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人蔘이 卵巢摘出로 誘發된 흰쥐의 骨多孔症 예방에 미치는 효능
정국영,서부일,이은숙,변부형,신순식,박지하 대한본초학회 2004 大韓本草學會誌 Vol.19 No.1
Objectives : The present study has been undertaken to investigate the effects of Ginseng Radix on prevention of osteoporosis in ovariectomized rats. Methods : In this experiment, the rats were ovariectomized. Rats were administered by 2 kinds of medicine, Estradiol, Ginseng Radix. The levels of bone mineral density, osteocalcin, ALP, phosphorus, calcium in serum, deoxypyridinoline in urine, calcium, phosphorus, ash weight of bone, body weight and uterus weight were measured. Results : The levels of spinal bone mineral density was significantly increased in comparison with OVX group at 8 weeks in Ginseng Radix group. The levels of serum didn t show significant change in comparison with OVX group in Ginseng Radix group. The levels of urine deoxypyridinoline showed significant decrease in comparison with OVX group in Ginseng Radix group. The levels of femoral and fibula-tibial ash weight didn t show significant increase in comparison with OVX group in Ginseng Radix group. The levels of femoral and fibula-tibial calcium showed significant increase in comparison with OVX group in Ginseng Radix group. The levels of femoral and fibula-tibial phosphorus showed significant increase in comparison with OVX group in Ginseng Radix group. The levels of body weight didn t show significant changes in comparison with OVX group in Ginseng Radix group. The levels of uterus weight didn t show significant changes in comparison with OVX group in Ginseng Radix group. Conclusions : Reviewing these experimetal results, it appears that Ginseng Radix have efficacy on prevention of osteoporosis. And further study should be conducted to illustrate in depth the curing and prevention of osteoprosis.
사망진단서(사체검안서) 상의 선행사인으로부터 사망통계의 원사인이 선정되는 비율 : 3개 대학병원에서 교부된 사망진단서를 중심으로
박우성,박석건,정철원,김우철,탁우택,김부연,서순원,김광환,서진숙,부유경 한국의료QA학회 2004 한국의료질향상학회지 Vol.11 No.1
Background : To exatnine the problems intolved in writing practice of death certificates, we cotnpated the determination of underlying cause of death for wital statistics using recorded underlying cause of death in issued death statistics. Methods : We collected 688 rnortality certificates issue in year of 2,000 from 3 university hospitals. And we also collected vital statistics from ministry of statistics. The causes of death were coded by experienced medical record wpecialists. And causes of death determined at ministry of statistics for national vita statistics were mapped to causes of death recorded at each death certificates. The rate that underlying causes of death for vital statistics were derived from underlying causes of death recorded at issued death certificaties sere analysed. Results : 64.5% of underlying cause of death for could be derived from underlying cause of death recorded at issued death certificates, 8.6% derived from intermediate cause of death, and 3.9% derived from direct cause of death. In 23% of cases, underlying cause of death could not be derived using issued death certificates. The rate that underlying cause of death for vital statistics could be derived from underlying cause of death recorded at death certificates was different between 3 university hospitals. Ane the rate was also different between death certificates and postmortem certificates. We classified the causes of death using 21 major categories. The rate was different between diseases or conditions tha caused death too. Conclusion : When we examined the correctness of death certificate writing practice using abpve methods, cortectness of writing could not be told as satisfactory. There was difference in correctness of writing between hospotals, between death certificates and postmortem certificates, and between diseases and conditions that caused death. With this results, we suggested some strategy to improve the correctness of death certificate writing practice.
The Effect of Serrated Fins on the Flow Around a Circular Cylinder
Boo, Jung-Sook,Ryu, Byong-Nam,Kim, Kyung-Chun The Korean Society of Mechanical Engineers 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.6
An experimental study is performed to investigate the characteristics of near wake flow behind a circular cylinder with serrated fins using a constant temperature anemometer and flow visualization. Various vortex shedding modes are observed. Fin height and pitch are closely related to the vortex shedding frequency after a certain transient Reynolds number. The through velocity across the fins decreases with increasing fin height and decreasing fin pitch. Vortex shedding is affected strongly by the velocity distribution just on top of the finned tube. The weaker gradient of velocity distribution is shown as increasing the freestream velocity and the fin height, while decreasing the fin pitch. The weaker velocity gradient delays the entrainment flow and weakens its strength. As a result of this phenomenon, vortex shedding is decreased. The effective diameter is defined as a virtual circular cylinder diameter taking into account the volume of fins, while the hydraulic diameter is proposed to cover the effect of friction by the fin surfaces. The Strouhal number based upon the effective diameters seems to correlate well with that of a circular cylinder without fins. After a certain transient Reynolds number, the trend of the Strouhal number can be estimated by checking the ratio of effective diameter to inner diameter. The normalized velocity and turbulent intensity distributions with the hydraulic diameter exhibit the best correlation with the circular cylinder's data.
夫禎淑 부산대학교 1974 論文集 Vol.18 No.2
This study deals with the variation of hardness and the behavior of slip bands during the fatigue of a low carbon steel at room temperature. The specimens were annealed for an hour at 930℃ and the used testing machine is a type of high temperature rotating bending machine of 3450 rpm. The vickers hardness tester and the optical microscope were used in a study of the variation of hardness and the behavior of slip bands during the fatigue process of specimens. The following results were obtained: 1) The hardness value was tend to increase with increment of cycle number N and the stress amplitude. 2) The development of slip bands was slowly progressed by the resistant boundary.