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신뢰성 제약 조건식을 고려한 철근콘크리트 구조물의 최적화에 관한 연구
최병한,성배경,이규원,고성곤 전북대학교 공업기술연구소 2000 工學硏究 Vol.31 No.-
This study is the formulation of optimum design for reinforced concrete structures with reliability constraints based on the ultimate strength design method. The purpose of this study is to look into the possibility of the detailed and practical optimum design of the reinforced concrete structures. In this study, total cost has been used as the objective function. For the more useful and adoptive to the practical design, the design variables are the overall depth, width, effective depth of members, and area of longitudinal reinforcement. In addition, the details such as the amount of reinforcement and cutoff points of longitudinal reinforcement are also considered as variables. The constraints include the code requirements like the flexural strength, shear strength, ductility, serviceability, concrete cover, spacing, web reinforcement, development length and cutoff points of longitudinal reinforcement. The optimization algorithm is presented for the effective optimum design of the R.C structures considered the reliability theory and optimization is accomplished by using the Feasible Direction Method. The proposed algorithm was applied to the test problem for reliability, and the results were compared with those of others to examine it's applicability and stability.
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崔秉韓 고려대학교 의과대학 1977 고려대 의대 잡지 Vol.14 No.1
The chance of survival for the infant of a diabetic mother is now a very good one, but the surviving newborn infant is at risk during the first week of life. They are subject to hypoglycemia, acidosis, hypocalcemia, respiratory distress syndrome, and hyperbilirubinemia, and the chance of a congenital abnormality is increased. At birth the baby is likely to be larger and heavier than the length of gestation period would suggest, and it may even be possible to diagnose the prediabetic state in mother who have born infants of successively increasing birthweight. Glycosuria is a one of the indicative finding of diabetes mellitus, but many healthy women show positive glycosuria during the pregnancy. It order to determine the relation between the birth weight of infants and maternal glycosuma, 229 newborn infants born from mother with glycosuria during the period of Jan. 1, 1974 to June 30, 1976. The results obtained were as follows: 1. The incidence of positive glycosuria in 1686 pregnant women was 13.6%. 2. Mean weight of infants born from mother with glycosuria were 3.20±0.10㎏ in male, 3.07±0.03㎏ in female at birth. 3. There was no significant difference in the birth weight with degree of maternal glycosuria or mode of delivery. 4. The highest birth weight noted in the infant born after 42 weeks of gestational age from glycosuria. 5. Infants born from multipara with glycosuria weighed heavier than that of babies from primipara at birth, but there were no close relation between birth weight and parity or maternal age. 6. Intrauterine fetal death rate was slightly higher in infant born from mother with glycosuria, but there was no evidence of positive correlation between baby's condition (estimated by Apgar score) with materal glycosuria. 7. Overall incidence of maternal toxemia was 13.6% and slightly higher in mother without glycosuria than with glycosuria.
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崔秉韓,崔平和 고려대학교 의과대학 1981 고려대 의대 잡지 Vol.18 No.3
Although the physician has attempted to understand the relationship of yellow jaundice to newborn infants for a long time, and new questions about old data which force us to recognize and reevalute our understanding of hyperbilirubinemia, the, the development of kernicterus, and therapies utilize. Factors that must be considered are the physiologic mechanism by which bilirubin is catabolized and excreted; the physiologic and pathologic factors that affect the catabolism and distribution of bilirubin, the mechanism by which central nervous system bilirubin toxicity occurs that is, bilirubin encephalopathy and kernicterus. Present study was carried out to determined the factor which influenced to increased the serum bilirubin level in both full term and pre-term infants. Of 376 newborn infants in Korea University Hospital in the period of ten months from March 1 to December 30, 1980. 304 full term newborn infants and 72 preterm infants were available for the study of serum bilirubin level at the third and sixth dayof the birth. The following are results analized: 1. The mean value of serum bilirubin level estimated was 10.6 mg%, The incidence of neonatal jaundice was estimated as 95.4%. 2. The premature infants revaled are marked elevation of serum bilirubin level. Condition with increased level of serum bilirubin in variable degree include vaccum extraction and/or forcep delivery, high or low hematocrit value, low Apgar score, artificial resuscitation, cephalhematoma, and spontaneous premature rupture of the membrane. 3. There were no relationship in serum bilirubin levels between differences in sex, birth weight, number of pregnancies and ABO blood group of mother and infant. 4. In prematurity, there were no significant difference in birth weight, gestational age, sex, Apgar score, incidence of hypoglycemia, hypothermia, convulsion, anemia and infection between hyperbilirubinemic infants and non-hyperbilirubinemic infants. Serum albumin value were significantlylower, and acidosis were seen more often in hyperbilirubinemic infants than in non.
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