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설비배치계획용 시뮬레이터와 데이터베이스 연계를 위한 사용자 인터페이스 개발
문덕희,이춘식,장구길,황경현,신보성 한국경영과학회 1998 한국경영과학회 학술대회논문집 Vol.- No.1
There are two major phases in facilities planning, the first phase is selecting suitable facilities and the second is determining the layout of the facilities. These two phases should be considered simultaneously because of the interaction between them. Simulation is a useful tool for solving two phases iteratively. However, it is a difficult tool to the user who is not proficient in simulation modeling. This is a report of a development of the user interface that connect the layout simulator developed in SIMPLE++ and the DBMS containing necessary data for facilities planning. The developed system is applied to a shop manufacturing rubber-parts for automobiles.
철도차량 의장공장에서 흐름라인방식과 고정위치형 배치방식의 비교
문덕희,손동수,이영훈,신양우,Moon, Dug Hee,Son, Dong Su,Lee, Young Hoon,Shin, Yang Woo 한국시뮬레이션학회 2018 한국시뮬레이션학회 논문지 Vol.27 No.3
이 논문에서는 철도차량 의장공장에서 적용되는 두 종류의 배치안 개념에 대한 논의하고자 한다. 현재 시스템은 전통적인 흐름라인 방식에 따라 조립라인이 설계되어 있지만 새로운 시스템은 고정위치형 배치방식을 따르고자 한다. 시스템에 영향을 주는 요소로는 공정시간의 변동성, 결품률 및 결품시간의 분포를 고려하였다. 시뮬레이션 실험결과 해당시스템의 경우 생산량, 차량당 평균 체류시간, 편성당 평균 체류시간 모두 고정위치형 배치방식을 사용하는 것이 좋다는 결론을 얻었다. 또한 시스템의 고정위치형 방식이 흐름라인 방식에 비해 변화에 둔감하게 반응함으로써 강건성 측면에서도 우수하다는 결론을 얻었다. In this paper we will discuss two different layout concepts which can be applied to rail-vehicle assembly factory. The existing system is based on the traditional flow line, and the suggested system is based on the fixed position layout. The main factors which affect on the system performances are the variation of process time, shortage rate of part and the shortage period. Simulation experiments indicate that the fixed position layout is better with respect to the throughput, mean flow time per vehicle and the mean flow time per fleet. Furthermore, the fixed position layout is more robust than the flow line because performance measures are insensitive to the variations of factors.
문덕희,장구길 한국시뮬레이션학회 2000 한국시뮬레이션학회 논문지 Vol.9 No.2
For developing a new Tire Manufacturing Cell, the cooperation between the designer of facilities and the designer of system is very important. The purpose of this paper is to develop a simulation model that can be applied to the system design of Tire Manufacturing Cell. The mechanic characteristics of new facilities are obtained from facility design team and the simulation model is developed with SIMPLE++ using those input data. A model for estimating the number of tire drum required is also suggested and it is verified with numerical examples. The results of simulations can be fed back to the facility design team and used for modifying the structure of the facilities.
A Case Study of Simulation for the Design of Crankshaft Line in an Automotive Engine Shop
문덕희,허특,신우영,Moon, Dug-Hee,Xu, Te,Shin, Woo-Young 한국시뮬레이션학회 2008 한국시뮬레이션학회 논문지 Vol.17 No.2
자동차 엔진을 구성하는 주요부품은 실린더블록, 실린더헤드, 크랭크샤프트, 커넥팅로드, 캠샤프트 등으로 구성되는데 이들의 영문명을 따서 5C라고 부른다. 따라서 일반적으로 엔진공장은 5C를 생산하는 라인과, 엔진 조립라인을 포함하는 6개의 라인으로 구성이 된다. 엔진공장은 소품종대량생산의 특성을 가지기 때문에 장비의 배치형태는 흐름라인의 형태를 따른다. 본 논문에서는 국내 자동차 회사 엔진공장의 크랭크샤프트라인 설계를 위한 시뮬레이션 사례를 소개한다. 크랭크샤프트 라인은 기계가공을 중심으로 하는 라인이다. 따라서 라인설계에 영향을 미치는 요인들에 대해 소개하고, 라인 효율에 미치는 영향을 $QUEST^{(R)}$라는 3차원 시뮬레이션 도구를 이용하여 분석하였다. 기술팀에서 제시한 초기배치안에 대해 시뮬레이션 모델을 구축한 후 실험을 통하여 시스템 효율을 개선시키기 위한 방법을 제시하였다. The major components of an engine are the cylinder block, cylinder head, crankshaft, connecting rod, and camshaft, which are more popularly known as the 5 C's. Thus, the engine shop usually consists of six sub-lines, including five machining lines and one assembly line. The flow line is the typical concept of the layout when the engineer designs the engine shop. This paper introduces a simulation study regarding the new crankshaft machining line in a Korean automotive factory. The major factors for designing the machining line are considered, and their effects on the system performance are evaluated with a three-dimensional(3D) simulation model that is developed with $QUEST^{(R)}$. The initial layout is analyzed using the simulation model, and we suggest some ideas for improvement.
시뮬레이션을 이용한 작업자를 공유하는 병렬기계 작업장에서의 작업완료시간 최소화 문제 분석
문덕희,송성,정종윤 국립7개대학공동논문집간행위원회 2002 공업기술연구 Vol.2 No.-
In a semi-automatic machine shop, an operator usually handles more than one machine at a time, because the operator is free during the automatic running of a machine and he(or she) can serve another machine during that time. In this paper, we assume that there are several parallel machines handled by an operator, and one or more jobs already assigned to each machine. A job is defined as an order for producing given quantities of same part, because the shop adapts batch production. Thus in order to minimize makespan, both the visiting sequence of operator to the machines and the production sequence of jobs in each machine are considered. We suggest five heuristic visiting rules and eight production sequencing rules, because this problem is hard to formulate with mathematical program, and it is known as NP-hard. Thus, forty combinations are evaluated for the performance by numerical examples. Numerical example problems are selected randomly with uniform distributions and the performances of the combinations are evaluated by the simulation models which is developed for calculating makespan.