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Antennas and Propagation Society International Symposium

作者： N. Inagaki H. Ohkura N. Kikuma Dept. of Electr. & Comput. Eng. Nagoya Inst. of Technol. Showa Japan Department of Electrical and Computer Engineering Nagoya Institute of Technology Showa Japan

In the LN-PC hybrid technique, numerical analysis method for microstrip patch antennas of arbitrary shape, the regions under and outside of the patch are solved separately by means of the theory for planar circuits (PC) and the theory for linear antennas (LN), respectively, and the two solutions are matched at the boundary. Although it leads to reasonably good results, more elaborate studies are desired concerning the patch edge and the coaxial cable to a planar circuit junction. The latter problem is dealt with, and the F-matrix representation of the junction is presented together with a few numerical examples. The input impedance is calculated by means of the present theory for a circular microstrip antenna.< >

关键词： Coaxial components Feeds Microstrip antennas Patch antennas Circuits Coaxial cables Voltage Numerical analysis Shape Antenna theory

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Formant extraction from Fourier transform phase

Formant extraction from Fourier transform phase

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： H.A. Murthy K.V.M. Murthy B. Yegnarayana Department of Computer Science and Engineering Indian Institute of Technology Chennai India Dept. of Comput. Sci. & Eng. Indian Inst. of Technol. Madras India

A method of extracting formant information from the short-time Fourier transform phase spectrum of speech is proposed. Fourier transform phase has not been used for formant extraction because it appears to be noisy and difficult to interpret. The effects of wrapping of phase (due to zeros close to the unit circle and the linear phase component) make it difficult to derive useful information. The authors develop algorithms to reduce the effects of wrapping.< >

关键词： Fourier transforms Data mining Speech Wrapping Resonance Resonant frequency Phase noise Shape Predictive models Delay

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A task allocation scheme for hypercube distributed computing systems using the affinity graph model

A task allocation scheme for hypercube distributed computing...

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IEEE Region 10 International Conference TENCON

作者： R. Satyanarayanan C.R. Muthukrishnan Dept. of Comput. Sci. & Eng. Indian Inst. of Technol. Madras India Department of Computer Science and Engineering Indian Institute of Technology Chennai India

In the affinity graph model, the vertices represent the modules in the task to be allocated. The weight of the edges represents the affinity the modules represented by the vertices have for each other. The affinity function has been defined in such a way that both the competing demands of load balancing and minimizing interprocessor communication are addressed. By applying a graph partitioning algorithm on such an affinity graph, optimal task allocation is possible. The task allocation algorithm presented for hypercube distributed computing systems uses the above idea to repeatedly partition the affinity graph until all modules in the task are allocated. The algorithm is fully distributed with no central control being exercised.< >

关键词： Hypercubes Distributed computing Load management Partitioning algorithms Cost function computer science Centralized control Communication system control Degradation Throughput

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Real-time adaptive filters for time-delay estimation

Real-time adaptive filters for time-delay estimation

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： P.M. Clarkson M.V. Dokic Department of Electrical and Computer Engineering Illinois Institute of Technology Chicago IL USA Dept. of Electr. & Comput. Eng. Illinois Inst. of Technol. Chicago IL USA

The development of real-time solutions for time-delay estimation problems is addressed. Two algorithms using adaptive digital filters are considered. The first uses the well-known LMs (least mean squares) algorithm, and the second is a novel algorithm using gradient adaptive lattice structures as prewhitening filters, followed by an LMS time-delay estimator. The filters are implemented on a TMS320-C25 system, and detailed performance comparisons are given.< >

关键词： Adaptive filters Delay estimation Least squares approximation Lattices Finite impulse response filter Digital filters Delay effects instruments Signal processing Noise reduction

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A new interpretation of the LQG/LTR technique using optimal projection equations

A new interpretation of the LQG/LTR technique using optimal ...

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IEEE Conference on Decision and Control

作者： R.N. Paschall P.S. Maybeck Dept. of Electr. & Comput. Eng. Air Force Inst. of Technol. Wright-Patterson AFB OH USA Department of Electrical and Computer Engineering Air Force Institute of Technology OH USA

It is demonstrated that the LQR/LTR (linear quadratic Gaussian/loop transfer recovery) technique can be viewed as a way to achieve robustness even under the constraint of a reduced-order controller, even though one is not necessarily recovering a desired transfer function asymptotically. The optimal projection equation (OPE) approach gives an expanded view of LQG/LTR technique when the order of the controller is intentionally less than the order of the system design model. Also, the OPE approach allows other forms for Omega , which may give more flexibility as to how the system perturbations are modeled, to be chosen.< >

关键词： Hilbert space Riccati equations Robust control Control systems Optimal control Cost function Gaussian noise Q measurement Noise measurement Filtering theory

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Diode and thyristor turn-off snubbers simulation by KREAN and an easy to use design algorithm

Diode and thyristor turn-off snubbers simulation by KREAN an...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： T.M. Undeland A. Petterteig G. Hauknes A.K. Adnanes S. Garberg Department of Electrical and Computer Engineering Norwegian Institute of Technology Trondheim Norway Dept. of Electr. & Comput. Eng. Norwegian Inst. of Technol. Trondheim Norway

RC snubbers must be used for limiting the overvoltages at the diode or thyristor reverse recovery transients. This is true for the application range from line frequency conversion to the output rectifiers in switched-mode DC power supplies. An insight into the mechanism of the turn-off waveforms is obtained by simulations and calculations, and the tradeoffs between overvoltages and losses are presented. An easy-to-use nomogram for the selection of the snubber components is given. A computer program dedicated for power electronic circuit analysis under development, KREAN, is used for the simulations, and is briefly described.< >

关键词： Diodes Thyristors Snubbers Surges Computational modeling Circuit simulation Circuit analysis computing Frequency conversion Rectifiers Switched-mode power supply

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A bandwidth efficient signaling for MFSK systems

A bandwidth efficient signaling for MFSK systems

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IEEE Conference on Vehicular technology (VTC)

作者： G.E. Atkin H.P. Corrales Dept. of Electr. & Comput. Eng. Illinois Inst. of Technol. Chicago IL USA Department of Electrical and Computer Engineering Illinois Institute of Technology Chicago IL USA

The use of a multiple-tone modulation scheme for a M-ary frequency shift keying (MFSK) system proves to be an efficient alternative for bandwidth constraint channels. A combinatorial design, called balanced incomplete block design, used to select the signaling format based on blocks of frequencies rather than single tones, as in a conventional MFSK system, is shown to reduce drastically the system bandwidth requirement and also to improve the performance of the system of a Rayleigh fading type of channel by adding an implicit diversity to the system. A nonbinary block code concatenated to the multi-tone MFSK system is considered, and it is shown to increase the diversity of the system, and consequently to improve its performance.< >

关键词： Bandwidth Frequency shift keying Signal design Frequency diversity Rayleigh channels Block codes Concatenated codes Degradation AWGN channels

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REDUCTION METHOD OF TRACKING ERRORS DUE TO MULTIPATH WAVES IN DIRECT SEQUENCE SPREAD SPECTRUM SYSTEMS.

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Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi) 1987年第9期70卷 118-126页

作者： Maruyama, Satoshi Iwanami, Yasunori Ikeda, Tetsuo Faculty of Engineering Nagoya Institute of Technology Nagoya Japan 486 Satoshi Maruyama graduated 1983 Dept. Electrical Eng. Fac. Eng. Nagoya Inst. Technology. Completed Master's program 1985 Grad. School and affiliated with Fujitsu Co. Engaged in researches in distance measurement by spread spectrum technique. Tetsuo Ikeda graduated 1961 Dept. Comm. Eng. Fac. Eng. Tohoku University. Completed doctoral program 1966 Grad. School. Assistant 1966 and Assoc. Prof. 1968 Fac. Eng. Tohoku University. Assoc. Prof. 1973 and Prof. 1977 Nagoya Inst. Technology. Engaged in researches in network theory computer networks communication system and electromagnetic environment. Doctor of Eng. Member I.E.E.E. Japan TV Soc. Jap. Inf. Proc. Soc. Jap. Soc. Inf. Comm. and I.E.E.E.

The spread spectrum (SS) communication is a communication system which has excellent characteristics against noise and is suited to the code-division multiplex. This paper describes a method which reduces the tracking phase error in DLL due to multipath waves in SS communication system. The method is based on the model with a single multipath wave.

关键词： RADIO TRANSMISSION

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The polylogarithm in the field of two irreducible quintics

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Aequationes Mathematicae 1986年第1期31卷 315-321页

作者： Abouzahra, M. Lewin, L. Lincoln Laboratory Massachusetts Inst. of Technology Lexington 02173 MA United States Dept. of Electrical and Computer Engineering University of Colorado Boulder 80309 CO United States

A brief review of the polylogarithmic ladder and its cyclotomic equation is followed by an application to the roots of two irreducible quintic equations. The first is unique in its class and possesses four accessible and two inaccessible valid ladders. The other equation gives rise to a single ladder determinable, at the present time, only by numerical computation, and is a member of a completely new category. © 1986 Birkhäuser Verlag.

关键词： AMS (1980) subject classification: Primary 33A70, 30D05

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Abstracts

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Environmental Management 1977年第1期1卷 67-96页

作者： Frankenfeld, John W. Schulz, Wolfgang McMurty, George J. Petersen, Gary W. May, G. A. Hering, F. S. Schwartz, J. I. Heywood, J. B. Chigier, N. A. Grohse, E. W. Walker, J. D. Colwell, R. R. Petrakis, L. Pergament, H. S. Thorpe, R. D. Schoepf, Richard W. Krzyczkowski, Roman Henneman, Suzanne S. Hudson, Charles L. Putnam, Evelyn S. Thiesen, Donna J. Parks, G. A. McCarty, Perry L. Leckie, J. O. Schrumpf, Barry J. Simonson, G. H. Paine, D. P. Lawrence, R. D. Pyott, W. T. Leh, M. Elders, W. Combs, J. Caplen, T. Harrison, F. L. Wong, K. M. Heft., R. E. Charnell, Robert L. Lehmann, Edward J. Mallon, Lawrence G. Hatfield, Cecile Adams, Gerald H. Johanning, James Talvitie, Antti Noll, Kenneth E. Miller, Terry Smiarowski, Joseph F. Willis, Cleve E. Foster, John H. Schlesinger, Benjamin Daetz, Douglas Lear, Donald U. Smith, Mona F. Hundemann, Audrey S. Crockett, Pernell W. Werner, Kirk G. Carroll, Thomas E. Maase, David L. Genco, Joseph E. Ifeadi, Christopher N. Lowman, F. G. Christensen, S. W. Van Winkle, W. Mattice, J. S. Harrison, Elizabeth A. Barker, James C. Chesness, Jerry L. Smith, Ralph E. Shaheeen, Donald G. Raney, R. Keith Borton, T. Wezernak, C. T. Raney, R. K. Sherwani, Jabbor K. Moreau, David H. Eisenberg, Norman A. Lynch, Cornelius J. Breeding, Roger J. Johnson, J. D. Foster, K. E. Mouat, D. A. Clark, R. Hyden, John William Owen, Wilfred Bayfield, Neil G. Barrow, Graham C. Stolz, Stephanie B. Wienckowski, Louis A. Brown, Betram S. Keyfitz, Nathan Wilson, W. L. Newman, Peter W. G. Bammi, Deepak Bammi, Dalip Goddard, James E. Chisholm, Tony Walsh, Cliff Brennan, Geoffrey Thompson, K. S. Richardson, R. Jensen, Clayton E. Brown, Dail W. Mirabito, John A. Cowing, Thomas G. Binghamton, Suny Siehl, George H. Albrecht, O. W. Alexander, Ariel Barde, Jean -Philippe Darby, William P. McMichael, Francis Clay Dunlap, Robert W. Muckleston, Keith W. Frankenhoff, Charles A. Giulini, Lorenzo T. Wyatt, T. Black, Peter E. Keating, William Thomas Leonard, M. E. Fisher, E. L. Brunelle, M. F. Dickinson, J. E. Pethig, Rudiger Clapham Exxon Research & Engineering Co. Linden Government Research Lab Coast Guard Washington D.C. Department of Transportation Washington D.C. Office For Remote Sensing of Earth Resources. NASA Earth Resources Survey Program Pennsylvania State University Washington D.C. Department of the Navy Washington D.C. Cambridge. Dept. of Mechanical Engineering Massachusetts Inst. of Technology USA Huntsville. School of Graduate Studies and Research Alabama Univ. USA Dept. of Microbiology. Office of Naval Research Maryland Univ. Arlington Research and Development Co. Pittsburgh AeroChem Research Labs. Inc. Princeton Dept. of the Interior Office of Library Services. Bibliographic Series (Final) Washington D.C. Interplan Corp. Santa Barbara Urban Mass Transportation Adm. Washington D.C. Naval Underwater Systems Center Newport Calif. Mercury Project. National Science Found Stanford Univ Washington D.C. Div. of Advanced Environmental Research & Tech. USA Corvallis. NASA Earth Resources Survey Program Oregon State Univ. Washington D.C. Riverside. Inst. of Geophysics and Planetary Physics National Science Foundation California Univ. Washington D.C. Livermore Lawrence Livermore Lab. California Univ. USA Atlantic Oceanographic and Meteorological Labs. National Oceanic and Atmospheric Administration Miami National Technical Information Service Springfield Miami Univ. Coral Gables School of Law National Oceanic and Atmospheric Administration Rockville National Academy of Sciences Office of Sea Grant Washington D. C. School of Law National Oceanic and Atmospheric Administration Office of Sea Grant. Rockville Norman. Dept. of Civil Engineering and Environmental Science. Urban Mass Transportation Administration Oklahoma Univ. Washington D. C. Knoxville.Dept. of Civil Engineering. Federal Highway Administration Tennessee Univ. Washington D. C. Amherst.Water Resources Research Center. Office of Water Research and Technology Massachusetts Univ. Washington D. C. Calif. Dept. of Industria

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