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IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis

作者： Z. Tira P. Duvaut P. Brunel B. Georgel EDF/DER/TAI Chatou France ETIS ENSEA France

We present a new type of multiresolution, called oblique multiresolution (OMR), necessary in the decision context. All the fundamental properties of OMR are given and justified. The aim is to develop a multiresolution analysis which provide a redundant decomposition for use in the detection and classification application. The signal decomposition is computed with pyramidal algorithms. We give a necessary-sufficient conditions to reconstruct the signal from its oblique multiresolution decomposition and show how to compute reconstructing filters.< >

关键词： Multiresolution analysis Signal resolution Image reconstruction Ordinary magnetoresistance Image coding density estimation robust algorithm Pattern recognition Signal detection Sufficient conditions Filters

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GEOMETRIC FACTOR FOR HALL-MOBILITY CHARACTERIZATION USING THE VANDERPAUW DUAL CONFIGURATION

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IEEE TRANSACTIONS ON ELECTRON DEVICES 1993年第8期40卷 1508-1511页

作者： NATHAN, A ALLEGRETTO, W LSI LOG CORP SANTA CLARACA UNIV ALBERTA DEPT MATHEDMONTON T6G 2G7ALBERTACANADA

We present a geometric factor applicable to a wide range of device geometries of the van der Pauw dual configuration. Such a configuration allows a direct retrieval of the Hall mobility in a single measurement of the magnetic-field-induced imbalance in output current. In view of scaling considerations, the geometric factor is characterized simply in terms of device aspect ratio (L/W) and relative electrode separation (d/W). The factor, which is based on numerical computations, overcomes the limitations inherent in the existing form that has been analytically obtained for an infinitesimally small electrode separation. Hence, it is now possible to design practical device geometries which readily lend themselves to in situ measurement and characterization of the material or process in question, without being constrained by photolithography limitations.

关键词： Hall effect density estimation robust algorithm Magnetic field measurement Electrodes Geometry Current measurement Lorentz covariance Magnetic separation Magnetic materials Semiconductor materials

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Partial evaluation as an aid to the comprehension of Fortran programs

Partial evaluation as an aid to the comprehension of Fortran...

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IEEE Workshop on Program Comprehension

作者： S. Blazy P. Facon EDF DER Clamart France CEDRIC IIE Evry France

The authors describe a technique and a tool supporting partial evaluation of Fortran programs, i.e. their specialization for specific values of their input variables. They aim at understanding old programs, which have become very complex due to numerous extensions. From a given Fortran program and these values of its input variables, the tool provides a simplified program, which behaves like the initial one for the specific values. This tool uses mainly constant propagation and simplification of alternatives to one of their branches. The tool is specified in inference rules and operates by induction on the Fortran abstract syntax. These rules are compiled into Prolog by the Centaur/Fortran environment.< >

关键词： Input variables density estimation robust algorithm Data analysis Program processors

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A VEP-based computer interface for C2-ouadriplegics

A VEP-based computer interface for C2-ouadriplegics

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

作者： P.J. Cilliers A.J.W. Van Der Kouwe Department of Electrical and Electronic Engineering University of Pretoria Pretoria South Africa

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Using a relational database for software maintenance: A case study

Using a relational database for software maintenance: A case...

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International Conference on Software Maintenance (ICSM)

作者： V. Narat EDF DER Clamart France

An approach to storing source code using a relational database is described. The goal of this approach is to assist in the maintenance of source code, especially in producing cross references documentation. Why this approach was chosen and how the system's architecture was set up are explained. The emphasis, however, is placed upon the results obtained by using this system, in terms of volume and response time.< >

关键词： Relational databases Software maintenance Computer aided software engineering Documentation Application software Time factors density estimation robust algorithm Computer applications Data processing Power generation

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Application of a simple analytical model to estimate effectiveness of radiation shielding for neutrons

Application of a simple analytical model to estimate effecti...

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IEEE Conference on Particle Accelerator

作者： S. Frankle D. Fitzgerald R. Hutson R. Macek C. Wilkinson Medium Enetgy Physics Division Los Alamos National Laboratory Los Alamos NM USA

Neutron dose equivalent rates have been measured for 800-MeV proton beam spills at the Los Alamos Meson Physics Facility. Neutron detectors were used to measure the neutron dose levels at a number of locations for each beam-spill test, and neutron energy spectra were measured for several beam-spill tests. Estimates of expected levels for various detector locations were made using a simple analytical model developed for 800-MeV proton beam spills. A comparison of measurements and model estimates indicates that the model is reasonably accurate in estimating the neutron dose equivalent rate for simple shielding geometries. The model fails for more complicated shielding geometries, where indirect contributions to the dose equivalent rate can dominate.< >

关键词： Analytical models Neutrons density estimation robust algorithm Testing Area measurement Performance evaluation Detectors Particle beams Concrete Energy measurement

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Simulation of Complex High Order Systems using Reduced Order Models

Simulation of Complex High Order Systems using Reduced Order...

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American Control Conference (ACC)

作者： Jayanta Pal B. Sarvesh M. K. Ghosh Department of Electrical Engineering Indian Institute of Technology Kharagpur India

A computer oriented algorithmic method is proposed to overcome the serious disadvantage of the classical Pade approximation technique often resulting in unstable reduced models from stable high order systems. For a desired kth order reduced model, the 2kth time moment is adjusted for stability while the initial (2k-1) time moments of the original system are retained in the reduced model. Some typical numerical examples show that this method gives a stable model with better time and frequency response matching properties.

关键词： Reduced order systems Polynomials density estimation robust algorithm Time factors Frequency response Power system modeling Frequency domain analysis Steady-state Stability criteria Equations

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Operator's knowledge, skill and know-how during the use of emergency procedures: design, training and cultural aspects

Operator's knowledge, skill and know-how during the use of e...

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IEEE Conference on Human Factors and Power Plants

作者： Y. Dien M. Llory R. Montmayeul EDF-DER-ESF Clamart France

During accidents, safety depends on the intelligent implementation of operating procedures. The implications of this statement on procedure design and operators' training are analyzed. The question is raised as to whether some cultural blocks limit the extent of possible improvements. The information presented marks a particular stage in the work of the Research and Development Division of a French company on the design and assessment of emergency and abnormal operating procedures. It is based on on-site psychosociological analyses of control activities and on ergonomic analyses of the behavior of operators under emergency and abnormal operating conditions on full-scale simulators.< >

关键词： Cultural differences Humans Chemical industry Industrial accidents density estimation robust algorithm Railway safety Nuclear power generation Reflection Research and development Psychology

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Dynamic number of segments of spectral temporal mapping of the signal-averaged electrocardiogram derived from duration of the QRS complex

Dynamic number of segments of spectral temporal mapping of t...

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Computers in Cardiology (CinC)

作者： P. Kulakowski M. Malik Y. Bashir S. Heald O. Odemuyiwa A.J. Camm Department of Cardiological Sciences Saint George's Hospital Medical School London UK

The signal-averaged electrocardiogram (ECG) was recorded and analyzed in 30 postinfarction patients with ventricular tachycardia and long late potentials, and in 30 controls with normal signal-averaged ECG to investigate whether the results of spectral temporal mapping of the signal-averaged ECG are disturbed in patients with long late potentials, and to calculate a formula for computing the number of ECF segments to be analyzed in such patients. When a new formula, based on the difference between the total filtered and the standard QRS durations, was used, the identification of patients with ventricular tachycardia and long late potentials was significantly improved.< >

关键词： Signal mapping density estimation robust algorithm Electrocardiography Signal analysis History Filters Noise level Time domain analysis Filtering Voltage

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Ergonomic evaluation in the design of future control rooms

Ergonomic evaluation in the design of future control rooms

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IEEE Conference on Human Factors and Power Plants

作者： Y. Dien C. Kasbi R. Montmayeul G. Beltranda EDF-DER-ESF Clamart France EDF-SEPTEN-SI Villeurbanne France

It is stated that ergonomic evaluation should be an integral part of nuclear power plant control room design. The merits and drawbacks of performing such an evaluation at certain moments in the design process and the various evaluation aids available are discussed. A general ergonomic evaluation method for the control room is proposed.< >

关键词： Ergonomics Process design Performance evaluation Control systems Power generation Power system reliability Centralized control Availability Testing density estimation robust algorithm

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