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Fine logarithmic adaptive soft morphological algorithm for synthetic aperture radar image segmentation
, Article IET Image Processing ; Volume 8, Issue 2 , 2014 , Pages 90-102 ; ISSN: 17519659 ; Hajsadeghi, K ; Koosha, M ; Sharif University of Technology
2014
Abstract
Synthetic aperture radar (SAR) appropriate image processing in conjunction with noise reduction is crucial in proper image segmentation. The authors present a new algorithm, logarithmic adaptive soft morphological (LASM) filter, utilising collectivity and flexibility of order-statistic soft morphological filters. This method not only reduces the speckle noise of the single-look SAR imagery considerably, but it significantly enhances the segmentation results. To verify the performance, a simulated SAR image is first created by applying an imagery method to an original noiseless image. The resulting image has characteristics identical to a real SAR image. The LASM method, as well as several...
Behavior of Angle-Shape Shear Connectors With Different Tilted Angles in Steel-Concrete Composite Systems
,
M.Sc. Thesis
Sharif University of Technology
;
Maleki, Shervin
(Supervisor)
Abstract
According to recent researches, angle-shape shear connectors are appropriate to transfer longitudinal shear forces across the steel-concrete interface. This study investigates the effect of tilted angle on capacity and behavior of angle-shape shear connectors. In this study, we consider two different tilted angles. Push-out tests consisting of eight specimens made of reinforced concrete and different angle-shapes were conducted. Specimens have tilted anglesof 112.5 and 135 degrees between the angle leg and steel beam. Two different failure modes were observed consisting of concrete crushing-splitting and angle fracture. In addition, a nonlinear finite element model of these push-out...
Speckle Noise Reduction Using Adaptive Filters with Application to SAR Images
, M.Sc. Thesis Sharif University of Technology ; Hajsadeghi, Khosrow (Supervisor)
Abstract
SAR image noise is a significant problem for SAR image analysis.The inherent noise of SAR images, known as speckle, seriously affects the SAR image interpretation. It also has adverse effects on the classification and segmentation of SAR images. Due to its great significance, the SAR image processing has received considerable attention in recent years and many researchers have developed techniques to reduce the inherent noise accompanying the SAR images. A survey of the literature shows that the wavelet analysis is one of the most common methods used for speckle reduction. While the power of the morphological analysis method has mostly not been recognized, we have utilized this efficient...
Behavior of tilted angle shear connectors
, Article PLoS ONE ; Volume 10, Issue 12 , December , 2015 ; 19326203 (ISSN) ; Maleki, S ; Shariati, M ; Ramli Sulong, N. H ; Sharif University of Technology
Public Library of Science
2015
Abstract
According to recent researches, angle shear connectors are appropriate to transfer longitudinal shear forces across the steel-concrete interface. Angle steel profile has been used in different positions as L-shaped or C-shaped shear connectors. The application of angle shear connectors in tilted positions is of interest in this study. This study investigates the behaviour of tilted-shaped angle shear connectors under monotonic loading using experimental push out tests. Eight push-out specimens are tested to investigate the effects of different angle parameters on the ultimate load capacity of connectors. Two different tilted angles of 112.5 and 135 degrees between the angle leg and steel...
Numerical analysis of tilted angle shear connectors in steel-concrete composite systems
, Article Steel and Composite Structures ; Volume 23, Issue 1 , 2017 , Pages 67-85 ; 12299367 (ISSN) ; Maleki, S ; Shariati, M ; Jalali, A ; Tahir, M. M ; Sharif University of Technology
Techno Press
2017
Abstract
This study investigates numerically the behavior of tilted angle shear connectors embedded in solid concrete slabs. Two different tilted angle connectors were used, titled angle with 112.5 and 135 degrees between the angle leg and steel beam flange. A nonlinear finite element model was developed to simulate and validate the experimental push-out tests. Parametric studies were performed to investigate the variations in concrete strength and connector's dimensions. The results indicate that the ultimate strength of a tilted angle shear connector is directly related to the square root of the concrete compressive strength. The effects of variations in the geometry of tilted angle connectors on...