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류상환(Sang-Hwan Ryu),조봉관(Bong-Kwan Cho),이안호(An-Ho Lee),황현철(Hyeon-Chyeol Hwang),양도철(Doh-Chul Yang) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Korean-Automated Guideway Transit (K-AGT) was successfully developed through Light Rail System Development Project. Since then the domestic development rate of on-board signalling system of light rail has been improved up to 90% by Practical Utilization Project of Light Rail. After utilization project furthermore POSCO ICT has developed the wayside signalling system of CBTC including wireless communication equipment. KRRI carried out the performance test of the wireless communication interfacing and using the other CBTC equipments of KyungSan Test Line so as to see whether it conforms IEEE 802.11x international communication standard in view of operational concept of CBTC. In this paper we presents analysis results of roaming test while train runs.
OSGi 기반 상황인지 모바일 헬스케어 시스템 설계 및 구현
송승재,김남호,류상환,신호진,장경수,신동렬,Song, Seung-Jae,Kim, Nam-Ho,Ryu, Sing-Hwan,Shin, Ho-Jin,Jang, Kyung-Soo,Shin, Dong-Ryoel 대한전자공학회 2007 電子工學會論文誌-CI (Computer and Information) Vol.44 No.2
본 논문에서는 JADE 플랫폼과 OSGi 프레임워크의 연동을 통해 더욱 발전된 상황인지 헬스케어 시스템을 제안한다. 기존 헬스케어 시스템들은 매우 수동적인 서비스들만을 제공하고 있으며, 시스템 표준이 정해지지 않아 각각의 시스템 간 호환성이 보장되지 않고 있는 상황이다. 이러한 이유로 본 논문에서는 헬스케어 시스템에 에이전트 표준 플랫폼인 JADE를 적용함으로써 컨텍스트 정보의 효율적인 관리와 자동화된 서비스의 제공을 피한다. 또한, Surrogate System(이하 써로게이트)에 표준 서비스 게이트웨이인 OSGi 프레임워크를 탑재함으로서 국제 산업계 표준을 만족 시키며, 플랫폼이나 응용 프로그램 등에 큰 제약을 받지 않고 헬스케어를 비롯한 다양한 서비스의 제공을 가능하게 한다. 이러한 각 프레임워크들의 이점들을 차용하기 위해 하나의 헬스케어 시스템에 두 개의 플랫폼을 적용하고, 플랫폼 간의 서비스 공유를 위해 OSGi와 JADE간의 연동 기술을 개발한다. 아울러 상황인지 헬스케어 시스템을 지향하기 위하여 컨텍스트 정보를 기반으로 간단한 추론이 가능한 Dummy Context Agent Engine을 개발하여 적용한다. Recently, Healthcare system has not been standardized and has been developed as an embedded system lacking interoperability. We are finally going to face such problems as having excessive load in using network caused by the uncontrolled spread of system and un-guaranteed interoperability among the heterogeneous systems. We suggest the possibility that OSGi and JADE can be accepted as a solution for the above problems.
조봉관(Cho Bong-Kwan),류상환(Ryu Sang-Hwan),백종현(Baek Jong-Hen),조보형(Cho Bo-Hyung) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
Presently metro in our country has higher rate of passengers as a public transportation of urban area than other transportations. And road is under very restrictive condition to be expanded in many aspects because the streets are completely choked. Therefore increase of capacity in metro and reduction of headway has been seriously required and utmost efforts has been taken by related fields to meet the requirements. The concept of CBTC system came out from this background. CBTC system can be implemented to detect the train location without using the track circuits. It has many advantages in aspects of signalling equipments build-up and maintenance. This study investigated examples of radio communication system and applicable standard norms in other countries. And it also reviewed the suggestion for the establishment of radio frequency and radio network to be considered for application train control system by radio under Korean metro environment.
조봉관(Cho, Bong-Kwan),류상환(Ryu, Sang-Hwan),김금비(Kim, Keum-Bee),김용호(Kim, Ronny Yongho) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.10
본 논문에서는 Wireless Access in Vehicular Environments (WAVE)통신을 철도통신에 적용하였을 때 사용할 수 있는 효과적인 패킷 전송 방법을 제안하였다. WAVE통신은 무선랜에 기초한 통신으로 이동체 통신에 적합하도록 개발된 통신방 법으로 Intelligent Transport System (ITS)에 응용하도록 많은 연구가 이루어져 왔다. 철도도 주요 교통수단의 하나로 WAVE 를 이용하면 현재 무선랜 시스템을 이용한 Communication Based Train Control (CBTC)를 포함한 많은 서비스들의 성능을 개선하고 여러 시스템으로 분산되어 있는 서비스들을 WAVE로 통합할 수 있다. 하지만, WAVE를 철도에 사용하기 위해서는 해결되어야 하는 문제점이 존재한다. 가장 단순한 구조인 Single-PHY WAVE는 제어채널(Control Channel, CCH)와 서비스 채널(Service Channel, SCH)을 50ms씩 번갈아가며 통신을 수행한다. 철도 통신은 주로 지연에 민감한 패킷들이 많이 존재하 는데 이러한 동작에서는 성능 열화가 발생할 수 있다. 본 논문에서는 현재 WAVE통신 방법을 상세히 분석한 후 문제점을 도출하고 이러한 문제점을 철도 WAVE 환경에서 해결할 수 있는 새로운 패킷 전송 방법을 제안한다. WAVE 전송 성능을 수학적 모델링을 하여 철도 통신의 요구사항을 만족하는지 여부를 확인하였다. In this paper, an efficient Wireless Access in Vehicular Environment (WAVE) packet transmission scheme for railroad communication is proposed. WAVE communication is a wireless local area network (WLAN) based communication and it is developed to be suitable for vehicular communication. There has been a lot of study on WAVE’s applicability to Intelligent Transport System (ITS). As one of main transportation methods, by using WAVE, quality of railroad communication including WLAN based Communication Based Train Control (CBTC) can be enhanced and variety of railroad communication systems can be integrated into WAVE. However, there are technical challenges to adopt WAVE in railroad communications. For the simplest single-PHY WAVE, time division alternation of 50ms between Control Channel (CCH) and Service Channel (SCH) is required. Since there are delay sensitive railroad traffic types, alternation operation of CCH and SCH may cause performance degradation. In this paper, after identifying a couple of problems based on detailed analysis, a novel packet transmission scheme under railroad environment is proposed. In order to verify if the proposed scheme meets the requirement of railroad communication, WAVE transmission is mathematically modeled.
새로운 신호시스템 도입에 따른 열차운행 보증기술에 관한 고찰
조봉관(Cho Bong-Kwan),류상환(Ryu Sang-Hwan),김종기(Kim Jong-Gi) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
East Japan Railway Company developed an digital ATC signalling system instead of conventional ATC system and now is making progress the construction tokyo area Keihin-Tohoku Line between Minamiurawa and Tsurumi. But replacing into new system with existing ATC system in operation should be performed without affecting current running system and the technology that makes it possible for current system and new system to coexist, initialization of system, preparation for an emergency should be organized not to affect overall system. Controlling method of digital ATC signalling system and "assurance technique" for solving the problems when replacing will be mentioned in this paper.
조봉관(Bong-Kwan Cho),류상환(Sang-Hwan Ryu),이안호(An-Ho Lee),황현철(Hyeon-Chyeol Hwang),박기수(Gi-Su Park) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Korean-Automated Guideway Transit (K-AGT) was successfully developed through Light Rail System Development Project. Since then the domestic development rate of on-board signalling system of light rail has been improved up to 90% by Practical Utilization Project of Light Rail. After utilization project furthermore POSCO ICT has developed the wayside signalling system of CBTC including wireless communication equipment. KRRI carried out the performance test of the wireless communication interfacing and using the other CBTC equipments of KyungSan Test Line so as to see whether it conforms IEEE 802.11x international communication standard in view of operational concept of CBTC. In this paper we presents the test plan test items and the analysis results of maximum communication distance tests between on-board and wayside radio sets.