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sharifzadeh-kermani--alireza
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Towards Estimation of Trunk Muscle Forces with a Bio-Inspired Control Strategy of Neuro-Osteoligamentous Finite Element Lumbar Spine Model
, M.Sc. Thesis Sharif University of Technology ; Arjmand, Navid (Supervisor) ; Vossoughi, Gholamreza (Supervisor) ; Parnianpour, Mohamad (Co-Supervisor)
Abstract
Low back pain (LBP), the leading cause of disability worldwide, remains one of the most common and challenging occupational musculoskeletal disorders. The effective assessment of LBP injury risk, and the design of appropriate treatment modalities and rehabilitation protocols, require accurate estimation of the mechanical spinal loads during different activities. This study aimed to: 1) develop a novel 2D beam-column finite element control-based model of the lumbar spine and compare its predictions for muscle forces and spinal loads to those resulting from a geometrically-matched equilibrium-based model; 2) test, using the foregoing control-based finite element model, the validity of the...
Distributed Computation of Centrality Measures in Dynamic Complex Networks
, M.Sc. Thesis Sharif University of Technology ; Hematyar, Ali Mohammad Afshin (Supervisor) ; Kavousi, Kaveh (Supervisor)
Abstract
Complex networks represent a wide diversity of systems in nature and human interactions. Networks are graphs that describe the structures of interacting systems and give significant information about the patterns of connections between the nodes in a particular system. In turn, having knowledge about the structure of networks and their arrangements enables one to make certain types of predictions about their behavior of network.Network methods have had profound influence in many domains and fields in the past decade. Centrality measures are very important tool for analysis complex networks, in real-world complex networks are heterogeneous structures, all their components such as nodes...
Estimation of trunk muscle forces using a bio-inspired control strategy implemented in a neuro-osteo-ligamentous finite element model of the lumbar spine
, Article Frontiers in Bioengineering and Biotechnology ; Volume 8 , 2020 ; Arjmand, N ; Vossoughi, G ; Shirazi Adl, A ; Patwardhan, A. G ; Parnianpour, M ; Khalaf, K ; Sharif University of Technology
Frontiers Media S.A
2020
Abstract
Low back pain (LBP), the leading cause of disability worldwide, remains one of the most common and challenging problems in occupational musculoskeletal disorders. The effective assessment of LBP injury risk, and the design of appropriate treatment modalities and rehabilitation protocols, require accurate estimation of the mechanical spinal loads during different activities. This study aimed to: (1) develop a novel 2D beam-column finite element control-based model of the lumbar spine and compare its predictions for muscle forces and spinal loads to those resulting from a geometrically matched equilibrium-based model; (2) test, using the foregoing control-based finite element model, the...
Studying the Problems Related to Latin Bitrades and 2-Simultaneous Coloring
, M.Sc. Thesis Sharif University of Technology ; Mahmoodian, Ebadollah (Supervisor)
Abstract
In the year 1997, at 16th British Combinatorial Conference Cameron introduced a new concept called 2-simultaneous coloring. He used this concept to reformulate a conjecture of Keedwell on the existence of critical partial Latin squares of a given type. After that, other people studied special cases of this conjecture. They also studied the relation between this conjecture and other well-known conjectures in Combinatorics, such as Cycle Double Cover Conjecture (CDC). Finally, in 2004 the general case of this conjecture was proven. In first two sections, in addition to defining some fundamental concepts, we represent the relation between Latin trade and 2-simultaneous coloring. Afterwards, by...
, M.Sc. Thesis Sharif University of Technology ; Behnia, Fereidoon (Supervisor)
Abstract
In this thesis, Particle Filter Methods are investigated in the context of moving targets tracking and the associated performance analysis. The application scope of this algorithm which is a particular case of Sequential Monte Carlo Method is far broader than tracking of moving targets. This algorithm can be used for mathematical calculations such as estimation of mathematical expectations, integrals, surface area of curves and many other mathematical calculations. In addition, it has applications in other branches of science like genetics. This algorithm is based on random sampling of a probability density function and resampling from the extracted samples. We change this algorithm in...
Multi-objective design and operation of Solid Oxide Fuel Cell (SOFC) Triple Combined-cycle Power Generation systems: Integrating energy efficiency and operational safety
, Article Applied Energy ; Volume 185 , 2017 , Pages 345-361 ; 03062619 (ISSN) ; Meghdari, M ; Rashtchian, D ; Sharif University of Technology
Elsevier Ltd
2017
Abstract
Energy efficiency is one of the main pathways for energy security and environmental protection. In fact, the International Energy Agency asserts that without energy efficiency, 70% of targeted emission reductions are not achievable. Despite this clarity, enhancing the energy efficiency introduce significant challenge toward process operation. The reason is that the methods applied for energy-saving pose the process operation at the intersection of safety constraints. The present research aims at uncovering the trade-off between safe operation and energy efficiency; an optimization framework is developed that ensures process safety and simultaneously optimizes energy-efficiency, quantified in...
Dosimetric evaluation of a newly developed radiochromic film for radiation processing
, Article Iranian Journal of Science and Technology, Transaction A: Science ; Volume 31, Issue 4 , 2007 , Pages 397-401 ; 10286276 (ISSN) ; Sohrabpour, M ; Sharifzadeh, M ; Sharif University of Technology
Shiraz University
2007
Abstract
In order to improve the performance of a newly developed radiochromic film, GIC-79, some dosimetric characteristics of this film have been studied based on relevant standard practice. The present study describes some parameters that may affect the dosimeter response before, during, and after irradiation. The effect of absorbed dose rate on dosimeter response was determined by irradiating dosimeters at low absorbed dose rates with gamma rays. Calibration irradiations of dosimeters were performed with both gamma rays and also electrons to determine the effect of large difference absorbed dose rates on dosimeter response. In addition, post irradiation stability was obtained and also the...
Bi-level planning of distributed energy resources into existing transmission grids: Pathway to sustainable energy systems
, Article IET Generation, Transmission and Distribution ; Volume 16, Issue 24 , 2022 , Pages 4963-4979 ; 17518687 (ISSN) ; Saber, H ; Sharifzadeh, M ; Sharif University of Technology
John Wiley and Sons Inc
2022
Abstract
This paper presents a novel stochastic planning framework for the integration of renewable distributed energy resources (DERs) into existing power systems without relying on new investments in the transmission networks. The upper-level problem of the proposed model aims at minimizing the total expected social cost of supplying demand that includes the expected cost of getting energy from conventional generating units and DERs, the congestion cost of transmission networks, and the greenhouse gas (GHG) emission cost, while each of the privately invested DER satisfies a specified rate of return. The lower-level problem clears the electricity market to find locational marginal prices (LMPs) and...
Secure steganography using Gabor filter and neural networks
, Article Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) ; Volume 4920 LNCS , 2008 , Pages 33-49 ; 03029743 (ISSN); 3540690166 (ISBN); 9783540690160 (ISBN) ; Zahedi Kermani, Z ; Sharif University of Technology
2008
Abstract
The main concern of steganography (image hiding) methods is to embed a secret image into a host image in such a way that it causes minimum distortion to the host; to make it possible to extract a version of secret image from the host in such a way that the extracted version of secret image be as similar as possible to its original version (this should be possible even after usual attacks on the host image), and to provide ways of embedding secret images with larger size into a given host image. In this paper we propose a method that covers all above mentioned concerns by suggesting the idea of finding from an image data base, the most suitable host for a given secret image. In our method,...
A robust steganography algorithm based on texture similarity using Gabor filter
, Article 5th IEEE International Symposium on Signal Processing and Information Technology, Athens, 18 December 2005 through 21 December 2005 ; Volume 2005 , 2005 , Pages 578-582 ; Jamzad, M ; Sharif University of Technology
2005
Abstract
The main concern of steganography (image hiding) methods is to embed a secret image into a host image in such a way that the host should remain as similar as possible to its original version. In addition the host image should remain robust with respect to usual attacks. In this paper we present a method that tries to cover all above mentioned concerns. The secret and host images are divided into blocks of size 4 × 4. Each block in secret image is taken as a texture pattern for which the most similar block is found among the blocks of the host image. The embedding procedure is carried on by replacing these small blocks of the secret image with blocks in host image in such a way that least...
Quantification of technological progress in greenhouse gas (GHG) capture and mitigation using patent data
, Article Energy and Environmental Science ; Volume 12, Issue 9 , 2019 , Pages 2789-2805 ; 17545692 (ISSN) ; Triulzi, G ; Magee, C. L ; Sharif University of Technology
Royal Society of Chemistry
2019
Abstract
Greenhouse gas emissions from anthropogenic sources are believed to be the main cause of global warming and climate change. Furthermore, fossil fuels are forecasted to remain the dominant source of energy in the near future. Therefore, capture and sequestration of greenhouse gases and in particular carbon dioxide is likely to be a major pathway toward environmental protection and energy sustainability. Such clarity has stimulated an intense and diverse range of research into various capture and mitigation technologies, which race with global warming in real-time. Quantification of the performance improvement rates of these technologies can inform decision-makers' long-term investment...
An Empirical Exploration of Social-business Tensions, and their Implications for its Sustainability: An Empirical Study from the Emerging Market of Iran
,
M.Sc. Thesis
Sharif University of Technology
;
Tasavori, Misagh
(Supervisor)
Abstract
Social business is a type of business whose first priority is to influence and solve a social problem, and unlike commercial businesses, the second priority is to maximize profits. This type of business sees earning money as a means to sustain itself and increase social impact. According to this definition, the mission of social businesses has a dual nature that these businesses are trying to achieve a balanced balance between both social and economic aspects of their mission. Leading research seeks to focus on social businesses within Iran to address how these businesses manage the tensions that arise from their dual mission. This research has tried to use the communication network approach...
An All-Optical NoC with Multicasting Capability
, M.Sc. Thesis Sharif University of Technology ; Hesabi, Shahin (Supervisor)
Abstract
The importance of power consumption in high performance multiprocessors, combined with power reduction capability of on-chip optical interconnects, offers optical network-on-chip (ONoC) as a new technology solution which can deliver considerably higher bandwidth and lower latencies with significantly lower power dissipation than an interconnection network based only on electronic signaling. An on-chip network should be able to support multicast communications efficiently whether it is an optical or electrical network. On the other hand, multicast communications in optical networks-on-chip has been implemented using shared bus which is not scalable. Moreover, most of optical on-chip...
Inertial Guidance and Control of an Axisymmetric Flying Vehicle with a Spinning Part
, M.Sc. Thesis Sharif University of Technology ; Nobahari, Hadi (Supervisor)
Abstract
In this work, inertial guidance and control of an axisymmetric flying vehicle with a spinning part is performed based on dynamic modeling and seven degree of freedom simulation. Flying vehicle is composed of front and aft bodies and these bodies are connected to each other via a hydrodynamic bearing. Front body is roll isolated from the aft body and includes all necessary guidance and control equipments such as sensors, canard set and so on. The control fins, located on the nose, is used to control the roll angle of the nose and to execute the lateral acceleration commands. Also, the aft body is freely rolling and includes the stabilizing fins. In this project, the translational and...
Macrostructure and Mechanical Properties of Structural Composite of Aluminum and Stainless Steel Net Processed by Casting and Rolling
, M.Sc. Thesis Sharif University of Technology ; Akbarzadeh, Abbas (Supervisor)
Abstract
Having the high strength to weight ratio has been made the composites special materials very important these days. The low density of aluminum and its appropriate corrosion properties make it a good choice for metallic matrix. Also, the high tensile strength of stainless steel fibers can helps as a reinforcement in the composite to improve its mechanical properties. Enhancing the bonding of composite’s components can helps it to develop its properties. Casting is an appropriate process for making an aluminum matrix containing steel fibers as reinforcement in a structural composite. In addition, rolling process can remove so many defects made by casting, and improve joining of fibers and...
Free Vibration Analysis of a Functionally Graded Nanotube Under an Initial Stress Using Nonlocal Elasticity Theory
, M.Sc. Thesis Sharif University of Technology ; Eskandari, Morteza (Supervisor)
Abstract
In this study, flexural vibration of a functionally graded nanotube under an initial stress is investigated. The small scale effect is taken into consideration based on Eringen’s nonlocal elasticity theory. The material properties are assumed to vary exponentially along the depth direction. The complete effect of the initial stress is taken into account in the problem formulation. The governing equations of motion are derived by using the Hamilton’s principle on the basis of the nonlocal Timoshenko beam theory. An analytical solution of the governing equations, for free vibration of a simply-supported nanotube is presented. Numerical results are presented to investigate the effect of the...
Approximation Algorithms for the Matroid-Constraint Maximum Subdeterminant
, M.Sc. Thesis Sharif University of Technology ; Ebrahimi Brojeni, Javad (Supervisor)
Abstract
let Mn n be a positive semmi definite matrix and M:= (U; B) be a matroid. Consider the problem of finding S 2 B such that det(MS;S) is maximized, in witch MS; S is the submatrix of M, restricted to rows and columns of S. This problem has a variety of applications including page ranking algorithms. The problem above is an NP-hard problem in the general case. However, there are several approximating and estimating algorithms for some special cases, which are interesting. Also, exactly solving the problem is NP-hard, even for some special matroids. As an example, one can consider the uniform matroids. Khachiyan introduced a greedy algorithm with dd approximation factor. Afterward, Di summa et...
Adsorption behavior of a Gd-Based metal-organic framework toward the quercetin drug: effect of the activation condition
, Article ACS Omega ; Volume 7, Issue 45 , 2022 , Pages 41177-41188 ; 24701343 (ISSN) ; Shamloo, A ; Shojaei, A ; Sharifzadeh, M ; Sharif University of Technology
American Chemical Society
2022
Abstract
A carboxylate gadolinium-based metal-organic framework (Gd-MOF) is an exceptional candidate for magnetic resonance imaging agents, but its low drug adsorption capacity hinders this MOF from being used as a theragnostic agent. In this work, the Gd-MOF was synthesized by a simple solvothermal method. Then, different activation situations, including various solvents over different time periods, were applied to enhance the specific surface area of the synthesized MOF. Different characterization analyses such as X-ray diffraction and Brunauer-Emmett-Teller along with experimental quercetin adsorption tests were done to study the crystalline and physical properties of various activated MOFs. In...
PAPR reduction of OFDM signals using harmony search algorithm
, Article 2011 18th International Conference on Telecommunications, ICT 2011, 8 May 2011 through 11 May 2011, Ayia Napa ; 2011 , Pages 90-94 ; 9781457700248 (ISBN) ; Salehinejad, H ; Talebi, S ; Sharif University of Technology
2011
Abstract
Orthogonal frequency division multiplexing (OFDM) is one of the widely used multiplexing techniques in wireless communications and especially cognitive radio networks. One of the key challenges of this technique is its high peak to average power ratio (PAPR) of the transmitted signal. This paper, introduces a new approach to PAPR reduction of OFDM signals using harmony search algorithm (HSA) based on the partial transmit sequence (PTS) method. The simulation results demonstrate that the proposed algorithm has better PAPR reduction performance as an accurate and low complexity approach for OFDM systems
Integrated Safe Design of Industrial Processes under Uncertainty
,
M.Sc. Thesis
Sharif University of Technology
;
Rashtchian, Davood
(Supervisor)
;
Sharifzadeh, Monireh
(Supervisor)
Abstract
Chemical industries are associated with hazardous chemicals and extreme operating conditions. Unsafe events can incur dramatic costs in terms of the loss of life, financial penalties and damages to the environment. Therefore, design of industrial processes which can be operated safely over a wide range of operating conditions is vital. Nevertheless, operation of industrial processes is a strong function of their design. If the process is initially poorly designed, ensuring its safe operation, if not impossible, would require costly modifications at the operational phases. This observation is due to the fact that process design decisions (e.g. design of process equipment) often have a...