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金興植,尹錫吉,崔性洙,趙和錫 울산대학교 1979 연구논문집 Vol.10 No.1
고장력 알루미늄 합금의 잔류응력을 제거하기 위하여 종래의 고압 증기 대신 비등하는 trichloroethylene을 사용한 새로운 uphill quench 법을 연구하였다. 잔류응력을 제거하기 위한 최적조건을 찾기 위해 2024와 7075 알루미늄 합금봉을 사용하여 시편의 긁기열처리 조건 및 냉각수 온도를 변화시켜 실험하였다. 잔류응력이 제거되는 정도는 용체와 처리한 재료 내부의 잔류응력 상태에 따라 달라지나 용체와 처리한 재료를 용체화 처리후 즉시 비등하는 trichloroethylene에 uphill quench하고 인공시효처리를 할 때 잔류응력이 가장 잘 제거되었다. A new method of uphill quench using trichloroethylene instead of conventional high press vapor to reduce residual quenching stresses in aluminum alloy rods has been studied. Investigations were made on 2024 and 7075 alloy rods of various sizes with various quench and heat treatment procedures, in order to find the optimum conditions for relieving the residual stresses. The reduction of residual stresses was found to be a function of variables such as temperature rooting water, size and heat treatment history of specimen. The best result wasobtained when an uphill quench in boiling trichloroethylene followed by T-6 aging was made immediately after the solid solution treatment.
Cho, Sungsoo,Kang, Tae Soo Yeungnam University College of Medicine 2018 Yeungnam University Journal of Medicine Vol.35 No.1
Coronary spasm generally occurs in patients with minimal atherosclerotic plaque lesion, and it has a rather favorable prognosis. However, in some cases, coronary spasm may induce myocardial infarction and even sudden cardiac death (SCD). Here, we report a case in which multi-vessel intractable coronary vasospasm suddenly occurred in a diffuse atherosclerotic lesion after percutaneous coronary intervention (PCI) in a patient with aborted SCD. We identified the characteristics of the spasm portion in intravascular ultrasound (IVUS) images and conducted percutaneous cardiopulmonary bypass support-PCI with stenting as treatment. Intima and media thickening and a large attenuated plaque burden with rupture were identified in IVUS images at the obstructive spasm portion.
Long-Term Clinical Outcomes and Optimal Stent Strategy in Left Main Coronary Bifurcation Stenting
Cho, Sungsoo,Kang, Tae Soo,Kim, Jung-Sun,Hong, Sung-Jin,Shin, Dong-Ho,Ahn, Chul-Min,Kim, Byeong-Keuk,Ko, Young-Guk,Choi, Donghoon,Song, Young Bin,Hahn, Joo-Yong,Choi, Seung-Hyuk,Gwon, Hyeon-Cheol,Hong Elsevier 2018 JACC. Cardiovascular interventions Vol.11 No.13
<P><B>Abstract</B></P> <P><B>Objectives</B></P> <P>This study sought to investigate the long-term clinical effects of stent generation and stent strategy for left main coronary artery (LMCA) bifurcation lesion treatment.</P> <P><B>Background</B></P> <P>Limited data are available to assess long-term clinical outcomes after stenting, including use of current-generation drug-eluting stent (C-DES) for treatment of LMCA bifurcation lesions.</P> <P><B>Methods</B></P> <P>A total of 1,353 patients who were recorded in 2 multicenter real-world registries were treated by either early-generation drug-eluting stent (E-DES) (n = 889) or C-DES (n = 464). Primary endpoint was major adverse cardiovascular events (MACE). MACE was defined as a composite of cardiac death or myocardial infarction, stent thrombosis, and target lesion revascularization rates during 3-year follow-up. The authors further performed propensity-score adjustment for clinical outcomes.</P> <P><B>Results</B></P> <P>During 3-year follow-up, the overall MACE rate was 8.7%. Use of a 1-stent strategy resulted in better clinical outcomes than use of a 2-stent strategy (4.7% vs. 18.6%, hazard ratio [HR]: 3.71; 95% confidence interval [CI]: 2.55 to 5.39; p < 0.001). Use of C-DES resulted in a lower MACE rate compared with using E-DES (4.6% vs. 10.9%, HR: 0.55; 95% CI: 0.34 to 0.89; p = 0.014), especially for the 2-stent strategy. For patients with C-DES, the presence of chronic kidney disease and pre-intervention side branch diameter stenosis ≥50% were significant independent predictors of MACE.</P> <P><B>Conclusions</B></P> <P>Intervention of LMCA bifurcation lesions using DES implantation demonstrated acceptable long-term clinical outcomes, especially in C-DES patients. Use of a 1-stent strategy resulted in better clinical benefits than using a 2-stent strategy.</P>
( Sungsoo Cho ),( Tae Soo Kang ) 영남대학교 의과대학 2018 Yeungnam University Journal of Medicine Vol.35 No.1
Coronary spasm generally occurs in patients with minimal atherosclerotic plaque lesion, and it has a rather favorable prognosis. However, in some cases, coronary spasm may induce myocardial infarction and even sudden cardiac death (SCD). Here, we report a case in which multi-vessel intractable coronary vasospasm suddenly occurred in a diffuse atherosclerotic lesion after percutaneous coronary intervention (PCI) in a patient with aborted SCD. We identified the characteristics of the spasm portion in intravascular ultrasound (IVUS) images and conducted percutaneous cardiopulmonary bypass support-PCI with stenting as treatment. Intima and media thickening and a large attenuated plaque burden with rupture were identified in IVUS images at the obstructive spasm portion.
IPTV 단말 프로비저닝 절차의 구현과 표준화에 관한 연구
조성수(Sungsoo Cho),김경열(Kyoungyoul Kim),최현기(Hyungi Choi),김형수(Hyoungsoo Kim) 한국통신학회 2012 韓國通信學會論文誌 Vol.37 No.12(융합기술)
IPTV 서비스의 활성화를 위해 IPTV 단말의 사업자 이동성 확보 방법이 제기되었다. 사업자 이동성이 확보되면 서비스 이용자가 IPTV 단말을 시중에서 직접 구매 후 자신이 서비스를 제공받고자 하는 사업자를 스스로 선택하여 IPTV 서비스를 제공받을 수 있다. 이를 위해, IPTV 단말은 서비스를 제공받기 전 일련의 프로비저닝(provisioning) 과정을 거쳐야 한다. 한국정보통신기술협회(이하 TTA)는 IPTV 단말의 프로비저닝 절차에 관한 표준 기술 규격인 TTAK.KO-08.0026[1]을 제정하였다. 본 논문에서는 이의 개정 문서인 TTAK.KO-08.0026/R2[2]의 내용과 그에 기반하여 구현한 IPTV 단말 프로비저닝 시스템의 구성, 기능, 동작 절차, 파라미터 및 이슈 사항 등에 관해 소개하고, IPTV 단말 프로비저닝 절차의 파급 효과와 표준화의 발전 방향에 대해 논하고자 한다. To boost the IPTV industry, it has being considered to provide terminal portability from one service provider to another for users. If the terminal portability is guaranteed, then a service user can purchase an IPTV terminal in a market and select an IPTV service provider. For this, the IPTV terminal should process a series of pre-configuration, so called provisioning procedure. Telecommunications Technology Association (TTA) established the standard of IPTV terminal provisioning procedure, TTAK.KO-08.0026. In this paper, we explain the revised standard TTAK.KO-08.0026/R2, and introduce the architecture, functions, operating procedures and parameters of the IPTV terminal provisioning system that we implemented based on it. Finally, we discuss the future issues of the standard of the IPTV terminal provisioning procedure.
Yong-Joon Lee,Yongsung Suh,Jung-Sun Kim,Yun-Hyeong Cho,Kyeong Ho Yun,Yong Hoon Kim,Jae Young Cho,Ae-Young Her,Sungsoo Cho,Dong Woon Jeon,Sang-Yong Yoo,Deok-Kyu Cho,Bum-Kee Hong,Hyuckmoon Kwon,Sung-Jin 대한심장학회 2022 Korean Circulation Journal Vol.52 No.4
Background and Objectives: Identifying patients with high bleeding risk (HBR) is important when making decisions for antiplatelet therapy strategy. This study evaluated the impact of ticagrelor monotherapy after 3-month dual antiplatelet therapy (DAPT) according to HBR in acute coronary syndrome (ACS) patients treated with drug eluting stents (DESs). Methods: In this post-hoc analysis of the TICO trial, HBR was defined by 2 approaches: meeting Academic Research Consortium for HBR (ARC-HBR) criteria or Predicting Bleeding Complications in Patients Undergoing Stent Implantation and Subsequent DAPT (PRECISE-DAPT) score ≥25. The primary outcome was a 3–12 months net adverse clinical event (composite of major bleeding and adverse cardiac and cerebrovascular events). Results: Of the 2,980 patients without adverse events during the first 3 months after DES implantation, 453 (15.2%) were HBR by ARC-HBR criteria and 504 (16.9%) were HBR by PRECISE-DAPT score. The primary outcome rate was higher in HBR versus non-HBR patients (by ARC-HBR criteria: hazard ratio [HR], 2.87; 95% confidence interval [CI], 1.76–4.69; p<0.001; by PRECISE-DAPT score: HR, 3.09; 95% CI, 1.92–4.98; p<0.001). Ticagrelor monotherapy after 3-month DAPT was associated with lower primary outcome rate than ticagrelor-based 12-month DAPT regardless of HBR by ARC-HBR criteria, with similar magnitudes of therapy effect for HBR and non-HBR patients (p-interaction=0.400). Results were consistent by PRECISE-DAPT score (p-interaction=0.178). Conclusions: In ACS patients treated with DESs, ticagrelor monotherapy after 3-month DAPT was associated with lower rate of adverse clinical outcomes regardless of HBR, with similar magnitudes of therapy effect between HBR and non-HBR.