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      • 디-젤 批塵用 移動벨트型 電氣集塵裝置의 小型化에 관한 硏究

        文在德,孫鉉,서보혁,金光錫 경북대학교 공과대학 1984 工大硏究誌 Vol.13 No.-

        A Moving-Belt Type Electrostatic Precipitator (MBEP) proposed by one of authers has been improved by introducing systematic control concept for the diesel soot particulates from diesel engine exhaust. The proto type MBEP was designed without helping of any precharger or precoagulator of the soot particles, and so it is too large for equipping to the vehicles. The improved one is designed as a systematic control device consisted of a precharger and a MBEP. This systematization makes it possible miniaturizing the size of MBEP without any drop of its collection performance by enhancing the corona field intensity and current density in the collection space concurrently obtained by reducing the interelectrode spacing of corona electrode to collection electrode. As a result, the collection efficiency of present MBEP system, which is reduced by ca. 1/2 in volume to the proto type MBEP, amounts to 82% at the gas velocity of 1.0m/s (this nearly equals to the gas exhaust of a 2000 cc diesel powered vehicle) and gas temperature of ca. 50℃ for the simulated soot particles ranged in size from 0.005μm (mass median diam is 1.0 μm). The collection efficiency of the improved MBEP system of 82% is higher enough to the US EPA regulation limit of 70% of the year of 1985 for the diesel powered light-duty trucks and passenger cars.

      • 우리 나라 都市와 農村地方의 母乳授乳 實態에 關한 調査硏究 : 全南地方을 中心으로

        文松洙,具光鍊,金成宜,韓圭炯,羅昌洙 朝鮮大學校 附設 醫學硏究所 1983 The Medical Journal of Chosun University Vol.8 No.1

        Human milk is the best source of nutrients for the human infant, and its nutritional and immunologic benefits are now established, In spite of these advantages, the incidence and duration of breast feeding- is decreasing in many part of the world. The purpose of the study is to collect the data on breast feeding practice in rural and urban area of Chullanamdo, Korea and to follow the trend toward breast feeding in fuutre. Between July 1981 and January 1982, 674 mothers with the children under 2 years of age have been interviewed at Out-Patient Department. The breast feeding situation at the time of interviewed was recorded. The percentage of wholly breast-fed in the age group of 0~1, 1-2, 2~3 ,3~4, 4~5, 5~6, 6-12 and 12~24 months were 61.8%, 50.0%, 51.6%, 65.2%, 50.0%, 45.7%, 23.0% and 17.3% respectively. And the percentage of partially breast-fed in the age group of 0~1, 1~2, 2~3, 3~4, 4~5, 5~6, 6~12, and 12~24 months were 29.4%, 33.3%, 25.8%, 17.4%, 34.2%, 39.1%, 8.6% and 80.0% respectively, In the incidence of wholly breast feeding, there was no correlation between deliveries in hospital and deliveries at home attended by midwives or traditional midwives. The most frequent reasons for partially breast-fed in the age group of 0~1, 1~2, 2~3, and 3~4 months were not enough breast milk.

      • 우리나라 中部 農村地域住民 死亡樣相에 關한 調査硏究

        文光錫,沈雲澤 충남대학교 의과대학 지역사회의학연구소 1986 충남의대잡지 Vol.13 No.1

        For the purpose of analizings the causes and the trends of deaths, and to know the actual states of death certification, we analyzed the records of total 10,415 deaths from 15 Myons of Chung cheong Province during past 10 years, from the January 1, 1975 to the December 31, 1984. Followings are the conclusions therfrom: 1. Of the total deaths, the rate of notification of death with medical certificate was 16.0%, and that with other certificate occupied 76.0%. The rate of notification of death with medical certificate was the highest in the plain area, but that with other's certificate was the highest in the seaside area. 2. 90.6% of deaths in hospital of clinic were reported with medical certificate, but 82.1% of home death was reported with other certificate. The rate of that reported with Medical Certificate become gradual increased in incidence with years. 3. 82.0% of total deaths were reported within one month, the rate become gradual increased in incidence with years. 4. Of the total deaths, below 10 years of age group occupied 8.1%, in the twenties the rates were 5 to 6%. After the forties the rate was increased by ageing, that is 10.2% in the forties, 18.5% to 13.1% in the fifties, 18.5% in the sixties and 32.5% in after the seventies age group, respectively. 5. The proportional mortality indicator was below 60 in time during 1975-1979, 62-63 in 1980-1982, but above 70 in 1983 and 1984. 6. The proportion of hospital or clinical deaths was slightly increased with 3.3% in 1975, 5.0% in 1980 and 6.6% in 1984. 7. Sex ratio of the deaths was higher in male children up to the sixties. Home deaths occupied 90.1% and hospital or clinic deaths occupied only 5.6%. 8. The proportion of deaths was higher, but lower in Summer in seasonal difference. The rate of below thirties was high in Spring and Summer, but the rate of over fifties was high in Autumn and Winter. 9. In the past 10 years from 1975 to 1984, the main causes of death were of Unknown cause, Disease of circulatory system, Symptoms·signs and ill-difind conditions, Neoplasms, and Injuly and poisoning in that order. But those that were of Unknown cause, Disease of circulatory system, Symptoms·signs and ill-defined conditions, Neoplasms, Injury and poisoning, Disease of digestive system, Infection and parasitic disease in that order in 1975-1979, and Unknown cause, Disease of circulatory systems, Symptoms·signs and ill-defined conditions, Injury and poisoning, Neoplasms, Disease of circulatory system and Infection and parasitic disease, in that order in the year 1980-1984. 10. The rate that we could have analized the cause of death was 87.1% only by the Medical Certificate, but the rate of that was 55.3% by the Medical Certificate and Neighbour's Certificate. 11. The cause of death in male were Unknown and others, Disease of the circulatory system, Symptoms·signs and ill-defined conditions, Injury and poisoning, in that order, but those in female were Unknown and others, symptoms·signs and ill-difined conditions, Disease of circulatory system, Neoplasms, Injury and poisoning, in that order. 12. For age specific causes of death, the highest rate was Unknown and others in all age group, without that the main causes were Disease of respiratory system, Infection and parasites, Injury and poisoning, Disease of nervous system and sense organ in the below ten age group; Injury and poisoning, Infection and parasites, Neoplasms, and Disease of the respiratory system in tens and thirties age group; Disease of the respiratory system, Disease of the digestive system, and Infection and poisoning fifties group, but Disease of the respiratory system, Symptoms·signs and ill-defined conditions, Neoplasms, and Disease of the digestive system in after sixties age group, respectively. 13. The frequent causes of death were different by the season, mainly, Unknown and others, Disease of the circulatory system, Symptoms·signs and ill-defined conditions, Injury and poisoning, and Neoplasems in that order in Autumn; but Unknown and others, Disease of the circulatory systems, Symptoms·sign and ill-defined conditions, Neoplasms and Injury and poisoning in that order in other seasons.

      • 長方形 容器內에서 磁性流體의 流動特性에 관한 硏究

        문종춘,조광현,서이수 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.1

        The present paper describes sloshing phenomena of the magnetic fluid flow in rectangular tank which is horizontally oscillated under non-uniform magnetic fields. In theoretical analysis, the desision of potential function obtained by assuming that linear to be non-linear boundary condition. The obtained results from experiment and theoretical analysis are as follows : The resonant frequency of fluid and magentic fluid based on a potential theory are in good agreement qualitatively with that of experimental results. It is found that resonant frequency depends on the magnetic intensity and moves into high frequency region. Pressure and velocity increase by non-linear with increasing wave heights and linearly increase with increasing magneitc force.

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