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conformal-mapping
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Elastic Fields of a Confocal Elliptic Ring at the States of Plane Strain and Plane Stress
, M.Sc. Thesis Sharif University of Technology ; Mohammadi Shodja, Hossein (Supervisor)
Abstract
In this thesis an analytical solution is introduced for finding the elastic fields of stress and strain in a confocal elliptic ring at the state of general plane problem. A confocal elliptic ring is a doubly connected region which its external and internal boundaries are ellipses with the same focal points. We used the method of complex variables, the functions of Kolosov-Muskhelishvili potentials, Laurent series expansion for analytical functions, the method of the analytic continuation of Milne-Thomson, elliptic hyperbolic coordinates, and two dimensional conformal mapping to do this study. the importance of this analysis is because we can simulate some problems of the elasticity by...
Hierarchical set-associate cache for high-performance and low-energy architecture
, Article Journal of Circuits, Systems and Computers ; Volume 15, Issue 6 , 2006 , Pages 861-880 ; 02181266 (ISSN) ; Miremadi, G ; Sharif University of Technology
2006
Abstract
This paper presents a new cache scheme based on varying the size of sets in the set-associative cache hierarchically. In this scheme, all sets at a hierarchical level have same size but are fc times more than the size of sets in the next level of hierarchy where k is called division factor. Therefore the size of tag fields associated to each set is variable and it depends on the hierarchy level of the set it is in. This scheme is proposed to achieve higher hit ratios with respect to the two conventional schemes namely set-associative and direct mapping. The proposed scheme has been simulated with several standard trace files SPEC 2000 and statistics are gathered and analyzed for different...
Sandpile Model on Height Parameters
, M.Sc. Thesis Sharif University of Technology ; Moghimi Araghi, Saman (Supervisor)
Abstract
Many statistical systems such as earthquakes, road trafcs, forest fres, neurocortical avalanches etc. exhibit self-organized criticality (SOC). In such systems without tuning extrenal parameters, the system arrives at criticality. During recent decades, a number of models are introduced which show the same charactristics. These models have made a platform to investigate the physics of self-organized criticality. Among them, sandpile models are the best known models. They exhibit critical behaviour such as scaling laws. Also in some of them conformal invariance is checked nummerically.Most of sandpile models deal with slope parameters, that is, the main dynamical parameters are the local...
Application specific router architectures for NoCs: An efficiency and power consumption analysis
, Article Mechatronics ; Vol. 22, issue. 5 , August , 2012 , pp. 531-537 ; ISSN: 9574158 ; Sarbazi-Azad, H ; Sharif University of Technology
Abstract
Networks on chip (NoC) have been proposed as a solution to mitigate complex on-chip communication problems. NoCs are composed of intellectual properties (IP) which are interconnected by on-chip switching fabrics. A step in the design process of NoCs is hardware virtualization which is mapping the IP cores onto the tiles of a chip. The communication among the IP cores greatly affects the performance and power consumption of NoCs which itself is deeply related to the placement of IPs onto the tiles of the network. Different mapping algorithms have been proposed for NoCs which allocate a set of IPs to given network topologies. In these mapping algorithms, there is a restriction which limits IPs...
Deriving relativistic Bohmian quantum potential using variational method and conformal transformations
, Article Pramana - Journal of Physics ; Volume 86, Issue 4 , 2016 , Pages 747-761 ; 03044289 (ISSN) ; Golshani, M ; Sarbishei, M ; Sharif University of Technology
Abstract
In this paper we shall argue that conformal transformations give some new aspects to a metric and changes the physics that arises from the classical metric. It is equivalent to adding a new potential to relativistic Hamilton-Jacobi equation. We start by using conformal transformations on a metric and obtain modified geodesics. Then, we try to show that extra terms in the modified geodesics are indications of a background force. We obtain this potential by using variational method. Then, we see that this background potential is the same as the Bohmian non-local quantum potential. This approach gives a method stronger than Bohm's original method in deriving Bohmian quantum potential. We do not...
Direct evidence for conformal invariance of avalanche frontiers in sandpile models
, Article Physical Review E - Statistical, Nonlinear, and Soft Matter Physics ; Volume 79, Issue 3 , Volume 79, Issue 3 , 2009 ; 15393755 (ISSN) ; Moghimi-Araghi, S ; Dashti-Naserabadi, H ; Rouhani, S ; Sharif University of Technology
2009
Abstract
Appreciation of stochastic Loewner evolution (SLEκ), as a powerful tool to check for conformal invariant properties of geometrical features of critical systems has been rising. In this paper we use this method to check conformal invariance in sandpile models. Avalanche frontiers in Abelian sandpile model are numerically shown to be conformally invariant and can be described by SLE with diffusivity κ=2. This value is the same as value obtained for loop-erased random walks. The fractal dimension and Schramm's formula for left passage probability also suggest the same result. We also check the same properties for Zhang's sandpile model. © 2009 The American Physical Society
Using geometry modeling to find pose invariant features in face recognition
, Article 2007 International Conference on Intelligent and Advanced Systems, ICIAS 2007, Kuala Lumpur, 25 November 2007 through 28 November 2007 ; 2007 , Pages 577-581 ; 1424413559 (ISBN); 9781424413553 (ISBN) ; Safayani, M ; Manzuri Shalmani, M. T ; Sharif University of Technology
2007
Abstract
Face recognition has been an important topic in computer vision for the last two decades. While many algorithms have been developed to address this issue, one of the major challenges faced by them is variation in pose. One of the possible solutions is to find invariant features among different poses of a single person. In this paper a geometry mapping between a frontal face and its rotated pose is used to find invariant features for pose robust face recognition. This mapping is solely based on the angle of rotation and indicates mutual regions between a frontal view of a person and its rotated image. Invariant features based on the low frequency coefficients of these mutual regions are then...
The superconvergence patch recovery technique and data transfer operators in 3D plasticity problems
, Article Finite Elements in Analysis and Design ; Volume 43, Issue 8 , 2007 , Pages 630-648 ; 0168874X (ISSN) ; Gharehbaghi, S. A ; Sharif University of Technology
2007
Abstract
A decade has passed since the first appearance of the superconvergent patch recovery (SPR) method introduced by Zienkiewicz and Zhu [The superconvergence patch recovery and a posteriori error estimates, part I: the recovery techniques, Int. J. Numer. Methods Eng. 33 (1992) 1331-1364; The superconvergence patch recovery and a posteriori error estimates, part II: error estimates and adaptivity, Int. J. Numer. Methods Eng. 33 (1992) 1365-1380; Superconvergence and the superconvergent patch recovery, Finite Elem. Anal. Des. 19 (1995) 11-23]. The method is now widely used in engineering practices for its robustness and efficiency in computer implementation. This paper presents an extension of the...
FTSPM: A fault-tolerant scratchpad memory
, Article Proceedings of the International Conference on Dependable Systems and Networks ; 2013 , Page(s): 1 - 10 ; 9781467364713 (ISBN) ; Farbeh, H ; Miremadi, S. G ; Fazeli, M ; Asadi, H ; Sharif University of Technology
2013
Abstract
Scratch Pad Memory (SPM) is an important part of most modern embedded processors. The use of embedded processors in safety-critical applications implies including fault tolerance in the design of SPM. This paper proposes a method, called FTSPM, which integrates a multi-priority mapping algorithm with a hybrid SPM structure. The proposed structure divides SPM into three parts: 1) a part is equipped with Non-Volatile Memory (NVM) which is immune against soft errors, 2) a part is equipped with Error-Correcting Code, and 3) a part is equipped with parity. The proposed mapping algorithm is responsible to distribute the program blocks among the above three parts with regards to their vulnerability...
Application specific router architectures for NoCs: An efficiency and power consumption analysis
, Article Mechatronics ; Volume 22, Issue 5 , 2012 , Pages 531-537 ; 09574158 (ISSN) ; Sarbazi Azad, H ; Sharif University of Technology
Elsevier
2012
Abstract
Networks on chip (NoC) have been proposed as a solution to mitigate complex on-chip communication problems. NoCs are composed of intellectual properties (IP) which are interconnected by on-chip switching fabrics. A step in the design process of NoCs is hardware virtualization which is mapping the IP cores onto the tiles of a chip. The communication among the IP cores greatly affects the performance and power consumption of NoCs which itself is deeply related to the placement of IPs onto the tiles of the network. Different mapping algorithms have been proposed for NoCs which allocate a set of IPs to given network topologies. In these mapping algorithms, there is a restriction which limits IPs...
An efficient PD data mining method for power transformer defect models using SOM technique
, Article International Journal of Electrical Power and Energy Systems ; Volume 71 , October , 2015 , Pages 373-382 ; 01420615 (ISSN) ; Vakilian, M ; Blackburn, T. R ; Phung, B. T ; Sharif University of Technology
Elsevier Ltd
2015
Abstract
Suggestion and application of a set of new features for on-line Partial Discharge (PD) monitoring, where there is no information about the type of PD is a challenging task for condition assessment of power equipments, such as a power transformer. This is looked for in this paper. So far, in past various techniques have been employed to develop a comprehensive PD monitoring system, however limited success has been achieved. One of the challenging issues in this field is the discovering of proper features capable of differentiating the involvement of possible types of PD sources. In order to examine the efficiency of the method established in this paper, which is based on application of a set...
Torsion of an eccentrically two-phase circular nanobar
, Article 2010 IEEE 5th International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2010, 20 January 2010 through 23 January 2010 ; January , 2010 , Pages 70-73 ; 9781424465439 (ISBN) ; Shodja, H. M ; Sharif University of Technology
2010
Abstract
The effect of surface and interface elasticity in analysis of the Saint-Venant torsion problem of an eccentrically two-phase circular nanobar is considered. The problem is formulated in the context of Gurtin's surface elasticity. For a rigorous solution of the proposed problem, conformal mapping together with a Laurent series expansion are employed. At the nanoscales the usual classical theories cease to hold and the corresponding results deteriorate. The numerical results well illustrate that the torsional rigidity of the mentioned nanosized structural elements are significantly affected by the size. Some applications of the given results can be contemplated in the design of micro/nano...
Application specific router architectures for NoCs: An efficiency and power consumption analysis
, Article Proceedings - 2010 First Workshop on Hardware and Software Implementation and Control of Distributed MEMS, dMEMS 2010, 28 June 2010 through 29 June 2010, Besancon ; 2010 , Pages 86-91 ; 9780769540641 (ISBN) ; Sarbazi Azad, H ; Sharif University of Technology
2010
Abstract
Networks on Chip1 have been proposed as a solution to mitigate complex on-chip communication problems. NoCs are composed of intellectual properties 2 which are interconnected by on-chip switching fabrics. A step in the design process of NoCs is hardware virtualization which is mapping the IP cores on to the tiles of a chip. The communication among the IP cores greatly affects the performance and power consumption of NoCs which itself is deeply related to the placement of IPs on to the tiles of the network. Different mapping algorithms have been proposed for NoCs which allocate a set of IPs to given network topologies. In these mapping algorithms, there is a restriction which limits IPs to be...
Validity of cauchy-born hypothesis in multi-scale modeling of plastic deformations
, Article International Journal of Solids and Structures ; 2017 ; 00207683 (ISSN) ; Jahanshahi, M ; Toloui, G ; Sharif University of Technology
Elsevier Ltd
2017
Abstract
The Cauchy-Born (CB) hypothesis has been widely used in multi-scale modeling of crystalline nano-structures. The violation of CB hypothesis in stress space and the transition to plasticity, which is equivalent to the violation of CB hypothesis in strain space, are generally confused and it becomes crucial to differentiate between the two distinct phenomena; the violation of the former usually occurs at high values of stress and at regions where the surface effects are manifest while the violation of the latter occurs at low stresses when the material loses its strength to tolerate the applied loading. In this paper, a novel technique is developed to investigate the validity of CB hypothesis...
Nonlinear Dimensionality Reduction via Path-Based Isometric Mapping
, Article IEEE Transactions on Pattern Analysis and Machine Intelligence ; Volume 38, Issue 7 , 2016 , Pages 1452-1464 ; 01628828 (ISSN) ; Joudaki, A ; Fatemizadeh, E ; Sharif University of Technology
IEEE Computer Society
Abstract
Nonlinear dimensionality reduction methods have demonstrated top-notch performance in many pattern recognition and image classification tasks. Despite their popularity, they suffer from highly expensive time and memory requirements, which render them inapplicable to large-scale datasets. To leverage such cases we propose a new method called "Path-Based Isomap". Similar to Isomap, we exploit geodesic paths to find the low-dimensional embedding. However, instead of preserving pairwise geodesic distances, the low-dimensional embedding is computed via a path-mapping algorithm. Due to the much fewer number of paths compared to number of data points, a significant improvement in time and memory...
Validity of cauchy–born hypothesis in multi-scale modeling of plastic deformations
, Article International Journal of Solids and Structures ; Volume 115-116 , 2017 , Pages 224-247 ; 00207683 (ISSN) ; Jahanshahi, M ; Toloui, G ; Sharif University of Technology
Elsevier Ltd
2017
Abstract
The Cauchy–Born (CB) hypothesis has been widely used in multi-scale modeling of crystalline nano-structures. The violation of CB hypothesis in stress space and the transition to plasticity, which is equivalent to the violation of CB hypothesis in strain space, are generally confused and it becomes crucial to differentiate between the two distinct phenomena; the violation of the former usually occurs at high values of stress and at regions where the surface effects are manifest while the violation of the latter occurs at low stresses when the material loses its strength to tolerate the applied loading. In this paper, a novel technique is developed to investigate the validity of CB hypothesis...
Interaction of a screw dislocation and an embedded nonuniformly coated circular fiber with imperfect interfaces
, Article International Journal of Solids and Structures ; Volume 182-183 , 2020 , Pages 295-306 ; Shodja, H. M ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
The eccentricity between the circular fiber and its coating as well as the imperfection at the fiber-coating-matrix interfaces associated with certain composites can have a remarkable effect on the movement of a dislocation. For an in-depth understanding of such phenomena, the present work provides an exact analytical solution for the interaction between an eccentrically coated circular inhomogeneity embedded in an infinite elastic medium with imperfect interfaces and a screw dislocation. The dislocation may be located inside one of the regions: the core inhomogeneity, coating, or the matrix. The corresponding boundary value problem is solved by using conformal mapping and complex potential...
A novel GA-based High-Level Synthesis technique to enhance RT-level concurrent testing
, Article 14th IEEE International On-Line Testing Symposium, IOLTS 2008, Rhodes, 7 July 2008 through 9 July 2008 ; 2008 , Pages 173-174 ; 9780769532646 (ISBN) ; Aminzadeh, S ; Safari, S ; Navabi, Z ; Sharif University of Technology
2008
Abstract
This paper presents an efficient High-Level Synthesis (HLS) approach to improve RT-Level concurrent testing. The proposed method used for both fault detection and fault location. At first the available resources are used in their dead intervals to test active resources for fault detection, and then some changes are applied to the RT-Level controller to locate the faults. The fault detection step is based on a genetic algorithm (GA) search technique. This genetic algorithm is applied to the design after high level synthesis process to explore the test map. The proposed method has been evaluated based on dependability enhancement and area/latency overhead imposed to different benchmarks after...
PERMAP: A performance-aware mapping for application-specific SoCs
, Article ASAP08 - IEEE 19th International Conference on Application-Specific Systems, Architectures and Processors, Leuven, 2 July 2008 through 4 July 2008 ; 2008 , Pages 73-78 ; 10636862 (ISSN) ; 9781424418985 (ISBN) ; Hessabi, S ; Sarbazi Azad, H ; Sharif University of Technology
2008
Abstract
Future System-on-Chip (SoC) designs will need efficient on-chip communication architectures that can provide efficient and scalable data transport among the Intellectual Properties (IPs). Designing and optimizing SoCs is an increasingly difficult task due to the size and complexity of the SoC design space, high cost of detailed simulation, and several constraints that the design must satisfy. For efficient design of SoCs, an efficient mapping of IPs onto Networks-on-Chip (NoCs) is highly desirable. Towards this end, we have presented PERMAP, a PERformance-aware MAPping algorithm which maps the IPs onto a generic NoC architecture such that the average communication delay is minimized. This is...
Earthquake vulnerability assessment for urban areas using an ann and hybrid swot-qspm model
, Article Remote Sensing ; Volume 13, Issue 22 , 2021 ; 20724292 (ISSN) ; Zabihi, H ; Rezaie, F ; Asadzadeh, A ; Wolf, I. D ; Langat, P. K ; Khosravi, I ; Beiranvand Pour, A ; Mohammad Nataj, M ; Pradhan, B ; Sharif University of Technology
MDPI
2021
Abstract
Tabriz city in NW Iran is a seismic-prone province with recurring devastating earthquakes that have resulted in heavy casualties and damages. This research developed a new computational framework to investigate four main dimensions of vulnerability (environmental, social, economic and physical). An Artificial Neural Network (ANN) Model and a SWOT-Quantitative Strategic Planning Matrix (QSPM) were applied. Firstly, a literature review was performed to explore indicators with significant impact on aforementioned dimensions of vulnerability to earthquakes. Next, the twenty identified indicators were analyzed in ArcGIS, a geographic information system (GIS) software, to map earthquake...