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파이프라인 프로세서를 이용한 플로우 그래프의 최적화 실현
홍춘표 대구대학교 산업기술연구소 1994 産業技術硏究 Vol.13 No.-
This paper presents a set of techniques to automatically find rate optimal or near rate optimal implementations in pipelined processing environments for DSP algorithms that are represented by recursive shift-invariant flow graphs. An instruction scheduling methodology for a single pipelined processor is presented. In such case, the problem to be addressed is the scheduling of a single instruction stream which controls all of the pipeline stages. The goal of an automatic scheduler in this context is to rearrange the order of instructions such that they are executed with minimum iteration period between successive iteration of defining flow graphs. Since the node execution times in defining flow graphs are deterministic, this research addresses compile time scheduling.
홍춘표,장경영 대구대학교 과학기술연구소 1997 科學技術硏究 Vol.4 No.2
This paper presents a set of design techniques for detecting the bearing of underwater target. Basically the signal processor measures the time delay between two signals that come from the underwater sensors. The bearing is functions of the velocity of underwater sound, the distance between two sensors, and the time delay between sowed. The signal processor designed in this research uses the Polarity Coincidence Correlation (PCC) techniques to measure the time delay between sensors. In such case, to simplify the processor's hardware complexity, the correlation coefficient are obtained only using the phase information instead of phase and amplitude informations. In this paper, we propose a new technique for computing the correlation coefficient, in which the idea is the shifted data storing in memory. This technique is proved to be very efficient and fast, and can easily be extended to the large system. The field test results show that the processor designed in this research can be applicable to small system.
메모리 공유형 다중 프로세서의 동기화를 위한 Spin-Lock 기법의 성능 분석
홍춘표,이종임,남상균 대구대학교 과학기술연구소 1997 科學技術硏究 Vol.4 No.3
Most of the shared-memory multiprocessor system provide a hardware primitive for supporting mutually exclusive accesses to shared data. The hardware primitive consists of instructions that atomically read and write a single memory location. When a processor is accessing a shared data, the lock is set to busy, and other processors must wait until the lock is released. This paper analyse the characteristics of four spin-lock alternatives, and compare the performance of the proposed scheme through the simulation on shared-memory multiprocessor (Sequent-Balance). The simulation results show that all the spin-lock alternatives for synchronization degrade overall performance as the number of spinning processors increases. In addition, a variant of Ethernet backoff scheme shows good performance even for large numbers of spinning processors. Because of its simplicity, backoff scheme has better performance when there is no contention for the lock.
WE DSP32 신호처리기를 이용한 LSP 알로리즘의 실시간 구현
홍춘표,김성한 大邱大學校 科學技術硏究所 1998 科學技術硏究 Vol.5 No.3
This paper presents a set of design techniques for implementing LSP algorithm in real time using AT&T's second generation digital signal processor WE DSP32. This paper reviews the parametric representation techniques of speech signal and the architecture of the target processor. Before the real time implementation, we checked the simulation result of implementing the LSP algorithm in C language. For real time implementation, we used the emulator board having the WE DSP32. For efficient data handling, the circular buffer scheme is used. To satisfy the critical time constraints, we propose a proper programming scheme which meets the deep pipelining characteristics of the processor. The real time implementation result shows that the synthesized speech signal is as good as the original speech signal. In addition, the implementation technique developed in this research can be applicable to speech coding problems.
가상현실 실험이 학업 성취도와 과학 관련 태도 및 창의성에 미치는 효과: 10학년 과학 교과-물질 단원을 중심으로
홍춘표,김용연 한국현장과학교육학회 2010 현장과학교육 Vol.4 No.2
이 연구는 고등학생들을 대상으로 과학 교과 중 화학 단원에 대하여 가상현실 실험 프로그램의 효과를 분석한 것이다. 이를 위하여 3D-Works와 VRML을 이용하여 고등학교 10학년 과학 교과서 내에 있는 화학 단원 중 8가지의 실험 주제로 구성된 가상현실 실험 프로그램을 개발하였다. 고등학교 10학년 126명을 대상으로 3개월간 전통적인 실험 수업을 적용한 통제 집단과 가상현실 실험 프로그램을 적용한 실험 집단에 대하여 적용 전과 적용 후에 과학 교과에 대한 학업 성취도, 과학 관련 태도, 창의성 영역 등에 대한 검사를 실시하였다. 연구결과 가상현실 실험 프로그램은 전통적인 실험 수업보다 학생들의 지적인 영역과 정의적 영역은 향상시키는 것으로 조사되었으나 학습자의 창의성은 거의 향상시키지 못하였다. 앞으로는 좀 더 현실감을 높이고 보다 간단한 사용법과 단순한 프로세스를 가진 가상현실 과학 교과 학습프로그램이 개발되어야 할 것이다. 학습자의 창의성을 향상시킬 수 있는 가상현실 실험 프로그램을 개발하는 것 또한 흥미로운 주제가 될 것이다. The purpose of this study is to analyze the effects of a Virtual Reality Experiment Program(VREP) for high school students. For this study, the VREP was developed by using the 3D-Works and Virtual Reality Modeling Language(VRML). The experiments consisted of eight chemistry experiment items from the 10th grade science textbook. We selected 126 10th grade high school students. They were divided into two groups. Experimental group's students had a VREP aided instruction and control group's students had a traditional explanatory teaching methods for three months. They were tested for science achievement, science related attitude and scientific creativity as a pretest, and then retested as a posttest. The result of this study is that the VREP aided instruction is more significant than the traditional explanatory teaching methods for the science achievement and science related attitude. But VREP was no significant improvement in the scientific creativity. And then we knew that we need to develop more improved science instructional VREP and VR tools which are simpler directions for use and process. Moreover, in the future it will be interesting to develop a VREP that makes improvement for the student's scientific creativity.