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Search Results: 1 - 10 of 1855 matches for " Mahdi Naser-Moghadasi "
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Evaluating Effects of Two Alternative Filters for the Incremental Pruning Algorithm on Quality of Pomdp Exact Solutions  [PDF]
Mahdi Naser-Moghadasi
International Journal of Intelligence Science (IJIS) , 2012, DOI: 10.4236/ijis.2012.21001
Abstract: Decision making is one of the central problems in artificial intelligence and specifically in robotics. In most cases this problem comes with uncertainty both in data received by the decision maker/agent and in the actions performed in the environment. One effective method to solve this problem is to model the environment and the agent as a Partially Observable Markov Decision Process (POMDP). A POMDP has a wide range of applications such as: Machine Vision, Marketing, Network troubleshooting, Medical diagnosis etc. In recent years, there has been a significant interest in developing techniques for finding policies for (POMDPs).We consider two new techniques, called Recursive Point Filter (RPF) and Scan Line Filter (SCF) based on Incremental Pruning (IP) POMDP solver to introduce an alternative method to Linear Programming (LP) filter for IP. Both, RPF and SCF have solutions for several POMDP problems that LP could not converge to in 24 hours. Experiments are run on problems from POMDP literature, and an Average Discounted Reward (ADR) is computed by testing the policy in a simulated environment.
Electromagnetic Pulse Coupling inside a Rectangular Enclosure with an Aperture  [PDF]
Mehdi Bahadorzadeh Ghandehari, Abbas Ali Lotfi-Neyestanak, Mohammad Naser-Moghadasi
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.33014
Abstract: The transmission line matrix time domain (TLM-TD) method is used to simulate the electromagnetic pulse (EMP) cou-pled inside a shielding box with an aperture. Simulations for different electromagnetic pulses regarding to different rise time and fall time have been performed. The results for shielding effectiveness of these different excitations have been presented. A simple method that uses an extra metal for reducing the interference has also been proposed and tested.
A Moment Method Simulation of Electromagnetic Scattering from Conducting Bodies
Saeed Hatamzadeh-Varmazyar;Mohammad Naser-Moghadasi;Zahra Masouri
PIER , 2008, DOI: 10.2528/PIER07122502
Abstract: In this paper a moment method simulation of electromagnetic scattering problem is presented. An effective numerical method for solving this problem based on the method of moments and using block-pulse basis functions is proposed. Some examples of engineering interest are included to illustrate the procedure. The scattering problem is treated in detail, and illustrative computations are given for some cases. This method can be generalized to apply to objects of arbitrary geometry and arbitrary material.
Spurious Response Suppression in Hairpin Filter Using DMS Integrated in Filter Structure
Mohammad Naser-Moghadasi;Mahmoud Alamolhoda;Bahman Rahmati
PIER C , 2011, DOI: 10.2528/PIERC10110914
Abstract: In this paper several Defected Microstrip Structure (DMS) are used to suppress the first and second spurious responses in microstrip hairpin filters. The DMSs are integrated in filter structure, and therefore this method keeps the filter size unchanged. The DMS interconnection disturbs the current distribution only across the strip, thereby giving a modified microstrip line with certain stop band. The undesired spurious harmonics are suppressed through multiple transmission zeros which are added at these frequencies by designed DMSs. Experimental results verify that 25 dB suppression for the first harmonic and 40 dB suppression for the second harmonic, respectively, without affecting the main passband response. There is a good agreement between the simulated and measured results.
An Integral Equation Modeling of Electromagnetic Scattering from the Surfaces of Arbitrary Resistance Distribution
Saeed Hatamzadeh-Varmazyar;Mohammad Naser-Moghadasi
PIER B , 2008, DOI: 10.2528/PIERB07121404
Abstract: In this paper the problem of electromagnetic scattering from the resistive surfaces is carefully surveyed. We model this problem by the integral equations of the second kind. A new set of orthogonal basis functions is used to solve these integral equations via collocation method. Numerical solutions of these equations are given for some cases of resistance distributions. Presented method in this paper can be easily generalized to apply to other cases.
New Numerical Method for Determining the Scattered Electromagnetic Fields from Thin Wires
Saeed Hatamzadeh-Varmazyar;Mohammad Naser-Moghadasi
PIER B , 2008, DOI: 10.2528/PIERB07121303
Abstract: In this paper an effective numerical method for determining the scattered electromagnetic fields from thin wires is presented and discussed. This problem is modeled by the integral equations of the first kind. The basic mathematical concept is the method of moments. The problem of determining these scattered fields is treated in detail, and illustrative computations are given for several cases.
Improving of Shielding Effectiveness of a Rectangular Metallic Enclosure with Aperture by Using Extra Wall
Mehdi Bahadorzadeh Ghandehari;Mohammad Naser-Moghadasi;Amir Reza Attari
PIER Letters , 2008, DOI: 10.2528/PIERL07110706
Abstract: A new method for improving shielding effectiveness (SE) of a rectangular enclosure with multiple apertures has been proposed. In this method in order to compensate the effects of the apertures on reduction of (SE) parameter, instead of the one wall, two metallic walls containing apertures has been used. The numerical simulation uses a symmetric condensed node of TLM-TD (Transmission line Modeling Method-Time Domain) and subsequent Fourier Transform. The shielding effectiveness response to an electric field impulsive excitation is obtained. A study of the influence of the place of apertures in the walls and the distance between the two walls is presented.
Bickerstaff’s brainstem encephalitis: a case report
Toghae M,Naser-moghadasi A,Mehdipour-Aghabagher B
Tehran University Medical Journal , 2010,
Abstract: "n Normal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4 st1":*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:Arial; mso-bidi-theme-font:minor-bidi;} Background: Bickerstaff's brainstem encephalitis (BBE) is a very uncommon central nervous system disease with unknown etiology. As it is usually responsive to treatment, the diagnosis this disease is important. It seems There is no reported Bickerstaff's brainstem encephalitis case in Iran."n"nCase presentation: An 83 year old woman presented with vertigo, ataxia and dysarthria from a week prior to admission. Her 2 weighted MRI revealed high intensity lesions in the pons area. She received treatment with impression of ischemic stroke. After few days, lower extremities became weak symmetrically and deep tendon reflexes depressed. Deep sensory loss was noted too. The EMG-NCV studies showed acute polyneuropathy and in CSF examination increased protein content was noted. The patient improved after IVIG and corticosteroid therapy with impression of Bickerstaff's brainstem encephalitis."n"nConclusion: In spite of severe initial presentation, Bickerstaff's brainstem encephalitis has a good prognosis if it diagnosed and treated properly. Although clinical features is too important, but paraclinical work up are necessary to diagnose this syndrome.
Stability Analysis of MEMS Gyroscope Dynamic Systems
M. Naser-Moghadasi,F. Setoudeh,S. A. Olamaei
Advanced Computational Techniques in Electromagnetics , 2013, DOI: 10.5899/2013/acte-00124
Abstract: In this paper, the existence of a common quadratic Lyapunov function for stability analysis of MEMS Gyroscope dynamic systems has been studied then a new method based on stochastic stability of MEMS Gyroscope system has been proposed.
Implementation and investigation of circular slot UWB antenna with dual-band-notched characteristics
Kalteh Abdol,DadashZadeh Gholamreza,Naser-Moghadasi Mohammad
EURASIP Journal on Wireless Communications and Networking , 2011,
Abstract: The design and analysis of an ultra wideband aperture antenna with dual-band-notched characteristics are presented. The proposed antenna consists of a circular ring exciting stub on the front side and a circular slot on the back ground plane. By utilizing a parasitic strip and a T-shaped stub on the antenna structure, two notched bands of 850 MHz (3.5-4.35 GHz) and 900 MHz (5.05-5.95 GHz) are achieved. The proposed antenna is fabricated and measured. Measured results show that this antenna operates from 2.3 GHz to upper 11 GHz for voltage standing wave ratio less than 2, except two frequency notched bands of 3.5-4.35 and 5.05-5.95 GHz. Moreover, the experimental results show that proposed antenna has stable radiation patterns and constant gain. A conceptual circuit model, which is based on the measured impedance of the proposed antenna, is also shown to investigate the dual-band-notched characteristics.
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