• 제목/요약/키워드: Transportation

검색결과 15,015건 처리시간 0.281초

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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    • 제6권2호
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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.

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

  • 김신원
    • 교통기술과정책
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    • 제2권2호
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    • pp.53-78
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    • 2005
  • 지역교통계획과정에서 중요한 요소의 하나는 교통계획과 실행을 위한 관할구역 판단에서의 일관성인데 각 관할기관이 그 관할구역의 범위 안에서만 교통시설에 대한 권한을 갖는다. 계획과정에서 그러한 일관성을 획득하기 위해서는 MPO들이 협력, 계속성, 종합의 3C(cooperation, continuing, cooperative)와 종합적이고 일관성 있는 교통계획과정(요구되긴 하나 연방정책이나 프로그램에 의해 꼭 제약받지는 않는)을 갖는 것이 필수 불가결하다. MPO들은 도시화 지역을 위한 교통계획과 프로그램을 개발하는데 있어 주와 지역도시들, 관계기관들과 협력적이어야 한다. 이 교통계획과정은 지역도시와 군들의 종합적으로 계획된 개발과 일관성 있는 계획과 프로그램들로 결과되어 진다. 이 협력적인 교통의사결정과정은 멤버인 관할기관이 그 자격을 위한 지역교통이슈와 계획교통개선을 하기 위한 포럼을 제공한다. 각 도시와 군의 레벨에서, 계획 부서의 교통계획가들이 지역자본시설계획(Capital Facility Plan, CFP)과 지역 교통개선프로그램(Transportation Improvement Program, TIP)을 통해 계획과정을 수행하는데 반해, 공공사업(Public Works)부서의 교통기술자들은 예측되는 혹은 예상되는 교통수요를 맞추는 시설을 설계하고 건설하는 일을 하도록 되어 있다. MPO 스태프들은 지역도시와 군들에 지역맥락과 연방정책 및 프로그램들의 가이드 내에서 종합적이고 일관성 있는 교통자료와 정보를 제공하도록 되어 있다. MPO들은 특히 지역교통수요분석과 예측에서 그러한 전문성이 없는 도시와 군들에 기술적 조력을 제공하도록 되어 있다. MPO의 지역교통계획에 대한 원칙과 가이드는 도시들, 군들, 다른 기관들의 참여(상향식 계획과정인 공공참여를 포함하여)에 의해 개발되어진다. 모든 참여자들은 지역교통 계획에서 지역 목적과 목표를 달성하기 위해 함께 일하게 된다.

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

  • 김동준;김혜자;장원재;성현곤
    • 대한교통학회지
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    • 제24권4호
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    • pp.81-91
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    • 2006
  • 최근 지속가능 한 개발에 대한 관심이 높아지면서 교통분야에서도 지속가능 한 개발을 위한 대중교통활성화에 많은 노력을 기울이고 있으며, 대중교통육성법 제정, 대중교통분야의 투자확대, 대중교통체계개편 등의 다양한 정책들이 시행되고 있다. 이와 같이 대중교통에 대한 중요성이 어느 때보다도 높은 시기에, 현재의 대중교통경쟁력 수준을 평가하는 것은 매우 중요한 과정이라 할 수 있다. 이를 통해 현재까지의 대중교통정책 및 그 효과에 대한 이해의 폭을 넓힐 수 있고 향후 효과적인 대중교통정책을 수립하는데 도움을 줄 수 있기 때문이다. 그러나 기존의 연구는 대중교통의 전반적인 경쟁력 수준을 평가하기에는 미흡한 점이 많았으며 국제비교연구 또한 전무한 실정이다. 본 연구에서는 대중교통의 여러 평가요소를 고려한 12개의 평가지표 선정하고, 요인분석을 통하여 4개의 요인을 선정하였으며, 선정된 요인을 이용하여 군집분석을 실시하여 60개의 세계주요도시를 8개의 군집으로 분류하고 대중교통경쟁력수준을 평가하였다. 또한 지역(대륙)별 도시들 및 서울시의 대중교통특성을 파악하였으며, 각 도시의 대중교통경쟁력수준과 대중교통수단분담률의 관계를 다중회귀분석을 이용하여 분석하였다.

Maritime Transportation Planning Support System for a Car Shipping Company

  • Park, Byung-Joo;Choi, Hyung-Rim;Kim, Hyun-Soo;Jun, Jae-Un
    • 한국항해항만학회지
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    • 제32권4호
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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.

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

  • 나연일;이재봉;김재문;김양수
    • 전기학회논문지
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    • 제64권10호
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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℃.

What Drives Residents Low Carbon Transportation Commuting? Evidence from China

  • Li, Liang;Tan, Meixuen;Sun, Huaping;Sanitnuan, Nuttida
    • Asia Pacific Journal of Business Review
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    • 제6권1호
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    • pp.21-48
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    • 2021
  • Promoting low carbon transportation adoption is important for energy saving. Some prior studies have discussed on environmental values affect low carbon transportation commuting is inconclusive. This study has constructed the environmental values, utility value, and social influence-based low-carbon transportation adoption model through the theory of the technology acceptance model and VBN model and the IS success model. Through the SEM model and stepwise regression analysis, we have found that environmental values positively affect utility value, and utility value also positively affects the behavior adoption of low carbon transportation. The utility value as mediating effect in the relationship between environmental values and low carbon transportation commuting behavior. Besides, we also have found that social influence positively impacts the behavior adoption of low carbon transportation. It better enhances the level of household residents' environmental values and utility values, and social influence for promoting the adoption of low carbon transportation. This present research provides theoretical guidance and suggestions for promoting the development of low-carbon transportation innovation.

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

  • 방연근;김현웅
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2000년도 춘계학술대회 논문집
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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
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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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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교통정책평가에 있어 Logit모형의 한계 : Logit모형에 있어서의 기대효용 (Limits of Logit Models in Transportation Policy Evaluation : Expected Utilities in Logit Models)

  • 조중래
    • 대한교통학회지
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    • 제5권1호
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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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교통연구에 있어서의 컴퓨터 그래픽스 응용에 관한 연구 (Applications of Computer Graphics for Transportation Studies)

  • 김광식;최윤철
    • 대한교통학회지
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    • 제4권2호
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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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