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고강도 구조용 철강소재의 대입열 용접 시 열영향부의 조직 미세화 및 기계적 특성 향상에 미치는 TiN 및 B의 효과
박진성,황중기,조재영,한일욱,이만재,김성진,Park, Jin-seong,Hwang, Joong-Ki,Cho, Jae Young,Han, Il Wook,Lee, Man Jae,Kim, Sung Jin 한국재료학회 2019 한국재료학회지 Vol.29 No.2
In the current steel structures of high-rise buildings, high heat input welding techniques are used to improve productivity in the construction industry. Under the high heat input welding, however, the microstructures of the weld metal (WM) and heat-affected zone (HAZ) coarsen, resulting in the deterioration of impact toughness. This study focuses mainly on the effects of fine TiN precipitates dispersed in steel plates and B addition in welding materials on grain refinement of the HAZ microstructure under submerged arc welding (SAW) with a high heat input of 200 kJ/cm. The study reveals that, different from that in conventional steel, the ${\gamma}$ grain coarsening is notably retarded in the coarse grain HAZ (CGHAZ) of a newly developed steel with TiN precipitates below 70 nm in size even under the high heat input welding, and the refinement of HAZ microstructure is confirmed to have improved impact toughness. Furthermore, energy dispersive spectroscopy (EDS) and secondary-ion mass spectrometry (SIMS) analyses demonstrate that B is was identified at the interface of TiN in CGHAZ. It is likely that B atoms in the WM are diffused to CGHAZ and are segregated at the outer part of undissolved TiN, which contributes partly to a further grain refinement, and consequently, improved mechanical properties are achieved.
여성 피트니스 참여자의 운동열정과 운동몰입 및 운동만족과의 관계
박진성,문한식 한국엔터테인먼트산업학회 2019 한국엔터테인먼트산업학회논문지 Vol.13 No.7
The purpose of this study was to examine how the fitness participation was influenced on exercise enthusiasm, exercise commitment and exercise satisfaction by female fitness participants, Subjects were selected among the female fitness center users living in Sunchon, Yeosu, Gwangyang. A total of 223 questionnaires were used in the actual analysis via convenience sampling method out of 250 questionnaires. Data analysis wad processed by SPSS 25.0 program with frequency analysis, exploratory factor analysis, reliability analysis, correlation analysis and multiple regression analysis and the following results were made. First, as a result of analyzing the effects of exercise enthusiasm on exercise commitment, it was found that harmony enthusiasm had positive (+) influence on cognitive commitment and behavioral commitment. Second, as a result of analyzing the effects of exercise enthusiasm on exercise satisfaction, it was found that harmony enthusiasm had positive (+) influence on exercise ability improvement, social relationship promotion and psychological benefits, and harmony enthusiasm and compulsive enthusiasm had positive (+) influence on physical function improvement. Third, as a result of analyzing the effects of commitment on exercise satisfaction, it was found that behavioral commitment had positive (+) influence on exercise ability improvement, physical function improvement and social relationship promotion and harmony enthusiasm and compulsive enthusiasm had positive(+) influence on psychological benefits.
박진성,박형준 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.3
This study was intended to systematically understand relevant variables among demo-sociology and sport-related ones of regular participants in the activities of sport for all, which particularly had significant effects on mental health, and further provide useful data for positive environment setting which was to help elevate the participants' mental health level. For this purpose, a total of 543 adults, male and female, was chosen to inquire into the ten factors and the causal relation in regard to mental health. The results are as follows: 1. Demo-sociological variables In regard to demo-sociological variables that help improve the participants' mental health level, gender, age, religion and residential environment factors proved of significant effects, while as another environment factors favorable for upgrading mental health level it could be generalized that man was more relevant than women, followed by the middle-aged and more than the young, small towns than big cities, and the religious than the atheists. 2. Sport-related variables In regard to sport-related variables which are helpful for upgrading the participants' mental health level, some variables classified by participation motives, forms, and careers, and the strength of activity had more significant effects, while the purpose of leisure activity rather than therapeutic purpose, free or of form of lover's society participation rather than scheduled lessons, high participation career rather than low career, and normal strength of activity rather than strong or weak in extreme can be generalized as positive environment variables favorable for upgrading mental health level.