• Title, Summary, Keyword: Modal Split

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A Multi-modal Continuous Network Design Model by Using Cooperative Game Approach (협력적 게임을 이용한 다수단 연속형 교통망 설계 모형)

  • Kim, Byeong-Gwan;Lee, Yeong-In;Im, Yong-Taek;Im, Gang-Won
    • Journal of Korean Society of Transportation
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    • v.29 no.1
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    • pp.81-93
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    • 2011
  • This research deals with the multi-modal continuous network design problem to resolve the transportation policy problems for constructing and operating transportation facilities with considering the mutual decision-making process between transportation operator and user in the multi-modal network. Particularly, in the consideration of changes in travel pattern between transport modes due to the changes in transportation policy, road network for passenger car and transit network for public transportation are considered together. In the development of network design model, more rational Stackelberg equilibrium(cooperative game) rather than more general Nash equilibrium(non-cooperative game) approach is used and sensitivity analysis considering transport mode is used. A multi-modal continuous network design model in this study is developed for the arbitrary continuous network design parameters(${\epsilon},\hat{\epsilon},p$) of transportation policy decisions. As examples of application and evaluation for these design parameters, the developed model is applied to calculate 1)the optimal capacity of road link in the road transport policy, 2)the optimal frequency of transit line in public transport policy and 3)the optimal modal split in transport modal share policy.

Design of Optical Polarizer using Three-channel Rib-type Couplers (세 채널 Rib형 결합기를 이용한 광 편파기 설계)

  • Hong, Kwon-Eui;Lee, Won-Seock;Ho, Kwang-Chun
    • Journal of IKEEE
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    • v.7 no.1
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    • pp.16-21
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    • 2003
  • A rigorous modal transmission-line theory (MTLT) based on effective dielectric method (EDM) is introduced and developed to analyze the polarization beam-splitting of optical rib-type directional coupler with three guiding layers. Furthermore, to confirm the validity of approach proposed in this paper, we compare our results with those ones of BeamPROP, which is a commercial software package used widely. Consequently, the numerical results reveal that the hybrid modes incident into a guiding channel of rib-type coupler are split well through upper and lower guiding channels in a polarization length.

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A Strategy of Pedestrian Environment Improvement through the Analysis on the Walking Transportation Characteristics in a Big City (보행통행 특성분석에 의한 보행환경개선 추진전략 연구)

  • 김형보;윤항묵
    • Journal of Korean Port Research
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    • v.14 no.3
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    • pp.269-278
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    • 2000
  • Today the pedestrian-related problems a key subject requiring the attention of the traffic engineers for improving the transportation system. Particularly in urban and CBD locations, the pedestrian presents an element of sharp conflict with vehicular traffic. Therefore pedestrian movements must be studied for the purpose of providing guideline for the design and operation of walking transportation systems. This paper is to address the characteristics of walking transportation in a big city. Especially the focuses are emphasized on the ratio occupied by pedestrian traffic among the whole unlinked trips in a city and walking time. The data for analysis are collected in Seoul metropolitan city through sampling 1,006 citizens. Compared with other similar research works this paper utilized diversified tools to acquire more useful results. Finally, policy directions for pedestrian environment improvement were suggested.

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Air Pollution Forecasting Using Urban Transportation Planning Models and Air Pollution Dispersion Models (都市交通計劃 모델과 大氣汚染 擴散모델을 이용한 都市地域 大氣汚染 豫測)

  • 董宗仁;趙康來;金良均;兪 浣
    • Journal of Korean Society for Atmospheric Environment
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    • v.2 no.2
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    • pp.31-40
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    • 1986
  • Motor vehicle related air pollution has become more serious because of rapid increase of number of cars, specially in the urban area. The increase trend seems to be accelerated, however, the fact is that road conditions, parking facilities and traffic control systems are far behind coping with this situation. In spite of the lack of related basic data, urban transportation planning (UPT) and air pollution dispersion models were applied to predict air pollution level. In standard UPT model, trip generation, distribution, modal split and network assignment were estimated by experimental equations and appropriate models. The air pollution level in the central business area was believed to be higher and it will increase continuously due to the increase of traffic demand. To meet this situation, air pollution problem should be considered as a part of integrated plannings of urban plans or transportation plans as well as more stringent motor vehicle emission standards, have to be enforced.

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A Study on Fare Management For Taxicab as a Means of Paratransit in Urban Areas (준대중교통수단으로서 택시교통요율 관리에 관한 연구)

  • 임강원
    • Journal of Korean Society of Transportation
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    • v.2 no.1
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    • pp.3-16
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    • 1984
  • Development of para-transit is imminent in modern metropolis which are galloping toward motorization. Compared with other already industrialize countries, our metropolis can take a vantage of late starter in coping with urban transportation problem. Our metropolis are still heavily relying on public and/or pare-transit in modal split. Current government policy toward taxi-cab, however, seems to contradict with the objective of developing para-transit. If it is not adequately developed, the middle-class people of higher income would have no other option than having their own auto as already been observed. It will centainly accelerate our motorization process so that we follow the model of industrialized countries, and their problems too. Insisting that our transport policy should be drastically reformulated in favor of paratransit in addition to public transit, this study reappraise current policy on taxi-cab with respect to fare, prohibition of shared-ride, and other regulatory measures and propose and management model for taxi fare and operating policy in metropolis.

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A Study on the Walking Transportation Characteristics (걷고싶은 도시조성을 위한 보행 특성 연구)

  • 김형보;윤항묵
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.53.2-60
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    • 2000
  • One of the elements requiring the attention of the traffic engineer is the pedestrian. Particularly in urban and CBD locations ,the pedestrian presents an element of sharp conflict with vehicular traffic. Therefore pedestrian movements must be studied for the purpose of providing guideline for the design and operation of transportation systems. This paper addressed the characteristics of walking transportation in a big city. Especially the focuses are emphasized on the ratio occupied by pedestrian traffic among the whole unlinked trips in a city and walking time. The data for analysis are gathered in Seoul metropolitan city sampling 1,006 citizens. Compared with other similar research works this paper utilized diversified tools to acquire more useful results.

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A Study on Deriving The Diversion Curve of I.C.s (I. C. 유형별 전환곡선식의 도출에 관한 연구)

  • 손진현;이용재
    • Journal of Korean Society of Transportation
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    • v.8 no.2
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    • pp.77-97
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    • 1990
  • Compared to modal split, the methods of forecasting traffic volumes diverted in various types of I.C.s have not been sufficiently studied. The purpose of this study is to derive a new diversion function that can represent the directional traffic volume in accordance with various geometrics of I.C.s. In general, knowing various traffic impedances and the amount of traffic production and attraction, one can estimate proper traffic volumes associated with directions by using a well-defined diversion function. This function is usually made by a series of process such as surveying directional traffic volumes on several I.C.s, analyzing with a regression method and verifying those results by statistical approaches. The function has been developed by rigorous statistical testings, mainly a regression analysis. This paper presents an effective method in planning and designing new roads, I.C.s and route choice of subway. Finally, some comparisons and improvements and suggested when one uses different types of relevant models and functions.

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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.

Deeper Underground Greater Metropolitan Express Train Network Effect (긴급제언 - 대심도 광역지하급행철도 네트워크 효과)

  • Lee, Sun
    • Journal of the Korean Professional Engineers Association
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    • v.42 no.4
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    • pp.45-50
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    • 2009
  • The modal split structure of the Korea's transportation system has been dominated by road-oriented structure. The shortage of the inftrastructure to accommodate the rapidly increasing travel demand has brought about socio-economic losses such as severe traffic congestion and high logistic costs, and thereby weakened the competitiveness of the country. Highway transportation sector is more vulnerable to energy consumption comparing with railway sector since the highway sector is dependent mostly on fossil fuels for its energy source. In 2006 annual road cogestion costs in Korea reached 24.6 trillion won, with an average annual growth rate of 5.4%. The annual road congestion cost of intercity highways were 9.2 trillion won. As the new cities that recently developed are located far from Seoul area, the boundary of commuting in Seoul metropolitan area is extended. It makes passengers have longer trips with longer travel time, and the congestion problem to be more serious. In this regards, Gyeonggi Provincial Government proposed a deeper underground metropolitan express train system for the greater Metropolitan area. which is named as GTX. Gyeonggi Province suggested 3 key underground lines, based on the outcome of the feasibility study conducted by the Korea Society of Transportation, and submitted to the Ministry of Land Transportation and Maritime Affairs for its review. If the project is approved for construction and completed in 2016, the daily volume of surface traffic bound for Seoul will be reduced substantially and therefore the users will be benefitted for time savings by an annual amount of 2 trilion won every year.

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A Continuous Network Design Model for Target-Oriented Transport Mode Choice Problem (목표지향 교통수단선택을 위한 연속형 교통망설계모형)

  • Im, Yong-Taek
    • Journal of Korean Society of Transportation
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    • v.27 no.6
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    • pp.157-166
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    • 2009
  • A network design problem (NDP) is to find a design parameter to optimize the performance of transportation system. This paper presents a modified NDP, called target-oriented NDP, which contains a target that we try to arrive in real world, and also proposes a solution algorithm. Unlike general NDP which seeks an optimal value to minimize or to maximize objective function of the system, in target-oriented NDP traffic manager or operator can set a target level prior and then try to find an optimal design variable to attain this goal. A simple example for mode choice problem is given to test the model.