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.

Fe―C安定系共晶과 Fe―Fe_3C準安定系共晶의 周期的 成長에 관한 理論的考察

洪俊杓 慶北大學校 1978 論文集 Vol.25-26 No.-

Some theoretical considerations were conducted on the cyclic growth of the stable Fe-C eutectic and the metastable Fe-Fe_3C eutectic. A appropriate growth condition at which a planar solid-liquid interface can be formed may favor the cyclic growth of the two eutectics, and result in the banded structure of mottled cast irons. The solute distributions in the liquid at the solid-liquid interface and the growth time intervals of the two eutectics were calculated in the periodic steady state.

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.

境界要素法에 의한 非定常熱傳達 解析

洪俊杓 경북대학교 공과대학 1983 工大硏究誌 Vol.12 No.-

A boundary element formulation was presented for two dimensional transient heat conduction problems. Comparisons were made between results from this model and those from the finite difference method. It was concluded that the boundary element method which has serveral advantages, such as the wide variety of element shapes, simplicity of data preparation and small CPU times will find wide application as an alternative for the finite difference or finite element methods, in the fields of two or three dimensional transient heat conductions.

WE DSP32 디지탈 신호처리기를 이용한 LPC해석 및 합성 알고리즘의 실시간 실현

홍춘표,황병곤,남인길 대구대학교 (한사대학) 산업기술연구소 1994 産業技術硏究 Vol.13 No.-

The WE DSP32 in AT&T's second-generation programmable digital signal processor with 32-bit floating point arithmetic. This device can be used in a wide varity of complex digital signal processing algorithms such as speech recognition,high speed modems, low-bit rate voice coders, and multichannel signaling system. This paper reviews the LPC analysis and synthesis of speech signal and presents a real time implementation methodology of these algorithms using the WE DSP32. For efficient data handling, circular buffer is proposed. The implementation results show that deep pipelining characteristics of the processor should be fully utilized to satisfy the timing constraints,

볼 엔드밀 가공시 채터가 가공면에 미치는 영향

박춘우,홍남표,김병희 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.A

This paper deals with the study on the culling characteristics in ball-end milling process. First of all, the effects of the geometric cutting conditions such as the spindle speed, feedrates on the surface integrity and machining stability were evaluated by the analytical and the experimental approaches. A large amount of experimental sets are performed to evaluate the effects of chatter phenomenon on the machined surface. The optical microscope and the surface roughness measuring machine are used to measure the surface integrity and roughness of the machined surfaces

태권도체육관 사범들의 직무스트레스 요인 및 직무만족도에 관한 연구

김태홍,홍춘표 한국스포츠리서치 2005 한국 스포츠 리서치 Vol.16 No.2

The purpose of this study was to examine the relationship between Taekwondo masters job stress and their job satisfaction. To accomplish the purpose 86 masters were chosen who working at Taekwondo gymnasium belonging to 'K University Taekwondo Association'. The questionnaire developed by Parker & Decotiis. Ivancevich & Matteson. Schuler was used to measure job stress and job satisfaction. And statistical methods for this study were t-test, one-way ANOVA, Correlation and Regression. The main results of this study were summarized as follow: First. Taekwondo masters' job stress was not particularly high. There was not statically significant differences according to sociodemographic background of them such as sex. school career, a specialty, a certificate of qualification, career, income, status. Second, Taekwondo masters' job satisfaction was not particularly high. There was not statically significant differences according to sociodemographic background of them such as sex, school career, a specialty, a certificate of qualification, career, income. status. Third. there was appeared negative correlation between job stress and job satisfaction of Taekwondo masters. Also, the effect of job stress of Taekwondo masters on job satisfaction appeared reward system, career development and organizational characteristics in regular sequence negatively.

Truncated 사각형 패치에 의한 2 x 2 균일 원편과 안테나 설계

손태호,전홍표 순천향대학교 산업기술연구소 2003 순천향 산업기술연구소논문집 Vol.9 No.1

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Truncated 사각형 패치에 의한 2x2 균일 배열 원편파 안테나 설계

손태호,전홍표 순천향대학교 부설 산업기술연구소 2003 순천향 산업기술연구소논문집 Vol.9 No.1

In this paper, circular polarized 2x2 truncated patch array antenna for GPS system is designed. Proposed 0.8λspacing 2x2 elements are fed by uniform feeding network, and have left handed circular polarization by truncation on side edges to each patches. Epoxy substrate, 1.2mm thickness and 4.75 relative dielectric constant with 0.019 loss tangent, is used to fabricate. Theoretical and tested characteristics as return losses, antenna impedances and radiation patterns on the 1.575GHz center frequency are shown. Measured results are agreed well with theoretical values.

제6차 교육과정에 의한 중학교 과학 교과서의 비교 분석 연구 : 중학교 1학년 과학 교과서를 중심으로 On the First Year of Middle School

오제직,홍춘표,김준식 공주대학교 사범대학 과학교육연구소 1996 과학교육연구 Vol.27 No.1

The purpose of this paper is to give basic data which could be used for re-construction textbooks according to real situation of school in teaching, and could help to write new textbooks. For this study, five kinds of Science textbooks Ⅰ on the 5th curriculum and eight kinds of science textbooks Ⅰ on the 6th curriculum were selected as an analytical material. The methods of study are as follows; We analyzed and compared respectively with Githic type, Figure, Table, Research, Question, Experiment, Observation, Exercise and so forth in eight kinds of Sience textbooks Ⅰ and in average values of five kinds of textbook on the 5th curriculum. 1. The kinds of the Science textbook based on the 6th curriculum and 5th curriculum were respectively 8 and 5. 2. The quantity of new textbooks were much the same as the old textbooks, except for C and H textbooks. 3. It was found out that new textbooks decreased more than old textbooks in number of page of theory and explanation. 4. The number of Gothic type term was showed more Chapter Ⅰ and Ⅱthan other chapter in old and new science textbooks. 5. Figure and Table have intrinsic character-respectively. 6. The number of Study and Figure were unchanged as compared with old textbooks. but its of Table were decreased. 7. The number of Question was also unchanged, but it had almost subjective. 8. The kinds and numbers of experiments were increased as compared with old textbooks, and they had instinctive character respectively. From these analytical results of new science textbooks, we, that is, science teachers should select science textbook well and we should supply a thing of insufficiecy on science textbook in teaching.