그립압력과 중심이동이 골프 스윙에 미치는 영향

이근춘,송대찬,박종대,조장호,Lee, Kun-Chun,Song, Dae-Chan,Park, Jong-Dae,Cho, Chang-Ho 배재대학교 자연과학연구소 2003 自然科學論文集 Vol.13 No.1

골프 스윙동안 그립의 압력과 중심이동을 관측하기 위하여 실험장치를 만들었다. 측정된 그립압력과 중심이동은 안정된 프로 골퍼의 스윙자세에서 일정한 형태를 보이나 스윙이 불안한 프로의 스윙에서는 불규칙한 결과를 얻었다. Experiment setup was designed to observe the grip pressure and the center of gravity during golf swing. The experimental results of grip pressure and center of gravity during swing showed the constant type in the envelop of force intensity of a stable KPGA pro as a function of time.

골프 스윙에서 샤프트 강도 최적화

이근춘(Lee, Kun-Chun) 한남대학교 교육연구소 2015 교육연구 Vol.22 No.-

골퍼가 타수를 줄여 점수를 줄이는 방법은 유능한 코치에게서 스윙 폼을 교정을 받거나 클럽을 피팅받는 것이다. 골프게임에서 샷에 영향을 주는 인자는 비거리, 정확도, 탄도, 백스핀과 감 등 5가지이다. 이 인자를 결정짓는 것은 클럽의 라이, 로프트, 페이스 각, 소울 각, 샤프트 벤드 포인트, 페이스 프로그레션/ 호젤 옾셋, 버티칼 롤, 샤프트 플렉스, 샤프트 토크, 샤프트 무게, 중심, 길이, 샤프트 균형점, 셋 메이크업이다. 본 논문은 셋 메이크업에서 스윙 스피드에 영향을 미치는 최적의 샤프트 강도(strength)를 3차원 로봇 이미지 분석법으로 스윙을 분석하였다. 사용된 샤프트 강도는 L(ladies, 분당 진동수=215), R(regular,분당 진동수=235) and S(stiff, 분당 진동수=255)이고, 각각의 볼 스피드, 투사각, 비행시간, 낙하각, 비거리를 측정하였다. 그리고 필드에서 10명의 프로와 5명의 아마추어 골퍼로 로봇 결과를 실험하였다. 클럽 스피드 100mph 인 경우 비거리는 샤프트 강도가 센 순서로 증가하였다. 클럽 스피드가 90mph 인 경우 비거리는 샤프트 강도 R인 경우가 샤프트 강도 L 과 S 보다 양 10야드 멀리 나갔다. 로봇의 결과 확인 실험을 필드에서 비거리와 정확도를 측정한 결과는 다음과 같다. 샤프트 강도 L은 클럽 스피드 80mph에서 최대 비거리와 정확도를 보였고, 샤프트 강도 R은 클럽 스피드90mph에서 최대 비거리와 정확도를 보였으며, 샤프트 강도S는 클럽 스피드 100mph에서 최대 비거리와 정확도를 보였다. 결론적으로 골퍼의 각 개인의 클럽 스피드 와 신체 조건에 따른 최적의 샤프트 세기로 피팅하는 것이 필요하다. Real game improvement for any golfer can come one of only two ways by taking lessons from a competent teaching professional and practicing the changes that are advised, or by acquiring a custom-fit set of golf clubs that employ changes in design to overcome poor swing movements and accentuate the proper motions the golfer makes in the swing. The five shotmaking factors on the game are distance, accuracy, trajectory, backspin and feel. Their factors can be affected by a changes in the specifications of the golf club on shot performance which are lie, loft, face angle, sole angle, shaft bend point, face progression/ hosel offset, vertical roll, shaft flex, shaft torque, shaft weight, center of gravity, length, shaft balance point and set makeup. The optimum shaft strength as swing speed was studied in the set makeup through the 3-D images analysis of swing robot. The ball speed, vertical angle, flight time, landing angle and distance were measured to investigate the shaft strength of L(ladies=215), R(regular=235) and S(stiff=255) and were resulted in the followings: In case of club speed 100mph, the distance increases as shaft strength L, R and S are respectively in order. But in case of club speed 90 mph, the distance of shaft strength R is more 10 yards than the distance of shaft strength L and S. To conform the results of 3-D swing robot, the distances was measured in field by 10 pro-golfers and 5 amateur golfers using the club of shaft strength L, R and S. In case of the club of shaft strength L, the maximum distance and the directivity were obtained at the club head speed of 80mph and in case of shaft strength R, the maximum distance and the directivity were obtained at 90mph, in case of shaft strength S, the maximum distance and the directivity were obtained at 100mph. The optimum shaft strength must be applied to individual club speed differences and body conditions in club fitting.

골프볼 피팅에 관한 연구

이근춘(Lee, Kun-Chun),서아람(Suh, Ah-Ram),김선웅(Kim, Sun-Ung) 한국사회체육학회 2015 한국사회체육학회지 Vol.0 No.60

The purpose of this study was to identify the existence of the ball fitting which needs the high compression(soft) golf ball for slow speed golfers and the low compression(hard) golf balls for high speed golfers. To confirm the existence of the ball fitting we have measured the restitution of coefficient(COR) of golf balls, ball compressions measured by Atti method, the golf balls carry distances by golf robot test with Trackman III golf launch monitor. The changes of coefficient of restitution of golf ball accordance to ball temperature and ball speed have been measured. Ball temperatures were in the range of 20°C, impact speeds of ball toward to 400 pound(181kg) fixed square steel plate were 70, 85, 100, 115, 130 and 145mph. The various data of the 5 brands and 2, 3 or 2, 4 piece balls(total 50 balls) were measured at 20°C~24°C. The test results say that there is no golf ball fitting, compression is feel and cor is speed.

골프 스윙에서 D-평면과 △-평면

이근춘(Kun-Chun Lee) 한국코칭능력개발원 2004 코칭능력개발지 Vol.6 No.3

골프볼 타격 시 그립 중앙선과 드라이버 헤드 무게중심에 관한 연구

이근춘(Kun Chun Lee),서아람(Ah Ram Suh),김창국(Chang Kook Kim),김태윤(Tae Yoon Kim),김선웅(Sun Ung Kim) 한국사회체육학회 2014 한국사회체육학회지 Vol.0 No.55

The purpose of this study was to measure whether the grip cenrte lines pass through the center of gravit yof driver head at the golf ball impact moment or not. As resusl tof the high speed camera experiment(1, 000frames/sec), the data have shown that the grip center lines at ball impact pass through the back of the headcenter of gravity when measuring the from the head face. The raeson of that was because of the reboundfrom the shaft backward bending while downswing the driver with the maximum shaft bending at top.

골프 스윙에서 $\Delta$-평면과 스핀

조창호,박종대,이근춘,Jo, Chang-Ho,Park, Jong-Dae,Lee, Kun-Chun 배재대학교 자연과학연구소 2004 自然科學論文集 Vol.14 No.2

본 연구는 스윙 변수의 관찰과 스윙에 미치는 원인을 종합적으로 분석한다. 골프공은 임팩트 후에는 제어가 되지 않는다. 공은 혼자 날아가 버린다. 그러므로 임팩트 전에 제어를 해야 된다. 이 논문에서 연구의 주제는 훅과 슬라이스의 원인을 찾아보고 해결의 방법을 모색하려고 한다. $\Delta$-평면은 임팩트후의 초기속도와 스핀축의 직각 방향인 양력의 방향을 포함하는 평면으로 스윙 속도 방향벡터와 클럽면의 직각방향으로 이루어진 평면이다. 골프 스윙에 있어서 미스샷의 교정에 $\Delta$-평면을 이용하기 위하여 이론적인 고찰과 기존의 이론과의 비교 연구하여 골퍼의 스윙을 지도하여 경기력을 향상하는데 본 연구의 목적이다. The observation of the various swing parameters and its effect on golfer swing are tatally analyzed. The golf ball impact and flies away, therefore it must be controlled bofore ball impact. The purpose of this paper is that the cause of hook and slice are found and the posture of swing is corrected. The trajectory after ball impact is on the $\Delta$-plane, which is consisted of the normal vector on club face and the swing velocity vector of club head including the initial celocity and the spin axis after ball imfact. In order to correct the miss shot in golf swing, this paper is is shown that the theoretical review and study is discussed to use the D-plane and $\Delta$-plane.

골프 스윙의 어드레스와 임팩트에서 척추와 힙의 자세

조창호(Chang-Ho Cho),이근춘(Kun-Chun Lee),김건도(Gun-Do Kim) 한국코칭능력개발원 2004 코칭능력개발지 Vol.6 No.3

골프볼 온도 및 속도에 따른 볼 반발계수에 관한 연구

서아람(Ah Ram Suh),이근춘(Kun Chun Lee),김선웅(Sun Ung Kim) 한국사회체육학회 2014 한국사회체육학회지 Vol.0 No.56

The purpose of this study was to measure the change of coefficient of restitution of golf ball accordance to ball temperature and ball speed. Ball temperature was in the range of 0℃, 20℃ and 40℃, impact speeds of ball toward to 400 pound fixed square steel plate were 70, 85, 100, 115, 130 and 145mph. The data of coefficient of restitution (COR) of golf ball were measured by dividing the out-bound ball speed by inbound ball speed. In oblique impact, the COR applies only to those components of velocity along the line of impact or normal to the plane of impact. One particular type of COR test device that is commonly used in the golf ball industry is the ADC COR machine developed by Automated Design Corporation. The 5 brands and 2, 3, 4 piece balls (total 75 balls) were selected and they were fired the burst of 1,350 rounds. to the steel plate of ADC COR machine.

골프에서 최적의 스윙 동작

조창호(Chang-Ho Cho),이근춘(Kun-chun Lee) 한국코칭능력개발원 2005 코칭능력개발지 Vol.7 No.3

3주간 Selenium섭취가 항산화효소 활성과 심폐기능에 미치는 효과

양윤권(Yang Yoon-Kwon),이근춘(Lee Kun-Chun),최승욱(Choi Seoung-Wook) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.1

The purpose of this study was to examine the effect of Selenium administration for 3weeks on cardiorespiratory function and antioxidant enzyme activity in human. The subjects of this study were 10 normal healthy females and all subjects were involved in each test. The 10 female subjects randomized into two groups(Placebo, Selenium) and after Placebo(empty capsules), Selenium(water+Selenium)supplementation, the subjects performed exhaustive exercise on a treadmill. The Selenium(17.5㎍, BIOTECH, Korea) was administration for 21 days. The parameters related to the cadiorespiratory function were measured through incremental maximal exercise testing before and after each treatment. The cardiorespiratory function factor(VO2max, O2pulse, AT) was measured on the tests breathed through breathing valves using modified Bruce protocol of MetaMax 3B(Metasoft 2, U.S.A). The antioxidant enzyme activity factor(SOD, GPx and MDA) was analyzed with Cobas Mira(Roche, Switzerland) and Diode Array spectrophotometer(Hewlett Packard, U.S.A). Plasma was sampled from an antecubital vein using a hypodermic syringe at rest, post-exercise(all-out), recovery 30min after incremental maximal exercise. The result was as follows. The antioxidant enzyme activity factor(SOD, GPx) were significantly increased by Selenium but MDA were decreased. The cardiorespiratory endurance(VO2max, AT) were significantly increased by Selenium for 3weeks. In conclusion, taking Selenium before exercise may have greater effects of ergogenic aids and antioxidant supplementation than dose placebo.