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DIGIT-SET CONVERSIONS - GENERALIZATIONS AND APPLICATIONS

IEEE TRANSACTIONS ON comput.RS 1994年第5期43卷 622-629页

作者： KORNERUP, P Dept. of Math. & Comput. Sci. Odense Univ. Abstract Authors References Cited By Keywords Metrics Similar Download Citation Email Print Request Permissions

The problem of digit set conversion for fixed radix is investigated for the case of converting into a non redundant, as well as into a redundant, digit set. Conversion may he from very general digit sets, and covers as special cases multiplier recodings, additions, and certain multiplications. We generalize known algorithms for conversions into non redundant digit sets, as well as apply conversion to generalize the O(log) time algorithm for conditional sum addition using parallel prefix comput.tion, and a comparison is made with standard carry-lookahead techniques. Examples on multi-operand addition are used to illustrate the generality of this approach. O(1) time algorithms for converting into redundant digit sets are generalized based on a very simple lemma, which provides a framework for all conversions into redundant digit sets. Applications in multiplier recoding and partial product accumulation are used here as exemplifications.

关键词： comput.R ARITHMETIC CONDITIONAL SUM ADDITION DIGIT SET CONVERSION MULTIPLIER RECODING NONREDUNDANT AND REDUNDANT REPRESENTATION ON-THE-FLY CONVERSION PARALLEL PREFIX comput.TION

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Rough surface scattering

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Waves in Random Media 1991年第3期1卷 S41-S56页

作者： Desanto, J.A. Wombell, R.J. Dept. of Math. and Comput. Sci. Colorado Sch. of Mines Golden CO United States

A summary of the theoretical and comput.tional approaches to rough surface scattering is presented. For the Dirichlet problem new comput.tional results are presented for the behaviour of the normal derivative of the field on the surface as well as the behaviour of coherent and incoherent intensities as a function of angle and surface height. Examples are given for surface reconstruction using scattered data as a function of surface height and as the scattered data window is narrowed.

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A SYSTOLIC, LINEAR-ARRAY MULTIPLIER FOR A CLASS OF RIGHT-SHIFT ALGORITHMS

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IEEE TRANSACTIONS ON comput.RS 1994年第8期43卷 892-898页

作者： KORNERUP, P Dept. of Math. & Comput. Sci. Odense Univ. Denmark Abstract Authors References Cited By Keywords Metrics Similar Download Citation Email Print Request Permissions

A very simple multiplier cell is developed for use in a linear, purely systolic array forming a digit-serial multiplier for unsigned or 2' complement operands. Each cell produces two digit-product terms and accumulates these into a previous sum of the same weight, developing the product least significant digit first. Grouping two terms per cell, the ratio of active elements to latches is low, and only [n/2] cells are needed for a full n by n multiply. A modulo-multiplier is then developed by incorporating a Montgomery type of modulo-reduction. Two such multipliers interconnect to form a purely systolic modulo exponentiator, capable of performing RSA encryption at very high clock frequencies, but with a low gate count and small area. It is also shown how the multiplier, with some simple back-end connections, can comput. modular inverses and perform modular division for a power of two as modulus.

关键词： SYSTOLIC ARRAY DIGIT-SERIAL MULTIPLIER 2' COMPLEMENT MULTIPLICATION MODULO-MULTIPLICATION AND EXPONENTIATION RSA MODULAR INVERSE MODULAR DIVISION EXACT DIVISION AND HENSEL CODES

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An anisotropic acoustic wave equation for VTI media

An anisotropic acoustic wave equation for VTI media

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Society of Petroleum Engineers, 68th European Association of Geosci.ntists and Engineers Conference and Exhibition, incorporating SPE EUROPEC 2006, EAGE 2006: Opportunities in Mature Areas

作者： Zhou, H. Zhang, G. Bloor, R. GX Technology Inst. of Comput. Math. and Sci./Eng. CAS China

Here we propose a new anisotropic acoustic wave equation based on the same dispersion relation as Alkhalifah's (2000), but introducing an auxiliary function which allows the original fourth-order differential equation to become a coupled system of lower-order differential equations. Of these two equations, one equation can be considered as a hyperbolic wave equation for elliptical anisotropy, but with a correction term that compensates for the loss of anisotropy for VTI media, while the other can be considered as the additional expansion or contraction of the wavefront in the lateral directions. This two-way anisotropic wave equation can be used for both modeling and reverse-time migration. The new anisotropic acoustic equation has the obvious physical meaning and is much easier to implement. Impulse responses for both modeling and migration have been shown to validate the proposed anisotropic acoustic equation. Copyright 2006, European Association of Geosci.ntists and Engineers.

关键词： Wave equations

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Performance simulation on a multitarget radial remote-positioning system 3

Performance simulation on a multitarget radial remote-positi...

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3rd International Workshop on Modeling, Analysis, and Simulation of comput.r and Telecommunication Systems, MASCOTS 1995

作者： Vidal, D. Dept. of Math. and Comput. Sci. University of Balearic Islands Palma07071 Spain

ISBN: (纸本)0818669020

Some performance simulation results of a remote-positioning system on a multitarget real-time context for oceanic instruments tracking are discussed and several indicators are considered to fine-tune the system's design requirements. Results show that, within the particular extent of practical applicability, an equilibrium between the performance indicators considered can be achieved. © 1995 IEEE.

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Relevance feedback in the retrieval of reusable software components 29

Relevance feedback in the retrieval of reusable software com...

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29th Hawaii International Conference on System sci.nces, HICSS 1996

作者： Toptsis, A.A. Jin, Lan Dept. of Comput. Sci. and Math. York Univ. Atkinson College TorontoON Canada

ISBN: (纸本)0818673249

We focus on the issue of retrieving software from a collection of reusable software components. The proposed method is a variation of the relevance feedback process, a popular retrieval mechanism typically used for text document environments. We describe how this method can be adapted for reusable software collections. Two variations of a relevance feedback process are presented. Also, experimental results of the methods' performance evaluation on two different software collections are presented and analyzed. The results show that both methods perform well, by attaining recall and precision values above 70% on the average. Specific drawbacks of the methods are also identified and discussed. Our proposal constitutes an attempt to put the software retrieval problem in the map of technical obstacles for software reuse. Unlike most related reports that treat software retrieval as a subissue of some other software reusability issue (such as classification), we believe that software retrieval is a self-standing issue. As such, we address the problem of software retrieval in a general framework, that is, without being attached to particular software classification and repository organization techniques. © 1996 IEEE.

关键词： comput.r software reusability

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LEVERRIER-LAGUERRE ALGORITHM FOR THE MATRIX POLYNOMIAL OF DEGREE TWO

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Numerical math.matics A Journal of Chinese Universities(English Series) 2002年第2期11卷 226-234页

作者：吴筑筑郑兵王国荣 Dept. of Comput. Dept. of comput. Institute of Math. Sci.

An algorithm for simultaneous comput.tion of the adjoint G(s) and determinant d(s) of the matrix polynomial s2J-sA 1-A 2 is presented, where J is a singular matrix. Both G(s) and d(s) are expressed relative to a basis... 详细信息

关键词： adjoint, determinant, inverse matrix, orthogonal polynomial.

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Routing in LEO-based satellite networks

Routing in LEO-based satellite networks

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1999 IEEE Emerging Technologies Symposium - Wireless Communications and Systems, ETWCS 1999

作者： Gounder, V.V. Prakash, R. Abu-Amara, H. Comput. Sci. Program Texas Univ. at Dallas RichardsonTX United States Comput. Sci. Program NORTEL Networks RichardsonTX United States

ISBN: (纸本)0780355547

Several strategies have been proposed for routing in a low Earth orbit (LEO) satellite system. Some of them are based on the Internet protocol (IP) and a few on asynchronous transfer mode (ATM) switching. However, issues like memory requirements of the satellites in the LEO network and the overheads involved in transmitting packets over the network have tended to be ignored. This paper focuses on developing an efficient solution to the routing issue in a LEO network. It also discusses the issue of the placement of the network operations and control centers (NOCC) required to support the satellite system. © 1999 IEEE.

关键词： Internet protocols

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SOLUTIONS TO THE MINIMIZATION PROBLEM OF FAULT-TOLERANT LOGIC-CIRCUITS

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IEEE TRANSACTIONS ON comput.RS 1992年第4期41卷 429-443页

作者： BARBOUR, AE Dept. of Math. & Comput. Sci. Georgia Southern Univ. Statesboro GA USA Abstract Authors References Cited By Keywords Metrics Similar Download Citation Email Print Request Permissions

This paper investigates the optimization problem of a general approach for designing fault-tolerant circuits. The gate minimization problem is solved so that optimal design with respect to the numbers of gates and levels is obtained. The concept and properties of block design are used to formulate, solve, and construct the optimal form. The gate minimization problem of a fault-tolerant circuit is formulated and a lower bound to the number of minimum gates for any design is established. For certain design parameters, explicit minimum solutions are given. When no minimum solution is found, sets of explicit block designs which produce near minimum designs are characterized. In both cases, minimum and near minimum algorithms which generate the blocks required to construct the logic for fault-tolerant circuits in linear times are devised. If a block design does not have any connection with the minimum or near minimum classes, an approximation algorithm which generates near minimum blocks in a polynomial time is suggested. The minimization techniques devised in this paper are more efficient than the minimization techniques developed to minimize the number of gates in a general switching circuit.

关键词： BLOCK DESIGN ERROR MASKING FAULT-TOLERANT GATE LEVEL DESIGN MINIMIZATION OPTIMAL DESIGN REDUNDANCY RELIABILITY SYSTEM LEVEL DESIGN

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A NEW APPROACH FOR THE PERFORMANCE ANALYSIS OF A SINGLE-BUS MULTIPROCESSOR SYSTEM WITH GENERAL SERVICE TIMES

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IEEE TRANSACTIONS ON comput.RS 1993年第3期42卷 358-362页

作者： VANDELIEFVOORT, A SUBRAMANIAN, N Comput. Sci. Telecommun. Program Missouri Univ. Kansas City MO USA

The linear algebraic approach to queueing theory is applied to analyze the performance of a typical single-bus multiprocessor system. This system can be modeled as an M/G/1//N queueing system with load-dependent arrivals. The method presented requires only that the nonexponential service time distribution for the system be a matrix-exponential, that is, one with a rational Laplace transform. Using linear algebraic techniques, expressions are obtained for the performance characteristics of interest, such as the processing power for the multiprocessor system. The algorithm does not rely on root finding and can be implemented using symbolic programming techniques. The explicit closed form expression for the processing power is presented for some special cases.

关键词： LINEAR ALGEBRAIC QUEUING THEORY MULTIPROCESSOR SYSTEMS PERFORMANCE MODELING AND ANALYSIS PROCESSING POWER NONEXPONENTIAL SERVICE TIMES

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