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Device Research Conference

作者： Ho-Young Cha Xiaodong Chen W.J. Schaff M.G. Spencer L.F. Eastman B.K. Ridley J. Pomeroy M. Kuball School of Electrical and Computer Engineering and Cornell Nanoscale Science and Technology Facility Cornell University Ithaca NY USA Department of Electronic Systems Engineering University of Essex Colchester United Kingdom Department of Physics University of Bristol Bristol United Kingdom Department of Physics University of Bristol Bristol BS8 ITL United Kingdom

In order to achieve operation at terahertz frequency, electronic devices are required to reach the highest possible transit velocity, even if this velocity is limited to a short distance. The concept of ballistic electrons in compound semiconductors was initially reported using GaAs (Shur and Eastman, 1979). In this work, progress in initial research on GaN based ballistic electron acceleration negative-differential-conductivity (BEAN) diodes for potential THz oscillator is reported along with their device concepts

关键词： III-V semiconductor materials Gallium nitride Electrons Acceleration Effective mass Temperature Thermal conductivity Semiconductor diodes Performance evaluation Current density

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Classical and quantum information processing using EIT

Classical and quantum information processing using EIT

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Frontiers in Optics, FiO 2005

作者： Beausoleil, R.G. Briggs, G.A.D. Jones, M.A.G. Kumar, P. Munro, W.J. Santori, C.M. Shahriar, Selim M. Spillane, S.M. Spiller, T.P. Walmsley, I.A. Hewlett-Packard Laboratories 1501 Page Mill Rd. MS 1123 Palo Alto CA 94304-1100 United States Department of Materials Oxford University Parks Road Oxford OX1 3PH United Kingdom Department of Electrical and Computer Engineering Northwestern University 2145 Sheridan Road Evanston IL 60208-3118 United States Hewlett-Packard Laboratories Filton Road Stoke Gifford Bristol BS34 8QZ United Kingdom Clarendon Laboratory Oxford University Parks Road Oxford OX1 3PU United Kingdom

We review our progress towards the observation of weak quantum optical nonlinearities in condensed matter systems. In particular, we discuss results of spectroscopic experiments conducted using nitrogen-vacancy color ... 详细信息

ISBN: (纸本)1557527970

关键词： Color centers

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ICBR – multimedia management system for intelligent content based retrieval

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3rd International Conference on Image and Video Retrieval, CIVR 2004

作者： Ćalić, Janko Campbell, Neill Mirmehdi, Majid Thomas, Barry T. Laborde, Ron Porter, Sarah Canagarajah, Nishan Department of Computer Science University of Bristol Merchant Venturers Building Woodland Road BristolBS8 1UB United Kingdom Department of Electrical and Electronic Engineering University of Bristol Merchant Venturers Building Woodland Road BristolBS8 1UB United Kingdom

ISBN: (纸本)3540225390

This paper presents a system designed for the management of multimedia databases that embarks upon the problem of efficient media processing and representation for automatic semantic classification and modelling. Its objectives are founded on the integration of a large-scale wildlife digital media archive with a manually annotated semantic metadata organised in a structured taxonomy and media classification system. Novel techniques will be applied to temporal analysis, intelligent key-frame extraction, animal gait analysis, semantic modelling and audio classification. The system demonstrator will be developed as a part of an ICBR project within the 3C Research programme of convergent technology research for digital media processing and communications. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Digital storage

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Quasicyclic low-density parity check codes

Quasicyclic low-density parity check codes

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6th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service, TELSIKS 2003

作者： Vasic, Bane Djordjevic, Ivan B. University of Arizona Department of Electrical and Computer Engineering Tucson AZ 85721 United States University of Bristol Department of Electrical and Electronic Engineering Optical Communications Research Group Bristol BS8 ITR United Kingdom

ISBN: (纸本)0780379632

This paper introduces a combinatorial construction of regular low-density parity check (LDPC) codes based on balanced incomplete block designs, or more specifically on cyclic difference families of Abelian groups and affine geometries. Several constructions are presented, and the bounds on minimal distance are derived by using the concept of Pasch configurations. © 2003 IEEE.

关键词： Satellite communication systems

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Multiweight unipolar codes for multimedia optical CDMA applications based on pairwise balanced designs

Multiweight unipolar codes for multimedia optical CDMA appli...

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6th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service, TELSIKS 2003

作者： Djordjevic, Ivan B. Vasic, Bane Rorison, Judy University of Bristol Department of Electrical and Electronic Engineering Optical Communications Research Group Queen's Building Bristol BS8 ITR United Kingdom University of Arizona Department of Electrical and Computer Engineering Tucson AZ 85721 United States

A novel class of constant-length variable-weight optical orthogonal codes is proposed with good correlation properties suitable to support multimedia services with different data rates and quality-of-service requireme... 详细信息

ISBN: (纸本)0780379632

关键词： Multimedia services

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Design & application of LTCC materials for slow-wave periodic CPW filters

Design & application of LTCC materials for slow-wave periodi...

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作者： Kollman, D.T. Drayton, R.F. Amey, D.I. Mobley, T.P. Vannetvelde, G. Department of Electrical and Computer Engineering University of Minnesota 200 Union Street Southeast Minneapolis MN 55455 United States Du Pont Microcircuit Materials 14 T.W. Alexander Drive Research Triangle Park NC 27709 United States Du Pont Microcircuit Materials Coldharbour Lane Bristol BS16 1QD United Kingdom

The design of a 10 GHz low pass, low loss, slow-wave CPW periodic filter after Sor et al. was implemented using two Low Temperature Cofired Ceramic (LTCC) dielectric materials (951 and 943 Green Tape™) with gold and silver screen printed and Fodel® photopatterned cofired and post fired conductors. The material tradeoffs are reviewed and the test results compared to circuit simulations performed using SONNETÆ software. Comparisons and discussion of filter performance for the material and patterning variations are made.

关键词： Low pass filters

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Human systems integration and advanced technology in engineering department workload and manpower reduction

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NAVAL ENGINEERS JOURNAL 2003年第1期115卷 57-65页

作者： Lively, KA Seman, AJ Kirkpatrick, M KENNETH A. LIVELY graduated from the University of Colorado with a BS in applied mathematics and an MS in mathematics in 1976 and from the Massachusetts Institute of Technology with an MS in electrical engineering and the degree ocean engineer in naval architecture and marine engineering in 1984. He retired from the U.S. Navy in 1989 after 23 years of service. Assignments included electrical officer on the USS Constellation (CV 64) project engineer for the DDG 51 machinery control system (NAVSEA) and DDG 51 Technical Director (NAVSEA). He was vice president of the PDI Division of Bird-Johnson Company from July 1989 to November 1998 where he managed various gas turbine and machinery controls related development projects. He joined Anteon Corporation's Systems Engineering Group as senior controls engineer in December 1998 where he provided technical support to the integrated power systems program (NAVSEA PMS 510) and managed the Office of Naval Research Afloat Laboratory. DR. MARK KIRKPATRICK is currently an independent consultant in human factors and work-load/manning analysis and modeling. He holds a Ph.D. degree in experimental psychology from The Ohio State University and has 34 years of experience in applied human factors. From 1982 through 2000 Dr. Kirkpatrick served as the senior vice president of Carlow International. Prior to joining Carlow in 1982 Dr. Kirkpatrick served as a member of the technical staff at North American Rockwell's Missiles Division and as a project director and vice president for Essex Corporation. His areas of expertise include workload simulation task analysis operator-in-the-loop simulation human performance experimentation statistical analysis and human factors T&E. He has directed and/or participated in human factors projects for the U.S. Navy U.S. Army NASA Department of Transportation the U.S. Nuclear Regulatory Commission and private industry. ANTHONY J. SEMAN III is the technical manager for the reduced ship's crew by virtual presence (RSVP) advanced technology d

Aboard current ships, such as the DDG 51, engineering control and damage control activities are manpower intensive. It is anticipated that, for future combatants, the workload demand arising from operation of systems under conditions of normal steaming and during casualty response will need to be markedly reduced via automated monitoring, autonomous control, and other technology initiatives. Current DDG 51 class ships can be considered as a manpower baseline and under Condition III typical engineering control involves seven to eight watchstanders at manned stations in the Central Control Station, the engine rooms and other machinery spaces. In contrast to this manning level, initiatives such as DD 21 and the integrated engineering plant (IEP) envision a partnership between the operator and the automation system, with more and more of the operator's functions being shifted to the automation system as manning levels decrease. This paper describes some human systems integration studies of workload demand reduction and, consequently, manning reduction that can be achieved due to application of several advanced technology concepts. Advanced system concept studies in relation to workload demand are described and reviewed including. Piecemeal applications of diverse automation and remote control technology concepts to selected high driver tasks in current DDG 51 activities. Development of the reduced ship's crew by virtual presence system that will provide automated monitoring and display to operators of machinery health, compartment conditions, and personnel health. The IEP envisions the machinery control system as a provider of resources that are used by various consumers around the ship. Resource needs and consumer priorities are at all times dependent upon the ship's current mission and the availability of equipment pawnbrokers.

关键词： Naval warfare

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Micromagnetic behavior of electrodeposited cylinder arrays

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Physical Review B 2002年第14期65卷 144417-144417页

作者： C. A. Ross M. Hwang M. Shima J. Y. Cheng M. Farhoud T. A. Savas Henry I. Smith W. Schwarzacher F. M. Ross M. Redjdal F. B. Humphrey Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139 Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge Massachusetts 02139 Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts 02139 H. H. Wills Physics Laboratory University of Bristol Bristol BS8 1TL United Kingdom IBM T. J. Watson Research Center Yorktown Heights New York 10598 Department of Electrical and Computer Engineering Boston University Boston Massachusetts 02215

Arrays of cylindrical magnetic particles have been made using interference lithography combined with electrodeposition. The cylinders are made from Ni, Co, CoP, or CoNi, with diameters of 57–180 nm, aspect ratios of 0.4–3, and array periods of 100–200 nm. The remanent states of the cylinders correspond to single-domain “flower” states or to magnetization vortices depending on the particle size and aspect ratio. Experimental data are in good agreement with a magnetic-state map calculated using a three-dimensional micromagnetic model, which shows the remanent state as a function of particle size and aspect ratio. The interactions between the particles, and their switching-field distribution, have been quantified.

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Low-power technology mapping for mixed-swing logic 01

Low-power technology mapping for mixed-swing logic

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Proceedings of the 2001 international symposium on Low power electronics and design

作者： Rob A. Rutenbar L. Richard Carley Roberto Zafalon Nicola Dragone Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA STMicroelectronics Agrate (MI) Italy Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA and PDF Solutions Desenzano (BS) Italy

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Applying evolutionary programming to robust control systems design and analysis

Applying evolutionary programming to robust control systems ...

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1999 Congress on Evolutionary Computation, CEC 1999

作者： Cao, Y.J. Wu, Q.H. Intelligent Computer Systems Centre University of the West of England Bristol BS16 lQY United Kingdom Dept. of Electrical Engineering and Electronics Universityof Liverpool Liverpool L69 3GJ United Kingdom

ISBN: (纸本)0780355369

An evolutionary programming (EP) approach to designing robust controllers for parametric uncertain systems has been developed. The approach is expedited through the use of an overbounding interval plant representation of the original plant. The design of a robust controller is transformed into solving an eigenvalue optimization problem, which involves optimizing the maximum real part of eigenvalues of the characteristic polynomial for the uncertain plant. Several examples including a practical flywheel-shaft-flywheel system are presented to show that the proposed approach can achieve the global or near-global optimal solutions by performing the evolutionary operations, which is crucial to designing robust controllers and determining the stability of uncertain control systems. © 1999 IEEE.

关键词： Global optimization

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