• Title/Summary/Keyword: logistics systems

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Optimal Preventive Maintenance Period in Complex Systems in Considering Components Reliability Characteristic (하부 구성품의 신뢰도 특성을 고려한 복합 시스템의 최적 예방정비 주기 산출)

  • Lee, Youn-Ho;Lee, Ik-Do;Lee, Dong-Woo;Sohn, Ki-Hong
    • Journal of Korean Institute of Industrial Engineers
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    • v.37 no.4
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    • pp.390-399
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    • 2011
  • Generally the life-cycle cost of complex systems composed of several sub systems or equipments such as train, aircraft weapon systems is spent much more during operation and maintenance phase than development phase. The maintenance cost for maintaining the availability and extending the life span of systems comprise a large proportion of systems operation cost. The cycle of preventive maintenance affects operation and maintenance cost a lot. In this study we introduce a way minimizing life-cycle cost of systems by calculating more reliable preventive maintenance period than the results of previous study using systems reliability data considered the reliability and failure effect ratio of sub-systems or components. We can solve the preventive maintenance period problem known as NP-Hard as quick as possible by using modified genetic algorithm than using other models introduced in previous study.

Luminance Properties of Organic Light Emitting Diodes Using Zn-Complexes (Zn-Complexes를 이용한 OLEDs의 발광 특성 연구)

  • Jang, Yoon-Ki;Kim, Doo-Seok;Kim, Byoung-Sang;Kwon, Oh-Kwan;Lee, Burm-Jong;Kwon, Young-Soo
    • Proceedings of the KIEE Conference
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    • 2005.07c
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    • pp.1890-1892
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    • 2005
  • Recently, high luminance and high efficiency were realized in OLEDs with multilayer structure including emitting materials such as metal-chelate complexes. New luminescent materials, [2- (2-hydroxyphenyl)-quinoline] (Zn(HPB)q), [(1,10-phenanthroline)- (8-hydroxyquinoline)] Zn(Phen)q was synthesized. Zn-Complexes have low molecular compound and thermal stability. The ionization potential(IP) and electron affinity(EA) of Zn-complexes were measured by cyclic-voltammetry(CV). The fundamental structure of the OLEDs was $ITO/{\alpha}$-NPD/Zn-Complex/Al and then we made device structure rightly in energy band gap. We using Zn(Phen)q as emitting layer and Zn(HPB)q as electron transport layer. We measured current density-voltage, luminance-voltage characteristics.

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The Kernel of Technology in Logistics Systems (물류시스템의 핵심기술지도)

  • Byeon, Eui-Seok
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2004.05a
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    • pp.159-162
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    • 2004
  • Logistics industry confronting very complex situation because of small quantity, frequent orders, multinational enterprises, lack of human power etc. leads to diversity, flexibility and agility. In this paper, integrated approach is introduced for projecting national technologies in logistics systems related to IT and automated control industry. Three areas of automation, IT basis, and operation techniques are included along with business factors of transportation, warehousing, stevedoring, pecking, and information systems. As a result, the epitome concludes the technology of in-house development and joint collaboration with others.

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A Study of China's Condition as the Logistics Hub of Northeast Asia and a Development Strategy (중국의 동북아 물류중심화 현황과 발전전략에 관한 연구)

  • Oh, Moon-Kap
    • Journal of Distribution Science
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    • v.12 no.2
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    • pp.95-103
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    • 2014
  • Purpose - Korea has a better geographical location than other nations in the Northeast Asian region. This means that Korea has an opportunity to become the center of international physical distribution in Northeast Asia. Korea should take advantage of this opportunity by exploring appropriate strategies to achieve this goal, assuming government willingness, with a view to capitalizing on the geographical advantage of the Korean peninsula and constructing a comprehensive physical distribution network system. If we prepare for this scenario, Korea could become the center of international physical distribution in Northeast Asia. Research design, data, and methodology - This study has the purpose of determining how shipping companies form partnerships with third-party logistics providers, and the relevant implications. The survey methods used were personal interview and a questionnaire distributed through e-mail, fax, mail, and telephone. A total of 600 questionnaires were distributed, out of which 285 were returned. Of the collected questionnaires, 10 were excluded because of insufficient content, leaving 275 to be used in the study as available valid samples. The data that was collected from these samples was analyzed using the data coating process and by employing a statistical package program. Results - Flexible policies, administration, and systems will be needed to create better business practices. In this dissertation, first and foremost, the results reveal that in order to become the center of Northeast Asian logistics, Korea must transition into a new paradigm based on the current economic and social systems that have stemmed from bureaucracy, inflexibility, chauvinism, and egalitarianism. Flexible policies, administration, and systems will be required to create better business practices. Domestic logistics corporations need to occupy a strategic logistics hub, create a logistics network, and activate value-added logistics business strategies by ensuring significant manpower and by building a logistics information system to strengthen their competitive edge, creating an improved system. Conclusions - In this dissertation, first and foremost, we point out that in order to become a center of North East Logistics, Korea should change to a new paradigm from the old one based on current economic and social systems that have stemmed from bureaucracy, inflexibility, chauvinism, and egalitarianism. More reasonable business laws, systems, and policies based on market-driven flexibility and transparency should be created. Moreover, social norms and rules should be reasonably established, to accomplish political and social security. Korea has to cultivate a culture of tolerance for foreign companies. This involves a change of paradigm for the development of the capital city and satellite cities. It will take a powerful task force or organization to plan and execute the vision that aims to meet these needs, accomplish the necessary goals, use the appropriate system effectively, and make Korea a key country in the field of Northeast Asian logistics.

Understanding the Success Factors of Using Mobile Internet Systems in Logistics/Small Package Express Companies (물류.택배기업의 무선인터넷시스템 사용 성공요인에 관한 연구)

  • Park, Sang-Cheol;Kang, Youn-Jung;Seo, Young-Wook
    • The Journal of Information Systems
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    • v.18 no.2
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    • pp.127-150
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    • 2009
  • Although many employees in the logistics/small package express companies are using mobile information systems. there is little research on the individual impacts of adopting mobile information systems in the distribution area. Therefore, this study attempts to develop the research model to evaluate individual impacts on using mobile information systems which are frequently utilized in logistics and small package express companies. In order to propose the research model, we attempt to incorporate technology acceptance model and IS success model to evaluate individual impacts on using mobile information systems. To verify the research model, we collected 225 data from staffs who have mobile IT system in distribution and logistics area. We also verified the validity and reliability by using SEM(structural equation modeling). As a results, we found that system use, cognitive judgement and attitude can be the key variables to improve individual impacts by using mobile information system. We further found that perceived usefulness can be ere of the Imp factors to improve the individual impacts. Based on out findings, we can understand that this research model can provide a deeper understanding of individual impacts of mobile information systems.

A Study on Air Logistics Process Simplification based on RFID(1) (RFID를 적용한 항공물류 프로세스 간소화에 관한 연구(1))

  • Lee, Tae-Yun;Lee, Doo-Yong;Li, Zhong-Shi;Na, Hyeong-Seok;Lee, Chang-Ho
    • Journal of the Korea Safety Management & Science
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    • v.10 no.2
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    • pp.163-168
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    • 2008
  • These days, international air-logistics demand is getting bigger and bigger by increasing in trading volumes of export and import of Asia. It makes the air logistics of stakeholder to invest in air logistics facilities and information systems for meeting the growth of air transportation. However there are some problems that the efficiency of investment is not good by duplicately investing in information systems and moreover not compatible with each other because the stakeholder is investing in individual information system and air logistics facilities instead of constructing the integrated infrastructure. In this paper, we investigated the export, import, and transshipment process of air logistics to simplify air logistics process through the RFID(Radio Frequency Identification) application and the 4PL system.

Design of Logistics Transportation Robot Based on Modular Conveyor Rack and Path Planning in Logistics Center (모듈형 컨베이어 랙 기반 물류 이송 로봇의 설계 및 물류 센터 내 경로계획)

  • Kim, Young-Min;Kim, Yong-Tae
    • Journal of Institute of Control, Robotics and Systems
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    • v.22 no.2
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    • pp.83-88
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    • 2016
  • In this paper, a design method for a logistics transportation robot based on a modular conveyor rack and path planning considering the environment of a logistics center is proposed. The driving part of the logistics transportation robot is designed and the working method of lifter for the transportation function is explained. The design of the modular conveyor rack is also described and an algorithm for a logistics transportation robot using a modular conveyor rack is suggested. The $A^*$ algorithm is improved by using the concept of rotation cost and the initial state of the transportation robot's characteristics. We experimented with a four-step transportation algorithm for a logistics transportation robot using a modular conveyor rack and showed that the proposed method can be used successfully in a logistics center. In addition, we verified the effectiveness of the improved $A^*$ algorithm considering the rotation cost and the initial state of the robot.

Deployment of Cloud Computing in Logistics Industry (물류산업에서의 클라우드 컴퓨팅 활용 방안)

  • Jung, Jae Un;Kim, Hyun Soo
    • Journal of Digital Convergence
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    • v.12 no.2
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    • pp.163-171
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    • 2014
  • Cloud computing(cloud) is a good candidate for complementing weaknesses of logistics information systems(heterogeneous processes not able to be standardized, geographically scattered and seamed connectivity, etc.) and for supporting innovative activities of logistics. In this sense, we aimed to study deployment strategies of clouds specified in the logistics industry. To achieve our research goal, we reviewed up-to-date logistics clouds researches and analysis of clouds; platforms and deployment strategies for logistics. This study contributes to follow-up researches for establishing a development direction of logistics specific clouds and developing more concrete clouds for logistics.

A Study on Logistics Development in Mongolia

  • Boldbaatar, Tumenjargal;Yoon, Daeg-Wun
    • Journal of Navigation and Port Research
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    • v.36 no.4
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    • pp.313-319
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    • 2012
  • This study aims to present about current status of logistics in Mongolia. As a landlocked country have limited the role of a maritime transportation is a very poor country. However, Mongolia is a rich country in mineral resources in the world and became a center of increasing international trade. Therefore, Mongolia wants to develop logistics as other developed countries using a strategic location. Mongolia uses international port for transit China and Russia by railway. First, this paper focuses on discussing the current situation of logistics. Second it points out some issues currently facing by the governmental policy to promote. Finally, this paper presents some recommendations for developing logistics in Mongolia. The geographical remoteness of Mongolia which results in high cost of transport causes problems for trade relations with the rest of the world to grow.

Development of the Logistics Process Reference Model for the Domestic Application of RosettaNet Standard (로제타넷 표준의 국내 적용을 위한 물류 프로세스 참조 모델 개발)

  • Kim, Sun-Ho;Choi, Hyuk-Seung
    • IE interfaces
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    • v.17 no.2
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    • pp.180-189
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    • 2004
  • In this paper, we propose a reference model for logistics processes to improve the effect of RosettaNet standards application to domestic industry. First of all, implementation cases applied to logistics processes in the world are investigated. Second, logistics processes of domestic manufacturers are analyzed for the application of RosettaNet standards, and the processes are compared with PIP. Finally, a new logistics processes model and corresponding PIP documents which reflect domestic situations are proposed.