Sharif Digital Repository

Variations in supply and demand of transportation, as well as those in the related environment, would cause daily variations in user travel time of transportation networks. This phenomenon particularly happen in morning travel time peaks, and make estimation of travel time highly unreliable. Morning peak passengers, whose timely presence at the destinations are highly important to them, prefer to choose paths that have minimum travel time and maximum reliability. Thus, the look at travel time pessimistically, and based on their experience, they put a margin of reliability to reach at timely at their destinations.
This study analysis such reliability margins based on the standard... 

With the growth and success of applications like Uber using the sharing economy concept in order to create value, many firms try to run businesses with similar ideas. Assisting such businesses to be created and grew, we present an analysis of Uber’s operation in this thesis. In addition, factors affecting supply and demand function for travel-matching applications are perceived with Tap30’s dataset and the mismatch between these functions in some areas and times is recognized as Tap30’s current problem. To address this problem, a mechanism is designed to adjust supply function with the demand in order to increase the number of customer-driver matching in the system. To design a mechanism, a... 

Urban mobility platforms introduced as an innovation in matching suppliers and demanders to each other in the transportation market in recent years. In this research, we applying synthetic control method to analyze the impact of this kind of platforms on labor market variables like work hours, income and number of employed persons in affected activity group. We use the ISIC correspondence tables for versions 3.1 and 4 and also Iran labor force survey and household survey to making activity control groups. The results show that work hours for main work in the related group were reduced. As well as the number of employees in the group increased 100 thousand people and the number of earners... 

Scheduling urban railway network is one of the most important parts of managing the rail transportation system. Therefore, researchers are trying to provide suitable solutions to produce an optimal timetable for the railway network. The purpose of this study is to provide a mathematical planning model to create a synchronized and optimal timetable for different lines of the railway network, including arrival time to each station and departure time from each station to reduce Travel time, waiting time at the origin station and transfer waiting time at the transfer station for passengers and maximize the number of passengers who successfully reach their destination in a specific study horizon.... 

Urban transportation infrastructure due to the emergency forces' access during and after the earthquake is one of the most important arteries in the face of crisis. The resilience of this infrastructure is a crucial factor that should control before an event, such as an earthquake, to prioritize segments for improving their conditions and prevent system disruption. In this research, a model presents for evaluating urban roads' resilience based on four characteristics of robustness, redundancy, resourcefulness, and rapidity. The fuzzy inference is employed to construct the model. Due to the expert opinion dependence of these models, the AHP questionnaire is used to train the model. In this... 

Trip distribution is the second step of the four-step travel demand modeling. Like other travel demand models, the most important objective of trip distribution models generation is forecasting the travel data of a year in the future. On the one hand, extensive changes in cities’ urban structures and people’s travel behavior during the years brings up the essential question of how temporally stable and transferable trip distribution models are? This question becomes even more important when the more complex structure of trip distribution models compared to models such as trip generation is considered. On the other hand, it is logical to assume that the consideration of the effects of urban... 

This thesis addresses the problem of configuration selection for an urban air mobility EVTOL aircraft utilizing a robust controller approach.First of all, to arrive at a final configuration, different feasible concepts for an urban transportation EVTOL aircraft have been proposed and studied during several brainstorming sessions. As a result, five potentially viable configurations have been selected for further investigation and analysis. These preliminary designs have been nominated utilizing the method of decision matrices and considering the design team and control system designer’s selection criteria. Finally, a tilt-rotor tandem-wing configuration has been selected to go through the... 

Urban transportation is one of the key parameters and indicators that determine the sustainable development of the city, in other words, to understand and evaluate the sustainability of a city, its transportation system must be considered. Bicycles can be considered the most sustainable means of urban transportation not only for short trips but also for medium trips.Urban bike networks in major cities are being systematically serviced and, like any other system to manage this volume of events, are facing challenges that we aim to improve one of the major costs of this system. The biggest challenge we face on this network is the imbalance between Inbound and outbound bicycles at different... 

The transportation sector plays a critical role in three key dimensions: economy, environment, and energy, necessitating integrated planning approaches. This study introduces an innovative approach to simultaneously addressing economic, environmental, and energy aspects by optimizing urban transportation systems. The focus is particularly on passenger cars, which significantly contribute to environmental pollutants such as particulate matter (PM) and energy consumption. The innovation of this research lies in developing an integrated model using linear optimization methods. This model identifies the optimal mix of fuel portfolios and transportation technologies from an economic perspective,... 

This work investigates the characteristics of a typical Urban Air-taxi Network (UrAN) in terms of critical parameters, such as aircraft speed and capacity. With the help of a Multi-agent virtual environment (in this case, “Net-Logo”), we were able to show the relationship among key parameters affecting passenger displacement capacity in a simple network with two stations. The critical parameters include the aircraft (EVTOL) speed and its passenger capacity, together with the available number of take-off and landing pads at each station as well as the distance between the two immediate stations.The results of 400 simulations show that the capacity of passenger displacement in a simple UrAN... 

This thesis examines the accessibility gap between different modes of transportation in Tehran Province, with a particular focus on public transportation and cycling. The main objective of this research is to calculate and analyze accessibility indicators to various land uses (such as commercial, service, and recreational) around metro stations using two modes of travel: cycling and bus-walking. The study utilizes simulations in Python and geographic libraries to compare these two modes of travel based on four key accessibility indicators: 1) nearest Opportunity, 2) cumulative opportunity, 3) average distance, and 4) gravity-based accessibility to measure the accessibility gap between the...