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서정환,이윤원,신용백 대한설비관리학회 1998 대한설비관리학회지 Vol.3 No.2
This study deals with development of quality test model on medical service and approve it to develope compatible method about the field of medical service. Through this study complementing sensibility element of environmental and emotional difference, It can give new establishment of quality concept and improve quality of medical service part.
의료서비스 품질측정모형의 제시와 지역별 의료품질 차이에 관한 연구 : 대도시 및 지방도시지역의 비교를 중심으로
서정환,이강원,신용백 대한설비관리학회 2001 대한설비관리학회지 Vol.6 No.4
There are two types of method in time series analysis ; time domain method and frequency domain method. This paper is concerned with the frequency domain method which is based on the assumption that a signal can be approximated by sinusoidal waves of different frequencies. The periodogram and sample spectrum are appropriate tools for analyzing the time series. The proposed procedure has four steps which are model identification, factor analysis, calculation of periodogram and determination of major period. This four-step procedure shows good capability for cyclical factor analysis of time series.
성공/비성공 벤처기업 창업자 성공요인 추출과 비교에 관한 연구
서정환,신용백 한국생산성학회 2002 生産性論集 Vol.16 No.1
World economies have rapidly developed to create the new economy and social structure, and the venture company play a important roles to improve the industrial structure and economy through the information society. In Korea, the venture companies become a major body for the re-jumping the economy by overcoming the current limitation of economy growth. This paper investigate the relationships between establisher's characteristics and company outcome of Korean venture companies that has different management environments than other countries. As the results, traditional and conservative technology development trend and market scale and adaptation (3.77) and secured market (3.70) were regarded as the important and critical success factors for the venture companies. Also, this paper suggested 'the model of success for venture establisher' that could be used as the references for the ones who are interested in venture establishment.
최영찬,김명환,서정환,변종훈,박태현,두창준 대한소화기내시경학회 1998 Clinical Endoscopy Vol.18 No.3
A 68-year-old man was admitted due to abdominal pain. He was diagnosed as having recurrent pancreatitis with a pseudocyst, which is communicated through the main pan- creatic duct. An endoscopic pancreatic sphincterotomy and insertion of a nasopancreatic tube into the main pancreatic duct via transpapillary drainage were performed. As a result, the pseudocyst disappeared and the pain was relieved. Thus it was concluded that transpapillary drainage via the main pancreatic duct is a safe and effective treatment for pancreatic pseudocysts, which is communicated through the main pancreatic duct.
김미영,최영찬,하상철,서정환,변종훈,박태현,두창준,진원종 대한소화기학회 1998 대한소화기학회지 Vol.31 No.2
Background/Airns: Approximately 30% of all patients who have spinal cord injuries have gastrointestinal symptoms. Gallstone disease is one of the causes. We performed the following study in order to determine the prevalence of gallstone disease among patients with spinal cord injury. Methods: We evaluated male patients who have spinal cord injuries. Abdominal ultrasonography, a detailed history and laboratory data were reviewed. In the study we excluded the patients with a history of obesity, hyperlipidemia, diabetes, gastric surgery, vagotomy, family history, liver cirrhosis, total parental nutrition, or of female sex. We evaluated 80 patients with spinal cord injuries and 82 controls. Results: Gallstone disease was significantly more prevalent in patients with spinal cord injury (18 of 80, 22.5%) compared to the control group (6 of 82, 7.3%). In the patients with spinal cord injury, the prevalence of gallstone disease was related with increasing age, but not the duration of injury, level of injured spinal cord and serum cholesterol. Conclusions: Spinal cord injury appears to be a risk factor for gallstone disease. But additional prospective studies are needed to confirm this association.