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한필수(Han Pil-Soo),백은호(Baek Eun-Ho),장상영(Jang Sang-Yung) 한국체육과학회 2010 한국체육과학회지 Vol.19 No.2
The main purpose of this study is to develop items which can be written and approved by the meaningful acting result that players conduct in soccer play. At the present, the playing factors which can be recorded by playing contents of soccer player are about 13 items. In the result of analysis, in case of recording by using 13 playing factors, the meaningful playing contents can be recorded about 20%. So actually, about 80% of playing contents the player occurred has the result which is not exact for player appraisal because of the non-existence of item which can be recorded. That is to say, about 80% of meaningful playing contents was not recorded so player's playing ability is not appraised so it's to develop the method recording the player's playing contents concretely. Also, the created player appraisal item make to grasp the objectification and this result can be improved from subjective method to objective method by measuring the player's playing ability. The playing factors for measuring player are 4 fields(attack add, attack cut, defense add, defense cut) and by giving to each developed creating factor and suggesting the adapting principles, we let the result of inserting obtain the reliability. This study can reject the existed method recording the subject quantity mainly for the player's capability and consider to record the spontaneous situation both attack and defense by consisting comparatively the record items so that we can measure the plyer's actual ability. Especially, with just the record the player's playing ability, we generated and suggested the playing factor for our analysis. The playing factor generated newly is contrasting the attack add(26) recorded as positive contributing part when attacking, attack cut(20) recorded as negative failure in same situation, defense add(19) considering the positive results during the defense and defense cut(18) recorded as negative failure in same situation. In addition, by dividing the soccer court by each region, although recording the same factor of playing, we let the result value be appraised in quality.
석창성(Chang-Sung Seok),김형익(Hyung-Ick Kim),장필수(Pil-soo Chang),주재만(Jae-Man Joo),강정훈(Jeong-Hoon Kang) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Most of the fatigue test were achieved in fully reversed condition that mean stress is zero. But,<br/> generally, mean stress can not be zero. This research was achieved the bending fatigue test that<br/> changes mean stress to spring steel and was studied relation with the mean stress and the fatigue life.<br/> The method to search effect about mean stress was extended S-N graph in two cases. One method was<br/> extended S-N graph using modified Miner's rule with considering damage. Another was extended using<br/> tendency of S-N graph. The exponential value(α) of mean stress-alternating stress equation is<br/> converged between the Goodman's and the Gerber's value even if fatigue life increases.
반복충격에 의한 섬유강화 복합재료의 피로수명 특성 평가
최정훈(J. H. Choi),김형익(H. I. Kim),허용(Y. Huh),석창성(C. S. Seok),장필수(P. S. Chang),이창희(C. H. Lee) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
Generally, fiber-reinforced composites have the highest possibilities of impact damages with external object collisions. Also, resulting in fatigue fracture considering the continued impact load. For the reasons mentioned above, the accurate understanding of interactions between the impact of composites and the fatigue load will be essential to understand the safety level of material structures. Furthermore, the composite materials and structures, due to the geometrical effect, vary the life in connection with the impact-fatigue. Therefore, I have reached the point that a focus of this study will be to evaluate fatigue fracture characteristics by the impacts-fatigue load of fiber-reinforced composites. Thus, in this paper, I have tried to work on impacts-fatigue load causing aspects and impact characteristics through impact-fatigue test on HTV-5H1 Black 9250 material made- structure, along with to evaluate the expected life of real structures, the FEM analysis was carried out.