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양광영,임경택,이동하,김택현,김인권 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.1
The purpose of this work is to investigate fatigue damage of quasi-isotropic laminates under tensile loading in different directions. Low cycle fatigue tests of [O/-60/+60]s laminates and [+30/-30/90]s laminates were carried out. Materials systems used are AS4/Epoxy and AS4/PEEK. The fatigue damage of [+30/-30/90]s is very different from that of [O/-60/+60]s. The position of delamination generated at AS4/Epoxy and AS4/PEEK laminates were differentiated by the matrix difference that is, we suppose, the value of both G (critical energy release rate of mode-I) and G (critical energy release rate of mode-Ⅲ) difference. The experimental results are compared with the result obtained from the method of determining strain energy release rate components proposed by the authors.
Shin, Dong Hun,Kim, Gwang Ha,Lee, Bong Eun,Lee, Jong Wook,Ha, Dong Woo,Jeon, Hye Kyung,Baek, Dong Hoon,Song, Geun Am,Ahn, Sang Jeong,Park, Do Youn Springer-Verlag 2017 Surgical endoscopy Vol.31 No.10
<P>Gastric carcinoma with lymphoid stroma (GCLS) is a rare disease known to have unique features and a favorable prognosis. This study aimed to determine the clinicopathologic features of early GCLS (EGCLS) and define the feasibility of endoscopic submucosal dissection (ESD) for EGCLS. We performed a retrospective analysis of 70 EGCLS patients treated via ESD or surgery and 1626 patients who underwent surgical resection for early non-GCLS (ENGCLS) between January 2007 and December 2014 at Pusan National University Hospital, Busan, Republic of Korea. The mean age of EGCLS patients was 58 years (range 36-77 years); a male predominance (3.7:1) was observed, and 81.4% showed Epstein-Barr virus positivity. Compared with ENGCLS, EGCLS was macroscopically more elevated (34.3 vs. 18.0%, P = 0.003) and located more proximally (upper third: 37.1 vs. 9.7%, P < 0.001). Tumor size was smaller (2.1 +/- 1.1 vs. 3.1 +/- 2.0 cm, P < 0.001), but submucosal invasion was more frequent (77.1 vs. 44.4%, P < 0.001) and deeper in the EGCLS group. Among the 59 EGCLS patients who were treated surgically, only two (3.4%) showed lymph node metastasis (LNM). Despite submucosal invasion, EGCLS showed a lower LNM rate (4.0 vs. 19.4%, P = 0.007) than ENGCLS, even in patients with SM3 EGCLS (5.3 vs. 24.5%, P = 0.007). There were no recurrences in the available ten patients who underwent ESD alone during a mean follow-up of 37.2 months. In this study, we observed unique clinicopathologic features with a very low LNM rate in EGCLS. We consider ESD a potentially curative treatment strategy for EGCLS despite deep submucosal invasion, especially in patients with poor performance status and significant comorbidities.</P>
하동우 ( Dong Woo Ha ),김광하 ( Gwang Ha Kim ),김동욱 ( Dong Uk Kim ),배민정 ( Min Jung Bae ),김보원 ( Bo Won Kim ),전혜경 ( Hye Kyung Jeon ),박도윤 ( Do Yun Park ),서형일 ( Hyung Il Seo ) 대한소화기학회 2011 대한소화기학회지 Vol.58 No.3
Neuroendocrine tumors are usually found in the ileum, appendix, rectum, colon and stomach. Ampullary neuroendocrine tumor is extremely rare and only a few cases of neuroendocrine carcinoma of the minor papilla have been reported. The preoperative diagnosis is very challenging because either asymptomatic or manifests as nonspecific abdominal pain. The tumor is relatively small and located at the deep mucosa and submucosa. Endoscopy with deep biopsy, endoscopic retrograde cholangiopancreatography and endoscopic ultrasonography are good diagnostic tools. The best therapeutic choice is surgery. We report an unusual case of a 55-year-old woman who underwent endoscopy as part of a regular health checkup and was diagnosed a neuroendocrine carcinoma in the minor papilla, which was successfully resected by pancreaticoduodenectomy. (Korean J Gastroenterol 2011;58: 144-148)
담관-십이지장 문합을 시행받은 환자에서 혈액담즙증으로 발현한 담관암종
류동엽 ( Dong Yup Ryu ),정재훈 ( Jae Hoon Cheong ),이동건 ( Dong Gun Lee ),이봉은 ( Bong Eun Lee ),김동욱 ( Dong Uk Kim ),김광하 ( Gwang Ha Kim ),송근암 ( Geun Am Song ) 대한소화기학회 2010 대한소화기학회지 Vol.56 No.3
Hemobilia occurs when injury or disease causes communication between intrahepatic blood vessels and the intrahepatic or extrahepatic biliary system. The causes of hemobilia include trauma, gallstone disease, vascular malformation, inflammation, and biliary or hepatic tumors. Hemobilia could be diagnosed by endoscopy, hepatic angiography, computed tomography, and ultrasonogram. Patients with hemobilia may present with biliary colic, obstructive jaundice and gastrointestinal bleeding. Extrahepatic cholangiocarcinoma usually presents with obstructive jaundice and is one of the unusual cause of hemobilia. We, herein, report a case of hemobilia caused by cholangiocarcinoma in a 69-year-old woman. She had the past history of lung cancer and choledochoduodenostomy due to gallstone. Esophagogastroduodenoscopy revealed a blood clot protruding from the choledochoduodenostomy site and the ulcerative mass in the common bile duct. Pathologic examination of the ulcerative mass was compatible with those of cholangiocarcinoma. (Korean J Gastroenterol 2010;56:205-208)
( Dong Chan Joo ),( Gwang Ha Kim ),( Do Youn Park ),( Joon Hyung Jhi ),( Geun Am Song ) 대한소화기학회 2014 Gut and Liver Vol.8 No.6
Background/Aims: Superficial esophageal squamous cell carcinoma (SESCC) is being increasingly detected during screening endoscopy. Endoscopic submucosal dissection (ESD) allows for en bloc and histologically complete resection of lesions. This study assessed the technical feasibility and long-term outcomes of ESD for SESCCs. Methods: Between January 2005 and August 2012, 27 patients with 28 SESCCs underwent ESD at Pusan National University Hospital. The en bloc and pathologically complete resection rates, complication (perforation and bleeding) rate, incidence of esophageal stricture after ESD, and overall and disease-specific survival rates were evaluated. Results: The en bloc and pathologically complete resection rates were 93% and 83%, respectively. No significant bleeding occurred, and perforation with mediastinal emphysema was observed in two patients (7%). Post- ESD stricture occurred in two patients (7%) who had mucosal defects involving more than three-fourths of the esophageal circumference. During a mean follow-up of 23 months, local tumor recurrence was seen in two of four lesions with pathologically incomplete resection; one was treated by re-ESD, and the other was treated by surgical esophagectomy. The 5-year overall and disease-specific survival rates were 84% and 100%, respectively. Conclusions: ESD seems to be a feasible, effective curative treatment for SESCCs. All patients should be closely followed after ESD. (Gut Liver 2014;8:612- 618)
( Dong Hwi Kim ),( Gwang Chul Lee ),( Sang Hong Lee ),( Chi Hyoung Pak ),( Sang Ha Park ),( Sung Jung ) 대한슬관절학회 2016 대한슬관절학회지 Vol.28 No.3
Purpose: There are many methods to reduce massive bleeding during total knee arthroplasty (TKA). In our study, tranexamic acid and neutral drainage were used to decrease total blood loss. Materials and Methods: The study was performed on 97 TKA patients from March 2012 to January 2013. In the study group, tranexamic acid was administered and neutral drainage was applied. The study group had group I (unilateral, n=29) and group III (bilateral, n=17). The control group had group II (unilateral, n=35) and group IV (bilateral, n=16). Results: In group I, the drainage volume on the 1st and 2nd postoperative days and the total drainage decreased with statistical significance (p<0.05). Between group III and group IV, group III had less drainage volume. In group III, the drainage volume on the 1st postoperative day and total drainage volume decreased statistically significantly (p<0.05). Between groups I and II, total blood loss showed no statistically significant difference, whereas between groups III and IV, the value was significantly different. Conclusions: Intravenous administration of tranexamic acid with neutral drainage for 3 postoperative hours is a recommendable method because it can be helpful in reducing total blood loss in bilateral TKA.