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정종원,박남국,박선정,박종래,김영철 全南大學校 觸媒硏究所 1997 觸媒硏究 論文集 Vol.19 No.-
The effects of polyols, isocyanates. surfactants and water on the physical properties of the polyurethane foam were investigated. The resin used in this study was prepared from a variety of polyol mixtures by adding catalyst, surfactant and cross-linker. The polyurethane was foamed from the resin by adding an equivalent amount of isocyanate and was used in property measurements. The physical properties were more affected by the type of isocyanates and the amount of water than the sound absorption coefficient. The sound absorption coefficient of the polyurethane foam was superior for the polyol mixture of KE-810(40%)FA-733(40%)/FA-703(20%). The sound absorption coefficient was increased with the amount of surfactant L-5309 up to 3000Hz, but was decreased above that frequency.
우리나라 一部地域에 있어서의 年齡別 死亡率 및 平均壽命에 關한 硏究
朴亭鍾,高應麟,李星熙 서울대학교 1964 서울대학교 論文集 Vol.15 No.-
A survey was carried out on 37,750 people (5,944 households) during the period from 21 July to the end of the month 1963 for the purpose of grasping the present status of mortality as well as expectation of life in Korea. This study covered the structure of population, age specific average death rate, mortality rate, number dying, number surviving and expectation of life, and the following conclusions were obtained. 1. Structure of population shows pyramid form in general. The proportions of he population under 14 years of age are 49.5% in male and 42.1% in female respectively. 2. Crude death rate is calculated as 11.1 in meal, 10.2 i female and 10.6 in the total. Age specific death rate is shown as table 3. 3. Infant mortality rate shows 68.4 in male and 66.8 in female per 1,000 live births. 4. Mortality curve shows that the higher rate is observed under 1 year of age and drops to the lower point at the age of around 10 years. The mortality goes up slowly again and makes rapid increase after the age of around 50 years. Male shows more higher rate than that of female in general. 5. Number dying is greater during the first year of life and drops to the lowest at the age of around 10 years. Rapid increase of the rate is observed at the age of around 40 years in male and 50 years in female. 6. Higher rate in the number surviving is observed in female than male though whole age group and the time of half surviving is seen during 60 to 70 years of age in both male and female. 7. Expectation of life at the age of 0 shows 57.59 years in male and 60.94 years in female.