• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2017년도 추계학술대회
• /
• pp.74-75
• /
• 2017

보관창고의 운영과 작업은 노동집약적으로 보관창고의 자동화는 기업의 생산형태의 변화와 구매자의 요구에 맞춰 작업시간을 단축하고 비용을 절감하기 위한 노력으로 이루어진다. 보관창고는 규모와 형태에 따라 여러 종류가 있으며 보관창고에서 사용되는 장비와 설비들도 목적과 용도에 따라 다양하다. 보관 자동화를 위해서는 운영시스템의 도입이 필수적이라고 할 수 있으며 이는 장비의 종류와 운영 방침에 따라 다양한 형태가 존재한다. 본 논문에서는 중소규모의 보관창고의 자동화를 위해서 필요한 요건들을 살펴보고 효과적인 자동화시스템을 도입하기 위한 장비 선택과 운영시스템의 선택사항들을 시나리오로 구분하도록 한다. 이에 따라 각 시나리오별로 시뮬레이션을 실시하여 자동화의 효과를 알아보고 자동화 도입을 위한 비용을 통하여 경제성 분석을 통해 자동화의 효과를 검증하도록 한다.

• 산업경영시스템학회지
• /
• 제34권2호
• /
• pp.9-18
• /
• 2011

Vender prioritization process is one of the most critical tasks of production and logistics management for many companies. Determining the most critical criteria for vender prioritization process is a vital means for a purchasing company to improve its supply chain productivity. This study discuss the use of a Fuzzy analytic network process (Fuzzy ANP) model which is an efficient tool to handle the fuzziness of the data involved in deciding the preferences of different criteria which are not independent. Also, the comparison of classical ANP and Fuzzy ANP is described using simulation with triangular distribution random number generation. It is shown that Fuzzy ANP model possesses some attractive properties and could be used as an alternative to the known vender prioritization methods.

• 산업경영시스템학회지
• /
• 제41권1호
• /
• pp.59-69
• /
• 2018

The up-to-date business environment for Korean manufacturers is very complex and rapidly changing. Especially, the companies have faced with various changes derived from small quantity batch production, diversification of customer demands, and short life cycles of products. Consequently, the Korean manufacturing companies are in need of more efficient production planning and scheduling techniques. In this paper, the research trend of scheduling techniques is investigated to provide relevant information to researchers in this field. Furthermore, some implications for future researches are presented regarding literatures published in Korea over the last 10 years. This paper presents an entire investigation into Korean research works on scheduling (2,569 papers) that are published from 2007 to 2016. Especially, detailed analysis was carried out in the following three industry : 1) semiconductor, 2) shipbuilding and 3) automobile. In this paper, approaches to scheduling presented in the literature are categorized into the following three categories : 1) application, 2) algorithm, and 3) simulation modeling. First, in the semiconductor industry, scheduling techniques related to semiconductor cleaning processes, photolithography processes, chemical processes, transport and transport equipment have been found to be dominant. Second, the shipbuilding industry is focused on assembly processes, transporter, crane and various existing production management system. On the other hand, the scheduling research of the automobile industry is mainly focused on the vehicle movement routing and procurement supply-chain planning algorithm in terms of logistics. The conclusion of this study are expected to provide many implications for various types of academic and practical follow-up studies related to scheduling in consideration of main characteristics of semiconductor, shipbuilding and automobile industries.

• 한국전자거래학회:학술대회논문집
• /
• 한국전자거래학회 1999년도 학술대회지 vol.1
• /
• pp.277-299
• /
• 1999

Since Chrysler Motor Co. had experienced the digital development system in the beginning of 1990's, most of leading automobile companies are trying to apply a digital information system for their own business process reengineering based upon concurrent engineering system from product planning phase. This is called as virtual DMU(Digital Mock-Up) system instead of the traditional PMU(Physical Mock-Up) system. By using the virtual prototype, all of the design requirements and system specifications can be checked, changed and optimized more quickly and more efficiently. This paper consists of five chapters for the DMU information system. In the 1$^{st}$ chapter, the principle of digital design system is suggested by using four basic modules such as product design module, process design module, manufacturing system design module and central control module. The basic scheme of DMU is introduced with the benefits of application in the chapter 2. In the chapter 3, a digital design process of new car development is explained with the detailed DMU design and design review processes. In the chapter 4, the practical DMU manufacturing techniques and applications are introduced as CAD/CAM analyses, DPA(Digital Pre-Assembly)reviews for development, production, operation and maintenance phases, digital tolerance analyses and digital factory analyses for assembling line simulation, automated robot welding processes, production jig ＆ fixtures and painting process simulation. Finally, the activities of digital design support; CAS-styling, CAE-engineering and CAT-testing are summarized for design optimization in the chapter 5. As today's automobile manufactures and related business organizations are struggling to compete in the global marketplace, they are concentrating on efficient use of DMU information system to reduce the new car development cost, to have shorten the delivery schedule and to improve product design quality. To meet the demand of those automobile industries on digital information systems, the CALS(Computer aided Acquisition and Logistics Support) and EC(Electronic Commerce)initiative has been focused as a dominant philosophy in defense ＆ commercial industries, specially automobile industries.s.

• 한국항해항만학회지
• /
• 제28권1호
• /
• pp.59-67
• /
• 2004

세계 경제의 글로벌화에 따른 국제물류의 환경변화로 세계 주요 항만은 각 권역에서의 물류거점 항만이 되기 위한 경쟁이 치열하게 전개되고 있다. 우리나라(한국)에서도 동북아지역에서의 지리적인 이점을 활용하여 새정부의 출범과 함께 국가차원에서 한반도를 동북아 물류 중심기지로 육성하기 위한 전략을 적극적으로 추진 중에 있다. 그 중 한가지 전략이 관세자유지역 지정을 통한 다국적 물류기업의 유치로 물류산업의 활성화 및 동북아의 국제물류기지로 육성할 계획이다. 그러나 세계 각국에 비해 후발주자인 부산항 관세자유지역에 세계적인 다국적 기업의 유치를 위해서는 중앙정부 및 지방정부의 많은 투자가 필요한 것이 현실이다. 따라서 본 연구에서는 중국 및 일본에 있는 업체의 설문 조사를 토대로 부산항 관세자유지역의 경쟁력을 분석하고 활성화 방안을 제시하는데 목적을 두고 있다. 컨조인트 분석을 통한 응답 업체의 선호도 조사결과 투자절차 및 제한이 36.2％로 가장 높은 선호도를 나타내고 있기 때문에, 관세자유지역에 기업을 유치하기 위해서 가장 중요시해야 할 전략은 투자절차 및 제한에 대한 문제점을 해결해야 한다. 시장점유율 시뮬레이션 분석을 통하여 경쟁력을 평가한 결과, 5개 국가중 UAE의 경쟁력이 가장 높고 한국은 가장 낮은 것으로 나타났다. 그러나 투자절차 및 제한과 생산요소 비용의 현재 수준을 개선시켰을 경우에는 5개 국가중 UAE 다음으로 경쟁력이 높은 것으로 나타났다. 따라서 부산항 관세자유지역이 경쟁력을 가지기 위해서는 투자절차 및 제한에 대한 개선뿐만 아니라 생산요소 비용에서도 기업들이 만족하는 수준으로 절감되어야 한다는 것을 알 수 있었다.

• 산업경영시스템학회지
• /
• 제39권3호
• /
• pp.30-38
• /
• 2016

Shuttle-Based Storage/Retrieval System (SBS/RS) is relatively new to industry. The system is in the category of Automated Storage/Retrieval System (AS/RS), but it is different in that the SBS/RS uses shuttles as Storage/Retrieval (SR) machine instead using a stacker crane. The shuttles are assigned to each tier on multi-tier system and operated for pick-up or drop-off order. Since the system can handle multiple orders simultaneously, it can provide much higher throughput than that of general AS/RS with single stocker crane. Thus, this new system is well fit to recent tendency of increasing small quantity batch production and orders. One of the drawback of this system is that it needs a lot of investment to set up. The efficient operation of the system would be one of the critical matters to increase economic efficiency of capital investment. In this study, we focused on the dwell point policy for shuttles to find efficient way of operating the system. There are four basic policies for the dwell point and we had simulation-based experiment for two different scenarios based on the speed of the shuttle and inter-arrival time of the loads coming to the system combined with four different policies. As it was mentioned above, this SBS/RS relatively new to the field and there is no such experiment shown on previous research and the study of dwell point policy for this SBS/RS could provide the direct comparison of each policy with different hardware specification; the capability of the system. The policy that achieves most efficient operation among the given environment is proposed and the usability of the system is discussed.

• 한국포장학회지
• /
• 제29권2호
• /
• pp.129-138
• /
• 2023

The proportion of agricultural products handled through the Agricultural Products Processing Center (APC) is also steadily increasing every year, and in the case of Seongju Korean melon, a total of 10 APCs of Nonghyup and farming association corporations are in operation, and the distribution ratio is about 60% based on total production. In this study, Seongju Korean melon was selected as a target to analyze the environment load during carrying (production farm ~ APC) in the production area and the transport environment load during distribution of domestic fruits, and to analyze the environmental load for handling at APC. The vertical average vibration intensity (overall G_rms of 1~250 Hz) of truck transport measured at three transport routes from Seongju Korean melon producer ~ APC, Seongju ~ Seoul and Seongju ~ Jeju was about three times larger than that in the lateral direction and 4.5 times larger than that in the longitudinal direction, respectively. The frequency of occurrence of high-amplitude events (G) in the vertical direction compared to the measuring time was deeply related to pavement conditions in the order of unpaved farm-roads, concretepaved farm-roads, and asphalt-paved main-roads, but overall G_rms for the entire frequency band is believed to have a greater impact on vehicle traveling speed than road conditions. On the other hand, the difference in the size and direction of the vibration intensity measured by the forklift truck's main-body and the attachment (fork carrier) during handling at Seongju Korean melon APC was clear, and the vibration intensity of the forklift truck's main-body was largely affected by the stiffness of the fork and the mast according to the handling weight. Based on the field-data of the transport environment during domestic distribution measured through this study, it is believed that it is possible to develop a lab-based simulation protocol for appropriate packaging design.

• Journal of Computational Design and Engineering
• /
• 제1권2호
• /
• pp.140-151
• /
• 2014

Storing, and the loading and unloading of materials at production sites in the manufacturing sector for mass production is a critical problem that affects various aspects: the layout of the factory, line-side space, logistics, workers' work paths and ease of work, automatic procurement of components, and transfer and supply. Traditionally, the nesting problem has been an issue to improve the efficiency of raw materials; further, research into mainly 2D optimization has progressed. Also, recently, research into the expanded usage of 3D models to implement packing optimization has been actively carried out. Nevertheless, packing algorithms using 3D models are not widely used in practice, due to the large decrease in efficiency, owing to the complexity and excessive computational time. In this paper, the problem of efficiently loading and unloading freeform 3D objects into a given container has been solved, by considering the 3D form, ease of loading and unloading, and packing density. For this reason, a Group Packing Approach for workers has been developed, by using analyzed truck packing work patterns and Group Technology, which is to enhance the efficiency of storage in the manufacturing sector. Also, an algorithm for 3D packing has been developed, and implemented in a commercial 3D CAD modeling system. The 3D packing method consists of a grouping algorithm, a sequencing algorithm, an orientating algorithm, and a loading algorithm. These algorithms concern the respective aspects: the packing order, orientation decisions of parts, collision checking among parts and processing, position decisions of parts, efficiency verification, and loading and unloading simulation. Storage optimization and examination of the ease of loading and unloading are possible, and various kinds of engineering analysis, such as work performance analysis, are facilitated through the intelligent 3D packing method developed in this paper, by using the results of the 3D model.

• 한국정보처리학회논문지
• /
• 제3권1호
• /
• pp.1-8
• /
• 1996

골판지 제조업체의 특성은 다품종 소량 가공산업이며, 단납기, JIT(Just In Time) 성의 산업으로서 고객의 서비스 요구를 충족시키며 기업의 이윤을 극대화하기 위해서 는 무엇보다도 철저한 물류 유통관리를 통한 물류비 절감이 중요하다. 특히 공장 내부에서 물류는 각 공정들의 가동율 및 생산성 향상에 막대한 영향을 미치고 있다. 최근 골판 지 제조업체들은 공정간의 물류를 효율적으로 운영하여 가동율을 높이고, 공정사의 재고 를 최소화시키는 역할을하는 컨베이어 시스템에 관심을 갖게 되었다. 그런데 본 사례 의 컨베이어 시스템은 컨베이서의 적체와 종종 수작업 운영으로 인하여 시스템의 목적을 달성할 수 없는 문제점이 발견되었다. 제조시스템의 성능평가에는 경제적, 정성적, 그리고 기술적 평가방법이 있다. 본 연구는 기술적 평가방법중 시뮬레이션을 통하여 골판지 제조업체의 컨베이어 시스템의 성능을 평가 하는 것이다. 컨베이어 시스템에서 고루게이터 및 제상기 공정의 가동율, 컨베이어의 적재율의 문제점을 해결하는 각 대안에 대한 시뮬레이션을 통하여 예상 적재량, 공정들의 가동율 등의 결과를 분석하 였다. 최적방안으로 컨베이어를 추가 설치하고, 공정들의 가동시간을 조정하는 대안을 제시하였다.

• 유통과학연구
• /
• 제14권5호
• /
• pp.107-114
• /
• 2016

Purpose - Loading can decrease the productivity due to the possibility of carrying out with the opposite order of storage in container terminal. When the container is to be taken out, it is needed to move the container stacked upon the container to be carried out to other place temporarily. It is called as rehandling. Remarshalling, with the loading plan, is the arranging the containers before the ship arrives in order to avoid the rehandling during the carrying out. The present study tried to find out the factors affecting the efficiency when building the remarshalling plan with the utilization of neighboring storage space as a outer slot, and analyzed the efficiency of several remarshalling algorithms with the combination of those factors. Research design, data and methodology - The present study used, when the remarshalling plan is prepared for utilizing the outer slot, the simulation methods in order to compare the efficiency of the remarshalling algorithms which made with the factors affecting the efficiency. The factors affecting the efficiency are the method of making the child node, method of arrangement, and possibility of application of FIX. In order to analyze the affecting factors on the efficiency, several algorithms are prepared with the combination of production of the child node and the arrangement method with the availability of FIX application. With this algorithm, the effect of the factors on the efficiency after building up of remarshalling plan with the target on the bay with 10 rows, 8 columns, and 10 indices. Results - The method of rearrangement and making of a child node as the factor affecting the efficiency of remarshalling utilization of the outer bay were studied. It is efficient to combine the method of making a child node with MCS in order to reduce the number of moving the containers. For reducing the time in carrying out, it was found that all arrangement methods should be combined with RCS for the efficiency. The result of experiment shows the application of FIX with good result in case of succession ratio. In addition, when FIX was not applied, all of the most combinations resulted in short time in remarshalling. As a result, it can be concluded that the algorithm with proper combination of making the child node and the arrangement can increase the job efficiency based on the importance. Conclusion - The present study suggested and analyzed the algorithms with the combination of the arrangement method, the making of child node, and FIX. It is needed to develop the algorithm to judge the possibility whether the best remarshalling plan can be built or not within the bay in order to find a better method between the two cases such as within the bay and outer the bay. As a method for extending the study on the factors affecting the efficiency, it is possible to find out the way to build the remarshalling plan within the permitted time under any storage situation.