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공침범으로 제조한 마그네시아 부분안정화 지르코니아 소결체의 특성에 미치는 열처리 효과
이재원,오응주,정윤중,이형복 明知大學校 産業技術硏究所 1989 産業技術硏究所論文集 Vol.8 No.-
The powder of ZrO₂-MgO systems prepared by co-precipitation method using ZrOCl₂· 8H₂O and MgCl₂· 6H₂O as the sintering materials. They are sintered and than heat treated to know that effects of agoing time and temperature on mechanical and electrical properties. The powder ZrO₂-MgO systems have∼30nm crystal size and tetragonal phase. The mechanical properties of these partially stabilized ZrO₂- MgO specimens are shown the best value when they are aged at 1,100℃ for 1 hr and at 1,450℃ for 10 hrs, but these are better than those, and while the specimens of 9.5 mole% in these thermal conditions. Electrical conductivities are measured as a function of temperature in the range of 500℃ to 1,000℃. The temperature dependence of electrical doncutivities is shown the activation energies by the heat reat conditions; no heat treating, heat treating at 1,100℃ for 1 hr, and heat treating at 1,450℃ for 10 hrs, and their values are 21.5㎉/㏖, 34.3㎉/㏖, and 43.5㎉/㏖, respectively.
Short communication : Korea-Japan Symposium for Autoimmune Pancreatitis
( Jae Bock Chung ),( Seon Joo Kim ),( Myung Hwan Kim ),( Jae Hoon Lim ),( Se Jin Jang ),( Jikon Ryu ),( Kyu Taek Lee ),( Terumi Kimisawa ),( Tetsuhide Ito ),( Isao Nishimori ),( Kazuichi Okazaki ),( S The Editorial Office of Gut and Liver 2007 Gut and Liver Vol.1 No.2
정재복(Jae Bock Chung),송시영(Si Young Song),강진경(Jin Kyung Kang),박인서(In Suh Park) 대한소화기학회 1994 대한소화기학회지 Vol.26 No.5
N/A Pancreatic pseudocysts are a complication of underlying pancreatic inflammation, most commonly alcohol induced pancreatitis, or of trauma. Pseudocysts present a broad spectrum of clinical findings and management must be individualized. To evaluate the factors influencing the outcome of pancreatic pseudocydts, we analysed the 41 cases of pancreatic pseudocysts who admitted to the Severance hospital from January 1980 to December 1989. The rnean age was 42.1 years and male to female ratio 2.7:1. The causes of pancreatic pseudocysts were pancreatitis in 48.8%, trauma in 36.6%, pancreatic cancer in 2.4% and unknown in 12.1%. The clinical symptoms were abdominal pain, nausea and/or vomiting, and fever and/or chill- ness', the physical signs were abdominal tenderness, palpable rnass and abdominal distension in the order of frequency. Complications were noted in 28 cases(68.3%) of the 41 cases and pleural effusion was the most commonly encountered in 34.1%, followed by ascites, infection of pseudocyst and obstructive jaundice in the order of frequency. The complications according to the cause of pseudocysts were 75.0% in those due to pancreatitis and 53.5% in trauma. Ac- cording to the size of pseudocyst there were 60.0% complications in those less than 10 cm and 81.2% in those above 10cm, and by location 75.0% in head, 73.7% in body and 50.0% in tail respectively. Surgical treatment was performed in 25 cases, improvement by conservative management in 8 cases and 5 cases were lost to follow up. Mean duration of disappearance of pseudocyst was 59.2(14 98)days and the mean size of the pseudocyst was 8.7(5 15)cm in pa- tients with improvement by conservative care. Comparison between patients with improve- ment by conservative treatment and others(except 5 cases lost to follow up) shows that spon- taneous improvement was commonly encountered in pancreatic pseudocysts causes by pancre- atitis and those less than 10cm in size. In conclusion, the pancreatic pseudocyst which is due to pancreatitis and less than 10 cm in size may be treated with conservative treatment for 2 months. However, additional study is necessary in many cases. (Korean J Gastroenterol 1994; 26: 859 868)
위장관 소화성 궤양의 재출혈에서 반복적인 내시경적 지혈술의 유용성과 치료 실패의 예측인자
정재연(Jae Youn Cheong),이용찬(Yong Chan Lee),장혁재(Hyuk Jae Chang),송시영(Si Young Song),김원호(Won Ho Kim),한광협(Kwang Hyub Han),정재복(Jae Bock Chung),전재윤(Jae Yoon Chon),강진경(Jin Kyung Kang),박인서(In Suh Park),문영명(Young 대한소화기학회 2001 대한소화기학회지 Vol.37 No.5
Background/Aims: After endoscopic treatment of peptic ulcer bleeding, rebleeding occurs in 15 to 20 percent of patients. We investigated the factors predicting the failure of initial endoscopic treatment in patients with peptic ulcer bleeding and the usefulness of repeated endoscopic treatment in peptic ulcer patients with rebleeding after initial endoscopic treatment. Methods: Clinical data were retrospectively collected from 376 patients (311 males and 65 females, mean age 53.9 years) with peptic ulcer bleeding between June 1995 and May 1999. Results: Of 376 patients, rebleeding after initial endoscopic treatment occurred in 50 patients (13.3%). Eight patients who failed to initial endoscopic hemostasis underwent operation immediately. The presence of major stigmata on endoscopy (p=0.001) and shock at admission (p=0.001) were two significantly independent factors predictive of rebleeding after initial endoscopic treatment. Among the patients with rebleeding, repeated endoscopic treatment was successful in 26 patients (61.9%), but 16 patients (38.1%0 underwent salvage surgery due to the failure of hemostasis. Patients who did not respond to endoscopic retreatment were more likely to have ulcers ≥2 cm in diameter (p=0.027). Conclusions: Repeated endoscopic treatment can reduce the need for surgery. Ulcer size ≥2cm is an independent factor in predicting the failure of repeated endoscopic treatment in peptic ulcer patients with rebleeding. Therefore, surgery should be considered in the case. (Korean J Gastroenterol 2001;37:319-326)