• 대한물리의학회지
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• 제13권2호
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• pp.157-165
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• 2018

PURPOSE: The purpose of this study was carried out to investigate the effect of plyometric training combined with core strength training on the balance and agility of adolescent soccer players. METHODS: A total of 36 subjects participated in this study. Subjects were randomly divided 3 groups and assigned PG (plyometric training group), CSG (core strength training group) and PCG (plyometric training combined with core strength training group). Each group was assigned to 12. Intervention was performed three times a week for 4 weeks. The training was performed for 60 minutes a day. Subjects were warmed up for 10 minutes, and performed main exercise for 40 minutes. Finally, subjects performed cool-down exercise including stretching for 10 minutes. A Statistical analysis was performed the paired t-test for the comparison pre and post intervention. A comparison among the groups was using one-way ANOVA, and the LSD was used for the post-test. RESULTS: The balance and agility were statistically significant differences in all group (p<.05). There was no significant difference in the balance factors between the three groups, but there was a significant difference in the agility factor (p<.05). CONCLUSION: Plyometric training and plyometric training combined with core strength training were effective for the balance and agility of adolescent soccer players.

• Geomechanics and Engineering
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• 재33권6호
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• pp.529-542
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• 2023

Wave propagation with high transverse deflection could affect the stability of the ball in its trajectory. For low stiffness balls similar to soccer and volleyball balls, the waves are more noticeable in comparison to other balls like ping-pong ball. On the other hand, the soccer balls are under heavy impact loads from shoots and contacting different objects in the field. The maximum recorded speed of a soccer ball after kicking is the 211 km/hr and the average maximum speed is around 112 km/hr. Therefore, in such speeds the aerodynamic forces become important which are directly related to geometrical shape of the ball. In this regard, the wave propagation in soccer ball is examined in the current study using large deformation shear deformable formulations. Classical relations of stress-strain components are taken into consideration along with minimum total energy principle. The final derived relations were solved by using harmonic differential quadrature method. The results are generally presented ion term of phase velocity as function of different influencing parameters of the materials, geometry and mass of the ball.

• Journal of Sport and Applied Science
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• 제8권2호
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• pp.1-12
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• 2024

Purpose: The purpose of this study is to understand fans' perception of the MLS. Particularly, this study investigates both the avid fan's perception of the MLS as well as the same perception in a potentially larger audience. This study aims at (1) segmenting the findings into three groups, (2) understanding the characteristics of these groups from the sport marketing prospective and (3) comparing the three groups to see whether there are any similarities and differences. Research design, data, and methodology: Using motivational factors alongside the 4P's of marketing, these three segments were analyzed and their similarities and differences were compared. An online survey was created and distributed through different MLS databases. Results: Prior to the distribution, a few hypotheses were made regarding the motivational factors of fans; specifically, that the quality of play has led to a lack of interest in the league and that the presence of star athletes has the potential to bring in more fans for the league. The quality of play and star athletes are important and thus a bigger emphasis needs to be placed on the designated player rule. At the same time, more television coverage as well as more exhibition games with international teams can generate more buzz for the league and garner more fans. Conclusions: This study explored motivational factors which support fanship of Major League Soccer. Further implications were discussed.

• 대한정형외과스포츠의학회지
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• 제6권1호
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• pp.66-69
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• 2007

청소년기에 슬관절 부위에 스포츠 관련 손상은 흔하게 발생하며 이 시기에는 생리적 특성 때문에 골절이 인대손상보다 흔하다. 저자들은 청소년기의 축구 선수에서의 대퇴 외과 성장판 손상을 관절경을 이용하여 정복 및 고정을 하였다. 술 후 2년에 내고정물 제거를 동반한 이차 관절경 검사에서 관절면은 잘 치유되어 있었고, 하지 전장 방사선 촬영소견에서 하지 정열도 변형없이 잘 유지되어 있었다.

• Communications for Statistical Applications and Methods
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• 제8권2호
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• pp.557-564
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• 2001

The objective of he study is to record the real conditions along with the soccer ball that is, each player's ball keeping time, the number football keeping, accuracy of passing to other player, direction, etc., on a real-time basis, measure them in numbers and get necessary analyzed output as much as one needs. The study consists of the following stages: (1) Record the data by drawing through Visual Interface on a real-time basis; (2) Graphic windows to display the recorded data item by item in graphic; (3) Form windows to display the individual or team scores anytime when needed; (4) Windows to display the analyzed data in visualized form. The effect of the study is threefold: (1) It inputs all the game-related data on a real-time basis, which was impossible before and shows analyzed contents during the game enabling each tea manager o use; (2) In cse of TV broadcasting or newspaper articles, it explains objectively the situations of he game to the TV viewers or readers; (3) After the game, it provides importance information on each team's playing ability and individual player's technical improvement through data analysis.

• 한국콘텐츠학회논문지
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• 제16권5호
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• pp.205-216
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• 2016

본 연구는 축구 경기로 형성된 관계 네트워크 내에서 가장 영향력 있는 선수를 발굴하고 선수 개인이 팀 네트워크 내에서 얼마만큼의 정량적 역량을 지니며 팀에 기여하는지와 선수들과 포지션 상호간의 관계 네트워크가 감독의 전술에 부합하는지를 살펴보았다. 분석 결과 전반전에는 감독의 전술에 따라 공격과 수비수의 네트워크 중심성이 고르게 높은 수치를 나타내었다. 이는 각 선수들이 포지션별 역할을 충실히 수행한 것으로 판단할 수 있으며, 선수들 간의 네트워크가 유기적으로 이루어져 경기를 리드하고 선순환적인 네트워크 구조를 형성한 것을 의미한다. 반면 후반전 초반에는 전반전에 비해 특정 선수에게 지나치게 네트워크 중심이 치우치는 양상을 보이며 원활한 경기가 이루어지지 않았다. 하지만 이후 감독의 적절한 선수교체와 과감한 전술의 변화로 이러한 편향적인 구조를 벗어나 선수들 간의 네트워크 균형을 안정화 시키는 결과를 이루어냈다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제27권7호
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• pp.712-722
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• 2000

본 논문은 팀 스포츠(team sports)의 일종인 축구경기 하이라이트 장면의 자동색인을 위해 뉴럴네트워크 기법을 이용하여 그룹 포메이션(group formation) 중의 공격패턴 자동분류 기법을 개발하고 이를 검증하였다. 본 연구에서는 축구경기의 대표 프레임 상에서 선수들과 공의 위치정보를 추출하고 그룹 포메이션 정보를 기초로 뉴럴네트워크의 BP(Back-propagation) 알고리즘을 사용하여 축구경기 하이라이트 장면의 자동추출을 위한 공격패턴 자동분류 기법을 개발 및 검증하였다. 또한, 실험에는 ‘98 프랑스 월드컵 축구경기의 다양한 공격패턴에 대한 비디오 영상에서 각각 좌측공격 60개, 우측공격 74개, 중앙공격 72, 코너킥 39, 프리킥 52개의 총 297 개의 데이타를 추출하여 사용하였다. 실험결과는 좌측공격 91.7%, 우측공격 100%, 중앙공격 87.5%. 코너킥 97.4%, 프리킥 75% 로서 매우 양호한 인식율을 보였다.

• 대한정형도수물리치료학회지
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• 제29권2호
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• pp.49-57
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• 2023

Background: This study aims to investigate the effect of lower limb strengthening training combined with electro muscle stimulation on the quadriceps femoris muscle activity of soccer players. Methods: Thirty university soccer players were selected as study subjects and divided into a lower limb strengthening training group combined with EMS (Group I) and a general lower limb strengthening training group (Group II), and 15 subjects were randomly assigned. After receiving general soccer training, subjects in this study additionally mediated lower limb strengthening training combined with EMS and general lower limb strengthening training for 26 minutes, 3 times a week for 8 weeks. Quadriceps femoris muscle activity was analyzed before mediation. Vastus medialis, vastus lateralis, and rectus femoris were measured with maximum isometric contraction in the manual muscle test position in order to analyze leg muscle activity. The same items as above were re-measured and a between-group analysis was conducted after 8 weeks of mediation. Results: As a result of comparative analysis of lower extremity muscle activity between groups, the lower limb strengthening training group combined with EMS showed a statistically significant difference in lower extremity muscle activity compared to the general lower limb strengthening training group. Conclusion: As a result, it was found that lower limb strengthening training combined with EMS was more effective in improving quadriceps femoris muscle activity. Based on this study, we are going to provide basic data on the possibility of using EMS in the field of sports rehabilitation for soccer players.

• 한국게임학회 논문지
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• 제17권6호
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• pp.129-138
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• 2017

축구 시뮬레이션 게임에서 축구 선수들의 능력치를 현실에 가깝게 만드는 것은 게임의 흥미를 위해 매우 중요한 요소이다. 스포츠 시뮬레이션 게임에 경영 개념이 도입되면서 장시간 게임을 플레이하게 되면 기존 선수 캐릭터의 은퇴문제가 발생하고 새로운 선수 캐릭터를 생성하여 게임의 환경을 유지하게 된다. 본 연구에서는 새로운 선수 캐릭터를 생성할 때 유전 알고리즘을 활용하여 기존의 선수와 유사하면서 최적의 능력을 갖추게 하는 방식을 제안한다. 기존의 랜덤 생성방식, 보정 랜덤방식과 제안한 알고리즘으로 선수 캐릭터를 생성하여 비교, 평가하여 제안한 방식의 유효성을 검증한다.

• 한국산학기술학회논문지
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• 제16권8호
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• pp.5296-5303
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• 2015

본 연구의 목적은 플렉시-바 운동이 유소년 축구선수의 자세와 균형 변화에 미치는 효과를 알아보고자 실시하였다. 연구대상은 10대 유소년 축구선수로 운동군 10명, 대조군 10명으로 나누어 운동군에 플렉시-바 운동을 8주간 주3회 일일 30분 실시하여 연구대상자들의 운동 전 후와 연구군 사이의 자세정렬과 균형의 차이를 분석하였다. 연구전 측정 시 연구대상자들은 전반적인 자세정렬의 비대칭과 균형이 오른쪽과 뒤쪽으로 치우친 특징을 보였다. 연구결과, 운동군은 양쪽 어깨, 어깨뼈, 골반, 손의 각도와 높낮이 차이(p<.05)가 통계적으로 유의하게 개선되었지만, 대조군에서는 유의한 변화가 없었다. 균형의 변화는 운동군에서 눈을 뜬 상태의 이동거리가 통계적으로 유의하게 감소하였다(p<.05). 본 연구를 통해 플렉시-바 운동이 유소년 축구선수의 자세와 균형 개선에 효과적인 운동프로그램이 될 수 있음을 확인하였다.