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연속파형 Nd:YAG 레이저를 이용한 SM45C 용접특성
유영태,노경보,오용석 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.2
The Nd:YAG laser in combination with the optical fiber increase the automation and the flexibility of a whole industry. The Nd:YAG laser welding process in one of the most advanced manufacturing technologies owing to its high speed and penetration. This paper describes the weldability of SM45C carbon steel for machine structural use by Nd:YAG laser. Major process parameters were position of focus, travel speed and laser power. The results showed that peneration depth of the weld was increased with increasing applied laser power. Microstructural examinations and calculations and indicated that the microstructure of the laser weld, which experienced very high heating and cooling cycle during welding process. The results of this study provide application possibility of Nd:YAG laser welding for SM45C carbon steel
Effect of Preoperative Treatment for Hepatic Resection in Patient with HCC
( Tae Yun Lee ),( Dong Goo Kim ),( Bong Jun Kwak ),( Jae Hyun Han ),( Ho Joong Choi ),( Tae Ho Hong ),( Young Kyoung You ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: Hepatic resection is a cornerstone in the treatment of HCC patients. However, after resection, low resection rate and high recurrence rate are problematic. In liver transplantation, preoperative treatment has a good outcome, but it is doubtful whether resection shows the same result. Methods: From January 2005 to December 2015, 274 patients who underwent curative hepatic resection in our center were included. And then, they were divided into hepatic resection only (HRO) group (n=208, 75.9%) and preoperative treatment (PT) group (n=66, 24.1%). Preoperative treatment was TACE, and effect after treatment was analyzed by changes by mRECIST and tumor marker (AFP, PIVKA). Also, PT group was divided into responder (complete response/partial response in mRECIST or reduction of tumor marker) and non-responder (stable disease/progressive disease in mRECIST or increase of tumor marker). Then, we evaluated recurrence, the disease-free survival rate (DFS), the overall survival rate (OS), and various other factors based on the characteristics of patients and tumors according to two groups. Results: Of the 274 patients, the recurrence rate was 48.2% and related factors were tumor size, MVI, TNM stage, and preoperative treatment. 5-year DFS and OS rates were 42.6% and 69.8%. We found no statistically significant difference in the DFS (P=.397) and OS (P=.373) rates between HRO and PT group. Also, classification by Milan criteria did not affect DFS or OS. HRO and responder in PT group showed no difference between DFS and OS, but non-responder in PT group showed significantly worse in both DFS and OS. (DFS, P=.029, OS, P=.003 in mRECIST, DFS, P=.079, OS, P=.002 in AFP) Conclusions: Hepatic resection is still an effective tool for initial treatment of HCC. Preoperative treatment did not affect the outcome after resection. If there was no response after preoperative treatment, resection should be considered carefully since postoperative results were statistically poor. To further ensure this result, further studies will be needed to collect more cases.
NRF2 Blockade Suppresses Colon Tumor Angiogenesis by Inhibiting Hypoxia-Induced Activation of HIF-1α
( Tae Hyoung Kim ),( Eu Gene Hur ),( Su Jin Kang ),( Jung Ae Kim ),( Dinesh Thapa ),( You Mie Lee ),( Sae Kwang Ku ),( Yun Jun Jung ),( Mi Kyoung Kwak ) 영남대학교 약품개발연구소 2011 영남대학교 약품개발연구소 연구업적집 Vol.21 No.-
( Tae Ho Hong ),( Young Chul Youn ),( Young Kyoung You ),( Dong Goo Kim ) 대한내과학회 2011 대한내과학회지 Vol.81 No.5
Purpose: The aim of this report was to describe a new reconstructive technique of pancreaticogastrostomy and to also discuss this procedure`s effectiveness for reducing the incidence of postoperative complications. Methods: We retrospectively analyzed early surgical outcomes in 21 consecutive patients who underwent this novel pancreaticogastrostomy after pancreaticoduodenectomy. Pancreaticogastrostomy was completed with 2 transpancreatic sutures with buttresses on both the upper and lower edges of the implanted pancreas through the retracted anterior gastrotomy. Results: Operative mortality was zero and morbidity was 23.8%. A significant pancreatic fistula occurred in 1 patient (4.7%; grade B). Conclusion: This technique is very easy to perform, less traumatic to the pancreatic stump, can be performed through a mini-laparotomy due to good vision and straight sutures, and it is secure owing to anchoring of the invaginated pancreatic stump to the stomach`s posterior wall with buttresses. The results of this pilot study indicate that the technique may provide a favorable outcome and could be an alternative method of pancreatoenteric anastomosis. However, to determine its superiority over the conventional procedures, this operative technique should be evaluated more comprehensively in a larger series.