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최신 산업동향을 고려한 공업단지 사용량 원단위 분석 연구
김기범,유영준,최우진,구자용,Kim, Kibum,Yu, Youngjun,Choi, Woojin,Koo, Jayong 대한상하수도학회 2017 상하수도학회지 Vol.31 No.5
This study derived the unit of industrial water usage reflecting the latest industry trends. Available for establishing plans such as the master plan for water supply system and analyzed changes in the basic unit by a comparison with the current basic unit values. This study analyzed 4,038 samples with a sampling error of less than 1.5 % at the 95 % confidence level after removing outliers according to a log-normal distribution. As a result, the unit of industrial water usage per site area in the whole manufacturing industry was 7.11 m3/1,000m2/d. The ten industrial categories (C10, C13, C20, C21, C22, C25, C27, C30, C32, C33) showed a similar unit value compared to before, and the four industrials categories (C11, C17, C22, C31) showed a more unit value than before. With regard to the nine industrial categories (C14, C15, C16, C18, C19, C24, C26, C28, C29), the unit value decreased. Cases that companies examined before were the same as the companies examined in this study were analyzed. The result that the changes in the unit industrial water usage were reasonable was obtained. However, in some industrial categories (C17, C14, C24, C29), the unit value was changed by a small number of companies with large-scale water use or unit value of sampling had a large deviation. It was considered necessary to survey them periodically. The unit of industrial water usage derived by the survey in this study reflects the current industrial trends in 2016. Water use in manufacturing companies has continuously changed by the development of manufacturing technologies and simplification of manufacturing processes. In order to deal with this, it is considered necessary to survey the usage of industrial water periodically from a long-term perspective.
터보 제트 엔진의 수중성능시험을 위한 엘보우형 흡입덕트 유동 해석
김구(GU Kim),고성희(Seonghee Kho),기자영(Jayoung Ki),유영준(Youngjun YU),이은택(Euntaek Lee) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.11
터보 제트 엔진의 수중성능시험 시 대기 중 공기를 엔진으로 원활하게 흡입시키기 위해 흡입덕트를 엘보우 형으로 제작하였으며, 이를 모델링하여 유동해석을 수행하였다. 굴절구간을 지난 유동에서 비균형적인 축 방향 속도분포가 관찰되었다. 하류 쪽으로 진행될수록 불균형의 경향은 뚜렷하게 관찰되고 더욱 심화됨을 알 수 있었다. OpenFOAM과의 비교해석결과를 비교해보면, 정성적으로 비슷한 결과를 보이지만 정량적으로는 다소 차이를 보임을 알 수 있었다. As an experiment in the water of turbo jet engine, elbow intake duct was needed in order to suck Oxidizer in the atmosphere into the intake duct, which was a reason why the modelling for calculation was made. As a results, the unbalanced flow observed in the section of elbow. As a flow progressing to the downstream, unbalanced flow was definitly observed. In comparison results between openFOAM and fluent, the results were Qualitatively similar. but, it were Quantitatively different.
김구(GU Kim),고성희(Seonghee Kho),기자영(Jayoung Ki),유영준(Youngjun Yu),정환호(Hwanho Jung) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.5
수중운동체의 설계최적화를 위한 수치해석 기법은 실험값을 보충에 주는 중요한 요소이기 때문에 필수적으로 이에 대한 검증이 필요하다. SUBOFF bare hull에 대한 계산 값과 실험값을 비교하여 일치하는 경향을 확인하였다. DARPA SUBOFF model의 압력분포패턴과 압력계수에 대해서는 solver들간 비슷한 경향을 확인하였다. 항력계수 계산결과, OpenFOAM을 이용한 계산 값이 상용코드 계산값보다 약 10% 정도 큰 값으로 계산되었다. Numerical techniques to optimize an underwater vehicle is important to supply evaluation of experimental values, which have to be verified. The values between experimental values and calculation values are slightly same in SUBOFF bare hull benchmark test. the trends of Pressure distribution and pressure coefficient of DARPA SUBOFF model are almost same. As results of force coefficient, the difference between commercial code and openFoam is about 10%.
윤태희(Yun Tae-Hee),강덕모(Kang, Deuk-Mo),양성해 (Yang, Sung-Hae),유영준(Yoo, YoungJune),김태현 (Kim, Tae-Hyun),강유원 (Kang, Yu-Won) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.1
The object of this study is meaningful for the national aerobic gymnastic players in the review of de-socialization process by retirement and re-socialization process experiencing in the adaptation process for the 2nd vocation through surveying, describing, and analyzing the retirement process and social adaption process of them. The results deduced out of such research process are as follows. First, the motive for the national players starting the workout in the initial stage getting into the aerobic gymnastic world has appeared to be the suggestion of acquaintances, own interest, or purpose to enter the university. Second, the reasons of retiring from the national aerobic gymnastic players, in the stepdown stage from the top, have appeared compositively with various factors of injury, military service, etc. For the national aerobic gymnastic players, third, it has shown that some players had prepared preliminarily for entering the new world, but there are other players who had not at all prepared for the new profession in the vocation preparing process after retirement.