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수중폭기장치에 의한 용수전용댐의 수층파괴 및 수질개선에 대한 연구
전항배,김학성,이태용 ( Hang Bae Jun,Hag Seong Kim,Tae Young Lee ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.2
Yeoncho dam, a small reservoir for industry and domestic water supply, located at Geoje island in the southern part of Korean peninsula was constructed and have been operated since 1979. Odor and taste problem was occurred 2 years after the initiation of storage of water. For the improvement of water quality, forced circulation of water throughout the reservoir was made by using a 5 air-lifters. In this study, the influences of air-lifters operation on the water quality control were investigated by monitoring physicochemical and biological factors. Operation of air-lifters removed odor and taste completely since 1992. During the first year(1992) operation, however, there was evidences of occurrence of algal bloom in spring and autumn due to the turnover of the reservoir, while no significant variations in water quality were detected in 1993. Odor and taste in this case seems to be originated from anaerobic decomposition of benthic decompositions and from algal growth. The forced circulation supplied DO to the bottom layer of the reservoir and prevented the layer from anaerobic condition. Total nitrogen showed apparent decrease right after the start-up of the air-lifters, while total phosphorus(T-P) and Chlorophyll-a showed very high concentrates in the early 1992. The last two parameters were still high even after 1993, however, they showed a tendency of gradual decrease as the operation time prolonged.
전항배,이상형 ( Hang Bae Jun,Sang Hyung Lee ) 충북대학교 산업과학기술연구소 1996 산업과학기술연구 논문집 Vol.10 No.1
Abstract_Roman The sho e of water resourees is expeeted to be more serious with the rapid increaee in population and the industrielization. 54any dams have been constructed and sev 1 dams is schedu1ed to construct a 'tieinally fcr the increased water dem
기능수준과 다양한 정보제공 방법에 따른 뜀틀운동 학습 효과
전항배(Jun, Hang-Bae),정구인(Jung, Koo-In) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.4
The purpose of this thesis was to analyze the differences in the learning effects on those who were provided with information through teachers’ simulation, who were provided with images of athletes, and those who were provided with their own images and the images of athletes after they have completed their exercise. Also this study examines the most efficient way of utilizing the visual resources. To fulfill this purpose, 3 classes of high school in In-Choen, were selected. According to the one-way variance analysis results of the 3 selected classes, they were confirmed as being similar. Consequently, one class(group) was classified as teachers’ simulation, another as the images of athletes, and the other as images of athletes+self-image. The experiment was conducted 10 times within the period of 5 weeks to all groups. In accordance with above mentioned procedure, the author has come to the following conclusion. The class that were shown visual data proved more effective than the one which was provided with only teachers’ simulation. However, the class which utilized the images of athletes proved only effective to students who had superior physical ability and did not help those with lower physical ability. On the other hand, the class that were provided with both athletes’ and self-images proved effective for both group of students. Therefore, the class that utilized both athletes’ and self images proved extremely effective in enhancing the learning capability, with no restraint to the physical ability of individual students. That is because these resources enabled the targeted students to receive accurate information about the newly given task and their movements.
전항배 ( Hang Bae Jun ),전동걸 ( Dong Jie Tian ) 충북대학교 산업과학기술연구소 2015 산업과학기술연구 논문집 Vol.29 No.1
Micro-floc growth at a various rapid mixing condition was investigated with synthetic water sample containing kaolin particles by standard jar tests. The growth and breakup of the micro-floc occurred during the rapid mixing process, and the rapid mixing condition with high intensity and short mixing time was unfavorable for the micro-floc formation. The major factor for micro-floc formation was velocity gradient, G product mixing time (G·t) values. Breakup of the micro-floc happened at G·t values above 30,000. At G·t values below 30,000, most favorable G values were below 300 sec-1. At G values above 400 sec-1 the micro-floc did not grow any more but it broke up at an extended mixing time. Ratio of Group 1 particles (below 8 ㎛) increased at higher alum dose, while those of Group 2 and 3 decreased. The optimum rapid mixing contions for micro-floc (larger than 8 ㎛) formation was at G values below 300 sec-1, t values below 150 sec, at G·t values below 30,000 and alum dose below 20 mg-alum/L, respectively.