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2019 기계체조 세계선수권대회 도마운동의 연기내용과 착지 성공률 및 키워드 네트워크 분석
한윤수,Tsuchiya Jun 한국체육과학회 2020 한국체육과학회지 Vol.29 No.3
On vault in artistic gymnastics, landing is thought to be important when performing difficult vaults. To identify this assumption, we analysed the exercise contents, success rate of landing and keyword network in the men's vault final at the World Championships in 2019(n=8). Two gymnasts performed the highest difficulties(D-score=6.0) of Re Se Gwang 1, 2 and Yang hak seon. On the other hand, the gymnasts received higher deductions than other gymnasts because of landing fall mistake. Although they performed high difficulty vault, they had fall error(above 1.0 point) performing landing. 61% of vault landing were performed moving forward. This study confirmed that successful landing is one of the most important determining final score on vault in men's gymnastics competition. Particularly, Yang Hak seon thought that main key words are feeling, moment, kick off, mental in vault competition regarding landing mistake. This information is important for coaches and gymnasts when performing a competition vault.
2020 도쿄올림픽대회 남자 도마 종목 연기내용 분석 : 신재환선수 금메달 획득원인과 보완방안
한윤수(Han, Yoon-Soo),Tsuchiya Jun 한국체육과학회 2021 한국체육과학회지 Vol.30 No.5
The purpose of this study was to analyze the exercise contents at men’s vault final at the 2020 Tokyo Olympics Games in 2021. All vault exercises(n=16) performed by 8 gymnasts were examined using video analysis by international judges. Gymnasts’s scores(difficulty, execution and final scores)and landing errors were defined as variables. Two gymnasts performed 6.0 difficulties of Yonekura(KOR) and Re Se Gwang 2(TUR). The success and errors rate for landing has affected final score and ranking. We also found that no one(16 vault exercises) has succeeded in landing phase. The overall average deduction are 1.156 points, 0.406 points for landing, 0.250 points for the 2nd flight, and 0.175 points for preflight. For Shin Jae-hwan to maintain his world ranking in men’s vault exercise, the penalty in the Yonekura element for legs separation of 0.3 during the first flight and the handstand position must be reduced. Also, we suggest that he must focus on preparation for landing and stick landing with complete twist. In addition, in the Yeo2 element, it is necessary to focus on improving hip straight during flight phase and increasing landing success rate.
Ishiki, Goro,Kim, Sang-Woo,Nishimura, Jun,Tsuchiya, Asato American Physical Society 2009 Physical review letters Vol.102 No.11
<P>We test the recent claim that supersymmetric matrix quantum mechanics with mass deformation preserving maximal supersymmetry can be used to study N=4 super Yang-Mills theory on R x S{3} in the planar limit. When the mass parameter is large, we can integrate out all of the massive fluctuations around a particular classical solution, which corresponds to R x S{3}. The resulting effective theory for the gauge field moduli at finite temperature reproduces the deconfinement phase transition in N=4 super Yang-Mills theory on R x S{3} at weak coupling. This transition was speculated to be a continuation of the conjectured phase transition at strong coupling, which corresponds to the Hawking-Page transition based on the gauge-gravity duality. At strong coupling, one can study the target theory by the new simulation method for supersymmetric matrix quantum mechanics.</P>
Solvate Ionic Liquid Electrolyte for Li–S Batteries
Dokko, Kaoru,Tachikawa, Naoki,Yamauchi, Kento,Tsuchiya, Mizuho,Yamazaki, Azusa,Takashima, Eriko,Park, Jun-Woo,Ueno, Kazuhide,Seki, Shiro,Serizawa, Nobuyuki,Watanabe, Masayoshi The Electrochemical Society 2013 Journal of the Electrochemical Society Vol.160 No.8
<P>Innovation in the design of electrolyte materials is crucial for realizing next-generation electrochemical energy storage devices such as Li–S batteries. The theoretical capacity of the S cathode is 10 times higher than that of conventional cathode materials used in current Li–ion batteries. However, Li–S batteries suffer from the dissolution of lithium polysulfides, which are formed by the redox reaction at the S cathode. Herein, we present simple solvate ionic liquids, glyme–Li salt molten complexes, as excellent electrolyte candidates because they greatly suppress the dissolution of lithium polysulfides. The molten complexes do not readily dissolve other ionic solutes, which leads to the stable operation of the Li–S battery over more than 400 cycles with discharge capacities higher than 700 mAh g-sulfur<SUP>−1</SUP> and with coulombic efficiencies higher than 98% throughout the cycles. Such high performance has not been realized to the best of our knowledge. Furthermore, the addition of a nonflammable fluorinated solvent, which does not break the solvate structure of the glyme–Li salt molten complexes, greatly enhances the power density of the Li–S battery. The strategic design of electrolyte properties provides opportunities for the development of new electrochemical devices with many different electrode materials.</P>