• Journal of Navigation and Port Research
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• v.28 no.9
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• pp.791-798
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• 2004

Since world container throughput continues to grow, the main issues facing decision-makers at port container terminals are how to expand the existing container terminals and construct new container terminals. Simulations can be used in the decision making process tools due to its ease and ability to reflect the real world system. The object-oriented approach provides for both reusability and modularity that best fits these requirements. In this paper, the object-oriented approach to modeling and simulating general container terminals is presented. Simulation tools based on Visual C++ provide a user-friendly input and output environment through the use of an object class-library. This paper also presents the case study of a simulation of a real container terminal i. Pusan, Korea

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2011.11a
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• pp.162-163
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• 2011

This paper presents the system dynamics methodology for modeling and control the production/inventory system. Under system dynamics point of view, we can apply some production/inventory policies as if we use the control laws for dynamics systems, then the behavior of system is analyzed and evaluated to improve the performance of production/inventory system. We also utilize the hybrid modeling method for the dynamic of production system with the combination of Matlab/Simulink and Matlab/Sateflow. Finally, the numerical simulation results are carried out in Matlab/Simulink environment and compare with the results from other works. It is shown that our approach can obtain some good performances (such as operational cost, stability of inventory, customer service level).

• Annual Conference of KIPS
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• 2002.11c
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• pp.2211-2214
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• 2002

사업 영역 확대와 네트워크 발달로 인해 전자상거래(Electronic Commerce)는 점차 국제적 환경으로 확대되고 있으며, 장소나 시간에 구애받지 알고 정보를 전송할 수 있게 되었다. 거래되는 업무가 증가됨에 따라 거래내용, 결제 내용(계좌번호, 카드번호 등), 비밀번호 등 교환되는 정보의 종류도 다양해져 보안의 중요성이 대두되었다. 이에 데이터 사용 효율과 응용 가능성을 높이기 위해 차세대 인터넷 표준으로 대두되고 있는 XML을 메시지 처리 단위로 정의하고, XML 기반의 인터넷 메시징 시스템인 IMSX (Internet Messaging System based on XML)을 설계하였으며, 보안 위협으로부터 대응하기 위해 암호화(Encryption)와 전자서명(Digital Signature) 등의 메시지 레벨의 응용 보안을 적용하였다. 또한 문서 송신, 문서 수신, 검색, 문서 변환, 템플릿(Template) 제공, 보안 서비스 등을 선정하여 구현하였다.

• Proceedings of the KOR-KST Conference
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• 2007.11a
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• pp.210-218
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• 2007

Road freight transport industry in Korea contains many and complicate problems such as over supply of the vehicle caused by rapid policy changes, illegal multilevel transactions, poor truck drivers working environment, lack of road freight transport related statistics and so on. Korean government has developed various logistics industrial policy trying to solve these problems in various ways. However, the relationship among the problems and action plans has been more and more entangled since the part of suggested policies have made another perverted problems. These complex structure of the toad freight transport industry in Korea makes difficult to identify and to solve the problems. Causal map method helps to give a clean picture to understand the complex industry at a glance. This study contributes for visualization of the causal relationships among the existing problems and related policy issues in the road freight transport industry in Korea by causal map. This study could be helpful to develop the actual road freight transport industrial policies including the illogical multilevel and unfair transaction in Korea.

• The Journal of Information Technology
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• v.3 no.1
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• pp.155-175
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• 2000

Electronic commerce has already existed for over 20 years. In sectors such as retail and automotive, electronic data interchange(EDI) for application-to-application interaction is being used regularly. For defence and heavy manufacturing, electronic commerce life-cycle management concepts have been developed that aim to integrate information across larger parts of the value chain, from design to maintenance, such as CALS(Computer Assisted Life-cycle Support or Computer Aided Logistics Support). Bolero's mission is to provide guaranteed and secure delivery, in electronic form, of trade documentation, globally, based on a binding legal environment and common procedures. Bolero will also provide a platform for provision of neutral cross-industry services.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.05a
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• pp.708-716
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• 2003

공급사슬의 구조가 복잡해지고 고객의 수요가 다양해지면서 공급사슬에서의 물류기능은 점점 중요시 되고 있다 지금까지의 생산자는 전체 물류의 $50\%$ 이상을 제 3자 물류 업체를 통하여 수행하였다 그러나 최근 대두되고 있는 제 4자 물류환경에서는 물류센터가 물류컨설팅기능까지 수행함으로써 더 효율적인 물류를 수행하는 것을 목표로 한다. 이러한 환경에서 공급사슬 내의 물류센터는 단순히 제품의 배송 및 보관, 조달 업무를 수행하는 단계로써의 역할이 아닌 독립적으로 이윤을 추구하는 기업의 형태로 존재하게 된다. 따라서 제 4자 물류환경에서의 물류센터는 제품의 다양한 특성 및 수요의 패턴에 따라 효율적인 재고정책 선택과정이 필요하다. 그러나 기존의 연구에서 제시하고 있는 재고정책을 현실에 적용하기에는 한계가 있다. 이에 본 연구에서는 제 4자 물류 환경에서의 물류센터 시스템 구조와 다양한 제품특성 및 물류환경을 고려한 재고정책 선택모델을 제시한다. 수치예제를 통해 제안한 모델의 타당성 및 제 4자 물류시스템의 기대효과를 제시한다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2008.04a
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• pp.882-888
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• 2008

The increase in logistics and the emergence of high speed vehicles are aggravating the noise problem, and disturbing large numbers of people. Therefore, growing attention is being paid to the creation and utilization of a noise map in order to grasp and predict the influence of noise, and to establish a policy that effectively reduces noise. However, so far there has been little progress in developing a predictive formula for railway noise, and a noise prediction program suitable for the domestic environment. Therefore, there is a need for a method to apply the overseas prediction formula to domestic railway vehicles. This study evaluated the prediction method, the result of which is similar to that of a real measurement, using a noise map. It also employed a commercial software program, SoundPlan, to predict noise.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.7
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• pp.1549-1558
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• 2012

Location-aware system is utilized in various fields such as Logistics, Home Network, Healthcare, Military and Transportation systems. In this paper, we designed and implemented a Location-aware system based on IEEE 802.15.4a CSS (Chirp Spread Spectrum) technology in variable environment. The CSS is possible to precision location awareness using RF signal. According to experimental result, the implemented system has recognition error less than 0.5m within 20m radius in space.

• Journal of Information Technology Applications and Management
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• v.14 no.2
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• pp.1-10
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• 2007

The ubiquitous computing system is expected to be widely utilized in digital home, logistics control, environment/disaster management, medical/health-care services and other applications. The ubiquitous sensor network (USN) is a key infra-structure of this system. Nodes in the USN are exposed to adverse environments and required to perform their missions with very limited power supply only. Also the sensor network is composed of much more nodes. In case some node consumes up its power capacity under a certain required level, the network topology should change and re-routing/ re-transmission of data is necessitated. Resultantly communication protocols studied for conventional wireless networks or ad-hoc networks are not suitable for the sensor network. Schemes should be devised to control the efficient usage of node power in the sensor network. This paper proposes a routing algorithm to enhance the efficiency of power consumption for USN node and analyzes its performance by simulation.

• Journal of the Korean Society for Railway
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• v.12 no.5
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• pp.751-760
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• 2009

The purpose of this study is to search how to improvement mathods of rail freight by understanding the problems and the evasion reasons in coping with various case of logistics environment and to enhance competitiveness of rail freight. So we examined improvement of in the productivity in the rail container possibility for Modal shift in Korea railway, we have done a survey among the shiffer and multimodal transport operators in Korea. Data were analyzed using quantitiative mathod.