차지상간 통합전송시스템의 무선 대역폭 및 시스템에 관한 연구

정상국(Jeong Sang-Guk),최갑봉(Choi Gab-Bong),안태기(An Tae-Ki),김백현(Kim Back-Hyun),양동석(Yong Dong-Seok) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-

In this paper, We studied efficient design of wireless transmission system for unified data transmission in a subway and railway. It is increased that need of broadband multimedia service to make useful environment for user and to support the operation of railway system. High bandwidth is better if we need more services. But, high bandwidth requires more cost at tunnel of subway. More bandwidth make receive sensitivity to bad. So it need more wireless Station. We deduced best bandwidth of subway wireless transmission system reflecting the cost of installation and efficiency of system. Consequently, we decide efficient service model of broadband wireless system at a subway. Subway broadband wireless transmission system is tested in this year, and it is to be extended to province subway. Cost of subway broadband wireless transmission system is saved, because the system can be efficently designed. Therefore, the effectiveness is expected to be very big.

이용자 편의증대를 위한 운임제도 대안 정책연구

정경덕(Kyeong-Duk Jeong),최갑봉(Gab-Bong Choi),유영희(Yeong-Hee Yoo),이향숙(Hyang-Sook Lee) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05

서울시는 ’15.6.27 대중교통요금인상과 아울러 국내 최초로 조조할인제를 시행하였다. 첫차부터 오전 6 시 30 분까지 지하철과 버스를 이용하면 요금을 20% 할인해주는 것으로 제도 시행 1 년간 총 6,940 만명(하루 22 만명)이 할인혜택을 받은 것으로 분석되고 있다. 본 논문에서는 교통수요에 탄력적인 요금제 도입형태로서의 조조할인제도의 도입효과 분석과 함께 기존 정기권 제도의 문제점 개선 방안, 해외 선진도시의 다양한 외국인 대상요금할인제도 사례 조사 등을 통해 통근 통행자 및 외국인을 위한 보다 적극적인 할인제도를 연구, 기술하였다. Effective from "15.6.27, Seoul City was performed public transport fare hikes as well as the “Free Pre-Peak Travel ”(early morning discount fare) at the first time in Korea. “Early morning discount fare” means that you get a 20% discount on the fare if you take the subway and bus from the first train start time to 6:30 am. Enforcement one years, total 6,940 million people (22 million people a day) have been analyzed to receive the discount. In this paper, through traffic demand flexible pricing introduced form as “Free Pre-Peak Travel”(early morning discount fare) problems improvement of discounts existing commuter pass system with the introduction effects of institutional measures, various foreigners fare discount system case studies, such as overseas advanced cities aggressive than for commuting parties and foreign discount research institutions, and technology.

18GHz 차지상간통합데이터전송 시스템의 지하 및 지상구간 무선특성 분석

정상국,안태기,김백현,최갑봉,Jeong, Sang-Guk,An, Tae-Ki,Kim, Baek-Hyun,Choi, Gab-Bong 한국정보통신학회 2009 한국정보통신학회논문지 Vol.13 No.6

차지상간 통합데이터전송 시스템에서 사용하는 18GHz는 다중경도페이딩의 영향이 크고, 회절이 되지 않아 전파의 도달 범위가 송신각과 수신각에 따라 크게 영향 받는다. 본 논문은 차지상간통합데이터전송 시스템에서 지하구간의 전파 특성과 지상 구간의 전파 특성을 비교하였다. 18GHz 차지상통합데이터전송 시스템에 주로 사용되는 지향성 무선안테나인 이득이 15dBi 와 10dBi인 안테나를 사용했을 경우를 가정하여 반경이 100, 200, 400인 선로에 대하여 표준적인 특성을 지상선로구간과 지하터널구간으로 나누어 비교하였다. 이때 송수신 특성은 한국철도기술연구원의 차지상간통합전송의 OFDM모뎀방식의 샘플시료의 송신 출력은 20dBm, 수신감도는 -90dBm을 사용하여 시뮬레이션하였다. In 18GHz using unified data transmission in a subway and railway, Influence of the multipath fading is big and an arrival range of the micro wave takes the influence greatly according to the transmit angle and receive angle because it not diffracted. This thesis analyzed microwave property underground tunnel and ground railway at unified data transmission in subway and railway. Antenna gain of directional antenna many used unified transmission in an subway and railway, is used 15dBi and 10dBi in simulation. Transmitter's property is compared underground tunnel to ground railway about curved railway of R=100, R=200, R=400. Specification of transmitter is used sample unified transmission system in subway and railway of KRRI(korea railroad research Institute). Transmitter's power is 20dBm and Reciever's sensitivity is -90dBm. According to result of simulation.

열차객실감시시스템의 제한된 무선 대역폭에서의 최적의 서비스모델에 대한 연구

정상국(Jeong Sang-Guk),최갑봉(Choi Gab-Bong),안태기(An Tae-Ki),김백현(Kim Back-Hyun),양동석(Yang Dong-Seok) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10

In this paper, We studied optimum service model of passenger car monitoring system at limited wireless bandwidth subway and railway. High bandwidth is better if we need more services. But, high bandwidth requires more cost at tunnel of subway. More bandwidth make receive sensitivity to bad. We deduced best bandwidth of subway wireless transmission system reflecting the cost of installation and efficiency of system. Consequently, we decide efficient service model of passenger car monitoring system.

18GHz 차지상간 양방향 영상전송시스템의 도로 및 터널 구간에서 경로손실 특성

정상국(Jeong Sang-Guk),최갑봉(Choi Gab-Bong),안태기(Tae-Ki Kim),김백현(Back-Hyun Park),박종철(Park Jong-Chol),양동석(Yong Dong-Seok) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.4

It is increased that need of broadband multimedia service to make useful environment for user and to support the operation of railway system. So study of integrated data transmission in a subway and railway is activated. The research deals with pass loss characteristics of 18㎓ microwave that is assigned frequency of integrated data transmission in a subway and railway. It is used sample integrated transmission system in subway and railway of KRRI(korea railroad research Institute) at the tunnel and road. Specification of test sample system is blow. It use OFDM modulation, Wireless frequency is 18㎓ and 19㎓, Maximum output power is 20㏈m, Receive sensitivity is -90㏈m. The pass loss exponent and standard variation of road and tunnel is analyzed.

18㎓ 대열차공간화상시스템의 지상구간에서 영상전송특성 시험

정상국(Jeong Sang-Guk),안태기(An Tae-Ki),김백현(Kim Back-Hyun),최갑봉(Choi Gab-Bong),임민혁(Lim Min-Hyuck) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.4

It is increased that need of broadband multimedia service to make useful environment for user and to support the operation of railway system. So study of integrated data transmission in a subway and railway is activated. The research deals with pass loss characteristics of 18㎓ microwave that is assigned frequency of integrated data transmission in a subway and railway. It is used sample integrated transmission system in subway and railway of KRRI(korea railroad research Institute) at the tunnel and road. Specification of test sample system is blow. It use OFDM modulation, Wireless frequency is 18㎓ and 19㎓, Maximum output power is 20㏈m, Receive sensitivity is -90㏈m. The pass loss exponent and standard variation of road and tunnel is analyzed.

지하철 역사내 무선 센서네트워크 환경구축을 위한 무선 스펙트럼 분석 및 전송시험에 관한 연구

안태기(An, Tea-Ki),김갑영(Kim, Gap-Young),양세현(Yang, Se-Hyun),최갑봉(Choi, Gab-Bong),심보석(Sim, Bo-Seog) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.7

지하철 역사에 화재, 테러 등의 내 외부 위험요인을 감시하기 위하여 CCTV와 각종 센서를 이용한 감시시 스템이 구축되어 왔으며, 최근 최신의 IT기술인 센서네트워크기술을 이용한 감시시스템기술 도입이 여러 분야에서 시도되고 있다. 2007년부터 정부 주도하에 지하철 역사의 경우에도 최신의 IT기술인 무선 센서네트워크기술 및 지능 형영상감시기술 등과 접목하여 화재, 제한지역 침입, 승객 혼잡도, 우범지역, 역사 건전성 등을 종합적으로 감시하는 도시철도지능형종합감시시스템 개발 및 구축이 추진 중에 있다. 이를 위하여 본 연구에서는 개발 중인 도시철도 지능형 종합감시시스템의 현장 역사 적용에 앞서 무선센서네트워크 의 대표라 할 수 있는 ZigBee기반의 현장 무선통신환경 시험을 서울지하철 충무로 역사에서 수행하였고, 본 논문에 충무로역사 내부 승강장 및 대합실에서의 ZigBee기반의 무선통신환경 시험결과를 정리, 분석하였다. 승강장 및 대합 실의 무선 스펙트럼분석 결과 ZigBee기반의 센서네트워크의 주파수와 중첩되는 주파수는 없었으며 인접 주파수 또 한 10MHz 이상 이격되어 주파수 간섭을 받지 않는 것으로 나타났다. ZigBee를 이용한 무선데이터 전송 시험 결과, 데이터 전송은 열차의 승강장 진출입시의 영향보다 승강장 혹은 대합실의 이용승객 수 및 유동량에 의한 멀티패스 페이딩(multi-path fading) 효과에 더 큰 영향을 받는 것으로 나타나, 역사에 지능형종합감시시스템 구축 시 이를 고려 하여야 할 것으로 판단된다. In order to monitor internal risk factors such as fire, terror, etc. on the subway station, the surveillance systems using CCTV and various kinds of sensors have been implemented and recently, introduction of surveillance systems using an advanced IT technology, sensor network technology is tried on several areas. Since 2007, Korean government has made an effort to develop the intelligent surveillance and monitoring system, which can monitor fire, intrusion, passenger congestion, health-state of structure, etc., by using wireless sensor network technology and intelligent video analytic technique. For that purpose, this study carried out field wireless communication environment test on Chungmuro Station of Seoul Metro on the basis of ZigBee that is considered as a representative wireless sensor network before field application of the intelligent integrated surveillance system being developed, arranged and analyzed and ZigBee based wireless communication environment test results on the platform and waiting room of Chungmuro Station on this paper. Results of wireless spectrum analysis on the platform and waiting room showed that there is no radio frequency overlapped with that of ZigBee based sensor network and no frequency interference with adjacent frequencies separated 10MHz or more. As results of wireless data transmission test using ZigBee showed that data transmission is influenced by multi-path fading effect from the number and flow rate of passengers on the platform or the waiting room rather than effects from entrance and exit of the train to/from the platform, it should be considered when implementing the intelligent integrated surveillance system on the station.

18㎓ 객실감시시스템의 터널구간에서의 영상전송특성 시험 18㎓ 무선 영상 전송을 위한 OFDM 수신기의 설계

정상국(Jeong Sang-Guk),안태기(An Tae-Ki),김백현(Kim Back-Hyun),최갑봉(Choi Gab-Bong),홍동규(Hong Dong-kyu) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7

The importance of broadband wireless communication implemented at subway tunnels is growing up. At 18㎓ wireless video transmission system, the transmitter requires a digital modulation method. At subway tunnel, A 18GHz's influence of the multi-pass padding is strong. OFDM digital modulation that is strong for multi-pass padding is recommended. In this paper, Suitable to a subway wireless video transmission OFDM receiver is designed. OFDM receiver system has 6㏈ gaion because uses diversity of space diversity and MRC(Maximum Ratio Combining) diversity. The transmitter system use C&ITechnologies's transmitter board. IF frequency of receiver is 480㎒. OFDM modulation parameter is as follow, The bandwidth is 8㎒, The numuber of carrier if 2,000, The modulation methode is QAM16, The guard interval is 1/32.

18㎓ 객실감시시스템의 터널구간에서의 영상전송특성 시험

정상국(Jeong Sang-Guk),안태기(An Tae-Ki),김백현(Kim Back-Hyun),최갑봉(Choi Gab-Bong),박종철(Park Jong-Chol) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월

The importance of broadband wireless communication implemented at subway tunnels is growing up. Specially, passenger monitoring system for the safety of the passenger is requested broadband transmission. The wireless transmission system for broadband video is request bandwidth of over 10 ㎒. Ministry of Information and Communication(MIC) Notifies 18㎓ wireless frequency for subway video transmission system. it is good that bandwidth is reserved sufficiently and influence of an electric wave is little. But, initial path loss is big and influence of multi-pass padding is big. So, electric wave characteristic is very bad. research of transmission characteristic of 18㎓ wireless video transmission system for safety is most important. In this paper. The characteristic of video transmission in tunnel is tested using 18㎓ Microwave sample test system. it use OFDM modulation, transmission output power is 20㏈m, sensitivity of receiver is -90㏈m. The result of test is good quality for all pass of tunnel although multi-pass padding is big.

18㎓ 다중통신을 위한 OFDM송수신 모듈 구현 (Implementation of OFDM Transceiver for Multiple Access at 18㎓)

정상국(Jeong Sang-Guk),안태기(An Tae-Ki),김백현(Kim Back-Hyun),최갑봉(Choi Gab-Bong),박종철(Park Jong-Chol) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5

The importance of broadband wireless communication implemented at subway tunnels is growing up. At 18㎓ wireless video transmission system, the transmitter requires a digital modulation method. At subway tunnel, A 18㎓’s influence of the multi-pass padding is strong. OFDM digital modulation that is strong for multi-pass padding is recommended. Duplexing methode uses FDD to transmit and receive broadband data at the same time. In the case of FDD we assign a private use channel each with the transmission at the receiving. In this paper, We implement multiple access wireless OFDM transceiver. We verified that one ground transceiver communicates with two car transceiver at the same time.