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선박 제조 공정 분야에서 수용접 대체를 위한 용접 로봇 시스템 도입의 적합성 분석 연구
권용섭,박창형,박상현,이정재,이재열,Kwon, Yong-Seop,Park, Chang-Hyung,Park, Sang-Hyun,Lee, Jeong-Jae,Lee, Jae-Youl 한국산업융합학회 2022 한국산업융합학회 논문집 Vol.25 No.5
Welding work is a production work method widely used throughout the industry, and various types of welding technologies exist. In addition, many methods are being studied to automate these welding operations using robots, but in the ship manufacturing field, welding such as painting, cutting, and grinding is also the most common operation, but the manual operation ratio is higher than in other industries. Such a high manual labor ratio in the field of ship manufacturing not only causes quality problems and production delays according to the skill of workers, but also causes problems in the supply and demand of manpower. Therefore, this paper analyzed the reason why the automation rate is low in welding work at ship manufacturing sites compared to other industries, and analyzed the production process and field environment for small and medium-sized ship manufacturing companies that repeatedly manufactured with a small quantity production method. Based on the analysis results, it is intended to propose a robot system that can easily move between workplaces and secure uniform welding quality and productivity by collaborating simple welding tasks with humans. Finally, the simulation environment is constructed and analyzed to secure the suitability of robot system application to current production site environment, work process, and productivity, rather than to develop and apply the proposed robot system. Through such pre-simulation and robot system suitability analysis, it is expected to reduce trial and error that may occur in actual field installation and operation, and to improve the possibility of robot application and positive perception of robot system at ship manufacturing sites.
권용섭,이현상,신재국,장병진,김형섭,신승철,허정호,양동헌,박헌식,조용근,채성철,전재은,박의현 대한심장학회 2004 Korean Circulation Journal Vol.34 No.12
We report here on a case of ascending aortic dissection combined with anterior myocardial infarction that was caused by a retrograde dissection into the left main coronary trunk and proximal left anterior descending artery. We successfully treated this with stenting of the left main coronary artery and proximal left anterior descending artery, and this allowed for the definitive surgical correction. Stenting a collapsed left main coronary artery can be lifesaving procedure and serve as a bridge to surgery.
권용섭,장재식,이창원,김동기,김웅,설상훈,김두일,조영완,진한영,서정숙,양태현,김대경,김동수 대한심장학회 2010 Korean Circulation Journal Vol.40 No.11
Background and Objectives: Plaque composition rather than degree of luminal narrowing may be predictive of future coronary events in high risk patients. The purpose of this study was to compare degree of plaque burden and composition with mul-tislice computed tomography (MSCT) angiography between diabetic and non-diabetic patients. Subjects and Methods: A total of 452 consecutive MSCT angiography examinations were performed between July 2007 and June 2009. Of these, the patients who underwent invasive coronary angiography were evaluated for the presence and type of atherosclerotic plaque and severity of luminal narrowing. Results: Ninety two (46 in the diabetic group and 46 in the non-diabetic group) patients underwent both MSCT angiography and invasive coronary angiography. Among them, 30 patients (65.2%) in the diabetic group and 26 patients (56.5%) in the non-diabetic group had significant coronary narrowing on MSCT angiography. Sixteen patients (34.8%) in the diabetic group and 15 patients (32.6%) in non-diabetic group underwent coronary angioplasty and stenting. Forty-two patients (93.3%) in the diabetic group and 39 patients (88.6%) in the non-diabetic group had multiple types of coronary plaque (p=0.485). MSCT angiography was similar to conventional coronary angiography in its ability to predict significant coronary artery disease in that the area under the curve was 0.88 (95% confidence interval, 0.81 to 0.95). Diabetic patients had more mixed plaque compared with non-diabetic patients. Conclusion: Differences in coronary plaque composition between diabetic and non-diabetic patients can be determined noninvasively by MSCT angiography. In patients with diabetes, mixed plaque types contribute to the total plaque burden to a higher degree than in non-diabetic patients.