• Title/Summary/Keyword: Logistics network design

Search Result 123, Processing Time 0.027 seconds

Search Heuristics for Capacitated Refuse Collection Network Design in Reverse Logistics (역방향 로지스틱스에서 용량제약을 고려한 수거망 설계문제에 관한 탐색기법)

  • Kim, Ji-Su;Choi, Hyun-Seon;Lee, Dong-Ho
    • Journal of Korean Society of Industrial and Systems Engineering
    • /
    • v.33 no.1
    • /
    • pp.41-50
    • /
    • 2010
  • 본 논문에서는 수명이 다한 제품이나 소비자가 더 이상 사용하지 않는 폐기품을 다시 재사용하거나 폐기하는데 필요한 일련의 활동을 위한 역방향 로지스틱스에서의 수거망 설계 문제를 다루고 있다. 수거망 설계 문제는 수거지점의 위치와 수요지의 폐기품을 수거 지점에 할당하는 것을 결정하는 문제로 정의할 수 있으며 수거지점은 재활용품이나 폐기품이 위치한 지점 근처에 위치하고 주어진 잠재적인 위치를 중에서 결정하게 된다. 여기서, 각 수거지점은 용량제약이 있어 수거 지점에 할당되는 폐기품의 양에는 제한이 있다. 본 논문에서 다루는 수거망 설계문제에서는 수거지점을 설치하는데 필요한 고정비용과 수요지와 수거지점간의 수송비용의 합을 최소화하는 것을 목적으로 한다. 또한 대상문제를 보다 명확히 설명하기 위하여 징수계획법을 이용한 수리적 모형을 제안하였으며 문제의 복잡도 인하여 타부 서치와 시뮬레이티드 어닐링 두 가지 형태의 탐색기법을 제안하였다. 이들 탐색기법에 대하여 최대 500개의 잠재적 위치를 가지는 문제에 대하여 실험을 수행하였고 실험결과를 제시하였다.

A Baltic Dry Index Prediction using Deep Learning Models

  • Bae, Sung-Hoon;Lee, Gunwoo;Park, Keun-Sik
    • Journal of Korea Trade
    • /
    • v.25 no.4
    • /
    • pp.17-36
    • /
    • 2021
  • Purpose - This study provides useful information to stakeholders by forecasting the tramp shipping market, which is a completely competitive market and has a huge fluctuation in freight rates due to low barriers to entry. Moreover, this study provides the most effective parameters for Baltic Dry Index (BDI) prediction and an optimal model by analyzing and comparing deep learning models such as the artificial neural network (ANN), recurrent neural network (RNN), and long short-term memory (LSTM). Design/methodology - This study uses various data models based on big data. The deep learning models considered are specialized for time series models. This study includes three perspectives to verify useful models in time series data by comparing prediction accuracy according to the selection of external variables and comparison between models. Findings - The BDI research reflecting the latest trends since 2015, using weekly data from 1995 to 2019 (25 years), is employed in this study. Additionally, we tried finding the best combination of BDI forecasts through the input of external factors such as supply, demand, raw materials, and economic aspects. Moreover, the combination of various unpredictable external variables and the fundamentals of supply and demand have sought to increase BDI prediction accuracy. Originality/value - Unlike previous studies, BDI forecasts reflect the latest stabilizing trends since 2015. Additionally, we look at the variation of the model's predictive accuracy according to the input of statistically validated variables. Moreover, we want to find the optimal model that minimizes the error value according to the parameter adjustment in the ANN model. Thus, this study helps future shipping stakeholders make decisions through BDI forecasts.

A Synchronous System Design of an Intelligent-Integrated Production & Logistics Systems (지능형 통합 생산 물류 시스템의 동기화된 시스템 설계)

  • Bae, Jae-Ho;Wang, Gi-Nam
    • IE interfaces
    • /
    • v.12 no.2
    • /
    • pp.222-236
    • /
    • 1999
  • This paper presents a design and implementation of an intelligent-integrated production-logistics systems. The situation considered here is that there are multiple manufacturing plants and multiple distribution centers. Effective distribution resource and production planning are required to reduce inventory cost and to avoid inventory shortage. We propose an intelligent forecasting scheme of each distribution centers, adaptive inventory replenishment planning, distribution resource planning, and integrated production planning system. In forecasting a huge number of on-line model identification is performed using neural network approximation capability. An efficient adaptive replenishment planning and distribution resource planning are also presented in connection with forecasting scheme. An appropriate production is also requested based on production lead-time and the results of distribution planning. Experimental simulations are presented to verify the proposed approach using real data.

  • PDF

Container Transportation Models in Industrial Estate Area (산업단지내 효율적 컨테이너 운송을 위한 수송 모형)

  • Shin, Jae Young;Kim, Woong-Sub
    • Journal of Navigation and Port Research
    • /
    • v.38 no.2
    • /
    • pp.171-176
    • /
    • 2014
  • Companies are facing challenges to have high competitiveness because of continuous oil price rising and CO2 emissions regulations. Thus, companies are trying hard to construct effective logistics and operation system to achieve high customer service quality and saving cost. Also the ec-friendly idustrial complex is needed. Busan is in process to construct GILC(Global Industry Logistics City) in west Busan province to achieve high competitiveness and support lack of industrial complex. To construct this kind of logistics industrial complex, it needs logistics system through proper policy and freight transportation co-operation. Especially, efficient management through logistics hierarchy construction in industrial complex is very important for low cost and eco-friendly point of view. Therefore, this paper aims to analyze logistics system and suggest operation model to present logistics complex construction base data.

The Design of the Container Logistics Information System Reflects the Port Logistics Environment (항만물류 특성을 반영한 컨테이너 정보시스템 설계)

  • Park, Young-Jae
    • Journal of Digital Convergence
    • /
    • v.13 no.5
    • /
    • pp.159-167
    • /
    • 2015
  • The nature of port logistics requires global visibility and traceability. However, the traditional RFID technology still applied cannot meet these demands. IP-USN and M2M in port logistics have faced challenges of the prerequisite of network composition and immense communications at the base where a grand number of containers are installed. To resolve the issue, this study suggests an IP-RFID-based smart port logistics service platform. The IP-RFID-based port logistics service system resolved the communication problem by separating the RFID tag and AP, which allows internet connection, from the tag. The tags connected with thermo-sensors, humidity sensors, pressure sensors, GPS, etc. are attached to the containers insuring global visibility and traceability, key factors in logistics, by obtaining desired real-time information regardless of time and location.

Design of Multiband Maritime Network for Ships and its Applications

  • Yun, Chang-Ho;Cho, A-Ra;Kim, Seung-Geun;Park, Jong-Won;Lim, Yong-Kon
    • Journal of information and communication convergence engineering
    • /
    • v.7 no.3
    • /
    • pp.314-322
    • /
    • 2009
  • Nowadays, maritime communication systems need high data rate, reliability, and consistency in order to equivalently provide navigating ships with diverse multimedia services as in terrestrial communication systems. For this purpose, we conceptualize and design the maritime network for ships equipped with a multiband communication system which cost-effectively supports multimedia services according to several radiofrequency bands, such as HF, VHF, and satellite frequencies. We also introduce two service scenarios targeted for the maritime network; ship multimedia service (SMS) and real-time maritime logistics location tracking (RML2T). In addition, we specify related works according to three lower network layers (i.e., physical, data-link, and network layers) upon designing the network.

Keyword Network Analysis on Global Research Trend in Design (1999~2018) (글로벌 디자인 연구동향에 대한 키워드 네트워크 분석 연구 (1999~2018))

  • Choi, Chool-Heon;Jang, Phill-Sik
    • Journal of Convergence for Information Technology
    • /
    • v.9 no.2
    • /
    • pp.7-16
    • /
    • 2019
  • The purpose of this study is to identify the characteristics of researches that have been conducted for the last 20 years through analyzing global research trends and evolutions of design articles from 1999 to 2018 with keyword network analysis. For this purpose, we selected 3,569 articles in 22 journals related to design research retrieved from the Scopus database and constructed keyword network model through the author keyword and index keyword. The frequency of the author and index keyword, the centrality of betweenness and degree were analyzed with the keyword network. The results show that design has been applied to various fields for recent 20 years, and the research trends of design could be quantitatively characterized by keyword network analysis. The result of this study could be used to suggest future research topics in the field of design based on quantitative and empirical data.

Conceptual Design of Train System for Parcel Service of High Speed Railway (소화물 고속수송을 위한 철도차량 시설계획)

  • Kim Hyun-Woong
    • Proceedings of the KSR Conference
    • /
    • 2005.05a
    • /
    • pp.1105-1108
    • /
    • 2005
  • In oder to develope a train system for parcel service of high speed railway, which had been proposed for the operation of a high speed train, its conceptual design was build. Through this system, we are able to expect the fulfillment of customer needs for high speed rail market segments, and enhancement for cost-effective rail network operation of the mixed traffic on infrastructure cost-reduction in national logistics.

  • PDF

A Design of Internet-Based Safety Guarantee Global Integrated Logistics Management System Framework (인터넷 기반의 안전보장 글로벌 통합물류관리시스템 프레임워크 설계)

  • Hong, Ho-Seon;Hong, Ki-Sung;Lee, Chulung
    • Journal of the Korea Society of Computer and Information
    • /
    • v.18 no.5
    • /
    • pp.103-111
    • /
    • 2013
  • This paper provide a framework for an IGILMS(internet-based global integrated logistics management system) which can access and mediate cargo transportations among small- and medium-sized domestic/international logistics corporations as regards cargo, registration and search for space, public tender and negotiation, contract, payment and safety-guarantee, transportation through the internet, wireless communication means, or smart phone etc. In addition, we describe a model to provide customized services in the B2B e-market for IGILMS and the structure and the control of its fulfillment process, and provide technical architecture of the IGILMS for an internet-based global logistics management system. To validate an efficiency of the proposed system, we develop a simulation model and analyze the performance of the proposed system.

A Study of Air Cargo Logistic System Process (항공물류 시스템 프로세스의 개선에 관한 연구)

  • Lee, Hwi-Young;Lee, Jae-Jin
    • Journal of the Korea Society of Computer and Information
    • /
    • v.14 no.9
    • /
    • pp.179-187
    • /
    • 2009
  • The national boundary's meanings turn to weak according to advent of Global enterprises. The place for design a product and marketing are separated to actual market. R&D is to the area where the knowledge activity is well, and low skilful product assembling is to the place the low wage is acceptable. It shows that the importance of net work structure. From early 90's, production system is diversified to markets where with the consumer as the central as multifarious items and creation new demands through consumer's participation into manufacturing process. This phenomenon show that logistics structures adapt to demand of technical variation, and the development of e-business with VAN(:value added network) and EDI(:Electronic data interchange) prove it. This study tried to analyze utilitarian assay about systems those land, sea, air logistics through documents research, and this study also present the direction of logistics system of airline company and goal of development on the based to the model of domestic airline company accordingly.