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K. H. Kim(김기환),M. Y. Ha(하만영),S. H. Kim(김석호) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Recently, research has been conducted on a method of applying liquefied hydrogen to increase energy density in hydrogen mobility. In addition, a high-temperature superconducting motor (HTS motor) having a high current density can be applied using the liquefied hydrogen as a refrigerant. The system for circulating the refrigerant in the HTS magnet of the motor and transferring liquefied hydrogen to a fuel cell can be organized. Therefore, a pressure build-up (PBU) method can be used to transfer liquid by pressurize the liquid hydrogen tank using a heater installed in the tank. Since PBU method involves the evaporation and condensation at varying tank pressure, it is difficult to predict thermo-hydraulic behavior of a complex cryogenic system. In this study, a test apparatus was developed in which a small cryogenic fluid storage tank capable of PBU, a cooling reservoir, a dummy HTS magnet were configured through the flow paths. The cooling target temperature of the dummy HTS magnet was set and the thermal load was applied step by step. Then, the heater of the PBU tank was operated to verify the flow rate and cooling performance. Prior to the use of liquid hydrogen, liquid nitrogen was used instead.
김기환 ( K. H. Kim ),하태성 ( T. S. Ha ),서재성 ( J. S. Seo ),조명섭 ( M. S. Cho ),김주옥 ( J. W. Kim ),주경란 ( K. R. Joo ),최현경 ( Hyeun Gyong Choi ) 대한산부인과학회 1997 Obstetrics & Gynecology Science Vol.40 No.12
This study was undertaken for the clinical evaluation and statistical analysis on the patients with placenta previa who had been admitted and delivered at the Ulsan DongKang Hospital from Jan. 1, 1992 to Dec. 31, 1996. The results were summerized as follows. 1. The total incidence ofplacenta previa was 2.76 percent. 2. Placenta previa was found to occur most frequently in women aged 30 to 34(35.9 percent). 3. Placenta previa has occured more often in multipara(84.7 percent) than primipara(15.3 percent). 4. In the artificial abortion group and in primipara of the spontaneous abortion group, placenta previa has occured more often in women who had experienced abortion than women who hadn`t 5. In the first sign, vaginal bleeding(60.8 percent) was most frequent. The mean gestational age atthe first vaginal bleeding episode was 33.0 weeks. 6. The mode of delivery included 280 cases of cesarean section(93.0 percent), 12 cases of vaginal delivery(4.0 percent), and 9 cases of hysterotomy(3.0 percent). 7. The types of placenta previa distributed 106 cases of totalis(35.2 percent), 60 cases of partialis(19.9 percent), 92 cases of marginalis(30.6 percent), and 43 cases of low lying(14.3 percent). 8. The fetal presentation distributed 263 cases of vertex(87.4 percent), 27 cases of breech(9.0 percent), and 11 cases of transverse lie(3.6 percent). 9. The types of uterine incision included 180 cases of low segment transverse incision(64.3 percent), 43 cases of inverted T incision(15.4 percent), 36 cases of classical incision(12.8 percent), 21 cases of mid-transverse incision(7.5 percent). 10. Durig delivery, blood loss over 1,000 ml was 131 cases(43.5 percent). 11. There were 19 cases of hypogastric ligation(6.8 percent), 5 cases of cesarean hysterectomy(l.8 percent). 12. Premature infants delivered prior to completion of 37 weeks was 33.9 percent. Low birthweight infant less than 2,500gm was 22.6 percent. 13. Perinatal mortality rate was 76.4 per 1,000. 14. Maternal complications has been occured. They are 134 cases of anemia(44.5%), 19 cases of placenta accreta(6.3 percent), 11 cases of puerperal fever(3.7 percent), 11 cases of wound infection(3.7 percent), 8 cases of placenta abruption(2.7 percent), 2 cases of placenta increta. No maternal death occured.