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A NOTE ON THE POLYNOMIAL REPRESENTATION OF BOOLEAN FUNCTIONS OVER GF(2)

International Journal of Foundations of computer Science 1999年第4期10卷 535-542页

作者： RICHARD BEIGEL ANNA BERNASCONI Dept. of Electrical Engineering and Computer Science University of Illinois at Chicago (M/G 154) 851 S Morgan St Fl 11 Chicago IL 60607-7053 USA Supported in part by NSF grants CCR-9996021 and CCR-9877150. Also with DIMACS. DIMACS is a cooperative project of Rutgers University Princeton University AT&T Bell Laboratories and Telcordia. DIMACS is an NSF Science and Technology Center funded under constract STC-91-19999 and also receives support from the New Jersey Commission on Science and Technology. Lehrstuhl Effiziente Algorithmen Institut für Informatik Technische Universität München D-80290 München Germany

We investigate the representation of Boolean functions as polynomials over the field GF(2), and prove an interesting characteriztion theorem: the degree of a Boolean function over GF(2) is equal to the size of its largest subfunction that takes the value 1 on an odd number of input strings. We then present some properties of odd functions, i.e., functions that take the value 1 on an odd number of strings, and analyze the connections between the problem of the existence of odd functions with very low maximal sensitivity and the long standing open problem of the relationship between the maximal sensitivity and the block sensitivity of Boolean functions.

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Healthcare Informatics Society of Ireland

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Irish Journal of Medical Science 1999年第4期168卷 276-282页

作者： Rigby, M. Sheridan, A. Draper, R. Stephens, G. Gaffney, P. Grimson, J. Avalos, G. Comerford, F. R. Kanagaratnam, B. Dineen, B. Hamilton, I. Jung, B. Felton, E. Berry, D. Grimson, W. Rice, D. H. Healy, M. Bruce, A. Kelly, J. Carroll, T. Grogan, A. Hurl, G. A. Hyland, D. Roberts, J. Brazil, J. Callanan, I. Devitt, A. O’Brien, T. O’Sullivan, U. M. Peyton, K. Wilson, M. J. Collins, R. Crawley, L. Foley, D. Strachan, H. McBrearty, P. Murnane, R. Murphy, E. Keane, V. Mulvany, F. Sweeney, P. D. Kenny, D. O’Connell, P. R. Balfe, P. Minogue, G. Centre for Health Planning & Management Keele University Keele Staffordshire Britain St. John of God Hospital Stillorgan Hospitaller Order of St. John of God Stillorgan Dept. of Computer Science Trinity College Dublin Clinical Chemistry Laboratory Tallaght Hospital Tallaght Dublin 24 Department of Experimental Medicine Faculty of Medicine National University of Ireland Galway Department of Health Promotion Faculty of Medicine National University of Ireland Galway School of Control Systems & Electrical Engineering Dublin Institute of Technology Ireland Shared Medical Systems Malvern USA Healy Services Dublin Universal Learning Systems Ltd. Dublin The Rotunda Hospital Dublin Mater Misericordiae Hospital Dublin Institute for Healthcare Informatics Dublin First Consulting Group Macclesfield Britain Virus Reference Laboratory UCD Belfield Dublin 4 Cappagh Orthopaedic Hospital Dublin Ireland Southern Health Board Cork Mater Misericordiae Hospital Dublin 7 DSS Dublin Ltd. Ireland University College Dublin Ireland Mary Aikenhead School of Nursing St. Vincent’s Hospital Dublin Blackrock Clinic Dublin Borders Community Health Services NHS Trust Britain James Connolly Memorial Hospital Blanchardstown Dublin 15 Kildare and West Wicklow Mental Health Service for People with A Learning Disability Eastern Health Board Dublin Health Research Board Dublin General Practice Research Unit The Medical Centre Dungloe Dept. of Clinical Biochemistry Our Lady’s Hospital for Sick Children Crumlin Dublin 12

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Quantitative analysis of MR brain image sequences by adaptive self-organizing finite mixtures

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Journal of VLSI Signal Processing systems for Signal, Image, and Video technology 1998年第3期18卷 219-239页

作者： Wang, Yue Adali, Tülay Lau, Chi-Ming Kung, Sun-Yuan Department of Electrical Engineering Catholic University of America Washington DC 20064 Department of Radiology Georgetown University Medical Center Washington DC 20007 Department of Computer Science Univ. of Maryland Baltimore County Baltimore MD 21250 Department of Electrical Engineering Princeton University Princeton NJ 08544 Department of Electrical Engineering Catholic University of America Department of Radiology Georgetown University Medical Center Department of Electrical Engineering Univ. of Maryland Baltimore County Baltimore Info. Sci. and Imaging Syst. Center Georgetown University Medical Center Amdahl Corporation Sunnyvale CA Dept. of Elec. Engineering-Systems University of Southern California LA Stanford University Delft University of Technology Waseda University Tokyo Japan Department of Electrical Engineering Princeton University

This paper presents an adaptive structure self-organizing finite mixture network for quantification of magnetic resonance (MR) brain image sequences. We present justification for the use of standard finite normal mixture model for MR images and formulate image quantification as a distribution learning problem. The finite mixture network parameters are updated such that the relative entropy between the true and estimated distributions is minimized. The new learning scheme achieves flexible classifier boundaries by forming winner-takes-in probability splits of the data allowing the data to contribute simultaneously to multiple regions. Hence, the result is unbiased and satisfies the asymptotic optimality properties of maximum likelihood. To achieve a fully automatic quantification procedure that can adapt to different slices in the MR image sequence, we utilize an information theoretic criterion that we have introduced recently, the minimum conditional bias/variance (MCBV) criterion. MCBV allows us to determine the suitable number of mixture components to represent the characteristics of each image in the sequence. We present examples to show that the new method yields very efficient and accurate performance compared to expectation-maximization, K-means, and competitive learning procedures.

关键词： Brain

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AN ASYMPTOTIC APPROACH FOR THE CALCULATION of ELECTROMAGNETIC FIELD COUPLING TO LONG TERMINATED LINES

AN ASYMPTOTIC APPROACH FOR THE CALCULATION of ELECTROMAGNETI...

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2024 ROMA International Symposium on Electromagnetic Compatibility, EMC 1998

作者： Tkachenko, S. Rachidi, F. Ianoz, M. Martynov, L. Radio Research and Development Institute Moscow103064 Russia University of Toronto Dept. of Electrical and Computer Engineering Toronto Canada Montena EMC RossensCH-1728 Switzerland Swiss Federal Institute of Technology Power Systems Laboratory LausanneCH-1015 Switzerland Russian State Committee on Telecommunications and Informatic Moscow103375 Russia

ISBN: (纸本)9798331500016

In this paper, we present and validate an analytical expression for the induced current on a long terminated line, under the thin wire approximation. The coefficients of the analytical expression are determined using a procedure based on the knowledge of the exact solutions for a short line. The length of the short line is independent of the original line length, and therefore the method is very efficient when considering the electromagnetic coupling to very long lines. © 1998 University of Rome a La Sapienza.

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INDIRECT LIGHTNING EFFECTS ON SHORT OVERHEAD LINES

INDIRECT LIGHTNING EFFECTS ON SHORT OVERHEAD LINES

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2024 ROMA International Symposium on Electromagnetic Compatibility, EMC 1998

作者： Rachidi, F. Rubinstein, M. Zweiacker, P. Ianoz, M. Braendli, B. Kaelin, A. University of Toronto Dept. of Electrical and Computer Engineering Canada Montena EMC RossensCH-1728 Switzerland Swisscom R&D BernCH-3000 Switzerland Swiss Federal Institute of Technology Power Systems Laboratory LausanneCH-IOI5 Switzerland Swiss Defense Procurement Agency NEMP Labor AC Zentrum SpiezCH-3700 Switzerland

ISBN: (纸本)9798331500016

The aim of this paper is to quantify the lightning-induced distUIbances on short overhead lines. An experimental study was carried out in Camp Blanding in 1995 in which the current induced on a short structure by artificially-initiated lightning was measured. For the considered electrically-short structures, is that the induced signals can be predicted with reasonable accuracy using a simple quasistatic approach. Further experiences conducted in a high voltage laboratory allowed us to propose protective solutions. © 1998 University of Rome a La Sapienza.

关键词： Overhead lines

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Photorefractive phased array beamforming with true-time-delay processing

Photorefractive phased array beamforming with true-time-dela...

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International Topical Meeting on Microwave Photonics (MWP)

作者： A. Kirulata P.E.X. Silveira G. Kriehn S. Weaver K. Wagner Dept. of Electr. & Comput. Eng. Colorado Univ. Boulder CO USA Optoelectronic Computing Systems Center Department of Electrical and Computer Engineering University of Colorado Boulder CO USA

We introduce a new optical approach to the problem of implementing true-time-delay (TDD) beamforming for a large N-element adaptive array that requires only 2 tapped delay lines (TDLs) instead of the conventional N TDLs. This new algorithm, BEAMTAP (Broadband and Efficient Adaptive Method for TTD Array processing) is capable of processing very large phased array radar systems with thousands of receiving elements with GHz of bandwidth. The corresponding digital processing load that would be required to solve such large, broadband adaptive array problems exceeds 10/sup 15/ multiply-accumulate operations per second: well beyond the capability of current electronic systems.

关键词： Phased arrays Photorefractive effect Array signal processing Optical arrays Adaptive optics Optical distortion Optical feedback Adaptive arrays Delay lines Holographic optical components

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A new reconstruction algorithm for Kerr electro-optic measurement of space charge in arbitrary geometries

A new reconstruction algorithm for Kerr electro-optic measur...

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Conference on electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： A. Ostundag T.J. Gung M. Zahn Dept. of Electr. Eng. & Comput. Sci. MIT Cambridge MA USA Department of Electrical Engineering and Computer Science Laboratory for Electromagnetic and Electronic Systems Massachusetts Institute of Technology Cambridge MA USA

Recently we used the onion peeling method to reconstruct the axisymmetric electric field distribution of point/plane electrodes from Kerr electro-optic measurements. The method accurately reconstructed the electric field from numerically generated data. However in the presence of experimental noise the performance was less satisfactory. The measurements were especially noisy and unstable near the needle tip which is also the most interesting region since most charge injection occurs here. In this paper we propose a new algorithm for Kerr electro-optic reconstruction of space charge in arbitrary geometries. The algorithm is built on the finite element method for Poisson's equation and will be called the finite element based Kerr electro-optic reconstruction (FEBKER) hereafter. FEBKER is tested on a point/plane like simple artificial axisymmetric geometry. Research is underway for application of the method to actual axisymmetric point/plane experiments. The method is readily extendible to arbitrary three dimensional geometries.

关键词： Reconstruction algorithms Geometry Finite element methods Electrodes Electric variables measurement Current measurement Charge measurement Needles Space charge Poisson equations

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RDRN: a rapidly deployable radio network-implementation and experience

RDRN: a rapidly deployable radio network-implementation and ...

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International Conference on Universal Personal Communications

作者： R.J. Sanchez J.B. Evans G.J. Minden V.S. Frost K.S. Shanmugan Dept. of Electr. Eng. & Comput. Sci. Kansas Univ. Lawrence KS USA Information and Telecommunications Technology Center Department of Electrical Engineering & Computer Science University of Kansas Lawrence KS USA

A proof-of-concept implementation for an experimental wireless ATM network developed within the project RDRN (rapidly deployable radio network) is presented. The RDRN architecture consists of two types of transportable nodes, remote nodes (RNs) and edge nodes (ENs), which utilize GPS-derived location information to rapidly configure themselves into a high-capacity adaptive wireless network operating at 1-10 Mb/s over distances as far as 10 kilometers. The initial prototype has been deployed and early experiments have been conducted to validate hardware, software, and protocol design and implementation. In addition to describing the RDRN architecture and protocols, this paper presents preliminary performance results obtained from the actual implementation.

关键词： Radio network Asynchronous transfer mode computer architecture Wireless networks Wireless application protocol Packet radio networks Radio control Control systems Array signal processing Contracts

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Synthesis of testable RTL designs

Synthesis of testable RTL designs

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International Conference on VLSI Design

作者： C.P. Ravikumar S. Gupta A. Jajoo Dept. of Electr. Eng. Indian Inst. of Technol. New Delhi India Information and Computer Sciences University of California Irvine USA Department of Electrical Engineering Indian Institute of Technology New Delhi India Cadence Design Systems Private Limited Noida Uttar Pradesh India

With several commercial tools becoming available, the high-level synthesis of application-specific integrated circuits is finding wide spread acceptance in VLSI industry today. Existing tools for synthesis focus on optimizing cost while meeting performance constraints or vice versa. Yet, verification and testing have emerged as major concerns of IC vendors since the repercussions of chips being recalled are far-reaching. In this paper, we concentrate on the synthesis of testable RTL designs using techniques from Artificial Intelligence. We present an adaptive version of the well known Simulated Annealing algorithm and describe its application to a combinatorial optimization problem arising in the high-level synthesis of digital systems. The conventional annealing algorithm was conceived with a single perturb operator which applies a small modification to the existing solution to derive a new solution. The Metropolis criterion is then used to accept or reject the new solution. In some of the complex optimization problems arising in VLSI design, a set of perturb functions become necessary, leading to the question of how to select a particular function for modifying the current system configuration. The adaptive algorithm described here uses the concept of reward and penalty from the theory of learning automata to "learn" to apply the appropriate perturb function. We have applied both the conventional simulated annealing algorithm and the adaptive simulated annealing algorithm to the problem of testability-oriented datapath synthesis for signal processing applications. Our experimental results indicate that the adaptive algorithm can yield better solutions in shorter time.

关键词： Signal processing algorithms Simulated annealing Integrated circuit synthesis Circuit testing High level synthesis Very large scale integration Adaptive algorithm Application specific integrated circuits Constraint optimization Cost function

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Royal Academy of Medicine in Ireland - Section of Bioengineering - Proceedings of meeting held in Dundalk, Co. Louth, in February 1998.

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IRISH JOURNAL OF MEDICAL SCIENCE 1998年第4期167卷 256-276页

作者： [Anonymous] Orthopaedic Research Unit The Queen’s University of Belfast School of Biomedical Sciences The Queen’s University of Belfast Howmedica International Ltd. Raheen Industrial Estate Limerick Department of Mechanical Engineering Trinity College Dublin 2 Mater Hospital Dublin 7 Orthopaedic Research Laboratory Århus University Hospital Denmark University of Limerick Limerick Limerick Regional Hospital Raheen Limerick Boston Scientific Ireland Ltd. Galway Department of Mechanical Engineering University College Dublin Dublin Department of Electrical and Electronic Engineering University College Dublin Dublin Bioengineering Research Centre Department of Mechanical Engineering University College Dublin Dublin Northern Ireland Bio-Engineering Centre (NIBEC) School of Electrical and Mechanical Engineering University of Ulster Newtownabbey Department of Mechanical & Manufacturing Engineering The Ashby Building The Queen’s University of Belfast Johnson and Johnson Professional Orthopaedic Division Queensway England Department of Cardiology and Department of Medical Physics & Bioengineering St. James’s Hospital Dublin 8 Burke House Ellison Street Castlebar Royal College of Surgeons in Ireland Department of Surgery Beaumont Hospital Dublin Department of Electronic and Electrical Engineering Trinity College Dublin 2 Department of Aeronautical Engineering The Queen’s University of Belfast Vascular Unit Belfast City Hospital Department of Medical Physics and Bioengineering St. James’s Hospital Dublin 8 Centre for Biomedical Electronics Department of Electronic and Computer Engineering University of Limerick Limerick Department of Mechanical and Aeronautical Engineering University of Limerick Limerick School of Health Sciences University of Ulster Ireland School of Physiotherapy University of Ulster Newtownabbey Clinical Engineering NI Medical Physics Agency Belfast and Radiology Royal Victoria Hospital Musgrave Park Hospital University of Limerick Biomedical Institute (ULBMI) Uni

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