• Advances in concrete construction
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• 제16권4호
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• pp.189-203
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• 2023

This study investigates the bending and stability properties of cylindrical constructions, with a focus on their use in the design and implementation of sporting equipment. The work focuses on a cylindrical construction resembling nanomotors, similar to components seen in sports equipment, using mathematical modeling based on high-order beam theory and nonlocal strain gradient theory. The analysis provides important insights into the dynamic behavior of these systems, revealing light on the impact of numerous factors such as rotational velocity, section change rate, and structural dimensions. The results show a relationship between angular velocity growth and section change rate, which leads to an increase in fundamental frequency values. Furthermore, the research emphasizes the effect of structural factors on dynamic deflection, giving critical information for increasing the stability and performance of sporting equipment. This study adds to the area of sports engineering by providing a more nuanced understanding of how cylindrical constructions react under diverse settings. The results will help to guide the design and manufacturing processes of sports equipment, assuring improved stability and performance for players across a wide range of sports.

• 운동영양학회지
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• 제25권1호
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• pp.7-15
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• 2021

[Purpose] Sodium bicarbonate shows ergogenic potential in physical exercise and sports activities, although there is no strong evidence which performance markers show the greatest benefit from this supplement. This study evaluated the effects of sodium bicarbonate supplementation on time trial performance and time to exhaustion in athletes and sports practitioners. [Methods] A systematic review was conducted using three databases, including 17 clinical trials. Among these clinical trials, 11 were considered eligible for the meta-analysis according to the criteria for the assessment of methodological quality using the PEDro Scale. Time to exhaustion was assessed in six studies, while time trial performance was evaluated in five studies. [Results] A significant beneficial effect of supplementation on time to exhaustion was found in a random effects model (1.48; 95% confidence interval [CI], 0.49 to 2.48). There was no significant effect of supplementation on time trial performance in a fixed effects model (slope = -0.75; 95% CI, -2.04 to 0.55) relative to a placebo group. [Conclusion] Sodium bicarbonate has the potential to improve sports performance in general, especially in terms of time to exhaustion.

• 동아시아경상학회지
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• 제10권3호
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• pp.115-125
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• 2022

Purpose - Sports leadership is frequently used as a useful comparison for understanding traits like teamwork and motivation in the business world. Based on the results of numerous studies, this research provides a critical assessment of the current state of knowledge in sport leadership research using methodological advances from other disciplines such as business and economics Research design, Data, and methodology - This research selected the systematic review analysis as its research design. The review analysis is a minimal set of elements for reporting in reviews by evidence. The present author included numerical data with confidence ranges for the most crucial outcomes if the review contained meta-analyses. Result - According to a study in sports, transformational leadership has a positive effect on company success. Communication and commitment, two possible mediators, may strengthen the impact of transformational leadership on cohesiveness. Prior researchers found that intrinsic drive serves as a bridge between transformational leadership and performance. Conclusion - This research concludes that the articles used for data analysis in this study examined the value of sports leadership for business leaders in a number of sports, including athletics and handball, among others. There is a good chance that different sports will provide different insights on the value of sports leadership for CEOs.

• Geomechanics and Engineering
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• 제32권5호
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• pp.463-474
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• 2023

Materials produced with the help of new technology are used in the design of materials used in all science and engineering departments today. A sports engineering and sports equipment department is one of these departments. The use of nanotechnology in sports equipment is one of the most popular uses of this technology today. Nanomaterials have been used in sports equipment for many years, and reputable companies have benefited. Athletes' equipment allows them to display their skills to the fullest extent. It has always been a dream of professional athletes and their coaches to have unique equipment. As a result, engineers have spent all their time and effort solving this problem. Science and engineering can do various things to meet the needs of all sports levels, including specific and detailed designs, the use of appropriate materials, and standardization tests on equipment. However, these aspects must remain aligned with the latest technologies as they develop, just as with other sciences. These technologies, especially nanotechnology, are essential to sports equipment and devices developed today by sports engineers. This article examines the balls that use nanotechnology and can also improve the athlete's performance by using this technology in a specific structure. Using nanotechnology to make nanocomposite poly-hope balls, which makes them lighter and more acceptable, reduces the impact on the ball and increases its movement speed.

• 한국체육학회지인문사회과학편
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• 제54권3호
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• pp.31-43
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• 2015

본 연구는 댄스스포츠선수의 경기력 저해요인과 결정요인을 분석하였다. 구체적으로 개방형 질문을 통해 경기력 저해요인과 결정요인을 구성하는 내용을 규명하였으며, 저해요인을 고려해서 경기력 결정요인의 구조를 확인한 다음 도출된 개념적 구조에 대한 타당성을 검증하였다. 이를 위해 25명의 댄스스포츠전문가 집단에게 개방형 질문을 실시하여 귀납적 내용분석 절차를 통해 저해요인과 결정요인을 분석한 후, 결정요인을 구조화하기 위해 1차 조사 100명과 2차 조사 137명의 댄스스포츠선수를 대상으로 탐색적 요인분석과 확인적 요인분석을 통해 댄스스포츠 경기력 결정요인을 도출하였다. 자료 분석 결과를 토대로 얻어진 본 연구의 결론은 다음과 같다. 첫째, 경기력을 저해하는 요인으로는 파트너와의 불협화음, 컨디션, 대회 환경, 체력의 한계, 경제력의 한계이다. 둘째, 댄스스포츠선수들의 경기력 향상을 위한 결정요인으로는 1차 조사에서는 8개의 하위요인의 26개 구성문항을 확인하였고, 2차 조사에서는 7개의 하위요인의 26개 구성문항으로 분석되었고, 확인적 요인분석에서 3개 문항이 삭제되면서, 최종적으로 댄스스포츠선수의 경기력 결정요인은 「파트너십」 5문항, 「투자능력」 2문항, 「정신적인 요인」 2문항, 「트레이닝 요인」 3문항, 「신체적인 요인」 3문항, 「지도자의 능력」 3문항, 「대회의 환경」 5문항으로 총 7개의 요인과 23문항이 최종 확정되었다.

• 한국응용과학기술학회지
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• 제37권5호
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• pp.1314-1322
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• 2020

Sports drinks help optimize and improve performance by delaying and eliminating the buildup of fatigue-causing substances in the body during exercise. Saengmaeg-san is a nature-friendly traditional beverage that has no side effects on the human body and can quench thirst. However, studies on the relationship between exercise ability and Saengmaeg-san are insufficient. The purpose of this study was to prescribe Saengmaeg-san during the summer training period of 4 weeks and to analyze the effect on body composition and exercise performance. Seventeen male participants were divided into 3 groups (Saengmaeg-san acid intake group [n=9], placebo group [n=8]), and body composition (height, weight, muscle mass, fat mass, BMI) and conducted exercise performance (total exercise time and HRmax). In our study, Saengmaeg-san intake had a positive effect on exercise performance, such as decreased body fat percentage, increased exercise time, and decreased HRmax. Therefore, Saengmaeg-san showed the potential as a sports drink. In the future, additional studies on fatigue-related substances, immune function-markers, and blood lipids are needed in order to clearly explain the change in exercise performance due to consumption of Saengmaeg-san.

• International Journal of Computer Science & Network Security
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• 제22권10호
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• pp.246-256
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• 2022

Recently, parents and teachers consider physical education as a minor subject for students in elementary and secondary schools. Physical education performance has become increasingly significant as parents and schools pay more attention to physical schooling. The sports mining with distribution analysis model considers different factors, including the games, comments, conversations, and connection made on numerous sports interests. Using different machine learning/deep learning approach, children's athletic and academic interests can be tracked over the course of their academic lives. There have been a number of studies that have focused on predicting the success of students in higher education. Sports interest prediction research at the secondary level is uncommon, but the secondary level is often used as a benchmark to describe students' educational development at higher levels. An Automated Student Interest Prediction on Sports Mining using DL Based Bi-directional Long Short-Term Memory model (BiLSTM) is presented in this article. Pre-processing of data, interest classification, and parameter tweaking are all the essential operations of the proposed model. Initially, data augmentation is used to expand the dataset's size. Secondly, a BiLSTM model is used to predict and classify user interests. Adagrad optimizer is employed for hyperparameter optimization. In order to test the model's performance, a dataset is used and the results are analysed using precision, recall, accuracy and F-measure. The proposed model achieved 95% accuracy on 400^th instances, where the existing techniques achieved 93.20% accuracy for the same. The proposed model achieved 95% of accuracy and precision for 60%-40% data, where the existing models achieved 93% for accuracy and precision.

• Steel and Composite Structures
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• 제50권4호
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• pp.459-474
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• 2024

Classical and first-order nonlocal beam theory are employed in this study to assess the thermal buckling performance of a small-scale conical, cylindrical beam. The beam is constructed from functionally graded (FG) porosity-dependent material and operates under the thermal conditions of the environment. Imperfections within the non-uniform beam vary along both the radius and length direction, with continuous changes in thickness throughout its length. The resulting structure is functionally graded in both radial and axial directions, forming a bi-directional configuration. Utilizing the energy method, governing equations are derived to analyze the thermal stability and buckling characteristics of a nanobeam across different beam theories. Subsequently, the extracted partial differential equations (PDE) are numerically solved using the generalized differential quadratic method (GDQM), providing a comprehensive exploration of the thermal behavior of the system. The detailed discussion of the produced results is based on various applied effective parameters, with a focus on the potential application of nanotubes in enhancing sports bikes performance.

• 대한치과의사협회지
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• 제53권9호
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• pp.602-609
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• 2015

The aim of this document is to evaluate the effect of bite balance on physical fitness and motor capacity to determine the importance of the occlusal stability as a possible action mechanism of occlusal appliance including mouthguards on physical performances. We all remember that day when the prominent athlete was in the news wearing a mouthguard to improve human athletic performance. I once had investigated the determinants of athletic performance in all sorts of sports. Most of the studies had overinterpretation of results and lack of evidence to support the information. However, I discovered great expectations for new possibility in this field and settled for a more academic approach to this intriguing subject. The followings are some examples of the subject 1. Archers who wore occlusal appliances to increase the vertical dimension of occlusion by 2~3mm increased their ability to focus and to maintain good sense of balance. Their accuracy rate has been improved. The appliance was made of acrylic resin (a type of plastic). 2. Canoe players who wore occlusal appliances to increase the vertical dimension of occlusion by 5mm surpassed longtime competitor and won the race with 10 seconds gap. 3. A cycle rider who wore an occlusal appliance to treat his malocclusion surpassed his old record from 10.8 seconds to 10.3 seconds. His muscle reflexes (anaerobic exercise) and endurance (aerobic exercise) has been enhanced. 4. Occlusal appliances had a good effect on athletic performance in most sports such as swimming, diving, and weightlifting. As for the clenching on dentition, people clench their teeth when they push their physical and mental limits during sports activities. Clenching can be induced by physical exertion when maximum muscle strength is retained and this is similarly found in different types of exercises. In addition, restraint of respiratory function is observed. Therefore, creating a occlusal balance with occlusal appliance or mouthguard promoted a favorable influence when an athlete clenches.

• 한국엔터테인먼트산업학회논문지
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• 제13권4호
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• pp.195-206
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• 2019

이 연구는 국내 스포츠계열 대학생들이 인식하는 핵심역량에 대한 중요도와 실행도를 분석하여 향후 미래사회가 요구하는 방향으로 스포츠계열 학생들의 역량을 강화시킬 수 있는 방향과 방법을 도출하는데 그 목적이 있다. 309명의 스포츠계열 전공 대학생들을 대상으로 분석한 결과는 다음과 같다. 첫째, 스포츠계열 대학생들이 인식하는 핵심역량의 중요도에서는 자기관리역량, 대인관계역량, 의사 소통능력, 종합적 사고력, 자원정보 기술 활용역량, 글로벌 역량의 순으로 나타났다. 둘째, 스포츠계열 대학생들이 평가하는 자신들의 핵심역량 보유 실행도는 대인관계역량, 자기관리역량, 의사소통능력, 종합적 사고력, 글로벌 역량, 자원정보 기술 활용역량의 순으로 나타났다. 셋째, 핵심역량의 중요도와 실행도의 차이는 모든 영역에서 유의한 차이가 있는 것으로 나타났고, 차이가 큰 영역은 종합적 사고력, 의사소통능력, 자원정보 기술 활용역량, 자기관리역량, 글로벌 역량, 대인관계역량의 순으로 나타났다. 스포츠계열 대학생들은 대인관계역량과 자기관리역량, 의사소통능력은 상대적으로 높이 평가한 반면 종합적 사고력, 자원정보 기술 활용역량, 글로벌 역량은 취약한 것으로 나타나, 이를 보완할 수 있는 교육과정의 변화를 통해 미래 사회가 요구하는 인재로 거듭날 수 있을 것이다. 따라서 대학은 교육과정의 혁신과 교수자의 역량 강화를 통해 경쟁력 있는 스포츠계열 인재를 양성하는 것이 필요하며, 이것이 곧 대학의 경쟁력 제고와 연결될 수 있음을 인식해야 한다.