesoscopic representation of nonlinear continuum physics (like Navier-Stokes, magnetohydro dynamics (MHD), Gross- Pitaevskii equations) which are ideal for parallel supercomputers because they transform the difficult nonlinear convective macroscopic derivatives into purely local moments of distribution functions. The macroscopic nonlinearities are recovered by relaxation distribution functions in the collision operator whose dependence on the macroscopic velocity is algebraically nonlinear and thus purely local. Unlike standard computational fluid dynamics codes, there is no loss in parallelization in handling arbitrary geometric boundaries, e.g., using bounce-back rules from kinetic theory. By encoding detailed balance into the collision operator through the introduction of discrete H-function, the lattice Boltzmann algorithm can be made unconditionally stable for arbitrary high Reynolds numbers. It is shown that this approach is a special case of a quantum lattice Boltzmann algorithm that entangles local qubits through unitary collision operators and which is ideally parallelized on quantum computer architectures. Here we consider turbulence simulations using 2,048 PEs on a 1,6003-spatial grid. A connection is found between the rate of change of enstrophy and the onset of laminar-to- turbulent flows.

关键词： Lattice Boltzmann methods Magnetohydrodynamics Distribution functions Quantum computing Quantum entanglement Physics Fluid dynamics Navier-Stokes equations Nonlinear equations Supercomputers

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Design and analysis of an adaptive, global strategy for detecting and mitigating distributed DoS attacks in GRID environments

Design and analysis of an adaptive, global strategy for dete...

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39th Annual Simulation Symposium, 2006

作者： Znati, Taieb Amadei, James Pazehoski, Daniel R. Sweeny, Scott Department of Computer Science Telecommunication Program Department of Electrical and Computer Engineering

ISBN: (纸本)0769525598

Basic protection schemes against Denial-of-Service (DoS) are based on a perimeter-based model, where attacks are dealt with after they occur. This is quite often too late to prevent damage or loss of resources and service. The focus of this paper is to investigate a distributed defense method that can neutralize the attack before it reaches the potential target in mass. In order to effectively implement this method, this paper proposes a progressive, globally deployable sentinel scheme for data sampling, packet inspection, and DoS attack detection and recovery. A simulation framework is developed to study the performance of the proposed scheme. The results show a significant improvement in how the network deals with DoS attacks, in comparison to local DoS detection and prevention schemes. © 2006 IEEE.

关键词： computer crime

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Decision Fusion of Circulating Markers for Breast Cancer Detection in Premenopausal Women

Decision Fusion of Circulating Markers for Breast Cancer Det...

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IEEE Symposium on Bioinformatics and Bioengineering (BIBE)

作者： Jonathan L. Jesneck Sayan Mukherjee Loren W. Nolte Anna E. Lokshin Jeffrey R. Marks Joseph Lo Duke Advanced Imaging Labs Institute for Genome Sciences and Policy Department of Computer Science Duke University USA Department of Electrical and Computer Engineering Division of Hematology/Oncology University of Pittsburgh School of Medicine Pittsburgh PA USA Division of Hematology/Oncology University of Pittsburgh Cancer Institute Pittsburgh PA USA Division of Hematology/Oncology University of Pittsburgh Cancer Institute Pittsburgh PA Institute for Genome Sciences and Policy Department of Experimental Surgery Medical Center Duke University USA Department of Experimental Surgery Duke University Medical Center Medical Physics Graduate Program Duke University Durham NC USA

Current mammographic screening for breast cancer is less effective for younger women. To complement mammography for premenopausal women, we investigated the feasibility screening test using 98 blood serum proteins. Because the data set was very noisy and contained only weak features, we used a classifier designed for noisy data: decision fusion. Decision fusion outperformed both a support vector machine (SVM) and linear regression with forward stepwise feature selection on all three two-class classification tasks: normal tissue vs. cancer, normal tissue vs. benign lesions, and benign lesions vs. cancer. Decision fusion detected cancer moderately well (AUC=0.84 on normal vs. cancer), demonstrating promise as a screening tool. Decision fusion also detected benign lesions similarly well (AUC=0.83 on normal vs. benign lesions) and was the only classifier to achieve any success in separating benign from malignant lesions (AUC=0.64 on benign vs. cancer). The classification results suggest that the assayed proteins are more indicative of a secondary effect, such as immune response, rather than specific for breast cancer. In conclusion, the decision fusion classifier demonstrated some promise in detecting breast lesions and outperformed other classifiers, especially for the very noisy classification problem of distinguishing benign from malignant lesions.

关键词： Breast cancer Cancer detection Lesions Proteins Support vector machines Support vector machine classification Mammography Testing Blood Linear regression

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A constant revenue model for telecommunication networks

A constant revenue model for telecommunication networks

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International Conference on Networking, International Conference on Systems andInternational Conference on Mobile Communications and Learning Technologies, ICN/ICONS/MCL'06

作者： Sukasdadi, Hapsara R. Verma, Pramode K. Graduate Program in Telecommunication System Department of Electrical and Computer Engineering

ISBN: (纸本)0769525520

It is well known that the quality of service provided by a telecommunication network as measured by the probability of blocking decreases rapidly when the incident traffic exceeds the design limits of the network. A higher probability of blocking results in reduced throughput and loss of revenue for the service provider. This paper presents a mechanism that introduces priority in a telephone system with the objective of providing a defined grade of service to priority traffic carrying a higher price tag. The non-priority traffic carries a lower price tag and a lower grade of service. The proposed pricing scheme maintains the overall revenue associated with the network at a constant level over a wide range of incident traffic. © 2006 IEEE.

关键词： Telecommunication networks

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An Information Theoretic Framework for Ontology-based Bioinformatics

An Information Theoretic Framework for Ontology-based Bioinf...

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Information Theory and Applications Workshop, ITA

作者： Gil Alterovitz Michael Xiang Marco F. Ramoni Harvard Partners Center for Genetics and Genomics Harvard Medical School Boston MA USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Department of Biology Massachusetts Institute of Technology Cambridge MA USA Division of Health Sciences and Technology Harvard Medical School and Massachusetts Institute of Technology Boston MA Children's Hospital Informatics Program Boston MA Harvard Partners Center for Genetics and Genomics Harvard Medical School Boston MA.

With myriad information being generated from high-throughput experiments such as microarrays and sequencing technologies, an ever-increasing amount of data is being recorded and analyzed with the help of hierarchical ontologies, such as the gene ontology (GO). We have developed a novel framework- based on the well established foundations of information theory- that allows for the evaluation of new types of hypotheses. The framework, encapsulated in open biomedical ontology-based exploration and search (OBOES), has already been applied in the investigation of different kinds of questions. The resulting framework enables the new field of information theoretic ontology-based analysis. We have applied this framework to create methods to re-engineer ontologies, explore fundamental questions on the evolution of biological complexity, determine optimal ontology terms for bioinformatics analysis, and quantify the usefulness of biofluids as proxies for tissues/diseases. In each case, we found that our methods provide novel, significant findings. An open source Java implementation of OBOES is available at: http://***.

关键词： Ontologies Bioinformatics Genomics Information analysis Biological information theory Information theory Genetic communication Humans Biochemistry Frequency

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