• 산업공학
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• 제16권2호
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• pp.211-221
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• 2003

This paper introduces a simulation study regarding the design for the installation of Color Rescheduling Storage (CRS) in an automobile factory. In the painting shop the colors of vehicles are changed frequently according to the assembly schedule. When the color of a vehicle is changed from one to another, the cleaning process of painting-gun is necessary and it generates costs. Therefore many of the automobile manufacturers equip the CRS in front of the Top Coat Booth of the painting shop. The major objective of CRS is to reduce the change over cost in the painting process by grouping vehicles having same color. In this paper the configuration of CRS and the input/output algorithms are explained. The suggested system is verified using simulation models and experiments are conducted. Finally the best alternative is suggested by sensitivity analysis and evaluation of investment feasibility.

• 자원ㆍ환경경제연구
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• 제16권1호
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• pp.171-197
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• 2007

본 논문에서는 자료 제약의 현실적 상황에서 Porter 가설이 성립되기 위한 조건을 제시한다. 이를 위하여 기업의 생산비용 최소화 달성 여부에 관계없이 성립함으로써 분석결과의 신뢰성을 확보할 수 있는 두 유형의 산출물거리함수를 활용한다. Shephard 거리함수와 방향 거리함수, Shephard 거리함수로부터 공해물질의 한계저감비용을 구한 다음, Porter 가설이 내포한 생산기술이 전제되어 있는 방향 거리함수를 추정하여 얻은 한계저감비용과 비교한다. 국내 전력산업을 대상으로 1970~1998년 기간 동안 방향 거리함수에 의한 $SO_2$의 연평균 한계저감비용은 Shephard 거리함수 도출값보다 약 50퍼센트 높게 나타났는데 이는 Porter 가설이 성립하기 위해서는 새로운 발전시설과 공정에 투자하여 생산성을 평균적으로 50퍼센트 이상 향상시킬 수 있어야 함을 의미한다.

• 경영과학
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• 제16권1호
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• pp.157-171
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• 1999

In a increasingly competitive marketplace, the manufacturing companies have no choice but looking for ways to improve productivity to sustain their competitiveness and survive in the industry. Recently cellular manufacturing has been under discussion as an option to be easily implemented without burdensome capital investment. The objective of cellular manufacturing is to realize many aspects of efficiencies associated with mass production in the less repetitive job-shop production systems. The very first step for cellular manufacturing is to group the sets of parts having similar processing requirements into part families, and the equipment needed to process a particular part family into machine cells. The underlying problem to determine the part and machine assignments to each manufacturing cell is called the cell formation. The purpose of this study is to develop a clustering algorithm based on the neural network approach which overcomes the drawbacks of ART1 algorithm for cell formation problems. In this paper, a generalized learning vector quantization(GLVQ) algorithm was devised in order to transform a 0/1 part-machine assignment matrix into the matrix with diagonal blocks in such a way to increase clustering performance. Furthermore, an assignment problem model and a rearrangement procedure has been embedded to increase efficiency. The performance of the proposed algorithm has been evaluated using data sets adopted by prior studies on cell formation. The proposed algorithm dominates almost all the cell formation reported so far, based on the grouping index($\alpha$ = 0.2). Among 27 cell formation problems investigated, the result by the proposed algorithm was superior in 11, equal 15, and inferior only in 1.

• 한국항해학회지
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• 제23권1호
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• pp.29-43
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• 1999

The production process of the compound-curved hull plates includes hull design, definition, fairing, modeling, lofting, cutting, and forming in sequence. Traditional fabrication methods and shop environment caused low level to productivity in medium and small sized shipyards. The most effective solution to solve those problems is to rationalize the layout of facilities. For the well-balanced development of domestic shipbuilding industry, it is urgently required to reduce the gap between modernized large sized shipyards and traditional small and medium sized shipyards in production technologies and efficiencies. For the efficient and accurate hull piece forming, all information from design to forming should be clarified and organized in a systematic manner. Thus, management of the information plays an important role in the computerized and automated of hull piece forming. The object of this paper is to survey the status of the field, to find out the feasibility and to introduce a draft of hull piece fabrication line for small and medium sized shipyards. The development of required system follows the object oriented technology to extend to simulation based system for carrying out physical product flow and facilities layout analysis. It is feasible to operate such a modernized facility for a group of small and medium shipyards who are unable to have each of their own facility because of its large amount of initial investment and insufficient work load.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.1166-1172
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• 2003

The extremely strong competition among the world automobile industries has introduced the concept of PLM in the total production activities, one of whose major components is VM(Virtual Manufacturing). If the production lines are equipped with robots, the application of OLP in the virtual space is fully mature. However, in the point of the investment's and the maintenance's view, there are always some activities, which can not be automated: for example, typically the manual welding for prefixing in the automobile body shop and the material loading. Process planning for these activities, therefore, are decided mainly by experiences, which caused many repeated rework of the processes and the inconvenience of the workers, and resulted consequently in the reduction of the productivity and the safety of the workers. In this paper, the optimal dimension of the welding gun and its handle position and the optimal working path is simulated and decided by use of DELIMN/IGRIP and DELMIA/Ergo and the working area modelized in the virtual workcell of DELMIA.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.11-11
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• 2017

The most drought resistant among the five most important cereal crops, and a key dual-use (grain and biomass) crop in regions containing some of the world's most degraded soils, sorghum has inherent climate resilience that is likely to become more important under environmental conditions that are projected by many climate change models. The importance of sorghum might be further elevated by the development of productive genotypes that increase the extent and duration of soil cover beyond those of conventional annual crops, mitigating or even reversing losses of ecological capital through multiple crops from single plantings. Rich genetic and genomic resources have been developed to link Sorghum phenotypic diversity to its molecular basis, and in particular the genus has become a model for dissecting the molecular control of perenniality. Nature has made Sorghum perennial at least twice, and crosses between wild perennials and cultivated sorghums show the feasibility of developing genotypes with varying degrees of investment in perenniality while still providing harvestable food, feed, sugar and/or cellulose. Genetic analysis of progeny from these crosses is revealing the hereditary basis of traits related to ratooning and perenniality and providing diagnostic DNA markers. One perennial Sorghum species has adapted to continents and latitudes far beyond the reach of its progenitors, surviving stresses year after year that are only periodically experienced by conventional (annual) sorghum, and may also harbor novel alleles that may mitigate production challenges in conventional annual sorghums.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 추계학술대회 논문집 학회본부
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• pp.117-119
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• 1995

For an effective application of the cogeneration system for commercial and industrial buildings, we need to develop a relevant model to determine the long-term based optimal sizing of the cogeneration system considering electrical and thermal load demands, buy and sell contracts with electric utility and the annual production cost. In assessing the optimal sizing of cogeneration, we have to consider both economic parameters and their capacity expansion for the increased electrical and thermals demand in the future. In this paper, we propose a mathematical model for the optimal sizing of cogeneration systems considering annual production costs and other economic parameter such as, lifetime of the equipment, time value of the capital, etc. In the case study, we thoroughly examine the effects of the economic parameters and determine the optimal size of the sample system. In addition, we calculate the payback period of the cogeneration investment.

• 한국콘텐츠학회논문지
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• 제13권10호
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• pp.214-225
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• 2013

지난 십여 년간 놀라운 성장을 보인 한국 영화산업에 많은 기여를 해온 프로듀서의 시스템은 산업의 변화와 발전 과정에서 새로운 역할규정을 필요로 하는 시점에 접어들었다. 아이템을 개발하여 영화의 시나리오를 완성하고 감독과 배우를 패키징(Packaging)하는 기획개발과정은 영화의 완성도를 높이고 투자를 이끌어내는 것을 목표로 하는 매우 창의적이고 실제적인 과정이다. 본고는 미국 PGA(Producers Guild of America)의 "Produced By" 자격규정을 기준으로 한국영화 기획개발과정에서의 프로듀서의 역할과 문제점을 알아보고 이를 해결하기 위한 개선방안을 모색한다.

• World Technopolis Review
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• 제3권1호
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• pp.39-54
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• 2014

Recently, investment to basic science has been increased and infrastructure of science and technology has been expanded in developed countries like U.S.A, UK and Japan to foster high-tech industries. Science and research parks are built and under operation to acquire national competitive power and to activate regional economy over the world today. It is argued that more synergy effects are generated when science and research parks are operated in cooperation with related organizations and facilities such as firms, universities, research institutes and governments than it is operated by one organization. The aim of this paper is to develop a governance model of science and research parks. One comprehensive model and three individual governance models were developed according to the structure and relations of industry-science/research park-supporting organization interactions. When governance model of science and research parks is established and properly managed, national development capacity would be greatly enhanced through the acceleration of technology transfer, industrial production rise and enhancement of efficiency in the area of R&D and supporting system etc. One of the key factors in building governance system for science and research parks is establishing a control tower that supervises governance system comprehensively and systematically.

• Journal of the Korean Wood Science and Technology
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• 제33권1호통권129호
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• pp.97-110
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• 2005

본 연구는 최근 미국 에너지 시장에서 바이에너지가 차지하는 위치와 공급상황에 대하여 조사 연구되었다. 특히 제 1보에서는 미국에서 실용화되고 있는 목질 바이오매스를 이용한 바이오매스 전기제조기술(직접 연소 발전, 산업체의 폐열발전, 가스터빈과 스팀터빈 연합 발전 및 모듈화된 발전시스템등), 전기생산 시설 및 공급가의 경제성등에 대하여 검토하였고, 제 2보에서는 바이오매스 전기에 대한 미국의 정책 및 마케팅전략, 그리고 바이오매스 전기 사용이 가져오는 환경적 경제적 이익 및 발전 장벽(Benefit and Barriers)등에 대하여 조사 연구되었다.