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      • KCI등재

        아마추어 골퍼의 홀별 성적을 이용한 라운드 스코어 예측

        천영진(Young Jin Chun) 한국자료분석학회 2021 Journal of the Korean Data Analysis Society Vol.23 No.3

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        본 연구는 아마추어 골퍼를 대상으로 버디, 파, 보기, 더블보기, 트리플보기, 쿼드러플보기 등의 홀별 성적을 이용하여 라운드의 스코어를 예측하고자 하였다. 이를 위하여 인터넷 포털사이트에서 ‘골프 스코어 카드’를 키워드로 이미지를 검색하여 1113개의 홀별 성적을 엑셀 프로그램에 직접 입력하였다. 각 라운드에서 홀별 성적에 대한 회수를 산출하여 회귀분석을 실시한 결과 다음과 같은 결론을 얻었다. 아마추어 골퍼의 평균타수는 90타로, 싱글 골퍼는 파를 9개 이상, 80대 타수는 파를 5개 이상, 90대 타수는 파를 3개 이상 기록해야 한다. 또한, 초급 수준에서는 100타를 깨기 위해서는 트리플보기를 3개 이하로 해야 하고, 108타 이상의 스코어에서는 쿼드러플보기가 2개 이상 기록한 것으로 나타나 미스 샷을 줄이는 데에 초점을 맞추어야 한다. 라운드스코어의 설명력이 가장 높은 홀별 성적은 파로서 103-2.5×(파 개수)로 스코어를 예측할 수 있고, 다중회귀분석결과 보기를 제외한 모든 변인이 채택되었으며 설명력은 98.5%로 나타났다. 추후연구에서는 홀별 성적 외에 그린 적중률, 퍼팅 수, 리커버리율 등의 자료를 확보할 수 있는 방안을 찾아 적용한다면, 아마추어 골퍼의 실력 향상에 도움이 될 것으로 사료된다. This study attempted to predict the score of the round by using the performance of each hole such as buddy, par, bogie, double bogie, triple bogie, and quadruple bogie targeting amateur golfers. To this end, the G, N, and D portal sites searched for images with the keyword ‘golf score , and 1113 scores for each hole were entered into the Excel program. As a result of regression analysis by calculating the number of times for each hole performance in each round, the following conclusions were obtained. The average score for amateur golfers is 90, and a single golfer has to score 9 or more pars, 5 or more pars for 80s, and 3 or more pars for 90s. In addition, at the beginner level, three or less triple bogies are required to break 100 strokes, and two or more quadruple bogeys at a score of 108 or higher should focus on reducing miss shots. The score for each hole with the highest explanatory power of the round score was a par, which could predict the score as 103-2.5×(number of par), and all variables were adopted except bogey the results of multiple regression analysis, and the explanatory power was 98.5%. In a future study, it is believed that it will help amateur golfers to improve their skills if they find and apply a method to secure data such as green hit rate, number of putts, and recovery rate in addition to the performance of each hole.

      • KCI등재

        랠리포인트제에서 여자 프로배구 득점 내용 및 추이 분석

        천영진(Chun Young-Jin),김규태(Kim Kyu-Tae) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.2

        The purpose of this study is to analyze problems of rally point scoring system and gains and losses of set according to the serve by set score ratio every game score process and change during set is arranged in female professional volleyball games. For this, it is intended for 76 games, 303 sets which were combined with 70 games of regular season and each three games of Playoff and Championship by female professional 5 teams that participated in 2008-2009 Season V-League held from Nov. 22nd, 2008 to Apr. 11th, 2009. Set score ratio and victory probability according to score margin were calculated by percentage and the chi-squared test was conducted to verify gaps between the first score of team with the serve and outcome of it. Conclusion based on these results is as follow: First, the effort to win the 1st set is required as the probability that female teams will win in the games after winning it is 70%. Second, the effort to obtain 20 points earlier is required as the probability that teams will games if they do them earlier is 88.9%. Third, the game result can be somewhat expected when there are 20 points as the ratio that teams win come-from-behind victories after them when audience watch games is 10%. Forth, the first scores of the serve teams have nothing to do with the results of the games. When the above contents are synthesized, the games are dynamic because they are fast processed in the current rally point scoring system. But there is an disadvantage that the results of the game can be somewhat expected because there are no the real charms that turns the tide in the game in the second half of the sets. Therefore, tension should not be reduced in the second half of the games by mixing the rally point scoring system with the side out system.

      • KCI등재

        야구 영상분석을 통한 외야수의 송구 정확도 평가 및 득점 가능성 분석

        천영진(Chun, Young-Jin) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.5

        This study intended to analyze the probability of bringing second base runner home by a base hit in a professional baseball game and evaluate outfielders" capabilities of throwing ball to home base. For this purpose, this study analyzed 277 hits which occurred during the KBO regular season games between April 2 and May 31, 2013 at the respective situations of base runners being on second base, first and second base, second and third base, and full bases. The conclusion of the analysis is summarized as follows: First, if it is two out situation, a base hit has higher probability of bringing second base runner home since second base runner shall start earlier regardless of direction of the ball hit by a batter. Second, the sum of the time elapsed for outfielders to get the ball hit by batters and the time elapsed for the balls thrown by outfielders to reach home equaled to the time elapsed for second runners to reach home, and therefore the probability for second base runner to score run is higher than not because additional time for catchers to tag runner is necessary. Third, the probability of second base runners" scoring was higher in the cases where the time elapsed until outfielder caught the hit ball was not less than 3.5 seconds, outfielders caught hit balls after second base runners reached third base, and the difference between the time elapsed for outfielders to catch hit balls and the time elapsed for second base runners to reach third base was less than 0.4 seconds. Lastly, it was found that catchers had tendency to catch outfielders" thrown balls at particular areas depending upon individual catchers, and it was also found that outfielders had to throw balls home in the way that catchers could catch the thrown balls on the right handed batter"s plate along the third base line in order to get the runner out of the game.

      • KCI등재

        대학야구에서 알루미늄 배트와 나무 배트 사용 시 경기력 비교

        천영진(Chun, Young-Jin),김규태(Kim, Kyu-Tae) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.4

        The purpose of this study was to compare result of game between aluminum bat and wood bats in baseball games. The data of this study were records of the aluminum bat 1999 it uses and the wood bat it uses 2000, 2001 from collegiate baseball games. The variables of this study were runs, singles, doubles, triples, home runs, slugging percentage, opponents batting average, batters faced, innings pitched per team, and time per game from, 1999, 2000, 2001 seasons. Statistical analysis of this study was one way ANOVA. The conclusions are the following: 1. The run per team of the year which is used in aluminum bat was higher than that used in wood bat. 2. Except of triple, the hits per team of the year which is used in aluminum bat were more than that used in wood bat. 3. The slugging percentage and opponents batting average per team of the year which is used in aluminum bat were higher than that used in wood bat. 4. The innings pitched and batters faced per team of the year which is used in aluminum bat were higher than that used in wood bat. 5. The time per game of the year which is used in aluminum bat was longer than that used in wood bat.

      • KCI등재

        야구 던지기 동작에서 공 속도 차이에 따른 지면반력 비교 분석

        천영진(Chun, Young-Jin) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.5

        The purpose of this study was to investigate the difference in ground reaction forces according to different ball speeds during baseball pitching. Five unexperienced baseball players before participating before and after baseball class were selected as subjects for this study and the ground reaction forces were measured separately for the right and left foot. First, the higher the ball speed, the higher the left foot’s vertical ground reaction force. This shows how the subjects push off with their left foot to increase ball speed. Second, the higher the ball speed, the higher the antereoposterior ground reaction force showing the transfer of the push off from the right foot. Third, the higher the ball speed the later the tendency for the subject to release it after the push off. Future research should consider the subject"s center of gravity, center of pressure range of movement and the analysis should include the follow through phase after the release.

      • KCI등재

        보행 시 지지면 급변에 따른 연령별 운동학적 반응 형태 비교

        천영진 ( Young Jin Chun ),신인식 ( In Sik Shin ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.3

        The purpose of this study was to analyze the difference in reaction patterns during the support phase after perturbation in gait according to different age. A total of 12 subjects participated; 5 elderly and 7 adults(control), to investigate the differences between normal and perturbed gait. The step length didn`t change during normal and perturbed gait but was longer in the control group. There was no difference in the step width. When the right foot was perturbed, the control group`s left foot speed was faster than the elderly group`s which was to maintain stability. The elderly flexed both right and left knees more than the control group. After the perturbation, the elderly group had a larger trunk anterior flexion. With the larger flexion of both legs of the elderly group it shows that the lack of knee flexion strength is a factor, that could cause falling and so a prevention program should focus on strengthening the quadriceps. With the excessive trunk flexion after the perturbation by the elderly group observed, it is suggested that while walking everyday a good routine of walking with an upright posture should be developed.

      • KCI등재

        지지면 급변에 따른 연령별 보행 변인 비교

        천영진(Chun Young-Jin) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.2

        This study's purpose is to examine the age-related difference in variables of gait from the perturbation during gait. In order to perform this task, a trap was installed on 7 meter-long, 1.5 meter-wide path with its base-of-support rapidly changed, on which seven subjects in their twenties, forties and seventies respectively were requested to tread and go through. Subjects were n .. 'quested to perform normal gaits and confounding gaits five times respectively in random order. The gait was analyzed using 6 infrared cameras. Kinematic variables of speed, step time, step length, step width, etc. were assessed for gait analysis. Followings are the remarkable results obtained from this study. First, as aging was in progress, velocity got slower and step time got longer. In comparison of the section with perturbation with the other, there was no difference in their twenties, but longer step time in their forties and seventies. Second, as aging was in progress, step length tended to get shorter. When perturbation occurred, they shortened the step length to keep balance in their twenties, while extended the step time instead of step length in their forties and seventies. Third, there was no difference in step width depending on the ages, but a strong possibility that balance can be lost because of reduced step width when perturbation occurred in their seventies. Fourth, when detected from left knee, as aging was in progress reaction time got slower. Fifth, as aging was in progress, onset time appeared late at tibialis anterior and gastrocnemius only.

      • KCI등재

        대학 야구 강의를 통한 초보자의 타격 동작 변화 분석

        천영진 ( Young Jin Chun ) 한국운동역학회 2012 한국운동역학회지 Vol.22 No.3

        The purpose of this study is to find out the changes in beginners` batting movements after taking undergraduate baseball lectures, by comparing and analyzing the speed of bat, the angle of body and its segments, the angular velocity and so on. For this purpose, the author picked up five undergraduates who had not taken baseball lectures, and conducted three-dimension computerized tomography twice on them, that is, before and after taking baseball classes, with eight infrared cameras and two force platforms. The conclusions are, first, the time required for swing was shortened after taking the classes. Second, the maximum velocity of the bat-end was increased. Third, at the time of impact, while the rotation angles of the pelvis and the tip of left foot were increased, the left elbow had more flexion after the classes. Fourth, the size of ground reaction force was increased at the point of swing where the ground reaction force of left foot became maximized. As we can infer from these conclusions, beginners` hitting movements before taking baseball classes tended to swing only with the arms, without waist rotation and weight shift of the lower body, but after the classes, their movements were proved to be corrected into the swing using the lower body. For the future studies, the author expects a research in a close to real environment by using pitching machine.

      • KCI등재

        남자 프로 배구 경기에서 팀별 연속 득점 유형 분석

        천영진(Chun, Young-Jin) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.3

        This research of men`s professional volleyball term was aimed to look at the analysis of the frequency, types and the time of occurrence of continuous scoring and their relation to gaining and losing of points, each team`s characteristics and the rankings. In order to gain the analysis, out of 105 games, 5 sets were put aside and total of 379 remaining sets were targeted from the 7 professional teams participating in the V-League of the 2013-2014 regular season. From the gatherings, the following conclusion was made. Firstly, after performing the logistic regression analysis on various types of continuous scoring with its effect on the gain and the loss of points, every variable had a power of explanation. Secondly, when it comes to the frequency, continuous scoring was the most frequent at team`s mistakes and blocking; based on the result, the team needs to focus on reducing mistakes and strengthening of blocking. Lastly, in regards to the time of occurrence, each team had distinctive results in the second half of the game; concentration is very essential on top of anything else until the end of the game. After putting all the above information together, acquiring points through a serve ace is ideal, however, inducement of a simple offense by making the opponent`s receive more difficult is the best method; reducing mistakes and strengthening of blocking which can lead to blocking score or valid blocking then scoring by digging is necessary.

      • KCI등재

        15주 야구 수업을 통한 던지기 동작의 운동학적 변인 변화 분석

        천영진 ( Young Jin Chun ),신인식 ( In Sik Shin ) 한국운동역학회 2012 한국운동역학회지 Vol.22 No.1

        The purpose of this study was to investigate the pattern change of throwing in baseball after 15 weeks of participation in baseball class, by examining ball speed, trunk and upper body angles. The comparison was with 6 university students that haven`t had any experience in baseball. 8 infra red cameras and 2 force platforms were used to collect the data. First, there was an increase in the speed of the ball after the class. Second, there was no significant difference in the allocated phases during the throw before and after class. Third, the release point was lower and more in front. Forth, there was an increase in the knee flexion at the left foot landing and release point. Finally, there was an increase in the maximum shoulder external rotation and pelvis angle. It is recommended that the coordination between the segments should be investigated to improve our understanding of the learning of throwing in future research.

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