• Journal of Korean Society of Industrial and Systems Engineering
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• v.31 no.3
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• pp.8-16
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• 2008

Mail centers play an important role such as sorting and transporting postal items in the process of postal logistics. Therefore, there is need of efficiency measurement of the facilities to reduce the inefficiency of factors. But only few attempts have so far been made at measuring the efficiency of postal logistics hubs. The purpose of this paper is to make a reasonable suggestion for the improvement of inefficient mail centers. So this study found the efficient mail centers and inefficient mail centers using data envelopment analysis(DEA) and compared inputs and outputs of the former with those of the latter.

• Electronics and Telecommunications Trends
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• v.24 no.5
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• pp.62-73
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• 2009

우편 산업은 우편 물류망을 근간으로 수작업 형태 업무 프로세스가 중점적인 사업영역이나, 최근 우편 사업 환경의 급속한 변화와 이에 따른 대응이 요구됨에 따라 세계 선진 우편사업들은 우편 자동화 및 정보화 기술을 적극 도입하고 있는 추세이다. 이를 위해 우편 사업 환경 및 인프라를 고려한 우편 자동화 체계 마련을 위해 우편자동화 설비기기 및 그 시스템과 우편 정보 시스템간 정보 연계, 서비스 연동뿐만 아니라 궁극적으로 자동화 설비기기를 구축함에 있어 하드웨어 기능과 소프트웨어 기능을 분리시켜 소프트웨어 기능 유지보수 비용을 최소화하기 위해 독립성을 제공하기 위한 우편 자동화 통합망 구축기술 개발에 주력하고 있다. 이는 우편자동화 설비기기의 자동화에 필요한 요소기술에 최신 IT 기술을 적용하여 설비기기간 정보 연계 및 서비스 연동을 실현함으로써 우편 업무 프로세스를 개선하고 신규 서비스를 창출하는 기반이 된다.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.47 no.2
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• pp.155-167
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• 2024

Distribution and logistics industries contribute some of the biggest GDP(gross domestic product) in South Korea and the number of related companies are quarter of the total number of industries in the country. The number of retail tech companies are quickly increased due to the acceleration of the online and untact shopping trend. Furthermore, major distribution and logistics companies try to achieve integrated data management with the fulfillment process. In contrast, small and medium distribution companies still lack of the capacity and ability to develop digital innovation and smartization. Therefore, in this paper, a deep learning-based demand forecasting & recommendation model is proposed to improve business competitiveness. The proposed model is developed based on real sales transaction data to predict future demand for each product. The proposed model consists of six deep learning models, which are MLP(multi-layers perception), CNN(convolution neural network), RNN(recurrent neural network), LSTM(long short term memory), Conv1D-BiLSTM(convolution-long short term memory) for demand forecasting and collaborative filtering for the recommendation. Each model provides the best prediction result for each product and recommendation model can recommend best sales product among companies own sales list as well as competitor's item list. The proposed demand forecasting model is expected to improve the competitiveness of the small and medium-sized distribution and logistics industry.

• IE interfaces
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• v.18 no.4
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• pp.454-464
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• 2005

In Postal logistics, the efficient design and operation of transportation network is very important issue. But, it is hard to operate the postal transportation network flexibly according to the change of mail volume. In Korea post, a transportation plan is pre-determined and the transportation of mail is performed through the routes in the plan. When the routes cannot transport all mail, temporary vehicles are used. In the postal transportation, it is important to make a good transportation plan and to manage the plan efficiently. But the change of transportation plan is not a simple work because hundreds of vehicles and persons are related to the plan. So, a methodology to check the effect of the change of the transportation plan in advance is required. In this paper, we develop a simulation model to evaluate the performance of a postal transportation plan. We implement the simulation model and develop an information system including user interface for managing data and simulation results. We apply our simulation model and system to the real change of transportation plan.

• Annual Conference of KIPS
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• 2007.11a
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• pp.477-478
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• 2007

최근 무선인식기술을 물류분야 적용하여 생산성 증대를 위한 일련의 국가사업이 활발히 진행되고 있다. 본 논문에서는 물류 분야를 중심으로 최근에 국가 시범사업을 포함하는 국내 동향을 살펴보고 향후 방향에 대하여 제언하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.3
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• pp.496-501
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• 2007

In this paper, we suggest postal RFID adaptation model and system architecture which can be used for real time trace and track of parcel processing and pallet management. This paper also shows postal RFID application system testbed based on the proposed postal RFID application model and architecture, and shows recognition performance of tag on parcel and pallet by speed and mounting tag material such as thin cans, water bottles, and paper using implemented postal RFID system to find the best solution for RFID adaptation in postal logistics environment. In the experiment, we can know recognition performance of paper and aluminium foil is better than water bottles and thin cans.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.33 no.1
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• pp.10-16
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• 2010

Mail centers are essential postal facilities that sort and dispatch postal items, and should be operated efficiently to provide customers high quality postal services. So the efficiency analysis of mail centers should be performed in order to induce better operation. But current performance evaluation system has 95 percent of predetermined and weighted non-quantitative indices. There is need to introduce objective efficiency measurement methodology. The main objectives of this study was to analyze the efficiency of 24 mail centers empirically using cone-ratio DEA and suggest the appropriate cone-ratio method. Consequently, this paper suggests that the cone-ratio DEA model integrating decision-maker's preferences is more desirable for efficiency analysis than that of using transformed data.

• Electronics and Telecommunications Trends
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• v.36 no.4
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• pp.118-134
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• 2021

In this study, we provide trends on alternative fuel vehicles promoted by postal agencies in 10 countries in North America, the EU, and Asia. It describes the specifications of most EV vehicles in operation, plans, and strategies to replace existing internal combustion engines with new vehicles in the future and provides the current status of alternative vehicle charging networks in each postal agency. This paper will help postal agencies, logistics companies, automobile companies, motorcycle companies, and even individuals who want to use vehicles with alternative fuels, such as electric vehicles, on strategies to establish and implement before introducing and operating the vehicles.

• Proceedings of the IEEK Conference
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• 2000.11c
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• pp.47-50
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• 2000

Recently many efforts on the development of automatic processing system for delivery sequence sorting have been performed in ETRI , which requires the use of postal 4-state bar code system to encode delivery points. The 4-state bar code called postal 4-state bar code for high speed processing that has been specifically designed for information processing of logistics and automatic processing of the mail items. This paper describes a method of Reed-Solomon encoding for creating error correction codeword of 4-state bar code.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.11
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• pp.3200-3206
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• 2009

This paper describes the problem of existing maintenance system for mail sorting machnies, and presents to-be considerations of maintenance system based on AHP (Analytic Hierarchy Process) analysis with efficiency and economic aspects. There are standard procedure for diagnosis and repair of mail sorting machine as preventive and operational maintenance, roles and missions of maintenance technical support center for upgrade of maintenance skill in this paper. The proposed maintenance system will be adapted for more safety and efficiency maintenance of mail sorting machine.