골프 Putting 동작 시 프로선수와 아마추어간의 3차원 운동학적 변인 비교분석

김의환,박정현,백광현 한국운동역학회 2001 한국운동역학회지 Vol.10 No.2

The purpose of this study was to compare of the kinematic variables, as competition situation putting stroke(PS) between Korean pro. and ama.- golfers, by the 3 dimensional analysis. The subjects were three pro-golfers who are competitioning in the fields and three ama.-trainees. Kinematic variables(temporal, distance, and velocity variables of golf club-head) were computed through motion analysis system, by videography(30f/s. from the front and side view). From the data analysis and discussion, conclusions were as follows : 1. Temporal variables : The elapsed time(ET) during PS, pro(1.32sec.) was 0.10 sec. longer than ama.(1.22sec.), the ratio comparison of ET each phase during PS, pro(0.40sec.,30.38%) was 6.28% longer than ama.().30sec. 24.1%) in back-swing phase, pro(0.25sec, 17.7%) was 4.2% shorter than ama.(0.27sec., 21.9%) in down-swing phase, ratio of ET in backswing and downswing was average 1.60 : 1 by pro., and 1.11:1 by ama.-golfers, respectively. 2. Distance variables : The distance of club-head during PS, pro.(21.8cm) was 10.2cm shorter than ama.(32.0 cm), distance of 2nd half part in PS from impact to follow through top, pro.(46.2cm) was 11.6cm shorter than ama.(57.8cm), distance of 2nd half part of PS, pro(46.2/21.8cm) was 2 times over than 1st half part, ama.(32.0/57.8cm) was 2 times under than 1st half part, respectively. 3. Velocity variables : The velocity of club-head during PS, pro.(1.21m/sec.) was 1/2 times slower than ama.(2.37m/sec.) in over all, BS, DS and FT in PS, pro.(0.9, 1.6, and 1.15m/sec.) was slower than ama.(1.95, 3.19 and 1.96m/sec.), respectively. Over all, pro. was more stable than ama. in PS. <end>

테니스 양손 백핸드 드라이브동작의 중심, 속도변인의 키네메틱분석

김의환,성영호,김성섭,백광현 龍仁大學校 體育科學硏究所 2003 體育科學硏究論叢 Vol.13 No.1

The purpose of this study was to analysis the kinematic variables of two-handed backhand drive in tennis pretending just as real competition situation. Two male Korean juvenile top player who was gold medalists and award in national championships 2000, was filmed on 16㎜ high speed cameras(Photo-sonic co., l00fps, from the front, side view) on performing in two-handed backhand drive in tennis stroke throughout the ball machine(Lob star co., 50㎞/h. on ball speed) by the method of three-dimensional analysis. The kinematic variables, temporal, posture, center of gravity and ball velocity were computed through film analysis. The results were as follows; 1. Center of gravity(COG) variables : The COG of right and left in horizontal aspect showed the large move to the left, and when follow through, subject A had a move to the left, and subject B had a move to the right(6.4cm) slightly. The COG of forward and backward in horizontal aspect showed that subject A had a move to the backward, and subject B had a move to the forward, and until impact, they moved to the forward When follow through, there was a move to the backward, and it showed a trend that subject A was a defensive style and subject B was an offensive style. The COG of up and down in vertical aspect was 88.lcm - 93.3cm in height from the ready position to the follow through, and when stroke, the COG of up and down showed the movement range, 5.2cm. 2. Ball velocity variable : The maximum returned ball speed right after the impact was shown after about 0.036sec., and at this time, subject A had 38.4m/sec., and subject B had 34.5m/sec. respectively. The variable influencing on the ball speed was the variable of posture such as the elbow angle, the shoulder angle and also including the variable of COG in the forward and backward.

패러글라이딩 전방이륙시 라이즈-업 동작의 키네매틱 분석

김의환,조효구,백광현 한국운동역학회 2000 한국운동역학회지 Vol.9 No.2

본 연구는 항공스포츠 중 몇 년 사이에 급속도로 발전한 패러글라이딩(paragliding)의 전방이륙(take off)기술 중 라이즈-업(rise-up) 동작에 관한 키네매틱 변인의 기초자료를 얻는데 그 목적이 있다. 연구의 목적을 달성하기 위하여 대한패러글라이딩협회에 등록된 Y.대학 남자선수 10명을 대상으로 라이즈-업 동작을 각 5회씩 실시하여 연구자가 그 중에서 가장 잘된 동작 1회를 비디오 테입에 편집하여 국내 패러글라이딩 전문가에게 평가를 의뢰하여 상위 5명을 선정한 후 키네매틱 변인을 분석하였으며 결과는 다음과 같다. 시간변인에 있어서 제 1국면이 전체 소요시간 중 57.45%(1.53sec)가 걸렸으며 2국면의 소요시간이 길수록 전체시간이 증가하는 것으로 나타났다. 거리변인에서는 제 2,3국면보다 제 1국면에서의 소요거리(2.25±0.36cm)가 51.49%로 가장 길게 나타났다. 각도변인에 있어서 팔꿈치각은 어깨각과 함꼐 상호 보상작용을 통한 캐노피의 균형을 유지하는 역할을 수행하는 것으로 나타났으며, 발목각은 피험자 개개인의 신장과 보폭의 차이에서 발생하는 편차가 종목 특성으로 큰 차이를 보였다. 또한, 상체 전경각에 있어서 저항이 큰 Cg이벤트에서 굴곡이 이루어졌다가 Hp이벤트에 와서는 신전 시킨 후 캐노피와의 견제를 위한 굴곡이 다시 이루어진 것으로 나타났다. 속도변인으로는 신체중심의 속도변화에서 출발신호와 함께 진행방향의 역방향으로 -0.02m/sec의 탄력적인 신체중심의 준비형태를 보였다. The purpose of this thesis is to investigate the basic Data Bases which were based on the rise up motion through kinematic variables analysis of rise up motion among the take off technique of the paragliding. To understand this thesis I made use of three dimensions cinematography through DLT method and also analyzed the kinematic variables through velocity variables, distant variables, angle variables and temporal variables. Therefore the conclusion were as follow The first phase is time required of use 57.46%(1.53sec) the total of the time, and second phase of the time longer than increase of the total time. For the first phase distance required of use 51.49%(2.25±0.36m) longer than second and third phase. In case of the valicity change of center of gravity of each events was showed toward -0.02m/sec.

Site-directed Immobilization of Antibody onto Solid Surfaces for the Construction of Immunochip

Paek, Se-Hwan,Cho, Il-Hoon,Paek, Eui-Hwan,Lee, Haewon,Park, Jeong-Woo The Korean Society for Biotechnology and Bioengine 2004 Biotechnology and Bioprocess Engineering Vol.9 No.2

The performance of an immuno-analytical system can be assessed in terms of its analytical sensitivity, i.e., the detection limit of an analyte, which is determined by the amount of analyte molecules bound to the capture antibody that has been immobilized onto a solid surface. To increase the number of the binding complexes, we have investigated a site-directed immobilization of an antibody that has the ability to resolve a current problem associated with a random arrangement of the insolubilized immunoglobulin. The binding molecules were chemically reduced to produce thiol groups that were limited at the hinge region, and then, the reduced products were coupled to biotin. This biotinylated antibody was bound to a streptavidin-coated surface via the streptavidin-biotin reaction. This method can control the orientation of the antibody molecules present on a solid surface and also can significantly reduce the possibility of steric hindrance in the antigen-antibody reactions. In a two-site immunoassay, the introduction of the site-directly immobilized antibody as the capture enhanced the sensitivity of analyte detection approximately 10 times compared to that of the antibody randomly coupled to biotin. Such a novel approach would offer a protocol of antibody immobilization in order for the possibility of constructing a high performance immunochip.

Immunosensors for Point-of-Care Testing

Se-Hwan Paek(백세환),Joung-Hwan Cho(조정환),Sun-Young Choi(최선영),Eui-Hwan Paek(백의환) 한국생물공학회 2004 한국생물공학회 학술대회 Vol.2004 No.4

Development of an Enzyme Immunosensor for Point-of-care-testing

Joung-Hwan Cho(조정환),Eui-Hwan-Paek(백의환),Se-Hwan Paek(백세환) 한국생물공학회 2004 한국생물공학회 학술대회 Vol.2004 No.10

The Comparison of 3-D Kinematics during Putting Stroke between Korean Pro. and Ama.-Golfers

( Eui Hwan Kim ),( Jeong Hyun Park ),( Kwang Hyun Paek ) 한국운동역학회 2005 한국운동역학회 논문 영문초록집 Vol.2005 No.-

Kinematic Analysis of Take off Rise-Up Motion in Paragliding

( Eui Hwan Kim ),( Hyo Gu Cho ),( Kwang Hyun Paek ) 한국운동역학회 2005 한국운동역학회 논문 영문초록집 Vol.2005 No.-

팔레높시스 원괴체 유사체의 증식을 위한 적정계대배양 횟수

홍의연(Eui Yon Hong),윤종선(Jong Sun Yun),김익환(Ik Hwan Kim),윤태(Tae Yun),김태수(Tae Su Kim),백기엽(Kee Yoeop Paek) 한국원예학회 2003 한국원예학회 학술발표요지 Vol.2003 No.5

Correction with blood T1 is essential when measuring post-contrast myocardial T1 value in patients with acute myocardial infarction

Choi, Eui-Young,Hwang, Sung Ho,Yoon, Young Won,Park, Chul Hwan,Paek, Mun Young,Greiser, Andreas,Chung, Hyemoon,Yoon, Ji-Hyun,Kim, Jong-Youn,Min, Pil-Ki,Lee, Byoung Kwon,Hong, Bum-Kee,Rim, Se-Joong,Kwo BioMed Central 2013 Journal of cardiovascular magnetic resonance Vol.15 No.-

<P><B>Background</B></P><P>Post-contrast T1 mapping by modified Look-Locker inversion recovery (MOLLI) sequence has been introduced as a promising means to assess an expansion of the extra-cellular space. However, T1 value in the myocardium can be affected by scanning time after bolus contrast injection. In this study, we investigated the changes of the T1 values according to multiple slicing over scanning time at 15 minutes after contrast injection and usefulness of blood T1 correction.</P><P><B>Methods</B></P><P>Eighteen reperfused acute myocardial infarction (AMI) patients, 13 cardiomyopathy patients and 8 healthy volunteers underwent cardiovascular magnetic resonance with 15 minute-post contrast MOLLI to generate T1 maps. In 10 cardiomyopathy cases, pre- and post-contrast MOLLI techniques were performed to generate extracellular volume fraction (Ve). Six slices of T1 maps according to the left ventricular (LV) short axis, from apex to base, were consecutively obtained. Each T1 value was measured in the whole myocardium, infarcted myocardium, non-infarcted myocardium and LV blood cavity.</P><P><B>Results</B></P><P>The mean T1 value of infarcted myocardium was significantly lower than that of non-infarcted myocardium (425.4±68.1 ms vs. 540.5±88.0 ms, respectively, p< 0.001). T1 values of non-infarcted myocardium increased significantly from apex to base (from 523.1±99.5 ms to 561.1±81.1 ms, p=0.001), and were accompanied by a similar increase in blood T1 value in LV cavity (from 442.1±120.7 ms to 456.8±97.5 ms, p<0.001) over time. This phenomenon was applied to both left anterior descending (LAD) territory (from 545.1±74.5 ms to 575.7±84.0 ms, p<0.001) and non-LAD territory AMI cases (from 501.2±124.5 ms to 549.5±81.3 ms, p<0.001). It was similarly applied to cardiomyopathy patients and healthy volunteers. After the myocardial T1 values, however, were adjusted by the blood T1 values, they were consistent throughout the slices from apex to base (from 1.17±0.18 to 1.25±0.13, p>0.05). The Ve did not show significant differences from apical to basal slices.</P><P><B>Conclusion</B></P><P>Post-contrast myocardial T1 corrected by blood T1 or Ve, provide more stable measurement of degree of fibrosis in non-infarcted myocardium in short- axis multiple slicing.</P>