슬랙모선의 영향을 고려한 손실 재분배 조류계산 알고리즘

임한석,박시우,신중린 건국대학교 산업기술연구원 1995 건국기술연구논문지 Vol.20 No.-

In the conventional power flow calculations, the slack bus is defined to undertake the total transmission loss for convenience of the numerical viewpoint. This is an unrealistic assumption because, in real power system, the transmission loss is supported by all the generators. Generally the assumption may take little difficulty in power system studies, however, in certain cases such as voltage stability study the results of power flow calculation can be distorted from real ones. This paper proposes a new loss redistribution method that can alleviate a charge of slack bus. In the proposed method, the system power loss redistribution algorithm is added to the conventional power flow calculations and jacobian elements related with the real power are newly constructed. In each iteration step, the power output of each generator is corrected to improve the redistribution scheme of system power loss. Finally the usefulness of proposed method are tested through the some appropriate case studies.

지구과학 학습용 Computer program 연구 : 고등학교 지구과학Ⅰ 제1단원을 중심으로 Centering around the First Unit of Highschool Earth Science Textbook Ⅰ

尹世重,金在炫,崔錫源 공주대학교 사범대학 과학교육연구소 1984 과학교육연구 Vol.16 No.1

A Computer program which could be used for teaching material in new curriculum of highschool earth science course was programed with Goldstar Co. model FC-100 personal computer in BASIC language. The main contents of this program are calculation of radius, mass, average density, the acceleration of gravity of earth and evidences for rotation of earth etc. All these substances are explained with Korean or English and by means of derivation of formula, calculation or dynamic graphs.

탁구 선수의 경기력 수준과 성별에 따른 시합 시점별 대처 반응 변화에 관한 연구

김규석,남중웅 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.5

The purpose of this study was to investigate the changes of coping response for each point of time of a competition according to a performance level and gender. 154 high school table tennis players(male 81, female 73, superior 43, inferior 111) who participated in 20th President Flag table tennis tournament were selected for this study and KASCS(Korean Athlete Sport Coping Scale) questionnaires were used to measure problem focused, emotional focused, detached, avoidance coping factor. The results were as followings. 1. The change of coping response according to a performance level and the point of time of a competition statistically showed each significant difference by performance level, the point of time of a competition, interaction effect of a performance level and the point of time of a competition in problem focused coping factor and detached coping factor. Superior plays were higher than inferior players in problem and detached coping factor. 2. The change of coping response according to gender and the point of time of a competition statistically showed each significant difference by gander and the point of time of a competition in problem focused coping factor and emotional focused coping factor, and in terms of avoidance coping factor there was a statistical significant difference by the point of time of a competition Male players were higher than female players in problem and emotional coping factor.

고속접지스의치를 채용한 초고압선로의 적응재폐로 방식의 성능평가

임한석,신중린 건국대학교 산업기술연구원 1998 건국기술연구논문지 Vol.23 No.-

This paper presents the performance evaluation of HSGS(High Speed Ground Switch)-ARS(Adaptive Reclosing Scheme) for EHV transmission. For the evaluation, authors accomplish the implementation of ARS with HSGS on EHV system by utilizing the functions offered in EMTP. Some case study with sample system and practical system are tested for the simulation to dertemine the performance of proposed implementation scheme. The simulation results are compared with those for the conventional reclosing scheme and discussed. This study may be helpful for the selection of appropriate reclosing scheme for EHV Transmission network.

PPG와 MDI를 이용한 Polyurethane Ionomer의 합성과 전기전도성에 관한 연구

맹기석,송해영,김동철,백중현 忠南大學校 産業技術硏究所 1988 산업기술연구논문집 Vol.3 No.1

Hydroxyl-terminated polyether polyurethanes based on 4,4′-diphenyldiisocyanate(MDI), N-methyldiethanolamine(MDEA) and polypropylene glycol-2,000(PPG) were synthesized with constant level of hard segment. The tertiaryamine of MDEA was sulfonated with r-propane sultone thereby converting the polyether polyurethane to a polymeric Zwitterion. Electrically conducting polyurethane ionomer film was prepared by introducing copper sulfate. The CuxS-induced electrical conducting of polyurethane ionomer film was higher by order 10⁴ than that of the original film. The morphology of CuxS-induced PU, PUI film surface was investigated with SEM.

한국에 있어서의 알레르기성 호흡기질환의 기인성 진균 : A Clinical Study on the Offending Fungal Allergen of Allergic Respiratiory Diseases in Korea

姜?榮,李重根 中央醫學社 1977 中央醫學 Vol.33 No.6

The offending fungal allergens in six hundred twelve cases of korean patients (male 344 cases, female 268 cases) with allergic respiratory diseases such as bronchial asthma and allergic rhinitis were analyzed by the intradermal skirt test with diagnostic standard allergen extracts. The incidence of positive skin test in allergic respiratory diseases were 67.6 % : 66.7% in bronchial asthma, 67.8% in allergic rhinitis and 89. 5% in combined. Cases. In allergic respiratory diseases, the incidence of positive skin tests against one species of fungus was 50.5%, 42.5% against 2^-3 species, 5.8% against 4?6 species, and 1.2%' against 7?9 species respectively. In allergic respiratory diseases, the incidence of the positive skin reactions to fungal extracts were: 27.1% against Candida albicans, 19. 3% against Trichophyton species, 8.7% against Rhizopus nigricans and 7.5% against Fusarium species.

송전손실보정에 의한 Newton-Raphson 전력조류계산법의 확장

신중린,임한석 건국대학교 1994 學術誌 Vol.38 No.2

Newton-Raphson(NR) method is the famous Power Flow calculation technique, and normally used due to its rapidness of numerical convergency. In the conventional NR method, however, there is a somewhat unrealistic assumption under which all the system transmission losses are considered to be supplied by the slack bus generator. In this study, a new approach for handling the losses and augmenting the conventional NR method is proposed. The proposed method estimates the incremental changes of active power on each generation bus with respect to the total system power loss, and the estimated value are used to update the slack bus power. By doing this is improves the performance of power flow calculation, especially for the critical situation which is close to voltage collapse point and thus has relatively large transmission loss.

전력계통의 고조파 실태조사를 위한 설문서 설계에 관한 연구

최규하,신중린,임한석 建國大學校 附設 産業技術硏究所 1993 논문집 Vol.18 No.-

A design of survey form is studied for the investigations of technical aspects and/or social effects caused by harmonics on the electric power system of Korea. The survey form is aimed to have the function of investigation for the current status of harmonics problems on the power system, as well as the function of giving further understanding of the problems to the field engineers and customers in related sphere. The proposed survey form will give some contribution to build up nation-wide countermeasures to the harmonics problems.

외력진동수가 리츠해석법에 미치는 영향

예광일,박중석,노필성,김재웅 동아대학교 건설기술연구소 1998 硏究報告 Vol.22 No.1

The fact that with appropriate selection of the Ritz shapes, only a few of them can be used to represent adequately the response of the original system can be utilized very effectively in the forced response analysis of multi-degree-of-freedom systems. Obviously, a desirable set of Ritz vectors will be one that can adequately represent the spatial distribution of load by the superposition of a minimum number of shapes. It has been demonstrated that dynamic analysis based on Ritz vectors, which are generated by taking into account the spatial distribution of the load yield results which are more accurate than the use of the same number of exact mode shapes. However, because the dynamic response is influenced strongly by the exciting frequency, the exciting frequency in the use of Ritz analysis method is of considerable importance. In this paper, the influence of exciting frequency on Ritz analysis method is compared with mode superposition method with respect to displacement errors and base shear errors.

步速變化에 따른 미끄러짐의 생체역학적 연구

서국웅,윤양진,서국은,이중숙,김용재,이언석,이훈식 釜山大學校 附設 體育科學硏究所 1992 體育科學硏究所 論文集 Vol.8 No.-

The purpose of this study was to analyze walking steps to prevent unnecessary energy consuming and prevention of injury from sliding when someone was walking. The questionnaire, high speed video system, E.M.G. system, and force platform system were used to analyze sliding mechanism in biomechanical perspective. Several results were found as following: 1. According to questionnaire regarding sliding, 93.3% of participants have sliding experiences. People have sliding experiences by greasy floor(48.4%) and obstacle (22.5%). Sliding types were found from different kinds of shoes such as sneakers (48.8%) and boots (34.2%). The results were presented as following 44.6% of participants were fall down front direction and 40.3% of people fell down rear side. 2. According to the high speed video system analyzer, step sliding increased with increasing step speed from distance and acceleration speed experiment with 80 steps/min, 100 steps/min, 120 steps/min. Also, the most sliding were occurred with sneakers, boots, and bare feet as order. 3. According to E.M.G. test results, the vastus lateralis M., the vastus medialis m., and the tibialis anterior m. of electric action potential presented strongly when participants fell front, rear, and right side. The vastus lateralis m. and the tibialis anterior m. of electric action potential presented strongly when someone fell left side, but the vastus medialis m. and the gastrocnemius m. of electirc action potential presented as weaker. 4. According to the force platform test results, the most big change of floor antipower of x-axis presented when someone fell the left side. The most of big change of floor antipower of y-axis presented when someone fell down rear side. The most of big change of floor antipower of z-axis presented similarly when someone fell the front, rear, left, and right side.