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대학 골프 선수의 Pitching wedge 스윙동작의 운동학적 특성 분석
백진호,윤동섭,김재필,Back, Jin-Ho,Yoon, Dong-Seob,Kim, Jae-Phil 한국운동역학회 2003 한국운동역학회지 Vol.13 No.3
The purposes of present study were to determine the major check-points of golf swing from the review of previous studies, and to suggest additional information on the teaching theory of golf. The golf swing motion of 6 male and female elite university golf players were filmed with 16mm Locam II high speed cameras at the speed of 200f/s, and variables such as time, displacement, angle, velocity were calculated and analyzed by 3D Cinematography using DLT method. The results were: 1. Differences were shown in the ratio of weight distribution on the feet, cocking angle, take-back velocity, club-head velocity at impact depending upon the physical characteristics and club used for swing. 2. Time for the down-swing and impact were $0.27{\sim}0.29s$ in men and $0.29{\sim}0.32s$ in women, which was 1/3 of the time for the back-swing. Women showed longer total swing time than men because of longer time in back-swing, follow-through and finish. 3. Men showed larger range of motion in shoulder and knee joints than women, on the other hand women showed larger range of motion in hip joint than men. 4. Cocking motion and right elbow flexion were occurred at the top of back-swing and cocking release was occurred at the moment of impact. Maximum rotations of shoulder and hip joints were found between the top of back-swing and down-swing phase. 5. Women showed lower back-swing velocity than men, and men showed higher club velocity(men: $38.2{\sim}38.6m/s$, women: $35.1{\sim}36.4m/s$) than women.
인체 무게 중심 분할에 따른 500m 숏트트랙 스피드 스케이팅 출발 기술 분석
백진호,정남주,한기훈,이용구,윤동섭,이용식,Back, Jin-Ho,Chung, Nam-Ju,Han, Ki-Hoon,Lee, Yong-Goo,Yoon, Dong-Seob,Lee, Yong-Sik 한국운동역학회 2003 한국운동역학회지 Vol.13 No.3
The purpose of this study was to attempt new starting motion and supply present starting motion in the 500M short track speed skating according to the center of gravity position. The center of gravity position ratio was divided starting motion into five(type A : front 80%-back 20%, type B front 70%-back 30%, type C : front 50%-back 50%, type D : front 30%-back 70%, type E : front 20%-back 80%). The three dimension motion analysis with DLT(direct linear transformation) method was executed using two video cameras. The following conclusion was that It was appear that reaction and execution time in starting motion was the most short in type B. It was characteristic that step of skaters was shorten and center of gravity position ratio was not effect to change of the step in each event. It was appear that the displacement of type D and type E were longer than that type A and type B during the starting motion. It was appear that skill types of center of gravity position ratio to the front were lower than that to the back and contract a posture. Observing the above, it was conclusion that skill type B of center of gravity position ratio to the tent was more effect than that to the back. But it is important that these skill type was most used to the competition and estimate the result.
외기전담 시스템의 에너지 소비 특성을 고려한 지역별 최적 시스템 구성안 도출
김희정(Kim, Hui-Jeong),윤동섭(Yoon, Dong-Seob),정재원(Jeong, Jae-Weon) 대한건축학회 2015 대한건축학회논문집 Vol.31 No.10
Building latent loads and sensible loads can be controlled through Dedicated Outdoor Air System (DOAS) which is effective in ventilation as well as humidity control introducing 100% outdoor air into the space. Diverse configurations of DOAS are currently used on the basis of ambient conditions and major target control points. The purpose of this paper is to find the most energy conservative configuration of DOAS when applied in Korea. Considering regional climatic characteristics, 3 DOAS configurations are selected to analyze energy consumption in Seoul, Gangneung and Mokpo. TRNSYS 17 program and commercial equation solver are used for energy simulation according to operation modes of each systems. The conventional DOAS composed of enthalpy wheel and sensible wheel showed highest energy saving effect.
열회수형 환기장치의 결로방지를 위한 지역별 예열코일 용량산정 및 분석
김원준(Kim, Won-Jun),김희정(Kim, Hui-Jeong),윤동섭(Yoon, Dong-Seob),정재원(Jeong, Jae-Weon) 대한건축학회 2016 대한건축학회논문집 Vol.32 No.10
Heat recovery ventilator and energy recovery ventilator (HRVs/ERVs) save energy load in buildings by reusing the heat from exhaust air. However, when HRVs/ERVs are operated in winter season, condensation may occur in heat exchange process causing negative influence not only on occupants but also on the performance of the system; mold and bacteria are developed through condensation causing respiratory diseases to occupants, and frosts may be developed once the condensation meets the air with the temperature under the freezing point causing the efficiency of exchangers to drop dramatically or even the breakdown of the whole system. Many methods to prevent condensation or frost have been suggested however preheating may be the simplest and the most certified method to guarantee the performance of the HRVs/ERVs systems. In this paper, variable factors for sizing the capacity of preheating coils have been verified. Also, the appropriate preheating capacity of HRVs/ERVs for different regions in Korea have been suggested based on the frost threshold temperature and the design procedure for various conditions.