• Title/Summary/Keyword: Parallel Integration

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Parallel Integration for Real-Time Simulation (실시간 시뮬레이션을 위한 병렬적분)

  • Lee, W.S.;Samson, J.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.2 no.1
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    • pp.106-115
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    • 1994
  • A parallel integration approach is proposed for real-time simulation of controlled mechanical systems. The proposed approach, which employs the dual-rate integration method in a parallel computing environment, is developed to deal with stiffness and high frequency characteristics of the controlled mechanical systems effectively. Numerical experiments are performed to demonstrate the effectiveness of the approach in shared memory multiprocessors, Alliant FX/8 and Alliant FX/80.

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A Parallel Finite Element Procedure for Contact-Impact Problems (충돌해석을 위한 병렬유한요소 알고리즘)

  • Har, Jason
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1286-1290
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    • 2003
  • This paper presents a newly implemented parallel finite element procedure for contact-impact problems. Three sub-algorithms are includes in the proposed parallel contact-impact procedure, such as a parallel Belytschko-Lin-Tsay (BLT) shell element generation, a parallel explicit time integration scheme, and a parallel contact search algorithm based on the master slave slide-line algorithm. The underlying focus of the algorithms is on its effectiveness and efficiency for inclusion in future finite element systems on parallel computers. Throughout this research, a prototype code, named GT-PARADYN, is developed on the IBM SP2, a distributed-memory computer. Some numerical examples are provided to demonstrate the timing results of the procedure, discussing the accuracy and efficiency of the code.

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Study on the parallel processing algorithms with implicit integration method for real-time vehicle simulator development (실시간 차량 시뮬레이터 개발을 위한 암시적 적분기법을 이용한 병렬처리 알고리즘에 관한 연구)

  • 박민영;이정근;배대성
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.497-500
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    • 1995
  • In this paper, a program for real time simulation of a vehicle is developed. The program uses relative coordinates and BEF(Backward Difference Formula) numerical integration method. Numerical tests showed that the proposed implicit method is more stable in carring out the numerical integration for vehicl dynamics than the explicit method. Hardware requirements for real time simulation are suggested. Algorithms of parallel processing is developed with DSP (digital signal processor).

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A Uniform GTD and Aperture Integration Analysis of the Electromagnetic Scattering by a Semi-infinite Parallel Plate Waveguide with an Interior Termination and Lossy Inner Walls (Uniform GTD와 Aperture Integration을 이용한 내부에 Terminator가 있는 평면도파관의 전자기파의 산란)

  • Myung, N.H.
    • Proceedings of the KIEE Conference
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    • 1987.07a
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    • pp.105-109
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    • 1987
  • A solution which combines ray and aperture integration(AI) techniques is presented for the problem of electromagnetic plane wave scattering by an open-ended, perfectly-conducting, semi-infinite parallel plate waveguide with a thin, uniform layer of lossy or absorbing material on its inner walls, and with a simple planar termination inside. Numerical results are given for the fields outside the waveguide.

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Variable Time Step Simulation and Analysis of Hydraulic Control Systems using Transmission Line Modeling (전달관로 모델링을 이용한 유압제어 시스템의 가변 시간스텝 시뮬레이션 및 해석)

  • Hwang, Un-Gyu;Jo, Seung-Ho
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.5
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    • pp.843-850
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    • 2002
  • This paper presents a simulation method using the transmission line modeling to reduce simulation runtime of hydraulic control systems. This method is based on separating the system components each other using the transmission line elements prior to simulation, which leads to divide the simulated system into several subsystems suitable for an even more efficient integration. It can also handle nonlinearities and discontinuities without flag signal when restarting integration. By applying variable integration timestep to parallel hydraulic circuits via parallel processing, it is shown that simulation run-time can be reduced significantly compared with that of Runge Kutta method.

PASS: A Parallel Speech Understanding System

  • Chung, Sang-Hwa
    • Journal of Electrical Engineering and information Science
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    • v.1 no.1
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    • pp.1-9
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    • 1996
  • A key issue in spoken language processing has become the integration of speech understanding and natural language processing(NLP). This paper presents a parallel computational model for the integration of speech and NLP. The model adopts a hierarchically-structured knowledge base and memory-based parsing techniques. Processing is carried out by passing multiple markers in parallel through the knowledge base. Speech-specific problems such as insertion, deletion, and substitution have been analyzed and their parallel solutions are provided. The complete system has been implemented on the Semantic Network Array Processor(SNAP) and is operational. Results show an 80% sentence recognition rate for the Air Traffic Control domain. Moreover, a 15-fold speed-up can be obtained over an identical sequential implementation with an increasing speed advantage as the size of the knowledge base grows.

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PARALLEL ALGORITHMS FOR INTEGRATION OF NAVIER-STOKES EQUATIONS BASED ON THE ITERATIVE SPACE-MARCHING METHOD

  • Skurin Leonid I.
    • Journal of computational fluids engineering
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    • v.10 no.1
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    • pp.67-72
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    • 2005
  • This research is based on the iterative space-marching method for incompressible and compressible Navier-Stokes equations[1-4]. A principle of parallel computational schemes construction for steady and unsteady problems is suggested. It is analytically proven that convergence of these schemes is unconditional for incompressible case. When the parallel scheme is used the total volume of computations is the sum of a large number of independent and equal parts. Estimation of the speed-up K shows that K > 1000 in ideal case. First results of using the parallel schemes are presented.

Performance Evaluation of Access Channel Slot Acquisition in Cellular DS/CDMA Reverse Link

  • Kang, Bub-Joo;Han, Young-Nam
    • ETRI Journal
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    • v.20 no.1
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    • pp.16-27
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    • 1998
  • In this paper, we consider the acquisition performance of an IS-95 reverse link access channel slot as a function of system design parameters such as postdetection integration length and the number of access channel message block repetitons. The uncertainty region of the reverse link spreading codes compared to that of forward link is very small, since the uncertainty region of the reverse link is determined by a cell radius. Thus, the parallel acquisiton technique in the reverse link is more efficient than a serial acquisition technique in terms of implementation and of acquisition time. The parallel acquisition is achieved by a bank of N parallel I/Q noncoherent correlator are analyzed for band-limited noise and the Rayleigh fast fading channel. The detection probability is derived for multiple correct code-phase offsets and multipath fading. The probability of no message error is derived when rake combining, access channel message block combining, and Viterbi decoding are applied. Numerical results provide the acquisition performance for system design parameters such as postdetection integration length and number of access channel message block repetitions in case of a random access on a mobile station.

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The Effects of Playing Video Games on Children's Visual Parallel Processing (아동의 전자게임 활동이 시각적 병행처리에 미치는 영향)

  • Kim, Sook Hyun;Choi, Kyoung Sook
    • Korean Journal of Child Studies
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    • v.20 no.3
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    • pp.231-244
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    • 1999
  • This study examined the effects of short and long term playing of video gamer on children's visual parallel processing. All of the 64 fourth grade subjects were above average in IQ. They were classified into high and low video game users. Instruments were a visual parallel processing task consisting of imagery integration items, computers, and the arcade video game, Pac-Man. Subjects were pre-tested with a visual parallel processing task. After one week, the experimental group played video games for 15 minutes, but the control group didn't play. Immediately following this, all children were post-tested by the same task used on the pretest. The data was analyzed by ANCOVA and repeated measures ANOVA. The results showed that relaying short-term video games improved visual parallel processing and that long term experience with video games also affected visual parallel processing. there were no differences between high and low users in visual parallel processing after playing short term video games.

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