• Title/Summary/Keyword: Transportation

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Estimating the Efficiency of Transportation Energy Consumption based on Railway Infrastructure and Travel behavior Characteristics

  • Choi, Hyunsu;Nakagawa, Dai;Matsunaka, Ryoji;Oba, Tetsuharu;Yoon, Jongjin
    • International Journal of Railway
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    • v.6 no.2
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    • pp.33-44
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    • 2013
  • In recent years, energy consumption in the transportation sector by expanding motorization continues to increase in almost every country in the world. Moreover, the growth rate of the transportation energy consumption is significantly higher than those of the civilian and industrial sectors. Therefore, every country strives to reduce its dependence on private transport, which is the main contributor to the transportation energy consumption. In many countries, concepts such as Transit Oriented Development (TOD) or New Urbanism, which controls road traffic by increasing the proportion of the public transportation significantly, have been implemented to encourage a modal shift to public transport. However, the level of change required for eliminating environmental problems is a challenging task. Minimizing transportation energy consumption by controlling the increase of the traffic demand and maintaining the level of urban mobility simultaneously is a pressing dilemma for each city. Grasping the impact of the diversity of the urban transport and infrastructure is very important to improve transportation energy efficiency. However, the potential for reducing urban transportation energy consumption has often been ineffectively demonstrated by the diversity of cities. Therefore, the accuracy of evaluating the current efficiency rate of the urban energy consumption is necessary. Nevertheless, quantitative analyses related to the efficiency of transportation energy consumption are scarce, and the research on the current condition of consumption efficiency based on international quantitative analysis is almost nonexistent. On the basis of this background problem definitions, this research first built a database of the transportation energy consumption of private modes in 119 cities, with an attempt to reflect individual travel behaviors calculated by Person Trip data. Subsequently, Data Envelopment Analysis (DEA) was used as an assessment method to evaluate the efficiency of transportation energy consumption by considering the diversity of the urban traffic features in the world cities. Finally, we clarified the current condition of consumption efficiency by attempting to propose a target values for improving transportation energy consumption.

AN OVERVIEW OF REGIONAL TRANSPORTATION PLANNING PROCESS (지역 교통계획과정의 개관)

  • Kim, Shinwon
    • Transportation Technology and Policy
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    • v.2 no.2
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    • pp.53-78
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    • 2005
  • This is to introduce and overview regional transportation planning processes in the southwest region of the State of Washington, USA. First, significant roles of Growth Management Act (GMA) of the State of Washington in transportation planning are examined. Major functions and roles of Southwest Washington Regional Transportation Council (RTC) as an MPO in the southwest region of the State of Washington, are reviewed mainly from the regional transportation planning perspectives by examining regional transportation planning programs and coordination among the state and local cities and counties. Finally, processes and roles of Metropolitan Transportation Plan (MTP) are discussed. Regional transportation planning processes in a case of the southwest region of the State of Washington may be considered as a reference in regional transportation planning efforts in Korea.

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A Comparison of Public Transportation Competitiveness in World Major Cities (세계주요도시의 대중교통 경쟁력 비교)

  • Kim, Dong-Jun;Kim, Hye-Ja;Jang, Won-Jae;Seong, Hyeon-Gon
    • Journal of Korean Society of Transportation
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    • v.24 no.4
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    • pp.81-91
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    • 2006
  • As public transportation is significant mode to make sustainable urban transportation system, the importance of Public transportation has grown gradually. Nowadays the central and local government make various policies which help to raise modal sp)it of public transportation. To understand previous public transportation Policies and make more efficient policies, it is important to know the current level of public transportation exactly. The main aim of this study is assess the competitiveness of public transportation in world major cities We select assessment indexes and have grouping use factor analysis. Then we have 8 clusters of cities by cluster analysis, Also, we analyze the relationship between public transportation characteristics and modal split.

Maritime Transportation Planning Support System for a Car Shipping Company

  • Park, Byung-Joo;Choi, Hyung-Rim;Kim, Hyun-Soo;Jun, Jae-Un
    • Journal of Navigation and Port Research
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    • v.32 no.4
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    • pp.295-304
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    • 2008
  • In order to achieve a sustainable competitive advantage in the expanding maritime transportation market, most shipping companies are making every effort to reduce transportation costs. Likewise, the car shipping companies, which carry more than 80% of total car import and export logistics volume, also do their utmost for transportation cost saving. Until now many researches have been made for efficient maritime transportation, but studies for car shipping companies have rarely been made. For this reason, this study has tried to develop a maritime transportation planning support system which can help to save logistics costs and increase a competitive power of car shipping companies. To this end, instead of manual effort to solve the routing problem of car carrier vessels, this study has used an integer programming model to make an optimal transportation planning at the minimum cost. Also in response to the frequent changes both in the car production schedule and ship's arrival schedule after the completion of transportation planning, this research has developed a decision support system of maritime transportation, so that users can easily modify their existing plans.

A Study on the Behavior Characteristics of a Tensioning Device of a Catenary System According to the Longitudinal Dynamic Displacement of Railroad Bridge (철도교량의 종방향 동적 변위에 따른 전차선로 장력조정장치 거동특성에 관한 연구)

  • Na, Youn-Il;Lee, Jae-Bong;Kim, Jae-Moon;Kim, Yang-Su
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.10
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    • pp.1517-1522
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    • 2015
  • Since electric railroad vehicle pass through repeatedly on the railroad bridge, the dynamic load that causes the change of tension of contact wire affect it constantly. In this paper, we measured the dynamic displacement of the railroad bridges to analyze the effect of tension in the catenary. A result of dynamic measurement of the longitudinal displacement, it's maximum value was 39.9mm which was lower than the primary management criteria 378mm. Also on the based of a maximum temperature, it shows a feature that the longitudinal displacement value increased as temperature rise from April to October. In terms of behavior characteristics of a tensioning device, it was confirmed to be the value of 50mm stroke movement when the temperature changes ±5℃.

A Proposal for the Evaluation Method Improvement of Transport Investment with the Transportation Policy Change (교통정책변화에 따른 교통투자평가방법 개선에 관한 제언)

  • 방연근;김현웅
    • Proceedings of the KSR Conference
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    • pp.43-50
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    • 2000
  • This paper shows the recent changes of national transportation policies in some developed countries and argues that the evaluation method of the effect of transportation investment on national economy should be improved to reveal real impact of the investment. The evaluation method should develope effective performance indicators of the goals set in national transportation policy. To estimate correctly the magnitude of transportation services in national economy, the evaluation method also provides a way to measure in-house transportation services and to overcome the limits of marginal effect equal equation.

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A Public-Transportation Guidance System using the GIS and the GA

  • Jun, Chul-Min
    • Proceedings of the KSRS Conference
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    • pp.21-23
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    • 2003
  • Developing a public transportation guidance system requires the following aspects: (i) people may change transportation means not only within the same type but also among different modes such as between buses and subways, and (ii) the system should take into account the time taken in transfer from one mode to the other. This study suggest the framework for developing a public transportation guidance system that generates optimized paths in the transportation network of mixed means including buses, subways and other modes. For this study, the Genetic Algorithms are used to find the best routes that take into account transfer time and other servicetime constraints.

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Applications of Computer Graphics for Transportation Studies (교통연구에 있어서의 컴퓨터 그래픽스 응용에 관한 연구)

  • 김광식;최윤철
    • Journal of Korean Society of Transportation
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    • v.4 no.2
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    • pp.59-72
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    • 1986
  • The purposes of this paper are to review the concept and system structure of computer graphics and to discuss the applicability of computer graphics technique as an analysis tool in transportation studies. To do this, several applications of computer graphics used for analyzing and solving transportation system problems were described and illustrated. The results indicate that computer graphics are found to be powerful aids to the analysis and design of transportation systems that typically involve large data bases and several interacting components. The results also indicate that computer graphics can be a powerful tool for aiding planner, decision maker and citizen in making it easier to explain and interpret information through mapping and graphic display.

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Limits of Logit Models in Transportation Policy Evaluation : Expected Utilities in Logit Models (교통정책평가에 있어 Logit모형의 한계 : Logit모형에 있어서의 기대효용)

  • 조중래
    • Journal of Korean Society of Transportation
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    • v.5 no.1
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    • pp.25-31
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    • 1987
  • This article shows that, in the logit models, the(conditional) expected utility of the decision makers choosing an alternative is invariant across all alternatives. This property of the logit model implies that the logit model can not explain the distributional wealfare effects of a transportation policy (or transportation investment) among different alternatives, and thus the logit model is not proper for evaluating transportation policy in equity aspects.

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Railway strategies for introducing intelligent transportation system (철도분야 지능형교통체계 도입 전략)

  • Lee, Jun;Moon, Dae-Sub;Eom, Jin-Ki;Kim, Dong-Hee;Jin, Il-Kyoung
    • Proceedings of the KSR Conference
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    • pp.1544-1549
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    • 2011
  • Transportation Efficiency Act of 2009 System National Integrated Transportation System Efficiency Act and the revised Road Traffic in the center of the Intelligent Transportation Systems rail, sea and air transport sector is expanding in various areas to promote business and Industry is planning to. Accordingly, the introduction of Intelligent Transportation Systems Outlook and Direction of the railway sector and to provide a comprehensive introduction of Intelligent Transportation Systems rail sector has raised the need. In this paper, the introduction of Intelligent Transportation Systems rail sector strategy is presented as follows. First, the rail users a convenient rail-centric information system used. Second, the reliability and value-added operating system built for the creation of high-tech rail. Third, crime and accidents are implemented in a safe railway. The results of this paper, the railway sector through the national Intelligent Transportation Systems to develop and introduce strategies to provide operational direction is expected to be present.

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