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장찬익,권순달,최낙준 서울교육대학교 2001 한국초등교육 Vol.13 No.1
This paper premises that the teacher's performance is different depending on the subject matter in teacher education. The objects of this paper are as follows. At first, this research is reviewed how curriculums of three type teachers education colleges - eleven national universities of education. K national university of education, E womans university - in korea is operating. Secondly, Teacher's performance is interviewed by 26 teachers in 9 elementary schools. They had studied subject matters in each other colleges and universities for elementary teachers. Data is analyzed by triangulations. The results showed that 11 national university of education demands high a grades for student in order to get the certification of teacher. Those of both teachers colleges of university is low. But pre-service subject matter education does not satisfy all of teachers. They assert that curriculums are changed not theory but practical. methods. This study appears that teachers are cultivated the knowledge and teaching method of subject matter in pre-service education.
An Algorithm of Locating the Position by using the Phase Difference Relation
Rag-Gyo Jeong,Hong-Shik Cho,Sang-Gi Chung,Ki-Dong Shin,Young-Seok Kim 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
These An accurate and reliable tracking system is essential for the central train control system. There are two systems widely in use. One is the fixed block system which utilizes the track circuit for the detection of train position. The other is the moving block system which has an advantage over the former since it enables shorter headway and easier maintenance. At this time there is active study being conducted on a train tracking system which uses a radio signal for the detection of the train position. This paper proposes a new algorithm which uses the radio signal's phase difference of arrival to detect the train position. Experimental verification of the algorithm is presented in the paper. The paper also reviews the effects on the phase of the radio signal when it is transmitted.
Range Assessment Using Radio Communication System
Rag-Gyo Jeong,Kyung-Ho Shin,Yong-Ki Yoon,Yang Doh Chul 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, We applied CBTC(Communication based Train Control), moving block system based on duplex transmission communication, to trial line so that advanced driverless driving system can be implemented by using radio communication. In order to apply CBTC to the test line, we used TOA(Time of Arrival) as a means to detect train location. We also checked whether perfect communication is performed in every 0.5 second by building Bucket Brigade Radio Network between WRS(Wayside Radio Set) and VRS(Vehicle Radio Set). By doing so, we verified that the range is linearly increasing with increasing the distance between WRS and VRS, and the quality at the range point is also superior. Only measuring results on Route A, single running among Route A, B, and single running, multiple running
철도신호시스템 교체에 따른 운행 시나리오 도출에 관한 연구
정락교(Rag-Gyo Jeong),김백현(Baek-Hyun Kim),강석원(Seok-Won Kang),고영환(Young-Hwan Kho) 대한전기학회 2014 전기학회논문지 Vol.63 No.8
The railway signalling system plays an essential role in the headway and routing control for a safe and efficient train operation. The reliable and safe operation of the system is very important because the failure of the railway signalling system can lead to the collision, derailment, or unexpected stop of a train. So far, the conventional wayside signal mode (ATS: Automatic Train Stop) has been generally used as the railway signalling system. However, this system is highly linked to a risk of major accidents resulted from human mistakes such as missing a signal or careless control of train speed. Accordingly, the onboard signal mode (ATC: Automatic Train Control) as an alternative of ATS has been recently introduced and applied to transmit effectively the information on speed control of a train by using computers and communication equipment. In the process of replacing the obsolete signal system, it is necessary to switch over the system while providing passengers with normal services. Therefore, the integration of a railway signaling system compatible for both ATS and ATC and its interface is discussed in this study. In particular, the implementation scenario required for operation planning of the integrated system was designed, and the results as well as effects of its applicability test were also presented.
정락교(Rag-Gyo Jeong),김백현(Baek-Hyun Kim),강석원(Seok-Won Kang),서문석(Moon-Seog Seo) 대한전기학회 2018 전기학회논문지 Vol.67 No.1
Automatic Train Stop (ATS) is a device that automatically stops or decelerates a train when the train exceeds the permitted speed limits or violates the signal regulations. The railway signaling system has been evolved to an automatic train control system (ATC), and is being developed into Distance-to-Go and Communication Based on Train Control (CBTC). In spite of that, the ATS system is currently being operated in Seoul Metro (line 1 and 2) and most of railway lines in Korea as well as overseas. In this study, we presents the technical methodology to prevent human errors in order to secure the safety in operation of the ATS system.