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하태호(Tae ho Ha),조형한(Hyoung Han Jo),송준엽(Jun Yeob Song),전종(Jong Jeon) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.7
Precision injection mold is an essential element in order to manufacture small and precision plastic lenses used for phone camera. There are many critical factors to meet the requested specifications of high quality plastic lenses. One of the main issues to realize high quality is minimizing decenter value, which becomes more critical as pixel numbers increases. This study suggests the method to minimize decenter value by modifying ejecting structure of the mold. Decenter value of injection-molded lens decreased to 1 μm level from 5 μm by applying suggested ejecting method. Also, we also developed BIS (Built-in Sensor) based smart mold system, which has pressure and temperature sensors inside of the mold. Pressure and temperature profiles from cavities are obtained and can be used for deduction of optimal injection molding condition, filling imbalance evaluation, status monitoring of injection molding and prediction of lens quality.
근적외선 조사 스포츠웨어 착용 시 운동기술 향상과 플라시보 효과
하태호(Ha, Tae-Ho),김성운(Kim, Sung-Woon) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.3
The purpose of this investigation was to determine the extent to which NIR light influenced the golf-putting performance. One-hundred eight college students participated in the study. Four experimental conditions were created: (1) an active group with expectancy instructions, (2) an active group without expectancy instructions, (3) a placebo group with expectancy instructions, and (4) a placebo group without expectancy instructions. Subjects performed 40 acquisition trials followed. ANOVAs with repeated measures on the last factor were performed on the various dependent variables: absolute error(AE), variable error(VE), directional error(DE), and radial error(RE). The results of this investigation revealed significant main effects for Groups on the absolute error(AE) and variable error(VE). Participants in the active group with expectancy instructions and an active group without expectancy instructions group were significantly better than the other placebo groups in the absolute error(AE) and variable error(VE). In conclusion, the placebo effect does not influence motor skill tasks in which perception and cognitive information processing are important.