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임신성고혈압 산모의 태반상 혈관변화와 도플러파형의 비교 연구
한창황(CH Han),성근환(KH Sung),강정배(JB Kang),남장현(JH Nam),이근영(KY Lee),강성원(SW Kang) 대한산부인과학회 1992 Obstetrics & Gynecology Science Vol.35 No.8
This study analyzed the subjects of 64 pregnant women of cesarean section performed for the period of amenorrhea 28 weeks and amenorrhea 42 weeks, at Hallym university Kang Nam Sacred Heart Hospital from May, 1988 through December, 1990. The 64 patients were studied who manifested 33 pregnancy induced hypertension and 31 normal term pregnancies. The uterine arcuate artery and umbilical artery blood flow velocity wave form examination were obtained all patients before cesarean section and placental bed biopsies obtained in all patients at cesarean section. The result of this study were as follows; 1. The association of physiological change of the spiral artery with uncomplicated pregnancy and their absence of pregnancy induced hypertension has been confirmed. 2. The physiological change of spiral artery of normal pregnancy shows low S/D ratio of fetal umbilical artery velocity (2.37±0.30) (Mean±S.D.), pathological invasion of spiral artery shows high S/D ratio of fetal umbilical artery (3.35±0.65)(Mean±S.D.) (P<0.01). 3. Physiological changes of spiral artery of normal pregnancy shows low R.I. of caternal uterine arcuate artery veolcity (0.46±0.08)(Mean±S.D.), pathological changes of spiral artery of pregnancy induced hypertension shows high R.I. of arcuate artery velocity (0.62±0.10)(Mean±S.D.)(P<0.001). These data indacate that abnormal doppler waveform in arcuate artery correlates pathologic invasion of spiral artery.
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굴 패각의 소성 조건에 따른 소석회의 특성과 외부용 수성 도료 적용 연구
황대주,유영환,한창수,이종대,Hwang, Dae Ju,Yu, Young Hwan,Han, Chang Soo,Lee, Jong Dae 한국화학공학회 2022 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.60 No.4
CaO was prepared by calcining for oyster shells using a microwave kiln. It was analyzed to Ca(OH)<sub>2</sub> synthed on hydration reaction from prepared CaO. The synthesized Ca(OH)<sub>2</sub> was formulated as an external water paint. Oyster shells (325 mesh, 43 ㎛) were decarbonized for (a) 950 ℃/1 hr and (b) 1,150 ℃/1 hr to prepare CaO. In the calcination condition of (a), CaO was 56.7 wt%, and in the calcination condition of (b), CaO was 100 wt%. To compare CaO by calcination of oyster shells with that of limestone, limestone (25~30 mm) was decarbonized at 950 ℃/1 hr to prepare CaO, and as a result of the analysis(XRD), it was analyzed as CaO 100 wt%. CaO was prepared under the calcining conditions of oyster shells (b) 1,150 ℃/1 hr, and Ca(OH)<sub>2</sub> was synthesized through hydration. Hydration conditions of the prepared CaO were (a) CaO : H<sub>2</sub>O(100 g : 200 g) and (b) CaO : H<sub>2</sub>O(100 g : 400 g). As a result of the hydration reaction, it was confirmed as low reactivity. 100 wt% of Ca(OH)<sub>2</sub> was synthesized. In particular, Ca(OH)<sub>2</sub> synthesized under the hydration condition of (a) was analyzed in a plate shape. An external water paint was formulated with Ca(OH)<sub>2</sub> synthesized from oyster shells as the main component. When 15 items of the external water paint standard specification (KS M 6010) were analyzed, it was confirmed that all other criteria were satisfied except for freezing stability.
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