Sharif Digital Repository

Regardless of the traffic model and its application, an essential input of transportation models is the amount of demand which is usually described using Origin-Destination (O-D) matrix. Many reaserchers have developed different O-D matrix estimation methods using traffic counts, which allow simple data collection as opposed to the costly traditional direct estimation methods based on home and roadside interview. However, Link data is not sufficient to obtain an unique answer. This reaserch tries to estimate O-D matrix by using Automated Vehicle Identification(AVI) data. The research formulates the problem of the estimating O-D matrix as a bi-level problem. The upper level consists of... 

Mechanosensitive (MS) channels are ubiquitous molecular force sensors that respond to a number of different mechanical stimuli including tensile, compressive and shear stress. One of the main mechanisms to functionally study these channels is the patch clamp technique. Here we use continuum mechanics to probe the question of how curvature, in a standard patch clamp experiment, at different length scales (global and local) affects a model MS channel. Firstly, to increase the accuracy of the Laplace’s equation in tension estimation in a patch membrane and to be able to more precisely describe the transient phenomena happening during patch clamping, we propose a modified Laplace’s equation. In... 

One of the most important required data in order to consult transportation studies is the amount of trip demand between different zones in the study region. Trip demand is usually presented in form of a table. Due to dependence of the demand on time, it gets classified in two categories: Static and Time dependent. In Time dependent problems, which the scope of this research is, trip demand is affected by network condition and the amount of traffic supply in short periods of time, e.g. 15 minutes. Using Traffic count and prior trip demand table in order to estimate the time dependent Trip demand is among the newest methods of travel demand estimation. In this research despite of older studies... 

Increasing of public transit market share in urban transportation is one of the major policies of urban system improvement. Lessening emission and fuel consumption are outstanding achievements of designing and operating effective public transit systems. As rapid transit systems play a major role in urban transit network, feeder bus lines can play as their complementary role in the urban transit scene. Feeder bus network provide a better accessibility and coverage for passengers. In spite of its important role, feeder bus network design is studied in a small number of publications in transit network design. In this study, a mathematical program model is presented to state feeder bus network... 

Encouraging passengers in order to use public transportation facilities is one of the goals of transportation planners. The most effective way to increase the market share of public transportation is enhancing its Level of Service via faster and more comfortable transportation in comparison with private vehicles. Exploitation of rapid transportation lines (Subway, BRT, and etc.) is justifiable in corridors in which the demand exceeds a minimum value. While in most of metropolitans such demand may not be present inadvertently in any of corridors, generating the needed demand and increasing the accessibility to public transportation is possible using feeder lines like feeder buses. In fact,... 

Reliable forecasting is a fundamental element of successful project management. Construction managers regularly control and monitor their project in order to ensure that their project performance is under control and within the acceptable control limits. Conventionally, the earned value method (EVM) is used to monitor project cost performance. However, its application to schedule performance using schedule performance index (SPI) has been widely questioned both by practitioners and researchers particularly due to poor accuracy early in the project. This study presents a novel activity-based framework, namely Weibull Evaluation and Forecasting Method (WEFM), for stochastic evaluation and...