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徐洵根 동아대학교 공과대학 부설 한국자원개발연구소 1982 硏究報告 Vol.6 No.1
This paper deals with cost projections and net cash flow estimations adjusted for learning relating to financial plannings. A model is developed for investment decisions which incorporates a labor cost function to express the effects of employee learning during the start-up phase and is extended during the steady-state phase of production. The accounting treatment for a cost allocation based on the learning curve phenomenon is discussed and sensitivity analysis to asses the impacts of estimation errors in the learning rate and steady-state production time is explored. Finally an example to demonstrate the feasibility of proposed model and its methodology is illustrated.
徐洵根,鄭原基 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2
This paper presents an economic model to determine producer's tolerance factor of a quality characteristic with 100% screening inspection on the assumptions of continuous quadratic loss function and linear inspection cost. A solution procedure for the optimum tolerance is developed and illustrated with a numerical example. Taguchi's tolerance determining procedure have been analyzed in the framework of western statistical quality control although Taguchi has derived tolerances with the consideration of quadratic loss function and deterministic quality characteristic.
순 방사형 물류체계에서 수송장비의 보유대수 결정과 분배정책 : 복합포아송과정을 따를 경우 The Case of Compound Poisson Process
서순근,이병호 한국경영과학회 1999 韓國經營科學會誌 Vol.24 No.3
Fleet sizing and empty equipment redistribution are two of the most critical problems in managing a fleet of equipment over a transportation network. Where the demand pattern followed the compound Poission process(CPP) which can be generated one or more at a time under homogeneous Poissio process(HPP), this paper presented a mathematical model to determine control parameters of a decentralized distribution policy and fleet size. In case of the pure hub-and-spoke system, a popular form of a logistics system, and validated this model by simulation. That is, where the number of demanded equipments followed geometric and binomial distribution, respectively, cost models on the pure hub-and-spoke logistics system with deterministic transportation time, which could be solved analytically, were established and analyzed. We also compared the deterministic case with stochastic one that the transportation time follows some probability distributions.
서순근,이성재 한국품질경영학회 2001 품질경영학회지 Vol.29 No.3
This paper deals with problem of determining process target value under automated visual inspection(AVI) system. Three independent error sources - digitizing error, illumination error, and positional error - which have a close relationship with the performance of the AVI system, are considered. Assuming that digitizing error is uniformly or normally distributed and illumination and positional errors are normally distributed, respectively, the distribution function for the error of measured lengths is derived when the length of a product is measured by the AVI system. Then, Optimal target values under two error models of AVI system are obtained by minimizing the total expected cost function which consists of give away, rework and penalty cost. To validate two process setting models, AVI system for drinks filling process is made up and test results are discussed.
서순근,김갑석,배봉수 동아대학교 공과대학부설 생산기술연구소 1996 生産技術硏究所硏究論文集 Vol.1 No.2
The assumptions of period checking policy for On-Line Quality Control presented by Taguchi are examined and his loss function and formulae are evaluated by simulation. New iterative procedures are proposed under Taguchi's loss and improved loss functions, respectively. Computational experiments are conducted for various combinations of parameter values and their results are discussed. Sensitivity analysis for assumption of random walk model is also illustrated with an example.