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백원계(Won Kye Baek),이경철(Kyeong Chul Lee),김용현(Yong Hyun Kim),여재익(Jai-ick Yoh),신완순(Wan-Soon Sin),고광웅(Kwang-Uoong Koh),김현태(Hyun-Tae Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Physical phenomena occurred when high energy laser is irradiated on materials are very diverse according to power of irradiated energy, wave length, surface state of materials and so on. Especially in this experiments, metallic materials are the main materials on which high energy laser is irradiated. Experiments are divided into two. First, we irradiated continuous fiber laser(wave length is 1.07㎛) on metallic specimen of which size and thickness change according to power intensity. Second, we investigated the effect of water or other coating on specimens without change of size and thickness using CO₂ laser(wave length is 10.6㎛);power is fixed as 250W. In the first experiment, result showed typical heat transfer because irradiance(W/㎠) is lower than 10?W/㎠. The second experiment showed that damage is much more serious when material is coated.
이경철 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.4
This study investigates the effect of aquatic exercise of children with Down's Syndrome, Participants were a male children with Down's Syndrome who were participating in the physical education program at CH - welfare center in Yeok-Sam Dong, South Korea. Research methods for this study was Qualitative research, To achieve the goals of this study, the researcher attempted to apply the phenomenological research approach. The results of this study can be summarized as follows: effects of aquatic exercise could be divided largely into 1)exercise in body, 2) psychological development 3) social development