• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1181-1182
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• 2007

Light Rail Transit (LRT) System is an urban transit system which has approximately an intermediate transportation capacity between conventional subway and bus ($5,000{\sim}25,000$ persons per hour and per direction). It is a high-tech system which operational capacity, punctuality and mobility are remarkably improved. There are some types of LRT systems such as monorail, tramway, AGT(Automated Guideway Transit), and so on. The LRT systems have been applied and being operated in about a hundred lines around the world and many projects that apply the LRT systems in Korea are being proceeded and scheduled. For the efficient management, economical construction, and safe operation of various LRT systems, the establishment of national standard is necessary such as vehicle standardized specification, vehicle performance test standard, vehicle safety standard, construction guide, operation regulation, etc. of LRT systems. This paper presents the standard specification of electrical equipment of linear induction motor type light rail vehicle, that is LIM AGT(AGT system propelled with linear induction motor) vehicle. The LIM AGT system has been applied in Japan subway and ART(Advanced Rapid Transit) system of Canada and Yongin LRT is currently under construction.

• 경영정보학연구
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• 제14권2호
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• pp.21-46
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• 2012

기술발달에 따라 기업들의 정보시스템에 대한 의존도가 높아지고 있는 만큼 보안위험에 노출될 확률도 더 높아져 보안위험관리에 대한 개발과 강화가 어느 때보다 요구되고 있다. 따라서 본 연구에서는 조직 내에서 자발적으로 보안위험관리 활동을 실행하고 있는 기업을 대상으로 보안관리 인지 요인의 6가지 변수가 보안위험관리 인지와 보안위험관리 개발의지에 어떤 영향을 주는지 나아가 이 두 가지 요소가 조직의 보안위험관리 실행에 어떤 영향을 미치는지를 실증적으로 증명하고자 하였다. 보안관리 인지 요인의 6가지 변수로는 조직원의 보안관리행동, 보안의무준수, 지각된 이득, 지각된 희생, 사회적 압력, 보안위험경험을 제안하고 이 변수들이 보안위험관리 인식과 개발의지에 나아가 보안위험관리 실행에 어떤 영향을 주는지에 대해 검증하였다. 가설검증을 위해 국내기업들을 대상으로 설문조사를 실시하여 237부의 데이터를 수집하여 PLS 방법으로 분석하였다. 그 결과 제안된 6가지 인지 요인 중 지각된 희생을 제외한 모두가 보안위험관리 인식 및 개발의지에 유의한 영향을 미치는 것으로 나타났으며 보안위험관리 수행 역시 인식 및 개발의지와 상관관계를 형성하는 것으로 나타났다.

• 한국ITS학회 논문지
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• 제7권4호
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• pp.107-117
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• 2008

본 논문에서는 국내 ETC(Electronic Toll Collection)인 한국도로공사의 하이패스 시스템의 보급에 힘입어 2008년 현재까지 약 125만대가 보급되어 있는 IR(Infrared)/RF(Radio Frequency)-DSRC(Dedicated Short Range Communication)를 BIS(Bus Information System) 혹은 UTIS(Urban Traffic Information System)와 같은 보다 향상되고, 많은 차량 단말(OBE; On Board Equipment)을 제어해야 하는 시스템에 사용하기 위한 척도로써 IR/RF-DSRC의 전송 효율에 관한 성능을 시뮬레이션을 통해 평가하고, 각 시스템의 장단점을 찾아보고자 한다. 특히 DSRC는 짝은 통신 영역에서 높은 이동도를 갖는 개체에게 고속의 데이터를 전송하여야 한다는 점에서 일반적인 통신 시스템에 비해 MAC(Media Access Control)의 속성이 가장 중하다고 할 수 있다. 따라서 본 논문에서는 이러한 매체 접근성의 관점에서 IR/RF-DSRC, 두 시스템의 성능을 분석하고자 한다.

• 한국정보통신학회논문지
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• 제18권11호
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• pp.2738-2744
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• 2014

전 국토가 골고루 발전할 수 있는 세종시가 조기에 정착할 수 있는 방법 중 교통 인프라 구축이 가장 선행되어야 한다. 여러 가지 교통수단이 있지만, 본 연구에서는 BRT(Bus Rapid Transit)와 철도를 중심으로 연구하였다. 건설비가 지하철보다 10분의 1에 불과하지만, 지하철의 시스템을 갖추어 수송능력을 크게 높이는 신개념 대중교통수단 BRT, 기존선을 활용하여 건설하는 충청권 광역철도가 있다. 또한, 대전지하철 1호선을 정부세종청사까지 연장 운행하여 중앙행정기관 이전과 세종시 인구유입에 따른 교통수요의 급격한 증가에 대비하여 교통편익을 제공하고 세종시에 새로운 교통수단이 추가로 건설하여 인근 지역과 상생 발전을 기대할 수 있다.

• 한국지능시스템학회논문지
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• 제25권3호
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• pp.299-305
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• 2015

Global environmental concerns and the ever increasing need of energy, coupled with steady progress in renewable energy technologies, are opening up new opportunities for utilization of renewable energy resources. Distributed electricity generation is a suitable option for sustainable development thanks to the load management benefits and the opportunity to provide electricity to remote areas. Solar energy being easy to harness, non-polluting and never ending is one of the best renewable energy sources for electricity generation in present and future time. Due to the random and intermittent nature of solar source, PV plants require the adoption of an energy storage and management system to compensate fluctuations and to meet the energy demand during night hours. This paper presents an efficient, economic and technical model for the design of a MPPT based grid connected PV with battery storage and management system. This system satisfies the energy demand through the PV based battery energy storage system. The aim is to present PV-BES system design and management strategy to maximize the system performance and economic profitability. PV-BES (photovoltaic based battery energy storage) system is operated in different modes to verify the system feasibility. In case of excess energy (mode 1), Li-ion batteries are charged using CC-CV mechanism effectively controlled by fuzzy logic based PID control system whereas during the time of insufficient power from PV system (mode 2), batteries are used as backup to compensate the power shortage at load and likewise other modes for different scenarios. This operational mode change in PV-BES system is implemented by State flow chart technique based on SOC, DC bus voltages and solar Irradiance. Performance of the proposed PV-BES system is verified by some simulations study. Simulation results showed that proposed system can overcome the disturbance of external environmental changes, and controls the energy flow in efficient and economical way.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2002년도 추계학술발표논문집 (상)
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• pp.535-538
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• 2002

InfiniBand is a switched-fabric architecture for next generation I/O systems and data centers. The InfiniBand Architecture (IBA) promises to replace bus-based architectures, such as PCI, with a switched-based fabric whose benefits include higher performance, higher RAS (reliability, availability, scalability), and the ability to create modular networks of servers and shared I/O devices. The switched-fabric InfiniBand consists of InfiniBand subnets with channel adapters, switches, and routers. In order to fully grasp the operational characteristics of InfiniBand architecture (IBA) and use them in ongoing design specification, simulation of subnet management of IBA is inevitable. In this paper, thus, we implement an IBA simulator and test some practical sample networks using it. The simulator shows the flow of operation by which the correctness and effectiveness of the system can be verified.

• Elastomers and Composites
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• 제56권1호
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• pp.20-31
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• 2021

There is an increasing demand for the rolling resistance reduction in truck bus radial (TBR) tires in the tire industry. In TBR tires, natural rubber is used as a base polymer to prevent wear and satisfy required physical properties (cut and chip). A binary filler system (silica and carbon black) is used to balance the durability of the tire and rolling resistance performance. In this study, natural rubber (NR) compounds applied with a binary filler system were manufactured at different cure temperatures for vulcanizate structure analysis. The vulcanizate structures were categorized into carbon black bound rubber, silica silane rubber network, and chemical crosslink density by sulfur. Regardless of the cure temperature, the cross-link density per unit content of carbon black had a greater effect on the properties than silica due to affinity with NR. The relationship analysis between the mechanical, viscoelastic properties with vulcanizate structure could be a guideline for manufacturing practical TBR compounds.

• 대한전기학회논문지:전력기술부문A
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• 제50권11호
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• pp.506-513
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• 2001

The islanding detection for distributed resources (DR) becomes an important and emerging issue in power system protection since the distributed generator installations are rapidly increasing and most of the installed systems are interconnected with distribution network. In order to avoid the negative impacts from islanding operations of DR on protection, operation and management of distribution system, it is necessary to effectively detect the islanding operations of DR and rapidly disconnect it from distribution network. Generally, it is difficult to detect islanding operation by monitoring only one system parameter This paper presents a new logic based islanding detection method for distributed resources(DR) which are interconnected with distribution network. The proposed method detects the islanding operation by monitoring four system parameter: voltage variation, phase displacement, frequency variation, and the variation of total harmonic distortion(THD) of current; therefore, it effectively detects island operation of DR unit operating in parallel with the distribution network. We also verified the efficiency of the proposed algorithm using the radial distribution network of IEEE 34 bus model.

• Journal of Electrical Engineering and Technology
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• 제10권2호
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• pp.465-473
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• 2015

The increasing need to improve transient security assessment of existing or forecasted operating conditions of networks by power system operators is major concern of the power system security monitoring problem at the Energy Management Systems. This paper proposes a preventive control of transient stability with generation rescheduling based on rotor trajectory index obtained using time domain simulations. This index may help power engineers in making operational decision and to obtain a generation configuration with better transient security dispatch. The effectiveness of the proposed methodology is demonstrated on IEEE 39-bus New England system for a three phase fault at different loading conditions with single and multiple line outage cases.

• 대한전기학회논문지:전력기술부문A
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• 제53권1호
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• pp.43-55
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• 2004

This paper presents a study on evaluating the reliability indices considering a transmission system. Because successful operation of electric power under the deregulated electricity market depends on transmission system reliability management, quantity evaluation of transmission system reliability is very important. This paper introduces features and operation modes of the Transmission Reliability Evaluation for Large-Scale Systems(TRELSS) Version 6.0, a commercial program made in EPRI, and TranRel-I V3.2, a educational program made in GSNU(GyeongSang National University) for assessing reliability indices of composite power system. The packages access not only bulk but also bus indices for reliability evaluation of composite powers system. The practicality, effectiveness and future works of this methodology are illustrated by demonstrations of two case studies of modified IEEE 25 buses reliability test system using TRELSS and TranRel-I and a brief case study for the KEPCO size system using TranRel-II made in GSNU.