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홍순모,신성휴 韓國體育大學校附屬 體育科學硏究所 1998 韓國體育大學校附屬 體育科學硏究所論文集 Vol.17 No.1
The purpose of this study was to examine the kinematical characteristics on the rotational motion in discuss throwing, and to grope for the better discuss throwing technique. The subjects, four collegiate discuss throwing players, were the standing player. 2S-VHS video cameras were used for the data collection. The Direct Linear Transformation(DLT) technique was employed to obtain 3-D position coordinates of 21 landmarks(20 body and 1 disk landmarks(Abdel-Aziz & Kararah, 1971) and a cubic spline function was used for smoothing and differentiation. It also calculates the location of center of mass using Plagenhoef's data. In this study, the rotational motion was divided into 4 events(ROF, RON, LON and REL) and two phases(LT, RT for the data analysis. From those, time duration, displacement of COG, velocity of COG and discuss, and trunk and release angles were calculated, and the following conclusions were drawn: 1. Last phase(LT) showed relatively shorter in time than the other phases. 2. In the displacement of COG, first phase(LT) showed longer displacement in horizontal direction, last phase(RT) showed longer displacement in lateral-medial direction and vertical direction 3. Last(RT) showed faster in the horizontal, lateral-medial and verical velocity. 4. At release, horizontal velocity was superior than lateral-medial and vertical direction. 5. The players rotated their body with backward. 6. The angular velocity of body was larger in beginning of rotation.
Rho-kinase/AMPK axis regulates hepatic lipogenesis during overnutrition
Huang, Hu,Lee, Seung-Hwan,Sousa-Lima, Inê,s,Kim, Sang Soo,Hwang, Won Min,Dagon, Yossi,Yang, Won-Mo,Cho, Sungman,Kang, Min-Cheol,Seo, Ji A.,Shibata, Munehiko,Cho, Hyunsoo,Belew, Getachew Debas,Bhi American Society for Clinical Investigation 2018 The Journal of clinical investigation Vol.128 No.12
경화용 저합금 강 (Cr-Si 강) 의 전자현미경 조직에 관한 연구
김상주,이후철,성창모 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.4
The variations in tensile properties and volume fractions of retained austenite in three 0.27%C steels containing chromium and silicon during tempering following 900℃ oil quenching were investigated. Microscopic changes during tempering were also studied using transmission electron microscopy. Silicon raised the tensile strength of as quenched and tempered steels and delayed the decomposition of retained austenite up to 300℃. Chromium also delayed the decomposition of martensite, but the effect was far less significant than that of silicon. The yield stress of silicon containing steel was raised while the tensile stress was decreased with increased tempering temperature up to 400℃. This yield behavior was discussed in relation to the carbon clustering and the decomposition of retained austenite during tempering. Silicon not only delays the recovery and recrystallization of martensite but also refines the carbide particle size.
Kim, Hong Mo,Jeon, In-Yup,Choi, In Taek,Kang, Sung Ho,Shin, Sun-Hee,Jeong, Hu Young,Ju, Myung Jong,Baek, Jong-Beom,Kim, Hwan Kyu Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.23
<P>A dye-sensitized solar cell (DSSC), one of the present photovoltaic technologies, has always been associated with some problems that make them unsatisfactory for practical use. Among them, developing low-cost, durable, and highly active electrocatalysts such as platinum (Pt) alternatives is one of the urgent issues for practical and/or large-scale commercial applications. In this study, as one of the feasible Pt alternatives, edge-selectively antimony-doped graphene nanoplatelets (SbGnPs) were prepared by a simple eco-friendly mechanochemical reaction between pristine graphite and Sb powder for the use of a counter electrode (CE) in dye-sensitized solar cells, for the first time. The selective doping of metalloid Sb at the edges of graphene nanoplatelets (GnPs) and their structure were confirmed by various analytical techniques including atomic-resolution transmission electron microscopy (AR-TEM). The resultant SbGnPs exhibited a much lower charge-transfer resistance (R-ct) compared to that of Pt as electrocatalysts toward a Co(bpy)(3)(2+/3+) (bpy = 2,2'-bipyridine) redox couple, displaying 'zero loss stability' of electrocatalytic activity for the Co(bpy)(3)(3+) reduction reaction even after 1000 potential cycles. DSSCs employing Co(bpy)(3)(2+/3+) were systematically evaluated in a comparison with the N-doped graphene nanoplatelet (NGnP) CE as a reference. The SbGnP-CE-based DSSC employing an SGT-021 sensitizer based on a D-pi-A structured zinc(II)-porphyrin showed better power conversion efficiency (12.08%) than the Pt (11.26%) or the NGnPs (11.53%). The outstanding electrocatalytic activity of the SbGnPs with an unusual electrochemical stability suggests that they could be a possible candidate as the best alternative to a Pt-CE for DSSCs in conjunction with cobalt electrolytes.</P>
홍순모 ( Soon Mo Hong ),신성휴 ( Sung Hu Shin ),이순호 ( Soon Ho Lee ) 한국스포츠정책과학원(구 한국스포츠개발원) 2005 체육과학연구 Vol.16 No.4
본 연구는 남자 국가대표선수들을 포함한 우수선수들을 대상으로 원반던지기 기술동작의 운동학적 요인 및 신체의 각운동량의 변화에 대한 특성 분석을 통해 훈련현장의 기초 자료로 활용하는 데 목적이 있으며, 결론은 다음과 같다. 원반던지기 기술동작의 수행시간은 평균 1.57 ± 0.12초로 나타났으며, 대상자들의 기록과 상관성을 보이지 않았다. 이벤트 간 평균소요시간이 가장 짧게 나타난 구간은 E2~E3구간으로 0.11초로 나타났다. 국면별 평균소요시간은 1.18초(P1), 0.34초(P2), 0.16초(P3)로 나타났다. 릴리즈 시 평균 투사속도는 22.2m/sec, 평균 투사각은 38.0° 그리고 평균 공격각은 -8.7°로 나타났으며, 비교적 높은 투사각과 편차가 큰 공격각을 보였다. 릴리즈 시 원반의 평균 높이는 1.88m(102%Ht)로서 비교적 높게 나타났다. 신체의 각운동량은 일반적으로 E2 직전에서 평균 67.6kg m2/sec으로서 최대값(prior. max)이 나타났고, 각 이벤트별 평균 각운동량은 57.0kg m2/sce(E2), 56.7kg m2/sec(E3), 59.3kg m2/sec(E4) 그리고 47.5kg m2/sec(E5)로 나타났다. The purpose of this study was to provide fundamental information on coaching in discus throwing by analyzing the kinematic factors and angular momentum characteristics on performance skill. The subjects were nationally ranked five male players. The direct linear transformation (DLT) method was used in calculating 3D coordinate of digitized body segment. The conclusions were as follows. The performance time of technique motion was 1.57±0.12sec as an average. It was not related to the record of all subject. The shortest time of phase was 0.11sec of E2~E3 as an average. The performance time in event was 1.18sec (P1), 0.34sec (P2), 0.16sec (P3) as an average. Mean velocity, angle and attack angle at the release were 22.2m/s, 38.0degree and -8.7degree respectively. It showed relatively high in release angle and large variance in attack angle. And the release height of discus showed 1.88m (102%Ht) relatively. It was high then was expected. Maximum angula momentum came 67.6 ㎏ m2 / sec before E2. The angula momentum in event showed 57.0㎏ m2 / sec (E2), 56.7 ㎏ m2 / sec (E3), 59.3 ㎏ m2 / sec (E4) and 47.5 ㎏ m2 / sec (E5) respectively.
Jeongho Yang,Dongseok Kang,Si Mo Yeon,Yong Son,Sang-Hu Park 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.5
The powder bed fusion (PBF) process using Ti–6Al–4V powder has the specific application in additive manufacturing of a high-performance structural parts in the aerospace and medical industries. The PBF involves the repeated accumulation of laser melted layers. Consequently, high anisotropic residual stresses and local temperature accumulation occur during the rapid melting and cooling in the process. These factors affect the mechanical properties of the as-built structure. In particular, we revealed the effective interval island laser-scanning strategy with less grain size, thermal effect and anisotropic residual stresses of the additively manufactured structure, compared to those of the strip and continuous laser-scanning strategies. Through the cantilever experiment, it was confirmed that the interval island laser-scanning strategy reduced deformation by up to 7.7% compared to that of the conventional strip laser-scanning strategy due to the reduction of anisotropic residual stresses.
( Hanbeol Jang ),( Ju Yeol Baek ),( Yong Mo Yang ),( Won Ik Lee ),( Seung-Woon Rha ),( Se Yeon Choi ),( Byoung Geol Choi ),( Jae Kyeong Byun ),( Hu Li ),( Jun Hyuk Kang ),( Eun Jin Park ),( Sung Hun P 대한내과학회 2016 대한내과학회 추계학술발표논문집 Vol.2016 No.1
Backgrounds:?Clinical impact of stabilized myocardial infarction (MI) following successful percutaneous coronary intervention (PCI) after 1 year is not clearly elucidated yet.?Methods:?We pooled 3,583 patients underwent PCI with drug-eluting stents (DESs). Of them, 658 was ST-elevation MI (STEMI), 632 non-ST segment elevation MI (NSTEMI), 1,297 unstable angina (UA), and 996 stable angina (SA). We compared 0-1 year and 1-5 years composite of cardiac death (CD) and MI among 4 groups.?Results:?With survival analysis of 0-1 year clinical follow up, a stepwise increase of the composite of CD and MI was observed in the transition from SA to STEMI. (SA; 1.2% vs. UA; 1.4% vs. NSTEMI; 5.2% vs. STEMI; 8.1%; Log-Rank <0.001). Even in the comparison of 1-5 year clinical outcomes between 4 groups, there was the same pattern of transition (SA; 1.7% vs. UA; 2.0% vs. NSTEMI; 3.9% vs. STEMI; 4.3%; Log-Rank=0.002, Figure). After Unadjusted cox-proportional analysis, STEMI and NSTEMI were independently associated with greater risk of 1-5 year CD or MI rather than SA (HR 2.70; 95% CI 1.361 to 5.364; p=0.004, HR 2.45; 95% CI 1.201 to 5.001; p=0.014), whereas UA were not significantly influential on CD or MI.?Conclusions:?Across the clinical spectrum of different coronary artery disease, STEMI and NSTEMI were associated with a greater risk of long-term CD or MI at 1 year. Even after stabilized by PCI in STEMI and NSTEMI patients beyond 1 year, the incidence of CD or MI was still higher than that of the patients with UA and SA