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간호사화 개발을 위한 기능성 신발의 운동역학적 분석 고찰
남기정(Nam, Ki-Jeong),이종훈(Lee, Chong-Hoon),김재필(Kim, Jae-Pil) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.3
The purpose of the study was to verify the effectiveness of designed functional nurse shoes which enhances reduces fatigue. Five participants who were in their 20s were chosen as subjects. Kinematic analysis and EMG(RMS, MDF) were performed to analyze the joint angle and muscular fatigue variables. Results : There are no significant differences in variables. Whereas, functional nurse shoes tends to reduce muscular fatigue thus reducing the risk of getting injured.
LED용 실리콘 봉지재의 경화방법이 신뢰성에 미치는 영향
김완호,장민석,강영래,김기현,송상빈,여인선,김재필,Kim, Wan-Ho,Jang, Min-Suk,Kang, Young-Rae,Kim, Ki-Hyun,Song, Sang-Bin,Yeo, In-Seon,Kim, Jae-Pil 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.10
Encapsulant curing in terms of convection oven leads to thermal induced stress due to nonuniform thermal conductivity in LED package. We have adopted infrared (IR) light for silicone curing in order to release the stress. The light uniformity irradiated on an encapsulant surface is confirmed to be uniform by optical simulation. Shear strength of die paste using IR compared to convection oven is increased 19.2% at the same curing time, which indicates curing time can be shortened. The indentation depth difference between center and edge of silicone encapsulant in terms of convection oven and IR are 14.8% and 3.4%, respectively. Curing by IR also shows 2.3% better radiant flux persistency rate of LED at $85^{\circ}C$ after 1,000 h reliability test compared to convection curing.
이종훈(Lee, Chong-Hoon),남기정(Nam, Ki-Jeong),김재필(Kim, Jae-Pil) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.3
The purpose of the study was to analyze kinematic factors required to the three-point jump shot of the basketball games through 3-D analysis and Foot pressure analysis. Seven university students participated in this study. The results of the study were showed that (1) resultant velocity in the center of mass(COM) was 0.84±0.27 m/s since a player didn`t shot a ball in the highest peak and shot ball at the moment of going up forward and vertical movement. Therefore, it is necessary to find a proper timing to shot a ball; (2) the angular velocity was largely increased in upper arm and fore arm out of the upper-limb segments and the hands had the largest angular velocity since the body is in a fixed situation and angular speed is rapidly increased by the wrist` snap with the rapid movement of upper arm and forearm at the time of release a ball; (3) it is judged that a player can shot a ball at them accurate an high release point when the player collects power vertically to the maximum by keeping GRF to the right and the rear in a proper way and by keeping the body`s balance so that a large power may not be dispersed.
이종훈(Lee, Chong-Hoon),남기정(Nam, Ki-Jeong),김재필(Kim, Jae-Pil) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.6
The purpose of this study was to investigate the change in motion and the load distribution between the front and back squat. With these purposes in consideration, 7 experienced weight lifters peformed both front and back squat. In order to analyze the change in motion and the load distribution of the two types of squat the following variables, ankle joint angle, knee joint angle, body angle, foot pressure, muscle activity using the 3D motion system, foot pressure system and EMG wireless system were compared. Here are the following results. Firtst, for the front squat ankle joint angle at event 2 was smaller but knee joint angle was between the two types of squat there was no significant difference. Second, foot pressure for all phases was no significant difference. Third, all of the phases the Upper muscle EMG values were higher while preforming the front squat. All things considered, the change in motion and the load distribution are different depending on the squat type. It is concluded that the front squat is effective exercise for developing overall muscles and the back squat is go여 for developing the quadriceps strengthening and the stability of upper body.
장민석,김완호,강영래,김기현,송상빈,김진혁,김재필,Jang, Min-Suk,Kim, Wan-Ho,Kang, Young-Rea,Kim, Ki-Hyun,Song, Sang-Bin,Kim, Jin-Hyuk,Kim, Jae-Pil 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.10
Chip on board type white light emitting diode on metal core printed circuit board with high thixotropy silicone is fabricated by vacuum printing encapsulation system. Encapsulant is chosen by taking into account experimental results from differential scanning calorimeter, shearing strength, and optical transmittance. We have observed that radiant flux and package efficacy are increased from 336 mW to 450 mW and from 11.9 lm/W to 36.2 lm/W as single dome diameter is varied from 2.2 mm to 2.8 mm, respectively. Double encapsulation structure with 2.8 mm of dome diameter shows further significant enhancement of radiant flux and package efficacy to 667 mW and 52.4 lm/W, which are 417 mW and 34.8 lm/W at single encapsulation structure, respectively.