Cost-benefit Analysis of Insurance Companies in Usage-based and Common Car Insurance Market

, M.Sc. Thesis Sharif University of Technology Dabbagh, Esmaeil (Author) ; Samimi, Amir (Supervisor)

Abstract

Car usage-based insurance is recently introduced to the market of car insurance and because these contracts are new in this market, Insurers and other beneficiaries are eager to know about the outcome of them. In this study, the outcome of these contracts and equilibrium of the market have been analyzed from the view of insurers. An insurer as a profitable firm want to analyze its costs and benefits, and as a result, one of the most important factors from the view of the insurer is the cost-benefit analysis when the insurer enters into the new market of usage-based insurance. For this analysis, by contract selection and insurer loss payment data, insurer cost and benefit forecasting models...

Synthesis and Characterization of Cu2ZnSnS4 (CZTS)Thin Films Prepared by Pulsed Laser Deposition Technique

, M.Sc. Thesis Sharif University of Technology Dabbagh, Mohammad Mahdi (Author) ; Mahdavi, Mohammad (Supervisor)

Abstract

The Cu2ZnSnS4 (CZTS) quaternary compound, with suitable optical and electrical properties, is one of the most interesting materials for absorber layer of thin film solar cell. Since all constituents of CZTS, are abundant in earth’s crust and non-toxic, it is a proper replacement for the materials like CdTe and CuInSe2. The CZTS pellet was synthesized by the solid-state reaction and deposited on soda lime glass substrates by pulsed laser deposition (PLD) method. PLD technique has the advantages of offering stoichiometric preservation during the materials transformation from target to substrate and good crystallinity due to the highly energetic species. CZTS has was deposited in order to...

Effect of response related weighting matrices on performance of active control systems for nonlinear frames

, Article International Journal of Structural Stability and Dynamics ; Volume 17, Issue 3 , 2017 ; 02194554 (ISSN) Mohebbi, M ; Joghataie, A ; Rasouli Dabbagh, H ; Sharif University of Technology

World Scientific Publishing Co. Pte Ltd 2017

Abstract

In this paper, the effect of various arrangements of displacement, velocity and acceleration related weighting matrices on the performance of active control systems on nonlinear frames has been studied. Different arrangements of weighting matrices and feedback combinations of the response have been considered to design the active controllers using a single actuator for reducing the response of an eight-storey bilinear hysteretic frame under white noise excitations. The nonlinear Newmark-based instantaneous optimal control algorithm has been used, where the distributed genetic algorithm (DGA) is employed to determine the proper set of weighting matrices. For each set of feedback and weighting...

Cross-Layer Design to Improve Wireless Protocol for Smart Home Application

, M.Sc. Thesis Sharif University of Technology Abbasloo, Sohail (Author) ; Sanaei, Esmaeil (Supervisor)

Abstract

One of the main challenges in the design of wireless sensor networks (WSNs) is minimizing the energy consumption while simultaneously maximizing the performance of sensors. In this thesis, we have considered WSNs based on beacon enabled IEEE 802.15.4/Zigbee Standards with low rate applications like temperature, humidity and light sensing, which mainly have been used in a smart home environment, and proposed a cross-layer design to overcome this challenge. The design involves an optimizer module that captures the application layer and MAC sub layer behaviors. Based on these behaviors, the optimizer dynamically changes the rate of node’s traffic at the application layer and the priority of...

Using Wireless Sensor Network for Energy Management of Future Homes

, M.Sc. Thesis Sharif University of Technology Mohammadi, Sattar (Author) ; Sanaei, Esmaeil (Supervisor)

Abstract

We present a home energy management system that is able to manage home energy demand and resources to achieve minimum household payment in electricity dynamic pricing.Communication is used to collect needed data from the home energy system members and users in order toimprove demand and resources management. Some of the needed data comes from appliances and solar panels by wireless sensor network and some other is received from home users by a user interface.
Two algorithms are proposed that the first algorithm goal is to minimizing household payment and the second algorithm goals are flexible implementiation and decreasing household payment. To decrease household payment, these...

Design and Implementation of an Integrated PA for UHF-RFID Applications with Resolved Substrate Noise Problem Due to the PA

, M.Sc. Thesis Sharif University of Technology Dabbagh Rezaei, Vahid (Author) ; Sharif Bakhtiar, Mehrdad (Supervisor)

Abstract

The use of Radio Frequency Identification is increasing rapidly. The reason is the capability to transfer data wirelessly without line-of-sight necessity, high data rate and long read range. The main advantage of barcode is its lower cost which has ensured its existence for many years. The applications and materials that are identified by RFID increase as the price of RFID tags decrease. This Project deals with the transmitter of an Integrated RFID Reader for the UHF band. The bottleneck of the design is to integrate a high power PA with the noise sensitive blocks such as synthesizer. A layout design guide along with circuit considerations is presented to alleviate the problem of this...

Ontology-Based Android Malware Forensics

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

Abstract

Today, smart devices have become an integral part of everyday life. The Android operating system is also the most popular operating system of these devices, and as a result, various malwares are produced and distributed for this operating system every day. This makes it especially important to investigate these malwares. This includes finding people involved in the development and distribution of malware, as well as discovering other malwares created by them. Discovering other involved entities, such as social media accounts, websites, Android store accounts, and taking steps to prevent malware from being distributed by them is another aspect of this story. In order to deal with organized...

Pure sulfide Cu2ZnSnS4 layers through a one-step low-temperature PLD technique: Insight into simulation on modified back contact to overcome the barrier of MoS2

, Article Materials Science and Engineering B: Solid-State Materials for Advanced Technology ; Volume 262 , 2020 Heidariramsheh, M ; Haghighi, M ; Dabbagh, M. M ; Mahdavi, S. M ; Sharif University of Technology

Elsevier Ltd 2020

Abstract

Targeting on the selenium free, pure sulfide kesterite compound (CZTS) allows retention of the higher band gap nontoxic absorber for a single-junction solar cell. In this work, CZTS thin films were deposited by the PLD method and the Structural/optical properties, as well as Mott–Schottky analysis, were studied at different substrate temperatures. Without undergoing the sulfurization process, the single-phase CZTS thin film is prepared at 300 ℃. In the second step, a numerical simulation is performed using the solar cell capacitance simulator to study the effect of the grading layer of MoS(Se)2 on the rear side of pure sulfide kesterite based solar cells. The device with a MoSe2 coated...

Synthesis of magnesium-based Janus micromotors capable of magnetic navigation and antibiotic drug incorporation

, Article New Journal of Chemistry ; Volume 44, Issue 17 , 2020 , Pages 6947-6957 Paryab, A ; Madaah Hosseini, H. R ; Abedini, F ; Dabbagh, A ; Sharif University of Technology

Royal Society of Chemistry 2020

Abstract

In the present study, bubble-driven magnesium-based micromotors were fabricated through a shading method, and the potential of magnetic guidance of magnesium-based Janus micro/nanomotors through functionalization with superparamagnetic iron oxide nanoparticles (SPIONs) was investigated for the first time. SPIONs had physical electrostatic attraction with the positively charged magnesium spheres due to negative charges on their surfaces. It was also found that upon applying a field gradient, the micromotors’ velocity increased by 13% unlike other magnetically navigated spherical magnesium-based micromotors which only show a change in direction. In this work the cytotoxicity of the moving...

Semantic segmentation with multiple contradictory annotations using a dynamic score function

, Article IEEE Access ; Volume 11 , 2023 , Pages 64544-64558 ; 21693536 (ISSN) Esmaeil Akhoondi, P ; Soleymani Baghshah, M ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2023

Abstract

Semantic Segmentation aims to partition an image into separate regions where each region conveys certain valuable information. In recent years, deep learning models have achieved high performance in this task. However, when several ground truth segmentations are available, aggregating the information of these segmentations into a single ground truth becomes a crucial pre-processing step. This task becomes challenging when the segmentations are contradictory and the existing classes in the segmentations are imbalanced. An elegant example is the grading of Prostate Cancer in the Gleason 2019 Challenge dataset. This dataset provides six annotations of relatively high contrast from expert...

Nonlinear Analysis of 3D Irregular concrete Structures by Endurance Time Method

, M.Sc. Thesis Sharif University of Technology Khaki, Ali (Author) ; Esmaeil Pourestekanchi, Homayun (Supervisor)

Abstract

The structure performances during past earthquakes indicate the importance of predicting behaviors of irregular structures under earthquakes. If the irregularity exceeds an expected limit, a seismic analysis should be carried out by a dynamic analysis method. The Endurance Time (ET) is a time-history method, base on dynamic analysis for seismic analyzing and designing the structures, in which structures are subjected to intensifying accelerogram functions and their Endurance Time is measured. One of the most applicable methods for RCF analysis is the Concentrated Hinge Model which is used in this research too. The needed parameters for modeling plasticity in concentrated hinge are achieved...

Development of ET Method Compatible With Seismic
Design Codes

, M.Sc. Thesis Sharif University of Technology Khazaie, Mohammad (Author) ; Esmaeil Pourestekanchi, Homayoon (Supervisor)

Abstract

In recent years, by development of computer and analytical software, engineers intended to do complicated and delicate dynamic analysis instead of static ones. This cause reduction in uncertainty in structures analysis and designing, that improves environmental, economical, and safety performance. Currently there are two common methods which are accepted in major building codes, they are spectral and time history dynamic analysis which the former analyzes structures by using design code spectra based on determination of structures’ dynamic haracteristics, and the latest do it by imposing ground motions on the structure. The spectral dynamic analysis method has some errors and causes...

Three Dimensional Non-Linear Seismic Analyses of Buildings, Using Endurance Time Method

, Ph.D. Dissertation Sharif University of Technology Valamanesh, Vahid (Author) ; Esmaeil Pourestekanchi, Homayun (Supervisor)

Abstract

Endurance Time Method (ET) is a type of dynamic pushover procedure in which the structure is analyzed under special series of accelerograms, called ET acceleration Functions (ETAF) and the response of structure is sketched versus time until the collapse state. With evaluating response curve and the time which damage in structure reach the expected value, the final assessment of structure can be made. In this dissertation, the application of ET method for Non-linear 3 dimensional seismic analysis of steel moment frames under earthquake multicomponent excitation is investigated. For this purpose, various patterns of ET loading are investigated and the most appropriate algorithm in...

Application of Endurance Time Method in Nonlinear Dynamic analysis of Elevated Tanks

, M.Sc. Thesis Sharif University of Technology Rahmati, Mohammad (Author) ; Esmaeil Pourestekanchi, Homayoon (Supervisor)

Abstract

Endurance Time (ET) is a fairly comprehensive analytical method based on time history analysis applied for evaluating structural systems excited by dynamic loading of earthquake. In such evaluation assessment measure is based on endurance time of structure versus applied accelerogram function and parameters such as stiffness, lateral resistance, period of vibration and dynamic characteristics are not used directly. In this research nonlinear dynamic analysis of elevated steel tanks with laterally braced framed tower under the loading of earthquake records and ET accelerograms was studied and effectivity of ET method in analyzing such elevated tanks was verified. Due to complication of...

Application of Endurance Time Method in Seismic Analysis of Bridges

, M.Sc. Thesis Sharif University of Technology Ghaffari, Esmaeil (Author) ; Esmaeil Pourestekanchi, Homayun (Supervisor)

Abstract

In this research the appilication of a new method named Endurance Time (ET) analysis in seismic analysis of multi span bridges in linear and nonlinear ranges is investigated. Endurance Time is a time history based method of seismic analysis. In this method structure is subjected to an intensifying predefined acceleration function and different damage indices of the structure are evaluated through analysis time. The Endurance Time criterion and the Endurance Time acceleration functions have been generated in previous researchs of ET group. Using 7 earthquake records which are selected from hundred ones of PEER database based on FEMA p695 recommendations, several scaling methods are used to...

Application of Endurance Time Method in Seismic Analysis of RC Cooling Towers

, M.Sc. Thesis Sharif University of Technology Tavazo, Hassanali (Author) ; Esmaeil Pourestekanchi, Homayoon (Supervisor)

Abstract

In the earthquake conditions, the collapse of cooling towers can stop power station activities and heavy financial losses that can be led increasing disaster dimentions finally. In this thesis for analysis of concrete hyperbolic cooling towers and generally for analysis of shell structures, the endurance time (ET) method benefits are used. Also with comparision between ET and standard time history method (THA), accuracy and probable errors of ET method are discussed. It should be noted that ET method is a new time history based method of seismic analysis expect that in this method, structure is imposed under specific intensifying acceleration functions. ET method is capabable for nonlinear...

Comparison of Endurance Time Method with Time History Dynamic Analysis in Evaluating Irregular Concrete Structure

, M.Sc. Thesis Sharif University of Technology Akbari, Reza (Author) ; Esmaeil Pourestekanchi, Homayuon (Supervisor)

Abstract

The Endurance Time Method is reprehensively new and comprehensive method for analyzing and designing the structure quality in based on performance that is related on time history analysis for investigating structure systems under dynamical instigation in result of earthquake. In this evaluation the index comparison in based on endurance time against of applied acceleration function. The result of the structure will plot against time, until the structure will achieve to a special amount of damage. The high endurance time means high performance. While the damage index will maintain less than allowable limit until endurance time, the structure will be approvable.In this project the ability of...

Investigation of Endurance Time Method in Seismic Analysis of Vertically Irregular Elastic Steel Frames

, M.Sc. Thesis Sharif University of Technology Ahmadi, Mehdi (Author) ; Esmaeil Pourestekanchi, Homayun (Supervisor)

Abstract

Recent studies show that irregular structures have been damaged more than regular ones during earthquakes. This proves importance of seismic response determination of this type of structures. Today, Codes define irregularity in structures and restrict seismic analysis and design of these types of structures. The Endurance Time (ET) method is a time-history based dynamic pushover procedure for seismic analysis and design of structures that has been recently proposed in Sharif University. This thesis illustrates ET capability in analysis and design of vertically irregular frames. Irregular frames with three, seven and twelve story high were designed with two types of mass and stiffness...

Static and Dynamic Modeling of Post Fixed Grooved Clay Brick System Behaviour for Wall and Surfaces Construction Without Mortar and With High Planarity

, M.Sc. Thesis Sharif University of Technology Mahmoodi, Mostafa (Author) ; Esmaeil Pourestekanchi, Homayoon (Supervisor)

Abstract

Nowadays using traditional hollow clay brick in buildings to make walls and partitionsisvery common. Non-load-bearing walls in buildings are used as architectural elements for design purposes and protecting the people that are inside the building from cold , heat and sound pollution .Due to the new technologies and developing building codes interms of structure , non-load-bearing walls behaviour that is always neglected seems necessary to be considered. In this research we have investigated the static and dynamic behaviour of a patented non-load-bearing wall made up of a claybrick system with specially-designed-precision grooved faces that eliminates conventional cement mortar and results...

Seismic Analysis of Horizontally Curved Bridges by Endurance Time Method

, M.Sc. Thesis Sharif University of Technology Mehraein, Mehrdad (Author) ; Esmaeil Pourestekanchi, Homayoon (Supervisor)

Abstract

With improvement of design and analysis techniques, use of irregular bridges has been expanded. These improve the aesthetics of urban spaces as well as providing shorter highways in impassables. Horizontally curved bridges are among the type of structures, which needs to be designed based on three-dimensional analysis. In this thesis, three-dimensional nonlinear analysis was performed by Endurance Time Method (ET) on horizontally curved bridges. Nonlinear models have been analyzed under ET acceleration functions. Comparing ET results in DBE level with earthquake responses, the difference between these two methods were determined. ET estimated earthquake responses with good accuracy;...