• Journal of the KSME
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• v.35 no.4
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• pp.322-336
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• 1995

오늘날의 세계 시장에서는 그 경쟁이 점점 복잡해지고 있다. 이 경쟁에서의 승리는 적절한 시 기에 적절한 새모델을 제시하느냐에 달려 있다. 불행히도 제품설계 및 제조사이클에는 종종 많은 시간이 요구되는 루프가 포함되어 있다. 즉 설계변경과 재작업 사이클 때문에 시자출하 시간이 지연된다. 이러한 변화를 동적으로 취급하고 적절한 시점에 적절히 이동할 수 있는 전략을 개 발하는 것이 오늘날 세계경쟁에서의 성공에 필수적이다. 이러한 문제점들의 해결방안으로 동시 공학, 혹은 지식베이스 시스템을 포함하는 지식베이스 엔지니어링(KBE:knowledge-based engineering)이 소개되는데 이러한 지식베이스엔지니어링은 기존의 제품개발 방법론을 개선하기 위한 지능적인 설계도구로서 컴퓨터를 사용하는 새롭고 흥미로운 가능성을 제시한다. 이러한 설계도구는 조직적이고 체계적으로 지식을 수집하여 활용함으로써 동시공한(concurrent engineering)방법론을 효율적으로 수행하는 데에 매우 유용하다.

• Proceedings of the Korea Association of Information Systems Conference
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• 2004.11a
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• pp.182-190
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• 2004

공급사슬의 구성문제는 주문의 동적환경를 고려하여 전체 관점에서 스케줄링되어야 한다. 이러한 공급사슬구성문제를 본 연구에서는 에이전트 협상 방법론을 통해 해결하고자 한다. 에이전트 협상은 공급사슬망을 경쟁적 관계로 이해하고 개별목적을 가진 구성원 에이전트간의 협상과정을 통해 재스케줄링이 발생되어 공급사슬을 구성하게된다. 지금까지의 연구는 공급사슬 상에서 수직적 통합(vertical integration)을 중심으로 조직의 유연적 조정에 초점이 맞추어졌다. 그러나 본 문제에서는 구매자로부터 주문을 받기 위해 경쟁적 관계에 놓인 제조자가 도급계약(sub-contract)이 허용되는 환경에서 협력적 관계를 통해 개별적 이익을 최대화하는 동시에 공급사슬 전체의 관점에서도 비용 최적화를 이룰 수 있는 제조자 협상방법론을 제안하였다. 본 협상방법론을 통해 수평적 관계에 놓인 경쟁업체들의 협력적 관계 및 전략적 제휴의 중요성을 살펴볼 수 있다.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.29 no.3
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• pp.203-209
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• 2023

The increasing saturation challenges in storage facilities for Low- and Intermediate-Level Radioactive Waste call for a more efficient storage approach. Consequently, we have developed a square-structured container that features a storage capacity approximately 20% greater than that of conventional drum-type containers. Considering the need to contain various radioactive wastes from nuclear power usage securely until they no longer pose a threat to human health or the environment, this study focuses on evaluating the sealing efficacy of the newly designed rectangular container using finite element analysis. Since radioactive waste containers typically do not experience external forces except under special circumstances, our analysis simulated the impact of an external force, assuming a fall scenario. After fastening the bolts, we examined the vertical stress distribution on the container by applying the calculated external force. The analysis confirms the container's stable seal.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.40 no.5
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• pp.289-296
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• 2016

The availability of NMP, a solvent used in the manufacturing process of cathode material for lithium ion battery, depends on importation, and the price remains high because of the monopoly of BASF and ISP. For these reasons, most Lithium ion battery manufacturers reuse NMP after recovering it from the exhaust air in the drying process. In Korea, absorption method is mainly used for recovering NMP from the absorption tower using the hydrophilicity of NMP. However, this system has a few disadvantages, such as low purity (80％) of the recovered NMP and 100％ emission due to high water content of the treated gas. In this study, we develop a hybrid NMP recovery system by combining cooling condensation method with concentration method, by which it is possible to obtain an NMP recovery rate of 99.6％, and a high purity (96.1％) of the recovered NMP.

• Journal of the Korean Recycled Construction Resources Institute
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• v.10 no.4
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• pp.577-583
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• 2022

In this study, the characteristics of self-healing mortars produced using an inorganic self-healing material consisting of ground granulated blast furnace slag, expansion agent, and anhydrite, were investigated. For three types of self-healing mortars with different amounts of the inorganic healing material, compressive strength was measured and the self-healing performance was evaluated through the constant water head permeability test. The healing rate and equivalent crack width according to crack-induced aging were used as indicies of healing performance evaluation. Considering the development of compressive strength of the self-healing mortars, the change in the healing rate with healing periods, and the economic feasibility, the optimal amount of inorganic self-healing materials was suggested as 20 % of the mass of cement.

• Journal of Conservation Science
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• v.38 no.2
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• pp.154-165
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• 2022

The color appearance of cultural heritage are essential factors for manufacturing technique interpretation, conservation treatment usage, and condition monitoring. Therefore, this study systematically established color reproduction procedures based on the digital color management system for the portrait of Gwon Eungsu. Moreover, various application strategies for recording and conserving the cultural heritage were proposed. Overall color reproduction processes were conducted in the following order: photography condition setting, standard color measurements, digital photography, color correction, and color space creation. Therefore, compared with the color appearance, the digital image applied to a camera maker profile indicated an average color difference of 𝜟10.1. However, the digital reproduction result based on the color management system exhibits an average color difference of 𝜟1.1, which is close to the color appearance. This means that although digital photography conditions are optimized, recording the color appearance is difficult when relying on the correction algorithm developed by the camera maker. Therefore, the digital color reproduction of cultural heritage is required through color correction and color space creation based on the raw digital image, which is a crucial process for documenting the color appearance. Additionally, the recording of color appearance through digital color reproduction is important for condition evaluation, conservation treatment, and restoration of cultural heritage. Furthermore, standard data of imaging analysis are available for discoloration monitoring.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.1
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• pp.89-95
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• 2006

Planning distributed manufacturing logistics is one of main issues in supply chain management. This paper proposes a hybrid heuristic approach for the Multi-Level, multi-item Capacitated Lot Sizing Problem (MLCLSP) in supply chain network. MLCLSP corresponds to a mixed integer programming (MIP) problem. With integer variable solutions determined by heuristic search, this MIP problem becomes linear program (LP). By repeatedly solving the relaxed MIP problems with a heuristic search method in a hybrid manner, this proposed approach allocates finite manufacturing resources fur each distributed facilities and generates feasible production plans. Meta heuristic search algorithm is presented to solve the MIP problems. The experimental test evaluates the computational performance under a variety of problem scenarios.

• Journal of Distribution Science
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• v.6 no.2
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• pp.41-60
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• 2008

This study examined state of local pharmaceuticals industry and investigated distribution system. The study found out associated problems as well as improvements of distribution system of local pharmaceuticals. Finally, to improve distribution system of local pharmaceuticals, the study investigated distribution system of 10 kinds of pharmaceuticals of 'J' Company being a leading local manufacturer of local pharmaceuticals, and found out improvements of the distribution system. The study collected and compiled 'J' Company's internal slips and reporting material from April 1, 2008 to July 31, 2008, and interviewed persons in charge continuously to find out state and problems of the distribution system.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2018.10a
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• pp.34-34
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• 2018

천연물 산업은 과학적 기술력이 요구되는 고부가가치 산업으로 건강기능식품 등의 원료 산업으로 각광받고 있다. 최근 친환경, 지속가능성에 대한 관심 증가로 천연물 제품에 대한 수요가 증가되고 있으며 고령화 사회 진입과 건강에 대한 의식 수준 상승으로 전세계 건강기능 식품 시장 확대 추세에 있다. 생물자원의 70%이상을 수입에 의존하고 있는 우리나라는 천연물 산업의 경쟁력 확보와 고부가가치화 실현을 위해 천연물 산업 육성 촉진이 필요하다. 또한 지역 균형발전 측면에서 신성장동력 마련 및 국가 차원의 형평성을 고려한 전략적 투자가 필요한 시점에서 천연물 관련 산업의 신성장동력화를 통해 지역의 한계점 등을 개선하고, 새로운 먹거리 발굴과 함께 지역 전략산업으로 육성이 필요하다. 제천의 특화산업업인 한방천연물산업의 고도화와 활성화를 위해 영세한 스타트업 및 중소기업의 연구 및 제품개발을 지원하기 위한 인프라와 산업 클러스터 조성이 요구되고 있다. 제천은 풍부한 한약재 생산지를 보유하고 있어 전체 면적의 50% 이상이 석회암 지대로 알칼리성 토양이 넓게 분포되어 있고, 토양의 양분이 풍부하며 해발고도 250m 이상의 준산간 지역에서 주로 재배가 이루어지고 있어, 배수가 양호하고 병충해가 적어 한약재의 친환경 재배 및 다년생 한약재 재배가 가능한 지역이다. 이러한 천연물 산업을 육성하기 위하여 산업통상자원부, 충청북도, 제천시, (재)충북테크노파크는 180억원의 사업비로 '글로벌 천연물 원료제조거점시설'을 구축하여 규격화된 천연물 원료공급 시스템을 갖추었으며 150억원을 투자하여 '천연물 조직배양 상용화 시설'을 건립 중에 있다. 또한 향후에는 천연물 클러스터 가치 사슬의 완성형으로 160억 상당의 '천연물 제제개발 생산시설' 사업을 기획하고 있어 장차 대한민국의 천연물 산업을 앞장서 견인할 것으로 예상 된다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.16 no.5
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• pp.25-30
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• 2017

Carbon-fiber-reinforced plastic (CFRP) composite materials have been widely used in various industrial fields because the design variables can be adjusted according to the application of the required structure. Thermosetting and thermoplastic resins are used as the base materials of CFRP composites for the lightweight construction of automotive components. Thermoplastics have several advantages such as no curing and recyclability compared to thermosetting resin. In this study, CFRP composites were made using the Long-Fiber Thermoplastic-Direct (LFT-D) process. The LFT-D process includes an in-line production system that directly impregnates a thermoplastic resin, extrudes the composite material, and molds it. This process increases the strength and decreases the molding time. The tensile strength characteristics on the mechanical properties of CFRP were analyzed according to the parameters of LFT-D based on thermoplastics. To analyze the properties of CFRP, the specimens were prepared based on the tensile test standard ASTM 3039 of composite materials.