Effect of Rehabilitation Exercise for Golfers on the X-factor and Ground Reaction Force according to Phase of the Golf Swing

Junggyu yoon,Byungyun Cho 국제물리치료연구학회 2019 Journal of International Academy of Physical Ther Vol.10 No.1

Background: Despite frequent shoulder injuries of rotator cuff muscle of golfers by the result of overuse and poor swing mechanics, there is little research on shoulder specific rehabilitation exercises for injured rotator cuff muscle and golf swing Objective: To examined the effect of rehabilitation exercise for golfers on the X factor and ground reaction force (GRF) according to phase of the golf swing. Design: Crossover study Methods: The participants were 13 amateur golfers selected for a 4 week rehabilitation exercise for golfers. A rehabilitation exercise for golfers consisting of 5 steps and 4 items (sleeper stretch, full side plank, push up to plank, high plank knee unders) were applied to all participants. A three dimensional motion analyzer and force platform (SMART-E, BTS, Italy) were used to measure the X factor (angle between shoulder and pelvis at top of back swing) and GRF according to phase of the golf swing. All dependent variables were measured before and after exercise. The collected data was analyzed using the paired t test and SPSS 21.0. Results: The GRF had a statistically significant increase in the impact phase and ratio impact/weight after rehabilitation exercise for golfers (p<.05). The Xfactor, GRF in top of back swing and finish were no significant differences between before and after exercise (p>.05). Conclusions: These results suggested that rehabilitation exercise for golfers was effective for increasing GRF in the impact phase and ratio impact/weight for amateur golfer.

Effects of Golf Rehabilitation Exercise on Swing Power, Swing Speed, X-factor and Club Head Speed of Novice and Expert Golfer

Junggyu Yoon 대한스포츠물리치료학회 2019 정형스포츠물리치료학회지 Vol.15 No.2

Purpose: This study examined the effects of golf rehabilitation exercise on swing power, swing speed, X-factor and club head speed between novice and expert golfer. Methods: The participants were 12 novice and 12 experts. They participated in a golf rehabilitation exercise program for 6 weeks. This program consisted of 5 steps and 4 items (sleeper stretch, full side plank, push-up to plank, high plank knee unders). A three-dimensional motion analyzer was used to measure the X-factor (angle between shoulder and pelvis at top of backswing). Primus RS was used to measure the swing power and swing speed. The golf simulator was used to measure the clubhead speed. In the study, we compared the dependent variables before and after the exercise between the novice and expert. Results: Swing power, swing speed, X-factor, and clubhead speed were significantly increased after the exercise in both groups. There was no significant difference in swing power, swing speed, and X-factor between the groups, but the clubhead speed of expert golfers was significantly increased than that of the novice. Conclusion: This study exhibits that the rehabilitation exercise for golfers was effective for increasing swing power, swing speed, X-factor, and club head speed for both novice and expert golfers.

Risk of Development of Hepatocellular Carcinoma in Hepatitis B Virus-infected Cirrhosis Patients with Normal Alanine Aminotransferase Levels

Junggyu Lee,Dong Hyun Sinn,Geum-Youn Gwak,Jemma Ahn,Ju-Yeon Cho,Won Sohn,Yong-Han Paik,Moon Seok Choi,Joon Hyeok Lee,Kwang Cheol Koh,Seung Woon Paik,Byung Chul Yoo 한국간담췌외과학회 2014 한국간담췌외과학회 학술대회지 Vol.2014 No.4

Comparisons for the Abnormality of Breathing Pattern, Kinesiophobia and Flexion Relaxation Phenomenon in Patients with Chronic Low Back Pain and Healthy Person during Flexion and Extension of the Trunk

Junggyu Yoon 국제물리치료연구학회 2019 Journal of International Academy of Physical Ther Vol.10 No.2

Background: Most of the previous researches on the abnormality of breathing pattern have focused on the silence of functional movements owing to such abnormality, however, have not been clearly identified the relationship between the abnormal breathing pattern on one hand and kinesiophobia and flexion relaxation phenomenon (FRP) on the other hand. Objective: To compare patients with chronic low back pain (CLBP) and healthy person in the abnormality of breathing pattern, kinesiophobia, and FRP during flexion and extension of the trunk. Design: Case-control study. Methods: The research subjects consisted of a group of 15 healthy adults and another group of 15 patients with CLBP. Capnography was used to measure the endtidal CO2 (EtCO2) and respiratory quotient (RQ). The muscle activity of multifidus and erector spinae of the subjects was measured during flexion and extension of the trunk to identify their FRP. The Nijmegen Questionnaire (NQ) and Tampa Scale of Kinesiophobia (TSK) were utilized to measure their breathing patterns and kinesiophobia, respectively. The Kolmogorov-Smirnov (K-S) test was conducted in order to analyze the normal distribution of the measured data. Their general characteristics were identified by the descriptive statistics and the independent t-test was performed to identify the differences between the two groups in terms of abnormality of breathing pattern, kinesiophobia, and FRP. The level of significance was set at α=.05. Results: The patients with CLBP had significantly less EtCO2 and shorter breathing hold time (BHT) than normal healthy person (p<.05). The patient with CLBP also had significantly greater kinesiophobia than healthy person (p<.05), and had less FRP than the healthy person (p<.01). Conclusions: These results suggest that the CLBP had greater abnormality of breathing pattern and kinesiophobia with less FRP than healthy person.

The Effect of Frequency of Summary Feedback on the Proprioception in Knee Extension of Healthy Subjects

Junggyu Yoon 대한스포츠물리치료학회 2020 정형스포츠물리치료학회지 Vol.16 No.2

Purpose: This study investigated the effect of the frequency of summary feedback on proprioception during knee extension in healthy subjects. Methods: Forty-eight young adults volunteered to participate and were randomly assigned to one of four groups (1*summary, 5*summary, 10*summary, and control). The power and velocity errors for proprioception in knee extension were measured using a PRIMUS RS system (BTE Tech., Hanover, USA). Multivariate analysis of variance (MANOVA) was used to determine the effect of the frequency of summary feedback on proprioception in knee extension of healthy participants. Scheffe post hoc tests were applied, and the level of significance was set at α=0.05. Results: In the acquisition phase to practice the effect, power, and velocity error scores in all summary groups were significantly lower than those in the control group (p<0.05) but did not differ significantly between the summary groups (p>0.05). In the retention phase to assess the learning effect, the power and velocity error scores in all summary groups were also significantly lower than those in the control group (p <0.05), and the score in the 5*summary group was significantly lower than those in the other summary groups (p<0.05). Conclusion: 5*summary feedback was effective for motor learning while reducing the error of proprioception.

Trapped In Bloody Hell? Civilian Killing and Civil War Recurrence

JungGyu Eum,Geunwook Lee 한국국제정치학회 2023 The Korean Journal of International Studies Vol.21 No.3

Diskussion über das Thema „Verwaltungsvorschriften im deutschen und europäischen Verwaltungsrecht“

Junggyu Shin 한국토지공법학회 2018 한국토지공법학회 학술대회 Vol.- No.109

The oxidation effect of a Mo back contact on Cu(In,Ga)(Se,S)_<b>2</b> thin-film solar modules

Nam, Junggyu,Kang, Yoonmook,Kim, Dongseop,Baek, Dohyun,Lee, Dongho,Yang, JungYup Elsevier 2016 Solar energy materials and solar cells Vol.144 No.-

<P><B>Abstract</B></P> <P>We investigated the surface properties of a Mo back contact for large-area thin-film solar modules with high efficiency and good adhesion between Mo and the absorber layer. It was determined that the appropriate surface properties of Mo would improve the efficiency from 10% to above 15.0±0.21% and narrow the efficiency distribution in large-area modules. The Mo back contact was annealed at various temperatures between room temperature and 230°C in air to control the amount of sodium diffusing from the soda-lime glass substrate during selenization and sulfurization, and to improve the uniformity of the unit cell. Before the heat treatment, the amount of sodium in the patterned area of the unit cell was more than 10 times of that in the central area of the cell. The patterned region with higher Na content had smaller grains than those in the central area with less Na, resulting in many peel-offs and shunting paths. The difference in sodium content was reduced after heat treatment. The optimized surface oxide of the Mo back contact had a thickness of around 3–5nm and consisted of the MoO<SUB>3</SUB> phase. The grain boundary of Mo columnar structure near the surface consisted of the oxide layer.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The surface oxide layer (under 5nm) of Mo back contact improved the efficiency of large modules. </LI> <LI> The reason of the peel-off is the stress of thin film after selenization/sulfurization due to the grain size of CIGSS. </LI> <LI> Shunt paths were reduced after the oxidation of Mo back contact. </LI> <LI> The oxidation of Mo back contact reduced the difference between pattern region and the middle of unit cell. </LI> <LI> The heat treatment of Mo back contact was conducted in the range from room temperature to 230°C. </LI> </UL> </P>

통합학급 교사와 특수학급 교사가 인식하는 실천적 지식 내용에 대한 비교 연구

김정규 ( Junggyu Kim ) 한국특수아동학회 2015 특수아동교육연구 Vol.17 No.3

이 연구는 통합학급 교사와 특수학급 교사가 인식하는 실천적 지식 내용에 대한 인식을 알아보기 위하여 조사연구로 수행되었다. 장애학생이 재학하고 있는 초.중.고등학교의 통합학급 교사 196명과 특수학급 교사 196명의 자료를 분석하였으며 연구 문제를 알아보기 위하여 요인분석, t/F검증, 상관관계분석 및 회귀분석을 실시하였다. 연구의 결과는 다음과 같다. 첫째, 통합학급 교사는 실천적 지식 내용에 대한 구성영역 중 교사 자신의 지식이 가장 높게 나타났으며, 배경변인에 따라서는 교직경력만이 유의미한 통계적 차이가 나타났다. 구성요인간 상관관계는 통계적으로 유의미하게 나타났다. 둘째, 특수학급 교사는 실천적 지식 내용에 대한 구성영역 중 교사 자신의 지식에 대한 요인에 대하여 가장 높게 인식하고 있었으며, 배경변인에 따라서는 성별과 최종학력에서 유의미한 통계적 차이를 보였다. 구성요인간 상관관계는 통계적으로 유의미하게 높게 나타났다. 셋째, 통합학급 교사와 특수학급 교사의 인식은 개인교직관 지식과 학교역할 지식 요인을 제외한 모든 요인에서 유의미한 수준의 차이를 보였다. 통합학급 교사와 특수학급 교사가 인식하는 실천적 지식 내용에서 차이가 존재한다는 것은 통합교육 지원 프로그램의 차별성이 요구된다는 것을 이 연구에서는 시사하고 있다. The purpose of this study was to compare what were the differences in the recognition to contents of practical knowledge(CPK) between general and special class teachers. The general class teachers were teaching the students with disabilities in the level of elementary, middle and high school who were studying at the special classes. The special class teachers and the general class teachers were working at the same environment. 196 general class teachers and 196 special class teachers were participated for this study. The factor analysis, reliability, t-test, and regression were utilized for this study. The results of this study were that: (a) general class teachers indicated with statistically differences to the CPK based on teaching experience factor. The general class teachers recognized that the instruction structure knowledge and teaching contents knowledge were most important in the CPK; (b) the special class teachers had statistically differences in the CPK according to gender and master degree background variables, however the instruction adapt knowledge and instruction structure knowledge in CPK were most important factors rather than the other factors of CPK; and (c) the general class teachers’ and special class teachers’ recognition toward the CPK recognized differently. The special class teachers had more positive to CPK rather than those of the general class teachers. This study suggested that how to support the general class teachers to increase the attitudes to CPK for all students.

Wheel Travel(MEJ)량이 Extreme과 Durability Load에 미치는 영향에 대한 고찰

김정규(Junggyu Kim),강오성(Ohsung Kang),이육희(Yukhee Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11

Today’s automotive companies are working communization for parts to shorten the development cycle and cost competitiveness as a policy. Even if parts are communized, high-performance tires and suspension tuning are required to enhance R&H performance and trim height is set up lowering for styling. The service loads transmitted to suspension and body structure are related to suspension types, tire characteristics and wheel travel values. Especially, wheel travel values are the important factor for vertical loads. Since the loads to WFT on the other hand aren’t changed considerably according to wheel travel values. To investigate the load performance for vehicles which have different wheel travel values, this paper presents the modeling methods of nonlinear components for building analytical vehicle models which are simulated on pothole roads and rough random roads such as Belgian block and estimates peak load values on pothole roads and pseudo damage levels on Belgian block road.