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김선기,방제건,김대호,임익성,양용식,송근우,김용수,Kim, Sun-Ki,Bang, Je-Geon,Kim, Dae-Ho,Lim, Ik-Sung,Yang, Yong-Sik,Song, Kun-Woo,Kim, Yong-Soo 한국재료학회 2008 한국재료학회지 Vol.18 No.11
Oxide effects experiments on massive hydriding reactions of Zr alloy with hydrogen gas were carried out at $400^{\circ}C$ under 1 atm in a $H_2$ environment with a thermo-gravimetric apparatus (TGA). Experimental results for oxide effects on massive hydriding kinetics show that incubation time is not proportional to oxide thickness. The results also show that the massive hydriding kinetics of pre-filmed Zr alloys follows linear kinetic law and that the hydriding rates are similar to that of oxide-free Zr alloys once massive hydriding is initiated. Unlikely microstructure of the oxide during incubation time, physical defects such as micro-cracks and pores were observed in the oxide after incubation time. Therefore, it seems that the massive hydriding of Zr alloys can be ascribed to short circuit paths and mechanical or physical defects, such as micro-cracks and pores in the oxide, rather than to hydrogen diffusion through the oxide resulting from the increase of oxygen vacancies in the hypo-stoichiometric oxide.
김선기,이우영,강흥석,Kim, Sun-Ki,Lee, Woo-Young,Kang, Heung-Suk 한국반도체디스플레이기술학회 2006 반도체디스플레이기술학회지 Vol.5 No.4
This paper shows that the effect of exposing on the top area and a solution which using a water circulation system. Semiconductor substrate stage is made from Aluminum and is repeated the sequence of exposing (150), turning OFF shutter, taking 30 sec. interval at the top area of stage. So the temperature of substrate temperature rises continuously. On this, we made a waterway at the inner part of the substrate stage and operated a water circulation system. We measured the temperature of a substrate stage surface with a thermocouple attached to the substrate stage. To analyze the top area's temperature, we used Analysis Program ANSYS for analysis and 3D CAD program Solid-Works for modeling.
테이블 이동간격 정확도와 위치확인 영상의 정확도 시험용 팬텀의 제작 및 유용성
김선기(Sun Ki Kim),김정훈(Jeong Hoon Kim),서동수(Dong Soo Suh),하동윤(Dong Yoon Ha),임청환(Cheong Hwan Lim) 대한CT영상기술학회 2006 대한CT영상기술학회지 Vol.8 No.1
Purpose In quality control of computed tomography, a film or ruler is used for patient table incrementation test, and crossed large needle for scout localization view test. However, the methods using these instruments can take a low confidence level for scatter ray, careless manufacture, etc. This study is to lift confidence level and simplicity by a new made phantom. Materials & Methods A phantom to measure table incrementation accuracy and scout localization view together was made in our institute. We made a comparative analysis of results by a film, ruler for a experiment of sliding distance of patient’s table and a 18G needle for scout localization view with a new made phantom. Results In a experiment of table incrementation accuracy, the new made phantom with scale showed a more sharpness and simplicity than a method by a film or ruler. In also a experiment for scout localization view, this new phantom with X shape marker showed a more sharpness. Conclusion For experiment of patient table incrementation test and scout localization view in quality control of computed tomography, method by a standardized phantom show higher confidence level and simplicity than film or ruler, and a 18G needle.
김선기(Kim Sun-Ki) 한국지역정보화학회 2001 한국지역정보화학회지 Vol.4 No.2
정보격차는 선진국 뿐 아니라 우리 나라에서도 정보화 추진과정의 중요한 이슈중의 하나이며 특히 지역간 정보격차는 불균형적 국토공간구조 및 지역발전과정과 연관되어 새로운 사회문제로 인식되고 있다. 선진국에서 활성화되어 있는 커뮤니티네트워크는 정보통신기술을 활용하여 지역사회 구성원간의 관계를 강화하고 궁극적으로 전자커뮤니티를 구축하기 위한 혁신운동으로서 정보화 확산에 단절을 보이고 있는 농촌지역의 정보화 수용여건을 획기적으로 개선하기 위한 전략의 일환으로서 의의를 갖는다. 본 연구는 지역간 정보격차에 관한 이론, 실태 그리고 커뮤니티네트워크의 국내외사례 등에 대한 검토를 통해 우리나라에 적용할 수 있는 커뮤니티네트워크의 모형과 실천과제를 제안하고 있다. Digital divide is one of the crucial issues of IT difusion process in Korea as well as developed countries and also is recognized as new social problem in relation to the distorted spatial structure and the uneven regional development. Community network is a community-owned and operated information and communication service that can amplify and support community networking. Community network can playa key role in solving the digital divide problem by identifying new skills needed, developing training and learning programs and delivering training to the community. This paper suggests the introduction of community network concept as the strategic project promoting IT diffusion and solving the digital divide problem in rural areas.
김선기(Kim, Sun-ki) 한국언어문학회 2011 한국언어문학 Vol.78 No.-
Ilyeon wrote pieces of writing about Hyangga by utilizing visible speech styles that were rampant at that time and included them in the Heritage of the Three States. These Hyangga descriptions are made of writers, backgrounds, works and comments, and the number of the comments containing wish fulfillment is 10 attracting the attention. This paper studied the personality of writing and wish fulfillment focusing on the wish fulfillment comments of Hyangga descriptions. As a result, it was checked that Hyangga descriptions have three-stage composition such that ‘when a problem occurred, we made and sang Hyangga to deal with that and the problem was solved as a result’. This paper examined where the power to solve problems is from and which wishes are fulfilled as a result. As a result, it was found that the power to solve problems is from the Hyangga view of Ilyeon, that is the strong impression power, and the cooperation of other assistants and that various problems such as the human world, the nature world, ghosts and so on around the writer were solved by the power and wishes were fulfilled to the expected degree or more. It can be evaluated that a new place for recognition that Hyangga are the literature of hope was opened through the comments on Hyangga by Ilyeon.