• 산업경영시스템학회지
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• 제20권42호
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• pp.193-200
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• 1997

For the industrialized nations, the manufacturing industries have becomes increasingly difficult to meet customers' demands and complete on the international market. Thus, manufacturing industries must be able tn react quickly to prevailing market conditions and to maximize the utilization of resources. Within recent years, computer technology, in conjunction with software technology, has made available to the manufacturer tools which can greatly improve their reaction to a new market situation, speeding up the design of products, improving process planning, maximizing resource scheduling, and streamling production flow through factories. This paper investigate "CALS" systems for motor's companies. The purpose of this study is to give some ideas of finding a better way of constructing "CALS" system in Korea motor's companies.a motor's companies.

• 대한안전경영과학회지
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• 제5권2호
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• pp.155-164
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• 2003

In this regard, the newly focused logistics information system makes reducing the expenses of whole logistic available by cutting down the expenses of materials, transportation and stock and also, it allows the company to cut down the procurement expense through the reduced lead-time and rationalize producing plans by eliminating the uncertain orders and fluctuation in procurement. It further more optimizes the efficiency of over all productions by meeting the dead line for delivery to the customers. In the recent environment of globalization where fierce competitions exist between manufacturers, logistics plays important role in the strategies of companies, and managements of companies try their best efforts in establishing the strategy to accomplish the innovative relationship between supply chain channels. Therefore, in this study, we try to suggest the model of consolidated logistics system that is integrated logistics information system with suggesting the better way of logistics and comparative analysis with logistics system to resolve the difficulties numbers of companies face after realizing what logistics information system is in Korea.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2010년도 춘계학술대회
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• pp.219-230
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• 2010

Remarkably improvements have occurred recently in the maintenance management of physical assets and productive systems, so that less wastages of energy and resources occur. The technology of maintenance is about finding and applying cost-effective ways of avoiding or overcoming performance deterioration. Maintenance is thus a vital support function in business, especially as increasingly large investments are being required in physical assets. TPM(Total Productive Maintenance) focuses on optimizing planning scheduling. Availability, performance and quality rate are other factors that affect productivity. Especially there are some losses that affect the overall equipment effectiveness(OEE). These losses lead to low values of OEE, which provides an indication of how effective the production precess is. This study explores the ways in which Korean small and medium manufacturing industries can improve OEE.

• 경영과학
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• 제24권1호
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• pp.35-43
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• 2007

Minimizing the total number of setup changes of a machine increases the throughput and improves the stability of a production process, and as a result enhances the product qualify. In this context, we consider a new product-mix problem that minimizes the total number of setup changes while producing the required quantities of a product over a given planning horizon. For this problem, we develop a mixed integer programming model. Also, we develop an efficient heuristic algorithm to find a feasible solution of good quality within reasonable time bounds. Computational results show that the developed heuristic algorithm finds a feasible solution as good as the optimal solution in most test problems.

• 대한산업공학회지
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• 제22권4호
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• pp.619-631
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• 1996

This paper describes an approach for the incorporation of maintenance times into a hierarchical scheduling for a failure prone flexible manufacturing system. The maintenance should not be performed too often because of the resulting reduction of capacity. Most manufacturing systems are large and complex. It is natural to divide the control into a hierarchy consisting of a number of different levels. Each level is characterized by the length of the planning horizon and the kind of data required for the decision making process. The goal of the analysis reported here is to calculate the production requirements while the machines fail and are repaired at random times. The machine failure and preventive maintenance are considered simultaneously.

• 산업공학
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• 제13권2호
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• pp.246-252
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• 2000

As moulds and dies are manufactured through complex processes under the make-to-order production environment, it is very difficult that the manufacturing activities as like observance of the due date, trace of the progress, etc are controlled with a real time. In this paper, a schedule-planning system using the commercial software Microsoft Project 98 is developed to control the procedures of mould and die manufacturing with real time. Once an initial schedule is planned from the BOM information in the intranet, it is rescheduled by data collected from machines on the shop floor. The system is suitable to medium- or small-sized manufacturing companies as well as large-sized ones, because it can be installed with a low cost.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.223-224
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• 2023

Optimal fleet management in the planning stage is one of the most critical activities that guarantee successful construction projects. In South Korea, the construction standard production rate database (CSPRD) is normally employed. However, when it comes to a trade-off problem that involves decision-making on optimal sets of equipment to perform a certain task, the method will require the planners' in-depth knowledge and experience regarding the target process and a time consuming estimation of the performance of every possible scenario must be conducted for the deduction of the optimal fleet management. On this account, this research paper proposes a lightweight method of using mixed integer nonlinear programming (MINLP) in multi-objective problems based on CSPRD-based mathematical equations to assist planners in the preplanning stage of choosing the optimal sets of types and size machinery to efficiently arrange the construction scheduling and budgeting.

• 산업경영시스템학회지
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• 제43권1호
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• pp.143-150
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• 2020

To enhance the effectiveness of the FMS (flexible manufacturing system), it is necessary for the manufacturing control system to be upgraded by integrating the cyber and the physical manufacturing systems. Using the CPPS (Cyber-Physical Production System) concept, this study proposes a 4-stage vertical integration and control framework for an aircraft parts manufacturing plant. In the proposed framework, the process controller prepares the operations schedule for processing work orders generated from the APS (advanced planning & scheduling) system. The scheduled operations and the related control commands are assigned to equipments by the dispatcher of the line controller. The line monitor is responsible for monitoring the overall status of the FMS including work orders and equipments. Finally the process monitor uses the simulation model to check the performance of the production plan using real time plant status data. The W-FMCS (Wing rib-Flexible Manufacturing Control & Simulation) are developed to implement the proposed 4-stage CPPS based FMS control architecture. The effectiveness of the proposed control architecture is examined by the real plant's operational data such as utilization and throughput. The performance improvement examined shows the usefulness of the framework in managing the smart factory's operation by providing a practical approach to integrate cyber and physical production systems.

• 대한조선학회논문집
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• 제31권1호
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• pp.42-49
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• 1994

조선 CIM 시스템은 제품 모델을 중심으로 한 정보의 통합화를 중점적으로 추구하여야 하므로, 이 제품 모델을 기능 모델과 형상 모델로 구분하였다. 조선을 위한 제품 모델의 근간이 되는 형상 모델을 오일러 조작을 기초로 하는 비다양체 모델의 자료 구조를 이용하여 각각 구획 배치, 구조 설계 및 공정 계획의 입장에서 이용하는 방법에 대하여 연구하였다.

• 한국산림과학회지
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• 제82권3호
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• pp.292-304
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• 1993

이 연구에서는 대단지 산림자원의 수확벌채계획(收穫伐採計劃) 수립을 위한 선행계획 전산모델의 기초체계를 제시하였다. 모델에서 사용한 선형계획수식화모형은 비감소수확(非減少收穫)에 허용증감율을 적용하여 목표림의 유도, 최소 목재공급의 한계 및 최대 벌채면적의 한계와 같은 산림생산 제약조건들을 포함하고 있다. 이 모델에서는 Model I 및 Model II 기법에 의한 선형계획 수식화가 가능하고, Matrix 출력은 MPS 양식에 의한다. 전산모델 개발에 있어서 선형계획기법에 의한 산림자원 경영분석방법론(經營分析方法論)의 타당성(妥當性)은 문헌고찰에 의해 이미 국내에 소개된 바 있는 감반율법(減反率法) 및 이분검색법(二分檢索法)의 해법특성(解法特性)과의 비교고찰(比較考察)을 통해 검토하였다. 또한 제시된 모델체계의 적용성은 대규모 산림자원 경영계획을 수렵하기 위한 사례분석을 통해 검토하였다. 사례분석을 위한 연구대상지로 서울대학교 남부연습림 백운산지역(약 11,000ha)을 선택하여 위에서 제시된 산림생산(山林生産) 제약인자(制約因子)들을 동시에 만족시킬 수 있는 최적벌채계획(最適伐採計劃)을 수립하고, 목재생산 제약인자들의 강도에 대한 영향력을 분석하였다.