• International Journal of Contents
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• 제14권3호
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• pp.1-6
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• 2018

For 3D display applications, auto-stereoscopic display methods that can provide 3D images without glasses have been actively developed. This paper is concerned with developing a display system for elemental images of real space using integral imaging. Unlike the conventional method, which reduces a color image to the level as much as a generated depth image does, we have minimized original color image data loss by generating an enlarged depth image with interpolation methods. Our method was efficiently implemented by applying a GPU parallel processing technique with OpenCL to rapidly generate a large amount of elemental image data. We also obtained experimental results for displaying higher quality integral imaging rather than one generated by previous methods.

• 한국신뢰성학회:학술대회논문집
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• 한국신뢰성학회 2000년도 추계학술대회
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• pp.399-404
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• 2000

Redundancy allocation problems have been considered at single-level systems and it may be the best policy in some specific situations, but not in general. With regards to reliability, it is most effective to allocate the lowest objects, because parallel-series systems are more reliable than series-parallel systems. However, the smaller and tower in the system an object is, the more time and accuracy are needed for duplicating it, and so, the cost can be decreased by using modular redundancy. Therefore, providing redundancy at high levels like as modules or subsystems, can be more economical than providing redundancy at low levels or duplicating components. In this paper, the problem in which redundancy is allocated at all level in a series system is addressed, a mixed integer nonlinear programming model is presented and genetic algorithm is proposed. An example illustrates the procedure.

• 한국통신학회논문지
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• 제13권6호
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• pp.370-479
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• 1988

GRAFCET로 기술된 병렬 시퀀스를 갖는 순서논리 시스템을 실현하는 microprogrammable sequential controller의 실현방법을 제시했다. 제시된 콘트롤러는 처리속도 및 가변성의 향상과 ROM 프로그래밍을 용이하게 할 수 있도록 구성되었다. 또한 병렬 시퀀스를 처리할 수 있으므로 제어시스템의 효율을 향상시킬 수 있다. 따라서 많은 입출력 변수를 갖는 industial process나 빠른 처리속도를 요하는 power electronic converter등의 콘트롤러 실현에 적합하다.

• 한국통신학회논문지
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• 제13권6호
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• pp.470-470
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• 1988

GRAFCET로 기술된 병렬 시퀀스를 갖는 순서논리 시스템을 실현하는 microprogrammable sequential controller의 실현방법을 제시했다. 제시된 콘트롤러는 처리속도 및 가변성의 향상과 ROM 프로그래밍을 용이하게 할 수 있도록 구성되었다. 또한 병렬 시퀀스를 처리할 수 있으므로 제어시스템의 효율을 향상시킬 수 있다. 따라서 많은 입출력 변수를 갖는 industial process나 빠른 처리속도를 요하는 power electronic converter등의 콘트롤러 실현에 적합하다.

• 디지털산업정보학회논문지
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• 제8권4호
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• pp.91-98
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• 2012

This paper implements 2X2 MIMO Long Term Evolution (LTE) base station using Software defined radio (SDR) technology. The implemented base station system processes baseband signals on a Graphics Processor Unit(GPU). GPU is a high-speed parallel processor which provides very important advantage of using a very powerful C-based programming environment that is Compute Unified Device Architecture (CUDA). The implemented software-based base station system processes baseband signals through GPU. It utilizes USRP2 as its RF transceiver. In order to guarantee a real-time processing of LTE baseband signals, we have adopted well-known signal processing algorithms such as frame synchronization algorithms, ML detection, etc. using GPU operating in parallel processing.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2000년도 가을 학술발표논문집 Vol.27 No.2 (3)
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• pp.621-623
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• 2000

클러스터를 구성하는 단위 노드로 SMP가 새로운 대안으로 시장에 등장하였다. 이러한 멀티프로세서 클러스터(CLUMP)는 하나의 시스템에 다중 메모리 구조를 가지는데, CLUMP가 가지는 다중 메모리 구조를 효과적으로 사용하기 위해서 본 논문에서는 중첩된 병렬화 프로그램 모델을 제안하였다. 중첩된 병렬화 모델은 중첩된 루프 레벨의 병렬화, 중첩된 태스크 레벨의 병렬화, 그리고 다중 중첩된 병렬화로 나뉜다. 본 논문에서는 중첩된 루프 레벨의 병렬화를 실험대상으로 하여 그 성능을 평가하고 단일 메모리 구조의 병렬화 프로그램과 성능을 비교하였다. 실험 결과 시험한 중첩된 병렬화 모델이 단일 메모리 구조의 병렬화 프로그램에 비하여 좋은 성능을 나타내었지만, 실험대상이 된 루프 레벨 병렬화의 잠재적인 특징으로 인해 실행에 참여하는 노드 수가 많아질수록 성능 향상 폭이 감소하는 결과를 보였다. 프로그램의 성능 향상 폭과 확장성은 문제 크기가 클수록 좋은 특성을 보였다.

• 산업공학
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• 제25권2호
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• pp.153-162
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• 2012

The reliability is defined as a probability that a system will operate properly for a specified period of time under the design operating conditions without failure and it has been considered as one of the major design parameters in the field of industries. Reliability-Redundancy Optimization Problem(RROP) involves selec tion of components with multiple choices and redundancy levels for maximizing system reliability with constraints such as cost, weight, etc. However, in practice both active and cold standby redundancies may be used within a particular system design. Therefore, a redundancy strategy(active, cold standby) for each subsystem in order to maximize system reliability is considered in this study. Due to the nature of RROP, i.e. NP-hard problem, A Parallel Particle Swarm Optimization(PPSO) algorithm is proposed to solve the mathematical programming model and it gives consistently better quality solutions than existing studies for benchmark problems.

• 한국신뢰성학회지:신뢰성응용연구
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• 제1권1호
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• pp.1-8
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• 2001

Redundancy allocation problems have been considered at single-level systems and it may be the best policy in some specific situations, but not in general. With regards to reliability, it is most effective to allocate the lowest objects, because parallel-series systems are more reliable than series-parallel systems. However, the smaller and lower in the system an object is, the more time and accuracy are needed for duplicating it, and so, the cost can be decreased by using modular redundancy Therefore, providing redundancy at high levels like as modules or subsystems, can be more economical than providing redundancy at low levels or duplicating components. In this paper, the problem in which redundancy is allocated at all level in a series system is addressed, a mixed integer nonlinear programming model is presented and a genetic algorithm is proposed. An example illustrates the procedure.

• 전자공학회논문지B
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• 제32B권9호
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• pp.1162-1170
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• 1995

In this paper, we present a message transfer scheme for efficient message passing in the hierarchically structured multiprocessor computer SPAX(Scalable Parallel Architecture computer based on X-bar network). The message transfer scheme provides interface not only with operating system but also with end users. In order to transfer two types of control message and data message efficiently, it supports both of memory-mapped transfer and DMA-based transfer. Dual-port RAMs are used as message buffers, and control and status registers provide efficient programming interface. Interlaced parity scheme is adopted for error control. If any error is detected at receiving node, errored packet is resent by sender according to retry mechanism. In conjunction with retry mechanism, watchdog timers are used to protect infinite waiting and repeated retry. The proposed message transfer scheme can be applied to input/output nodes and communication connection nodes as well as processing nodes in the SPAX.

• 한국항행학회논문지
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• 제14권6호
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• pp.984-989
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• 2010

본 논문에서는 초소형 정밀 마이크로 흐름센서를 설계하기 위해 Java 멀티스레드를 이용한 병렬 프로그래밍 기법을 도입하여 센서 모듈의 성능 분석과 개선이 가능한 병렬처리형 설계 툴을 개발하였다. 연산에 따른 기본 성능을 측정하기 위하여 열운송 방정식에 지배되는 포텐셜 문제를 두 개의 실험모델로 나누어 실험을 수행하였다. 시뮬레이션 결과 네트워크 PC의 수를 증가시키면 이와 비례하는 속도향상 특성이 나타났다. 따라서 본 연구에서 제안하는 병렬화 방안은 대규모 연산모델에도 적용 가능함을 확인하였다.