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조문수,정병희,윤창원,Jo, Mun-Su,Jeong, Byeong-Hui,Yun, Chang-Won 제어·로봇·시스템학회 1997 제어·로봇·시스템학회 논문지 Vol.3 No.5
기존에 있는 그룹테크놀로지의 방법들은 기계와 부품간의 공정유사성이나 그밖의 다른 정의의 유사성을 갖고 한 가지 정도의 알고리즘이나 수학적인 모델로써 해를 구했으나 그 해들은 실질적으로 현대 산업의 생산시스템이나 자동화에서 풀어나가야 하는 기계들의 병목현상을 풀어나가는 직접적인 접근방법을 제시하지 못했다. 따라서 본 연구에서는 새로운 기계간 유사성의 개발과 그래프이론을 응용한 알고리즘 그리고 수학적인 모델을 동시에 응용해서 병목현상을 초래하는 예외적인 원소의 재배치를 효과적이고 쉬운방법으로 제시하였다.
정병희,윤창원 한국경영과학회 1995 經營 科學 Vol.12 No.1
The success of cell manufacturing applications in FMS rests on the effective cell formation to maintain the independent relations both between machine cells and between part families. This paper presents an integrated method for concurrent formation of cells and families with no E.E(Exceptional Element) in FMS with alternative routings. To determine the maximum number of cell and family with no E.E, mathematical conditions and properties are derived. New concept of nonsimilarity is introduced for each machine and part based on machine-operation incidence matrix and part-operation incidence matrix. To concurrently form the cells and families, integer programming based mathematical models are developed. For the predetermined number of cell or family, model Ⅰ is used to identify whether E.E exists or not. Model Ⅱ forms cells and families considering only nonsimilarity. But model Ⅲ can consider nonsimilarity and processing times The proposed method is tested and proved by using numerical examples.
셀 제조시스템에 있어서 비유사도를 이용한 기계셀과 부품그룹의 동시형성방법
윤창원,정병희,김민규 崇實大學校 生産技術硏究所 1994 論文集 Vol.24 No.-
The success of cell manufacturing applications in FMS rests on the effective cell formation to maintain the independent relations both between machine cells and between part families. This paper presents an integrated method for concurrent formation of cells and families with no E.E(Exceptional Element) in FMS with alternative routings. To determine the maximum number of cell and family with no E.E, mathematical conditions and theorems are derived. New concept of nonsimilarity is introduced for each machine and part based on machine-operation incidence matrix and part-operation incidence matrix. To concurrently form the cells and families, integer programming based mathematical models are developed. For the predetermined number of cell or family, model 1 is used to identify whether E.E exists or not. Model 2 forms cells and families considering only nonsimilarity. But model 3 can consider nonsimilarity and processing times. The proposed method is tested and proved using numerical examples.
양대용,정병희,윤창원 한국경영과학회 1994 經營 科學 Vol.11 No.1
This paper discusses the methodology for the operational performance of unit-load automated guided vehicles(AGVs) in a flow-shop-type flexible machining and assembly systems(FM /AS). Throughout the paper, AGVs are working as a carrier and mobile workstation. For a double-loop FM /AS, in which one loop is dedicated to machining and the other to assembly, three AGV operating strategies are proposed. Considering the entering interval and travel time of AGVs between workcenters, the strategies are developed to determine the best job sequence which minimizes the makespan and vehicle idle time. Entering times job sequence. When the number of AGVs are limited, entering times of times of AGVs are adjusted to maximize the utilization of AGVs.
기계중복과 셀간 이동수의 최소화가 가능한 예외적 요소의 제거 방법 : 비용 및 설치대수 제약 고려
장익,윤창원,정병희 한국경영과학회 1998 韓國經營科學會誌 Vol.23 No.4
Using the concept of cellular manufacturing systems(CMS) in job shop manufacturing system is one of the most innovative approaches to improving plant productivity. However. several constraints in machine duplication cost, machining capability. cell space capacity. intercell moves and exceptional elements(EEs) are main problems that prevent achieving the goal of maintaining an ideal CMS environment. Minimizing intercell part traffics and EEs are the main objective of the cell formation problem because it is a critical point that improving production efficiency. Because the intercell moves could be changed according to the sequence of operation, it should be considered in assigning parts and machines to machine cell. This paper presents a method that eliminates EEs under the constraints of machine duplication cost and cell space capacity attaining two goals of minimizing machine duplications and minimizing intercell moves simultaneously. Developing an algorithm that calculates the machine duplications by cell-machine incidence matrix and part-machine incidence matrix. and calculates the exact intercell moves considering the sequence of operation. based on the number of machine duplications and exact intercell moves. the goal programming model which satisfying minimum machine duplications and minimum intercell moves is developed. A linear programming model is suggested that could calculates more effectively without damaging optimal solution. A numerical example is provided to illustrate these methods.