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SOI 기판 상에 구현된 플래시 메모리의 구현 조건에 대한 프로그램 동작 효율의 의존성
조성재(Seongjae Cho),박일한(Il Han Park),이정훈(Jung Hoon Lee),윤장근(Jang-Gn Yun),김두현(Doo-Hyun Kim),이길성(Gil Sung Lee),이동화(Dong Hua Li),심원보(Won Bo Sim),신형철(Hyungcheol Shin),이종덕(Jong Duk Lee),박병국(Byung-Gook Park) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
It is relatively hard to observe the program/erase operation efficiency in the flash memory device fabricated on the silicon-on-insulator (SOI), since sal MOSFET devices have the floating bodies. This property is quite different from that of bulk devices where the operation efficiency has relatively stronger dependence on the back substrate bias. In this work, the dependency of operation efficiency of sal memory device on implementation factors such as SOI thickness and channel concentration is investigated with the aid of the numerical device simulation.
MLS 가스켙 완전양각의 치수 및 성형공정과 피로수명의 관계
조성산(Sung-San Cho),한병기(Byungkee Han),이정현(Jung-Hyun Lee),장훈(Hoon Chang),김범근(Beomkeun Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A full-bead of multi-layer-steel engine head gasket, taking charge of the dynamic sealing of combustion chamber, is susceptible to fatigue failure. The dependence of full-bead fatigue life on the forming parameters and dimensions of full-bead were estimated with the finite element analysis and the high cycle multi-axial fatigue theory. The results show that the selection of embossing parameters producing less deformation of bead plate increases the fatigue life while the flatting operation has marginal influence. The fatigue life is also enhanced with the increase in the width of full-bead and the radial length of bore-side flat region. However, the dimensional effects are limited due to the snap-through of full-bead.
조성한(Cho Sung-Han) 서울행정학회 2005 한국사회와 행정연구 Vol.15 No.4
Administrative reform policies normally have a strong rhetoric flavour. The increased globalization of reform ideas and measures also enhances the rhetoric aspect of reforms. NPM-related reforms are said to be technical global remedies for the inefficiency of the public sector. However, reforms that are compatible with an cultural traditions are more often furthered or accepted than those that are incompatible. Korean society has been centered on hierarchical collectivism which contrasts with the egalitarian individualism of Western culture. NPM bases its ideological background on neo-libertarianism which has strong individualistic culture context while Korean tend to be collectivistic. It is not possible to change organizational culture that is strongly connected to national culture. Therefore, reformers must conduct a culture and structure diagnosis first. Then, they will get the idea about what kind of administrative reform model fits the culture.
조성산(Sung-San Cho),한병기(Byungkee Han),장훈(Hoon Chang),김범근(Beomkeun Kim),구교남(Kyonam Ku) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A full-bead of multi-layer-steel (MLS) engine head gasket is used to seal the combustion gas. A finite element model has been developed to assess the relation between the forming process and sealability of rubber-precoated full-bead. It is demonstrated that better sealing performance is achieved when excessive deformation of bead plate is avoided during the forming, i.e., with the decrease in punching depth, punch height, punch width and frictional resistance of bead plate against punch and die, and with the increase in width of die cavity.
초지환원용 비육돈 슬러리의 계절에 따른 휘발성유기물과 휘발성지방산 농도 분석연구
조성백,양승학,이경태,박성권,한덕우,최동윤,황옥화,Cho, Sung Back,Yang, Seung Hak,Lee, Kyung Tai,Park, Sung Kwon,Han, Duck Woo,Choi, Dong Yun,Hwang, Ok Hwa 한국초지조사료학회 2014 한국초지조사료학회지 Vol.34 No.2
비육돈사의 슬러리에 함유된 악취물질의 농도를 계절별로 비교하여 초지 및 농경지에 살포되는 분뇨의 악취강도를 예측하고자 수행되었다. 1. 비육돈사의 슬러리에 함유된 휘발성유기물의 계절별 농도 비교 페놀류 중 p-크레졸 농도는 봄, 여름 및 가을에 차이가 없었지만, 페놀, 인돌 및 스카톨 농도는 여름과 가을에 비해 봄에 높았다 (p<0.05). 돼지 슬러리의 경우 p-크레졸과 스카톨이 악취강도에 큰 영향을 주기 때문에 계절에 따른 휘발성유기물의 악취강도 차이는 크지 않을 것으로 판단된다. 2. 비육돈사의 슬러리에 함유된 휘발성지방산의 계절별 농도 비교 휘발성지방산의 경우 악취강도가 높지 않은 단쇄지방산의 농도는 봄철이 여름과 가을보다 높았으나 (p<0.05), 악취강도가 상대적으로 높은 이성체지방산의 농도는 계절별로 숫자적인 차이는 보였지만 통계적인 차이는 없었다 (p>0.05). 계절에 따라 휘발성지방산이 악취강도에 미치는 영향은 높지 않을 것으로 판단된다. 결과적으로 봄철에 악취물질의 농도가 더 높은 것은 온도, 환기 및 돈사내부로 유입되는 물의 양에 의한 것으로 추정되며, 여름철은 슬러리에서 생성되는 악취농도 보다 환기에 의해 휘산되는 양이 많아서 슬러리의 악취농도가 감소되거나 증가되지 않았을 가능성이 있는 것으로 판단된다. 이상의 연구결과를 종합하면 비육돈사의 슬러리를 초지 또는 농경지에 살포하였을 때 계절에 의한 악취강도의 차이는 크지 않을 것으로 기대된다. The objective of this study is to investigate the changes in levels of odorous compounds in pig slurry during different seasons. Slurry from pens of finishing pigs was sampled every 4-wk and concentration of odorous compounds was analyzed. There was no difference in the range of phenols level (123 to 156 ppm) during spring (April to May), summer (July to August) and fall (October to November). The concentration of indoles was higher (P<0.05) during spring (14.3 ppm) than summer and fall (5.4~7.6 ppm). Level of BCFA ranging from 727 to 1,194 ppm was not different at any season. Among SCFA, there was no difference in propionic acid during any season but levels of acetic acid and butyric acid were highest (P<0.05) during spring season. Concentration of odorous compounds in pig slurry was highest during spring season. Interestingly, it tended to be lower during summer season compare to fall. This result might be due to relatively lower ventilation rate in order to maintain a constant temperature during spring season. Further study will be necessary to determine the relationship between the concentration of odorous compounds and ventilation system.