펄스 주파수 변조 기법을 이용한 형광등 안정기의 파고율 저감 기법

송주호,이동윤,송중호,최주엽,최익,임묘택,Song, Joo-Ho,Lee, Dong-Yun,Song, Joong-Ho,Choi, Ju-Yeop,Choy, Ick,Lim, Myo-Taeg 전력전자학회 2000 전력전자학회 논문지 Vol.5 No.3

형광등의 수명은 형광등 안정기의 시동 시나리오와 형광등 전류의 파고율에 영향을 받는다. 본 논문에서는 특히 파고율을 주로 다루며, 파고율을 줄이기 위한 새로운 방법을 제시하고자 한다. 제안하고자 하는 방법은 펄스 주파수 변조기법(Pulse Frequency Modulation, PFM)을 이용하며, PFC(Power Factor Correction)가 만드는 50% 벨리필 전압 파형을 PFM 제어 신호로 사용한다. 본 논문에서는 제안하는 PFM 제어 기법으로 파고율을 1.7 이하로 낮출 수 있음을 모의 실험과 실험을 통해 확인하여, 제안한 기법의 타당성을 검증한다.

배드민턴 클리어와 드롭 동작에 대한 운동학적 분석

송주호,Song, Joo-Ho 한국운동역학회 2003 한국운동역학회지 Vol.13 No.3

The purpose of this study was to present the basic data on improving the skills for 3 junior high school national badminton players in clear and drop motion through the 3-dimensional image analysis. Therefore, the results of this study are as follows: 1. In the duration times per phase, subject C relatively showed a similar time between clear and drop motion. Accordingly, C took a more effective motion than A and B. 2. In the velocities of racket head, subject A and C showed similar changes relatively. However, in case of subject B, the velocity was decreased before back swing(E2) and increased until impact(E3). 3. Regardless of clear and drop motion, the changing phases of joint angle for wrist and elbow showed similar changes comparatively. 4. In the angles of upper body, clear motion was average 85.0 degree and drop one was average 80.7 degree during the impact(E3). Hence, it showed that drop motion hit the ball bowing the upper body more than clear one. 5. In the angles of racket head, clear motion was average 87.7 degree and drop one was average 85.6 degree during the impact(E3). Consequently, drop motion was impacted forward more than clear one.

링 종목 Jonasson 동작의 운동학적 연구

송주호(Song, Joo-Ho),박종훈(Park, Jong-Hoon) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.4

The purpose of this study is to identify the key steps and phase-optimized kinematic variables of the ring event Jonasson(double salto fwd. piked to hang) technique and to identify the kinematic properties of each athlete. To this end, after analyzing major kinematic variables through 3D motion analysis after Jonasson movements during the ring performance of national team players who will participate in the 2020Tokyo Olympics, the following conclusion was obtained. First, in the Jonasson movement, both arms must be open to about 1 m. Second, the extension velocities of the hip joint should be accelerated while the vertical position is high through the tap swing. In addition, the flexion velocities of hip joint should be performed quickly after the hyperextension angle is enlarged. Third, when folding and rotating the body, the higher the peak height, the narrower the width of both hands. If the height of the center of the body is relatively low during Peak and the efficiency of folding and rotating the body is reduced, the trunk can be rotated without difficulty.

오소틱 착용 시 운동역학적 변인에 미치는 영향

송주호 ( Joo Ho Song ),이순호 ( Soon Ho Lee ),백진호 ( Jin Ho Back ),박재현 ( Jae Hyeon Park ) 한국스포츠과학원 2008 체육과학연구 Vol.19 No.4

The aim of this study is to analyze the influence of the foot orthotics by measuring pressure distribution, shock absorption, EMG. The subject of the study is healthy male men at the age 30-40. I compare two cases-with wearing foot orthotics and without wearing foot orthotics when the feet are attached and detached from the surface of land. Paired t-test is applied to comparison with the two different cases with wearing foot orthotics and without wearing foot orthotics-about the measurement of pressure distribution and ground reaction force with wearing foot orthotics. I use 2×4 repeated 2way ANOVA by repeated measurement to analyze phase effects. The result of phase effect comparison shows the pressure proportion of rear inside(M6) is divided into middle(M5, M4) when the feet are attached and detached from the surface of land in wearing foot or thotics. There is no meaningful difference about ground reaction force statistically. The result of EMG about gastrocnemius, tibialis anterior, rectus femoris, biceps femoris also shows there is no specific difference with wearing foot orthotics and without wearing foot orthotics.

자연과학 : 보행 시 발 교정구 착용에 따른 운동학적 비교 연구

송주호 ( Joo Ho Song ) 한국스포츠과학원 2008 체육과학연구 Vol.19 No.3

The aim of this study is to analyze and evaluate kinematic effects about wearing foot orthotics when feet are attached on the surface of the land. The subjects of this study consist of ten healthy men and ten healthy women at the age of thirties to forties. I draw a following conclusion after analyzing. First, as for low side flection average angle of knee joint and ankle joint of the men, there are meaningful differences between wearing foot orthotics and not wearing foot orthotics. However, concerning adduction/abduction and pronation/supination, main effects of Alzner, events, event interaction between wearing foot orthotics and not wearing foot orthotics don`t show any particular differences statistically. On the other hand, men and women show meaningful differences about the main effects of each event between wearing foot orthotics and not wearing foot orthotics. They make a normal gait whether wearing foot orthotics or not wearing foot orthotics Second, relating to an Achilles and rear foot, both genders show comparatively similar angle changes. But there is no difference statistically. Wearing foot orthotics makes Achilles angle expand and makes rearfoot angle decline from attaching to detaching. That is, the range of rearfoot variable is reduced after wearing foot orthotics. In conclusion, Wearing foot orthotics improves the function of rearfoot control-prevention of excessive angle change-effectively.

기능성 신발과 일반 운동화의 운동역학적 비교분석

송주호 ( Joo Ho Song ),이종훈 ( Chong Hoon Lee ),성봉주 ( Bong Ju Sung ) 한국스포츠과학원 2008 체육과학연구 Vol.19 No.1

The purpose of the study is to examine the effect of the spring shoe through the comparison of spring shoe with normal shoe. The following conclusions was drawn through this study (the subjects of this study were 12 healthy females in the age from 20 to 30 years) in which I use force platform and Pedar pressure distribution measure to get official approval of spring shoe and normal shoe. First, there is no significant difference caused by specific shoes among groups in the second peak and first peak point. However, spring shoe receive more shock power than normal shoe because the first peak point is relatively high. Spring shoe receive less pressure related to propulsive force of the second peak point. Second, after measuring maximum pressure in each phase, I draw the conclusion there is significant difference due to the types of shoes. Generally, maximum pressure of the spring shoe is somewhat high compared to normal shoe.

스키 점프의 도약 동작과 초기 비행 동작에 관한 연구

송주호 ( Joo Ho Song ),문영진 ( Young Jin Moon ) 한국스포츠과학원 2003 체육과학연구 Vol.14 No.3

The purpose of this study was to investigate kinematic variables including flight posture and variations of technical style of ski jumping competition from take-off to early flight, and to provide quantitative data by calculating the descriptive techniques. Three skiers from the Korean National Team were recruited for the subjects. These were recorded on three Panasonic D-5100 cameras with 60fPs. The recorded cinematographic data were calculated for the control object coordinate, segment coordinate, and 2-DLT method. The smoothing of data were conducted by KWON3D(3.0) windows program(Kwon, 2001). The results of this study were as follows: 1) During the early flight, it showed that there was unable to posture minimizing horizontal drag if ankle angle is maintained over 50 degree. 2) It showed that trunk angle should keep small trunk angle from E1 to E2. Also, it appeared that movement of the neck joint should be maintained uniformly. 3) Plate V angle was increased in the shape of classic style parallel for all subjects after jumping. After 0.05 second, it flied maintaining regular angle in the shape of flat V style. 4) The reason that plate horizontal angle was excessively increased was that plate was lifted up. Therefore, it is undesirable because of drag.

평행봉 double piked 내리기 동작의 향상도 평가

송주호 ( Joo Ho Song ),백진호 ( Jin Ho Back ),박종훈 ( Jong Hoon Park ) 한국스포츠과학원 2009 체육과학연구 Vol.20 No.2

This study whose subjects are two excellent and selected players in parallel bars that is one of Korean main events is an analysis of landing movements of parallel bars double piked dropping movements through 3 dimensional image analysis. Through first technical analysis I provided feedback, through second technical analysis evaluated improvement and accomplishment of their technique. After those analyses, I drew the following conclusion. In the case of a testee S1, while flying in the air, he performed rapid vertical rise and accelerated in the left direction, so the danger to bump against the bar was eliminated. In the case of a testee S2, he got out of the bar after raising his COG (center of gravity) up, and then he performed more dynamic spin movements in the air by making his shoulder joint and hip joint curve broadly. Since up and down flying movement in the air led to decelerate left moving and horizontal moving right before landing, he could conduct composed and stable landing movements.

감정근로자 심리진단 및 힐링교육 연구

송주호 ( Joo-ho Song ),정기주 ( Ki-ju Cheong ),박남구 ( Nam-goo Park ) KNU기업경영연구소 2019 기업경영리뷰 Vol.10 No.1

The propotion of emotional labor workers is high enough to cover about 7.4 million out of 18 million workers in Korea. On the other hand, the legal system that had been lacking has been established and various supporting organizations are being organized. However, the actual support systems for solving the psychological problems that emotional labor workers face when performing their duties such as service are not enough yet. While individual studies on emotional labor and other related variables have been conducte, the educational programs are still insufficient to comprehensively diagnose the psychological conditions of emotional workers and adjust them to the psychological situations experienced by job groups and individuals in situations where they are physically and mentally challenged. This study focused on the need analysis for developing educational programs to alleviate emotional labor that has recently become a focus interest. Through the demand analysis, the main variables closely related to emotional labor were analyzed comprehensively, and the customized psychological healing educational program was put forwsr through psychological diagnosis by emotional workers.

여자 하키 페널티 코너의 드래그 플릭 슈팅 방향에 따른 동작 비교

송주호(Song Joo-Ho),김태규(Kim Tae-Gyu),김성은(Kim Sung-Eun) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.2

This study aims to present the optimal model of consistent motion and pros & cons through Kinetic analysis and provide basic data for coaching motion about difference of flick shooting motions by shooting sector based on three female elite professional hockey shooters, and the conclusion of the results is as follows. The shooting to the left direction shows a fast turnaround time in PI but the shooting to the right direction shows a fast turnaround time in P2. LB shows the shortest turnaround time in P3 and the similar turnaround time were shown in all direction in P4. The before & after speed of the Center of Mass was appeared that the movement to the goalposts direction is fast when shooting to the left direction, and the heel-toe speed was appeared that fast movement of the Center of Mass forward to the left direction in E3, but LB and RT showed the negative(-) speed, LT and RB showed the positive(+) speed in the impact phase. LT decreased speed sharply in E5. The club head and ball speed of RB was fastest. About the vertical ground reaction force, the shooting to the left direction in the E3phase showed much weight shift. In order to increase club head speed, the weight should be left to the right side for impact, and the weight shift to the left side should be performed in the follow through phase with accelerating the club head. The hip joint(right) angle of LT and RT showed small angle in E1 and E2, and the hip joint(right) angle of LB showed more stretched state in E3 than shooting motion to other direction. After that, it showed the hip joint(right) couldn’t be stretched enough for impact again. RB showed that right foot was pushed fast based on the left foot as axis.