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Quantum Communications with Structured Light
, M.Sc. Thesis Sharif University of Technology ; Bahrampour, Alireza (Supervisor) ; Farman, Farnaz (Co-Supervisor)
Abstract
Orbital angular momentum (OAM)and the radial quantum number (p) in infinite-dimensional Hilbert space are two degrees of freedom of light which are associated with the spatial distribution of the electromagnetic field. They are attracting a growing interest for their potential in communication applications ranging from classical communication to fundamental tests of quantum mechanics,quantum communication and quantum cryptography. However, a third party trying to eavesdrop information from communication channel and treat channel security , quantum cryptography or quantum key distribution (QKD) is the secure communication method which is based on the quantum mechanical principles can...
Angular Momentum Compensation and Sorting of Optical Modes in Optical Fiber
, Ph.D. Dissertation Sharif University of Technology ; Bahrampour, Alireza (Supervisor) ; Farman, Farnaz (Supervisor)
Abstract
Electromagnetic field modes have several degrees of freedom, including polarization, orbital angular momentum, and radial order, which can be described by orthogonal modes. By using all the degrees of freedom in communication, the channel capacity can be increased dramatically. With the aim of increasing the capacity and correcting the errors created along the optical fiber, two important issues have been addressed in this thesis. First, the states propagated in the fiber may be disrupted by many unwanted factors and may not be transmitted correctly. Therefore, measures should be taken to minimize the impact of these factors as much as possible or to compensate for their effects. In the...
Detection of High Frequency Oscillations from ECoG Recordings in Epileptic Patients
, M.Sc. Thesis Sharif University of Technology ; Hajipour, Sepideh (Supervisor) ; Sinaei, Farnaz (Co-Supervisor)
Abstract
The processing of brain signals, including the electrocorticogram (ECoG) signal, is widely used in the investigation of neurological diseases. Conventionally, the ECoG signal has frequency components up to the range of 80 Hz. Studies have proven that in some conditions, such as epilepsy, the brain signal includes frequency components higher than 80 Hz, which are called high-frequency oscillations (HFO). Therefore, HFOs are recognized as a biomarker for epilepsy. The aim of this thesis is to review the previous methods of detecting HFOs and to present new methods with greater efficiency in the direction of diagnosis or treatment of epileptic patients. For this purpose, we used the ECoG data...
Simulatin of Reinforcement Corrosion in Pozzolanic Concrete by Neural Network
, M.Sc. Thesis Sharif University of Technology ; Afshar, Abdollah (Supervisor)
Abstract
One of the most important factors of reducing durability of concrete structures is corrosion of steel reinforcement in concrete. In this paper, corrosion behavior of reinforcing steel in concrete is investigated in two different methods of protection based on neural network. As regard the first method, pozzolanic additives with optimized percentage were added to Concrete mix design (the percentage of these additives are 25% Weight of cement of fly ash, Micro silica with 10 percent of weight of cement and 25% of Blast Furnace slag weight of cement). In the second approach of protection, 0/5 percent weight of cement of ferrogard 901 inhibitor is added to basic mix concrete design and the...
Design of an Optimal Site Deployment Procedure in Different Air-Defense Scenarios
, M.Sc. Thesis Sharif University of Technology ; Fathi, Mohsen (Supervisor)
Abstract
One of the most important issues among defense is the increasing of the defense power using present facilities. Therefore, optimal setting and arrangement of equipment by considering different air-to-earth attack of enemy without knowing of properties and capabilities of available systems may not be possible. So, using defense equipment considering properties of them, and paying attention to existence restrictions and effective elements can have an effective role with the design of suitable algorithm.The main purposes of this thesis are: maximization of the efficiency of a defense system against. aerial invader targets, achieving the best arrangement of defense equipment based on suggested...
Improving CCA-based methods for SSVEP classification using a new graph reference signal
, Article 2024 31st National and 9th International Iranian Conference on Biomedical Engineering, ICBME 2024 ; 2024 , Pages 468-475 ; 979-833152971-0 (ISBN) ; Sardouie, H ; Sharif University of Technology
2024
Abstract
Brain-computer interface (BCI) systems enable individuals to control external devices through brain activity. Among the various paradigms in the BCI domain, steady-state visual evoked potentials (SSVEPs) are particularly dominant. One of the most effective methods for frequency detection in SSVEP-based BCIs is canonical correlation analysis (CCA). In standard CCA, a sine-cosine signal is used as a reference signal, which may not be optimal for SSVEP recognition. In this paper, we propose a novel graph reference signal that preserves a sinusoidal form, yet exhibits temporal smoothness on a graph learned from the reference signal. We employ an alternating optimization approach to obtain the...
Optimizing the Balance Between Resolution, Field-of-View and Depth-of-field in Three-dimensional Imaging
, Ph.D. Dissertation Sharif University of Technology ; Mehrany, Khashayar (Supervisor) ; Bagheri, Saeed (Supervisor) ; Massoumian, Farnaz (Co-Advisor)
Abstract
In this thesis a rigorous approach toward systematic quantification of qualitative fea-tures in a three-dimensional (3D) integral imaging is proposed. Incorporating the concepts of sampling rays and sampling points, the first approach is based on geo-metrical optics and quantifies the lateral and depth resolutions of the system within the field-of-view (FOV) and depth-of-field (DOF). The obtained results are justified through experiments. In the next step, the principals of wave optics are employed to measure the lateral and depth resolutions of the system. To this end, the concept of point-spread function is generalized to three-dimensional imaging systems. Through this systematic approach the...
Implementing a Visual Assistant for Elderly Care using CCTV Camera
, M.Sc. Thesis Sharif University of Technology ; Mohammadzadeh, Naejesolhoda (Supervisor)
Abstract
In this research, an intelligent and integrated system for elderly fall detection monitoring based on CCTV cameras has been designed and implemented. The system consists of three main components: a fall detection device, a central server, and a mobile application. The fall detection algorithm runs in real time on a Raspberry Pi 4B board and combines classical methods with deep learning techniques. Specifically, an SVM model is employed in the classical stage, while Convolutional Neural Networks (CNN) and MoveNet models are utilized in the deep learning stage to enhance accuracy. To ensure security and privacy, the system incorporates end-to-end encryption and secure HTTPS-based...
Graph Learning from Incomplete Graph Signals
, M.Sc. Thesis Sharif University of Technology ; Babaiezadeh, Massoud (Supervisor)
Abstract
Graph learning problem aims to infer a meaningful graph structure from a dataset that can effectively represent the relationships among its data points. With the emergence of graph signal processing, efficient methods for graph learning have been introduced, which leverage the smoothness assumption of signals to learn the underlying graph. However, these methods typically require access to all data points, while in practical applications this is not always feasible. In this Master's Thesis, an optimization problem is proposed that simultaneously learns the underlying graph and estimates the missing data points from a dataset of graph signals. To solve the proposed optimization problem, a...
Improving CCA-Based methods for SSVEP classification using a common source graph
, Article Iranian Conference on Electrical Engineering, ICEE ; Issue 2024 , 2024 ; 21647054 (ISSN) ; Hajipour Sardouie, S ; Sharif University of Technology
IEEE
2024
Abstract
Steady State Visual Evoked Potential (SSVEP)-based Brain Computer Interfaces (BCIs) is one of the most prevalent methods in BCIs. The main purpose of these systems is to detect the frequency of SSVEP to understand which visual stimulus a person is looking at. Various methods have been proposed to detect the frequency of SSVEP. One of the most widely used methods is the Canonical Correlation Analysis (CCA) algorithm. Despite the simplicity and efficiency of the CCA algorithm, none of the methods based on CCA have incorporated the graph structure presented in the EEG and reference signals into the CCA cost function. In this paper, we introduce a novel approach that considers the graph...
Enhanced Internal Short Circuit Diagnosis of Lithium-Ion Batteries Using an Equivalent Circuit Model and Machine Learning algorithms
, Article 2024 9th International Conference on Technology and Energy Management, ICTEM 2024 ; 2024 ; 979-835032979-7 (ISBN) ; Moeini Aghtaie, M ; Sharif University of Technology
2024
Abstract
Diagnosing and detecting internal short circuits in lithium-ion batteries is a key issue to prevent thermal runaway failures and ensure overall safety. This study focuses on utilizing an Equivalent Circuit Model (ECM) and machine learning techniques to detect ISC faults in lithium-ion batteries. The impact of battery aging is considered by adjusting capacity and resistance values in the battery simulation. First, an ECM of a lithium-ion battery pack is developed in the MATLAB/SIMULINK platform, incorporating faulty and normal battery cells with varying aging levels. Subsequently, the output data from the simulated model is utilized as input for the Random Forest (RF) model under different...
Corporate-level technology strategy and its linkage with corporate strategy in multi-business companies: IKCO case study
, Article Technological Forecasting and Social Change ; Volume 122 , 2017 , Pages 243-252 ; 00401625 (ISSN) ; Khaleghi, M ; Noori, J ; Sharif University of Technology
2017
Abstract
This article deals with technology strategy and its linkage with overall strategy at multi-business, diversified groups. In the last two decades, the alignment of technology and business strategy has been one of the important research fields in strategy and technology management literature. These researches has been concentrated on single companies through which different frameworks, models, and decision support tools have been developed and widely utilized by industries. Although multi-business and diversified groups play an important role in national economy of developing countries and need a comprehensive and overall plan for the management of their diversified technological capabilities,...
Transmission of Analog Signals in Fading Channels using HARQ
,
M.Sc. Thesis
Sharif University of Technology
;
Hossein Khalaj, Babak
(Supervisor)
Abstract
In this dissertation we will study the problem of transmitting the information of continuous source over fading channel, especially when the transmitter does not have complete information about the channel status. In this situation we will have a tradeoff between the Quality of received packets and the Reliability in transmissions. To increase the quality of packets, for example, we should increase the quantization, and therefore, the transmission rates at the transmitter. But this will also increase the Error Probability at the receiver. It means that if the receiver gets the transmitted packet, it will have a better estimation of information source, but it is likely that error happens and...
Graph-Based Outlier Detection
, M.Sc. Thesis Sharif University of Technology ; Daneshgar, Amir (Supervisor)
Abstract
One of the most heatedly debated issues in Computer Science is Outlier Detection due to its vast and substantial applications such as credit cards, Image Processing,tax fraud detection, and medical approaches. Consequently, Outlier detection has been researched within various domains and knowledge disciplines. On the other hand, the research attempts have not been sufficient to overcome this critical problem considerably inasmuch as nearly all proposed techniques are associated with a special kind of applications or datasets.Firstly, this thesis attempts to provide a precise definition which not only excludes other one’s drawbacks, but also has its distinctive merits. Three essential...
Flow and Heat Transfer between Two Cylinders with Internal Rotation
, M.Sc. Thesis Sharif University of Technology ; Noori Boroujerdi, Ali (Supervisor)
Abstract
The objective of this project is numerical simulation of air flow and heat transfer between two horizontal concentric cylinders with rotation of inner cylinder and inertia of outer cylinder grooves on the inner cylinder. In this study, the air, meanwhile rotational motion by the inner cylinder will enter into the annular space between two cylinders with certain flow rate. It can be mentioned to cooling of power plant generators, Electric motors and rotating machines among usages of air flow between two cylinders. In this article the objective is calculation of pressure drop and Nusselt number, temperature distribution on the inner cylinder under conditions of constant temperature of...
Biological Regeneration of Used Activated Carbon
, M.Sc. Thesis Sharif University of Technology ; Borghei, Mehdi (Supervisor)
Abstract
Tehran Refinery, as an industrial center that has significant water consumption in Tehran, intends to use the flow of water from the treatment plant south of Tehran after final preparation, with the aim of managing water resources and meeting its needs. And it uses a biological activated carbon (BACF) filter to reduce the DOC concentration. In these filters, the removal of organic matter is performed by the adsorption process as well as the biodegradation process by microorganisms grown on activated carbon. The presence of biofilm leads to continuous bio-regeneration of activated carbon during the water treatment process. Therefore, in this study, by examining the performance of these...
An Empirical Study on the Use of Cross-Project Clones
,
M.Sc. Thesis
Sharif University of Technology
;
Heydar Noori, Abbas
(Supervisor)
Abstract
Code clones are similar code snippets in software projects. Code clones, along with their disadvantages and applications, have long been studied by researchers. In recent years, due to the popularity of open source software, using software development ecosystems such as GitHub have increased dramatically. These ecosystems allow their users to perform high-quality software development without the need for physical presence. A number of previous studies have shown that software is being developed or modified repeatedly and many defects in software projects are duplicates. Finding these recurring codes and defects may be useful for software developers. Given that finding and fixing software...
Fault Diagnosis of Lithium-ion Battery Pack of Electric Vehicles Using Machine Learning Algorithms
, M.Sc. Thesis Sharif University of Technology ; Moeini Aghtaei, Moein (Supervisor)
Abstract
In the current era, the urgent need to reduce the use of fossil fuels and limit carbon emissions has highlighted the importance of shifting from traditional gasoline-powered vehicles to electric vehicles. The evolving landscape and challenges in the field of electric vehicles highlight the importance of ensuring the safety and reliability of energy storage systems. Lithium-ion batteries play a central role in electric vehicle technology, requiring thorough research efforts. Notably, the detection of internal short circuit, a common issue in lithium-ion batteries, has become a focus of researchers in recent years. This study aims to investigate the internal short circuit fault in lithium-ion...
The linkage of technology strategy and overall strategy of multi business diversified groups: Literature review and theoritical framework
, Article PICMET '10 - Portland International Center for Management of Engineering and Technology, Proceedings - Technology Management for Global Economic Growth, 18 July 2010 through 22 July 2010, Phuket ; July , 2010 , Pages 22-33 ; 9781890843229 (ISBN) ; Khaleghi, M ; Noori, J ; Sharif University of Technology
2010
Abstract
This article deals with technology strategy and its linkage with overall strategy at multi-business, diversified groups. In the last two decades, the alignment of technology and business strategy has been one of the important research fields in strategy and technology management scopes. These researchs has been concentrated on single companies through which different frameworks, models & decision support tools have been developed and widely utilized by industries. Although multi-business and diversified groups play an important role in global and national economics and need a comprehensive and overall plan for the management of their diversified technological assets, there are few researchs...
A new double counting cancellation technique for three-dimensional ray launching method
, Article IEEE Antennas and Propagation Society International Symposium, APS 2006, Albuquerque, NM, 9 July 2006 through 14 July 2006 ; 2006 , Pages 2185-2188 ; 15223965 (ISSN) ; Shishegar, A. A ; Jedari, E ; Sharif University of Technology
2006