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    Dynamic Characteristics Analysis of Drill-String in Deviated Oil Well

    , M.Sc. Thesis Sharif University of Technology Zoveidanian, Soheil (Author) ; Ghaemi Osgouie, Kambiz (Supervisor) ; Salarieh, Hassan (Co-Advisor)
    Oil field industry is one of the most challenging engineering subjects. In oil well drilling, undesired motion could raise a lot of problems such as stuck pipes; wash out pipe, and etc. In this industry, motion prediction is very important because a good prediction can avoid instruments failure and as a result considerable amount of time could be saved. Predicting dynamic characteristics of drill-string such as whirl orbit, whirl speed, and axial, lateral, and torsional displacements, accelerations, and velocities, might be useful in avoiding or decreasing failures. A program based on FEM (Finite Element Method) is developed in MATLAB considering deviation of drill-string, contacting with... 

    Implementation and Comparison of Some Steganography Method for Digital Images

    , M.Sc. Thesis Sharif University of Technology Chaboki, Behrang (Author) ; Mahdavi Amiri, Nezameddin (Supervisor)
    In the modern world, steganography is an image processing technique, revealing to be a suitable process for information hiding. In most cases, steganography has shown to be more effective than cryptography techniques. Recently, there have been attempts to improve the stego-image quality and hiding capacity by introducing new methods. Here, we inspect the advantages and disadvantages of some new steganography methods for digital images. The implemented methods are color and grayscale image steganography with OPVSP algorithm, BRL and GRL methods, and the simple LSB method with OPAP algorithm. Here, we compare the implementation results of these methods using MATLAB 7.4.0, with other common... 

    Designing, modeling and wrench feasible workspace analysis of a 3D cable suspended robot for heavy loads handling applications

    , Article 39th International Symposium on Robotics, ISR 2008, Seoul, 15 October 2008 through 17 October 2008 ; 2008 , Pages 934-939 Hamedi, J ; Zohoor, H ; Sharif University of Technology
    The objective of this paper is designing, modeling and wrench feasible workspace analysis of a 3D cable suspended robot as IRPM (Incompletely Restrained Positioning Mechanism). This type of robots supports a load platform in space by less than or equal to six spatially arranged cables. We use the model of 6 cables spanned in the same manner as a Stewart parallel mechanism. This mechanism is suitable for the accurate positioning of heavy loads. Concentrating on the operations of heavy loads handling, studying the workspace and ways of increasing it is of high importance. Several workspaces exist amongst which the constant and total orientation statically reachable combined and wrench feasible... 

    Determination of installation capacity in reservoir hydro-power plants considering technical, economical and reliability indices

    , Article International Journal of Electrical Power and Energy Systems ; Volume 30, Issue 6-7 , 2008 , Pages 393-402 ; 01420615 (ISSN) Hosseini, S. M. H ; Forouzbakhsh, F ; Fotouhi, M ; Vakilian, M ; Sharif University of Technology
    One of the most important issues in planning the "reservoir" type of hydro-power plants (HPP) is to determine the installation capacity of the HPPs and estimate its annual energy value. In this paper, a method is presented. A computer program has been developed to analyze energy calculation and estimation of the most important economic indices of an HPP using the sensitivity analysis method. Another program, developed by Matlab software, calculates the reliability indices for a number of units of an HPP with a specified load duration curve using the Monte Carlo method. Ultimately, comparing the technical, economic and reliability indices will determine the installation capacity of an HPP. By... 

    Design and Implementation of an Audio Steganography System on FPGA

    , M.Sc. Thesis Sharif University of Technology Ebrahimabadi, Mohammad (Author) ; Tabandeh, Mahmood (Supervisor)
    In recent years, along with development of technology and decrease in size of digital devices, copying and editing of digital multimedia products has become easier. Also, broadband technology caused simpler distribution of data. Considering above mentioned problems, we can use watermarking. Nowadays, watermarking has many applications such as secure transmission of data, owner identification, proof of ownership, authentication, broadcast monitoring etc. Watermarking is the process of hiding information in a secure host, in a way that it does not change the quality of signal. Watermarking is the science and art of hiding secret information in which neither the sender nor the receiver would... 

    Kinetic Modeling of Glycerol Aqueous Phase Reforming Process

    , M.Sc. Thesis Sharif University of Technology Nayernia, Zahra (Author) ; Kazemeini, Mohammad (Supervisor)
    Dwindling fossil fuel reserves with attendant rising crude oil price and the relatively rapid growth in global population have made the search for sustainable energy supply more imperative. Among the various renewable resources, biomass has attract much more attention. Glycerol as the major by-product of the biodiesel production process, can be converted to hydrogen. One of the methods for converting glycerol to hydrogen is aqueous phase reforming (APR). In the current research, glycerol aqueous phase reforming is modeled and then simulated with MATLAB software. The reactor diameter is 5 mm and its length is 20 cm and reactor operated at 250℃ and 50 bar. Glycerol conversion obtained is... 

    Multipath effect on false peaks in covariance based MIMO radar beampattern design

    , Article Proceedings International Radar Symposium, Dresden ; Volume 2 , June , 2013 , Pages 970-975 ; 21555753 (ISSN) ; 9783954042234 (ISBN) Roshanzamir, A ; Bastani, M. H ; Sharif University of Technology
    In a Multiple Input Multiple Output (MIMO) radar unlike conventional phased array radar, we can choose freely between the probing signals transmitted via its antennas to maximize the transmitted power around specific target locations or to approximate a desire beam-pattern in different manners that many papers have taken into consideration so far. In an operational radar or communication environment, one of the usual phenomenon that happens is multipath. In this paper we'd like to take this effect into consideration and show that how this effect can influence our beam-pattern in a covariance based MIMO radar beam-forming. We will show that multipath can change beam-pattern peak direction,... 

    Analysing of 3D beamforming in MIMO radars

    , Article Proceedings of the 2012 World Congress on Information and Communication Technologies, WICT 2012 ; 2012 , Pages 745-749 ; 9781467348041 (ISBN) Roshanzamir, A ; Bastani, M. H ; Roshanzamir, M ; Machine Intelligence Research Labs (MIR Labs) ; Sharif University of Technology
    A multiple input multiple output (MIMO) radar system is an emerging research field which has attracted many studies in recent years. This type of radar, unlike conventional phased array radar, can transmit different probing signals via its antennas, that may be correlated or uncorrelated with each other. This waveform diversity offered by MIMO radar systems enable superior capabilities compared to conventional phased array radar. Many papers have introduced different ways for beamforming of MIMO radar. In this paper it is desirable to analysis some methods for beamforming of MIMO radars with planar arrays constellation and examine their 3D result beam-pattern of such constellations for... 

    Analysing of binary PAM systems in digital communication

    , Article International Conference on Communication Technology Proceedings, ICCT ; 2012 , Pages 1240-1246 ; 9781467321013 (ISBN) Roshanzamir, A ; Bastani, M. H ; Sharif University of Technology
    In this era of digital communication systems, different factors are included in efficiency of a transceiver system. Binary PAM systems are one of these transceiver systems. Many aspects of such a system has been considered yet but this field needs more research on because this is the base of any communication system. In this paper, effects of transmitter and receiver filters, noise, duty-cycle and time mismatch between transmitter and receiver in a binary baseband PAM transceiver system is analyzed. Simulation is performed to analyze the above effects on a typical communication system with 10 bits of transmit. MATLAB software is being employed for simulations  

    Force controlled manipulation of biological cells using a monolithic MEMS based nano-micro gripper

    , Article ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) ; Volume 2 , 2012 , Pages 193-201 ; 9780791845189 (ISBN) Abbasi, A. A ; Ahmadian, M. T ; Sharif University of Technology
    Nano-micro grippers are able to pick-transport-place the micro or nanometer -sized materials, such as manipulation of biological cells or DNA molecules in a liquid medium. This paper proposes a novel monolithic nano-micro gripper structure with two axis piezoresistive force sensor which its resolution is under nanoNewton. The results of the study have been obtained by the simulation of the proposed gripper structure in Matlab software. Motion of the gripper arm is produced by a voice coil actuator. The behavior of the cell has been derived using the assumptions in the literatures. Moreover, two simple PID controllers, one for control of the gripper motion and another for control of the force... 

    Utilizing a simulation approach for analysis of patient flow in the emergency department: a case study

    , Article 15th Iran International Industrial Engineering Conference, IIIEC 2019, 23 January 2019 through 24 January 2019 ; 2019 , Pages 151-157 ; 9781728117751 (ISBN) Seyed Ghafouri, S. M. M ; Haji, B ; Shakhsi Niaei M ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2019
    Simulation has been shown to be one of the most powerful tools in many areas of the health-care system, a system which attracted the attention of researchers due to its intricacy. The main goal of this study is to evaluate the patients' flow in an emergency department (ED). Discrete event simulation (DES)has been used as the core of this research so that it offers various ways to reduce the length of stay (LOS)of patients in different segments of ED by assessing various scenarios. In particular, a new approach for verification of the simulated model will be discussed. This study reports on the results that extracted from a case study on patient record data in one of the EDs located in Tehran... 

    From passive dynamic walking to ankle push-off actuation: An MSC ADAMS approach to design

    , Article 6th RSI International Conference on Robotics and Mechatronics, IcRoM 2018, 23 October 2018 through 25 October 2018 ; 2019 , Pages 400-405 ; 9781728101279 (ISBN) Mizani, A ; Ehteshami Bejnordi, V ; Tehrani Safa, A ; Naraghi, M ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2019
    The main focus of this paper is on how the biped robot has a stable passive gait cycle as well as going through a stable journey on a level ground merely with push-off actuation. During recent years humanoids have been in the center of attention due to several reasons some of which are: compactness of the structure, low energy consumption, humanoid behavior and last but not least being of great use in medical field. In this paper, equations of motion regarding the passive phase as well as push-off are simulated in MATLAB software. For the next step, a comparison between these two stable gait cycles is made so as to figure out the difference between energy injected to the system by push-off... 

    Demand response programs maximum participation aiming to reduce negative effects on distribution networks

    , Article International Transactions on Electrical Energy Systems ; Volume 30, Issue 8 , 2020 Hassanniakheibari, M ; Hosseini, S. H ; Soleymani, S ; Sharif University of Technology
    John Wiley and Sons Ltd  2020
    Distribution companies attempt to present better services, while reducing investment costs, by promoting consumers' participation in demand response programs. They increase the rate of consumers' participation in demand response programs by taking advantage of reward and punishment policies. Increasing consumers' participation in demand response programs is justifiable when it does not have negative impacts on network technical parameters nor decrease the electricity sale rate. Therefore, it seems necessary to determine the maximum level of consumers' optimal participation in implementation of demand response programs. In this article, a new model is presented based on distribution... 

    Using genetic alghoritm for distributed generation allocation to reduce losses and improve voltage profile

    , Article 42nd International Universities Power Engineering Conference, UPEC 2007, Brighton, 4 September 2007 through 6 September 2007 ; 2007 , Pages 954-959 ; 1905593368 (ISBN); 9781905593361 (ISBN) Alinejad Beromi, Y ; Sedighizadeh, M ; Bayat, M. R ; Khodayar, M. E ; Sharif University of Technology
    This paper presents a method for the optimal allocation of Distributed generation in distribution systems. In this paper, our aim would be optimal distributed generation allocation for voltage profile improvement and loss reduction in distribution network. Genetic Algorithm (GA) was used as the solving tool, which referring two determined aim; the problem is defined and objective function is introduced. Considering to fitness values sensitivity in genetic algorithm process, there is needed to apply load flow for decision-making. Load flow algorithm is combined appropriately with GA, till access to acceptable results of this operation. We used MATPOWER package for load flow algorithm and... 

    Aerothermodynamically Re-Design of an Air-Cool Heat Exchanger Fin Configuration Utilized for Cooling the Lubricating Oil of a Gas Turbine Unit Benefiting from Numerical Simulation

    , M.Sc. Thesis Sharif University of Technology Kargarian, Abbas (Author) ; Darbandi, Masoud (Co-Advisor)
    The lubricating oil is commonly used to cool down the moving parts of turbine gas systems. In many applications, this oil is cooled down using a recirculating water circuit. The water is then cooled down using an air-cooled heat exchanger. Any deficiency in aerothermodynamic design of such heat exchanger would result in high temperature of gas turbine moving parts such as bearings. Obviously, this mal-performance has adverse effect on the lifetime of these parts and their maintanence aspects. Since the good performance of air-cooled heat exchanger has numerous advantages for the performance of related gas turbine unit, it is mandatory to design these heat exchangers in minimum sizes and... 

    Modeling and Simulation of 12-DOF Parafoil-Payload System Flight Dynamics

    , M.Sc. Thesis Sharif University of Technology Torabinejad, Meghdad (Author) ; Saghafi, Fariborz (Supervisor)
    This thesis is concerned with the modeling and simulation of twelve degrees of freedom parafoil-payload system, as a multibody aircraft configuration. This 12-DOF dynamic model represents three degrees of freedom each for rotational motion of the parafoil (including suspension lines and canopy) and payload, and three degrees of freedom for translational motion of the parafoil, and one degree of freedom for relative translational motion of the payload, also two degrees of freedom for rotation of the canopy frame respect to the parafoil frame.
    For evaluation of the flight dynamic behavior of parafoil-payload system, the nonlinear differential equations of the system have been derived and... 

    Predictive Equations for Shear Link Modeling Toward Collapse

    , M.Sc. Thesis Sharif University of Technology Moammer, Omid (Author) ; Mohtasham Dolatshahi, Kiarash (Supervisor)
    In this paper the predictive equations for collapse assessment of shear links used in eccentric braced frames are developed. An extensive database including results of over 70 cyclic tests on steel wide flange shear links is collected and the structural parameters governing the hysteresis behavior are calibrated using a simplified numerical model. The methodology of calibration is to minimize the discrepancy between the experimental hysteresis loops and the corresponding numerical results using Particle Swarm Optimization (PSO) algorithm. The objective function of PSO algorithm is minimized by iterating parameters that govern the hysteresis behavior of the numerical model. Stepwise... 

    Dynamic Modeling of Ship Motion in Acceleration Maneuver

    , M.Sc. Thesis Sharif University of Technology Mahmoodi, Hamid Reza (Author) ; Seif, Mohammad Saeed (Supervisor)
    The study of maneuverability is very important in ship design. In the early stages of design, ship maneuvering is predicted with the help of mathematical models. The mathematical models used to simulate the maneuverability are relatively fast, but in this method, it is not possible to examine the exact details of the flow and the interaction between the hull and the propeller and rudder. Studying ship maneuvers in an experimental method is very accurate but also involves high costs. In recent years, with the advancement of technology, the use of computers and numerical methods has led to a good and accurate prediction of the ship's behavior during maneuverability. In this study, acceleration... 

    Core-scale Mechanistic Simulation of Engineered Salinity Waterflooding Using Bond-Product-Sum Method

    , M.Sc. Thesis Sharif University of Technology Almasian, Pourya (Author) ; Mahani, Hassan (Supervisor)
    Considering the world's diminishing oil reserves, as well as the growing demand for oil and energy consumption, Enhanced Oil Recovery (EOR) techniques are becoming increasingly important in the attempt to improve oil production. Engineering salinity waterflooding has gained widespread attention and popularity in the last two decades due to its environmental friendliness, lack of expensive additives, low operating costs, and ease of use as an oil extraction process. The goal of this study is to use an innovative method to develop a mechanistic approach model that simulates and forecasts the mechanism and performance of the engineered water flooding process. Wettability alteration, the most... 

    Neuro-fuzzy islanding detection in distributed generation

    , Article 2012 IEEE Innovative Smart Grid Technologies - Asia, ISGT Asia 2012, 21 May 2012 through 24 May 2012 ; May , 2012 ; 9781467312219 (ISBN) Bitaraf, H ; Sheikholeslamzadeh, M ; Ranjbar, A. M ; Mozafari, B ; Sharif University of Technology
    Islanding detection methods are divided into three main groups as remote, active and passive. Although passive schemes have larger Non Detection Zones (NDZ) relative to other schemes, they are more used in utilities due to their low costs and less PQ problems than other schemes. Passive Schemes are based on the measurements of passive system parameters. These parameters are measured at the point of common coupling (PCC). A new approach in passive techniques is the use of data-mining to classify the system parameters. In this paper, massive indices are collected by simulation of a practical distribution system in PSCAD/EMTP environment. These indices include voltage, frequency, current,...