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윤창원(Chang Won Yoon) 한국열환경공학회 2020 한국열환경공학회 학술대회지 Vol.2020 No.춘계
To mitigate the current energy and environmental problems, sustainable energy carriers alternative to fossil fuels are being explored continuously. Hydrogen has been recognized as a sustainable renewable energy carrier because of its high gravimetric energy storage density of ca. 33.3 kWh·kg-1. However, the low volumetric energy density of gaseous hydrogen limited its use for a number of different energy applications particularly associated with high-capacity and long distance hydrogen transportation. In the regard, a safe and efficient hydrogen storage system that enables to transport mass quantities of hydrogen in a liquid form has attracted significant attention. Promising candidate materials for the purpose include liquid organic hydrogen carriers (LOHCs) and ammonia (NH3). In the presentation, chemical hydrogen storage technology and its potential applications will be discussed.
李鎬京,尹昶元 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-
In the paper, we show that STM-N structure signal of the terrestrial ling is transformed into cell-based signal suitable to the satellite link TDMA slot, and propose a system that assign satellite resources to each ground station, accept the packet type traffic and circuit type traffic of the resources which is assigned to each ground station according to the expecting communication demands, we analyze the traffic capacity performance at each ground station of satellite B-ISDN link by a simply modelled traffic, If 10?? cell loss probabilities in the Queue size distribution for λ value is c=5,7,10 respectively, there are 2.5 cells in Queue on average. As a result, To reduce cell loss probability under 10??, the size of buffer is 12 at least.
A General Method for Cell Formation without Exceptional Element in FMS
Chung, Byung-Hee,Yoon, Chang-Won 崇實大學校 生産技術硏究所 1996 論文集 Vol.26 No.2
Machine flexibility is an essential feature of FMS consisting of multi-functional machines. It refers to the ability of a machine to perform several operation types. In this paper, machine flexibility based similarity coefficient, suitable to the minimization of E.E(Exceptional Element), are developed. We introduce 2 Lemmas to determine the maximum number of cells without E.E., based on machine-operation incidence matrix. New concept for incapability coefficient, based on part-operation incidence matrix, is used to form part families. To systematically form the cells, 2 algorithms using Hungarian method are developed. One is used to determine the maximum number of cell without E.E based on similarity coefficient between machines. The other forms cells considering coefficients of similarity and incapability between machine cell and part. Developed algorithm can overcome both of limitations generated when we consider th similarity among the only independent machines, and the constraint of the problem size.