• Title/Summary/Keyword: sport monitoring

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Nonlinear free vibration impact on the smart small-scale thermo-mechanical sensors for monitoring the information in sports application

  • Yi Zhang;Maryam Bagheri
    • Steel and Composite Structures
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    • v.50 no.6
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    • pp.609-625
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    • 2024
  • This paper presents an in-depth analysis of the nonlinear vibration of microbeams, with a particular emphasis on their application in sports monitoring systems. The research utilizes classical beam theory, modified couple stress theory, and von-Kármán nonlinear parameters to explore the behavior of microbeams. These microbeams are characterized by a non-uniform geometry, with materials that continuously change along the beam radius and a thickness that varies along the beam length. The main contribution lies in its exploration of the stability of smart sensors in sports structures, particularly those with non-uniform geometries. The research findings indicate that these non-uniform microbeams, when used in smart systems made of functionally graded temperature-dependent materials, can operate effectively in thermal environments. The smart system developed in this study demonstrates significant potential for use in sports applications, particularly in monitoring and gathering information. The insights gained from this research contribute to the understanding of the performance and optimization of microbeams in sports applications, particularly in the context of non-uniform geometries. This research, therefore, provides a foundation for the development of advanced, reliable, and efficient monitoring systems in sports applications.

Evaluation of Gait Stability using Medio-Lateral Inclination Angle in Male Adults (좌·우 기울기각도를 이용한 남자 성인의 보행안정성 평가)

  • Chang, Jae-Kwan;Yoon, Suk-Hoon
    • Korean Journal of Applied Biomechanics
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    • v.20 no.3
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    • pp.261-266
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    • 2010
  • Human body is hard to be in perfect balance during walking. Most of time the trunk is supported by one leg and the center of mass(COM) falls to the contralateral side. Thus, dynamic variables such as the velocity of the COM should be considered when gait stability is evaluated. The purpose of this study was to investigate whether the extrapolated center of mass(XCom) which utilized the COM position and its velocity, is appropriate to evaluate gait stability. Ten healthy adults participated in this study and performed 3 different types of gaits(normal(NG), hands on waists(HWG), and hands on shoulders(HSG)) onto 4 different types of obstacle(obstacle height: 0%, 30%, 40% and 50% of leg length). Medio-lateral Com-CoP and XCom-CoP inclination angle were calculated during support phase. For all condition, greater M-L XCoM-CoP inclination angles were found(p<.05) compared with those of matched obstacle height CoM-CoP. Especially, M-L XCoM-CoP inclination angle at 50% height revealed the best condition for monitoring dynamic stability. Significantly increased in M-L XCoM-CoP inclination angle was found(p<.05) as obstacle height increased on NG and HWG.

Improving hydration in elite male footballers during a national team training camp - an observational case study

  • Mohr, Magni;Nolsoe, Eli Leifsson;Krustrup, Peter;Fatouros, Ioannis G.;Jamurtas, Athanasios Z.
    • Korean Journal of Exercise Nutrition
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    • v.25 no.4
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    • pp.10-16
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    • 2021
  • [Purpose] The purpose of this study was to (i) assess hydration levels in elite male football players during a national team training camp before and during qualifying matches, (ii) evaluate the effect of coaching strategies for hydration based on feedback from hydration monitoring, and (iii) assess possible relationships between hydration status and training load or wellness markers. [Methods] Thirty-one male players (age 27±4 yrs; height 185±6 cm; weight 82.9±6.7 kg; body fat 10.4±2.3%) representing a national team from the Union of European Football Associations (UEFA) participated. The players were studied during three different national team training camps related to the UEFA Nations League tournament. Urine specific gravity (USG) was measured to assess hydration status. During all camps, the players were actively coached on improving strategies for hydration and given individual feedback on their test results. The training load was measured using GPS technology, and wellness questionnaires were completed. [Results] USG decreased progressively and significantly (p<0.005) during camp 1 and hydration status improved over the three camps, with fewer dehydrated and more well-hydrated players identified during the last part of camp 3. Significantly (p<0.05) higher USG values were observed 2 days prior to a match (MD-2) than on match day (MD); consequently, 52% of the players were dehydrated on MD-2 and only 6% on MD. No correlations were observed between hydration status and training load or wellness markers. [Conclusion] Dehydration is a challenge in elite male football, but continuous monitoring of hydration status and coaching on hydration strategies can lead to major improvements and reduce the degree of dehydration.

A Study on Real-Time Sports Activity Classification & Monitoring Using a Tri-axial Accelerometer (가속도 센서를 이용한 실시간 스포츠 동작 분류.모니터링에 관한 연구)

  • Kang, Dong-Won;Choi, Jin-Seung;Tack, Gye-Rae
    • Korean Journal of Applied Biomechanics
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    • v.18 no.2
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    • pp.59-64
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    • 2008
  • D. W. KANG, J. S. CHOI, and G. R. TACK, A Study on Real-Time Sports Activity Classification & Monitoring Using a Tri-axial Accelerometer. Korean Jouranl of Sport Biomechanics, Vol. 18, No. 2, pp. 59-64, 2008. This study was conducted to study the real-time sports activity classification and monitoring using single waist mounted tri-axial accelerometer. This monitoring system detects events of sports activities such as walking, running, cycling, transitions between movements, resting and emergency event of falls. Accelerometer module was developed small and easily attachable on waist using wireless communication system which does not constrain sports activities. The sensor signal was transferred to PC and each movement pattern was classified using the developed algorithm in real-time environment. To evaluate proposed algorithm, experiment was performed with several sports activities such as walking, running, cycling movement for 100sec each and falls, transition movements(sit to stand, lie to stand, stand to sit, lie to sit, stand to lie and sit to lie) for 20 times each with 5 healthy subjects. The results showed that successful detection rate of the system for all activities was 95.4%. In this study, through sports activity monitoring. it was possible to classify accurate sports activities and to notify emergency event such as falls. For further study, the accurate energy consumption algorithm for each sports activity is under development.

Development of a curling pad performance test system to support Korea curling team (국가대표 컬링 대표팀 지원을 위한 컬링 패드 성능 시험 시스템 개발)

  • Kim, Taewhan;Lee, Sangcheol;Kil, Sekee
    • Journal of the Korea Convergence Society
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    • v.11 no.10
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    • pp.25-30
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    • 2020
  • In this study, a test system which can test performance of curling pad was developed to support Korea curling team. The developed system consists of a water tank, a mechanical pad driving system that can perform sweeping movement using a curling pad on surface of ice made by the water tank, and temperature sensors monitoring ice and air temperatures. To control the temperature of ice and humidity/temperature of air around the ice, all system are installed in a chamber that can isolate the developed system from external environment. Eight kinds of curling pads were tested using the developed system. Test result showed that each curling pad revealed different rate of ice temperature increasing. The pad with the highest rate of ice temperature rising was found to be the same as the most preferred pad by the athletes. Therefore, it was confirmed that the method of measuring change of ice temperature by the sweeping performed in this study is an effective method to test the performance of the pad.

Development of Putting Grip Sensor System (퍼팅그립 악력 측정시스템의 개발에 관한 연구)

  • Tack, Gye-Rae;Lim, Young-Tae;Yoon, Jeong-Min;Kim, Hyung-Sik;Yi, Jeong-Han
    • Korean Journal of Applied Biomechanics
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    • v.15 no.2
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    • pp.113-117
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    • 2005
  • As a preliminary study of finding the relationship between the force at the grip and the success rate during putting stroke, the putting grip sensor system using FSR sensors was developed. The system consisted of the hardware which had the sensor part with 8 sensors per putting glove and data acquisition part as well as the software which had the real-time monitoring program and the offline post-processing program. After experiments with elite-golfer using this system, it is possible to suggest the proper force ranges at the grip during putting stroke.

Structural health monitoring of innovative civil engineering structures in Mainland China

  • Li, Hong-Nan;Li, Dong-Sheng;Ren, Liang;Yi, Ting-Hua;Jia, Zi-Guang;LI, Kun-Peng
    • Structural Monitoring and Maintenance
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    • v.3 no.1
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    • pp.1-32
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    • 2016
  • This paper describes the backgrounds, motivations and recent history of structural health monitoring (SHM) developments to various types of engineering structures. Extensive applications of SHM technologies in bridges, high-rise buildings, sport avenues, offshore platforms, underground structures, dams, etc. in mainland China are summarily categorized and listed in tables. Sensors used in implementations, their deployment, damage identification strategies if applicable, preliminary monitoring achievements and experience are presented in the lists. Finally, existing problems and promising research efforts in civil SHM are discussed, highlighting challenges and future trends.

Design and Implementation of a Mobile-based Sarcopenia Prediction and Monitoring System (모바일 기반의 '근감소증' 예측 및 모니터링 시스템 설계 및 구현)

  • Kang, Hyeonmin;Park, Chaieun;Ju, Minina;Seo, Seokkyo;Jeon, Justin Y.;Kim, Jinwoo
    • Journal of Korea Multimedia Society
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    • v.25 no.3
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    • pp.510-518
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    • 2022
  • This paper confirmed the technical reliability of mobile-based sarcopenia prediction and monitoring system. In implementing the developed system, we designed using only sensors built into a smartphone without a separate external device. The prediction system predicts the possibility of sarcopenia without visiting a hospital by performing the SARC-F survey, the 5-time chair stand test, and the rapid tapping test. The Monitoring system tracks and analyzes the average walking speed in daily life to quickly detect the risk of sarcopenia. Through this, it is possible to rapid detection of undiagnosed risk of undiagnosed sarcopenia and initiate appropriate medical treatment. Through prediction and monitoring system, the user may predict and manage sarcopenia, and the developed system can have a positive effect on reducing medical demand and reducing medical costs. In addition, collected data is useful for the patient-doctor communication. Furthermore, the collected data can be used for learning data of artificial intelligence, contributing to medical artificial intelligence and e-health industry.

A Study of 3-Dimension Graphic Monitoring System for Spent Fuel Dismantling Process

  • Kim, Sung-Hyun;Song, Tae-Gil;Lee, Jong-Youl;Yoon, Ji-Sup
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.73.1-73
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    • 2001
  • To utilize the uranium resources contained in the spent nuclear fuel generated from the nuclear power plants, the remote handling and dismantling technology is required. The dismantling process of the sport fuel is the most common process involved in the spent fuel recycling, the rod consolidation and the disposal processes. Since the machine used in the dismantling process are located and operated in isolated space, so called a hot cell, the reliability of machines is very important. To enhance the reliability of the process, in this research, the graphical monitoring system is developed for the fuel dismantling process. The graphic model of each machine is composed of many parts and every parts of the graphic model are given their own kinematics. Using the kinematics and simulating the graphic model in the virtual environment, the validity of the conceptual design can be verified before ...

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The Role of Child Studies for Child-Related Laws and Policies (아동관련법과 정책에 대한 아동학의 역할)

  • Cho, Songyon;Khil, Eun Bae;Choi, Hye Yeong
    • Korean Journal of Child Studies
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    • v.37 no.6
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    • pp.201-211
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    • 2016
  • Objective: The purpose of this study was to understand the role of specialists in child studies by analyzing child-related laws and policies and their service systems. Methods: We analyzed the aims, background, history, and related 5-year-plans in child-related laws and policies and their service delivery systems. Results: There were many difficulties in enforcing consistent policies. First, there was no unified age for implementing child and youth policy. Second, there was no comprehensive long-term policy. Third, many departments were involved. Conclusion: The study findings suggest the future role of specialists in child studies. First, they must take steps to introduce a monitoring system for the proper implementation of the first master plan for child policy. Second, they need to put effort into improving treatment of child-related workers. Third, they have to expand the academic area of child studies by reforming university curricula in a more pragmatic way. Fourth, the procedure to acquire different certifications in child studies and youth studies needs to be affiliated.