• 산업경영시스템학회지
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• 제17권31호
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• pp.115-123
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• 1994

Group scheduling, which is a kind of operations scheduling based on the GT concept is analyzed in a multi-stage manufacturing system. The purpose of this research is to develop and evaluate a heuristic algorithm for determining gro up sequence and job sequence within each group to minimize a complex cost function, i.e. the sum of the total pe-nalty cost for tardiness and the total holding cost for flow time, in a multi-stage manufacturing system with group setup time dependent upon group sequence. A heuristic algorithm for group sc heduling is developed, and a numerical example is illustrated. For the evaluation of the pro-posed heuristic algorithm, the heuristic solution of each of 63 problems is compared with that of random scheduling. The result shows that the proposed heuristic algorithm provides better solution in light of the proposed cost function.

• 산업경영시스템학회지
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• 제5권6호
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• pp.69-78
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• 1982

Traditional CVP (Cost-Volume-Profit) analysis employs linear cost and revenue functions within some specified time period and range of operations. Therefore CVP analysis is assumption of constant labor productivity. The use of linear cost functions implicity assumes, among other things, that firm's labor force is either a homogenous group or a collection homogenous subgroups in a constant mix, and that total production changes in a linear fashion through appropriate increase or decrease of seemingly interchangeable labor unit. But productivity rates in many firms are known to change with additional manufacturing experience in employee skill. Learning curve is intended to subsume the effects of all these resources of productivity. This learning phenomenon is quantifiable in the form of a learning curve, or manufacturing progress function. The purpose d this study is to show how alternative assumptions regarding a firm's labor force may be utilize by integrating conventional CVP analysis with learning curve theory, Explicit consideration of the effect of learning should substantially enrich CVP analysis and improve its use as a tool for planning and control of industry.

• 품질경영학회지
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• 제22권3호
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• pp.66-84
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• 1994

The investment to advanced manufacturing techniques is essential to reinforcement of furture competitiveness. To make a decision for selecting an appropriate manufacturing facility is very important ; it is, however, rather difficult to get a precise evaluation through conventional cost analysis methods. The supreme decision-maker does not only take into consideration tangible cost attributes in decision-making ; he also takes into account such intangible attributes as strategic ones. This study combines Analytic Hierarchy Process and Simulation in order to graph the variations of weighted indices of alternatives for effective decision making when cost attributes are uncertain. A numerical example is illustrated to explain the basic mechanics of the proposed decision procedure.

• 산업경영시스템학회지
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• 제18권33호
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• pp.39-43
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• 1995

The purpose of this article was to understand the individual proportion of quality costs which have been expended by manufacturing industries in Seoul and Kyunggido district. The collected data on 72 firms could be use for an empirical analysis and the ratio test was implementented with the questionnaires. The finding were as following : by conparison with the proportion of quality cost in typical manufacturing industrial of U.S., We concluded that total quality cost was occupied with a small portion of sale. Also as compared with the individual item of quality cost, it was noted that the proportion of prevention cost had increased in a relatively large company.

• 산업공학
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• 제13권3호
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• pp.378-387
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• 2000

As the globalization of manufacturing companies continues, the scope of dependence between these companies and distributors, and other suppliers are growing very rapidly since no one company manufactures or distributes the whole product by themselves. And, the need to increase the efficiency of the whole supply chain is increasing. This paper deals with a multi-plant lot-sizing problem(MPLSP) which happens in a decentralized manufacturing system of a supply chain. In this study, we assume that the whole supply chain is driven by a single source of independent demand and many levels of dependent demands among manufacturing systems in the supply chain. We consider setup cost, transportation cost and time, and inventory holding cost as a decision factor in the MPLSP. The MPLSP is decomposed into two sub-problems: a planning problem of the whole supply chain and a lot-sizing problem of each manufacturing system. The supply chain planning problem becomes a pure linear programming problem and a Generalized Goal Decomposition method is used to solve the problem. Its result is used as a goal of the lot-sizing problem. The lot-sizing problem is solved using the CPLEX package, and then the coefficients of the planning problem are updated reflecting the lot-sizing solution. This procedure is repeated until termination criteria are met. The whole solution process is similar to Lagrangian relaxation method in the sense that the solutions are approaching the optimum in a recursive manner. Through experiments, the proposed closed-loop hierarchical planning and traditional hierarchical planning are compared to optimal solution, and it is shown that the proposed method is a very viable alternative for solving production planning problems of decentralized manufacturing systems and in other areas.

• 융합정보논문지
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• 제7권4호
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• pp.215-220
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• 2017

본 연구는 회계정보시스템의 적용 정도가 국내 중소제조기업들의 제조원가개선에 미치는 영향을 파악하는데 목적이 있다. 본 연구를 위하여 중소기업청이 시행하는 정보화 지원 사업을 통하여 정보시스템을 도입한 바가 있는 국내 중소제조기업의 회계담당자들을 대상으로 설문조사를 실시하여 경험적 연구를 진행하였다. 연구결과에 의하면 기업은 회계정보시스템을 효율적이고 효과적으로 구현하고 있으며, 회계정보시스템이 제조원가의 편차를 상당 부분 파악하고 있다는 것으로 나타났다. 또한, 회계정보시스템의 효율성 및 제조원가의 향상에 회계정보시스템의 채택 및 구현이 긍정적인 영향이 있음을 보여주었다. 본 연구는 회계정보시스템의 효율성을 증대시켜 국내 중소제조 기업들의 제조원가 향상에 많은 도움을 주는 것에 기여할 것이다.

• 한국산학기술학회논문지
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• 제7권2호
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• pp.238-245
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• 2006

본 연구는 제조기업에서 업무 상 비용절감과 처리속도를 빠르게 할뿐만 아니라, 향후 업무환경 변화에 능동적으로 대처할 수 있는 통합 경영관리시스템을 설계하는 데 있다. 현재 판매되고 있는 범용 경영관리시스템은 많은 추가적인 노력없이는 각 기업의 고유업무를 반영하는 데에 한계점이 있으므로, 본 연구에서는 예측생산 및 주문생산 전략을 동시에 가지는 자동차부품 제조업체를 대상업체로 선정하여 해당업체의 업무에 특화하여 경영관리시스템을 설계하였다. 시스템설계는 전체 시스템의 각 기능 모듈에 대하여 불필요한 업무처리의 발생을 줄이기 위한 장치를 추가함으로써 제품원가에 반영되는 제조 간접비의 발생을 최소화하도록 하였다. 또한 구축될 시스템에 현장상황이 적시에 반영되어 시스템의 출력이 실효성을 가질 수 있도록 하기 위해 각 기능 모듈간의 연계성을 고려하였으며 현장상황을 관찰하는 모니터링 모듈과 각 기능모듈간의 데이터 흐름을 원활히 할 수 있도록 시스템을 설계하였다.

• 산업공학
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• 제14권2호
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• pp.120-126
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• 2001

Virtual manufacturing is a technology facilitating effective development and agile manufacturing of products via sophisticated computer models representing physical and logical schema and behavior of real manufacturing systems including manufacturing resources, environments, and products. Based on these models, virtual manufacturing supports decision making and error checking in the entire manufacturing processes from design to mass production. At first, we analyzed manufacturing preparation activities of the four major production shops such as press, body assembly, painting and final assembly, of a Korean automotive company. We then developed the workflow models out of the analysis by the IDEF methodology, and generated a strategic plan for the systematic application of the virtual manufacturing technologies. We identified many manufacturing preparation activities that can be improved by the application of virtual manufacturing technologies. Finally, we estimated the effect of improvement including time savings in car development processes and corresponding cost savings.

• 산업경영시스템학회지
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• 제24권64호
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• pp.77-83
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• 2001

In this paper, we investigated the relationship between the variables related to manufacturing environment and industrial accident. Also we wish to analyze how much these variables influence in production result of company: the manufacturing performances such as production quantity, quality, cost and delivery. For this investigation, we collected the real data from 16 small/medium-sized manufacturing companies by performing a questionnaire survey and one-site interview with the workers. Sixteen companies were made up of the following four industries: metal processing, machinery manufacturing, chemical products manufacturing and electronic products manufacturing, The data analysis was made using SPSS PC+. Based on the result of the analysis, we came to the conclusion that most of variables related to manufacturing environment and industrial safety were connecting with industrial accident occurrence and also influenced in manufacturing performance.

• 산업경영시스템학회지
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• 제17권31호
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• pp.43-48
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• 1994

In an effort to become more competitive and cost efficient many companies have shifted from traditional job-shop production to production using group technology (GT) and cell manufacturing (CM). Cellular manufacturing is critical to implementing Just-in-Time (JIT) production which pointed out in the previous articles. and adopt the U-shaped cell which allows for entry at one end of the U and exist at the other. This paper looks at the availability of cellular manufacturing, by applying those concepts to the small and medium sized industry.