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Quantum Electronics and Laser Science Conference, QELS 1999

作者： Kuditcher, A. Hehlen, M.P. Florea, C.M. Winick, K.W. Rand, S.C. Department of Electrical Engineering and Computer Science University of Michigan 1301 Beat Avenue Ann ArborMI48109-2122 United States Division of Applied Physics University of Michigan United States

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A HIGH-RESOLUTION TIME-FREQUENCY ANALYSIS OF THE SINGING VOICE

A HIGH-RESOLUTION TIME-FREQUENCY ANALYSIS OF THE SINGING VOI...

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1999 International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications, MAVEBA 1999

作者： Mellody, Maureen Wakefield, Gregory H. Applied Physics Program 500 East University Dr. Ann ArborMI48109-1120 United States Department of Electrical Engineering and Computer Science University of Michigan 1301 Beat Ave. Ann ArborMI48109-2122 United States

We apply the modal distribution, a high-resolution time-frequency distribution, to the study of sung musical passages. Evidence is presented comparing the modal distribution with the spectrogram for a set of synthetic signals which emulate human singing. We then compare the two techniques for sung passages from four student sopranos with respect to measures of the instantaneous frequency and amplitude of the partials. In general, the modal distribution appears to be a more sensitive measure of individual differences in vocal production than the spectrogram. © 1999 Models and Analysis of Vocal Emissions for Biomedical Applications, MAVEBA 1999. All rights reserved.

关键词： Modal analysis

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Proximal femoral density patterns are consistent with bicentric joint loads

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computer Methods in Biomechanics and Biomedical engineering 1999年第4期2卷 271-283页

作者： Fischer, Kenneth J. Jacobs, Christopher R. Levenston, Marc E. Cody, Dianna D. Carters, Dennis R. Musculoskeletal Research Center Department of Orthopaedic Surgery University of Pittsburgh Pittsburgh PA 15213 United States Department of Orthopaedics Musculoskeletal Research Laboratory Pennsylvania State University School of Medicine Hershey PA 17033 United States Department of Electrical Engineering and Computer Science Continuum Elect romechanics Mhoratory Massachusetts Institute of Technology Hershey MA 02139 United States Department of Diagnostic Radiology Division of Radiologic Physics and Engineering Henry Ford Hospital Detroit MI 48202 United States Department of Veterans Affairs Medical Center Rehabilitation Research and Development Center Palo Alto CA 94304-1200 United States Department of Mechanical Engineering Stanford University Biomechanical Engineering Program Stanford CA 94305-402 United States

We developed an alternate method for density-based load estimation and applied it to estimate hip joint load distributions for two femora. Two-dimensional finite element models were constructed from single energy quantitative computed tomography (QCT) data. Load estimation was performed using five loading regions on the femoral head. Within each loading region, individual nodal loads, normal to the local surface, were supplied as input to the load estimation. An optimization procedure independently adjusted individual nodal load magnitudes in each region, and the magnitudes of muscle forces on the greater trochanter, such that the applied tissue stimulus approached the reference stimulus throughout the model. Dominant estimated load resultant directions were generally consistent with published experimental data for loads during gait. The estimated loads also suggested that loads near the extremes of the articulating surface may be important (even required) for development and maintenance of normal bone architecture. Estimated load distributions within nearly all regions predicted bicentric loading patterns, which are consistent with observations of hip joint incongruity. Remodeling simulations with the estimated loads predicted density distributions with features qualitatively similar to the QCT data sets. This study illustrates how applications of density-based bone load estimation can improve understanding of dominant loading patterns in other bones and joints. The prediction of bicentric loading suggests a very fine level of local adaptation to details of joint loading. © 1999 OPA (Overseas Publishers Association) N.V.

关键词： Finite element method

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Understanding missile autopilot design using the H/sub /spl infin// loop shaping design procedure

Understanding missile autopilot design using the H/sub /spl ...

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IEEE Conference on Control Technology and Applications (CCTA)

作者： T.J. Urban P. Iwaskiw P.A. Iglesias Applied Physics Laboratory Johns Hopkins University Laurel MD USA Department Electrical and Computer Engineering Johns Hopkins University Baltimore MD USA

This paper presents different controller topologies for a missile autopilot. The controllers are based on a loop shaping design procedure due to McFarlane and Glover. The nature of the controllers obtained is discusse... 详细信息

关键词： Missiles Robust control Shape control Topology Feedback loop Control design Robustness Open loop systems Tracking loops Acceleration

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Active probes for 2-port network analysis within 70-230 GHz

Active probes for 2-port network analysis within 70-230 GHz

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Microwave, MTT-S International Symposium

作者： O. Wohlgemuth M.J.W. Rodwell R. Reuter J. Braunstein M. Schlechtweg Fraunhofer Institute for Applied Solid Slate Physics Freiburg im Breisgau Germany Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

Active probes for 2-port on-wafer network analysis within 70-230 GHz are presented. The probe contains an integrated circuit, based on nonlinear transmission lines (NLTL), which has all elements of an S-parameter test set. 2-port measurements with these active probes were carried out. Compared to earlier active probe systems, measurement accuracy is greatly improved.

关键词： Probes Scattering parameters Circuit testing Integrated circuit measurements Bandwidth Cables Transmission line measurements Signal generators Directional couplers Packaging

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Time-frequency analysis of Doppler sinusoidal shift signal with new figure eight kernel

Time-frequency analysis of Doppler sinusoidal shift signal w...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Y. Noguchi K. Watanabe E. Kashiwagi T. Kawamura K. Kinoshita F. Matsumoto S. Sugimoto Department of Applied Physics National Defense Academy Yokosuka Japan Department of Computer Science National Defense Academy Yokosuka Japan Faculty of Electrical Engineering Shonan Insitutute of Technology Fujisawa Japan

In order to apply the Cohen's class Time-Frequency (TF) analysis using a novel kernel to the blood flow signal analysis, we investigated a higher resolution kernel for the ultrasound Doppler sinusoidal shift signal. We used three kinds of kernel, the Wigner distribution, the Choi-Williams distribution (CWD), and our new figure eight kernel (FED). The results show that the demodulation accuracy with FED is higher and the negative components are smaller than the CWD.

关键词： Time frequency analysis Kernel Signal analysis Ultrasonic imaging Signal resolution Blood flow physics computer science Demodulation Fluid flow measurement

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An agent-based infrastructure for enterprise integration 1

An agent-based infrastructure for enterprise integration

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1st International Symposium on Agent Systems and Applications and 3rd International Symposium on Mobile Agents, ASA/MA 1999

作者： Cost, R. Scott Finin, Tim Labrou, Yannis Luan, Xiaocheng Peng, Yun Soboroff, Ian Mayfield, James Boughannam, Akram Department of Computer Science and Electrical Engineering Laboratory for Advanced Information Technology University of Maryland Baltimore County BaltimoreMD21250 United States Research and Technology Development Center Johns Hopkins University Applied Physics Laboratory LaurelMD20723 United States Advanced Manufacturing Solutions Development IBM Corporation Boca RatonFL33431 United States

ISBN: (纸本)0769503403

Jackal is a Java-based tool for communication using the KQML agent communication language. Some features that make it extremely valuable to agent development are its conversation management facilities, flexible, blackboard style interface and ease of integration. Jackal has been developed in support of an investigation of the use of agents in enterprise-wide integration of planning and execution for manufacturing. This paper describes Jackal at a surface and design level, and demonstrates its use in a multiagent system that supports intelligent integration of enterprise planning and execution.

关键词： Multi agent systems

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Experimental study of the effect of the quantum well structures on the thermoelectric figure of merit in Si/Si/sub 1-x/Ge/sub x/ system

Experimental study of the effect of the quantum well structu...

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International Conference on Thermoelectrics (ICT)

作者： X. Sun S.B. Cronin J. Liu K.L. Wang T. Koga M.S. Dresselhaus G. Chen Department of Physics Massachusetts Institute of Technology Cambridge MA USA Department of Electrical Engineering University of California Los Angeles Los Angeles CA USA Division of Engineering and Applied Sciences Harvard University Cambridge MA USA Department of Electrical Engineering and Computer Science and Department of Physics Massachusetts Institute of Technology MA USA Department of Mechanical and Aerospace Engineering University of California Los Angeles Los Angeles CA USA

In bulk form, Si/sub 1-x/Ge/sub x/ is a promising thermoelectric material for high temperature applications. In this paper, we report results from an experimental study as well as theoretical modeling of the quantum confinement effect on the enhancement of the thermoelectric figure of merit. The experimental results provide demonstration of proof of principle for the theoretical model which predicts a large enhancement in the thermoelectric figure of merit for superlattice quantum wells with small widths. Thermoelectric transport properties are measured as a function of temperature. An enhancement of S/sup 2/n within the quantum well over the bulk value is observed experimentally, where S is the Seebeck coefficient and n is the carrier density.

关键词： Thermoelectricity Temperature Superlattices Buffer layers physics Materials science and technology Potential well Quantum mechanics Radioactive materials Thermoelectric devices

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Advances in 1D and 2D thermoelectric materials

Advances in 1D and 2D thermoelectric materials

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International Conference on Thermoelectrics (ICT)

作者： M.S. Dresselhaus Y.M. Lin G. Dresselhaus X. Sun Z. Zhang S.B. Cronin T. Koga J.Y. Ying Dept. of Phys. MIT Cambridge MA USA Department of Electrical Engineering and Computer Science Cambridge MA USA Francis Bitter National Magnet Laboratory Cambridge MA USA Departmentof Physics Cambridge MA USA Division of Engineering and Applied Sciences Harvard University Cambridge MA USA Department of Chemical Engineering MIT Cambridge MA USA

Recent advances in our understanding of 1D and 2D thermoelectric materials in the form of quantum wires (1D) and quantum wells (2D) are reviewed, with emphasis given to the physical mechanisms responsible for the enhanced thermoelectric figure of merit (ZT) in these low dimensional systems. Starting with 2D superlattices, progress in demonstrating proof-of-principle in the PbTe/Pb/sub 1-x/Eu/sub x/Te and Si/Si/sub 1-x/Ge/sub x/ systems is presented. The concept of carrier pocket engineering regarding improved thermoelectric performance for the whole superlattice Z/sub 3D/T, including both the quantum well and the barrier region, is reviewed. Particular attention is given to recent results obtained for 1D bismuth nanowire arrays and for individual Bi nanowires.

关键词： Thermoelectricity Conducting materials Quantum mechanics Magnetic materials Superlattices Bismuth Thermal conductivity Quantum dots Quantum computing Wires

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An agent-based infrastructure for enterprise integration

An agent-based infrastructure for enterprise integration

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International Symposium on Agent Systems and Applications. International Symposium on Mobile Agents

作者： R.S. Cost T. Finin Y. Labrou Xiaocheng Luan Yun Peng I. Soboroff J. Mayfield A. Boughannam Laboratory for Advanced Information Technology Department of Computer Science and Electrical Engineering University of Maryland Baltimore County Baltimore MD USA Research and Technology Development Center Johns Hopkins University-Applied Physics Laboratory Laurel MD USA Advanced Manufacturing Solutions Development IBM Corporation Boca Raton FL USA

Some of the features that make Jackal (Java-based Applications Communication using KQML Agent communication Language) extremely valuable to agent development are its conversation management facilities, its flexible, blackboard-style interface and its ease of integration. Jackal has been developed in support of an investigation of the use of agents in enterprise-wide integration of planning and execution for manufacturing. This paper describes Jackal at a surface level and at the design level, and demonstrates its use in a multi-agent system that supports intelligent integration of enterprise planning and execution.

关键词： Java Virtual machining Laboratories Costs Information technology computer science physics computer aided manufacturing Intelligent systems Intelligent agent

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