Analysis of the Ultrasonic Cavitation on the Cancer Tumors

, M.Sc. Thesis Sharif University of Technology Maleki Birjandi, Morteza (Author) ; Ahmadian, Mohammad Taghi (Supervisor) ; Fallah Rajabzadeh, Famida (Supervisor)

Abstract

A complete understanding of high-intensity focused ultrasound-induced temperature changes in tissue requires insight into all potential mechanisms for heat deposition. Applications of therapeutic ultrasound often utilize acoustic pressures capable of producing cavitation activity. Recognizing the ability of bubbles to transfer acoustic energy into heat generation, a study of the role bubbles play in tissue hyperthermia becomes necessary. These bubbles are typically less than 50μm.
This dissertation examines the contribution of bubbles and their motion to an enhanced eating effect observed in a tissue-mimicking phantom. A series of experiments established a lationship between bubble...

Survey on the Effectiveness of Promotional and Communication Strategies Adopted by Financial Services

, M.Sc. Thesis Sharif University of Technology Sadeh, Farhad (Author) ; Birjandi, Heshmat (Supervisor)

Abstract

High volume domestic and international trade and business and their risks, force companies and business people to use financial services such as banks and insurance companies much more than ever, but heavy competition in this industry impel financial service managers to work hard on their marketing strategies and plans. Promotion and communication tools are one of the most important parts of each marketing campaign, but they are usually very costly and marketing managers have to find and use more effective techniques to manage their budget limitation. The purpose of this thesis is to find out the most important promotional and communication strategies in financial services industry and to...

Essential Factors Affect Consumer Buying Decision Adapted by Snowa Company With Reference to Refrigerator

, M.Sc. Thesis Sharif University of Technology Kazemzadeh, Elaheh (Author) ; Miremadi, Alireza (Supervisor) ; Birjandi, Heshmat (Supervisor)

Abstract

Consumers make buying decisions every day and managers or marketers try to understand why, when, where and how consumers make decisions to buy a product. One complex duty of managers is to understand consumer buying behavior in order to adapt their effort to consumers’ interest. Many studies gathered possible influent factors on consumer buying decisions that should consider as a basic of marketing strategy effort. In this time due to appearance large competitors and producers in the market of home appliance in Iran, consumers have more choice to select and purchase one product among different brands. In addition, high volume of advertizing, consistency of preliminary attribute among...

An energy efficient refractive structure for energy concentration on PV cells

, Article 2010 IEEE International Energy Conference and Exhibition, EnergyCon 2010, 18 December 2010 through 22 December 2010, Manama ; 2010 , Pages 648-651 ; 9781424493807 (ISBN) Kavehvash, Z ; Rajaii, M ; Birjandi, A. M ; Gholamrezaei, H ; Gholamrezaei, A ; Sharif University of Technology

2010

Abstract

In this paper a novel refractive structure for increasing the performance of photovoltaic cells1 is proposed. This structure which is named back-to-back-Fresnel lens is similar to conventional Fresnel lens used for energy concentration on PV cells while comprising some superior features. Among these features is its thinness, just like Fresnel lens, and lower loss of energy and simpler structure and design compared to a Fresnel lens with similar properties. The proposed lens is experimentally tested with a PV cell while the obtained results confirm its superior features

Speed limit of quantum metrology

, Article Scientific Reports ; Volume 13, Issue 1 , 2023 ; 20452322 (ISSN) Maleki, Y ; Ahansaz, B ; Maleki, A ; Sharif University of Technology

Nature Research 2023

Abstract

Quantum metrology employs nonclassical systems to improve the sensitivity of measurements. The ultimate limit of this sensitivity is dictated by the quantum Cramér–Rao bound. On the other hand, the quantum speed limit bounds the speed of dynamics of any quantum process. We show that the speed limit of quantum dynamics sets a fundamental bound on the minimum attainable phase estimation error through the quantum Cramér–Rao bound, relating the precision directly to the underlying dynamics of the system. In particular, various metrologically important states are considered, and their dynamical speeds are analyzed. We find that the bound could, in fact, be related to the nonclassicality of...

Ant colony algorithm for the shortest loop design problem [electronic resource]

, Article Computers and Industrial Engineering, Elsevier ; Volume 50, Issue 4, August 2006, Pages 358–366 Eshghi, K. (Kourosh) ; Kazemi, Morteza ; Sharif University of Technology

Abstract

In this paper, a new algorithm for solving the shortest loop design problem is presented. The shortest loop design problem is to find the shortest loop for an automated guided vehicle covering at least one edge of each department of a block layout. In this paper, first it is shown that this problem can be represented as a graph model. The properties of the presented model enable us to design a meta-heuristic based on ant colony system algorithm for solving the shortest loop design problem. Computational results show the efficiency of our algorithm in compare to the other techniques

Management Systems for Energy: Applicability and Effectiveness Assessment with Special Reference Country's Energy Sector

, M.Sc. Thesis Sharif University of Technology Birjandi Feriz, Maliheh (Author) ; Kaymaram, Farid (Supervisor) ; Bazari, Zabihollah (Supervisor)

Abstract

Due to increase of industrial plants and development of cities in the world, there is an increase in demand for all types of energy, especially fossil fuels.Consequently, energy related decisions have become an important factor in national and international political decision makings. Regarding to remarkable effects of energy decisions on economical, industrial, political, social and environmental aspects of our country and considering the importance of energy management in our country as an energy-based country, we have focused in this research on studying several energy management systems (national and international systems) and made an assessment on their applicability and effectiveness....

A novel enzyme based biosensor for catechol detection in water samples using artificial neural network

, Article Biochemical Engineering Journal ; Volume 128 , 2017 , Pages 1-11 ; 1369703X (ISSN) Maleki, N ; Kashanian, S ; Maleki, E ; Nazari, M ; Sharif University of Technology

Elsevier B.V 2017

Abstract

Biosensors could be used as digital devices to measure the sample infield. Consequently, computational programming along with experimental achievements are required. In this study, a novel biosensor/artificial neural network (ANN) integrated system was developed. Poly (3,4-ethylenedioxy-thiophene)(PEDOT), graphene oxide nano-sheets (GONs) and laccase (Lac) were used to construct a biosensor. The simple and one-pot process was accomplished by electropolymerizing 3,4-ethylenedioxy-thiophene (EDOT) along with GONs and Lac as dopants on glassy carbon electrode. Scanning electron microscopy (SEM) and electrochemical characterization were conducted to confirm successful enzyme entrapment. The...

Modeling carbon dioxide emission of countries in southeast of Asia by applying artificial neural network

, Article International Journal of Low-Carbon Technologies ; Volume 17 , 2022 , Pages 321-326 ; 17481317 (ISSN) Komeili Birjandi, A ; Fahim Alavi, M ; Salem, M ; Assad, M. E. H ; Prabaharan, N ; Sharif University of Technology

Oxford University Press 2022

Abstract

Energy and economy play a substantial role in environmental issues such as the emission of greenhouse gases. CO2 is one of the greenhouses that is hugely produced in industrial processes and other human being activities. The major share of CO2 emission is related to the energy-related activities. As a result, modeling the amount of produced CO2 by utilization of different energy sources must be considered. Moreover, by considering economic indicators such as gross domestic product, the accuracy of the model could be improved. In the present work, artificial neural network (ANN) with two transfer functions including normalized radial basis and tansig is used to model CO2 production of...

Modeling of severe shot peening effects to obtain nanocrystalline surface on cast iron using artificial neural network

, Article Materials Today: Proceedings ; Volume 3, Issue 6 , 2016 , Pages 2197-2206 ; 22147853 (ISSN) Maleki, E ; Sharif University of Technology

Elsevier Ltd 2016

Abstract

Severe plastic deformation methods such as severe shot peening are used in order to improve mechanical properties of the components by surface microstructure nanocrystallization. Severe shot peening is one of the popular mechanical surface treatments generally aimed at generating nanograined layer and compressive residual stress close to the surface. Moreover, artificial neural network has been used as an efficient approach to predict and optimize the engineering problems. In present study effects of conventional and severe shot peening on cast iron were modelled by means of artificial neural networks and they were compared. The obtained results indicate that severe shot peening has superior...

Modeling Reaction and Distribution of Water in Nanopores of the Cathode Catalyst Layer of PEM Fuel Cell

, M.Sc. Thesis Sharif University of Technology Nushak, Fatemeh (Author) ; baghalha, morteza (Supervisor)

Abstract

In the proton exchange membrane fuel cells (PEM, the produced water would be divided into two phases of vapor and liquid. distribution of both liquid and vapor phases in different cell layers affects the performance, the efficiency and the life of a fuel cell significantly. Moreover, Nano pores of the cathode catalyst layer are involved with some phenomena such as electrochemical reaction kinetics, heat and mass transfer and interface phase change. One of the most important problems in the performance of fuel cells is distribution of liquid water in the porous areas. Water flooding in fuel cells causes to delay in oxygen transport to active sites in the catalyst layer because the pores of...

Love Wave Propagation in a Functionally Graded Magneto-Electro-Elastic Half-Space with Quadratic Variations

, M.Sc. Thesis Sharif University of Technology Nobahar, Masoud (Author) ; Eskandari, Morteza (Supervisor)

Abstract

The propagation behavior of Love wave in functionally graded magneto-electro-elastic half-spaces with a quadratic variation is addressed. The magneto-electromechanical coupling factor, the dispersion relations, electric potential, magnetic potential and displacement are obtained analytically for both magneto-electrically open and short conditions. The effect of gradient coefficient on phase velocity, group velocity and magneto-electromechanical coupling factor are plotted and discussed. Research on the wave propagation in magneto-electro-elastic materials is still very limited. This work provides us with a theoretical foundation to design and practically apply SAW devices with high...

Elastic Analysis of a Surface Stiffened Transversely Isotropic Half-space Under a Buried Horizontal Point Load

, M.Sc. Thesis Sharif University of Technology Naghib, Hamed (Author) ; Eskandari, Morteza (Supervisor)

Abstract

In this study, the interaction between thin plate completely bonded to the transversely isotropic halfspace and a concentrated force applied horizontally (Mindlin-type force) are considered. This problem has been solved analytically. This problem is used as sample for thin solid films and surface coating technology, where the surface of solid is covered by thethin plate for increasing its stiffness. Moreover, this problem is a good sample when homogenous solid is subjected to contact loading and can be seen that mechanical properties of material which is near the solid surface varies; consequently, a two-phase solid is created.Because of the influence of noted inhomogeneity, solid is...

Modeling and Simulation of the Catalyst Regeneration Process of FCC Unit of Abadan Refinery

, M.Sc. Thesis Sharif University of Technology Loni, Zahra (Author) ; Baghalha, Morteza (Supervisor)

Abstract

Hydrodynamics plays a crucial role in defining the performance of fluidized beds. The numerical simulation of fluidized bed is very important in the prediction of its behaviour. From this point of view, in the present study a dynamic two dimensioanl model is developed for the modeling of regenerator system of a UOP fluid catalytic cracking (FCC) unit of Abadan refinery with a high-efficiency regenerator. Of the various modeling and simulation techniques, computational fluid dynamics (CFD) is employed in this thesis. Effects of gas velocity, the transient local solid volume fraction, pressure drop for gas and solid phase, solid holdup distribution and solid circulation pattern have been...

Secure- multiparty Computation Protocol for Privacy Preserving Data Mining

, M.Sc. Thesis Sharif University of Technology Maftouni, Mahya (Author) ; Amini, Morteza (Supervisor)

Abstract

Privacy preserving data mining helps organizations and companies not only to deal with privacy concerns of customers and regular limitations, but also to benefit from collaborative data mining. Utilizing cryptographic techniques and secure multiparty computation (SMC) are among widely employed approaches for preserving privacy in distributed data mining. The general purpose of secure multiparty computation protocols to compute specific functions on private inputs of parties in a collaborative manner and without revealing their private inputs. Providing rigorous security proof of secure multiparty computation makes it a good choice for privacy preservation, despite of its cryptographic...

Information-flow Analysis in Android Apps for Protecting User Privacy

, M.Sc. Thesis Sharif University of Technology Barkhordari, Alireza (Author) ; Amini, Morteza (Supervisor)

Abstract

The rapid growth of Android operating system alongside its open-source nature has made it as the most popular operating system of mobile devices. On the other hand, regarding the increasing computational power of mobile devices, a wide variety of applications are coming to this type of devices. Meanwhile unfortunately many malicious softwares trying to keep up with other applications, are targeting this popular operating system. Therefore with regard to the fact that this type of devices usually store private and sensitive information of their users, security of mobile operating systems is considered very important. Having this matter in mind, the goal of this research work has been...

Analysis of Slabs Stiffened by Cables and Pedestals

, M.Sc. Thesis Sharif University of Technology Mokhberi, Arsalan (Author) ; Eskandari, Morteza (Supervisor)

Abstract

In this study, a new concrete slab stiffened by concrete pedestals and steel cables is introduced. The slab system is studied by employing both analytical and numerical methods. The steel cables are connected to the edges of slab and the concrete pedestals mounted at the bottom face of slab act as the middle supports of cables. The tension force in the cable and its inclination results in upward forces acting at the bottom face of slab. With the aims of classical theory of thin plates and the superposition technique, the problem of a simply supported rectangular slab stiffened by cables is studied analytically. The obtained results are verified by a numerical modelling implemented in SAP2000...

Parametric Study of Telescopic Metallic Yielding Dampers

, M.Sc. Thesis Sharif University of Technology Misaghi, Mohammad (Author) ; Eskandari, Morteza (Supervisor)

Abstract

The parametric study of a new introduced metallic yielding damper called telescopic damper is addressed. The telescopic damper comprises of three concentric steel pipes connected together by lead shear keys. The inner and outer steel pipes are subjected to axial loading which results in the shear yielding of the embedded lead cylinders. The inner steel pipe has a lock which limits its movement to some certain extent and beyond this limit the outer tube activates. Employing ABAQUS software, the behavior of damper under cyclic loading is studied numerically. The finite element model is verified by available results in the literature. The effects of inner and outer steel pipes thickness,...

An Access Control System for Time Series Data in NoSQL Databases

, M.Sc. Thesis Sharif University of Technology Noury, Amir (Author) ; Amini, Morteza (Supervisor)

Abstract

An important class of applications which have been rapidly growing recently is the one that create and use time series data. These types of data sets are ordered based on the timestamps associated to their data items. In practice, traditional relational databases are unable to satisfy the requirements of these data sets; however, NoSQL databases with column-wide data structure are appropriate infrastructure for them. These databases are very efficient in read and write operations (especially for time series data, which are ordered) and are able to store unstructured data. Time series data may contain valuable and sensitive information; hence, they should be protected from the information...

Database Schema Extraction Prevention Through DBMS Error Handling

, M.Sc. Thesis Sharif University of Technology Naghdi, Sepideh (Author) ; Amini, Morteza (Supervisor)

Abstract

Nowadays large volume of sensitive data of organizations are stored in the databases. Thus, databases are attractive to the attackers to execute different types of attacks with different purposes. The useful information that attackers try to achieve in the preliminary steps of the attacks against the databases, is the database structure or schema. One of the popular approach to extract the schema of a database is to analyze the returned error messages from its DBMS. Hence, a solution to prevent schema disclosure via the error messages is customizing and modifying them. To achieve this goal, in this thesis, we propose a framework to handle and customize the error messages automatically and...