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총설 : 니켈담지촉매에서 합성가스 제조시 La 조촉매의 영향
황재영 ( Hwang Jae Yeong ),김영국 ( Kim Yeong Gug ),임연수 ( Im Yeon Su ),박홍수 ( Park Hong Su ),함현식 ( Ham Hyeon Sig ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.1
N/A The effect of La promoter on the carbon deposition and catalytic activity in the synthesis gas production with supported Ni catalysts was investigated. Active component was Ni and support was CeO_(2) and the promoter used was La. The reaction was carried out in a fixed reactor at 1 atm and 650~800℃. The catalysts were prepared by two methods, the impregnation method and urea method. The catalysts prepared by the urea method showed 10 times higher surface area than those of prepared by the impregnation method. By the introduction of La promoter in the catalyst system, carbon deposition was remarkably reduced from 16% to 2%. It appears that the promoter facilitates the formation of a stable fluoride-type phase, which reduces the carbon deposition. The best atalytic activity and CO and H_(2) selectivities were obtained with 2.5wt% Ni/Ce(La)Ox catalyst at 750℃, giving 90% methane conversion, 93 and 80% of CO and H_(2) selectivities, respectively.
고정층 반응기에서 합성가스 생성에 미치는 반응온도와 반응물 유속의 영향
김상범 ( Kim Sang Beom ),김영국 ( Kim Yeong Gug ),황재영 ( Hwang Jae Yeong ),김명수 ( Kim Myeong Su ),함현식 ( Ham Hyeon Sig ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.1
N/A The effects of reaction temperature and flow rate of reactants on the methane conversion, product selectivity, product ratio, and carbon deposition were investigated with 13wt% Ni/MgO catalyst. Reaction temperatures were changed from 600 to 850℃, and reactants flow rates were changed from 100 to 200 mL/mim. There were no significant changes in the methane conversion observed in the range of temperatures used. It is possibly stemmed from the nearly total exhaustion of oxygen introduced. The selectivities of hydrogen and carbon monoxide did not largely depend on the reaction temperature. The selectivities of hydrogen and carbon monoxide were 96 and 90% respectively. Carbon deposition observed was the smallest at 750℃ and the largest at 850℃. It is found that the proper reaction temperature is 750℃. the best reactant flow rate was 150 ml/min.
열차승무다이아 생성 자동화를 위한 시스템 개발 및 적용성 분석
윤형석(Hyeong Seok Yoon),강효정(Hyo Jeong Kang),황재영(Jae Yeong Hwang),이재희(Jae Hee Lee),박상미(Sang Mi Park),지상복(Sang Bok Jee),강인석(Leen Seok Kang) 한국도시철도학회 2021 한국도시철도학회논문집 Vol.9 No.2
승무다이아는 열차 승무원의 열차 운행시간, 대기시간 등을 포함하는 근무 시간표를 의미하는 것으로 열차 다이아와 함께 열차 운영을 위한 기본적인 정보이다. 승무다이아의 작성과정은 열차 운영기관의 다양한 제약조건과 경험적 정보 활용 등이 필요하여 상당 부분이 수작업으로 진행되고 있다. 본 연구에서는 제약조건과 목적함수를 활용한 최적화 알고리즘 모형에 의한 승무다이아 자동화 생성 시스템을 개발하며, 사례적용을 통해 시스템의 효율성을 검증하고 있다. 시스템에서 생성된 승무다이아는 실제 수작업 데이터와 비교 시에 총 사업시간이 유사하거나 승무다이아 수 및 미할당 다이아 수가 감소되어 업무 자동화 측면에서 시스템의 활용성이 있음을 확인하였다. The crew diagram refers to the working timetable that includes the business hour and waiting time of the train crew. Together with the train diagram, it is basic information for train operation. The process of generating a crew diagram requires a variety of constraints and empirical information of train operating institutions, and a large part of the process is carried out by hand. This study attempts to develop an automated generation system for crew diagram based on an optimization algorithm model using constraints and objective functions, and verifies the efficiency of the system through a case project. When compared with actual manual data, the total business hours of the crew diagram generated in the system were similar, or the number of crew diagram and the number of unassigned diagram decreased, so it was confirmed that the system is useful in terms of automation of crew diagram configuration.