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IEEE Photonics Conference (IPC)

作者： H. Feng R.L. Thombley W.J. Lennon J.P. Heritage Advanced Telecommunications Program Lawrence Livemore National Laboratory Livermore CA USA Department of Electrical and Computer Engineering University of California Davis CA USA

The National Transparent Optical Network (NTON) is co-funded by the Defense Advanced Research Projects Agency (DARPA) and the National Transparent Optical Network Consortium (NTONC). Members of the NTONC include Nortel Networks, GST Telecommunications, Lawrence Livermore National Laboratories (LLNL), Sprint Communications and the Bay Area Rapid Transit District (BART). NTON provides a 10+ Gb/s open research platform for Next Generation Internet (NGI) trials. NTON is a 2000 km 10-20 Gb/s wavelength division multiplexed (WDM) network deployed using in-place commercial fiber. NTON links reach government, university and private sector labs and provide the ability to interface with most of the broadband research networks in the US. Planned interchange networks are: ATDnet, HSCC, DREN, NREN, ESnet, vBNS, SVTT, Abilene, Canarie, CalREN, and others. NTON will simultaneously support device design R&D, network R&D and testing of high bandwidth enabled applications. NTON provides direct access to nearly all of the major universities on the West Coast at data rates up to, and potentially beyond, 2.5 Gb/s. NTON will also connect major West Coast supercomputer sites, digital libraries, high energy physics labs and medical research institutions.

关键词： Optical fiber networks Wavelength division multiplexing Laboratories Internet WDM networks Optical fiber communication Optical fiber devices US Government Testing Bandwidth

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Performance of turbo trellis-coded modulation (T-TCM) on frequency-selective Rayleigh fading channels

Performance of turbo trellis-coded modulation (T-TCM) on fre...

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IEEE International Conference on Communications (ICC)

作者： Hguye Hoang Ha R.M.A.P. Rajatheva Department of Electrical and Computer Engineering University of Manitoba Winnipeg MAN Canada Telecommunication Program School of Advanced Technologies Asian Institute of Technology Pathum Thani Thailand

Turbo trellis-coded modulation (T-TCM) is one of several techniques for combining turbo codes with multilevel modulation in order to save the bandwidth of the transmission systems. T-TCM was shown to perform very well on AWGN channels, but its performance over frequency-selective fading channels is unknown. In this paper, a system model to investigate the performance of T-TCM schemes over frequency-selective fading channels is proposed. Simulation results show that when an appropriate receiver is available, T-TCM also performs well on frequency-selective fading channels. T-TCM performance is much better than any other coded-modulation scheme for this type of channel.

关键词： Frequency modulation Fading Turbo codes Modulation coding Iterative decoding Bandwidth AWGN channels Bit error rate Filters Iterative algorithms

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Robust filtering with guaranteed energy-to-peak performance — an LMI approach

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IFAC Proceedings Volumes 1999年第2期32卷 1814-1819页

作者： Reinaldo M. Palhares Pedro L.D. Peres Pontifícia Universidade Católica de Minus Gerais Graduate Program in Electrical Engineering Av. Dom José Gaspar 500 Prédio 4 30535-610 Belo Hotizonte - MG - Brazil School of Electrical and Computer Engineering University of Campinas DT/FEEC/UNICAMP - CP 6101 13.081-970 Campinas - SP - Brazil

The problem of robust energy-to-peak filtering for linear systems with convex bounded uncertainties is investigated in this paper. The main purpose is to design a full order stable linear filter that minimizes the worst-case peak value of the filtering error output signal with respect to all bounded energy inputs, in such way that the filtering error system remains quadratically stable Necessary and sufficient conditions arc formulated in terms of Linear Matrix Inequalities - LMIs, for both continuous- and discrete-time cases.

关键词： Robust Estimation Filter Design Uncertain Linear Systems Convex programming Energy-to-Peak Gain Linear- Matrix Inequalities

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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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Robust H/sub /spl infin// filter design for uncertain discrete-time state-delayed systems: an LMI approach

Robust H/sub /spl infin// filter design for uncertain discre...

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IEEE Conference on Decision and Control

作者： R.M. Palhares C.E. De Souza P.L.D. Peres Graduate Program in Electr. Eng. Pontifical Catholic Univ. of Minas Gerais Belo Horizonte Brazil Laboratório Nacional de Computação Científica-LNCC Petropolis Rio de Janeiro Brazil School of Electrical and Computer Engineering State University of Campinas-UNICAMP Sao Paulo Brazil

The problem of robust H/sub /spl infin// filtering for discrete-time uncertain linear systems with multiple state delays is addressed. The uncertain parameters are supposed to belong to a given convex bounded polyhedral domain. Sufficient conditions for the existence of a stable linear filter assuring stability and a prescribed H/sub /spl infin// performance for the filtering error system for all allowed uncertainties are established in terms of linear matrix inequalities. Efficient numerical algorithms can be used to solve the problem, as illustrated via an example.

关键词： Robustness Filters Filtering Noise level Attenuation Noise measurement Signal processing Stability Delay Symmetric matrices

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Comparative study of back surface field contact formation using different lamp configurations in rapid thermal processing

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Journal of Vacuum Science & Technology B: Microelectronics Processing and Phenomena 1998年第2期16卷 613-613页

作者： Singh, R. Vedagarbha, V. Nimmagadda, S.V. Narayanan, S. Department of Electrical and Computer Engineering and Materials Science and Engineering Program Clemson University Clemson South Carolina 29631-0915 Department of Electrical and Computer Engineering Clemson University Clemson South Carolina 29631-0915 Solarex Corporation 630 Solarex Court Frederick Maryland 21701

In this article, we have studied the role of photoeffects in the formation of aluminum back surface field (BSF) contacts on p-type silicon wafers by using different lamp configurations in rapid thermal processing (RTP). Use of photons of wavelengths less than 800 nm in conjunction with infrared and visible photons in RTP resulted in the reduction of processing time from 202 to 138 s and the processing temperature from 890 to 850 °C. The reduction in the overall thermal budget used for BSF contact formation is a direct result of photon assisted RTP. The availability of a large number of high energy photons on the metal surface also resulted in improved electrical, structural and mechanical properties of the processed device.

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Multiwavelength integrated 2 × 2 optical cross-connect switch and lambda-partitioner with 2 × N phased-array waveguide grating in self-loopback configuration

Multiwavelength integrated 2 × 2 optical cross-connect swit...

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1998 Optical Fiber Communication Conference, OFC 1998

作者： Li, Haifeng Lee, Chau-Han Zhong, Shan Chen, Yung Jui Dagenais, M. Stone, D. Department of Computer Science and Electrical Engineering University of Maryland Baltimore County Joint Program for Advanced Electronic Materials 1000 Hilltop Circle BaltimoreMD21250 United States

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A comparison of ada and pascal in an introductory computer science course 98

A comparison of ada and pascal in an introductory computer s...

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1998 Annual ACM SIGAda International Conference on Ada, SIGAda 1998

作者： Murtagh, Jeanne L. Hamilton, John A. Software Professional Development Program Air Force Institute of Technology Wright-Patterson AFBOH45433-7765 United States US Army D/Electrical Engineering and Computer Science United States Military Academy West PointNY10996-1787 United States

ISBN: (纸本)1581130333

Pascal's long and successful run at West Point illustrated Winston Churchill's dictum that, "The absence of alternatives clears the mind wonderfully." However, by the mid-90s, the United States Military Academy was finding that Pascal, long the educational workhorse, was no longer the clear choice for serious computer science education. The decision was taken to evaluate alternatives to Pascal. The criteria selected for programming language evaluation were student learning outcomes based on course goals and objectives. The controlled educational environment of a service academy provides an excellent opportunity to conduct research using control groups and experimental groups. We conducted a side by side comparison of the use of Pascal, which was specifically designed for instructional purposes, and Ada in an introductory course. The experiment demonstrated that students were much more successful in Ada than in Pascal, and led to the revision of the Academy core curriculum to use Ada 95 in our introductory computer science class. This paper discusses the details of our comparison, citing specific examples to illustrate a rational basis for evaluating programming language features against course objectives.

关键词： Students

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Floating-gate CMOS analog memory cell array

Floating-gate CMOS analog memory cell array

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： R.R. Harrison P. Hasler B.A. Minch Computation and Neural Systems Program 139-74 California Institute of Technology NASA Pasadena CA USA Department of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA School of Electrical Engineering Cornell University Ithaca NY USA

The complexity of analog VLSI systems is often limited by the number of pins on a chip rather than by the die area. Currently, many analog parameters and biases are stored off chip. Moving parameter storage on chip could save pins and allow us to create complex programmable analog systems. In this paper, we present a design for an on-chip non-volatile analog memory cell that can be configured in addressable arrays and programmed easily. We use floating-gate MOS transistors to store charge, and we use the processes of tunneling and hot-electron injection to program values. We achieve greater than 13-bit precision with no crosstalk between memory cells.

关键词： Nonvolatile memory Analog memory Pins Voltage Potentiometers Tunneling Very large scale integration Secondary generated hot electron injection Analog computers CMOS technology

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A new estimation formula for minimum filter length of optimum FIR digital filters

A new estimation formula for minimum filter length of optimu...

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International Conference on Signal Processing Proceedings (ICSP)

作者： K. Ichige M. Iwaki R. Ishii Doctoral Program in Engineering University of Tsukuba Tsukuba Ibaraki Japan Japan Advanced Institute of Science and Technology Tatsunokuchi Ishikawa Japan Division of Electrical and Computer Engineering Yokohama National University Yokohama Japan

This paper presents an accurate estimation formula for the minimum filter length of optimum (the minimax criterion-based) FIR low-pass digital filters. The authors have proposed an accurate estimation formula for the particular case that the passband and stopband ripples are identical. Now we expand the formula for the general case. The accuracy of the proposed formula is evaluated in comparison with that of the conventional formulae. We also describe how to apply the proposed formula for the design of other types of filters.

关键词： Digital filters Finite impulse response filter Low pass filters Design optimization Algorithm design and analysis Iterative algorithms Passband Cutoff frequency Minimax techniques Iterative methods

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