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혐기-호기 상향류 필터 공정에서 양식배출수의 질산화 및 탈질 연구
박노백 ( Noh Back Park ),이현영 ( Hyun Young Lee ),김성민 ( Seong Min Kim ),이준상 ( Jun Sang Lee ) 한국수산과학회 2014 한국수산과학회지 Vol.47 No.5
This study induced biological denitrification and nitrification via a biofiltration process with the view of removing nitrogen from land-based fish farm effluent. To achieve this, we operated an aquaculture nitrogen-removal system that includes a denitrification and nitrification reactor [working volume 40 L, flow rate 64.8 L, HRT (hydraulic reten-tion time) 14.8 h, HRT considering recycling of NOx 7.4 h]. In the continuous process, the nitrification rate of am-monium nitrogen exceeded 90% at a steady state and the denitrification efficiency exceeded 80% with recycling to a pre-anoxic reactor. In addition, the pH in the final effluent was lower with a low influent water alkalinity averaging 100 mg/L (as CaCO3). For effective denitrification reactions, carbon must be supplied via particulate organic matter (POM) hydrolysis because of the low C/N (carbon/nitrogen) ratio in the water.
노재구(Jae-koo Noh),김성민(Sung-Min Kim),최윤석(Yun-Seok Choi),김재인(Jae-in Kim),전기량(Gi-Ryang Jeon) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
본 연구에서는 배전선로 점검 우선순위 결정하거나 신규 배전선로 건설 타당성 판단을 위해 선로 부하패턴을 정량화하고 최대부하 발생 분석을 통해 과다 또는 여유용량 보유선로를 찾아내는 방법을 설명한다. 그리고 기존선로의 이용률을 높이기 위한 방법으로 각 선로별 고객부하의 재편하는 방법을 제시하고 시뮬레이션해볼 수 있는 부하재편 시스템을 제안한다.
국가수준 교과학습 진단평가의 수학영역에 관한 문항반응 분석
박지은(Park Ji-Eun),김성민(Kim Sung-Min),이경화(Lee Kyeong-Hwa),노맹석(Noh Maeng-Seok) 동북아시아문화학회 2009 동북아시아문화학회 국제학술대회 발표자료집 Vol.2009 No.5월
The purpose of this study is to judge the adequacy of Diagnostic Test for problems which have submitted in National Level Mathematics Diagnostic Test on Mar. 6, 2008. We have done the Analysis of Item Response through Rasch model that is recently common measuring method of item response theory in the world. It might be difficult to generalize the result for all national students because we have only studied for senior students of middle school in western area of Busan who live relatively harsh educational environment compared to another student. But, we are supposed to know the suitability for Diagnostic Test that each question of National Level Mathematics Diagnostic Test can provide precise information of a private student to analyze consistency and propensity of difficulty through Rasch model. Each sectional difficulty of mathematics that consists of five sections is not accurate as a result of the Analysis of Item Response. Finally, we find out that the discrimination of Diagnostic Test is not clear to get data for the educational level of students because the difficulty of all questions is generally easy to provide exact knowledge for difference among each student.