• 대한안전경영과학회지
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• 제19권1호
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• pp.203-210
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• 2017

Companies are pursuing the management of small quantity batch production or JIT(Just-in-time) system for improving the delivery response and LOB(Line Balancing) in order to satisfy consumers' increasing demands in the current global economic recession. And in order to improve the growth of production for reducing manufacturing cost, improvements of the Load Balancing have become an important reformation factor. Thus this paper is aimed at warehouse which procures materials on the assembly line in procurement logistics of automotive logistics and proceed with research on heuristic algorithm development which can increase the Load Balancing of workers. As a result of this study, when applied the primary target value, it was verified that the whole workers decreased from 28 to 24. Furthermore, when specified the secondary target value and applied algorithm once more, it was verified that the Load Balance Ratio was improved from 44.96% to 91.7%.

• 산업경영시스템학회지
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• 제44권4호
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• pp.145-153
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• 2021

Automated Guided Vehicle (AGV) is commonly used in manufacturing plant, warehouse, distribution center, and terminal. AGV is self-driven vehicle used to transport material between workstations in the shop floor without the help of an operator, and AGV includes a material transfer system located on the top and driving system at the bottom to move the vehicle as desired. For navigation, AGV mostly uses lane paths, signal paths or signal beacons. Various predominant sensors are also used in the AGV. However, in the conventional AGV, there is a problem of not turning or damaging nearby objects or AGV in a narrow space. In this paper, a new driving system is proposed to move the vehicle in a narrow space. In the proposed driving system, two sets of the combined steering-drive unit are adopted to solve the above problem. A prototype of AGV with the new driving system is developed for the comparative analysis with the conventional AGV. In addition, the experimental result shows the improved performance of the new driving system in the maximum speed, braking distance and positioning precision tests.

• 대한안전경영과학회지
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• 제19권3호
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• pp.123-128
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• 2017

Logistics companies distinguish between medium-sized business and small business according to the size of enterprises. Of course, conglomerates are called global corporations. In this study, mid-sized companies over a certain size or more and those below are classified and decide the priorities among important factors to secure competitiveness in logistics companies are determined through AHP technique. Mid-sized companies are companies that can provide more than two logistics services. For example, they provide warehousing and transportation services in the same time. small companies are companies that can mostly provide one functional service. Warehousing, transportation, manpower, and information are listed as factors in this study. As a result of the study, medium-sized companies emphasized on the importance of transportation. When it comes to small companies, warehousing was emphasized as an important factor. Due to the simultaneous and contemporary service of warehousing and transportation in small-sized company, the reliable image of the company will be underestimated in case of delays in transportation. Competitiveness will also be weakened. Global corporations or conglomerates will start to consider relocating warehousing areas to others except for the central storage hub. They won't plan to invest directly, either. Therefore, it will be possible to secure competitiveness by providing the function of warehousing and to signed easily partnership.

• 디지털융복합연구
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• 제16권9호
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• pp.1-10
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• 2018

창고형 매장의 성장이 가속화되면서 창고형 매장에 대한 물류의 중요성도 증대되고 있다. 이러한 측면에서 본 연구는 GIS를 사용하여 C사의 Depot 통합운영 후 운송 효율성을 분석하였다. Depot 통합에 따른 컨테이너 출고 물동량 변화를 분석한 결과, 배송시간 측면에서는 Depot 1개를 운영 할 경우 연간 총 1,028,699km 운행이 필요한 것으로 분석되었고, 이는 Depot 3개를 운영할 때 연간 총 2,866,604km 운행이 필요한 상황과 비교할 경우, 연간 1,028,699km 감소가 되는 것을 확인할 수 있다. 배송시간 측면에서도 Depot 1개를 운영 할 경우 일일 62시간의 시간절감과 전체적으로 36%의 절감효과를 기대할 수 있었다. 본 연구는 GIS OD Matrix를 이용하여 Depot 통합과 컨테이너 배송전환에 따른 운영 프로세스 개선, 운송시간 및 거리 절감효과를 제시하였다. 본 연구의 결과는 다른 창고형 할인매장의 배송 프로세스에 영향을 줄 수 있는 중요한 판단지표로 활용될 수 있다.

• 한국IT서비스학회:학술대회논문집
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• 한국IT서비스학회 2007년도 춘계학술대회
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• pp.330-335
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• 2007

국가 간 무역 활성화로 인하여, 국제 물류의 고도화가 요구되는 현 시점에서 보세창고의 운영 효율성을 제고할 필요성이 커지고 있다. 그러나 현재의 보세창고 프로세스 중 검수 및 장치화물관리 프로세스는 수작업으로 인한 오류발생률이 높아 효율성이 저하되는 문제점을 가지고 있다. 따라서 본 논문에서는 이에 대한 해결책으로 보세창고에 RFID 기술을 적용하여 검수작업을 자동화하는 방안을 제시하였다. RIFD 기술 도입은 검수 작업의 효율화뿐만 아니라, 향후 실시간 장치화물관리, 창고 내 Resource 관리 등 창고관리의 제 분야에 활용되어 보세창고관리의 효율성을 제고시킬 것으로 기대된다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2009년도 공동학술대회
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• pp.149-150
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• 2009

The problem of vehicle routing problem(VRP) with pair operations of pick up and delivery are well-known in real applications in logistics networks, as in planning the routes for automatic guided vehicles(AGVs) in an automatic container terminal(ACT), warehouses or in some just-in-time services. This paper will present a formulation to modeling the problem mathematically which can be used to generate optimal routes of carried vehicles in the field to reduce the incurred cost of moving goods. This selected model could be used in (semi-)automatic short-term planning systems for vehicle fleet working in ACT, or in modern warehouses which the long list of requests is parted and sorted in preprocessing orders systems.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2022년도 봄 학술논문 발표대회
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• pp.67-68
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• 2022

Foreign countries stipulate that ventilation and smoke control facilities are installed in logistics warehouses. On the other hand, in Korea, the design guidelines and standards of ventilation and smoke control facilities for logistics warehouses are not clear even in the situation where the number of human casualties caused by smoke has increased until recently. Accordingly, the smoke descent time according to the vent was calculated. As a result, when there was no vent, the smoke descent time was 369s. On the other hand, when the vent was installed, smoke did not fall because the amount of smoke was greater than the amount of smoke generated.

• 디지털융복합연구
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• 제16권5호
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• pp.55-63
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• 2018

중국 물류 산업에 큰 변화가 있었음에도 중국 물류의 연구 동향에 대한 연구는 거의 이루어지지 않았다. 기존 연구는 운송 효율성, 창고 위치 및 항만 효율 등과 같은 세분화된 주제로 연구가 진행되었다. 본 연구에서는 2000년부터 2017년까지 중국 물류의 연구 동향을 SNA방법을 이용하여 분석하였다. 자료는 해외저널에서 수집되었으며, 총 82 개 관련 학술지가 분석대상으로 사용되었다. 2000년에서 2017년까지 기간을 나누어 분석을 진행하였고, 첫 번째 기간 (2000-2008)은 "Globalization", "Hong Kong", "FDI" 및 "outsousing"과 같은 키워드가 상위 키워드로 도출되었다. 두 번째 기간(2009-2013)의 결과는 "internation trade", 및 "reverse logistics"와 같은 키워드들이 도출되었고, 세 번째 기간(2013-2017)에는 "3PL", "warehousing", "railways", "supply chain", "economic", "port" 및 "Belt and Road"등의 키워드가 상위로 나타났다. SNA 방법을 사용한 중국물류 연구 트렌드 분석 결과, 세계화 상황에서 중국이 급속히 변화함에 따라 중국 물류의 연구동향이 진화하고 있음을 보여주고 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제18권3호
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• pp.528-550
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• 2024

Warehousing demand prediction is an essential part of the supply chain, providing a fundamental basis for product manufacturing, replenishment, warehouse planning, etc. Existing forecasting methods cannot produce accurate forecasts since warehouse demand is affected by external factors such as holidays and seasons. Some aspects, such as consumer psychology and producer reputation, are challenging to quantify. The data can fluctuate widely or do not show obvious trend cycles. We introduce a new model for warehouse demand prediction called MAGRU, which stands for Multi-layer Attention with GRU. In the model, firstly, we perform the embedding operation on the input sequence to quantify the external influences; after that, we implement an encoder using GRU and the attention mechanism. The hidden state of GRU captures essential time series. In the decoder, we use attention again to select the key hidden states among all-time slices as the data to be fed into the GRU network. Experimental results show that this model has higher accuracy than RNN, LSTM, GRU, Prophet, XGboost, and DARNN. Using mean absolute error (MAE) and symmetric mean absolute percentage error(SMAPE) to evaluate the experimental results, MAGRU's MAE, RMSE, and SMAPE decreased by 7.65%, 10.03%, and 8.87% over GRU-LSTM, the current best model for solving this type of problem.

• 대한안전경영과학회지
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• 제10권3호
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• pp.117-126
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• 2008

RFID system the key technology of ubiquitous era, has been emphasized in logistics. Logistic enterprises are required to apply RFID systems considering their investment costs, actual effectiveness, operational satisfaction and so on. For such a purpose, many applicable methods of RFID system have been developed A method that RFID tags are directly attached to products or pallets is utilized in most cases. However, this method requires expensive investment cost, frequent replacement of damaged tags for the small and medium (SM) third party logistics. In this paper, we analyze statistically the current status and requirements of SM third party logistics. Based on their requirements, we propose the realtime warehousing-delivery management by the method to attach a RFID tag to each warehouse rack, together with the economy analysis index in order to evaluate economical efficiency. Consequently, this method is expected to reduce Investment cost and to improve operational effectiveness and satisfaction.