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최태성,김성호 인하대학교 산업경제연구소 1997 경상논집 Vol.11 No.1
Measuring the relative efficiency of bank branches is a major issue of great con-cern to bank administrators. Data envelopment analysis (DEA) which is suggested by Charnes, Cooper and Rhodes(1978) can be used to assist in evaluating the branches' performance and suggest ways to improve the quaity of service provided. Additionally, it may be used to assess the need for resources redistribution. In this paper, the DEA is used to evaluate the efficiency of branches of bank and assess the need for resources redistribution. The results of the study will help the bank administration to evaluate the performance of branches and take the necessary corrective actions.
최태성,김형기,김성호 한국경영과학회 2002 한국경영과학회지 Vol.27 No.2
In this paper, we compares the business failure prediction accuracy among Linear Programming Discriminant Analysis (LPDA) model. Multivariate Discriminant Analysis (MDA) model logit analysis model. The data for 417 companies analyzed were gathered from KIS-FAS published by Korea Information Service in 1999. The result of comparison for four time horizons shows that LPDA is advantageous in prediction accuracy over the other two models when over all hit ratio and business failure accuracy are considered simultaneously.
직업적 디메틸아세트아미드(Dimethylacetamide) 노출에 의해 집단적으로 발생한 독성간염
최태성,우극현,김진석,박완섭,함정오,정상재,유재영 대한산업의학회 2001 대한직업환경의학회지 Vol.13 No.2
목적 : DMAC에 노출된 후 집단적으로 발생한 독성 간염 7례보고. 방법 : 2000년 2월 신설된 스판덱스 섬유제조 공장에 근무하는 생산직 근로자 178명중 2000년 2월 부터 8월까지 7명이 간장질환이 발생하였다. 환례들의 나이는 23∼47세였고, 남자 5명, 여자 2명이었다. 이들에 대해 혈액검사, 간 초음파 검사 등의 임상검사와 작업장 조사를 실시하였다. 결과 : 근무 부서는 중합 1명, 방사 1명, 권취 4명, 그리고 포장 1명이며 평균근무기간은 10주였다. 주 호소 증상은 심한 피로감, 어지럼증 및 황달이었고, 검사실 소견상 독성간염의 소견을 보였다. A, B 및 C형 간염 표지자 검사는 모두 음성이었고, 간초음파 소견상 특이 소견이 없었다. 문진 상 알코올 성 간염을 일으킬 정도의 음주력이나 최근 약물 복용력을 가지고 있는 환례는 없었다. 입원 후 보존적인 치료로 모두 급속히 호전되었다. 초기에 발생했던 환례에서 퇴원후 DMAC에 재 노출되어 독성 간염이 재발되었다. 이후 모든 환례들은 퇴원 후 DMAC 비노출 부서로 전환하였고, 퇴원후 지속적인 추적검사에서 간 효소 수치가 완전히 정상화되었고, 정상화되는 기간은 1∼2개월 정도 소요되었다. 결론 : 환례들의 임상증상, 검사결파, 노출력 및 과거력상 DMAC에 의한 독성간염으로 추정된다. Dimethylacetamide is widely used in the production of plasics, resins, synthetic fibers, and gums and in purification and crystallization processes. Inhalation of the vapor or skin absorption of the liquid of dimethylacetamide (DMAC) can cause liver damage. Toxic hepatitis possibly attributable to DMAC exposure occurred in seven works among 178 employees who had worked on a new spandex-fiber production line. A large amount of DMAC is used as a spinning solvent for synthetic fibers in the factory. The patients were aged 23-47 years old and composed of five males and two females. They were involved in the process of polymerization(1 patient), spinning(1), take-up(4) and packaging(1). The mean duration of exposure was 10 weeks. They experienced fatigue, dizziness and jaundice. The patients showed elavated total bilirubln, alanlne aminotransferase (ALT), and aspartate aminotransferase (AST) levels. The serologic test for viral hepatitis A, B and C were negative, as were the abdominal ultrasonographic scans. Based on the presumptive diagnosis of DMAC-induced toxic hepatitis, they were removed from the workplaces. One or two months after removal from the work, the transaminase levels returned to normal. The patients had no history of significant alcohol use, blood transfusion, recent medication, and drug abuse. As a result, authors could not find any attributable cause of toxic hepatitis but the toxicity by DMAC exposure.
철도여객수요예측을 위한 Holt-Winters모형의 초기값 설정방법 비교
최태성,김성호 한국철도학회 2004 한국철도학회논문집 Vol.7 No.1
Railway passenger demand forecasts may be used directly, or as inputs to other optimization models use them to produce estimates of other activities. The optimization models require demand forecasts at the most detailed level. In this environment exponential smoothing forecasting methods such as Holt-Winters are appropriate because it is simple and inexpensive in terms of computation. There are several initialization methods for Holt-Winters Model. The purpose of this paper is to compare the initialization methods for Holt-Winters model.