Author Archives: Jia Xu

Dissertation Defense for Shadi Djavadian (Ryerson University): Fri, Aug 12, 2016

Ph.D. DEFENSE ANNOUCEMENT

Presented by: Shadi Djavadian

Doctor of Philosophy in Civil Engineering with an emphasis in Transportation Engineering

Supervisors: Dr. Bhagwant Persuad and Dr. Joseph Chow

Friday, August 12th, 2016 – MON 316: 11:00 am

Title:
Evaluation Methods of Dynamic Flexible Transportation Systems
Abstract:
demonstrates that even for a simple case the process for a single population can lead to perpetual oscillations. Nonetheless, multiple populations can be sampled to construct an invariant distribution of demand and welfare effects. The dynamic DARP evaluation successfully demonstrates that an operating policy can be integrated with the day-to-day adjustment process. Sensitivity tests from the Oakville and Manhattan experiments illustrate the effectiveness of the proposed process with respect to changes in system operating parameters and designs like fleet size, dynamic routing policy or single ride vs share-ride. We will further explore flexible transport services as two-sided markets, and extend our earlier agent-based day-to-day adjustment process to include day-to-day adjustment of the service operator(s) as a two-sided market. Computational experiments are conducted with a simple network. Findings confirm the existence of locally stable states, and of thresholds from which network externalities cause two-sided and one-sided market equilibria to diverge. We use the Ramsey pricing criterion for social optimum to show that perfectly matched states from our day-to-day process are equivalent to a social optimum. A case study using real data from Oakville, Ontario, as a first/last mile problem example demonstrates the sensitivity of the day-to-day model to operating policies.

Announcements

Urban SOS: Fair Share

This contest might be of interest.  The winning team will receive US $7,500 and up to US $25,000 of in-kind support from AECOM to bring their project to life in the real world in spring 2017.  Pre-registration, recommended not mandatory, is by Jun 14.  Entries are due Sept 2.

For more information: website