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Squeeze Casting 에 의한 SiC 입자강화 Al 합금기 복합재료의 마멸 특성
한상원,우기도,김석원 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.1
This study was aimed to investigate influence of microstructure, abrasive heat affected zone(AHAZ), primary silicon and eutectic silicon on abrasive characteristics of AC8A/SiC_p composite fabricated by the squeeze casting under various conditions. The abrasive characteristics was improved by addition of Mg and Ca elements because of improvement of SiC_p wettability and hardness in matrix. It is general theory that abrasive amount is decreased with increase of squeezing pressure. In this study, however, as squeezing pressure applies over a certain limit value(220MPa), the abrasive resistance under the condition of the high abrasive speed(3.67 ㎧) is not increased with increase of squeezing pressure. This is due to the crack by the generation of abrasive heat and fatigue below abrasive surface under the condition of high abrasive speed(3.67 ㎧). In abrasive heat affected zones of AC8A and AC8A/SiC_p composite fabricated by same squeezing pressure(220MPa), eutectic Si of directly below abrasive surface is finer than that of matrix, and abrasive heat affected zone of AC8A/SiC_p composite is thinner than that of AC8A. These reasons are that abrasive heat makes α dendrite and eutectic Si fine in AC8A/SiC_p composite. Therefore, the hardness of heat affected zone of directly below abrasive surface was increased sharply owing to abrasive heat.
한상원,한혁동,차동수,김명철,박형진,김일한,김남식 대한산부인과학회 1997 Obstetrics & Gynecology Science Vol.40 No.9
This study analyzed the outcome of 26 cases of cesarean hysterectomy performed at Wonju Christian Hospital, College of medicine, Yonsei university during 15 years from January, 1982 to May, 1996. There were 27,602 deliveries during this period. Cesarean hysterectomy was performed in 11 of 10,373 cesarean section(0.11 %) and in 15 of 17,229 vaginal deliveries(0.09 %). The age of pati- ents varied from 20 to 48. Indications for emergency cesarean hysterectomy were uterine atony (46.2 %), uterine rupture(26.9 %), and placenta accreta(19.2 %). The relative risk of emergency hysterectomy was 1.22(95 % confidence interval 0.56 to 2.65) for cesarean deliveries, 1.91(95 % confidence interval 0.73 to 4.98) for prior cesarean deliveries and 20.56(95 % confidence interval 10.85 to 38.95) for placenta previa. The patients who had cesarean hysterectomy received from 750 ml to 11,500 ml of blood transfusion with a mean of 3,500 ml. No significant differences in length of operating time, amount of blood loss and postoperative complications were found between total abdominal hysterectomy and subtotal abdominal hyste- rectomy. In about 1/2 of total patients (46.2 %), there were no operative complications. Maternal death was found in 1 case. Hemorrhage still remains main cause of maternal mortality, the decision of hysterectomy must be conjunction with maternal life saving and free from various dangerous sequalae. So in this study, clinical evaluation for cesarean hysterectomy and an attempt to identify risk factor that might pridict those patients likely to require emergency hysterectomy was made.
Early Dorsal Midbrain Syndrome Mimicking an Adie’s Tonic Pupil
한상원,류정호,백종삼,김정연,황용순,박재현 대한신경과학회 2010 Journal of Clinical Neurology Vol.6 No.1
Background While tonic pupils have been attributed to various diseases, including syphilis,herpes zoster, orbital trauma, temporal arteritis, endometriosis, and paraneoplastic syndromes,obstructive hydrocephalus has not been implicated. Case Report A 36-year-old woman visited a neurology department with a 7-day history of throbbing headache and blurred vision in both eyes. She had early dorsal midbrain syndrome mimicking an Adie’s tonic pupil, and cholinergic supersensitivity was demonstrated using topical 0.125% pilocarpine. Brain MRI revealed obstructive hydrocephalus at the level of the aqueduct of Sylvius, and her symptoms resolved 4 days after surgery. Conclusions We report a patient with early dorsal midbrain syndrome that was initially believed to represent a tonic pupil on the basis of pharmacologic testing. The findings in our patient suggested that early dorsal midbrain syndrome mimicking an Adie’s tonic pupil can be caused by obstructive hydrocephalus compressing the Edinger-Westphal nucleus.