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하수처리장 적용을 위한Semi-카플란 수차가 장착된 마이크로수력발전 시스템
채규정(Kyu Jung Chae),김동수(Dong Soo Kim),천경호(Kyung Ho Cheon),김원경(Won Kyoung Kim),김정연(Jung Yeon Kim),이철형(Chul Hyung Lee),박완순(Wan Soon Park) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.5
소수력발전은 하수처리장 에너지 자립을 위한 효과적인 대안이다. 본 연구는 유량변동이 크고 유효낙차가 낮은 중소형하수처리장(기흥레스피아) 적용을 위해 피치조절형 세미카플란(semi-kaplan) 마이크로수력발전의 적용 타당성을 평가하였다. 가변피치 semi-kaplan 수차는 유량조절을 위한 가이드베인은 생략하고 피치조절형 런너를 장착하여 기계적 결함은 줄이면서 유량변동이 큰 처리장에 특화된 기술이다. 마이크로수력발전 시스템은 설계조건(유량 0.35 m3/s, 유효낙차 4.7 m)에서 90.2%의 수차효율 달성이 가능하였고 발전용량은 13.4 kW로 산정되었다. 설비가동률 74%로 가동 시 연간 약 86.8 MWh 에너지 생산을 통해 2.1%의 에너지 자립이 가능하고 이는 연간 49톤의 CO₂ 감축효과와 맞먹는다. 경제성 평가결과 초기 건설공사비가 200,000,000원 이하인 경우에는 내부수익률은 6.1%, 순현가는 15,539,000원, 편익-비용률은 1.08, 투자회수년은 15.5년으로 경제성이 충분한 것으로 나타났다. Small scale hydropower is one of most attractive and cost-effective energy technologies for installation within sewage treatment plants. This study was conducted to evaluate the potential of a semi-kaplan micro-hydropower (MHP) system for application to sewage treatment plants with high flow fluctuations and a low head. The semi-kaplan MHP is equipped with an adjustable runner blade, and is without a guide vane, so as to reduce the incidence of mechanical problems. A MHP rating 13.4 kWp with a semi-kaplan turbine has been considered for Kiheung Respia sewage treatment plant, and this installation is estimated to generate 86.8 MWh of electricity annually, which is enough to supply electricity to over 25 households, and equivalent to an annual reduction of 49 ton CO₂. The semi-kaplan turbine showed a 90.2% energy conversion efficiency at the design flow rate of 0.35 m3/s and net head of 4.7 m, and was adaptable to a wide range of flow fluctuations. Through the MHP operation, approximately 2.1% of total electricity demand of Kiheung Respia sewage treatment plant will be achievable. Based on financial analysis, an exploiting MHP is considered economically acceptable with an internal rate of return of 6.1%, net present value of 15,539,000 Korean Won, benefit- cost ratio of 1.08, and payback year of 15.5, respectively, if initial investment cost is 200,000,000 Korean Won.
염색체이상의 산전진단시 이용되는 융모막 융모채취에 관한 연구
채규정(GJ Chae),이민아(MA Lee),이용(Y Lee),김승일(SI Kim),진소자(SJ Jin) 대한산부인과학회 1993 Obstetrics & Gynecology Science Vol.36 No.8
Chorionic villus sampling(CVS)is amethod of prenatal diagnosis in the first trimester of pregnancy in which tissus for genetic study is aspirated from the developing placenta by means of a catheter inserted transcervically or transabdominalluy under the guidance of ul-trasonography. CVS has the advantage over second trimester amniocentesis of allowing earlier prenatal diagnosis of genetic and chromosomal disorders in the fetus but the relative safety and diag-nostic accuracy remain unclear. From Apr.1990 to Sep.1992,305 women who they visited Department of Ob Gyn of Chunbuk National University Hospital seeking prenatal diagnosis of chromosomal disor-ders were recruited to compare the safety and diagnostic accuracy of the two techniques. The results obtained were as follows: 1. Failure rate of cytogenetic analysis was 10.9% in CVS and 5.0% in amniocen-tesis(p<0.05) 2. Incidence of pseudomosaicism was 4.1% in CVS and 3.8% in amniocentesis. 3. When placenta(chorionic frondosum) was located on the fundus of uterus, failure rate of CVS was 40.0% (P<0.01), so location of chorionic frondosum seems to play a major role in success of trancervical CVS 4. Fetal loss (<28 wks)occurred 5 cases(3.0%)in CVS and 3 cases(2.1%) in am-niocentesis, but there was no statistical significance(p=NS) As a results, We conclude that CVS is an effective and safe method for early prenatal diagnosis of chromosomal abnormalities, but that it probably entails a slightly higher risk of procedure failure and of feral loss does amniocentesis.
3개의 배양액내에서 생쥐배아의 발달과 Pronase로 처리한 생쥐배아 부화율의 비교 연구
이정헌,고희정,채규정,이기숙,김종덕,Lee, Jeong-Heon,Go, Hee-Jeong,Chae, Geu-Jeong,Lee, Ki-Suk,Kim, Jong-Duk 대한생식의학회 2001 Clinical and Experimental Reproductive Medicine Vol.28 No.3
Objectives: The purpose of this present study was to compare mouse embryo development in 3 commercial media and hatching competence of mouse embryo with or without enzymatic treatment. Methods: Collected 375 mouse embryos were divided into three groups, and then cultured in IVF-20 (G2), Medicult IVF (M3), P-1 (blastocyst M), respectively. Three day mouse morulae were cultured in G2 media treated with pronase. The results were analyzed using Chi-square test, and considered statistically significant when p<0.01. Results: The developmental rate of 2 cell mouse embryo after 72 hours was highest in IVF-20 (G2) among conventional 3 media. The hatching rate of mouse morulae was low when clultured in G2 media without pronase during 48 hours. However, it was higher when cultured in media treated with $1{\mu}g/ml$, $2.5{\mu}g/ml$, $5{\mu}g/ml$ pronase, respectively. Conclusions: Using good media and digestion of zona pellucida with enzymatic treatment improve development and hatching rate of embryo. Therefore, implantation and pregnancy rate could be improved.
김동수(Kim Dong-Soo),채규정(Chae Kyu-Jung),천경호(Cheon Kyung-Ho),김정연(Kim Jung-Yeon),김원경(Kim Won-Kyoung),이철형(Lee Chul-Hyung),박완순(Park Wan-Soon) 한국태양에너지학회 2013 한국태양에너지학회 학술대회논문집 Vol.2013 No.11
A methodology to predict the output performance of small hydropower(SHP) plant using treated effluent in wastewater treatment plant has been studied. An existing waste water treatment plant, located in Kyunggi-Do was selected and the output performance characteristics for these plants were analyzed. Based on the models developed in this study, the hydrologic performance characteristics for SHP sites have been analyzed. Additionally, primary design parameters such as design flowrate, capacity, operational rate and annual electricity production were estimated. The results showed that the flow duration characteristics of small hydropower plant for wastewater treatment plant were significantly different compared with the small hydropower plant for river.