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철도여객수요예측을 위한 Holt-Winters 모형의 초기값 설정방법 비교
최태성(Tae-Sung Choi),김성호(Seong-Ho Kim) 한국철도학회 2004 철도저널 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.
철도차량소요계획에 대한 집합분할문제 접근에서 후보운용생성을 위한 열거알고리즘
김성호(Seong-Ho Kim),김동희(Dong-Hee Kim),최태성(Tae-Sung Choi) 한국철도학회 2004 철도저널 Vol.7 No.4
A routing is the path that an actual trainset follows as it moves from one train to another train in a timetable. The number of routings is equivalent to the number of trainsets required to cover the timetable. The primary factors of rolling stock requirement plan include evaluating the minimum number of routings. This can be formulated as a set partitioning problem and solved using enumeration method or column generation method. In this paper we presents an enumeration algorithm which is useful to implement the enumeration method for the rolling stock requirement plan.