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    Control a Double Inverted Pendulum Using Active Learning Method

    , M.Sc. Thesis Sharif University of Technology Ghomi Rostami, Mohammad (Author) ; Bagheri Shouraki, Saeid (Supervisor)
    Abstract
    There are lots of researches performed to investigate human being learning and try to model it. But, in case of huge complexity of its structure and function, almost none of so-far learning algorithms can model human learning process and, indeed, performance of human brain in real problems is much more than these algorithms. Moreover, in many cases, human is not aware or informed about internal structure or mathematical model of the present system he is working on; a child learning to walk has no information about his neuromuscular system and his brain slowly learns how to convey his little body by choosing the proper timing of muscle contractions. One of the accomplished researches in order... 

    Control of a non observable double inverted pendulum using a novel active learning method based state estimator

    , Article Proceedings - UKSim 4th European Modelling Symposium on Computer Modelling and Simulation, EMS2010, 17 November 2010 through 19 November 2010 ; 2010 , Pages 21-26 ; 9780769543086 (ISBN) Ghatre Samani, A ; Bagheri Shouraki, S ; Eghbali, R ; Ghomi Rostami, M ; Sharif University of Technology
    2010
    Abstract
    In this paper a novel fuzzy approach exploiting Active Learning Method is employed in order to estimate the immeasurable states required to control a non-observable double inverted pendulum. Active Learning Method (ALM) is a fuzzy modeling method which exploits Ink Drop Spread (IDS) as its main engine. IDS is a universal fuzzy modeling technique which is very similar to the way human brain processes different phenomena. The ALM system is trained by the data obtained from Linear Quadratic Regulator (LQR) controller. LQR uses an optimal control approach which under certain conditions guarantees robustness. Instead of an expert's knowledge, the LQR controller output is used as a priori... 

    Determination of Loading and Unloading Program in a Cross-Docking System

    , M.Sc. Thesis Sharif University of Technology Mohammadi Ghomi, Sahar (Author) ; Akbari Jokar, Mohammad Reza (Supervisor)
    Abstract
    Using the cross docking is a strategy that plays inventory coordinating role in the supply chain. At the cross docking, products of inbound trucks are unloaded, sorted, moved and loaded onto outbound trucks for delivery to different destinations. In this concept, coordination between inbound and outbound trucks considering a cross-dock system with multiple receiving and shipping dock doors. Moreover, due to justifiability of all trucks to carry multiple product types, product assignment from inbound trucks to outbound trucks is determined simultaneous to scheduling. As an exact solution approach a MIP model is presented and since the problem is shown to be NP-hard, it can only be used to... 

    Stability Analysis of Taloun Exploratory Tunnel with Application of Back Analysis Technique and Considering Interaction Between Three Parallels Taloun Tunnels by Three Dimensional Modeling

    , M.Sc. Thesis Sharif University of Technology Rostami, Ali (Author) ; Sedghiani, Mohammad Hossein (Supervisor)
    Abstract
    The main purpose of this research is to investigate geotechnical parameters of surrounding rock mass of Taloun tunnels (Tehran-Shomal freeway, Iran), with application of back analysis technique and consideration of monitoring data, in order to analyzing stability of tunnel at particular monitoring station 10 (NPI10). First, the geo mechanical parameters were investigated by sensitivity analysis preceded back analysis due to determine significant geotechnical parameters of rock mass contributed to tunnel excavation with respect of displacement and stress level. Following this section sensitivity analysis of different parameters were conducted. In this section it has been found that, the most... 

    Fabrication of Dye-Sensitized Solar Cells Based on TiO2-ZnO Double Layer Nanostructured Film

    , M.Sc. Thesis Sharif University of Technology Rostami, Parand (Author) ; Mohammadi, Mohammad Reza (Supervisor)
    Abstract
    In the present work, one dimensional ZnO nanostructures were grown by seed-assisted hydrothermal method. Hydrothermal processing parameters were controlled to obtain ZnO nanorods with diameter lower than 120 nm. The products were characterized by FE-SEM, EDAX, XRD, PL, and ATR-FTIR analyses. ZnO nanoparticles were also synthesized via a simple solvothermal method and their photo peropeties were compared with onedimensional nanostructures. Thereafter dye-sensitized solar cells based on TiO2-ZnO double layer nanostructured film were fabricated. It was observed that DSSC efficiency increased with decreasing the thickness of the film. The highest efficiency of 2.41% was obtained  

    Determination of Diffusion Coefficients of the Multi-components Gas-crude Oil Systems Considering Oil Swelling Effects at High Pressure High Temperature Conditions

    , M.Sc. Thesis Sharif University of Technology Rostami, Keyvan (Author) ; Ghazanfari, Mohammad Hossein (Supervisor)
    Abstract
    gas injection method is one of the common methods of EOR, which has a long history. In gas injection, molecular entry gas mixing is the controlling factor of oil play. Therefore, the exact value of this coefficient becomes an important requirement for the simulation and modeling of oil reservoirs, which can only be determined by laboratory consumption methods. In this research, the pressure decay method is used as a common laboratory method to determine the penetration coefficient of methane, nitrogen and gas enriched with intermediate compounds in crude oil of one of Iran's oil reservoirs. In most of the available records in the investigation of the mentioned gas diffusion coefficient in... 

    Effect of Natural Ligands on Transport of Radionuclides in Soil Column of Naeen Repository

    , M.Sc. Thesis Sharif University of Technology Rostami Kamalabad, Mohammad (Author) ; Samadfam, Mohammad (Supervisor)
    Abstract
    Nuclear waste management in Iran is the responsibility of the Nuclear Waste Company. The waste company is obliged to bury waste with a certain level of radioactivity, resulting from various processes of the nuclear fuel cycle or other processes such as research projects and medical centers, after the necessary measures, finally at the Anarak landfill site. To evaluate the safety of the site, it is necessary to study the parameters of radioactive nucleation in the soil. Humic substances from natural substances in the soil affect the transport of radioactive nuclei. In this project, to study the effects of the presence of humic acid, the soil of Anarak residue in three weight percent... 

    ZnO Coating, Containing SiO2 Nano Particles, Prepared by Sol-gel Process and Investigation of Surface Properties

    , M.Sc. Thesis Sharif University of Technology Rostami, Rahman (Author) ; Ghorbani, Mohammad (Supervisor) ; Askari, Masoud (Co-Advisor)
    Abstract
    Zinc oxide thin films due to special specification and properties have variable application in different industries. Recently because of wide application of zinc oxide doped SiO2 in optoelectronics and sensors, lots of investigation have been focus on it. Meanwhile due to the SiO2 hydrophilic properties, doping of ZnO with SiO2 can improve self-cleaning properties zinc oxide membrane.It this project zinc oxide and ZnO doped SiO2 thin films with different composition were made by sol-gel and dip-coating process used for coating of mentioned sol over the quartz surface(15*25 mm). At first point different sol with different components was mixed with each other to make composite films but due to... 

    Numerical Analysis of Channel Flow over an Elastic Bump, Using Lattice Boltzmann Method- A Biological Application

    , M.Sc. Thesis Sharif University of Technology Rostami Gandomani, Saeed (Author) ; Taeibi Rahni, Mohammad (Supervisor)
    Abstract
    In recent years, lattice Boltzmann method (LBM) has been developed to be used as an alternative and promising computational technique to simulate various flows. It originates from classical statistical physics. The ability to simply solve complex flows, simulating of multiphase and multi-component without need to follow the boundaries of different phases, and the inherent ability of parallel processing are notable features of this approach. On the other hand, finite element method (FEM) is widely used in many practical engineering fields, especially in solid mechanics. In this study, in addition to simulating flow over a rigid body, flow over an elastic body is also simulated with a... 

    CTC Cluster Separation on Microfluidics Chip

    , M.Sc. Thesis Sharif University of Technology Rostami, Peyman (Author) ; Firouzabadi, Bahar (Supervisor) ; Saidi, Mohammad Said (Supervisor)
    Abstract
    According to statistics in 2012, around 14 million people worldwide have cancer, and 8 million have died that year, according to estimates, this number will increase to 21 millions new cancer case and 13 million mortality in 2030. Despite years of research on cancer, many questions about the mechanism of the spread of cancer in the body remain unanswered so far. The proposed models identify that the cells isolated from the primary tumor and transmit them to the circulatory system in the form of circulating tumor cells (CTCs) or in the form of clusters as responsible for the incidence of cancer. This process is called metastasis. Recent studies have reported the high potential of metastasis... 

    Experimental Study and Modeling of Scale up in Multi-blocks Fractured Porous Media

    , M.Sc. Thesis Sharif University of Technology Mohammadi, Mohammad (Author) ; Ghazanfari, Mohammad Hossein (Supervisor) ; Rostami, Behzad (Supervisor)
    Abstract
    Fractured reservoirs constitute a major portion of world’s petroleum reservoirs. Gravity drainage is the controlling production mechanism in these reservoirs. Thus, investigation of performance and oil production in fractured models has been the subject of many researches. Despite the considerable number of experimental and modeling studies in this area, the method of scale-up in single or multi block models is not broadly investigated. This work is divided into two experimental and modeling sections. For the experimental study, free fall gravity drainage experiments in synthetic single or multi block porous media were performed in order to investigate effects of different parameters... 

    Evaluating the Effect of Innovation on Burden of Disease in Different Countries

    , M.Sc. Thesis Sharif University of Technology Rostami, Saleh (Author) ; Miremadi, Iman (Supervisor) ; Saleh Farazi, Mohammad (Co-Supervisor)
    Abstract
    In this comprehensive study, we explore the influence of general health innovation outputs on the burden of diseases across 70 nations spanning two decades, from 2000 to 2019, marking the first investigation of its kind. Our investigation takes into account associations among health-related patents, scholarly publications pertaining to health, and disability-adjusted life years (DALYs), a measure used to assess overall disease burden. Employing a robust fixed effect panel data model, our findings illuminate the notable impact health-related publications exert in mitigating disease burden universally across all countries examined. However, we did not find a similar association between patent... 

    NMR based metabonomics study on celiac disease in the blood serum

    , Article Gastroenterology and Hepatology from Bed to Bench ; Volume 6, Issue 4 , 2013 , Pages 190-194 ; 20082258 (ISSN) Fathi, F ; Ektefa, F ; Arefi Oskouie, A ; Rostami, K ; Rezaei Tavirani, M ; Mohammad Alizadeh, A. H ; Tafazzoli, M ; Rostami Nejad, M ; Sharif University of Technology
    2013
    Abstract
    Aim: The aim of this study is to look for the proper methods that would be a major step towards untreated CD diagnosis and seek the metabolic biomarkers causes of CD and compare them to control group. Background: Celiac disease (CD) is a common autoimmune disorder that is not easily diagnosed using the clinical tests. Patients and methods: Thirty cases and 30 controls were entered into this study. Metabolic profiling was obtained using proton nuclear magnetic resonance spectroscopy (1HNMR) to seek metabolites that are helpful for the detection of CD. Classification of CD and healthy subject was done using random forest (RF). Results: The obtained classification model showed an 89% correct... 

    Kinetics, experimental and simulation studies of Chinese Hamster Ovary cell growth in a packed-bed bioreactor

    , Article World Applied Sciences Journal ; Volume 15, Issue 11 , 2011 , Pages 1568-1575 ; 18184952 (ISSN) Shakibaie, M ; Tabandeh, F ; Zomorodipour, A. R ; Mohammad-Beigi, H ; Ebrahimi, S ; Habib Ghomi, H ; Sharif University of Technology
    2011
    Abstract
    To figure out the relationship between nutrient deprivation and cell growth, simulation can be effective. In the present work, the growth of Chinese Hamster Ovary (CHO) cells was simulated based on stoichiometric and kinetics calculations. The simulation results were compared to the experimental data from a packed-bed bioreactor and a good agreement was observed. The kinetic parameters (K Glc, K Amn, K Lact and μ Max) were optimized by a genetic algorithm method using stoichiometric parameters (Y X/Glc, Y X/Amm, and Y Lac/Glc). The stoichiometric and kinetic parameters were used in the simulation to study the growth of CHO cells. The concentrations of the toxic by-products, ammonium and... 

    Pore-Scale Investigation of Polymer Enhanced Low Salinity Water flooding EOR

    , M.Sc. Thesis Sharif University of Technology Posht Panah, Mohammad Reza (Author) ; Mahani, Hassan (Supervisor) ; Rostami, Behzad (Supervisor)
    Abstract
    Low salinity water flooding (LSWF) is a relatively new EOR method in which low salinity or modified ionic composition water is injected into the reservoir to alter its wettability toward a more water-wettable state to accelerate oil recovery. Ease of field deployment and relatively low cost, as well as laboratory results confirming the positive effect of this method in improving the oil recovery factor, have made this technique attractive in the oil industry.Despite the many advantages of this method, overcoming the mixing between low and high salinity water which occurs due to a high mobility ratio between these two fluids is essential because it negatively affects the efficiency of LSWF.... 

    Persian End-To-End Speech Recognition

    , M.Sc. Thesis Sharif University of Technology Hajipour Ghomi, Farzaneh (Author) ; Sameti, Hossein (Supervisor)
    Abstract
    This thesis provids a Persian End-To-End Speech Recognition system. In this system, the input is low-level features of speech signal. Deep recurrent neural networks (RNNs) and Long Short-Term Memory (LSTM) units as the RNN building blocks are used as the acoustic model. Continuous speech data is labeled by the CTC which is applied as the output layer of a recurrent neural network. By using the CTC objective function, acoustic modeling problem is simplified to just an RNN learning problem over pairs of speech and context-independent (CI) label sequences. A distinctive feature of this system is a generalized decoding approach based on weighted finite-state transducers (WFSTs), which enables... 

    Mechanical strength improvement of mud motor’s elastomer by nano clay and prediction the working life via strain energy

    , Article International Journal of Engineering, Transactions B: Applications ; Volume 32, Issue 2 , 2019 , Pages 184-191 ; 1728144X (ISSN) Izadi, M ; Tabatabaee Ghomi, M ; Pircheraghi, G ; Sharif University of Technology
    Materials and Energy Research Center  2019
    Abstract
    In directional drilling, the most important thing that leads to pulling out the drill string is end of mud motor working life. Considering the working conditions of down hole mud motors; increasing the mechanical properties of their stator’s elastomer is crucial. Some attempts were done to increase the motor performance through geometrical changes but lack of material improvement is significant in previous studies. In this study, NBR/nanoclay composite samples were prepared through melt intercalation in an internal mixer and tested with regard to the temperature and drilling mud of down hole. Hardness, tear, fatigue and tensile test results of neat NBR elastomer and nanocomposite of NBR and... 

    Investigation of EGRET gamma-ray sources by an extensive air shower experiment

    , Article 29th International Cosmic Ray Conference, ICRC 2005, Pune, 3 August 2005 through 10 August 2005 ; Volume 6 , 2005 , Pages 29-32 Khakian Ghomi, M ; Samimi, J ; Bahmanabadi, M ; Sharif University of Technology
    Tata Institute of Fundamental Research  2005
    Abstract
    Ultra-high-energy ( E ≥ TeV) Extensive Air Showers (EASs) have been monitored for a period of five years (1997-2003 ), using a small array of scintillator detectors in Tehran, Iran. The data have been analyzed to take in to account of the dependence of source counts on zenith angle. During a calendar year different sources come in the field of view of the detector at varying zenith angles. Because of varying thickness of the overlaying atmosphere, the shower count rate is extremely dependent on zenith angle which have been carefully analyzed over time. High energy gamma-ray sources from the EGRET third catalogue where observed and the data were analyzed using an excess method. Upper limits... 

    Observation of EGRET gamma-ray sources by an extensive air shower experiment

    , Article Astronomy and Astrophysics ; Volume 434, Issue 2 , 2005 , Pages 459-467 ; 00046361 (ISSN) Khakian Ghomi, M ; Bahmanabadi, M ; Samimi, J ; Sharif University of Technology
    2005
    Abstract
    Ultra-high-energy (E > 100 TeV) Extensive Air Showers (EASs) have been monitored for a period of five years (1997-2003), using a small array of scintillator detectors in Tehran, Iran. The data have been analyzed taking into account the dependence of source counts on zenith angle. During a calendar year different sources come into the field of view of the detector at varying zenith angles. Because of varying thickness of the overlaying atmosphere, the shower count rate is extremely dependent on zenith angle, which has been carefully analyzed over time (Bahmanabadi et al. 2002, Exp. Astron., 13, 39). High energy gamma-ray sources from the EGRET third catalogue where observed and the data were... 

    Experimental studies of positive and negative atmospheric muons with a cosmic rays telescope

    , Article Astroparticle Physics ; Volume 24, Issue 3 , 2005 , Pages 183-190 ; 09276505 (ISSN) Bahmanabadi, M ; Khakian Ghomi, M ; Sheidaei, F ; Sharif University of Technology
    2005
    Abstract
    An experiment has been developed for the measurement of the muon charge ratio (ratio of positive to negative muons) in the cosmic ray flux in energy range 0.236-0.242 GeV. The muon charge ratio is found to be 1.35 ± 0.10 with a mean zenith angle of 32° ± 5°. Meanwhile, the distributions of muons in zenith (θ) and azimuth angles have been studied. A cosnθ distribution with n = 1.95 ± 0.13 has been obtained. An asymmetry has been observed in East-West directions because of geomagnetic field. © 2005 Elsevier B.V. All rights reserved