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Correction to "A Bioelectric Inverse Imaging Technique Based On Surface Laplacians"

IEEE Transactions on Biomedical engineering 1997年第11期44卷 1163-1163页

作者： Bin He Dongsheng Wu Department of Electrical Engineering and Computer Scince and Bioengineering Program University of Illinois Chicago Chicago IL USA Bioengineering Program University of Illinois Chicago Chicago IL USA

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Operational systems, logistics engineering and technology insertion

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 205-220页

作者： Grubb, MJ Skolnick, A Michael J. Grubb:has perfomzed naval engineering at the Crane Division Naval Surface Warfare Center (NSWC) for more than twenty-five years. He currently the program manager for the Sustainable Hardware and Affordable Readiness Practice Program (SHARP). is a Navy-wide logistics research and development prgram aimed at the successful transiton of proved technologies inot the fleet. SHARP focuses on reducing acquisition performance capability reliability maintainability and readiness of these systems. Mr. Grubb has served as a department director for the past eleven years. His most recent assignment was as director of the Tactical Computer Resources and Test Equipment Department. This organization provided acquisition and in-service engineering support of the Navy's tectical embedded computers priphirals displays and mass memory storage devices. The organization also provided a complete range of product engineering and metrology engineerig services for SSP NevSeaSysCom and the Trident Program. Prior to this appointment Mr. Grubb was deptuy director psysical security programs department and site responsible for program management and system integration of ashore integrated security systems. Mr. Grubb holds a B.S. degree in industrial engineering from Iowa State Universtiy an M.S. degree in industrial engineering from Purdue University and has copleted the course work (Dec.'96 for a master's degree in public and environment affairs at Indiana University-Purdue Univeristy Indianapolis. Dr. Alfred Skolnick operates System Science Consultants (SSC) specilizing in strategic planning technical program definiton technology assessment and engineering analyses on selected matters of national interest. He has taught physics mathematics and management sciences at University of Virginia and Marymount University and is currently adjunct professor of mathematics at Northern Virginia Community College. Form 1985 to 1989 he was president of the American Society of Noval Engineers. Dr. Skolnick served at Applied Physic

In an era of fiscal austerity, downsizing and unforgiving pressure upon human and economic capital, it is an Augean task to identify resources for fresh and creative work. The realities of the day and the practical demands of more immediate fleet needs can often dictate higher priorities. Yet, the Navy must avoid eating its seed corn. Exercising both technical insight and management foresight, the fleet, the R&D community, the Office of the Chief of Naval Operations (OpNav) and the product engineering expertise of the Naval Surface Warfare Center (NSWC) are joined and underway with integrated efforts to marry new, fully demonstrated technologies and operational urgencies. Defense funding today cannot sponsor all work that can be mission-justified over the long term because budgets are insufficient to support product maturation within the classical development cycle. However, by rigorous technical filtering and astute engineering of both marketplace capabilities and currently available components, it is possible in a few select cases to compress and, in effect, integrate advanced development (6.3), engineering development (6.4), weapon procurement (WPN), ship construction (SCN), operation and maintenance (O&M,N) budgetary categories when fleet criticalities and technology opportunities can happily meet. In short, 6.3 funds can be applied directly to ''ripe gateways'' so modern technology is inserted into existing troubled or aging systems, sidestepping the lengthy, traditional development cycle and accelerating practical payoffs to recurrent fleet problems. To produce such constructive results has required a remarkable convergence of sponsor prescience and engineering workforce excellence. The paper describes, extensively, the philosophy of approach, transition strategy, polling of fleet needs, technology assessment, and management team requirements. The process for culling and selecting specific candidate tasks for SHARP sponsorship (matching operational need with t

关键词： Naval vessels

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Body surface Laplacian mapping from potential recordings in man

Body surface Laplacian mapping from potential recordings in ...

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Southern Biomedical engineering Conference

作者： N. Mehdi X. Yu D. Wu N. Jojic B. Baker P. Gosavi A. Seyd S. Bodak K. Umetani B. He Bioengineering Program University of Illinois Chicago USA Department of Electrical Engineering and Computer Science University of Illinois Chicago USA

Body surface Laplacian maps were studied from a set of unipolar potential data in healthy human subjects. The present results indicate that body surface Laplacian maps can be obtained with high reproducibility in the human subjects studied, and can reveal detailed information regarding the underlying ventricular conduction process.

关键词： Laplace equations Helium Humans Electrodes Electrocardiography Bioelectric phenomena Biomedical engineering Electric potential Board of Directors Reproducibility of results

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Development of a X-window based bioelectric mapping software system

Development of a X-window based bioelectric mapping software...

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Southern Biomedical engineering Conference

作者： X. Yu D. Wu B. He Department of Electrical Engineering and Computer Science University of Illinois Chicago USA Bioengineering Program University of Illinois Chicago USA

The authors have developed a multi-purpose X-window based mapping software system. This software system can be used to analyze and display body surface maps of the Laplacian electrocardiogram, potential electrocardiog... 详细信息

关键词： Bioelectric phenomena Software systems Laplace equations Electric potential Humans Electrocardiography Helium Data analysis Heart Signal processing

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A performance model of space-division ATM switches with input and output queueing 29

A performance model of space-division ATM switches with inpu...

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29th Hawaii International Conference on System sciences, HICSS 1996

作者： Zhang, Guogen Bulgren, William G. Wallace, Victor L. Computer Science Department University of California at Los Angeles Los AngelesCA90024 United States Engineering Management Program University of Kansas LawrenceKS66045 United States Department of Electrical Engineering University of Kansas LawrenceKS66045 United States

ISBN: (纸本)0818673249

An analytic model for the performance evaluation of space-division Asynchronous Transfer Mode (ATM) switches is presented. This model assumes that the switch has a fixed capacity of m, where 12 is given. The result shows that the performance of switches with a small capacity can approach that of output queueing. The model and result can be used for switch design analysis and higher layer performance models. © 1996 IEEE

关键词： Asynchronous transfer mode

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Investigations of Microwave Absorption in Insulating Dielectric Ionic Crystals Including the Role of Point Defects and Dislocations

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MRS Online Proceedings Library 1996年第1期430卷 397-402页

作者： Benjamin D.B. Klein Binshen Meng Samuel A. Freeman John H. Booske Reid F. Cooper Department of Electrical and Computer Engineering University of Wisconsin Madison USA Materials Science Program University of Wisconsin Madison USA Department of Materials Science and Engineering University of Wisconsin Madison USA

A theoretical model of microwave absorption in linear dielectric (non-ferroelectric) ionic crystals that takes into account the presence of point defects was synthesized and verified using NaCl single crystals. In the next stage of this research, we will introduce a controlled density of dislocations into the single crystal NaCl samples and study the effect on the microwave absorption mechanisms (ionic conduction, dielectric relaxation and multi-phonon processes) both theoretically and experimentally. Qualitative outlines of this modified theory are presented. The loss factor ε’ has been measured in the dislocation-free case by a cavity resonator insertion technique and the experimental results are in good agreement with the theoretical model. We describe the sample preparation technique that will be used to produce a controlled dislocation density in single crystal samples that will also be studied in our cavity resonator insertion system.

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Statistical Comparative Analyses of engineering Properties of Microwave and Conventionally Sintered Alumina

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MRS Online Proceedings Library 1996年第1期430卷 453-458页

作者： K.R. Binger S.A. Freeman D.J. Grellinger R.F. Cooper J.H. Booske Department of Electrical and Computer Engineering University of Wisconsin - Madison Madison USA Material Science Program University of Wisconsin - Madison Madison USA Department of Material Science and Engineering University of Wisconsin - Madison Madison USA

Processing conditions such as temperature, soak time, and heating rate affect the final density of conventionally-sintered and microwave-sintered ceramics. Of additional importance is the question of whether microwave-sintered ceramics display intrinsically superior macroscopic engineering properties compared with conventionally-sintered control specimens. An analysis using the Yates algorithm indicates that the processing condition which has the largest impact on the density of the specimen is the heating method (microwave vs. conventional). The microwave-sintered specimens resulted in higher densities and higher fracture strengths. However, it was determined that the higher fracture strengths were due to the higher sintered densities rather than a significantly different microstructure.

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A performance model of space-division ATM switches with input and output queueing

A performance model of space-division ATM switches with inpu...

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Annual Hawaii International Conference on System sciences (HICSS)

作者： Guogen Zhang W.G. Bulgren V.L. Wallace Computer Science Department University of California Los Angeles Los Angeles CA USA Engineering Management Program University of Kansas Lawrence KS USA Department of Electrical Engineering and Computer Science University of Kansas Lawrence KS USA

An analytic model for the performance evaluation of space-division asynchronous transfer mode (ATM) switches is presented. This model assumes that the switch has a fixed capacity of m, where 1/spl les/m/spl les/N (N is the number of trunks). Other important parameters include arrival rate and buffer sizes. Numerical solutions for the maximum throughput, cell delay, and cell loss probability are given with simulation being utilized in order to validate the analytic model. For independent and identical Bernoulli arrivals, the study shows that the contention processes can be modeled as discrete M/D/m (FIFO or Random) queues, while input queues can be modeled by Geom/G/1 queues, and the output queues are G/sup [X]//D/1 queues. A closed-form approximation for cell delay when m>2 is given. The result shows that the performance of switches with a small capacity can approach that of output queueing. The model and result can be used for switch design analysis and higher layer performance models.

关键词： Asynchronous transfer mode Switches Performance analysis Fabrics Communication switching Queueing analysis Throughput Delay computer science Performance loss

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Measurement of absorption and scattering spectra with oblique incidence reflectometry

Measurement of absorption and scattering spectra with obliqu...

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Biomedical Optical Spectroscopy and Diagnostics, BOSD 1996

作者： Lin, Shao-Pow Wang, Lihong Jacques, Steven L. Tittel, Frank K. Department of Electrical and Computer Engineering Rice University P.O. Box 1892 HoustonTX77251 United States Laser Biology Research Laboratory University of Texas M.D. Anderson Cancer Center Box 17 1515 Holcombe Blvd. HoustonTX77030 United States Bioengineering Program Texas A&M University 234C Zachry Engineering Center College StationTX77843 United States

ISBN: (纸本)1557524270

Fiber optic oblique incidence reflectometry has been demonstrated to be a simple and accurate method for measuring the optical properties, μa and μs', of turbid media such as biological tissues [1,2]. After sampling the spatial distribution of diffuse reflectance of obliquely incident light, we can a) measure the shift in the center of diffuse reflectance, which is proportional to the diffusion coefficient of the medium (D), and b) fit the distribution to a diffusion theory model to determine the effective attenuation coefficient (μeff). μa and μs' can be calculated directly from these two parameters. This paper presents preliminary results that show that both absorption and reduced scattering spectra can be deduced from multi-spectral measurements of the relative diffuse reflectance profile of white light obliquely incident on tissue phantoms. © 1996 Optical Society of America.

关键词： Incident light

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A nonstationary analysis of bandwidth access control schemes for heterogeneous traffic in B-ISDN

A nonstationary analysis of bandwidth access control schemes...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： Yi Qian D. Tipper D. Medhi Department of Electrical and Computer Engineering Clemson University Clemson SC USA Telecommunications Program Department of Information Science University of Pittsburgh Pittsburgh PA USA Department of Computer Networking University of Missouri Kansas City Kansas City MO USA

We present a comparative analysis of bandwidth access control schemes under nonstationary traffic conditions for heterogeneous circuit-mode traffic offered to a B-ISDN network link. A unified model for analysing the behavior of several bandwidth access control schemes is developed using a Markov process model with acceptance functions. Numerical techniques are used to solve the associated Chapman-Kolmogorov equations and determine the nonstationary behavior. Performance results are given for several common bandwidth access control schemes, namely: complete sharing, complete partitioning, partial sharing, classical trunk reservation, and the probabilistic reservation policy. It is shown that the use of the average arrival rate to estimate the average connection blocking rate may be an underestimate for a system with a time varying arrival process. Also, it is found that a nonstationarity in one traffic class arrival process can impact other stationary traffic classes and the degree of variability depends on the particular access control scheme.

关键词： Bandwidth Access control B-ISDN Traffic control Communication system traffic control Circuits Queueing analysis Markov processes Information analysis Cities and towns

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