• Proceedings of the KIEE Conference
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• 2000.07b
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• pp.1423-1425
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• 2000

경부고속전철(KTX)의 운행은 서울-동대구간은 고속선에 의한 고속 운행을 실행하는 반면, 동대구-부산간은 기존선 전철화 및 선로 개량 사업을 통해 기존선을 운행한다. 그 결과 남서울, 북대전, 남대전, 및 북대구의 기존선과 고속선 연결부 인터페이스는 가장 중요한 검토 및 연구 대상으로, 기존선과 고속선 간의 속도 형상에 대한 호환성은 KTX 차량의 적절한 운행을 결정하는 기본 요소이며 또한 필수 요소로 작용한다. 따라서 본 연구에서는 기존선과 고속선 신호 시스템의 호환성에 따른 속도 천이를 분석한다.

• Journal of the Institute of Electronics and Information Engineers
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• v.54 no.8
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• pp.123-132
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• 2017

Traffic lights contain very important information for safety driving. So, the delivery of the information to drivers in real-time is a very critical issue for advanced driver assistance systems. However, traffic light detection is quite difficult because of the small sized traffic lights and the occlusion in real world. In this paper, a traffic light detection method using modified color based saliency map and morphological information is proposed. It shows 98.14% of precisions and 83.52% of recalls on computer simulations.

• Proceedings of the KSR Conference
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• 2005.11a
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• pp.976-981
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• 2005

The Seoul subway line No.2 is the one of the busiest metro service line of the passenger transportation in Seoul metropolitan city. The number of the passengers served by the Seoul subway line No.2 is more than 1.9 million in a day according to the transportation reference of 2004, which is about $15\%$ of the whole population in Seoul metropolitan city. This is the reason why the Seoul Metropolitan Subway Corporation(SMSC) is implementing the refurbishment of the current ATS signalling system of Seoul Line No.2 into the most advanced ATO system with the continuous air-gap telegram transmission through the track circuit without any suspension of the train service either in when or in where, which is the first in the world in its attempt to refurbish the old signalling system under service without any suspension of the train operation.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.2082-2083
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• 2007

고속철도 운행, 도시철도 고밀도화, 무인자동운전의 경량전철 등 신교통시스템 도입 등 급변하는 철도환경에 따른 철도안전의 위험요인이 증가하고 있다. 국내 철도사고 사망자는 설비개량, 노후차량교체, 건널목입체화로 감소하고 있으나 10년을 주기로 대형참사가 발생하고 있으며, 철도관련 종사자의 안전의식이 낮은 수준이다. 이러한 대형참사의 발생을 방지하기 위하여 철도안전법이 제정되고 이의 효율적인 시행기반을 구축하기 위하여 철도시설안전체계 구축 및 기술분야별 안전기준을 개발하고 있다. 본 논문에서는 철도종합기술개발사업의 철도사고 위험요인분석(PHA : Preliminary Hazard Analysis)을 토대로 관계있는 위험원을 선정하였다. 또한 위험원에 의한 사고발생을 예방하기 위한 철도신호분야의 안전기준항목을 기술하였다.

• Proceedings of the KIEE Conference
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• 2008.04c
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• pp.184-186
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• 2008

경부고속철도의 개통과 함께 서울-부산 간 운행시간이 새마을호 기준 4시간 30분에서 2시간으로 단축되는 등 획기적인 시간 절감을 이루었으나 이는 고속철도가 운행되는 지역에 국한된 것이다. 이에 고속철도 비 수혜지역의 운행시간 단축을 위해 기존선 속도향상이 요구되며, 이러한 목적으로 한국철도기술연구원에서는 틸팅열차를 개발하여 시운전 10만Km를 목표로 시험운행중이다. 또한 한국철도공사에서는 이와 유사한 목적으로 기존선 신호시스템인 ATS 시스템을 차상신호시스템(ATP)으로 개량하는 사업이 추진되고 있다. 현재 틸팅열차에는 기존의 ATS(자동열차정지장치) 차상장치만을 장착하여 차량의 성능 확인을 위한 시험 및 시운전을 우선적으로 추진하고 있는 상태이며 이러한 ATS 차상장치는 160km/h 이하의 속도에서만 본연의 기능이 유지되고, 그 이상의 속도에서는 현실적으로 사용이 어렵기 때문에 틸팅열차의 목표속도인 200km/h에서 적합하게 시험하기 위해서는 적합하지 않다. 따라서 한국철도공사에서 추진하고 있는 ATP 구축사업의 지상설비와 연계될 수 있는 ATP 차상장치를 설치하여 시험을 하여야 한다. 본 논문에서는 이를 위한 틸팅열차와 ATP 차상장치와의 인터페이스에 대해 연구하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.2
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• pp.256-263
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• 2009

KORAIL carries out an improvement project of railway signaling system for the conventional line from the existing method which permits a train to move within limited speed the ground signal of ATS(Automatic Train Stop) system. The proposed system makes possible that a train can be driven using a speed profile created by onboard signaling system(ATP) with the movement authority from ground balise. A driving test over 100,000km is being executed by developing a tilting train for the speed elevation on the conventional line. And, the introduction of the tilting train by ATP system to the Jung-ang line is expected. However, a speed elevation on a curved line section has a restriction. Therefore, research on safety braking model and train separation control technology for the localization of ATP system is required preferentially. In this paper, we presented a safety braking model of ATP system and a train separation control method that use ground balise as variable information provider, and executed a performance simulation.

• Proceedings of the KSR Conference
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• 2006.11b
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• pp.1448-1453
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• 2006

The Seoul Metro Line No.1 is a very complex service line which carries over 620 thousand passengers a day as a linked line to the satellites of the Seoul Metropolitan. Since the Line No.1 had its voyage service in 1974. it has been aged by the time, which resulted in the needs for the refurbishment to the new system, and as its system refurbishment was suggested to be implemented without any stop of the service, the signaling system interoperability was planned for this refurbishment, and finally it became a desirable reference of the metro signaling system overall refurbishment

• Journal of the Institute of Convergence Signal Processing
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• v.4 no.4
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• pp.30-39
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• 2003

In this paper, we carried out the performance evaluation of HM-Net(Hidden Markov Network) speech recognition system for Korean speech databases. We adopted to construct acoustic models using the HM-Nets modified by HMMs(Hidden Markov Models), which are widely used as the statistical modeling methods. HM-Nets are carried out the state splitting for contextual and temporal domain by PDT-SSS(Phonetic Decision Tree-based Successive State Splitting) algorithm, which is modified the original SSS algorithm. Especially it adopted the phonetic decision tree to effectively express the context information not appear in training speech data on contextual domain state splitting. In case of temporal domain state splitting, to effectively represent information of each phoneme maintenance in the state splitting is carried out, and then the optimal model network of triphone types are constructed by in the parameter. Speech recognition was performed using the one-pass Viterbi beam search algorithm with phone-pair/word-pair grammar for phoneme/word recognition, respectively and using the multi-pass search algorithm with n-gram language models for sentence recognition. The tree-structured lexicon was used in order to decrease the number of nodes by sharing the same prefixes among words. In this paper, the performance evaluation of HM-Net speech recognition system is carried out for various recognition conditions. Through the experiments, we verified that it has very superior recognition performance compared with the previous introduced recognition system.

• Journal of Advanced Navigation Technology
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• v.10 no.3
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• pp.205-212
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• 2006

In this paper, the numerical methods of searching the optimal position of optical phase conjugator (OPC) and the optimal dispersion coefficients of fiber sections are proposed, which are able to effectively compensate overall channels in $8{\times}40$ Gbps WDM system with non zero - dispersion shifted fiber (NZ-DSF) as an optical fiber. And the compensation characteristics in the system with two induced optimal parameters are compared with those in the system with the currently used mid-span spectral inversion (MSSI) in order to verify the availability of the proposed methods. It is confirmed that the compensation extents of the distorted 8-channel signals are improved within 2 dB power penalty by applying the induced optimal parameters into WDM system. It is also confirmed that two optimal parameters less related with the searching procedure of these optimal values, only if these depend on each other.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.1251-1256
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• 2008

Urban railway system has make rapid progress ever since Seoul metro line No.1 was opened in 1974. Now, it is time to prepare system maintenance scheme and procedure that can be available even after 30 years from now. Especially, signaling system must be chosen with considering its life cycle since the system is categorized into electronic equipments. As for current signaling system, mechanical components such as relays has decreased while communication and S/W has integrated in order to implement its correct function. Therefore, it is required to establish system review and switch-over scheme with considering operational environment, maintenance system and an operator. In this paper, therefore, we analyzed various factors - technical, operational and economic - that have effect on system improvement so as to prevent making any mistakes on system improvement.