제품 및 공정의 설계와 개선을 위한 다구찌 방법은 제품의 품질향상을 위한 획기적 방법으로 최근 많은 관심의 대상이 되고 있다. 본 논문에서는 품질문제 해결을 위한 다구찌의 기본 전략을 종래의 전통적 개념과의 비교를 통해 소개하였으며, 구체적 방법으로서 직교배열에 의한 실험계획과 SN비를 바탕으로 한 파라미터 설계방법에 대해 다구찌의 견해와 다른 대안들을 함께 소개하고 앞으로의 연구방향에 대해 논의하였다.

This paper deals with enhancement of the high school equalization assignment system to be executed by the allied entrance examination after the applicants graduated from their middle schools. In prevailing opinion, because educational demander's will has not been considered under the current system, it whose merits have been covered is required to be improved. If the application system of the entrance examination for the high schools will be returned, a situation that it will result in irregularity of the middle school education and in overheating entrance examination seems to appear explicitly. Since the averages of the allied entrance examination score of all the high schools, achieved by the equalization-application nearest assignment system which is named by writers of this paper, are equal, our system is good for maintaining the merits of the current system. More than 50% educational demander's will has been reflected by our system, so that we come to the conclusion that our system is excellent in all the systems verified up to now. Assigning students to the high school to make an average difference between three and five score, we expect that relection rate of the educational demander's will be increased more than 60%.

생산계획이 수립되어 있는 상태에서 각 공정에 대한 구체적인 일정계획을 수립하였다. Group Technology를 이용하여 부품그룹을 형성하고, 흐름 생산형태의 GT라인으로 가공공정을 배치한 상태에서, Group Scheduling 기법을 활용하였다. 가공순서 결정 규칙으로 Petrov의 방법을 이용하였으며, 부품의 생산량을 고려하여 그룹간 가공순서와 그룹내 각 부품의 가공순서를 결정하였다. 이 과정을 전산화하여 실제로 이용할 수 있도록 하였다. 또한, Gantt Chart를 작성하여 각 공정의 부품별 가공 시작시간과 가공 완료시간을 계산하여, 작업지시는 물론 공정관리에 효과적으로 활용할 수 있도록 하였다. 컴퓨터 프로그램은 쉽게 실용적으로 활용할 수 있도록 하는데 중점을 두었다. 준비시간 및 가공시간에 대한 데이타는 업체에서 이미 사용하고 있는 생산정보 파일을 그대로 이용하거나, 그렇지 않는 경우 여러 용도에 맞도록 이 데이타를 파일로 작성하면 프로그램을 더욱 효율적으로 사용할 수 있으리라 기대된다.

The purpose of this thesis is to find the shortest path between two nodes on an acyclic network where the arc costs are determined by the starting time at the starting node of the arc. A branch and bound method for optimal solutions and a heuristic method is developed. In heuristic method Dijkstra algorithm is modified to maintain the minimum arrival times of maximum informations in the each time period at each node and is updated by the result with the insertion technique. Expermetal results among two methods are presented with regard to run time and solution qualities.

Flexibility, in the context of manufacturing, refers to an ability to accommodate changes in market requirements in terms of product, process, and other services in a timely manner at a reasonable cost. The basic purpose of this paper is to analyze manufacturing strategies of leading Korean manufacturers in order to answer the following questions : How important are manufacturing flexibilities to Korean companies in restoring their once competitive cost-based strategies and adopting new variety-based strategies\ulcorner How effectively are Korean companies competing with their foreign competitors, like the US and European companies in terms of manufacturing flexibilities\ulcorner And in order to improve the flexibilities what kinds of manufacturing capabilities are considered as important key factors by Korean manufacturers and are their action programs effectively implemented to acquire these capabilities\ulcorner Major findings of the analysis indicate that Korean companies are very eager to reorganize their high-volume, cost-based corporate strategies as low volume, variety-based strategies. However, Korean manufacturers are still much dependent on the large size high volume factories and / or 'focus factories'. And the action programs and technologies to improve manufacturing flexibilities have been actively implemented at a higher rate than those of their foreign counterparts.

Operational Research (OR) is little in Bangladesh in either the academic or the business areas. However, some OR studies have been carried out in Bangladesh. These studies are scattered in various journals and documents and are not all easily accessible. In this paper an attempt has been made to bring together some of them.