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- 저자 : Avishai Ceder (검색결과 4 건)
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Avishai Ceder,Stephan Hassold,Christopher Dunlop,Iris Chen 서울시립대학교 도시과학연구원 2013 도시과학국제저널 Vol.17 No.2
This paper deals with the creation of bus timetables using different vehicle sizes. The need for the development of new bus timetables for public transport (PT) stems from the current reliability and efficiency problems that current bus services are facing. These issues arise from the fact that timetables are designed mainly with even headways; however, it is also possible to design timetables with even passenger loads on the vehicles at the maximum load points, but with uneven headways. This paper hopes to bridge the two strategies together through the use of the incorporation of a mixed fleet size, running in conjunction. The timetables were constructed using two key concepts; assigning capacity and shifting departure times. The methodology for the creation of timetables was applied to a real-life example from Auckland, New Zealand. The results of the timetable are promising, validating the methodology of the model. The new timetables lead to a reduction in both passenger waiting time (user perspective) and empty seat time (operator perspective), with only a marginal increase in passenger standee time. The implementation of a mixed fleet of different vehicle sizes shows to be a promising way for achieving both an even headway and an even loading.
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Urban mobility and public transport: future perspectives and review
Avishai (Avi) Ceder 서울시립대학교 도시과학연구원 2021 도시과학국제저널 Vol.25 No.4
The purpose of this work is to review urban transportation likely to be offered in the future. Trip-making behaviour has already changed considerably as lifestyles change and they will continue to change in the future. This work reflects and places emphasis on profound thinking about the possibilities, rather than predicting them. Thoughts about possibilities for the future draw upon imagination, perceived and justified feasibility, and lessons gained from the past. This work attempts to capture the possibilities, logistics and travel modes of future urban transportation. A visionary, feasibility-related approach grounded in a realist perspective is proposed, only conceptually, to explore plausible visions for the future. In addition, this work shows the inefficiency of using private cars (PCs) and argues that in the development of autonomous and electric vehicles, PCs cannot provide a solution competitive with the potential that urban transportation systems have for the future. Hence, the solutions for the future must be based on public transport (PT) modes of travel, regardless of whether they are metro, bus, light rail, tram, ridesharing services, an ordinary taxi, personal rapid transit, or any other PT-based future mode. The key principal of operation for the mobility of a smart city will be the ability to optimize the connectivity of movement in order to approach a seamless move, while endowing the phrase door-to-door travel with new meaning. Finally, it would be remiss not to mention the unforeseeable implications of the Covid-19 pandemic for future mobility, more controllable by automation of non-privately owned vehicle, and with the prospect of people demonstrating a greater inclination towards changing their habits, behaviour, and thinking paradigms.
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Zhichao Cao,Ting Xu,Silin Zhang,Avishai (Avi) Ceder,Yuyao Sun 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.7
Even-headway timetables with easy to memorize departure times are commonly in use in public transport (PT) service. In addition, some PT services are using timetables where their departure times are based on even-passenger-load at the max-load stop along the route. In practice, these two types of timetables are implemented in daily operation plans, allowing for their merits, with the former maintaining the initial, even-interval departure rules and conventions, especially when a new PT line is planned without available demand information, while the latter is demand-oriented, exhibiting fluctuation in time and space. The principles of creating the aforementioned timetables have been presented in the literature, but very few evaluations feasibly attest to performance by means of mathematical analysis. Concentrating on building a modelling framework for PT timetabling problems during the planning stage, this work is taking into account 1) passengers’ service-frequency satisfaction, in terms of waiting times, 2) passengers’ perception of riding comfort, in terms of seat availability, and 3) planned passengers’ load ratio (concerning vehicle’s capacity) linked with operation efficiency. Yielding to the models developed in a theoretical manner, the comparative evaluation is conducted through multiple timetable schemes that include four different dimensions: (A) even-headway departures with same headway throughout the time horizon, (B) even-load departures with same load throughout the time horizon, (C) even-headway departures for each demand-dependent period, and (D) even-load departures for each demand-dependent period. Finally, a case study in Nantong, China examines the comparison performances produced and the best plans for operational timetables. The results indicate that travelers attributed great importance to higher satisfaction preferences on frequency or headway-related experience linked with their waiting time.
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