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김승곤 전북대학교 공업기술연구소 1994 工學硏究 Vol.25 No.-
The result of eirect and indirect tensile strength experiment applide to gypsum and lime stone by changing the shpae at the displacement rate of 0.05cm/min, and 0.5cm/min is as follows; Supposing that the displacement rate were slow, the tensile strength of rock would be low and if it were fast, it would tend to be high. The tensile strength value, the experimental part in the shape of column, which is less influenced by the phenomena of a stress concentration is higher then that of notch which is influenced a lot by them. And the tensile strength, the experimental part in the shape of slender has a middle value between column and notch and the direct tensile strength value is similar to indirect tensile strength value. In the case of using the tensile strength value of rock when we make a blasting plan, if we use the tensile strength value found by direct tensile strength load which was at high speed to the experimental part in the shape of column, the plans with little probabilities of failure will be able to be made.
김승곤 전북대학교 공업기술연구소 1994 工學硏究 Vol.25 No.-
The result of direct and indirect tensile strength experiment applied to gypsum and lime stone by changing the shape at the displacement rate of 0.05cm/min is as follows: Both gypsum and lime stone showed higher direct tensile strength value than indrect tensile strength value. Direct tensile strength value the experimental part in the shape of column, which is less influenced by the phenomena of a stress concentration was the highest, and in the shape of notch greatly influneced by them was the lowest but it was almost similar to indrect tensile strength value. According to the difference of shape and method in experimental part, the tensile strength of rock will be different hence the internal friction angle and shear strength of value of rock will be changed. Consequently, in case that we produce the internal friction angle and shenar stenar strength value of rock, we must be careful about the shape and method in experimental part.
김승곤,양명환 濟州大學敎 體育科學硏究所 1995 체육과학연구 Vol.1 No.-
The purpose of this study was to determine the relationship of leisure activity types, leisure satisfaction and life satisfaction among college students. Specifically, two purposes were established for this study. The first purpose was to examine the effects of gender, age and types of leisure activity on leisure satisfaction and life satisfaction. The second purpose was to examine a casual relationship among types of leisure activity, leisure satisfaction, and life satisfaction. The subjects in this study were 115 male and 109 female college students. A purposive sampling method was used to select subjects who participated in three leisure activities including sport & exercise program(n=70,31.3%), hobby & creative activity(n=68, 30.4%),and amusement activity(n=86, 38.4%). Data were collected from all subjects during the fall of 1995. The Leisure Satisfaction Scale(Ragheb & Beard, 1980)was used to provide a measure of the extent to which individuals perceive that certain needs are met or satisfied through leisure activities. Life satisfaction was assessed by using a semantic differential technique. A 5 point Likert response scale was adopted for the instruments. One-way MANOVA, ANOVA and multiple regression analyses were used for research problems testing. MANOVAs indicated that gender, age, and leisure activity type had a significant effects on leisure satisfaction. Posttesting showed that male group perceived significantly higher in leisure satisfaction(psychological, educational, social, relaxational physio1ogical)than female group. The higher the age, the greater the leisure satisfaction(psychologica1, educational, social, relaxational physiological), and sport activity group perceived more leisure satisfaction (psychological, educational, social, relaxational, physiological, physical environment)than did the hobby & creative activity group and amusement group. ANOVA indicated that gender, age, leisure activity types had a significantly effects on life satisfaction. The male group perceived significantly higher in life satisfaction than female group. Scheffe multipe comparison indiacted that the higher the age, the greater the life satisfaction, and sport activity group perceived more life satisfaction than did the hobby & creative activity group and amusement group. Also multiple regression analysis and path analysis revealed that life satisfaction could be the best predicted from leisure satisfaction and could be affected through the sport activity indirectly. The findings provide significant casual relationships among leisure activity type, leisure satisfaction and life satisfaction in college students.