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고장력 냉간금형 수명향상을 위한 친환경 Duplex코팅 기술
이태길(Tae-Gil Lee),박동환(Dong-Hwan Park) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
최근에 자동차 강판재질이 고장력화 됨에 따라 냉간 성형시 금형표면에 내압축력과 인장응력 및 측방력이 동시에 발생되면서부터 냉간 금형의 내구수명문제가 핫 이슈화 되고 있다. 이를 극복할 수 있는 방안으로 보편적으로 사용하고 있는 일반 단층코팅을 배제하고 극한하중에서도 금형의 표면층을 지지할 수 있는 Duplex 코팅기술을 적용하여 금형의 내구 수명을 향상시키고자 한다.
해운대 해수욕장에 설치된 해파리 차단망의 수중 안정성 분석
박성욱 ( Seongwook Park ),이동길 ( Dong Gil Lee ),양용수 ( Yong Su Yang ),이형빈 ( Hyung Been Lee ),이경훈 ( Kyoung Hoon Lee ),한민수 ( Min Soo Hahn ),이태화 ( Tae Wha Lee ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.1
The worldwide abundance of various jellyfish appears to have increased in coastal ecosystems in recent years. The enormous jellyfish blooms cause a variety of problems for the local ecology, fisheries, and aquatic-sports in coastal locations. In this study, jellyfish sting protection net was installed to ensure the safety and reduction of the inflow into the Haeundae beach. In order to confirm the stability of the protection net, the tension for protection net was measured from variation of current speed. The periods for maximum tension were observed correspond to the periods of maximum current speed. The maximum tension for protection net was measured up to 4,100 kg. From field evaluations, the jellyfish sting protection net has demonstrated to stability from the current and tide in the Haeundae beach.
제주도대표급 수영 선수들의 그랩스타트의 플랫스타일과 폴드스타일의 운동학적 분석
이태길,류재청 濟州大學敎 體育科學硏究所 1999 체육과학연구 Vol.5 No.-
The study was undertaken to analysis kinematic variances between flat style and fold style in Grab start technique of Cheju representative swimmers. For this the study analysis technique was 3 dimension cinematographic method to 3 swimmers participated in the study. The conclusions obtained after analyse were as follows. 1. Temporal variance was not significant difference statistically between two styles all phases, but showed rather shorter in flat style than fold style. 2. Displacement variable(X. Y. Z) was not showed significant difference statistically between two styles in vertical(Z) and side direction(X) but showed signifcant difference statistically between two styles in P<.05 level. Therefore flat style was more desirable technique considering forward direction. 3. Velocity variable(X.Y.Z) was not showed significant difference statistically between two styles in side(X) and forward direction(Y ), but showed significant difference statistically between two styles in P<.05 level in vertical direction(Z). 4. Angular displacement showed significant difference statistically( PC05 level) in knee and hip joint between two styles. Flat style was more desirable technique Considering moment of inertia of lower leg. 5. Angular velocity was not showed significant difference statistically in knee and hip joint between two styles. 6. Factor influencing to velocity variable was showed very high positive or negative correlation relationship in vertical and forward direction in ready phase commonly in both styles. The correlation was showed very high negative relation between COG velocity of vertical direction in air phase and vertical displacement and COG velocity in forward direction