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도시형 순환 열차에서 운전 최적제어 시스템에 관한 연구
홍효식(Hong Hyo Sik),유광균(Ryu Kwang Gyun),송문석(Song Noon suck) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper is implemented a control algorithm in order to be stable and minimized to entire train traffic system at delayed case. Signaling system is described wi th algebraic equations given for train headway, Discrete-event simulation principles are reviewed and a demonstration block signaling model using the technique is implemented. Train congestion at station entrance for short headway operation is demonstrated and the propagation of delays along a platform of trains from any imposed delay to the leading train is also shown. A rail way signaling system is by nature a distributed operation with event triggered at discrete intervals. Although the train kinematic variables of position, velocity, and acceleration are continually changing, the changes are triggered when the trains pass over section boundaries and arrive at signals and route switches. This paper deals wi th linear-modeling, stability and optimal control for the traffic on such metro line of the model is reconstructed in order to adapt the circuits. This paper propose optimal control laws with state feedback ensuring the stability of the modeled system for circuits. Simulation results show the benefit to be expected from an efficient traffic control. The main results are summarized as follows: 1. In this paper we develop a linear model describing the traffic for both loop lines, two state space equations have been analyzed. The first one is adapted to the situation where a complete nominal time schedule is available while second one is adapted when only the nominal time interval between trains is known, in both cases we show the unstability of the traffic when the proceeding train is delayed following properties. - They are easily implemented at law cost on existing lines. - They ensure the exponetial stability of loop system. 2. These control laws have been tested on a traffic simulation software taking into the non-linearites and the physical constraints on a metro line. By means of simulation, the efficiency of the proposed optimal control laws are shown.
열차 제어 임베디드 시스템에서의 신뢰성 검증에 관한 연구
홍효식(Hyo Sik Hong) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
Since the embedded system is more intelligent, the importance of the reliability in the embedded system is a lot more visible. Especially the reliability of the embedded system in the train control system is even better important. As the special quality of the embedded system, the hardware of the system is directly controlled by the software in the embedded system. As the expansion of complexity , the expense amd the time for verification is required more and more. This paper is presented the verification of the reliability as the method with background of failure Embedded system is gradually, the importance of 'A built-in on the system embedded system's reliability is focused . In particular, in the train control system built-in of the embedded system, reliability is even more important. The embedded system of the system controls over hardware, software with built-in directly. The more complex system is , the more increasable of depending on the reliability of the time verification and expensive is . This paper is about he characteristics of the reliability and verification of embedded system under the failure mechanisms, based on the verification methodology suggested by in the train control system.
철도에서 에너지 최소 소비량을 위한 거리기준 운행프로파일 작성 방법에 관한 연구
홍효식(Hong hyo sik),유광균(Ryu kwangkyun) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
A running-profile generation method has been developed that efficiently generates the minimum-energy running profile, even in railway lines which have complicated speed limit sections. In the developed method, the problem of minimizing energy consumption is formulated as a resource allocation problem by dividing a running profile into several blocks, and is solved by the incremental method. A concept of Uni-Braking Block (UBB) which has only one brake section within it is introduces for the formulation. This paper proposes a specific method for running profile in the railway lines by using UBB. And proposes the algorithm to generate the running profile with minimum-energy.
철근콘크리트 도상과 AF 궤도회로의 상호영향에 관한 연구
홍효식(Hong Hyo-Sik),유광균(Yoo Kwang-Kiun),노성찬(Rho Sung-Chan),허남경(Her Nam-Kyoung) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
For the characteristic of improvement of railway roadbed environment and a convenient maintenance the use at ferroconcrete roadbed is increasing. The ferroconcrete roadbed arranges the steel frame with the lattice shape and submerge of a concrete. In order to overcome the limit of ground signal system, the use of AF track circuit for CAB signal system is increasing. The AF track circuit using on audio frequency signal is being influence with ferroconcrete roadbed. It occur to alternation on the track circuit characteristic. This paper prove influence of the AF signal and ferroconcrete roadbed by simulation and then calculation of distance variation of track circuit.
우정욱(Jung-wouk Woo),홍효식(Hyo-sik Hong) 한국국제상학회 2012 國際商學 Vol.27 No.4
With the prevention of global warming emerging as a global issue, South Korea has accelerated its efforts to introduce a intermodal transportation system to grow out of the old logistics system dependent on road transportation and promote environment friendliness and energy efficiency. The government has devised intermodal transportation policies such as“Basic Plan for Sustainable Traffic and Logistics ”and “Second Revised Basic Plan for National Logistics,” granted subsidies to shippers and logistics companies that made a conversion of transportation means through the policies, and provided supports by expanding the complex uniform railroad transportation and overhauling the deteriorated railroad facilities. As for 2010, however, the freight transportation percentage of railroads was 5.2% in tons and 14.8% in ton kilometers, which indicates the country remains in a stagnant state. As for Japan, it has made efforts to expand intermodal freight transport through a variety of legal and institutional supports since the adoption of Kyoto Protocol in 1997, intending to establish an environment-friendly and sustainable transportation system. The Japanese railway service also focuses on passenger transportation and thus has a difficult time implementing a policy to improve the environment of freight transportation, still making active efforts to improve and maintain railroad facilities in response to intermodal freight transport. This study set out to examine the case of Japan, which has proactively responded to the expansion of intermodal freight transport through railways to establish a logistics system according to social and economic environment changes, and explore the directionality of setting up a intermodal freight transport in South Korea.
우정욱(Jung Wouk Woo),홍효식(Hyo Sik Hong) 한국무역연구원 2015 무역연구 Vol.11 No.1
Clean Development Mechanism (CDM) allows developed nations with greenhouse gas emission reduction commitment under the Kyoto Protocol to implement an emission-reduction project in developing countries and have the emission reduction credits recognized as its own. The sector of transportation accounts for approximately 20% in global CO emissions. Although it is regarded as a field that has a high need for support in developing countries, reviews of CDM projects in the field have been postponed due to uncertain performance measurement and the poor development of analytical techniques for effect measurement. One of the major support projects for developing countries, the railroad sector in particular, has a very small number of cases registered at United Nations Framework Convention on Climate Change (UNFCCC) as CDM projects and thus shows limitations with the implementation of CDM. This global situation is also the case in South Korea. This study thus set out to review the indicators and methodologies to measure project effects and explore their applicability to CDM projects in Korea as a way to expand CDM projects in the railroad sector, which is known to have great potential for emission reduction in the sector of transportation, as well as to examine all the improvement tasks for project expansion.