• Title, Summary, Keyword: The metro

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Dynamic analysis of metro vehicle traveling on a high-pier viaduct under crosswind in Chongqing

  • Zhang, Yunfei;Li, Jun;Chen, Zhaowei;Xu, Xiangyang
    • Wind and Structures
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    • v.29 no.5
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    • pp.299-312
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    • 2019
  • Due to the rugged terrain, metro lines in mountain city across numerous wide rivers and deep valleys, resulting in instability of high-pier bridge and insecurity of metro train under crosswind. Compared with the conditions of no-wind, crosswind triggers severer vibration of the dynamic system; compared with the short-pier viaduct, the high-pier viaduct has worse stability under crosswind. For these reasons, the running safety of the metro vehicle traveling on a high-pier viaduct under crosswind is analyzed to ensure the safe operation in metro lines in mountain cities. In this paper, a dynamic model of the metro vehicle-track-bridge system under crosswind is established, in which crosswind loads model considering the condition of wind zone are built. After that, the evaluation indices and the calculation parameters have been selected, moreover, the basic characteristics of the dynamic system with high-pier under crosswind are analyzed. On this basis, the response varies with vehicle speed and wind speed are calculated, then the corresponding safety zone is determined. The results indicate that, crosswind triggers drastic vibration to the metro vehicle and high-pier viaduct, which in turn causes running instability of the vehicle. The corresponding safety zone for metro vehicle traveling on the high-pier is proposed, and the metro traffic on the high-pier bridge under crosswind should not exceed the corresponding limited vehicle speed to ensure the running safety.

A Study on Construction of Metro Rapid Transit Network in Daegu Area (철도와 지역발전 - 대구권 광역전철망 구상과 지역발전 효과)

  • Han, Keun-Soo
    • Proceedings of the KSR Conference
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    • pp.27-41
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    • 2008
  • Construction of metro transportation infra is a large-scale project requiring tremendous financial resources. This study suggests operation method to use for rapid transit line existing infra such as Gyeongbu line and spare line capacity following second phase KTX construction. Reviewing various constraints of metro rapid transit operation, we found that the conditions for metro rapid transit operation are already satisfied in Daegu area, just like the case of Gyeongbu line in Seoul Metro area. Also, the evaluation of the economic feasibility of metro rapid transit operation in Daegu area shows that B/C is about 2.4, which implies that there is sufficient economic feasibility. According to the result of sensitivity analysis, the project is economically feasible unless the passenger demand decreases 15% and construction costs increases more than 70%. B/C is evaluated large because the utilization of already exiting infra lowers the initial cost. As one of mass transportation system of large capacity, metro rapid transit can generate significant spillover effect: It will strengthen competitiveness of metro area by connecting cities within the area and by extending one-day life zone of the area, to say nothing of the benefit of improving traffic condition. The construction of metro rapid transit network is necessary for the mass transportation system of Yeongnam area as well as Daegu area, and it may work as a starting point for uniting Daegu and Gyeongbuk and strengthening regional competitiveness.

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Exploring Synergistic Effect in Metro Station Areas: A Case Study of Shanghai, China

  • Zhuang, Yu;Zhang, Lingzhu
    • International Journal of High-Rise Buildings
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    • v.5 no.2
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    • pp.105-115
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    • 2016
  • In the process of exploring sustainable development, major cities in China are expanding metro systems as a strategy to reduce the negative environmental and social consequences of fast-paced motorization. A metro station is not only a transportation node, but also a place where diverse activities can be performed. Therefore, the realization of the spatial potential for human interaction is the essence of the strategy for integrated development in metro station areas. For this paper, 10 well-developed metro stations in Central Shanghai were selected to investigate the correlation between accessibility and spatial performance in station areas. The spatial performance in station areas is significantly affected by metro configuration. However, both vehicle and pedestrian accessibility show weak influence on spatial performance. A synergistic model was then developed to provide quantitative support for transit-oriented development in metro station areas.

Analysis of Multiple Network Accessibilities and Commercial Space Use in Metro Station Areas: An Empirical Case Study of Shanghai, China

  • Zhang, Lingzhu;Zhuang, Yu
    • International Journal of High-Rise Buildings
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    • v.8 no.1
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    • pp.49-56
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    • 2019
  • Against the background of the rapid development of the Shanghai Metro network, this paper attempts to establish an analytical approach to evaluate the impact of multiple transport network accessibilities on commercial space use in metro station areas. Ten well-developed metro station areas in central Shanghai are selected as samples. Commercial space floor area and visitors in these areas are collected. Using ArcGIS and Spatial Design Network Analysis, the Shanghai Metro network and road network are modeled to compute diversified transport accessibilities. Evidence from land use and commercial space floor area within a 0-to-500-meter buffer zone of stations is consistent with location and land-use theory: commercial land use is concentrated closer to stations. Correlation analysis suggests that hourly visitors to the shopping mall are mainly influenced by metro network accessibility, while retail stores and restaurants are affected by both metro and pedestrian accessibility.

Metro Sexual Formative Beauty Expressed in Men's Fashion on the 21C

  • Lee Hyo-Jin
    • International Journal of Costume and Fashion
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    • v.4 no.2
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    • pp.18-29
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    • 2004
  • The purpose of this study was to analyze the formative beauty of metro sexual expressed on the 21C men's fashion. in 21C, metro sexual is being accepted as an object to lead the world consumption culture, and it is said to be most appropriate to the definition as a model that can determine the most modern men. Moreover, with well being life style, it shows characteristic that expresses chic sense through fashion. The results of the study were as below. 1. In recent men's wear, sensory feminine that looks young and trendy is being presented through clothes, rather than the image of men who are strong. Therefore, by wearing splendid flower print, bold color and gorgeous accessories, men send off their attractions. 2. The recent body king syndrome gave new aesthetic value on men's body. Therefore, men's body is becoming cultural icon of metro sexual as another face that shows social status and cultural taste. 3. The men's image of metro sexual that is felt from softer skin and hair than women, and well-built body is appealing more through body conscious look. Here, men's body silhouette is being sublimated aesthetically through design with various materials such as see-through and leather etc., and this is body conscious image that can be seen only in metro sexual. Like this, metro sexual fashion sense was expressed by feminine softness sometimes, and beautiful body silhouette sometimes by expressing one's sexiness enough, being away' from conceptual masculine. Therefore, the appearance of metro sexual can be understood that men's body exposure is becoming a social virtue that expresses beauty.

A Study on The Security of ATM-Metro Service (ATM-Metro 서비스 보안성 분석)

  • Roh, Sun-Sik;Cho, Jung-Ho;Lee, Dong-Eun
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.1
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    • pp.917-920
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    • 2005
  • 본 논문에서는 광대역통합국가망에서 ATM-Metro 서비스의 망 구조 및 서비스 제공 방식을 분석한다. ATM-Metro 서비스를 제공함에 있어서 존재하는 보안 취약점 및 보안 공격을 분석하며, 이를 기반으로 안전하게 ATM-Metro 서비스를 제공하기 위한 일반적인 보안 강화 방안을 제시하고, ATM 접속 방식과 이더넷 접속 방식의 ATM 구간에서 보안 기능을 강호하기 위한 보안 모델을 제시한다. 또한 ATM-Metro Ethernet 구간에서 기본적인 보안 기능을 제공할 수 있는 VLAN 적용 방안을 제시하고, ATM-Metro서비스 전구간에서 보안성을 강화할 수 있는 방안을 제시한다.

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