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서정범(Jeong Beom Seo),임연택(Yeon Taek Rim),권오상(Oh Sang Kwon),한기봉(Gee Bong Han),유재근(Jae Keun Ryu) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.2
This study was focused on investigation of operational efficiencies in terms of BOD, SS, TN and TP for treatment facility built on-site apartment building. The sequencing batch reactor (SBR) activated sludge process of 40㎥/day capacity was applied for sewage treatment system. The results of the research showed that the sewage flow rate and BOD concentration was particulary high at about 8:00 p.m. and 10:00 a.m., respectively. The average sewage concentration of BOD. SS, TN and TP were 145.4㎎/L, 101.l㎎/L, 33.3㎎/L and 2.8㎎/L, respectively. In operational steady state, BOD removal was observed to be 94.9% on average while SS removal to be 88.2% on average. Denitrification/nitrification were accomplished during SBR processes and average removal rate of nitrogen was 71.8% in terms of total nitrogen. Nitrogen removal was not affected by the winter season. Removal efficiency of phosphorus was 76.9% in terms of total phosphorus. The average effluent concentration of BOD, SS, TN and TP were 8.3㎎/L, 11.4㎎/L, 9.0㎎/L and 0.6㎎/L, respectively. Observed microbial yield coefficient was 0.29gMLSS/gBOD. This experiment may prove that the SBR process can be employed to treat organic matter as well as nutrients in sewage that are generated from such sources as apartment building and community area.
서정범(Seo, Jeong-Beom),박용석(Park, Yong-Suk),홍성철(Hong, Sung-Chul) 한국산학기술학회 2008 한국산학기술학회논문지 Vol.9 No.5
건축 구조물의 진동특성은 시험으로 알아내기가 어렵기 때문에 지진이나 다른 가진에 대항 영향를 미리 평가하기가 매우 어려웠다. 그러나 근래에 들어 해석 기술이 발전함에 따라 건축물에 대한 성능을 예측해 보루 있게 되었다. 건축 구조물의 진동특성 예측은 지금까지는 2차원 평면 해석이 주를 이루었고, 3차원 해석은 이루어지지 않고 있었다. 2차원 해석은 건축물이 비대칭일 때 해석의 신뢰성을 떨어뜨리는 문제를 안고 있다. 본 논문에서는 주거건축물을 3차원으로 모델링하였으며, 지하철 통과시 주거 건축물의 진동 해석을 수행하였다. Since vibration properties of a building structure were not easy to find out through a test, it was very difficult to in advance evaluate an influence of earthquake or other excitations on the building structure. However, currently, along with the development of the vibration analysis technique, it is possible to predict the structural performances of the buildings. The prediction of the vibration properties of the building structure has mainly employed a two-dimensional plane analysis so far, but not a three-dimensional analysis. The two-dimensional plane analysis encounters a reliability problem when the building is asymmetrical. This study has performed a three-dimensional modeling and vibration analysis on residential buildings when a subway passes below.
서정범(Jeong Beom Seo),황창민(Chang Min Hwang) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.7
본 연구에서는 회분식 실험 및 A₂/O 공법의 연속식 실험으로 구리가 생분해, 산소소모율 및 질산화에 미치는 영향을 검토하였다. 본 연구의 결과를 요약하면 다음과 같다. 구리 영향 실험 결과 유기물 분해는 회분식 실험의 경우 구리 농도 4.5mg/L 이상, 연속식은 구리 농도 2.0 mg/L 이상일 때 영향을 미쳤다. 질산화 및 질소 제거의 경우 회분식은 구리 농도 4.5 mg/L 이상에서 질산화에 영향을 미쳤으며, 연속식의 경우 구리 농도 1 mg/L 이상일 때 질소 제거에 영향을 미쳤다. 인 제거의 경우 회분식은 구리 농도 4.5 mg/L, 연속식은 구리 농도 2 mg/L 이상일 때 영향을 미치는 것으로 나타났다. 산소소모율의 경우 회분식과 연속식 모두 구리 농도 1.5 mg/L 이상일 경우 미생물 활성에 나쁜 영향을 주어 산소소모율이 낮아졌다. This study was performed to examine the effect of copper on the biodegradability, nitrification, denitrification and oxygen uptake rate (OUR) using batch reactor and continuous flow stirred tank reactor (CSTR) of anaerobic/anoxic/oxic (A₂/O). The results of this study can be summarized as follows. In the case of the effect of copper on organic treatment, the bad effect initiated when it was above 4.5 mg/L copper with batch reactor and above 2.0 mg/L copper with CSTR. Concerning the case on nitrification and removal of nitrogen, it showed bad effect when copper was above 4.5 mg/L with batch reactor for nitrification and 1.0 mg/L with CSTR for the removal of nitrogen. The bad effect on the removal of phosphorus began when it was 4.5 mg/L copper with batch reactor and 2 mg/L copper with CSTR. In the case of OUR, it decreased as microbial activity was affected when copper concentration was above 1.5 mg/L in both case of batch reactor and CSTR.
활성슬러지 공법의 생분해성 및 침강성에 미치는 염분 농도의 영향
서정범 ( Seo Jeong Beom ),황창민 ( Hwang Chang Min ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.6
This study was aimed at finding out the influence of salinity on the treatability and settleability in activated sludge process. For this, according to salinity, the distinctive feature of organic concentration such as TOC and BOD, sludge volume index(SVI) and observed yield coefficient were examined. The result of batch reactor test showed that the influence of salinity at the high concentration of MLSS was low on the removal efficiency of TOC. On the other hand, the result of continuous flow stirred tank reactor(CSTR) test showed that the TBOD removal efficient was higher the F/M ratio 0.4㎏BOD/㎏MLSS·day than the F/M ratio 0.2㎏BOD/㎏MLSS·day. The influence of salinity on the SVI was found higher the F/M ratio 0.4㎏BOD/㎏MLSS ·day than the F/M ratio 0.2㎏BOD/㎏MLSS·day to 10,000㎎/L of salinity. The test also showed that filamentous microorganism rapidly increased when salinity was l5,000㎎/L. SVI was stabilized in the reactor with F/M ratio 0.4㎏BOD/㎏MLSS·day causing activated sludge more viscous. On the other hand, when the F/M ratio kept at about 0.2㎏BOD/㎏MLSS·day, SVI increased rapidly due to a sludge bulking.
Epidural Injection시술시 투시율 변화에 따른 선량비교연구
서정범,오동훈,이정범,이종웅,Seo, Jeong-Beom,Oh, Dong-Hoon,Lee, Jeong-Beom,Lee, Jong-Woong 대한디지털의료영상학회 2013 대한디지털의료영상학회논문지 Vol.15 No.1
To be investigated and measures to reduce the medical exposure of patients to change the Epidural Injection time Fluoroscopy Pulse Rate in this study. Was conducted in 50 patients who underwent surgery Epidural Injection performed by interventional care of Konkuk University Hospital from January to April 2013. The treatment time with the change of Pulse rate, is measured in minutes fluoroscopy time, and measured the area dose (${\mu}Gym^2$) and depth dose (mGy). Using the Image J program, to measure the PSNR and SNR. The fluoroscopy time as a result surgery, there was no significance in the statistical analysis, and depth dose is 34.3 to 34.9%, was reduced from 35.8 to 38.7% the area dose. It is possible to reduce the appropriate Pulse rate, to reduce the dose without statistical analysis significance fluoroscopy time.