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김철하 한국전기기술인협회 2001 電力技術人 Vol.228 No.8
펌프는 유체를 이송하는 설비로써 모든 산업설비와 건물에 까지 광범위하게 이용되고 있으며 설계, 제작, 설치시 과대한 여유물을 적용시켜 운용하고 있어 효율적인 운전이 이루어지지 못하고 있는 사례가 많으나 단순 공급, 이송만 하면 된다는 사고로 운전하고 있어 펌프의 합리적 운전에 필요한 기술 및 점검 사항을 제시 하고자 한다.
특집 - 저소득층의 주택문제 : 서울.목동 신시가지 개발사업 현황
김철하 대한건축학회 1987 建築 Vol.31 No.4
총면적 627㎢내에 950만명의 상주인구를 갖고 있는 서울시의 인구빈도는 평방킬로미터당 만 5천여명으로서 우리나라 평균인구빈도 416명보다 무려 36위를 넘고 있는 실정이다. 이와같은 인구과잉현상은 필연적으로 주거문제, 교통문제, 공해문제등과 같은 사회문제를 야기하게 되었으며 이는 서울시가 해결하여야 할 시급한 당면과제로 대두되었다. 따라서 시에서는 83년 4월부터 목동, 신사동 일대에 신시가지 개발여건을 검토하여 84년 3월에 기본계획을 확정한 후, 착공함으로써 200만 서부서울의 중심지역에 대생활권을 형성하여 침체된 이 지역의 발전을 기하고 인구를 분산 수용할뿐만 아니라 주거난을 완화시키는 한편 주거가격의 안정을 기도하게 되었다.
여중학생의 풍진 바이러스 및 거대세포 바이러스에 대한 항체보유율 : A Preliminary Study
김철하,심태섭 중앙대학교 의과대학 의과학연구소 1982 中央醫大誌 Vol.7 No.3
Infections with rubella and cytomegalovirus occur world-widely and are the commonest causes of prenatal infections accompained after with a severe consequence. Hence, in female just before child-bearing age the determination of antibodies aganist these virus is important. There is a great need for a simple assay which can be carried out on a large scale for the detection of rubella and cytomegalovirus antibodies, since the existing methods such as complement fixation test andmany manipulations of the sera. In recent years the enzyme linked immunosorbent assay(ELISA)thchnique has come into use in virus serology. The ELISA test showed the following advantages: there are no disturbances caused either anticomplementary properties of the serum or by non specific inhibitors, as is the case with thw complement fixation test and hemagglutination test. The sera require no pretreatment, and the isage of equipments available for the microtiter technique makes it possible to carry out the test quickly and economocally. This was a preliminary study to evaluate the immune status of female just before childbearing age in Korea. The samples were taken from 46 females, aged 12 to 13 years, on March, 1982 at Chong-Am junior high school located in Seoul. Detection of antibodies to rubella and cytomegalovirus were conducted by ELISA and then immune status was analyzed. The results of this are summarized as follows. 1. Antibody against rubella virus was found in 76.1% of schoolgirls tested. 2. Antibody against cytomegalovirus was found in 65.2% of schoolgirls tested. 3. Antibody against both viruses was found in 47.8% of schoolgirls tested. 4. Of schoolgirls tested 6.5% possessed neither rubella nor cytomegalovirus antibodies.
Etretinate(RO 10-9359)투여로 유도되는 口蓋裂 발생 과정과 턱, 혀 및 口蓋形成간의 상관관계에 관한 실험적 연구
金喆河,全容赫 고려대학교 의과대학 1990 고려대 의대 잡지 Vol.27 No.1
Etretinate (retinoic acid ethyl ester, Tigason), an analog of vitamin A and used in the treatment of severe psoriasis, has proved to be a horrible teratogen in human as well as in experimental animals. To extend our understanding about the mechanism of teratogenic actions of the drug especially on palatogenesis, the status and morphology of the palatal shelves during the process of the drug-induced cleft palate and size of mandible and tongue relative to palate closure, following single intragastric dose of etretinate in DDY mice on day 13 of gestation, were investigated. The incidence of cleft palate due to the drug was increased as a dose-dependent manner and the drug did not affect on the formation of palatal shelf and its growth but it delayed or inhibited the second step in palatogenetic process, that is, shelf elevation. The mandible and tongue grew longer at a same pace each other during the period of palatogenesis, even the tongue was always slightly shorter than the other, but after completion of the palate, growth of tongue did not keep pace with that of mandible ; On the other hand, the etretinate inhibited the growth of mandible in preference to the tongue which resulted in micrognathia with reversed in size or ratio between tongue and mandible that made tongue into dome. With the results, it seems that etretinate-induced cleft palate is closely related to the difficulty in descent of tongue owing to the relatively smaller oronasal cavity resulted from micrognathia with normal sized tongue, with consequent interference of shelf elevation. These observations also suggest that tongue obstruction during palatogenesis is one of the pathogenetic mechanism of cleft palate.