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중소신발생산기업의 생산시스템 개선을 위한 시뮬레이션 모형 개발
신병철(Shin Byung-Chul),조형수(Cho Hyung-Soo),이달상(Lee Dal-Sang) 동의대학교 정보통신연구소 2004 정보통신연구지 Vol.5 No.-
A production system in domestic shoes companies has difficulty in achieving automation and information because of insufficiency of flexibility and standardization. Particularly small and medium sized shoes companies producing by OEM has chased imminent production schedule, and consequently the production schedules or the process conditions can not be optimally set and are extemporized by the experience in the past. These behaviors mainly cause lowering of productivity and fmancial loss. To maximize efficiency and productivity of the shoes process, in this paper, we develop a simulation model based on a production system in small and medium sized shoes companies. Using the simulation model, we find out several problems and inefficiencies for process or management system, and then make a best counterproposal.
담낭절제술후의 내시경적역행성담췌관조영술의 진단소견과 치료
김원석(Won Seok Kim),조형철(Hyung Chul Cho),조장현(Jang Hyun Cho),추진호(Jin Ho Chu),김명원(Myung Won KIm),오기창(Ki Chung Oh),강명원(Myung Won Kang),임연근(Yun Kun Lim),여향순(Hyang Soon Yeo),박홍배(Hong Bae Park) 대한내과학회 1998 대한내과학회지 Vol.54 No.5
Objectives: Accurate assessment of the retained or recurrent bile duct stone is important in postcholecys-tectomy patients who have signs of cholangitis or other pancreatobiliary disease. This study was performed to evaluate the diagnostic and therapeutic reliability of endoscopic retrograde cholangiography in posteholecystectomy patients. Methods: From October 1975 through August 1995, we reviewed 311 patients retrospectively who had undergone on cholecystectomy, Our study was based on assessment of their age, sex, symptoms and physical findings, comparison between sonographic and endoscopic retrograde cholangiographic findings, and stone removal rate using endoscopic sphincterotomy, basket, electrohydraulic lithotripsy. Results: The ratio of male to female was 1:1.67, and the mean age was 56±14.3 years. After cholecystectomy, they visited our clinic within 2 years in 25 patients (8.4%), beyond 2 years in 286 patients (91.6%). Most common symptoms and physical findings were epigastric pain or tenderrs (63.6%). We detected bile duct stone using endoscopic retrograde cholangiography 219 patients. In case of the bile duct stone, we successfully removed it using endoscopic sphincterotomy, basket, electrohydraulic lithotripsy in 194 patients (88.6%). Conclusion: From the above results, we concluded that endoscopic retrograde cholangiography was the most effective diagnostic and therapeutic method in postch-olecystetomy patients who have signs of cholangitis.
PV연계 ESS의 최적 사업모델 및 용량 산정을 위한 설계 프로그램
조경희(Kyeong-Hee Cho),김슬기(Seul-Ki Kim),조형철(Hyung-Chul Jo),손완빈(Wanbin Son),김응상(Eung-Sang Kim),박준호(June Ho Park) 대한전기학회 2020 전기학회논문지 Vol.69 No.9
Under the Korea government’s Energy Transition Roadmap, energy transition is underway with the gradual reduction of nuclear power plants and the expansion of renewable energy. Moreover, in the Third Energy Master Plan, the target share of renewable energy by 2040 was increased to 30-35%. The increase in the capacity of small-and medium-sized photovoltaic power stations (PV) is the highest among different renewable energy sources. As the output of PV power stations varies considerably, linking them with energy storage systems(ESSs)is attracting attention. When designing a PV-ESS, as the investment costs are high and the applicable support policies vary with the purpose of operation, it is important to review the economic feasibility of various models before installation. However, conducting this review might be very complex and difficult for the operator. Accordingly, the present study introduces a design program for distributed resources (MODDER) that can select the optimal capacity and business model considering the domestic policies and the operating characteristics of the distributed resources. The program comprises a database of weather information, load patterns according to application, sales unit costs, electricity rate unit costs, and renewable energy system specifications and can conveniently analyze the economic feasibility of a PV-ESS by selecting and configuring it according to the user’s purpose. Accordingly, the program helps determine the optimal capacity and business model. To verify the effectiveness of the proposed program, through a case study, simulations of a demand side management business and a renewable energy generation sale business were conducted based on actual industrial customers, and the results were analyzed. The developed program can be used to maximize the return on investment of renewable power generation and ESSs, thereby reducing investment risk and contributing to improving the acceptance of renewable energy.