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ebrahimkhanlou--arvin
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Identification and Assessment of Nomadic Transportation and Analysis of its Supply and Demand for Mainly Farmer Nomads-case Study: Isfahan Qashqaees
, M.Sc. Thesis Sharif University of Technology ; Vaziri, Manouchehr (Supervisor)
Abstract
Growth of cities leads to neglecting of travel behavior of nomads, although they are an important portion of Iran’s population. The aim of this study is recognition and studying transportation demand in a nomadic society that their households are mostly farmer. Firstly, the theory of activity-based modeling was studied. Sequential modeling was chosen for modeling which consider daily activities of each person as a result of five sequential decisions: a) Choosing daily activity pattern; b) Choosing primary tour time; c) Choosing primary tour mode choice; d) Choosing secondary tour time; e) Choosing secondary tour mode choice. In order to collect pertinent information and conduct survey,...
Seismic Behavior of Curved (Sinusoidal) Shear Wall
, M.Sc. Thesis Sharif University of Technology ; Khaloo, Alireza (Supervisor)
Abstract
So far many systems have been proposed to withstand the lateral loads. For example in a concrete structure, the two concrete moment frame and moment frame with shear wall are commonly used.in the latter case, the shear walls are used to bear a large part of lateral forces.one of the disadvantages of this system is the high consumption of materials and lack of maneuver on their shape. The curved concrete shear wall is a new seismic system that, due to the curvature on the plan, will have the ability to provide the hardness, strength, and ductility required to withstand lateral loads. The goal of this project is to investigate the seismic performance of these types of walls against cyclic...
Performance Based Seismic Assessment of Concrete Dual Structures using Endurance Time Method
, M.Sc. Thesis Sharif University of Technology ; Esmaeil Pourestekanchi, Homayun (Supervisor)
Abstract
The expansion of new analytical methods along with evolving computational tools has accelerated the recognition of obscured nonlinear behavior of structures. In this process, the innovative Endurance Time method is a great step which presents a comprehensive assessment of structural behavior with less computational cost. The accuracy of this method among the unpredictable nature of earthquake engineering, as well as its fastness and simplicity, has attracted the attention of researchers. This research is part of a project on introducing and assessing the capacities and restrictions of the Endurance Time method, which investigates its usage in analyzing performance of concrete structures with...
Spatial analysis of damage evolution in cyclic-loaded reinforced concrete shear walls
, Article Journal of Building Engineering ; Volume 49 , 2022 ; 23527102 (ISSN) ; Dolatshahi, K. M ; Ebrahimkhanlou, A ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
This paper introduces a probabilistic framework to quantify the spatial distribution of cracking and crushing in rectangular reinforced concrete shear walls at different drift ratios. In this research, a comprehensive probabilistic spatial analysis is conducted on an extensive collected database of reinforced concrete shear walls tested under the quasi-static cyclic loading. The database includes 235 images of 72 damaged walls with various geometry and material properties at different drift ratios between 0.0 and 4.0%. Various image processing filters are implemented to the images to highlight the wall areas that are more prone to cracking and crushing. Then, advanced statistical analysis is...
Study on mobile phone use while driving in a sample of Iranian drivers
, Article International Journal of Injury Control and Safety Promotion ; 2016 , Pages 1-7 ; 17457300 (ISSN) ; Khademi, M ; Razi Ardakani, H ; Sharif University of Technology
Taylor and Francis Ltd
2016
Abstract
The use of cell phone is a significant source of driver distraction. Phone use while driving can impair a number of factors critical for safe driving which can cause serious traffic safety problems. The objective of this paper was to investigate the frequency of using cell phones while driving in Iran's roads through an observational survey with a random sample of drivers, to recognize contributing factors to cell phone usage and to understand the magnitude of the problem. A total of 1794 observations were collected from 12 sites at controlled intersections, entrance and exit points of highways. The cell phone use rate among drivers (talking or texting) was estimated at 10% which is...
Study on mobile phone use while driving in a sample of Iranian drivers
, Article International Journal of Injury Control and Safety Promotion ; Volume 24, Issue 2 , 2017 , Pages 256-262 ; 17457300 (ISSN) ; Khademi, M ; Razi Ardakani, H ; Sharif University of Technology
Taylor and Francis Ltd
2017
Abstract
The use of cell phone is a significant source of driver distraction. Phone use while driving can impair a number of factors critical for safe driving which can cause serious traffic safety problems. The objective of this paper was to investigate the frequency of using cell phones while driving in Iran's roads through an observational survey with a random sample of drivers, to recognize contributing factors to cell phone usage and to understand the magnitude of the problem. A total of 1794 observations were collected from 12 sites at controlled intersections, entrance and exit points of highways. The cell phone use rate among drivers (talking or texting) was estimated at 10% which is...
High-dimensional data analytics for sparse recovery of guided-waves dispersion curves using b-splines
, Article Structural Health Monitoring 2023: Designing SHM for Sustainability, Maintainability, and Reliability - Proceedings of the 14th International Workshop on Structural Health Monitoring ; 2023 , Pages 796-803 ; 978-160595693-0 (ISBN) ; Jeddi, M ; Ebrahimkhanlou, A ; Farhangdoust S ; Guemes A ; Chang F. K ; Sharif University of Technology
DEStech Publications
2023
Abstract
This research presents a technique to recover the dispersion curves of guided-waves by utilizing the inherent sparsity of these signals in the frequency-wavenumber domain. The proposed methodology is a data-driven approach that combines physics-based knowledge with high-dimensional analysis to obtain the dispersion curves of the medium from experimental signals. Initially, a sparse two-dimensional dispersion matrix is constructed using sparse wavenumber analysis. Then, B-splines are fitted to non-zero elements of this matrix to establish an initial estimate of the dispersion curve parameters. These parameters are further optimized using the quasi-Newton algorithm to improve the accuracy of...
Extended artificial pheromone system for swarm robotic applications
, Article Proceedings of the 2019 Conference on Artificial Life: How Can Artificial Life Help Solve Societal Challenges, ALIFE 2019, 29 July 2019 through 2 August 2019 ; 2020 , Pages 608-615 ; Raoufi, M ; Emre Turgut, A ; Krajnik, T ; Arvin, F ; Sharif University of Technology
MIT Press
2020
Abstract
This paper proposes an artificial pheromone communication system inspired by social insects. The proposed model is an extension of the previously developed pheromone communication system, COS-Φ. The new model increases COS-Φ flexibility by adding two new features, namely, diffusion and advection. The proposed system consists of an LCD flat screen that is placed horizontally, overhead digital camera to track mobile robots, which move on the screen, and a computer, which simulates the pheromone behaviour and visualises its spatial distribution on the LCD. To investigate the feasibility of the proposed pheromone system, real micro-robots, Colias, were deployed which mimicked insects' role in...
Design, construction, and installation of movable electrode biasing system on tokamak
, Article Journal of Fusion Energy ; Volume 29, Issue 5 , 2010 , Pages 467-470 ; 01640313 (ISSN) ; Salar Elahi, A ; Tajdidzadeh, M ; Mohammadi, S ; Arvin, R ; Gheydi, M ; Abbaspour Tehrani Fard, A ; Sharif University of Technology
Springer New York LLC
2010
Abstract
The first results of the movable electrode biasing experiments performed on the IR-T1 tokamak are presented. For this purpose, a movable electrode biasing system was designed, constructed, and installed on the IR-T1 tokamak, and then the positive voltage applied to an electrode inserted inside the tokamak limiter and the plasma current, poloidal and radial components of the magnetic fields, loop voltage, and diamagnetic flux in the absence and presence of the biased electrode were measured. Results compared and discussed