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강경식,나승훈 명지대학교 공학기술연구소 1991 공학기술연구소 논문집 Vol.6 No.-
This paper present how to analyze and determine the Econcmic Lot Range (ELR) using mathematical approach. The ELR is determined by the two limits of lot size which is upper limit and lower limit. The range is wide enough to provide a great flexibility in management decision. A functional relationship between total cost and lot size is estabilished through the use of sensitivity analysis.
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STS 316 스테인리스 강의 고온 피로 균열성장에 미치는 하중 및 인장유지 시간의 효과
강경식,임병수 成均館大學校 科學技術硏究所 1999 論文集 Vol.50 No.1
As high temperature equipments are operated under the cycle composed of start-up, steady operation and shut down procedures, cracks existing in the components usually experience fatigue loading of trapezoidal waveshapes. An investigation has been conducted to evaluate the effects of load and hold time on high temperature fatigue crack growth in STS 316 stainless at 650℃. High temperature fatigue crack propagation experiments conducted under the load condition of 230 and 270MPa. and conducted over a wide range of hold times of 0, 0.1, 1 and 10 hours for each load condition. The results of this study can he summarized as follows : (1) As load increased from 230MPa to 270MPa and tensile hold time from 0 to 10 hours, average load line displacement rate per cycle and average crack growth rate per cycle increased gradually. (2) For prediction of creep damage, a linear superposition model was adopted. In the case of 0.1, 1 hour tensile hold time, the predicted creep crack growth rate was greater than the practical creep crack growth rate, which proved that creep-fatigue interaction had existed.
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康景植,閔雄基 명지대학교 공학기술연구소 1987 공학기술연구소 논문집 Vol.2 No.-
This paper is to show how to determine the optimal Lot Sizing Rules in a hierarchical Production System. Four selective Lot Sizing Rules, shown excellent among those 9 Lot Sizing Rules in recent studies, are evaluated in terms of production and inventory cost. Six typical demand patterns are generated, and unit production costs and set-up costs are considered as a function of different levels of production system. Also were calculation the total cost of 16 Lot Sizing Sequence generated by the permutation of the four selective rules. Decisions are made on the optimal Lot Sizing Rules at the minimum total cost. Since the total cost varies as a function of the lot size, the upper and lower limit of the lot size is to be estimated within the range of the tolerance level of the total cost. The Economic Lot Range, which the variation of the total cost is negligible, is determind by the two limits of the lot size. Experimentation shows the range is wide enough to provide a greater flexibility in management decision. As the lot size spans from its lower to upper limit, the corresponding penalty costs occur. A functional relationship between total cost and lot size is established through the use of sensitivity analysis. Then the suggested model lays down new criteria by which the penalty cost is optimal.
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康景植,柳志喆 명지대학교 1987 明大論文集 Vol.18 No.-
Classifying the types of forcasting method broadly, they are quantitative method appropriate for long-range forcasting, casual method for short and medium-range forcasting, and time series method for short-range forcasting. In this paper, Winters’ Method in time series method will be considered that are useful for forcasting time series, which has seasonal and trend.
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강경식,오영수,나승훈,김태호 명지대학교 공학기술연구소 1992 공학기술연구소 논문집 Vol.7 No.-
본 논문은 재공품 재고를 줄이기 위한 방법으로서 유사성 계수법의 도입에 관하여 서술하였다. 특히 J.R.King의 이론과 Nakornchai의 ROC-2 이론을 비교 하였다. 그 결과로서 ROC-2의 이론은 적은 기계 혹은 부품에서와 같은 시스템에 사용하는 것이 유리하며 또한 기계나 부품의 그룹화가 서로 독립적으로 수렴되지 않아도 된다는 장점이 있다. This paper reprented that work-in-process inventory has been decreased with the application of the similarity coefficient algorithm. Especially, J.R.King's ROC and Nakornchal's ROC-2 algorithm is studied. The analyzed resuits in this paper are as ROC and ROC-2 algorithm have an adventage that it can be used in production system which has many machinary and component and an arbitrary threshold value should be define and many grouping are being performed independently.
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