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송용기,김종수 한국경영과학회 2001 한국경영과학회 학술대회논문집 Vol.- No.1(2)
This paper concerns the problem to determine the optimal spare inventory level for a repairable-item inventory system. When an item fails, the failed item is replaced immediately if a spare is available at the base. If there is no spare item available at the base, it is requested as a lateral transshipment to another base that has a stock on hand. If an item is available in none of the bases, the item is backordered until a spare becomes available. We propose an algorithm to find the optimal spare inventory level at each base, which minimizes the total expected cost of the system. The algorithm is illustrated using examples of various sizes.
Yong-Ki Song(송용기),Soo-Yeon Choi(최수연),Hyun-Jung Park(박현정) 융합관광콘텐츠학회 2017 융합관광콘텐츠학회지 Vol.3 No.1
The purpose of this study was to investigate the teaching profession in tourism department of a 4-year-course college. In order to investigate the teaching profession courses and subjects, this study compared the tourism logic & essay courses, the research of tourism textbook courses and tourism teaching methodology, and the theory of tourism education of 6 each 4-year universities. Indeed, this study implemented in-depth interview of focus group, they got the nod from in this fields. Therefore, it will provide some suggestions and implications as the interview results. The teaching training courses has assumed importance for fostering the young generation in tourism department, and it has needed to invigorate the tourism education system. This study intended to investigate the differences in the related education classrooms and to provide some improvement plan. The results of in-depth interviews from focused group, it shows that each course for tourism department needs to set up objectives again, and needs to present the plan of education contents clearly. The interviewees highly emphasized that tourism education courses need to have course identity, the students who prepared for tourism teaching profession can decide clearly what they need to do. The teaching position in the tourism high school has expected high quality of knowledge and skills specially, thus tourism education courses of a 4-year-course college needs to provide for both of them.
CO₂가 함유된 중소규모 가스전을 위한 KOGAS DME Process 연구
모용기(Yong Gi Mo),조원준(Won Jun Cho),송택용(Taekyong Song),백영순(Youngsoon Baek) 한국가스학회 2010 한국가스학회지 Vol.14 No.4
전 세계적으로 온실가스인 이산화탄소 배출을 감축하기 위하여 다양한 노력이 이루어지고 있다. 이러한 상황에서 이산화탄소가 함유된 중소규모 가스전은 LNG로 개발하기에는 경제성이 떨어진다. 특히 가스전에 포함된 이산화탄소를 분리하기 위하여 분리설비가 추가로 설치되어야 한다. 따라서 플랜트 건설비용이 증가하고, 분리된 이산화탄소는 대기중으로 배출되어 온실가스 감축과는 상반되는 결과를 가져온다. 이러한 비경제적인 가스전에 KOGAS DME Process를 적용하면 가스전에 포함된 이산화탄소를 천연가스와 함께 원료가스로 활용할 수 있어 경제성이 높아진다. KOGAS DME Process는 합성가스를 제조하는 Tri- reformer(삼중개질반응기)를 통하여 H₂와 CO로 이루어지는 합성가스를 제조하는데 원료가스로 천연가스와 산소, 스팀, 이산화탄소를 활용한다. 여기서 사용되는 이산화탄소는 공정상 발생하는 이산화탄소를 회수하여 원료가스로 활용하게 된다. 따라서 본 연구에서는 공정상 발생하는 이산화탄소의 발생량과 원료가스로 사용되는 이산화탄소의 사용량 그리고 가스전에 포함된 이산화탄소의 함량을 분석하여 가스전에 포함된 이산화탄소의 활용범위를 연구하고자 한다. The global activities to reduce the CO₂ emission as a greenhouse gas have been various efforts. Under this circumstance, small and medium sized gas field containing CO₂ to develop as LNG is not economic feasibility. Particularly, for the separation of CO2 in gas field, separation facilities should be installed to add. This is and increase in plant construction cost and separated CO₂ emission into the atmosphere is not the result of greenhouse gas reduction. When the uneconomic gas field apply the KOGAS DME process, the gas field containing CO₂ can be increase economic feasibility because of natural gas and CO₂ can be use to resource gas. The Tri-reformer produced syngas as H2 and CO in KOGAS DME process and the resource gases are natural gas, steam, oxygen and CO₂. The CO₂ is used as raw material gases from recover CO₂ in DME process. In this study, we investigated range of application of CO₂ in gas field.
모용기,강민서,송택용,백영순,조원준 한국수소및신에너지학회 2014 한국수소 및 신에너지학회논문집 Vol.25 No.2
Dimethyl ether (DME) is a new clean fuel as an environmentally-being energy resources. DME hassimilar characteristics to those of LPG and can be substituted Diesel fuel. KOGAS has investigated and developednew innovative DME synthesis process from synthesis gas with KOGAS's own technologies. KOGAS had finishedthe construction of 10ton/day DME demonstration plant in 2008, we have established the basic design of commercialplant which can produce 3,000ton/day DME. Specifically, an economic model for a commercial DME project willbe presented. It accounts for all the major cost factors that are considered in a commercial scale project as themodel input for performing cash flow analysis, after which key economic indicators are produced including theinternal rate of return (IRR), net present value (NPV). Sensitivity analysis is performed to identify dominant costfactors to the project economics and quantify their impact. The inputs to the economic analysis will be basedon representative cost factors from the commercial-scale design of KOGAS’ direct DME process supplementedby literature data. Case study results will be presented based on recent commercialization projects.