테니스 라켓 스트링 장력의 차이에 따른 근전도 분석

이훈식,서국웅,윤양진,정미라,김용재,서국은,이중숙 한국운동역학회 2000 한국운동역학회지 Vol.9 No.2

The purpose of this paper is to select 7 male athletes and female athletes of high school, and to compare their active potential differences of upper arm muscles according to characteristic of a racket. the results obtained are as follows: 1. In the accumulative distribution rate of racket string tension, 65Ibs is higher in all muscle active potentials except male flexor carpi radialis muscle than 55Ibs or 60Ibs, and this result shows that 65Ibs gives lower efficiency to athletes. 2. In the muscle load rate of racket string tension, 55Ibs shows the lowest active muscle potential and is thought to be better in its efficiency, but 66Ibs shows a little high active potential and is thought not to be good in its efficiency.

카약선수의 패들링 동작 시 발생되는 EMG 패턴분석J

이훈식,김정태,안정덕 한국스포츠리서치 2006 한국 스포츠 리서치 Vol.17 No.6

3차원 분석법의 적용 : DLT 방식 DLT(Dircet Linear Transformation) Method

서국웅,윤양진,김용재,이훈식 釜山大學校 附設 體育科學硏究所 1995 體育科學硏究所 論文集 Vol.11 No.-

The purpose of this study was to maximize the application of 3-d cine-photogrammetry, in which the DLT(Direct Linear Transformation) technique is used, by searching for some practical methods of application, and to develop a comprehensive package of programs of 3-d analyses. The raw digitized coordinate date were processed by a personal computer with the developed package. Two kinds of control-point-frame(pyramid, range pole), and a synchro-timer were designed and utilized in the study. Two theodolites were used of the angle measurements of the control points. The conclusions are as follows 1. Range pole system was much superior to control point pyramid system in the applicability of the control point frame. There was no significant difference between the calculated average length using the range pole system and the actual length of the rotation rod. 2. The automatic numerical aligning technique for the digitizing apparatus reduced the RMS of residuals of the control point space coodinates. But the optional distortion was not corrected by the correction model. 3. The application of the synchro-timer which was designed and used for the study was proved. But the standard deviation of the time interval between adjacent frames was affected by the quality of the image. 4. As a result of adopting unique of calculations of the control point space coordinates, the ratio of the power of the control point reconstruction to the size of the control point frame was reduced greatly

Tennis Forehand Topspin Stroke의 역학적 분석

서국웅,박순자,서국은,이중숙,이훈식 釜山大學校 附設 體育科學硏究所 1991 體育科學硏究所 論文集 Vol.7 No.-

The aim of this treatise is to give some help to the beginners and in structors in understanding to importance and the Kinematics and Kinetics of forehand topspin stroke by providing them with the results obtained from the comparative analysis of the forehand topspin stroke movements. To carry out this study, one male and female university students were selected as subjects and they are A, B : A and B are skilled players with over 10 Years of experience(A: male B: female) And many pictures of the subjects in forehand topspin stroke were taken with 16mm high speed camera(250fps) and they were analyzed with a film motion analyzer on the phase of the locus the strobo, the displacement, the velocity, the force, the momentum, the energy, the power. The following are comparative analysis data of the racket movement of each subject in forehand topspin stroke: 1. In case of male player, the movement of the center of gravity and the ball control are stable but, the power decrease. 2. In case of female player, in the state of back swing potential energy and acceleration was higher, and the strong power made but ball control had some problems in beginners but the excellerant player showed the merit point. 3. In the performance of forehand topspin stroke, it is recommended that one should have the habit of getting a adequate swing practicing form based upon individual physical characteristics rather than heightening the velocity of swing.

步速變化에 따른 미끄러짐의 생체역학적 연구

서국웅,윤양진,서국은,이중숙,김용재,이언석,이훈식 釜山大學校 附設 體育科學硏究所 1992 體育科學硏究所 論文集 Vol.8 No.-

The purpose of this study was to analyze walking steps to prevent unnecessary energy consuming and prevention of injury from sliding when someone was walking. The questionnaire, high speed video system, E.M.G. system, and force platform system were used to analyze sliding mechanism in biomechanical perspective. Several results were found as following: 1. According to questionnaire regarding sliding, 93.3% of participants have sliding experiences. People have sliding experiences by greasy floor(48.4%) and obstacle (22.5%). Sliding types were found from different kinds of shoes such as sneakers (48.8%) and boots (34.2%). The results were presented as following 44.6% of participants were fall down front direction and 40.3% of people fell down rear side. 2. According to the high speed video system analyzer, step sliding increased with increasing step speed from distance and acceleration speed experiment with 80 steps/min, 100 steps/min, 120 steps/min. Also, the most sliding were occurred with sneakers, boots, and bare feet as order. 3. According to E.M.G. test results, the vastus lateralis M., the vastus medialis m., and the tibialis anterior m. of electric action potential presented strongly when participants fell front, rear, and right side. The vastus lateralis m. and the tibialis anterior m. of electric action potential presented strongly when someone fell left side, but the vastus medialis m. and the gastrocnemius m. of electirc action potential presented as weaker. 4. According to the force platform test results, the most big change of floor antipower of x-axis presented when someone fell the left side. The most of big change of floor antipower of y-axis presented when someone fell down rear side. The most of big change of floor antipower of z-axis presented similarly when someone fell the front, rear, left, and right side.

110m 허들링시 하지의 E. M. G. 분석

이훈식,서국웅,윤양진 釜山大學校 附設 體育科學硏究所 1996 體育科學硏究所 論文集 Vol.12 No.-

The purpose of this study was to measure an strengths of electromyogram activity of anterior tibial muscle, gastrocnemius muscle, medial vastus muscle during take-off, air-borne, and landing phase in the 5th hurdle section. gastrocnemius. The subjects for the paper included two general hurdlers and college one's. The result of measurement is as follows. 1. The analysis of the agonist muscle in the 5th hurdle 1) The variation of gastrocnemius muscle is the hightest during take off of lead leg and the variation degree of cut leg is put in order, gastrocnemius muscle, medial vastus muscle, anterior tibial muscle. 2) The variation degree of both lead leg and cut leg during air-bone phase is put in order, medial vastus muscle, gastrocnemius muscle, anterior tibial muscle. 3) The variation of medial vastus muscle is the lowest during landing phase of lead leg and there is little variation difference about cut leg among gastrocnemius muscle, medial vastus muscle, and anterior tibial muscle.

중량물 운반시 잡기유형에 따른 근전도 분석

이훈식,강영택,윤양진,정미라,유국종,서국웅,김정태 釜山大學校 附設 體育科學硏究所 1999 體育科學硏究所 論文集 Vol.15 No.-

The purpose of this study was to examine EMG changes of the body according to method the holding during carrying object. The experiments were conducted with utilizing EMG analyses for five male and five female adults as subjects. The results were as followed. 1. The higher muscle action potential of vertical holding was shown than that of right holding when carrying objects in MMH work in proportion to the weight of the object. The came from the subjects using their brachial muscles much to maintain the angles of their wrist joints and elbow joints for keeping their stable postures while walking. 2. The higher muscle action potential of right holding was shown in right and left elector-muscles of their spines(L1-L2, L4-L5) while carrying in all stages of weights except 25kg objects than that of vertical holding. These results were caused from more use of brachial muscles than elector-muscles of spines in carrying weight objects. So vertical holding is more effective in carrying weight objects at a short distance than right holding.

호텔종사원의 내부브랜딩활동이 브랜드태도및 구전의도에 미치는 영향

이훈식 ( Hun Sik Lee ),최우성 ( Woo Sung Choi ) 한국관광산업학회 2014 Tourism Research Vol.39 No.2

인적서비스가 가장 가치 있는 자산으로 여겨지는 호텔기업에 있어 인적서비스를 제공하는 종사원이 지각하는 내부브랜딩활동에 대한 연구는 중요하다고 할 수 있다. 이에 본 연구에서는 호텔종사원을 대상으로 그들이 지각하는 내부브랜딩활동이 브랜드태도 및 구전의도에 어떠한 영향을 미치는지를 실증적으로 분석하였으며 다음과 같은 연구결과가 도출되었다. 첫째, 내부브랜딩활동에 대해 높게 지각하면 브랜드태도가 높아지는 것으로 나타났다. 따라서 기업에서 고객에 대한 브랜딩활동도 중요하지만 내부고객인 종사원의 브랜딩활동도 중요한 마케팅활동임을 알 수 있었다. 이에 호텔기업에서는 내부고객인 종사원들의 내부브랜딩활동과 관련하여 자사 브랜드의 지향 모습을 전 사원이 공유할 수 있도록 하는 내부커뮤니케이션 활성화에 대한 노력이 필요하며 기업이 운영하는 브랜드가 어떠한 가치를 전달하고, 약속을 실현해야 하는가에 대한 지식과 자사 기업에 대한 자긍심을 심어 줄 수 있는 내부 경영에 대한 관심과 노력이 증대되어야 할 것이다. 둘째, 브랜드태도에 대해 높게 지각하면 구전의도는 높아지는 것으로 나타났다. 이는 기업에서 종사원들이 브랜드태도에 대해 긍정적인 생각을 가질 수 있도록 노력을 해야 한다는 것이다. 이를 위해 내부마케팅활동, 즉 내부고객만족을 위한 금전적 보상이나 비금전적 보상을 제공하여야 할 것이며 종사원들의 능력을 다할 수 있도록 환경조성이 필요하다. 더욱이 중요한 것은 자사의 브랜드에 대한 교육과 훈련을 통해 자사 브랜드에 대한 내부브랜딩활동 강화를 하여야 할 것이다. As human resource is the most important asset in the hotel industry, internal marketing has been a significant topic in research on hotel enterprises. In this respect, this study aims to empirically demonstrate the effect of internal branding activities on brand attitude and Word of Mouth among hotel employees. First, it is found that hotel employees with higher perception of internal branding activities tend to have higher perception of brand attitude. This implies that branding activities should focus not only customers but also employees as internal customers. Therefore, hotel enterprises need to pay more attention to internal marketing by sharing the information of their branding activities with all employees as internal communication activities. Second, hotel employees with higher perception of brand activities tend to have higher intention of Word of Mouth. This results indicate that hotel enterprises`` branding activities allow their employees to have positive attitude toward their brands. Therefore, to increase employee satisfaction, hotel enterprises need to provide monetary or non-monetary rewards and to create environments that help employees to show their abilities.

EMED system의 활용방안에 대한 이론적 고찰

이훈식,서국웅 釜山大學校 師範大學 1998 교사교육연구 Vol.35 No.-

When we compare the result of pedar system with that of ground reaction system, the former has more errors in both time and force variation than the latter. Data value measured by pedar system is usually less than that measured by emed system. There must not be the difference between the condition of wearing both shoes and oratoric and that of wearing only shoes, but it is reported that there is difference between them(이성철외 1인). Because the range of using emed system is limited according to its types, the result of ground reaction system is more exact than that of pedar system. Therefore, The choice of experiment equipments fitting for experimental conditions and their practical application are sufficiency taken into consideration. In short, in using emed system, we have to do preliminary experiments and exact material testing. Then, we can use it as experimental equipments and minimize the errors caused by the differences among experimental equipments. In particular, if pedar system should be used in various kinds of sports, it is most desirable to use it in measuring the load amount of each foot part working between shoes and insole.

파라메트릭 스터디를 통한 다양한 조건에서의 열압축기 성능의 수치 해석 연구

이훈식(H.S. Lee),민대호(D.H. Min),김종암(C. Kim) 한국전산유체공학회 2017 한국전산유체공학회 학술대회논문집 Vol.2017 No.11