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스프링강(SUP9A)과 SM25C의 마찰용접최적화에 관한연구
정석주,이기중 서울산업대학교 산업대학원 2000 大學院論文集 Vol.7 No.-
Friction welding is to jiin two materials by the frictional heat that occurs on the surface area of the two pressurized materials due to their relative motion. The pressurized welding method can be applied to the welding of the same material of different materials. The friction-welded SM25C can be selected as a substitute for the spring steel which is used in the machinery, airplane and automobile, etc. This substitution would provide cost reduction of material and the weight of the welded part. The results showed that friction welding could keep good mechanical properties of the welded part by applying optimum welding condition and proper heat treatment.
Outcomes of emergency endovascular versus open repair for abdominal aortic aneurysm rupture
Suk Jung Choo,Yang-Bin Jeon,Sam-Sae Oh,신성호 대한외과학회 2021 Annals of Surgical Treatment and Research(ASRT) Vol.100 No.5
Purpose: Ruptured abdominal aortic aneurysm (rAAA) is one of the most common aortic emergencies in vascular surgery and is associated with high operative mortality and morbidity rates despite recent treatment advances. We evaluated operative mortality risks for the outcomes of emergency endovascular aneurysm repair (eEVAR) vs. open repair in rAAA. Methods: Twenty patients underwent eEVAR (n = 12) or open repair (n = 8) for rAAA between 2016 and 2020. We adopted the EVAR first strategy since 2018. Primary endpoints included in-hospital mortality and 1-year survival. The outcome variables were analyzed with Fisher exact, Mann-Whitney test, and linear by linear association. The Kaplan-Meier method was used to estimate survival. Results: There were 13 males (65.0%) and the median age of the study cohort was 78.0 years (range, 49–88 years). Inhospital mortality occurred in 7 patients (35.0%); 5 (50.0%) in the early period and 2 (20.0%) in the later period of this series. According to the procedure type, 4 (50.0%) and 3 (25.0%) in-hospital mortalities occurred in the open repair and eEVAR patients, respectively. In 6 patients (50.0%), eEVAR was performed on unfavorable anatomy. The 1-year survival of eEVAR vs. open repair group was 75% ± 12.5% and 50% ± 17.7%, respectively. On univariate analysis, preoperative highrisk indices, postoperative acute renal failure requiring dialysis, pulmonary complications, and prolonged mechanical ventilation were associated with higher operative mortality. Conclusion: The current data showed relatively superior outcomes with eEVAR vs. open repair for rAAA, even in some patients with unfavorable anatomy supporting the feasibility, efficacy, and safety of EVAR first strategy.
Heart Transplantation. A Retrospective Analysis of the Short and Intermediate Term Results
Suk Jung Choo,Jung Hun Oh,Jae Joong Kim,Meong Gun Song Korean Society of Critical Care Medicine 2001 Acute and Critical Care Vol.16 No.1
BACKGROUND: Heart transplantation is still the best therapy for end-stage heart disease. However, the longterm outcome among different institutions vary. The current series is an assessment of the important factors which determine prognosis. METHODS: Between November of 1992 and September of 2000, 85 heart transplantations were performed at our institution. The standard technique was used in the first 57 patients (group I) where as in the latter 28 patients (group II), the Bicaval technique was utilized. The mean waiting time was approximately 4.7 months, and the causes in decreasing order were Dilated cardiomyopathy (n=69), Ischemic cardiomyopathy (n=10), Hypertrophic cardiomyopathy and others (n=6). The mean follow up was about 31 months. The immunosuppressive protocol comprised cyclosporin, Azathioprine (AZA), and prednisone. Later changes included induction with IL-2 receptor monoclonal antibody and changing AZA to mycophenolate mofetil. RESULTS: The mean donor ischemic time was 95.8 28.3 mins and the implantation time was 59.3 7.6 mins. There was a higher incidence of significant TR in group I along with a greater postoperative pacing requirement. There were 35 postoperative complications of which infectious events were most common (26). Of these, only 3 were early infections and the rest occurred late postoperatively. There were a total of 8 mortalities of which only one occurred early postoperatively and among the 7 late deaths, 3 were medically related and 4 were related to social factors. Only 5% of the patients had graft vascular disease. The overall 1YSR was 92% and the 5 YSR was 85%. CONCLUSIONS: The superior long term results of this current series was attributable to strong early immunosuppression, a homogenous population, and very low incidence of CMV infection.
Sohn Suk Ho,Kim Kyung Hwan,Kang Yoonjin,Choi Jae Woong,Lee Seung Hyun,Shinn Sung Ho,Lim Cheong,Sung Kiick,Yoo Jae Suk,Choo Suk Jung 대한의학회 2023 Journal of Korean medical science Vol.38 No.48
Background: In the era of transcatheter aortic valve implantation, this study was conducted to investigate the current trend of aortic valve procedures in Korea and to evaluate the early and mid-term outcomes of isolated surgical aortic valve replacement (SAVR) using bioprosthetic valves in contemporary Korea. Methods: Contemporary outcomes of isolated bioprosthetic SAVR in Korea were analyzed using the datasets on a multicenter basis. Patients who underwent isolated SAVR using bioprostheses from June 2015 to May 2019 were included, and those with concomitant cardiac procedures, SAVR with mechanical valve, or SAVR for infective endocarditis were excluded. A total of 456 patients from 4 large-volume centers were enrolled in this study. Median follow-up duration was 43.4 months. Early postoperative outcomes, mid-term clinical outcomes, and echocardiographic outcomes were evaluated. Results: Mean age of the patients was 73.1 ± 7.3 years, and EuroSCORE II was 2.23 ± 2.09. The cardiopulmonary bypass time and aortic cross-clamp times were median 106 and 76 minutes, respectively. SAVR was performed with full median sternotomy (81.8%), right thoracotomy (14.7%), or partial sternotomy (3.5%). Operative mortality was 1.8%. The incidences of stroke and permanent pacemaker implantation were 1.1% and 1.1%, respectively. Paravalvular regurgitation ≥ mild was detected in 2.6% of the patients. Cumulative incidence of all-cause mortality at 5 years was 13.0%. Cumulative incidences of cardiovascular mortality and bioprosthetic valve dysfunction at 5 years were 7.6% and 6.8%, respectively. Conclusion: The most recent data for isolated SAVR using bioprostheses in Korea resulted in excellent early and mid-term outcomes in a multicenter study.
Trial of everolimus-eluting stents or bypass surgery for coronary disease.
Park, Seung-Jung,Ahn, Jung-Min,Kim, Young-Hak,Park, Duk-Woo,Yun, Sung-Cheol,Lee, Jong-Young,Kang, Soo-Jin,Lee, Seung-Whan,Lee, Cheol Whan,Park, Seong-Wook,Choo, Suk Jung,Chung, Cheol Hyun,Lee, Jae Won Massachusetts Medical Society 2015 The New England journal of medicine Vol.372 No.13
<P>Most trials comparing percutaneous coronary intervention (PCI) with coronary-artery bypass grafting (CABG) have not made use of second-generation drug-eluting stents.</P>
주석규,김병직,정병현,서진수,나경욱,김진환,조진호,석승엽 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.2
Objectives: The object of this study is to evaluate the type and treatment of elbow fractures in children. Materials and Methods: A clinical analysis was performed on 147 pediatric patients with elbow fractures from December 1999 to May 2001 who were followed up for more than one year. Results: Fractures of supracondylar in children was most common injuries of the elbow in 80 cases(54%). The most common mechanism was fall from height in 115(78%). The most common place of trauma was playground in 125(85%). Conclusion: The elbow fractures in children are extremly common and sometimes quitedifficult todertermine thediagnosis. Failure to diagnose adequately andtreat fractures of the elbow in children may result in severe complications, such as Volkmann' sischemic contracture, never injuries and angular deformity. Therefore, accurate diagnosis and reduction without additional trauma and good maintenance are essential by closed or open method.
Choo, Eun Jeong,Rhee, Yun-Hee,Jeong, Soo-Jin,Lee, Hyo-Jung,Kim, Hyun Seok,Ko, Hyun Suk,Kim, Ji-Hyun,Kwon, Tae-Rin,Jung, Ji Hoon,Kim, Jin Hyoung,Lee, Hyo-Jeong,Lee, Eun-Ok,Kim, Dae Keun,Chen, Chang-Yan Pharmaceutical Society of Japan 2011 BIOLOGICAL & PHARMACEUTICAL BULLETIN Vol.34 No.1
<P>Anethole is known to possess anti-inflammatory and anti-tumor activities and to be a main constituent of fennel, anise, and camphor. In the present study, we evaluated anti-metastatic and apoptotic effects of anethole on highly-metastatic HT-1080 human fibrosarcoma tumor cells. Despite weak cytotoxicity against HT-1080 cells, anethole inhibited the adhesion to Matrigel and invasion of HT-1080 cells in a dose-dependent manner. Anethole was also able to down-regulate the expression of matrix metalloproteinase (MMP)-2 and -9 and up-regulate the gene expression of tissue inhibitor of metalloproteinase (TIMP)-1. The similar inhibitory effect of anethole on MMP-2 and -9 activities was confirmed by zymography assay. Furthermore, anethole significantly decreased mRNA expression of urokinase plasminogen activator (uPA), but not uPA receptor (uPAR). In addition, anethole suppressed the phosphorylation of AKT, extracellular signal-regulated kinase (ERK), p38 and nuclear transcription factor kappa B (NF-κB) in HT-1080 cells. Taken together, our findings indicate that anethole is a potent anti-metastatic drug that functions through inhibiting MMP-2/9 and AKT/mitogen-activated protein kinase (MAPK)/NF-κB signal transducers.</P>