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farivar--saeedeh
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Comparing Meta-Heuristic Algorithms for Solving Transportation Network Design Problem
, M.Sc. Thesis Sharif University of Technology ; Zokaei Aashtiani, Hedayat (Supervisor)
Abstract
Discrete network design problem is selecting a set of feasible projects among a set of candidate projects, considering a budget constraint in which user's cost is being minimized. Network design problem is one of the complicated problems in transportation science, since it is a bi-level problem in which the lower level is a traffic assignment problem and the upper level is finding the best set of arcs. Meta-heuristic algorithms can be used to solve this problem. Although, there is no guarantee to find the optimal solution by Meta-heuristic algorithms, but they find good solutions in short times. The purpose of this study is comparing the efficiency of three Meta-heuristic algorithms for...
A cordic-based processor extension for scalar and vector processing
, Article 19th IEEE International Parallel and Distributed Processing Symposium, IPDPS 2005, Denver, CO, 4 April 2005 through 8 April 2005 ; Volume 2005 , 2005 ; 0769523129 (ISBN); 0769523129 (ISBN); 9780769523125 (ISBN) ; Fazeli, M ; Sarbazi Azad, H ; Sharif University of Technology
2005
Abstract
Trigonometric calculations play a significant role in scientific and multimedia applications. Such applications usually use vectors of data, thus it is essential to use SIMD-based computing for them. State of the art processors such as Pentium family processors have SIMD capabilities, MMX, SSE and SSE2 to name a few. But these extensions usually come short of performing trigonometric functions calculation. This paper presents a CORDIC-based vector processor extension to accelerate trigonometric calculations. The suggested architecture works with a vector of data, as well as scalar data. This architecture has been Synthesized both for FPGA and ASIC and the results have shown a significant...
Directed flooding: A fault-tolerant routing protocol for wireless sensor networks
, Article Systems Communications 2005, Montreal, 14 August 2005 through 17 August 2005 ; Volume 2005 , 2005 , Pages 395-400 ; Fazeli, M ; Miremadi, S. G ; Sharif University of Technology
2005
Abstract
Wireless sensor networks consist of small nodes with sensing, computation, and wireless communicationr capabilities. Many routing protocols have been specifically designed for WSNs where energy awareness is an essential design issue. Routing protocols in WSNs might differ depending on the application and network architecture. In this article, a fault-tolerant and energy efficient routing protocol for wireless sensor networks is proposed This protocol is called Directed Flooding, and is a descendant of the Flooding routing protocol, which consumes less energy, while maintaining high levels of fault-tolerance. This is done by Tending data in a specific aperture instead of broadcasting, which...
Parallel clustering on the star graph
, Article 6th International Conference on Algorithms and Architectures for Parallel Processing, ICA3PP, Melbourne, 2 October 2005 through 3 October 2005 ; Volume 3719 LNCS , 2005 , Pages 287-292 ; 03029743 (ISSN); 3540292357 (ISBN); 9783540292357 (ISBN) ; Sarbazi Azad, H ; Farivar, R ; Sharif University of Technology
2005
Abstract
In this paper, a parallel algorithm for data clustering is presented on a multi-computer with star topology. This algorithm is fast and requires a small amount of memory per processing element, which makes it even suitable for SIMD implementation. The proposed parallel algorithm completes in O(K+S 2-T 2) steps for a clustering problem of N data patterns with M features per pattern and K clusters, where N.M = S!, K.M = T!, and M=R!, on a s-star interconnection network. © Springer-Verlag Berlin Heidelberg 2005
Thermal Cyclic Effects on the Long-Term Behaviour of Elevated Floating Energy Pile Groups in Saturated Lightly Overconsolidated Clay by Centrifuge Modelling
, Ph.D. Dissertation Sharif University of Technology ; Jafarzadeh, Fardin (Supervisor)
Abstract
There is an increasing interest and use of energy foundations worldwide. Heat transfer from/to energy piles may cause plastic contraction of soft clay with a low overconsolidation ratio (OCR) during heating and cooling. This can influence pile-soil interaction due to thermally induced excess pore water pressure and changes of lateral stress acting on the pile.These thermally induced phenomena cause additional plastic settlement of the soil and pile. The irreversible settlement may cause serviceability or even ultimate limit state problems for floating energy piles whose capacity is mainly derived from shaft resistance. Due to intended operational needs or by accident, cyclic non-symmetrical...
Reliability Analysis of Concrete Gravity Dam with Foundation's Parameters Uncertainty Based on Nonlinear Finite Element Model
, M.Sc. Thesis Sharif University of Technology ; Ghaemian, Mohsen (Supervisor) ; Toufigh, Vahab (Supervisor)
Abstract
In this study reliability and sensitivity analysis of the parameters of a concrete gravity dam have been proposed regarding to their probabilistic behavior. At first, the uncertainty of concrete fracture energy (GF), Foundation’s elasticity modulus (E_f), and the Peak ground acceleration (PGA) are considered according to their probability density function (pdf). The uncertainty sources are inserted in the model using the Latin Hyper Cube Sampling method (LHS) in order to do reliability analysis of the model. Monte Carlo method is one of the most popular methods for reliability analysis of numerical models. Taking this method in uncertainty analysis would evaluate the effects of the inputs on...