• Physical Therapy Rehabilitation Science
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• 제6권4호
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• pp.189-195
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• 2017

Objective: The purpose of this study was to examine the effects of real-time visual feedback weight shift training during golf swinging on golf performance. Design: Repeated-measures crossover design. Methods: Twenty-sixth amateur golfers were enrolled and randomly divided into two groups: The golf swing training with real-time feedback on weight shift (experimental group) swing training on the Wii balance board (WBB) by viewing the center of pressure (COP) trajectory on the WBB. All participants were assigned to the experimental group and the control group. The general golf swing training group (control group) performed on the ground. The golf performance was measured using a high-speed 3-dimensional camera sensor which analyses the shot distance, ball velocity, vertical launch angle, horizontal launch angle, back spin velocity and side spin velocity. The COP trajectory was assessed during 10 practice sessions and the mean was used. The golf performance measurement was repeated three times and its mean value was used. The assessment and training were performed at 24-hour intervals. Results: After training sessions, the change in shot distance, ball velocity, and horizontal launch angle pre- and post-training were significantly different when using the driver and iron clubs in the experimental group (p<0.05). The interaction time${\times}$group and time${\times}$club were not significant for all variables. Conclusions: In this study, real-time feedback training using real-time feedback on weight shifting improves golf shot distance and accuracy, which will be effective in increasing golf performance. In addition, it can be used as an index for golf player ability.

• PNF and Movement
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• 제17권2호
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• pp.177-187
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• 2019

Purpose: The purpose of this study was to investigate the effects of combined training on the physical fitness of male short distance athletes. Methods: Combined training was applied with CLT and isokinetric training three times a week for eight weeks. For CLT, elastic bands were used in the sitting and standing positions to gradually increase sprint and skating movements. Isokinetic training was conducted at $60^{\circ}/sec$ and $180^{\circ}/sec$ to improve muscle strength and muscle power. Results: After the application of combined training, strength (hand force) improved from 42.25 kg to 47.30 kg. Muscle power for standing long jump improved from 240.00 cm to 248.80 cm, while the sergeant jump improved from 55.00 cm to 58.00 cm. Isokinetic testing showed that muscle strength ($60^{\circ}/sec$) improved from 315.65 %BW to 365.79 %BW for the left extensor and from 306.60 %BW to 325.00 %BW for the right extensor. The left flexor improved from 177.23 %BW to 189.47 %BW, but the right flexor decreased slightly from 210.87 %BW to 201.53 %BW. Muscle power ($180^{\circ}/sec$) improved from 254.00 %BW to 293.00 %BW for the left extensor and from 256.00 %BW to 272.00 %BW for the right extensor. The left flexor improved from 150.00 %BW to 162.00 %BW and the right flexor from 145.25 %BW to 182.00 %BW. Conclusion: Combined training could be used as a physical training program for male short distance athletes.

• 재활복지공학회논문지
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• 제8권4호
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• pp.275-281
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• 2014

본 연구에서는 가이드 폭과 위치조절을 통해 퍼팅 시 순차적인 집중력 강화를 유도하여 퍼팅능력향상을 이끌어낼 수 있는 퍼팅훈련시스템을 개발하고 유용성을 평가하였다. 시스템의 하드웨어는 LEGO NXT 콘트롤러와 금속 Tetrix 세트를 이용하여 개발하였으며 소프트웨어는 LabVIEW ver. 2010을 사용하였다. 시스템의 유용성 평가를 위해 비숙련자 10인과 숙련자(KPGA) 5인에 대해 개발된 시스템의 폭 위치 변화 퍼팅훈련을 10세트 실시하고 의견을 조사하였다. 실험결과 손목부위에서의 속도 가속도 변화 감소 및 머리부위의 변위 감소를 확인할 수 있었으며, 의견조사에서 집중력 향상과 동기부여에 도움이 된다는 소견을 얻을 수 있었다. 본 시스템의 가이드 폭 위치 조절방식의 훈련법은 퍼팅을 위한 것으로 비슷한 운동구조를 갖는 노약자 장애인용 파크골프나 게이트볼 훈련에도 쉽게 적용이 가능할 것으로 판단된다.

• 해양환경안전학회지
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• 제24권3호
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• pp.311-318
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• 2018

In accordance with the stipulations of the STCW Convention, simulation training has been enforced in order to develop practical skills so as to prevent accidents by predetermining the risks in special marine environments. Simulation training is a useful way to acquire navigation abilities, and can continuously measure the ability of a trainee by applying an appropriate evaluation. However, the result of training is evaluated by the instructor's subjective judgment without quantitative criteria. Therefore, this study aims to quantitatively evaluate the effectiveness of simulation training. For this purpose, evaluation items were derived by analyzing legal standards, earlier studies, and the current status of MET institutions. The simulations were then performed three times in the same scenarios and analyzed the results. As a result, it has been shown that the objectively analyzed ability to keep the route and to make safe passage with other vessel, as well as subjectively evaluated ability by the apprentice officer has been improved as training progressed. Through the evaluation of simulation training results, it can be derived that simulation education needs supplementation, and can be provided as a basic form of data to quantify the evaluation results of the simulation training in the future.

• 산업경영시스템학회지
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• 제33권4호
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• pp.122-129
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• 2010

High-performance concrete (HPC) is a new terminology used in concrete construction industry. Several studies have shown that concrete strength development is determined not only by the water-to-cement ratio but also influenced by the content of other concrete ingredients. HPC is a highly complex material, which makes modeling its behavior a very difficult task. This paper aimed at demonstrating the possibilities of adapting artificial neural network (ANN) to predict the comprresive strength of HPC. Mahalanobis Distance (MD) outlier detection method used for the purpose increase prediction ability of ANN. The detailed procedure of calculating Mahalanobis Distance (MD) is described. The effects of outlier compared with before and after artificial neural network training. MD outlier detection method successfully removed existence of outlier and improved the neural network training and prediction performance.

• The Journal of Korean Physical Therapy
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• 제25권5호
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• pp.288-296
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• 2013

Purpose: This study was conducted in order to determine whether mechanical horseback-riding training depending on velocity can improve vestibular function and static postural balance on standing in healthy adults. Methods: For evaluation of vestibular function, electrooculography (EOG) of vertical and horizontal was performed for identification of the motion of eyes. For evaluation of static postural balance, COP distance, time spent on the sharpened Romberg test with neck extension (SRNE) were measured. Measurements were performed three times before training, three weeks after training, and six weeks after training. Participants were randomly assigned to three groups: fast velocity-mechanical horse -riding training (FV-MHRT, n=12), moderate velocity-mechanical horse-riding training (MV-MHRT, n=12), and slow velocity-mechanical horse-riding training (SV-MHRT, n=12). Results: According to the result for vertical, horizontal EOG, there was significant interaction in each group in accordance with the experiment time (p<0.05). The FV-MHRT group showed a significant decrease compared with the MV- MHRT, SV-MHRT groups (p<0.05). According to the result for static postural balance, the time spent, COP distance in SRNE showed significant interaction in each group in accordance with the experiment time (p<0.05). The time spent on the SRNE showed a significant increas in FV-MHRT, SV-MHRT (p<0.05). The COP distance of SRNE showed a significant increase in MV-MHRT (p<0.05). Conclusion: The MHRT velocity activated mechanism of vestibular spinal reflex (VSR), vestibular ocular reflex (VOR), also helped to strengthen vestibular function and static postural balance. In addition, it should be applied to different velocity of MHRT according to the specific purpose.

• 한국콘텐츠학회논문지
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• 제12권1호
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• pp.500-507
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• 2012

본 연구의 목적은 교양 골프를 수강하는 초보 골퍼 남자대학생 20명(운동군 10명, 통제군 10명)을 대상으로 8주간 메디신볼 던지기를 활용한 체중이동 트레이닝이 골프 관련 주요 체력 요인인 근력과 유연성, 골프수행력인 헤드스피드와 비거리에 미치는 영향을 규명하는데 있다. 주요 처치였던 메디신볼 던지기 트레이닝은 수업 시작 후 5주차부터 9주차까지 4주간은 3kg의 메디신볼을, 10주차부터 14주차까지 4주간은 5kg의 메디신볼을 허리 높이와 어깨 높이로 골프 스윙과 유사하게 어드레스, 백스윙, 폴로스루 동작으로 메디신볼 던지기 트레이닝을 실시한 결과는 다음과 같다. 메디신볼 던지기를 활용한 체중이동 트레이닝은 골프의 주요 체력 요인인 근력과 유연성에 유의한 차이를 나타냈으며, 골프수행력인 헤드스피드와 비거리에서도 유의한 결과를 나타냈다. 따라서 결론적으로 초보 골프 수강생들에게 중량있는 메디신볼 던지기를 활용한 체중이동 트레이닝은 골퍼의 체력 요인인 근력과 유연성의 향상은 물론 골프수행력인 헤드스피드와 비거리 향상에 긍정적인 변화를 가져와 준비운동을 겸한 주운동으로서도 매우 효과적인 트레이닝법이라고 사료된다.

• 수산해양기술연구
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• 제59권4호
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• pp.336-343
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• 2023

The aging fishery training vessels from the past have mostly been decommissioned, and many universities are introducing state-of-the-art large fishery training vessels. The purpose of these training vessels is to train marine professionals and above all, safety to prevent marine accidents should be of utmost priority as many students embark on the vessel. This study estimated the impact of the hydrodynamic interaction forces acting on the model vessel (fishery training vessel) from the bank when the vessel pass near the semi-circle bank wall in various conditions through the numerical calculation, especially concerning maneuvering motions of the vessel. For estimation, variables were mainly set as the size of the semi-circle shape, the lateral distance between the bank and the model vessel, and the depth near the bank. As a result, it was estimated that, in order for the model vessel to safely pass the semi-circle bank wall at a speed of 4 knots, the water depth to the vessel draft ratio should be 1.5 or more (approximately 8 m of water depth), and the lateral distance from the semi-circle bank wall should be 0.4 times the model vessel's length (L_pp) or more (a distance of 34 m or more). Under these conditions, it was expected that the model vessel would pass without significantly being affected by the bank wall.

• 한국콘텐츠학회논문지
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• 제13권9호
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• pp.476-484
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• 2013

본 연구에서는 교원 원격 연수의 연수 효과 제고를 위해 총 67종의 이러닝 콘텐츠에 대해 품질을 분석하였다. 분석결과 '연수 내용' 영역이 가장 품질이 높은 것으로 나타났으며 '교수 설계', '교수학습 전략', '평가', '상호 작용' 순이었다. '교수학습 전략', '평가', '상호 작용'은 품질인증 기준인 80점 미만의 점수를 나타내 이에 대한 개선이 필요한 것으로 나타났다. 인증된 콘텐츠와 부적합 콘텐츠 간의 품질 수준차이 분석에서는 '교수 설계', '교수학습 전략', '평가' 평가 영역 순으로 효과크기(ES)가 큰 것으로 나타났다. 평가 요인분석에서는 '화면구성', '교수학습 전략 선정' 등의 대부분의 평가 요인이 효과크기가 큰 것으로 나타났다. 본 연구를 통해 원격 연수를 위한 이러닝 콘텐츠 개발에서 어느 부분을 개선해야하는지 시사점을 제공할 수 있을 것으로 본다.

• 한국컴퓨터정보학회논문지
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• 제27권11호
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• pp.165-172
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• 2022

본 논문에서는 발달 장애 학생이 가상현실 콘텐츠로 직업 훈련을 수행하는 중에 콘텐츠가 부여한 과제를 이해하지 못하여 더 이상의 훈련을 진행하지 못하고 현재의 상태에 머물러 있는 상황이 발생했을 때 문제의 상태에서 스스로 벗어나서 훈련을 진행할 수 있도록 도움을 주는 행위, 즉 중재의 제공이 필요한 시점을 파악하는 방안을 연구하였다. 이를 위해, 선행 연구의 결과를 토대로 가상현실 기반의 바리스타 훈련을 수행할 수 있는 콘텐츠를 이용하여 커피 제조를 교육하는 과정에서 주어진 과제를 성공적으로 완수하기 위해 발달 장애 학생이 반드시 조작하여야 하는 바리스타 도구를 선정하고, 해당 도구와 발달 장애 학생의 왼손과 오른손과의 거리를 측정하여 통계적 분석을 통해 가설을 검증하였다. 손으로부터 관심 바리스타 도구 및 인접 도구들까지의 누적거리가 다른 바리스타 도구까지의 누적거리보다 상대적으로 긴 것으로 분석된 연구 대상자는 관심 바리스타 도구를 사용하고 있지 않을 확률이 크므로 해당 과제를 제대로 수행하고 있지 않다고 인식하고 중재를 제공할 시점이라고 판단할 수 있기 때문이다. 검증 결과, 왼손의 경우는 학생들의 훈련 수행의 성공 또는 실패 여부와 손과 바리스타 도구와의 거리간의 관계는 통계적으로 유의미하지 않은 것으로 분석되었으나, 오른손의 경우는 유의미하였다.