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온도변화에 따른 탄소부직포 삽입 복합적층판의 층간 파괴인성
조병진(Byung Jin Cho),이승환(Seung Hwan Lee),정성균(Seong Kyun Cheong) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Interlaminar fracture toughness of composite laminates with carbon non-woven tissue was evaluated under various temperatures in this study. Specimens were made by inserting carbon non-woven tissue between carbon prepreg layers and cured under the curing cycle. Four types of specimens were prepared for evaluating Mode Ⅰ and Mode Ⅱ interlaminar fracture toughness. Double-cantilever-beam (DCB) and end-notched-flexure (ENF) tests were performed in the high temperature chamber. Experimental results show that the mode Ⅰ interlaminar fracture toughness of composite laminates with carbon non-woven tissue increases about twice by changing room temperature to 80℃. But the mode Ⅱ interlaminar fracture toughness of composite laminates with carbon non-woven tissue shows small change changing room temperature to 80℃.
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놀이 프로그램이 발달지체 유아의 사회성 발달에 미치는 효과
조인수(Cho In-Soo),조병균(Cho Byung Kyun) 한국재활심리학회 2006 재활심리연구 Vol.13 No.1
발달 지체 유아는 인지, 사회, 정서, 언어, 운동 영역에서 지체되어 있다. 특히 사회성 영역에서 많이 지체된 것으로 알려져 있다. 그리고 놀이는 발달 지체 유아 및 발달 지체가 없는 유아의 학습과 발달 및 사회성 발달에 많은 영향을 미치므로 발달지체 유아의 중재 방법으로 놀이가 중심적 교육과정이 되는 것은 당연하다. 놀이 프로그램은 발달지체 유아의 사회성 발달에 많은 영향을 미쳤다. 특히 사회화 능력과 의사소통 영역에 많은 효과가 있는 것이 밝혀졌다. 따라서 사회성 발달에 지체된 발달지체 유아의 중재 접근으로 놀이 프로그램이 효과적이다. The purpose of this study was to examine whether developmental delayed infant were influenced by the play program. The subjects of this study were three children in the clinic located in the city of Masan. The program of play was bassed on the list of Lee, sook jae s playing house, and the contents that were easily applicable to surroundings were chosen by the researcher of this study. Test instrument was social development test developed by the Kim, seung kook and Kim, ok kee in 1987. Social quotients and means were compaired among the three children. The results of this study were as follows; 1. In the difference of social development, the children s social quotient was considerably changed after the execution of play program. It was showed that play program was positively effect on the social development of developmental delayed infant. 2. Compared to the means of the six subordinate field of the sociality for three children, social skill was changed the most. Then came communication skill, self-helf skill, locomotion skill, work skill, self-control skill in that order. Especially, Self-control skill was not much changed and the reason seemed that the parents took too much care of developmental delayed infant. 3. In the change of social field for every child, Chesu, Kim was changed the most in communication skill, and then social skill. Ngaengsu, Kim and Chelngaeng, Kim were changed the most in social skill, and then communication skill.
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상온 및 고온환경에서 단조강의 피로수명 향상을 위한 최적피닝강도 탐색
조병진,김태형,정성균 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
Fatigue Characteristics of shot peened SF50A was investigated in this paper. Optimum-peening intensity was examined and fatigue test was accomplished under room and high temperature environment. The fatigue test was performed by rotary bending fatigue machine, and applied stress was 358MPa. Experimental results show that the optimum-peening intensity is 0.35mmA~0.41mmA at room temperature. The fatigue life of SF50A specimens under the room temperature was increased about 42% by shot peening. The fatigue strength of shot peened and unpeened specimens was greatly reduced under the high temperature condition.
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