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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
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(Hang Bae Jun),이영주(Young Ju Lee),이병두(Byung Doo Lee),이종대(Jong Dae Lee) 한국물환경학회 2001 한국물환경학회지 Vol.17 No.3
The effects of prechlorination on diatoms coagulation were investigated. The dominant diatom that caused filter clogging in both Han river and Daecheong lake water sources was Synedra acus. The optimum alum dose for coagulation of Synedra spp. was 1.62 ㎎-Al/L, which was 50% higher than that for optimum turbidity removal. The coagulation pH was above 6.8 and alum dose was above 1.6 ㎎-Al/L(30 ppm), that actually coincided with optimum sweep coagulation zone. As chlorine dose increased, the removal efficiency of slender type diatoms, such as Synedra spp. and Asterionella spp. remained constant or decreased a little. However, the removal efficiency of short cylinder type diatom, such as Aulacoseira spp. and Stephanodiscus spp. increased. The removal efficiencies of Synedra spp. in Daecheong lake water were 32% at chlorine dose of 1.0 ㎎-Cl₂/L, and 72% at 1.2 ㎎-Cl₂/L, respectively. which showed lower than 88% without chlorine. From the Jar-test result using Han river water, the removal efficiency of Synedra spp. was lower up to chlorine dose of 1.5 ㎎-Cl₂/L than that without chlorine, however, it increased at chlorine dose above 3.0 ㎎-Cl₂/L. With SEM`s images after 10 minutes chlorine contact, diatoms cell wall was partly destroyed. The accumulated sludge on the surface of sand filter was sticky lump of alum floc with numerous broken Synedra cells. The broken Synedra cells in sticky lump of alum floc could be formed by both long chlorine contact at low chlorine concentration and hydraulic shear stress exerted during surface and back washing.
MIAP 를 이용한 도시하수의 COD 및 질소 제거특성
전항배(Hang Bae Jun),김병군(Byong Goon Kim),서인석(In Seok Seo),이상형(Sang Hyung Lee) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.1
A Modified Intermittent Aeration Process (MIAP) composed of a intermittent aerobic reactor followed by aerobic and anoxic reactors in series was developed for removal nitrogen from the sewage having low TCOD/T-N ratio easily encountered in local area. The intermittent aerobic reactor of MIAP was operated in the several combinations of aeration/unaeration, such as 15min/15min, 30min/45min and 60min/60min. And organic loading effect on nitrogen removal was studied by adding glucose to the raw sewage. TCOD and SCOD removal was complete in any operating conditions, so the effluent TCOD showed below 30 ㎎/L. T-N removal efficiency was as high as 90% at TCOD/T-N ratio of 8.5 with glucose addition, however, that was lowered to 68% at TCOD/T-N ratio of 5.1 without glucose addition. In MIAP, the consumed COD to denitrify 1㎎ of nitrate was 6.6 ㎎, and total COD requirement to remove l.0㎎ of T-N was 7.8 ㎎. Nitrate in effluent was 12 ㎎/L without glucose addition, and it did not changed much at the different combinations of aeration/unaeration. Removal characteristics of COD and T-N did not changed at the different combinations of aeration/unaeration, however, nitrate was fluctuated at each beginning of the changed operating conditions.
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),이정훈(Jeong Hun Lee),이종대(Jong Dae Lee) 한국물환경학회 1998 한국물환경학회지 Vol.14 No.3
A post-denitrification process which uses the coagulated influent organic matters on the returned activated sludge is proposed to overcome organic deficiency for denitrification. To enhance the coagulation efficiency of influent COD, various experiments were performed for the optimum coagulation conditions with several organic matters and F/M ratios and at the different cultural environments. The activated sludge from a biological nutrient removal (BNR) process operated with sewage was able to remove glucose and soluble COD(SCOD) in the raw sewage by 90%, 63% as SCOD, respectively. SCOD was separated by 1st-order relations in 10minutes, and their reaction constant, k was 0.626 of glucose, 0.285 of sewage, and 0.147 of diluted animal waste. Separation of DOC with molecular weight(MW) distribution by activated sludge was 25% of MW below 1,000, 20% of MW above 10,000. MW between 1,000 to 10,000 did not removed at all. The effects of F/M ratios on SCOD separation rate was not so apparent, but the optimum F/M ratio was 0.2 in this test. Conventional activated sludge operated aerobically removed SCOD and TCOD(Tolal COD) by 40㎎/L and 62㎎/L, respectively. In this case, the overall TCOD removal efficiency was as low as 28%. Activated sludge from DEPHANOX process could remove SCOD and TCOD 42㎎/L and 135㎎/L, respectively, which resulted TCOD removal efficiency up to 68%. The overall TCOD removal efficiency with SBR sludge adapted with sewage was also as high as 68%.