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- 저자 : 신정환 ( J. H. Shin ) (검색결과 3 건)
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자동차 헤드램프 세척용 재순환 챔버 노즐의 내부유동이 분무장에 미치는 영향
신정환 ( J. H. Shin ),이인철 ( I. C. Lee ),강영수 ( Y. S. Kang ),김종현 ( J. H. Kim ),구자삼 ( J. S. Koo ),구자예 ( J. Y. Koo ) 한국분무공학회 2011 한국액체미립화학회지 Vol.16 No.2
Atomized liquid jets from the washing nozzle which configured with recirculation chamber for cleaning hot-zone area are accelerated and impinged on the head lamp surface. Cleaning efficiency of head lamp can be increased with injecting washing fluids into the hot-zone area. Experimental and numerical studies with various design parameters were executed to reveal the relations between internal geometry and internal flow in the washing nozzle. Spray structures were fitted with each of the head lamp surfaces and spray nozzles were optimized to the spray pattern. The recirculation chamber induces a recirculation flow and can be decreased the pressures perturbation inside the chamber. Orifice determines the mass flow rate. When the diameter of orifice is excessively large, it showed an unstable spray pattern. As a nozzle exit angle increases, density distributions are separated with two section. Also, as a protrusion length of nozzle exit increases, spray patterns are spread into a large area and density distributions showed unstable trend.
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김대영(D . Y . Kim),정수미(S . M . Chung),송지훈(C . H . Song),정환부(H . B . Chung),신정환(J . H . Shin),홍서유(S . Y . Hong),손동우(D . W . Son) 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.12
N/A Prostaglandin E2 is capable of ripening the unfavourable cervix and thus improving the outcome of induced labor by altering the state of the cervix and myometrial fibers of the lower uterine segment. This study was performed to compare the clinical efficiency of PGE and oxytocin for the elective induction in term pregancies. A retrospective randomized study was undertaken comparing the efficacy of a 3mg prostaglandin E2 vaginal suppository (group 1, n 80), intravenous oxytocin (group 2, n=72), and prostaglandin E plus intravenous oxytocin (group 3, n 74) for the elective induction of labor. The results of above three groups were also compared with normal spontaneous labor group (control group, n 75) as a control. Gestational age of every subject was between 38 and 42 weeks with Bishops score from 1 to 6. The duration of 1st stage, cesarean section rate, Apgar score, incidence of neonatal complication, and side effect of every group were evaluated. The results were as follows; 1. In nulliparous women with Bishops score of 4 or less, the duration of the first stage of labor was significantly shortened in the group 1, 2, and 3 compared with that of control group. (P<0.0001, respectively) The duration was significantly shortened in the group 3 compared with group 1 or 2 (P<0.0001, respectively) while the difference was not found between group 1 and 2. (P>0.05) 2. In parous women with Bishops score of 4 or less, the duration of the first stage of labor was significantly shortened in the group 1, 2, and 3 compared with that of control group. (P<0.0001, respectively) No difference was found among group 1, 2, and 3. (P>0.05, respectively) 3. In nulliparous women with Bishops score of 5 or more, the duration of the first stage of labor was significantly shortened in the group I, 2, and 3 compared with that of control group. (P<0.0001, respectively) The duration was significantly shortened in the group 3 compared with group 1 or 2 (P<0.0001, respectively) while the difference was not found between group 1 and 2. (P>0.05).4. In parous women with Bishops score of 5 or more, the duration of the first stage of labor was significantly shortened in the group 2 and 3 compared with that of control. (P<0.0001, respectively) No difference was found between group 1 and control group (P>0.05) and no difference were found among group 1, 2 and 3 (P>0.05, respectively). 5. The Cesarean section rate were 16%, 8.7%, 12.5%, and 6.8% for control, group 1, group 2, and group 3, respectively. 6. There were no significant differences in 1, 5-min Apgar score, and the incidence of neonatal complication in each group. 7. The side effects (nausea, vomiting, headache, hypertonus, and fever) developed in 9 case (3.0%) of group 1, 2, and 3. There were no significant differences in side effect in each group.
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