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( Hyung Seok Shim ),( Nong Moon Hwang ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.9
The mystery of Goss selective abnormal grain growth (AGG) in Fe-3%Si steel has long remained unsolved since its discovery by Goss in 1933. Similarly, the mechanism of secondary recrystallization, which is commonly observed in many metallic systems, has long been a puzzle. Here, attempts to solve this puzzle are reviewed with a focus on solid-state wetting along the triple junction of polycrystalline metals. Especially, the grains with sub-boundaries of very low energy exclusively have a high probability to grow by solid-state wetting and as a result can grow abnormally. The 3-dimensional Monte Carlo (MC) and phase field model (PFM) computer simulations showed that the presence of sub-boundaries induces AGG. The existence of sub-boundaries exclusively in abnormally-growing grains was experimentally confirmed in Fe-3%Si steel and in 5052 Al alloy. The time evolution of abnormally growing grains by ex-situ observation and electron backscattered diffraction (EBSD) analysis of 5052 Al alloy clearly revealed many microstructural evidences for AGG by triple-junction wetting. Misorientation angle measurements by EBSD of the grains belonging to the penetrating morphology showed that the penetrated grain boundaries have high energy and the penetrating grain boundaries tend to have low energy, in agreement with the wetting condition along the triple junction. Parallel three-dimensional MC simulations starting with the experimental misorientationdata, which consider sub-boundaries and precipitates, show many realistic AGG features observed experimentally. (Received July 28, 2013)
Yun, Jin‐,Mun,Yeo, Jun‐,Seok,Kim, Juhwan,Jeong, Hyung‐,Gu,Kim, Dong‐,Yu,Noh, Yong‐,Jin,Kim, Seok‐,Soon,Ku, Bon‐,Cheol,Na, Seok‐,In WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.42
<P>Solution‐processable reduced graphene oxide as a hole‐transporting layer for highly efficient and stable organic solar cells is reported on page 4923 by Dong‐Yu Kim, Seok‐In Na, and co‐workers. Introduction of a newly reduced graphene oxide by simple solution processing into solar cells dramatically raises the cell efficiency and cell life‐time. The results will allow full use of chemically reduced graphene and will advance the realization of carbon‐based printable optoelectronic devices. </P>
구매의사결정 지원을 위한 실시간 가격비교 Agent 개발
권효석,류정섭,조형래 경상대학교 생산기술연구소 2001 工學硏究院論文集 Vol.1 No.-
The proliferation of the internet and related applications has made users struggle with information overload. It means users must spend more time to find and gather necessary information they want. The agent technique is advocated by many researchers as an alternative to overcome the difficulty, which resulted in the practical use of the agent technique in Electronic Commerce more common. In this paper, we propose a realtime price comparison agent which compares the prices and services among online stores in realtime without users' intervention. The proposed agent differs from the existing ones in that (1) it does not incorporate a pre-installed price database, (2) it automatically monitors users' current status without any input from the users.
개발권양도제도(Transfer of Development Rights)의 국내 적용에 관한 연구
최형석 수원대학교 산업기술연구소 1999 산업기술연구소논문집 Vol.14 No.-
Zoning is very effective and rational in land-use control, but it has no legal mechanisms to compensate wipeouts caused by restrictions on development potentials of private lands. These days, in Korea, the movement to partial release of Green Belts results in unconstitutional issues that stemmed from strong restrictions by zoning, and these restrictions seems to be impossible upheld without compensation. So, it is time to consider the adoption of proper techniques such as TDR(Transfer of Development Rights) to make compensation possible without excessive burdens of public and private sides. This study provides an extensive discussion on the concepts and cases of TDR in United States, and the potentials and limitations of applications of TDR in Korea.
충남 서북부지역 여성의 질세포진 검사에 대한 임상적 고찰
이석민,선우재근,장경택,서수형,김민관,배동한 순천향의학연구소 1996 Journal of Soonchunhyang Medical Science Vol.2 No.2
Pap smear were performed to 30,294 women living in the north-west of Chung-nam. The result are summarized below 1. Positive vaginal cytology was 1.09 percent. 2. 72 percents women in their 30's and 40's experienced vaginal cytology. 3. Vaginal cytology was performed at a decreasing rate as age increases. 4. Positive cytology rate is 2.42% higher than average for elderly women over the age of 65. The present date indicates that pap smear is being widely recognized to be important but they needs to be continued advocacy for pap smear.
Human Chorionic Gonadotropin(HCG)에 의한 넙치, Paralichthys olivaceus의 배정효과
박인석,김형배,최희정,이영돈,손진기 제주대학교 해양연구소 1992 해양자원연구소연구보고 Vol.16 No.-
For the evaluation of hormonal control of sperm in cultured fish a method to quantify the spermiation response of mature flatfish to hormonal therapy is described. Spermatocrit was determined after 30 min. in centrifuge condition of 12,000rpm. Sperm density was estimated by a standard hemacytometer method. However, sperm density can be predicted from spermatocrit since their relationship is linear as described by the re-gression equation. Y=1.14X-0.04 (r=0.91. P<0.0001. n=50), where Y is spermatocrit and X is sperm density. Sperm density levels ranged from 21.5 to 98.4×10^(4) spermatozoa per ㎕ milt corresponding to spermatocrit values of 12 to 95%. Milt production by mature flatfish was highest (7.4ml per kg body weight) at 24h after injection of 1,000IU of human chorionic gonadotropin(HCG) per kg body weight and coincided with low spermatocrit (63%) and sperm density (67.4×10^(4) spermatozoa per ㎕ milt) levels. No significant differences was appeared in milt production, spermatocrit and sperm density between control and HCG-treated fish at 48h after HCG injection. These results demonstrate that spermiation in mature flatfish can be reliably evaluated by a spermatocrit method and that HCG is effective in stimulating of spermiation in this species.
정현석 東西大學校 2000 동서논문집 Vol.6 No.-
This research is concerned with a sensor for detecting the melted oxygen in water. This kind of sensors are used in nuclear power plant(NPP). The melted oxygen can cause the corrosion of pipe line. This means the possibility of disaster of sloping the NPP becomes high. This is the reason for controlling the amount of melted oxygen. But these kind of sensors are imported with high cost and long term delivery. In this research, we developed drawings to make it possible to product oxygen sensors domestically. This result is expected to reduce the cost of maintenance of NPP.
이진 트리의 최적 2-에지 번호매김에 대한 근사 알고리즘
고형대,임형석,박승배 木浦大學校 情報産業硏究所 1998 情報産業硏究誌 Vol.6 No.-
For a given graph G(V.E). labeling on the graph G is a one-to-one mapping of vertices V into distinct integers. d-edge labeling on the graph G is labeling such that each label is a power of d, when the edge label of an edge is the absolute difference between the labels fob end-vertices of edge. d-edge labelings on the special classes of tree such as full binary trees and binomial trees have benn investigated, but 2-edge labeling on arbitrary binary trees has not known up to now. In this thesis, we present the two approximation algorithms of 2-edge labeling on arbitrary binary tress. The time complexities of these algorithms are O(NlgoN) and O(N²logN), respectively. In addtion, we show that the second algorithm obtains the optimal solutions in the every case of experiments.