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신경근 훈련이 기능적 발목 불안정성 축구선수의 자세조절과 점프 수행력에 미치는 영향
양대중 ( Dae Jung Yang ),강정일 ( Jeong Il Kang ),박승규 ( Seung Kyu Park ),이민기 ( Min Ki Lee ),정용식 ( Yong Sik Jeong ) 한국운동역학회 2014 한국운동역학회지 Vol.24 No.3
The purpose of this study was to investigate the effects on jump performance and balance in soccer player with functional ankle instability of difference of neuromuscular training. In 33 male college soccer player with functional ankle instability subjects of this study randomization, combined training group (group I, n=11) , balance training group (group II, n=11) and control group (group III, n=11) that included in the plyometric training and balance training was classified group. The intervention was conducted three times a week for 8 weeks. Before and after intervention, measured in surface area ellipse and countermovement jump and countermovement jump with arm swing. Showed a significant improvement in postural control and jump performance from the combined training group and balance training group compared to the control group. Showed a significant improvement in countermovement jump from the combined training group compared to the balance training group. Combined training and balance training showed the increased jump performance and postural control in soccer player with functional ankle instability.
가스 쿡탑 버너에서 디자인 형상이 배기배출물에 미치는 영향
정용기(Yong Ki Jeong),김영수(Young Soo Kim),양대봉(Dae Bong Yang),김양호(Yang Ho Kim),류정완(Jung Wan Ryu),위재혁(Jae Hyug Wie),임재범(Jae Beom Lim),석준호(Jun Ho Seok),장영준(Young June Chang),전충환(Chung Hwan Jeon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
An experimental study was performed to investigate the effects of configuration of burner and air excess ration on CO & NOx emission characteristics of the cooktop burners which are used extensively. In this study, the combustion characteristics were investigated with the variation of design factor of cooktop turners. The results showed that as the thermal input increases, flammable region go narrower. With the increase of loading height from the cap to grate, the CO emission decrease owing to the reduction of quenching by flame impingement on the load. Additionally, the CO emission increase with angle of main slot, however the NO emission is almost unaffected.
염공부하에 따른 세라믹 화이버 버너의 배기 배출물과 분광학적 특성에 관한 연구
정용기(Yong Ki Jeong),이대래(Dae Rae Lee),김영수(Young Soo Kim),양대봉(Dae Bong Yang),김양호(Yang Ho Kim),류정완(Jung Wan Ryu),Alexander Yun,위재혁(Jae Hyug Wie),장영준(Young June Chang),전충환(Chung Hwan Jeon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
An experimental study was performed to investigate the effects of both non-perforated and perforated ceramic fiber mat on temperature, CO, NO emission and radiation characteristics in porous ceramic fiber radiant burners. Observations of combustion characteristics occurring inside the burner system which was insulated fiber mat, were investigated by measuring emission and radiation characteristics. Combustion was achieved at the excess air ratio of 0.9~2, heat capacity of 1000~3000㎉/h. The local temperature distribution inside the mat and near the glass surface as a function of the equivalence ratio can be reasonably interpreted by the relation of the heat balance in the mat and movement of the reaction zone. CO emissions were found to be strongly dependent on the operating conditions. There was a tendency that CO concentration decreased as the excess air ratio increases. The NO concentration is maximal at the excess air ratio of approximately 1. The both fiber burner exhibit significant both spectral intensity peaks in the bands at 2.5㎛ and 4.0㎛ relatively.