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朴鍾振 慶星大學校 1991 論文集 Vol.12 No.2
To study the forward and backward giant swings on the high bar, A top-class gymnast was used as the subject in the seoul olympic final individual competition. and his motion were filmed by a 16mm high speed camera at frame per second. I have reached following conclution by analyzing the film. For the backward giant swing ; In the first quadrant of movement the body is fully extended while it is hyperextened in the second quadrant. The body is extended again in the fourth quadrant. For the forward giant swing ; At the end of the first quadrant of the movement, the body is slightly hyperextened in order to support the subsequent leg swing. The flexion of the hips increases in the second quadrant, just before the start of the third quadrant while the velocity decreases again in the second half. After passing the horizontal line in the fourth quadrant, the arms exert a force pull on the bar, which provokes first an upward movement of the shoulders.
人工齒牙우식법을 利用한 數種 充塡材의 邊緣對鎖效果 比較
朴鍾振,趙圭澄 慶北大學校 齒科大學 1990 慶北齒大論文集 Vol.7 No.2
The purpose of the study was to compare the marginal sealing effect of amalgam, composite resin and glass ionomer cement restorations placed into cavity in root, by means of artificial caries technique The 100 extracted human 3rd molar teeth were selected, and simple cavities were prepared on root surfaces. The prepared cavities were filled with Optaloy Ⅱ, Optaloy Ⅱ-Vitrabond, Silux Plus, Silux Plus-Vitrabond and Ketac-Fil. All specimens were immersed in lactate buffer solution(pH 4.5) at 37℃ for 15 days. The 80㎛thick sections of restored teeth were prepared and examined under crossed polars of a polarizing microscope, and the depths of the demineralized lesions were measured by means of a calibrated eyepiece graticule. The results were as follows: The marginal leakage was the least in Ketac-Fil group(p<0.05) and there was no significant difference in marginal leakage between Optaloy Ⅱ group and Silux plus group(p>0.05). The marginal leakage was reduced with Vitrabond base in Silux Plus groups(p<0.05), but no significant difference in marginal leakage was observed between Optaloy Ⅱ groups(p>0.05).