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노경보(Kyoung-Bo Ro),유영태(Young-Tae Yoo),오용석(Yong-Seak Oh),신호준(Ho-Jun Shin),김지환(Ji-Hwan Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The Nd: YAG laser process is known to have high speed and deep penetration capability to become one of the most advanced welding technologies. In spite of its good mechanical application due to the poor welding properties. The major process parameters studied in the present laser welding experiment were position of focus, travel speed and laser power.
포스터 : 이러닝 콘텐츠 평가를 위한 시선추적기법 활용 방안
노경보 ( Kyoung Bo Noh ),남상천 ( Sang Cheon Nam ),송기상 ( Ki Sang Song ) 한국컴퓨터교육학회 2012 한국컴퓨터교육학회 학술발표대회논문집 Vol.16 No.2
현재 기관 중심의 이러닝 평가 체제가 개발자와 전문가 위주로 학습자의 요구사항을 반영하지 못한다는 문제점이 꾸준히 제기되어 왔다. 최근에는 학습자의 관점에서 이러닝 콘텐츠를 평가하고 학습자의 의견을 반영하고자 하는 연구가 지속되어 왔으며 이를 위해 설문지, 인터뷰, 비디오촬영, 발성사고법 등의 방법들이 활용되어졌다. 하지만 이들 연구에서 활용된 학습자 평가 방법 또한 제한점을 지니고 있어 이에 본 연구에서는 시선 추적 기법을 통해 학습 과정을 관찰하여 학습자 관심의 우선순위와 학습 정보의 시각적 입력 과정 이해함으로써 기존의 평가 체제와 평가 방법이 지닌 제한점을 보완하고 효과적으로 이러닝 콘텐츠를 설계할 수 있는 방안에 대해 알아보고자 한다.
연속파형 Nd:YAG 레이저를 이용한 SM45C 용접특성
유영태,노경보,오용석 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.2
The Nd:YAG laser in combination with the optical fiber increase the automation and the flexibility of a whole industry. The Nd:YAG laser welding process in one of the most advanced manufacturing technologies owing to its high speed and penetration. This paper describes the weldability of SM45C carbon steel for machine structural use by Nd:YAG laser. Major process parameters were position of focus, travel speed and laser power. The results showed that peneration depth of the weld was increased with increasing applied laser power. Microstructural examinations and calculations and indicated that the microstructure of the laser weld, which experienced very high heating and cooling cycle during welding process. The results of this study provide application possibility of Nd:YAG laser welding for SM45C carbon steel
오스테나이트계 304 스테인레스강의 Nd:YAG 레이저 초점크기와 용접특성
유영태,오용석,노경보 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2
Laser beam welding is increasingly being used in welding of structural steels. The laser welding process is one of the most advanced manufacturing technologies owing to its high speed and penetration. The thermal cycles associated with laser welding are generally much faster than those involved in conventional arc welding processes, leading to a rather small weld zone. The experiments are performed for 304 stainless steel plate applying variation of : laser power(1500~2000W), welding speed (3~5m/min), shielding gas flow rate, presence of surface pollution, with fixed or variable gap and misalignment between the similar and dissimilar and plates, etc. The follow conclusions can be drawen that unlikely laser power, welding speed has a pronounced effect on size and shape of the fusion zone. Increase in welding speed resulted inan increase in weld depth/ welding ratio and hence a decrease in the fusion zone size. The penetration depth increased with the increase in laser power.
오스테나이트계 스테인리스강과 SM45C의 연속파형 Nd:YAG 레이저 용접특성비교
유영태,오용석,노경보,임기건 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.3
Welding characteristics of austienite 304 stainless steel and SM45C using a continuous wave Nd:YAG laser are experimentally investigated. Laser beam welding is increasingly being used in welding of structural steels. The laser welding process is one of the most advanced manufacturing technologies owing to its high speed and deep penetration. The thermal cycles associated with laser welding are generally much faster than those involved in conventional welding processes, leading to a rather small weld zone. Experiments are performed for 304 stainless steel plates changing several process parameter such as laser power, welding speed, shielding gas flow rate, presence of surface pollution, with fixed or variable gap and misalignment between the similar and dissimilar and plates, etc. The Nd:YAG laser welding process is one of the most advanced manufacturing technologies owing to its high speed and penetration. This paper describes the weld ability of SM45C carbon steel for machine structural use by Nd:YAG laser. The follow conclusions can be drawn that laser power and welding speed have a pronounced effect on size and shape of the fusion zone. Increase in welding speed resulted in an increase in weld depth/aspect ratio and hence a decrease in the fusion zone size. The penetration depth increased with the increase in laser power.