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Low-cost three-dimensional millimeter-wave holographic imaging system based on a frequency-scanning antenna
, Article Applied Optics ; Volume 57, Issue 1 , 2018 , Pages A65-A75 ; 1559128X (ISSN) ; Mansouri, E ; Kavehvash, Z ; Fakharzadeh, M ; Shabany, M ; Khavasi, A ; Sharif University of Technology
OSA - The Optical Society
2018
Abstract
In this paper, a closed-form two-dimensional reconstruction technique for hybrid frequency and mechanical scanning millimeter-wave (MMW) imaging systems is proposed. Although being commercially implemented in many imaging systems as a low-cost real-time solution, the results of frequency scanning systems have been reconstructed numerically or have been reported as the captured raw data with no clear details. Furthermore, this paper proposes a new framework to utilize the captured data of different frequencies for three-dimensional (3D) reconstruction based on novel proposed closed-form relations. The hybrid frequency and mechanical scanning structure, together with the proposed...
Simulation-optimization framework for train rescheduling in rapid rail transit
, Article Transportmetrica B ; 2020 ; Sajedinejad, A ; Kardannia, A ; Shakibayifar, M ; Jafari, H ; Mansouri, E ; Sharif University of Technology
Taylor and Francis Ltd
2020
Abstract
One of the primary challenges of re-planning in high-speed urban railways is the randomness of disruptive events. In this study, an integrated disturbance recovery model presented in which short-turn and stop-skip service operations are optimized together to minimize the average of passengers’ waiting times. This study develops a discrete-event simulation model that employs a variable neighborhood search algorithm to maintain the service level under infrastructure elements’ unavailability. Due to the unpredictable nature of the incidents, the uncertainty associated with obstruction duration is experimentally analyzed through probabilistic scenarios. The computational experiments are...
Simulation-optimization framework for train rescheduling in rapid rail transit
, Article Transportmetrica B ; Volume 9, Issue 1 , 2021 , Pages 343-375 ; 21680566 (ISSN) ; Sajedinejad, A ; Kardannia, A ; Shakibayifar, M ; Jafari, H ; Mansouri, E ; Sharif University of Technology
Taylor and Francis Ltd
2021
Abstract
One of the primary challenges of re-planning in high-speed urban railways is the randomness of disruptive events. In this study, an integrated disturbance recovery model presented in which short-turn and stop-skip service operations are optimized together to minimize the average of passengers’ waiting times. This study develops a discrete-event simulation model that employs a variable neighborhood search algorithm to maintain the service level under infrastructure elements’ unavailability. Due to the unpredictable nature of the incidents, the uncertainty associated with obstruction duration is experimentally analyzed through probabilistic scenarios. The computational experiments are...