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TiO<sub>2</sub> Ceramic Filler가 혼합된 젤상의 PAN 고분자 전해질을 이용한 리튬금속 이차전지의 특성
임효성,김형선,조병원,이태희,Lim, Hyo-Sung,Kim, Hyung-Sun,Cho, Byung-Won,Lee, Tae-Hee 한국전기화학회 2002 한국전기화학회지 Vol.5 No.3
Ethylene carbonate(EC), propylene carbonate(PC), dimethyl carbonate(DMC)의 가소제와 $LiPF_6$ 리튬염 및 $TiO_2$ 충진제를 이용하여 젤형 polyacrylonitrile(PAN) 전해질을 제조하였다. 고분자 전해질의 전기화학적 안정성, 이온전도도, 리튬전극과의 호환성 등의 전기화학적 특성과 기계적 특성을 조사하였다. 이러한 고분자 전해질을 이용하여 조립된 리튬이차전지의 충방전 특성을 조사하였다 EC, PC 혼합 가소제를 이용하여 제조된 고분자 전해질은 $TiO_2$가 첨가됨에 따라 고분자 전해질이 견딜 수 있는 최대 하중이 2배 가깝게 증가하였다. EC, PC혼합 가소제와 $TiO_2$가 혼합된 고분자 전해질은 상온에서 $2\times10^{-3}S/cm$의 이온전도도를 나타내었고, 4.5V까지 전기화학적으로 안정하였다. 리튬금속을 사용하여 제조된 셀의 임피던스 결과에서도 EC, PC 혼합 가소제와 $TiO_2$가 혼합된 고분자 전해질이 20일 동안 계면 저항 $130\Omega$으로 가장 안정하였다. $LiCoO_2$ 양극과 리튬 음극, $TiO_2$가 혼합된 고분자 전해질로 구성된 전지는 충방전효율이 1C 방전속도에서 $90\%$를 나타내었다. Gel-type polyacrylonitrile(PAN) polymer electrolytes have been prepared using ethylene carbonate(EC), propylene carbonate(PC) and dimethyl carbonate(DMC) plasticizer, $LiPF_6$ salt and $TiO_2$ ceramic filler. Electrochemical properties, such as electrochemical stability, ionic conductivity and compatibility with lithium metal and mechanical properly of polymer electrolytes were investigated. Charge/discharge performance of lithium secondary battery using these polymer electrolytes were investigated. The maximum load that the polymer electrolyte resists increased about two times as a result of adding $TiO_2$ in the polymer electrolyte containing EC and PC. Polymer electrolyte containing EC, PC and $TiO_2$ also showed ionic conductivity of $2\times10^{-3} S/cm$ at room temperature and electrochemical stability window up to 와 4.5V. Polymer electrolyte containing EC, PC, and $TiO_2$ showed the most stable interfacial resistance of $130\Omega$ during 20 days in the impedance spectra of the cells which were constructed by lithium metals as electrodes. Lithium metal secondary battery which employed $LiCoO_2$ cathode, lithium metal anode and $TiO_2$-dispersed polymer electrolyte showed $90\%$ of charge/discharge efficiency at the 1C rate of discharge.
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임효성(Lim, Hyo-Sung),김영숙(Kim, Young-Sook) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.4
This study is a single case study involving psychological training skills(below PST) performed by the researcher and coach to a single subject, a golf player attending K University. The present study was conducted in relation to two aspects of applying PST. First, there are restrictions to providing on-site intervention by sports psychologist, and second, it is difficult for coaches to conduct PST. Then, what would be an effective way for golf coaches on the forefront of field to conduct satisfactory PST? The present study, accordingly, aimed to verify the possibility of supervision as a way to supplement professionalism required for coaches to conduct PST. In this study, the coach as supervisee conducted PST under the supervision of an sports psychology expert as supervisor, who provided advice and assistance. The process of this study is presented in two parts, content of supervision and PST. A total of six sessions of PST were performed for this study, which consisted steps including baseline test, interview, implementation of PST program, post-test, and assessment. According to the before and after test results of the player"s level of psychological skills measured with TOPS(Test of Performance Strategies), there was no change in self-talk and tension relaxation, an increase in condition control, imagery, and goal setting, and some decrease in emotion control. In addition, the study indicated an increase in athletic performance as the subject player achieved the third place in the individual division and the first place in the team title at an international competition sponsored by the Asian University Sports Federation, as well as the first place in a individual competition sponsored by Korean College Golf Federation. The subject player also stated an improvement in his level of psychological skills in the subjective assessment conducted after the completion of all training sessions.
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유도선수의 지도자 신뢰와 운동행동의 관계: 지도자-선수 관계의 매개효과
남광우 ( Kwang Woo Nam ),임효성 ( Hyo Sung Lim ),최영준 ( Young Jun Choi ) 대한무도학회 2016 대한무도학회지 Vol.18 No.1
이 연구는 유도선수의 지도자 신뢰와 운동행동의 관계에서 지도자-선수 관계의 매개효과를 분석하는데 목적이 있었다. 이를 위하여 2015년 대한유도회에 등록된 중등학교 학생선수 281명을 대상으로 설문조사를 하였으며 총 258명의 자료가 실제분석에 사용되었다. SPSS 23.0 및 AMOS 23.0을 사용하여 빈도분석과 확인적 요인분석, 신뢰도 분석, 상관관계 분석, 구조방정식모형 분석 그리고 매개효과의 통계적 유의성을 검증하기 위하여 bootstrapping을 실시하였으며 이러한 분석과정을 통해 도출된 결과는 다음과 같았다. 첫째, 유도선수의 지도자 신뢰는 지도자-선수관계에 유의한 영향을 미치는 것으로 나타났다. 둘째, 유도선수의 지도자 신뢰는 운동행동에 유의한 영향을 미치지 않는 것으로 나타났다. 셋째, 유도선수가 인지한 지도자-선수 관계는 운동행동에 유의한 영향을 미치는 것으로 나타났다. 끝으로 유도선수의 지도자 신뢰와 운동행동의 관계에서 지도자-선수 관계는 매개(완전)역할을 하는 것으로 나타났다. The purpose of this study was to find out the mediating effect of coach-athlete relationship in relationship between trust of coach and sports behavior of Judo athletes. For this paper, the subjects surveyed were middle-high school judo athletes from registered in Korea Judo Association. A total of 281 surveys were sent out and 258 surveys were used for the final analysis. Frequency analysis, confirmatory factor analysis, reliability analysis, correlations analysis, and structural equation model analysis were executed using SPSS 23.0 Version and AMOS 23.0 programs. The results are as following. First, trust of coach was found to have an impact on coach-athlete relationship. Second, trust of coach was determined to not have an impact on sports behavior. Third, it was discovered that coach-athlete relationship have an impact on sports behavior. Finally, coach-athlete relationship was concluded to have a mediation effect on trust of coach and sports behavior.
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