• 한국항만경제학회지
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• 제21권3호
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• pp.149-170
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• 2005

With the globalization of economy, there is keen competition among countries to be a logistics hub and companies are striving to be first in establishing logistics system centering on advantageous sites, especially airport and seaports, to perform supply, production and distribution. Gwangyang port has been designated as Free Economy Zone. This paper analyzes many problems and presents various measures to activate Gwangyang port as follows regional economy to promote Gwangyang Free Economy Zone, governmental support, introduction & logistics functions, early development of the hinterland, investment attraction into the area and diversified promotion & marketing activities.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2002년도 춘계학술대회 논문집
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• pp.106-110
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• 2002

The KTX, first Korean Highspeed train from Seoul to Busan, is scheduled to begin its passenger service in 2004, with improvement of existing railroad between Daegu and Busan and Honam region. This paper aims to suggest the best train operation plan and detailed diagram pattern so that the KTX could work effectively as much as possible. I suggest for instance, connecting direct train and local train, hub stations plan, multi-destination train, and improvement of fare system.

• 정보보호학회지
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• 제2권2호
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• pp.19-23
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• 1992

본 논문은 VIST 위성통신의 기본 보호망 구성과 Inboune/Outbound 링크 보호시스템의 구조, 기능 및 키분배에 대해 논하였다. 그 구성 및 보호관리는 OSI 모델에 준하며, SDNS 의 서비스도 수용될 수 있다. 링크 보호서비스는Inbound/Outbound 링크보호모뉼에 의해 수행되나, 보호관리는 HUB host의 응용계층에 있는 보호관리응용에 의해 전적으로 이루어진다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.775-789
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• 2011

Centering on KTX stations, Korea is implementing specialized development of metropolitan business zones nationwide and is in the process of building the transfer link system of transportation in order to actualize intermodalism nationwide. Daejeon station, hub of high-speed railway requires the effective transportation transfer system considering Daejeon station area reorganization plan and opening of second phase high-speed railway. Based on the analysis of the possibility and validity of building a transit center under the Transportation System Efficiency Act, it is necessary to make a mutual benefit in a regional development by installing the resonable transfer system between railway and other transportation services. Through analysis of current situations and technical, economic and environmental feasibility evaluation, design plan of effective transportation transfer system in Daejeon station is proposed.

• 한국시스템다이내믹스연구
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• 제12권1호
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• pp.89-114
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• 2011

With steady increase in the demand for door-to-door delivery services, courier service providers are facing a constant pressure to reduce delivery price in order to secure quantity order and to improve the efficiency and reliability for customer service. The objective of this research is to explain the structure of the door-to-door delivery including door-to-door delivery service demand, sorting capacity in the hub-terminal, and the system performance measures such as service reliability networks using causal loop diagram(CLD). Based on causal relation, this research describes a comprehensive approach to examine how capacity reliability contributes to the renewal of the firm's competences through its reciprocal relationship with travel time reliability and connectivity reliability. Also, this research suggests the policy alternatives to improve effectiveness and efficiency of door-to-door delivery network in response to increase customer satisfaction and profit maximization of the courier service providers: operational, tactical, and strategic levels.

• 제어로봇시스템학회논문지
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• 제11권8호
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• pp.709-716
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• 2005

As a way to build more efficient and intelligent container cranes for todays hub ports, communication networks are used to interconnect numerous sensors, actuators, controllers, and operator switches and consoles that are spatially distributed over a crane. Various signals such as sensor values and operator's commands are digitized and broadcast on the network instead of using separate wiring cables. This not only makes the design and manufacturing of a crane more efficient, but also easier implementation of intelligent control algorithms. This paper presents the performance evaluation of CAN(Controller Area Network), TTP(Time Triggered Protocol) and Byteflight that can be used for cranes. Through discrete event simulation, several important quantitative performance factors such as the probability of a transmission failure, average system delay (data latency) and maximum system delay have been evaluated.

• Journal of Electrical Engineering and Technology
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• 제8권4호
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• pp.704-711
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• 2013

Data center is an information hub and resource for information-centric society. Since data center houses hundreds to ten thousands servers, networking and communication equipment, and supporting systems energy saving is one of the hottest issues for green data center. Among several solutions for green data center this paper introduces higher voltage direct current (DC) power feeding system. Contrary to legacy alternating current (AC) power feeding system equipped with Uninterruptible Power Supply (UPS), higher voltage DC power feeding system is reported to be a more energy efficient and reliable solution for green data center thanks to less AC/DC and DC/AC conversions. Main focus of this paper is on reliability issue for reliable and continuous operation of higher voltage DC power feeding system. We present different types of configuration of the power feeding systems according to the level of reliability. We analyze the reliability of the power feeding systems based on M/M/1/N+1/N+1 queueing model. Operation of the power feeding system in case of failure is also presented.

• 통상정보연구
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• 제13권4호
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• pp.51-79
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• 2011

우리나라는 2003년부터 2008년까지 전자정부 과제로 인터넷기반의 국가전자무역망(uTradeHub)을 성공적으로 구축하여 무역의 전자화를 활성화하고 있으며, 전자무역의 마지막 단계라고 불리는 선하증권(B/L)을 전자화한 '한국형 전자선하증권 서비스(e-B/L Korea)'를 정부와 민간의 협력 하에 구축하여 시범사업을 거쳐 2009년에 공식적으로 전자선하증권 서비스에 들어갔다. 국가적 차원에서 상법을 개정하고 시행령을 만들어 선하증권을 제도화한 것은 세계 최초이며 세계 각국이 이의 성공여부에 지대한 관심을 가지고 주목하고 있다. 한국형 선하증권의 성공은 2011년 말을 기점으로 우리나라가 세계에서 9번째로 무역 1조불 클럽에 가입한 '무역강국'의 위상을 높이고 실질적으로 우리 수출입기업의 무역거래비용을 절감함으로써 향후 무역 2조불시대를 앞당길 전자무역 활성화의 시금석으로 인식되고 있다. 하지만 아직은 국가 간 연계구축망이 부재하고, 서류의 보안성과 안전성올 높이기 위한 전자인중이 국제적으로 통용되고 있는 사적인증을 배제하고 국내공인인증만을 취급하는 등 e-B/L 서비스를 활성화하기 위해서 해결해야할 문제점도 산적해 있어 실질적으로 e-Nego 서비스가 크게 확산되지 못하는 실정이다. 따라서 본 연구는 e-Nego 또는 서면전환 과정에서 발생할 수 있는 한국형 전자선하증권의 변형에 따른 문제점을 비롯하여 구조적, 제도적 문제점과 사용상 장애요인을 도출하여 이에 대한 해결방안을 제시하였으며, 한국형 전자선하증권의 특성을 검토하고 통 서비스 활용을 활성화하기 위한 전략을 제시하였다.

• 한국항공운항학회지
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• 제15권4호
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• pp.100-107
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• 2007

We proposed the concatenation of logistics' Information to constructing the intelligent logistics city that is to manage efficiently cargo distribution as providing at real-time information of cargo location trace and management through the Telematics/RFID. Case of the Incheon of the "Air Logistics Hub", this area is on an increasing trend on the quantity of cargo transport of the Air & Sea cargo system until 2006. As intelligent project of the Air's and the Sea's field is independently developed at each area, it is a problem on the concatenation of logistics' information such as freight location trace and management, operation management and route information of cargo vehicles. Therefore, we propose the advanced transport service model for the concatenating smoothly of Air & Sea cargo system. In this paper, we only manage the model of Air & Sea cargo system of the advance logistics city.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2004년도 추계학술발표대회 논문집
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• pp.108-111
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• 2004

Structural dynamic characteristics and aeroelastic stability of a small-scale bearingless rotor system have been investigated. A flexbeam is one of the most important component of bearingless hub system. It must have sufficient torsional flexibility as well as baseline stiffness in order to produce feathering motion. In the present paper, a cross-shaped composite flexbeam has been proposed for a guarantee of torsional flexibility and flapwise and lagwise bending stiffness. One dimensional elastic beam model was used for the construction of a structural model. Equivalent isotropic sectional stiffness was used in the blade model, and the flexbeam was regarded as anisotropic; which has ten independent stiffness quantities. CAMRAD II has been used for the analysis of structural dynamic characteristics of the bearingless rotor system. Rotational natural frequencies and aeroelastic stability at hovering have been investigated. Analysis result shows that the cross-shaped flexbeam has the rotational natural frequency tuning capacity.