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관계형 데이터베이스 응용 프로그램 개발 지원 도구 - 오브젝트 입력 흐름도, 데이터 입력 흐름도
전경재(Kyeong-Jae Cheon),이형모(Hyung-Mo Lee) 한국정보과학회 1994 한국정보과학회 학술발표논문집 Vol.21 No.2A
본 논문에서는 데이터베이스를 초기화하는 응용 프로그램을 효율적으로 개발할 수 있는 메커니즘 [오브젝트 입력 흐름도 (OIF; Object Input Flow), 데이터 입력 흐름도 (DIF; Data Input Flow)]을 제안한다. 오브젝트 입력 흐름도는 E/R 다이어그램상의 엔터티 타입과 관계성 타입들을 입력 우선 순위 관점에서 오브젝트로 변환하여 순차적으로 표현하는 흐름도로서 데이터 생성기와 데이터 입력기를 작성하는데 이용한다. 데이터 입력 흐름도는 데이터 입력기가 데이터베이스를 초기화하기 위해 필요한 원시 데이터 화일을 생성하는 흐름도이다.
식품 및 환경, 기타 Single-cathode와 Dual-cathode 미생물연료전지의 탄소원과 질산성질소의 전류발생 특성
장재경 ( Jae Kyung Jang ),이은영 ( Eun Young Lee ),유영선 ( Young Sun Ryou ),이성현 ( Sung Hyoun Lee ),황지환 ( Ji Hwan Hwang ),이형모 ( Hyung Mo Lee ),김종구 ( Jong Goo Kim ),강연구 ( Youn Koo Kang ),김영화 ( Young Hwa Kim ) 한국미생물생명공학회 2011 한국미생물·생명공학회지 Vol.39 No.4
Microbial fuel cells (MFC), devices that use bacteria as a catalyst to generate electricity, can utilize a variety of organic wastes as electron donors. The current generated may differ depending on the organic matter concentrations used, when other conditions, such as oxidant supply, proton transfer, internal resistance and so on, are not limiting factors. In these studies, a single-cathode type MFC (SCMFC) and dual-cathode type MFC (DCMFC) were used to ascertain the current`s improvement through an increase in the contact area between the anode and the cathode compartments, because the cathode reaction is one of the most serious limiting factors in an MFC. Also an MFC was conducted to explore whether an improvement in electricity generation resulted from oxidizing the carbon sources and nitrates. About 250 mg L-1 sodium acetate was fed to an anode compartment with a flow rate of 0.326 mL min-1 by continuous mode. The current generated from the DCMFC was higher than the value produced from MFC with a single cathode. COD removal of dual-cathode MFC was also higher than that of single-cathode MFC. The nitrate didn`t affect current generation at 2 mM, but when 4 and 8 mM nitrate was supplied, the current in the single-cathode and dual-cathode MFC was decreased by 98% from 5.97±0.13 to 0.23±0.03 mA and 8.40±0.23 to 0.20±0.01 mA, respectively. These results demonstrate that increasing of contact area of the anode and cathode can raise current generation by an improvement in the cathode reaction.
Effect of ammonium on the current generation in the microbial fuel cell
장재경(Jang, Jae Kyung),최정은(Choi, Jung Eun),유영선(Ryou, Young Sun),이성현(Lee, Sung Hyung),김종구(Kim, Jong Goo),강연구(Kang, Youn Koo),김영화(Kim, Young Hwa),이형모(Lee, Hyung Mo) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
These studies carried out to know the effect of ammonium on the current generation in the microbial fuel cells (MFCs). MFCs used in the study were enriched with anaerobic digestion sludge and operated for 3 years using artificial wastewater (AWW). When the current was stably generated, ammonium ion with 27.0{pm}0.0, 51.5{pm}0.0, 103.5{pm}0.0mg/L with acetate fed into the anode compartment. The current values under condition included ammonium were changed from its initial 6.30{pm}0.06 to 6.28{pm}0.36, 5.95{pm}0.61, 5.64{pm}0.38mA, respectively. The current value was slightly decreased to 5.64{pm}0.38mA compared to 6.30{pm}0.06mA generated from MFC without ammonium ion in the AWW. But After 3days operating under ammonium concentration with 103.5{pm}0.0mg/L, the current was unstably generated when artificial wastewater without ammonium was fed again. MFC enriched with AWW without ammonium ion was inhibited by high concentration of ammonium. At this time, the ammonium was removed 5.27~16.41 mg per day under all conditions.