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A Semi-Analytical Method for the Calculation of Electromagnetic Power Density Originating from Radar and Microwave Link Stations. Practical Dosimetric Applications

A Semi-Analytical Method for the Calculation of Electromagne...

引用

Sixteenth International Wrocław Symposium and Exhibition, Electromagnetic Compatibility 2002

作者： Nikolaos Uzunoglu Georgios Stamatakos Christos Christodoulopoulos Christos Tsilias Dept. of Electrical and Computer Engineering Division of Information Transmission Systems and Materials Technology National Technical University of Athens Zografou Campus GR-157 80 Zografos Greece Intracom s.a. Markopoulou Avenue Peania GR-190 02

ISBN: (纸本)8391614603

A semi-analytical method for the calculation of the electromagnetic power density originating from rectangular and elliptical aperture antennas is presented. Such antennas can simulate radar and microwave link radiating elements. The analysis makes use of the Fourier transfom in the spectral domain and is based on the approximate assumption that both the electric and the magnetic fields have constant polarization and peak values over the entire aperture surface. Both fields outside the aperture on the aperture plane are assumed zero. Harmonic temporal dependence is considered. In the source free region, the field of a monochromatic wave radiated by the aperture is expressed as a superposition of plane waves (all of the same frequency, different amplitudes and traveling in different directions). Application of boundary conditions leads to suitable expressions for the Fourier coefficients. Numerical calculation (e.g. by Gauss integration) of an infinite double integral provides the electric field value at any given point of interest. Consequently, the power density is obtained in a rather straightforward way. As in radar / microwave link stations linear dipoles and systems of folded dipoles are usually present, calculation of the power density originating from specific linear antenna configurations of practical interest can also performed according to the corresponding classical expressions [1]. Obviously, using the above mentioned analyses and performing appropriate geometric calculations, an upper boundary of the power density steming from all antennas of the station can be calculated at any point of interest (e.g. on the fence of the premises). A novel algorithm for the selection of safety critical points around a radar / microwave link station of which all antennas produce maximum radiation on a horizontal plane (e.g. surveillance radar antennas) is proposed so that the definition of a “safe area” becomes feasible. Sample calculations and corresponding measurement

关键词： Radar Density measurement Power system measurements Radar antennas Electric fields Safety Microwave theory and techniques Microwave antennas Mathematical models Aperture antennas

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Reliability projection and polarity dependence of TDDB for ultra thin CVD HfO/sub 2/ gate dielectrics

Reliability projection and polarity dependence of TDDB for u...

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Symposium on VLSI technology

作者： S.J. Lee S.J. Rhee R. Clark D.L. Kwong Microelectronics Research Center Department of Electrical and Computer Engineering University of Technology Austin TX USA University of Texas at Austin Austin TX US Dept. of Electr. & Comput. Eng. Texas Univ. Austin TX USA

ISBN: (纸本)078037312X

A systematic study of long-term reliability of ultra thin CVD HfO/sub 2/ gate stack (EOT=10.5 /spl Aring/) with TaN gate electrode is presented. The polarity and area dependence and temperature acceleration of time-to-breakdown (TBO), defect generation rate, and critical defect density are studied. It is found that T/sub BD/ is polarity-independent (T/sub BD,-Vg/=T/sub BD,+Vg/). TDDB lifetime acceleration shows that 10-year lifetime of HfO/sub 2/ gate stack is projected at Vg=1.63 V for EOT=8.6 /spl Aring/ and Vg=1.88 V for EOT=10.6 /spl Aring/ at 25/spl deg/C. However, after temperature acceleration of 150/spl deg/C, area scaling to 0.1 cm/sup 2/, and the projection to low percentage failure rate of 0.01%, the maximum operating voltages are projected to be Vg=0.6 V for EOT 8.6 /spl Aring/ and Vg=0.75 V for EOT=10.6 /spl Aring/.

关键词： Hafnium oxide Dielectrics Leakage current Acceleration Stress Voltage MOS devices Electrodes Electric breakdown Temperature dependence

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Semantic resolution for E-Commerce

Semantic resolution for E-Commerce

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Proceedings of the Biannual World Automation Congress

作者： Yun Pang Youyong Zou Xiaocheng Luan N. Ivezic M. Gruninger A. Jones Dept. of Comput. Sci. & Electr. Eng. Univ. of Maryland Baltimore County MD USA Department of Computer Science and Electrical Engineering University of Maryland Baltimore County Baltimore MD USA Manufacturing Systems Integration Division National Institute of Standards and Technology Gaithersburg MD USA

We describe a research project on resolving semantic differences for multi-agent systems (MAS) in electronic commerce. The approach can be characterized as follows: (1) agents in a MAS may have their own specific ontologies defined on top of a shared base ontology; (2) concepts in these ontologies are represented as frame-like structures based on DAML+OIL language; (3) the semantic differences between agents are resolved at runtime through inter-agent communication; and (4) the resolution is viewed as an abductive inference process, and thus necessarily involves approximate reasoning.

关键词： Ontologies Vocabulary Multiagent systems Microstrip computer aided manufacturing Runtime Artificial intelligence Consumer electronics Software agents Application software

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Materials analysis of degraded vertical cavity surface emitting lasers

Materials analysis of degraded vertical cavity surface emitt...

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Conference on Lasers and Electro-Optics (CLEO)

作者： D.T. Mathes R. Hull K.D. Choquette K.M. Geib A.A. Allerman Department of Materials Science and Engineering University of Virginia Charlottesville VA University of Virginia Charlottesville VA US Dept. of Mater. Sci. & Eng. Virginia Univ. Charlottesville VA USA Electrical and Computer Engineering Department University of Illinois at Urbana-Champaign Urbana IL Center for Compound Semiconductor Science and Technology Sandia National Labs Albuquerque NM

Summary from only given. Using TEM and novel focused ion beam (FIB) sectioning techniques we have investigated the mechanisms that are responsible for VCSEL degradation and failure. The main cause of failure is the generation of complex dislocation dipole and loop arrays likely by non-radiative recombination enhanced mechanisms. Dislocations punched out due to oxide-induced strain or dislocations with origins in the substrate or surface appear to act as nucleation sites for these complex arrays.

关键词： Vertical cavity surface emitting lasers Optical materials Degradation Surface emitting lasers Mirrors Optical surface waves Optical fiber communication Temperature Dielectrics Reflectivity

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A low power digital beamformer for handheld ultrasound systems

A low power digital beamformer for handheld ultrasound syste...

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27th European Solid-State Circuits Conference, ESSCIRC 2001

作者： Gierenz, V.S. Schwann, R. Noll, T.G. Dept. of Electrical Engineering and Computer Systems University of Technology RWTH Aachen Germany

The digital part of a low power single chip digital beamformer for use in low-cost handheld ultrasound imaging systems is presented. To ensure lowest power dissipation for battery operated systems, a quantitative optimization strategy from system down to physical layout level was employed. A cascadable test chip comprising a single processing channel was realized in a 0.5 μm CMOS technology. Operating at 40 MHz the digital part dissipates 25mW from a dual 1.8 V/3.3 V power supply. © 2001 IEEE.

关键词： Beamforming

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A flexible datapath generator for physical oriented design

A flexible datapath generator for physical oriented design

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27th European Solid-State Circuits Conference, ESSCIRC 2001

作者： Weiss, O. Gansen, M. Noll, T.G. Dept. of Electrical Engineering and Computer Systems University of Technology RWTH Aachen Germany

A flexible datapath generator for the physical oriented design of optimized building blocks in the area of DSP ASIC design is presented. The generator concept combines the advantages of full-custom macros regarding power dissipation, silicon area, and throughput rate with a low design effort and high flexibility. Hence, the datapath generator enables the physical oriented design of parameterizable IP blocks. Industry related benchmarks demonstrate the performance of the datapath generator. © 2001 IEEE.

关键词： Integrated circuit design

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Intersymbol/cochannel interference cancellation for transmit diversity systems in frequency selective fading channels

Intersymbol/cochannel interference cancellation for transmit...

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IEEE 54th Vehicular technology Conference (VTC FALL 2001)

作者： Li, L. Yao, Y.-D. Li, H. Wireless Systems Engineering Lab Electrical and Computer Engr. Dept. Stevens Institute of Technology Hoboken NJ 07030 United States

As a coding technique designed for use with multiple transmit antennas, space-time coding (STC) has been gaining more and more attention recently due to its attractive characteristics to provide diversity at the receiver and coding gain over an uncoded system without sacrificing the bandwidth, and increase the effective transmission rate as well as the potential system capacity. This paper presents powerful and computationally linear intersymbol and cochannel interference suppression schemes, considering both zero-forcing (ZF) and minimum mean-square error (MMSE) criteria to combat intersymbol interference (ISI) and suppress cochannel interference (CCI) and obtain diversity gain in a system with transmit diversity technique using symbol-level space-time block coding (STBC). General linear schemes are derived for the transmit diversity case with two transmit antennas and M receive antennas. The conditions are investigated under which interference can be suppressed perfectly using linear FIR filters in noise-free environments. Binary phase shift keying (BPSK) modulation scheme is assumed to simulate the proposed diversity and interference suppression methods. Numerical results show significant performance improvements compared to the cases without interference suppression.

关键词： Intersymbol interference

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Linear and decision feedback equalizations for space-time block coded systems in frequency selective fading channels

Linear and decision feedback equalizations for space-time bl...

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12th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2001)

作者： Li, L. Li, H. Yao, Y.-D. Wireless Systems Engineering Lab Electrical and Computer Engr. Dept. Stevens Institute of Technology Hoboken NJ 07030 United States

As a coding technique designed for use with multiple transmit antennas, space-time coding (STC) has been gaining more and more attention recently due to its attractive characteristics to provide diversity at the receiver and coding gain over an uncoded system without sacrificing the bandwidth, and increase the effective transmission rate as well as the potential system capacity. This paper presents powerful and computationally linear and decision feedback equalization schemes, considering both zero-forcing (ZF) and minimum mean-square error (MMSE) criteria to combat intersymbol interference (ISI) and obtain diversity gain in a system with transmit diversity technique using symbol-level space-time block coding. General linear and decision feedback equalizers are derived for the transmit diversity case with two transmit antennas and M receive antennas. The conditions are investigated under which FIR channels can be equalized perfectly using linear FIR filters in noise-free environments. BPSK modulation scheme is assumed to simulate the proposed diversity and equalization methods. Numerical results show significant performance improvements compared to the cases without equalization.

关键词： Signal encoding

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Hybrid geodesics as optimal solutions to the collision-free motion planning problem 4

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4th International Workshop on Hybrid systems: Computation and Control, HSCC 2001

作者： Hu, Jianghai Prandini, Maria Johansson, Karl Henrik Sastry, Shankar Dept. of Electrical Engineering and Computer Sciences University of California at Berkeley BerkeleyCA94720 United States Dept. of Electrical Engineering for Automation University of Brescia Brescia Italy Dept. of Signals Systems and Sensors Royal Institute of Technology Stockholm Sweden

ISBN: (纸本)3540418660

In this paper we address the problem of designing energy minimizing collision-free maneuvers for multiple agents moving on a plane. We show that the problem is equivalent to that of finding the shortest geodesic in a certain manifold with nonsmooth boundary. This allows us to prove that the optimal maneuvers are C1 by introducing the concept of u-convex manifolds. Moreover, due to the nature of the optimal maneuvers, the problem can be formulated as an optimal control problem for a certain hybrid system whose discrete states consist of diffierent "contact graphs". We determine the analytic expression for the optimal maneuvers in the two agents case. For the three agents case, we derive the dynamics of the optimal maneuvers within each discrete state. This together with the fact that an optimal maneuver is a C1 con- catenation of segments associated with diffierent discrete states gives a characterization of the optimal solutions in the three agents case. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Hybrid systems

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Analyzing heterogeneous system architectures by means of cost functions: A comparative study for basic operations

Analyzing heterogeneous system architectures by means of cos...

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27th European Solid-State Circuits Conference, ESSCIRC 2001

作者： Blume, H. Feldkamper, H.T. Hubert, H. Noll, T.G. Dept. of Electrical Engineering and Computer Systems Institute of Technology RWTH Aachen Schinkelstr. 2 52062 Aachen Germany

Optimum partitioning plays a crucial role in the implementation of systems on heterogeneous target architectures. Typical target architectures for such systems include FPGAs, semi-custom or physically optimized ASICs as well as programmable digital signal or general purpose processors. The goal was to provide an estimation for implementation specific parameters like throughput rate, power dissipation and required silicon area by means of cost functions. Considering normalization we provide implementation parameters of selected basic operations like linear and nonlinear filtering, exemplary arithmetic operation and simple matching operations which all are required in the digital video processing domain. These operations were optimized for each architecture block. We show quantitatively that the cost ratio between different architecture blocks highly depends on the operation to be performed. This information is essential in order to find the optimum partitioning for implementing a system. © 2001 IEEE.

关键词： Cost functions

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