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    Minimisation of image watermarking side effects through subjective optimisation

    , Article IET Image Processing ; Volume 7, Issue 8 , 2013 , Pages 733-741 ; ISSN: 17519659 Golestani, H. B ; Ghanbari, M ; Sharif University of Technology
    2013
    Abstract
    This study investigates the use of structural similarity index (SSIM) on the minimised side effect to image watermarking. For the fast implementation and more compatibility with the standard discrete cosine transform (DCT)-based codecs, watermark insertion is carried out on the DCT coefficients and hence an SSIM model for DCT-based watermarking is developed. For faster implementation, the SSIM index is maximised over independent 4 × 4 non-overlapped blocks, but the disparity between the adjacent blocks reduces the overall image quality. This problem is resolved through optimisation of overlapped blocks, but, the higher image quality is achieved at a cost of high computational complexity. To... 

    Effect of electrical parameters on morphology, chemical composition, and photoactivity of the nano-porous titania layers synthesized by pulse-microarc oxidation

    , Article Electrochimica Acta ; Volume 55, Issue 8 , 2010 , Pages 2760-2766 ; 00134686 (ISSN) Bayati, M. R ; Moshfegh, A. Z ; Golestani Fard, F
    2010
    Abstract
    TiO2 layers were grown via pulse type microarc oxidation process under different applied voltages, frequencies, and duty cycles. Surface chemical composition and phase structure of the synthesized layers were studied utilizing X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). Furthermore, scanning electron microscope (SEM) and atomic force microscope (AFM) were employed to investigate surface morphology and topography of the layers. It was revealed that the layers had a porous structure with both anatase and rutile phases. The anatase relative content in the layers increased with the applied frequency; meanwhile, it decreased with duty cycle at low applied voltages, but... 

    Delay-Independent regulation of blood glucose for type-1 diabetes mellitus patients via an observer-based predictor feedback approach by considering quantization constraints

    , Article European Journal of Control ; Volume 63 , January , 2021 , Pages 240-252 ; 09473580 (ISSN) Golestani, F ; Tavazoei, M. S ; Sharif University of Technology
    Elsevier Ltd  2021
    Abstract
    Diabetes, as a widespread chronic disease, is caused by the increase of blood glucose concentration (BGC) due to pancreatic insulin production failure and/or insulin resistance in the body. The artificial pancreas (AP) known as a closed-loop insulin delivery control system consists of a glucose sensor for BGC measurement, a control algorithm for calculation of exogenous insulin delivery rate (IDR), and an insulin infusion pump. The AP provides a closed-loop glucose-insulin regulatory system for type-1 diabetes mellitus (T1DM) patients in order to effectively reduce the high BGC level. In this paper, we aim to design a controller in order to regulate the BGC of T1DM patients at its basal... 

    Event-based consensus control of Lipschitz nonlinear multi-agent systems with unknown input delay and quantization constraints

    , Article European Physical Journal: Special Topics ; Volume 231, Issue 22-23 , 2022 , Pages 3977-3985 ; 19516355 (ISSN) Golestani, F ; Tavazoei, M. S ; Sharif University of Technology
    Springer Science and Business Media Deutschland GmbH  2022
    Abstract
    This paper deals with an event-triggered protocol design for achieving global exponential consensus of Lipschitz nonlinear multi-agent systems (MASs) with unknown time-varying input delay and state quantization constraints. For such MASs, an event-triggered delay independent truncated predictor feedback (ET-DITPF) protocol is designed using the information of the upper bound of time-varying input delay (and not its exact value). A sufficient condition on the upper bound value of time-varying input delay is established under which the global consensus of the MASs in the presence of the state quantization constraints is achieved. Also, the avoidance of Zeno behavior is proved by finding a... 

    Delay-Independent regulation of blood glucose for type-1 diabetes mellitus patients via an observer-based predictor feedback approach by considering quantization constraints

    , Article European Journal of Control ; Volume 63 , 2022 , Pages 240-252 ; 09473580 (ISSN) Golestani, F ; Tavazoei, M. S ; Sharif University of Technology
    Elsevier Ltd  2022
    Abstract
    Diabetes, as a widespread chronic disease, is caused by the increase of blood glucose concentration (BGC) due to pancreatic insulin production failure and/or insulin resistance in the body. The artificial pancreas (AP) known as a closed-loop insulin delivery control system consists of a glucose sensor for BGC measurement, a control algorithm for calculation of exogenous insulin delivery rate (IDR), and an insulin infusion pump. The AP provides a closed-loop glucose-insulin regulatory system for type-1 diabetes mellitus (T1DM) patients in order to effectively reduce the high BGC level. In this paper, we aim to design a controller in order to regulate the BGC of T1DM patients at its basal... 

    Event-triggered delay-independent truncated predictor feedback stabilization of Lipschitz nonlinear input delay systems with state quantization

    , Article Proceedings of the Institution of Mechanical Engineers. Part I: Journal of Systems and Control Engineering ; Volume 237, Issue 6 , 2023 , Pages 1099-1110 ; 09596518 (ISSN) Golestani, F ; Tavazoei, M. S ; Sharif University of Technology
    SAGE Publications Ltd  2023
    Abstract
    This article addresses the event-triggered control design for stabilization of Lipschitz nonlinear systems with time-varying input delay and state quantization constraints. The stabilization is done by an event-triggered delay-independent truncated predictor feedback controller using the information of the upper bound of time-varying input delay (and not its exact value). A sufficient condition on the value of this upper bound in order to guarantee the stability of the closed-loop system under the state quantization constraints is derived. Also, the avoidance of Zeno behavior is proved by finding a lower bound for each two successive events. Various numerical examples illustrate the... 

    Event-triggered stabilization of linear input-delay systems with state quantization and unknown time-varying delay: A Razumikhin stability theorem-based approach

    , Article Transactions of the Institute of Measurement and Control ; Volume 45, Issue 10 , 2023 , Pages 1965-1974 ; 01423312 (ISSN) Golestani, F ; Tavazoei, M. S ; Sharif University of Technology
    SAGE Publications Ltd  2023
    Abstract
    Benefiting from the input-to-state stability (ISS) version of the Razumikhin stability theorem, this paper deals with the stabilization of continuous linear input-delay systems with state quantization and without any knowledge about the delay. An event-triggered delay independent truncated predictor feedback (ET-DITPF) controller with a switched feedback control law is proposed to guarantee the globally uniformly asymptotic stability (GUAS)/globally uniformly exponential stability (GUES) of the closed-loop system. As a prominent feature, this controller uses no information about the time delay (neither its value nor its upper bound). In the proposed event-triggered framework, a lower bound... 

    Improving Utility of Cellular Spectrum to Secondary Users

    , M.Sc. Thesis Sharif University of Technology Rasouli, Mohammad (Author) ; Golestani, Jamaloddin (Supervisor)
    Abstract
    This thesis investigates methods to improve the utility of cellular spectrum to secondary users. Here, secondary users exploit the spectrum by hierarchical spectrum access. Since the information of the channels is available at the central controller, cellular networks can play an active role in spectrum use of the secondary users and increase their utility in this way. Transmitting the information available at the central controller to the secondary users and ordering the channels in use by primaries can help improve spectrum sensing. First, we consider the schemes which maximize secondary users’ utility by ordering the channel allocation process to primary users. We model the secondary... 

    Cross-Layer Design Based on Inter-Session Network Coding

    , M.Sc. Thesis Sharif University of Technology Aminian, Gholamali (Author) ; Golestani, Jamaloddin (Supervisor)
    Abstract
    Network coding as an efficient approach for performance improvement of communication networks has been introduced by Ahlswede et al. Despite simple forwarding schemes, in network coding scenarios, intermediate nodes forward the encoded version of their received packets. In wireless Networks, resource allocation includes routing, network coding, flow control, scheduling and power control.In this dissertation a joint scheduling, routing, flow control and Inter-session NC formulation based on a convex optimization problem is studied. Our formulation integrates the optimal scheduling, flow control and Inter-session network coding with a modified version of minimum delay routing. We propose a way... 

    Deterministic and Pribabilistic Bounds on Traffic and Service and their Application on Network Performance Analysis

    , M.Sc. Thesis Sharif University of Technology Amiri, Ebrahim (Author) ; Golestani, Jamaloddin (Supervisor)
    Abstract
    In a data network, expressing an appropriate model for traffic and service is necessary for the guarantee of quality of service (QoS) parameters, e.g. delay and backlogged traffic. There are four main approaches for modeling the traffic and service. First approach is classic queuing theory. It is a useful tool for analyzing the networks with memory less input traffic. Second approach is deterministic network calculus. In this approach some deterministic bounds on delay and backlogged traffic can be derived. However, it is not accurate for analyzing the bursty traffic and wireless networks, because only trivial bounds can be derived in these scenarios. Third approach is effective bandwidth... 

    Wireless LAN Scheduling for Achieving Multiuser Diversity and QoS

    , M.Sc. Thesis Sharif University of Technology Marzi, Zhinus (Author) ; Golestani, Jamaloddin (Supervisor)
    Abstract
    Increasing demand for higher data rates and more reliable communications along with growing applications of multimedia networks in everyday life on one hand, and limited resources on the other, have given rise to researches investigating spectrum efficiency enhancement techniques, among which multiuser diversity has always been of considerable importance. This thesis is a study on utilization of multiuser diversity in wireless LANs via scheduling. Where throughput and Quality of Service (QoS) in communication networks are being investigated, it is mostly advantageous to describe the traffic behavior of resources by greedy or non-greedy models. So far, there are plenty of investigations on... 

    Design of Adaptive Interleaver in Wireless Communication

    , M.Sc. Thesis Sharif University of Technology Alidadi, Afsoon (Author) ; Golestani, Jamaloddin (Supervisor)
    Abstract
    Generally to deal with errors in communication systems, two methods have been proposed: FEC and ARQ. In FEC, redundancy bits are added to the data that causes detection and correction of certain error patterns. ARQ method is based on retransmission of information if there is an error in the information. Another method, which is called Hybrid-ARQ, is the combination of these two methods; there are two types of TypeI and TypeII for this category. In typeI, number of redundancy bits in consecutive transmissions of one codeword is constant but in typeII, number of redundancy bits of a codeword increases in subsequent retransmissions.
    To deal with burst errors, we can use interleaving along... 

    Designing a Distributed Fair Scheduling Algorithm in a Wireless Medium

    , M.Sc. Thesis Sharif University of Technology Raeis, Majid (Author) ; Golestani, Jamaloddin (Supervisor)
    Abstract
    Fair allocation of bandwidth between stations of a shared medium, is an important and challenging problem. It is even more challenging when there is no coordinator to arbitrate access to the medium and therefore, a distributed algorithm is needed to provide fairness. IEEE 802.11 DCF is the dominant distributed medium access control (MAC) protocol in a wireless LAN. However, DCF is not in general fair and suffers from short-term unfairness. In addition to that, it is desired to provide differentiated service for the stations of a LAN based on their demands. Since priority based protocols may lead to starvation of the low priority traffic, we are more interested in fair queuing. On the other... 

    Management and Efficient Allocation of Resources in Competitive Networks

    , Ph.D. Dissertation Sharif University of Technology Farhadi, Farzaneh (Author) ; Golestani, Jamaloddin (Supervisor)
    Abstract
    In contrast to traditional Networks where a designer can specify an action plan for each agent, in a network with strategic agents, every agent acts selfishly and chooses his strategy privately so as to maximize his own objective. In this dissertation, we study problems arising in the design of static and dynamic networks with strategic agents. We consider two classes of design problems. In the first class, the designer utilizes her control over decisions and resources in the system to incentivize the agents via monetary incentive mechanisms to reveal their private information that is crucial for the efficient operation of the system. In this class of problems, we address two main challenges... 

    Evaluation of the optimal performance of passenger vehicle by integrated energy-environment-economic modeling

    , Article International Journal of Environmental Science and Technology ; Volume 4, Issue 2 , 2007 , Pages 189-196 ; 17351472 (ISSN) Farzaneh, H ; Saboohi, Y ; Sharif University of Technology
    CEERS  2007
    Abstract
    Analysis of multi dimensional interactions of flow of energy in passenger vehicle is a complex task that necessitates development and utilization of analytical tools. Development of analytical tools with high complexity is usually based on conclusions of many concepts and theories from different scientific disciplines. In this approach, Passenger vehicle is supposed to be organized in the form of a firm and appears in the market that oriented towards establishing an effective energy supply system which may be identified as delivering the product (person kilometer or tone kilometer) with minimum operation costs. To this end, an optimization model named power software founded on theory of firm... 

    Model for analysis of energy flow from tank-to-wheel in a passenger vehicle

    , Article 2005 IEEE Vehicle Power and Propulsion Conference, VPPC, Chicago, IL, 7 September 2005 through 9 September 2005 ; Volume 2005 , 2005 , Pages 150-153 ; 0780392809 (ISBN); 9780780392809 (ISBN) Farzaneh, H ; Saboohi, Y ; Sharif University of Technology
    2005
    Abstract
    Analysis of multi dimensional interactions of flow of energy in passenger vehicle is a complex task that necessitates development and utilization of analytical tools. Development of analytical tools with high complexity is usually based on conclusions of many concepts and theories from different scientific disciplines. In this approach, Passenger vehicle is supposed to be organized in the form of a firm and appears in the market that oriented towards establishing an effective energy supply system which may be identified as delivering the product (person per mileage removable) with minimum operation costs. To this end, an optimization model named POWER software founded on theory of firm of... 

    Software of passenger vehicle optimal work and energy recovery (POWER)

    , Article 12th International Conference on Urban Transport and the Environment in the 21st Century, URBAN TRANSPORT 2006, UT06, Prague, 12 July 2006 through 14 July 2006 ; Volume 89 , 2006 , Pages 691-699 ; 17433509 (ISSN); 1845641795 (ISBN); 9781845641795 (ISBN) Farzaneh, H ; Saboohi, Y ; Sharif University of Technology
    2006
    Abstract
    In our investigation, the model of optimal energy flow in a passenger vehicle has been founded on the theory of firm microeconomics. Based on this theory, the car owner tries to minimize the total cost of the system (including the cost of time of the traveller) subject to the satisfaction of the required transport services and technological, economical, environmental and institutional constraints. The aforementioned model has been developed using a technique of mathematical programming. The model depicts the behaviour of a nonlinear system and it includes many nonlinear functions in the objective function and in the constraints. Solving the large nonlinear set of constraints and identifying... 

    Radiowave Propagation Modeling Along a Street for Use in Microcells in Third Generation Wireless Communications

    , M.Sc. Thesis Sharif University of Technology Sadeghi, Hamed (Author) ; Farzaneh, Forouhar (Supervisor)
    Abstract
    In this thesis, a simplified method was introduced to model the wave scattering by the metallic objects in a microcell, in order to determine the coverage pattern. First, the equivalent images method was introduced, which models the building walls effect. This method is fast, memory saving and accurate enough to estimate the scattered fields. Two-ray incidence model accuracy was investigated and confirmed in modeling the scattering from the metallic objects. This method also enhances saving in time and memory. The accuracy of single scattering assumption was investigated and confirmed in a scenario of multiple metallic scatterers. Based on this assumption, we can superimpose the scattered... 

    Design and Simulation of Smart Patch Antenna Array in 2.4 GHz band

    , M.Sc. Thesis Sharif University of Technology Hosseini, Mahdi (Author) ; Farzaneh, Forouhar (Supervisor)
    Abstract
    Over the past few years , demand for wireless communication services have grown at a formidable rate. As such we need to find new ways to support more and more wireless users in a confined space. this means that the capacity of networks should be significantly increased to overcome formidable rate of subscribers growth. That is why the smart antennas have become very popular in communication systems. Smart antennas are a kind of adaptive antenna arrays with smart signal processing algorithms used to find direction of arrival(DOA) of the signal, and use it to calculate suitable weights to direct the antenna beam on the desired user and nulling interferences. In this thesis, DOA estimation... 

    Evaluation of Phase Comparison DOA Estimation Methods in Multipath Environments for Millimeter Waves

    , M.Sc. Thesis Sharif University of Technology Karimi, Parisa (Author) ; Farzaneh, Forouhar (Supervisor)
    Abstract
    The main objective of this project is to discuss a DOA estimation system performance in a multipath environment. For this goal, first the basics of the DOA Estimation systems are discussed. Evaluation of different types of algorithms and choosing an appropriate one is an important step in this regard. Moreover the comparison of different array structures is necessary to choose the appropriate one. The major part of the project has been dedicated to discussion of multipath phenomenon as a major source of error in DOA estimation and studying the multipath mitigation algorithms to eliminate the aforementioned error. A model based on the concept of Bistatic Radar Cross Section is proposed to...