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姜相兆,尹喜重,鄭樂喜,金奎完 韓國體育大學校附屬 體育科學硏究所 1984 韓國體育大學校附屬 體育科學硏究所論文集 Vol.3 No.1
The purpose of the study was to investigate the effects of different stances, cardiac cycles, breathing patterns, and body sway on performance in archery. It was hypothesized that subjects demonstrate different performances in archery relative to different stances, distances, cardiac cycles, breading patterns, and the body sway while in release position. 10 varsity caliber archery were randomly selected from archer groups of Korean National College of Physical Education and National representatives. The independent variables were body sway, breathing patterns, cardiac cycles for different stances and distances with testing order assigned in a counterbalanced manner for each subjects. The dependent variable was score upon release of the 9 arrows. Hypothesis were tested at the .05 level of significance. The study design was a 2-way(stance X distance)factorial ANOVA with repeated measures on assigned factors. The levels of assigned factors were. open, square, and close stance;30, 50 and 70 meters. The data were analyzed using ANOVA and multiple regression. The results were summarized as follows; 1. The performance in archery was not effected by stances, cardiac cycles, breading patterns, but effected by distances. 2. In general, the performance in archery was not effected by cardiac cycles, but there was significant individual differences between cardiac cycles and the performance in archery. 3. The performance in archery was not effected by breading patterns, but most of subjects accustomed to breading pattern 4 and 5 than others. 4. There were individual differences in breading patterns and all of the archers did not have their own fixed breading pattern. 5. The body sway was effected in accordance with change of the distance. 6. The performance in archery was not effected by body sway with different distances.
김규완,Nguyen Ba Chien,최광일,오종택 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.10
We report experimental data of boiling heat transfer of R-1234yf in horizontal small tubes. The experimental data obtained in the horizontalcircular small tubes of 1.5 and 3.0 mm inner diameter, the lengths of 1000 and 2000 mm, the mass flux range from 200 - 650kg/m2s, the heat flux range from 5-40 kW/m2 and saturation temperature of 10 and 15ºC, was used to develop a modified correlation forthe heat transfer coefficient. The flow pattern of the experimental data was mapped and analyzed with existing flow pattern maps. Theheat transfer coefficient was also compared with some well-known correlations.