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최기용,이상율 한국 항공대학교 항공산업기술연구소 1996 航空宇宙産業技術硏究所 硏究誌 Vol.6 No.-
The characteristics of underwater welding of SWS400 steel were investigated. The bead-on-plate type welding using ilmenite type electrode (E4301) was performed by varying welding currents and the sizes of electrodes used. The amounts of hydrogen absorbed by the weld metal were measured using JIS Z3113 specification and the results were interpreted in terms of the cold cracking behaviors of the welded steel. The microstructural changes as well as the microhardness distribution after underwater welding were also investigated using Vickers microhardness tester and scanning electron and optical microscopy. The results indicated that the cold cracking could be avoided by welding under low current with an electrode with a small diameter.
吉基烈 群山大學校 1981 論文集 Vol.2 No.-
The manpower indispensible for promoting the economic and industrial development should be cultivated on the basis of the mutual cooperative relations among the government, schools and industries. In this view-point this study is aimed at not only understanding the current training situation of the manpower besides its supply and demand but also examining the problems regarding today's, manpower policy and how to cope with the foreseeable conditions of the supply and demand in manpower.
養液裁培에 의한 상추의 物質生産 및 光合成에 特性에 關한 硏究
許煇,柳慶烈,崔基準 충북대학교 농업과학기술연구소 1993 農業科學硏究 Vol.10 No.2
These experiments were carried out for three terms (1st : 5/23-6/28, 2nd : 8/14-9/l9, 3rd : 9/20-l1/11) to investigate the rate of Dry Matter Production and Photosynthesis of hydroponically cultivated lettuce. The results were obtained as follows : 1.The number of Lettuce leaf in each culturing term was higher in the third term than in others and the emergence rate of the 1st term was the factest one. 2.Among the terms, the photosynthetic activity was in its highest in the 1st term. Progressing curve of photosynthesis during the day showed similar patterns but the highest rate of photosynthesis occurred at noon in the first term, 1 P.M. in the second term, and 11 A. M. in the third term. 3.Fresh weight of the 3rd term increased to 158% compared to that of the 1st term. However, that of the 2nd term decreased to 54% and the rate of dry weight and of specific leaf area decreased, too.
옵션시장에 있어서 내재변동성의 비대칭적 반응에 관한 연구
옥기율 ( Og Gi Yul ) 한국파생상품학회 2003 선물연구 Vol.11 No.2
This paper examines implied volatility asymmetries in KOSPI200 option markets. The empirical results shoe that the unexpected negative return has a more remarkable effect on implied volatility than the unexpected positive one in the early stages of markets. In the recent stages, markets do not show implied volatility asymmetries. These results give and interesting implication to option market participants. In addition, this paper examines whether trading activity in option markets has an effect on implied volatility. The paper finds that in the second stages of markets trading activity has a negative effect on implied volatility while trading activity do not have effect on implied volatility in the early stages of markets. When trading activity is partitioned into expected and unexpected components, the empirical result shows that all trading activities have a significant negative effect on the implied volatility of option markets.
Reviews : Establishing Application System of KOMPSAT-1
GI Hyuk CHoi,Joo Hee Lee,Hong Yul Paik 大韓遠隔探査學會 1999 大韓遠隔探査學會誌 Vol.15 No.4
Korea Multi-Purpose Satellite-1 (KOMPSAT-1) has been developed by the Korea Aerospace Research Institute (KARI) with the aid of TRW and will be launched on the December 21, 1999 at the Vandenberg Air Base in CA, U.S. Now, the satellite application group in KARI is preparing for the service with the KOMPSAT-1 satellite data. For the purpose of supplying good service to the users, data application planning has to be established before launching satellite. To use satellite data effectively, KARI makes a plan for data policy, data price, mission planning, and commercializing strategy. This study was carried out with the purpose of effective use of satellite data. For this purpose, KARI, first, made 60 user groups to use KOMPSAT-1 data for public welfare and research sectors. These user groups include government, public corporations, institutes, and universities. KARI will offer the service to users through online using Internet. Secondly, KARI made a policy for the priority of KOMPSAT-1 missions. These are classified by the mission priority, payloads, and operational states etc. Thirdly, KARI will make data policy and data price of KOMPSAT-1 based on the basic master plan. Especially, data price will be determined at the KOMPSAT-1 committee including Ministry of Science and Technology (MOST). KARI is also trying to commercialize the data with the domestic and foreign companies to expand the use of KOMPSAT-1 data in the industries sector. Afterward in this study, KARI will continue the improvement for the effective distribution of KOMPSAT-1 data for all users.