• Title, Summary, Keyword: Priority of advanced transit system

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Empirical Analysis on Priority Evaluation of Advanced Urban Transit Systems Considering Weights of Public Transportation System Characteristics (대중교통수단 특성의 중요도를 고려한 신교통시스템 평가 실증분석)

  • Kim, Hyunwoong;Moon, Daeseop;Moon, Jungwook;Kim, Mirye;Lee, Jinsun
    • Journal of the Korean Society for Railway
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    • v.17 no.1
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    • pp.79-85
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    • 2014
  • This paper presents an evaluation method that considers the weights of many characteristics of a public transportation system; this method facilitates the selection of suitable advanced transit system in a transportation investment plan. The method sets up twelve evaluation items separated by the following influence factors: users, community, government and operators. It then evaluates the advanced transportation system by analyzing the weights. For an empirical analysis, the urban advanced transportation systems for the main transit of small and medium sized cities were evaluated using the AHP method. The result revealed that the weight order is safety, rapidity and punctuality, convenience, and regional activation, and the priority order is steel wheel-type AGT, LIM, and rubber wheel-type AGT.

The traffic management system for Emergency Vehicles based on DSRC System (DSRC 시스템 기반의 긴급차량을 위한 교통 관리 시스템)

  • Choi Kwang-Joo;Kim Dae-Hyuk;Yoon Dong-Weon;Park Sang-Kyu
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.43 no.9
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    • pp.40-48
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    • 2006
  • In this paper, we propose the EPTS(Emergency vehicle Priority Transit system) for a rapid drive or emergency vehicles at the crossroads. The EPTS is one part of real-time traffic management system in the advanced traffic management system. The EPTS needs the connection or a traffic control system and a DSRC system. It can be applied to the real traffic situation considered with other traffic elements. As the result it is possible for the EPTS to nonstop drive because it induces an efficient drive of emergency vehicles. It is also relatively safe at the crossroad, it is expected that the EPTS is suitable for a telematics service which values efficiency above everything else.

Point-to-Multipoint Services and Hierarchical QoS on PBB-TE System (PBB-TE 기반의 패킷전송시스템에서 멀티캐스트 서비스와 계층적 QoS 구현)

  • Lee, Won-Kyoung;Choi, Chang-Ho;Kim, Sun-Me
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37 no.6B
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    • pp.433-442
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    • 2012
  • We have proposed a solution to multicast services and an advanced quality of service (QoS) mechanism on a packet transport system (PTS) based on PBB-TE. The point-to-multipoint (PtMP) connection in the PBB-TE system have been realized by grouping point-to-point (PtP) PTL trunks and mapping a BSI onto the PtP PTL trunks using a multicast backbone destination address. To provide end-to-end QoS of the PtMP services, the hierarchical QoS scheme for backbone service instances and connection-oriented paths has been implemented in the PTS. For providing different capabilities for service selection and priority selection, the PTS offers to customers three basic types of the port-based, C-tagged, and S-tagged service interface defined by the IEEE 802.1ah. To offer to customers different capabilities of the layer 3 applications and services, moreover, an IP-flow service interface have been added. In order to evaluate traffic performance for PtMP services in the PTS, the PtMP throughputs for the link capacity of 1 Gbps at the four service interfaces were measured in the leaves of the ingress edge node, the transit node, and the egress edge node. The throughputs were about 96 % because the B-MAC overhead of 22 bytes occupies 4% of the 512-byte packet. The QoS performance is ability to guarantee an application or a user a required bandwidth, and could be evaluated by the accuracy of policing or shaping. The accuracy of the policing scheme and the accuracy of the shaping scheme were 99% and 99.3% respectively.