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인공해수 환경에서의 표면부식 및 전기방식이 X80 강재의 S-N 피로거동에 미치는 영향
권재기 ( Jae Ki Kwon ),안두홍 ( Doo Hong Ahn ),정대호 ( Dae Ho Jeong ),김영주 ( Young Ju Kim ),우남섭 ( Nam Sub Woo ),김상식 ( Sang Shik Kim ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.10
Abstract: The effects of pre-corrosion and applied potentials in artificial seawater on the S-N fatigue behavior of X80 steel were examined. The X80 specimens were pre-corroded in a FeCl3 solution for varying immersion times ranging from 0 to 96 h and subsequently S-N fatigued in air. It was found that the resistance to S-N fatigue decreased abruptly with 1 h immersion, while it became saturated with a further increase in immersion time. The trend observed in this study was relatively well explained by the stress concentration effect from the presence of corrosion damage on the surface. The in-situ S-N fatigue tests were also conducted on X80 steel in artificial seawater under applied potentials of .600, .850 and .1,050 mV (SCE). The fractographic and micrographic analyses were conducted on the fatigue specimens to identify the optimum cathodic protection conditions.
김범주 ( Boem Ju Kim ),김행미 ( Heng Mi Kim ),안두홍 ( Doo Hong Ahn ),이원정 ( Won Jung Lee ) 대한주산의학회 1990 大韓周産醫學會雜誌 Vol.1 No.1
Atrial natriuretic peptide(ANP) is a circulating hormone in the human fetus. Human fetus is able to increase ANP release in response to volume expansion and in direct proportion to heart rate. In this study, we attemped to determine the normal range of ANP in umbilical blood and to evaluate the clinical conditions in which the ANP levels may increase. ANP in the umbilical arterial and venous blood obtained at delivery were measured in 21 normal newborns. The ANP concentration in the umbilical arterial blood(mean ±SD, 19.77 ± 14.85 pg/dl) was significantly correlated with that in the umbilical venous blood(17.55 ± 13.70 pg/dl)(r=0.816). The plasma ANP concentration was not correlated with plasma creatine kinase(total, or MB fraction), maternal weight gain during pregnancy or change of hematocrit after birth. There was no difference of ANP concentration according to delivery method or presence of fetal distress. The ANP concentrations in the umbilical arterial, venous and maternal venous blood from mother suffering from pregnancy-induced hypertension were 34.5±15.0 pg/dl, 38.2±16.4 pg / dl and 71.3±37.1 pg/dl respectively. Each of them were significantly hihger than that from normal mother(15.0±11.6 pg/dl, 12.16±7.1 pg/dl and 30.8±18.7 pg/dl)(P<0.05). Our results suggest that cord blood ANP level is influenced by the maternal ANP level by placental transfer.
大邱地方에서의 Shigella 分離 및 其性狀 : 附:抗生劑 感受性檢査法의 比較 Including Comparative Results of Antiboitic Test
安斗洪,全薰基 中央醫學社 1962 中央醫學 Vol.3 No.3
44 strains of shigellae were isolated from 385 samples of suspected feces in Taegu area in 1961. Shigella strains were most frequently isolated in June and July. The isolated strains were classified as follows : Shigella dysenteriae 1 ……… 2 strains 2 ……… 1 3 ……… 1 Sh. flexneri 1b ……… 1 2a ……… 13 3a ……… 4 4a ……… 11 4b ……… 5 5 ……… 2 Sh. boydii 1 ……… 1 Sh. sonnei ……… 3 antibiotic sensitivity tests showed that steains sensitive to erythromycin were most predominant (30 strains) and the number decreased in order of chloremycetin (20), terraycin (16), streptomycin (14), penicillin (9) and aureomycin(2). Most strains were resistant to two or more drugs with most predominant numbers against 4 drugs (12). Comparative studies of tube dilution method and plate method for antibiotic sensitivity test were carried out with isolated shigella strains and found that the plate method was more sensitive that the tube method against penicillin, streptomycin and cholromycin, and the tube method was more sensitive showed paralleled results against aureomycin and terramycin.
安斗洪,金種煥,崔正憲,金永植 慶北大學校 醫科大學 1974 慶北醫大誌 Vol.15 No.2
Iron deficiency anemia among children is quite widespread in developing countries and most often occurs in children 6 months to 2 years of age. Iron deficiency has been implicated as a factor in increased susceptability to infection and retarded growth and development and has been associated with learning and emotional problems. The present studywas designed to determine the incidence of anemia in well babies (4 months to 18 months) registered in Daegu M.C.H. Center Well-Baby Clinic and compare two groups of anemic and non-anemic infants with their physical development. Hemoglobin was measured spectrophotometrically as cyanmethemoglobin method. Blood for hematocrit determination was collected in heparinized capillary tubes, spun on Clay-Adams autocrit centrifuge and calibrated on the Clay-Adams autocrit reader. The following results were obtained, Incidence of Anemia: When hemoglobin value ofless than 10.0gm% was considered to represent anemia in infants, the incidence of anemia in study group was 25.3%. (The incidence of anemia among breast feeding infants, bottle feeding infants and mixed feeding infants was 29.2%, 7.7% and 12.5% respectively) Physical Development: We selected weight and length gains as objective criteria of physical development. There were significant differences between non-anemic(Hemoglobin is above 10.8gm%)and anemic(Hemoglobin is below 10.0gm%) infants groups. The differences in weight 0.30~1.73㎏ in male infantsand 0.61~1.75 ㎏ in female infants in each age groups. The differences in length were 0.87~3.43㎝ in male infants and 0.90~3.58㎝ in female infants in each age groups. Their physical developments of weight and length of non-anemic infanes in this study were superior to those of Korean Standard growth data(1960~1965) and recent Japanese Standard growth data (1970)