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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.
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.
Transient Ischemic Attacks and Presence of an Acute Brain Lesion in Diffusion-Weighted MRI: Study of 50 Patients
M Sabeti,A Naser Moghadasi,M Aloosh,SM Paknejad
Tehran University Medical Journal , 2012,
Abstract: Background: Finding an acute brain lesion by diffusion-weighted (DW) MRI upon an episode of transient ischemic attack (TIA) is a predictor of imminent stroke in the near future. Therefore, exploring risk factors associated with lesions in DW-MRI of the brain is important in adopting an approach to TIA management. In the current study, we tried to determine the risk factors associated with lesions in DW-MRI of the brain in patients experiencing TIA episodes.Methods: Fifty patients with TIA were recruited consecutively in Sina Hospital, Tehran, Iran, over a 6-month period between July 2008 and January 2009. All of the patients underwent a complete neurological examination and laboratory tests. Brain DW-MRIs were performed for all the patients within 72 hours of a TIA episode.Results: DW-MRI revealed an acute lesion in 16% of the participants. There was a significant correlation between presence of an acute lesion in DW-MRI and TIA duration, history of diabetes mellitus and presence of unilateral facial palsy (P=0.0003, P=0.02 and P=0.008, respectively). Other variables such as age, hypertension, hyperlipidemia, past history of TIA, headache, vertigo, and sensory or visual disturbances had no significant relation with the presence of an acute lesion in DW-MRI.Conclusion: Duration of TIA, presence of diabetes mellitus and unilateral facial palsy are risk factors for an acute lesion in DW-MRI, meaning that patients with such risk factors are at risk for stroke in the near future.
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.
Microstrip Low-Pass Filters by Using DGS with Folded T-Shaped Arms
Mohammad Naser-Moghadasi,R.A. Sadeghzadeh,Shahabodin YazdaniFard,Bal S. Virdee
Advanced Computational Techniques in Electromagnetics , 2012, DOI: 10.5899/2012/acte-00122
Abstract: In this paper, two novel Low-Pass Filters (LPFs) using Defected Ground Structure (DGS) slot with a pair of folded T-shaped arms are presented. The resonant frequency of the slot can be easily controlled by changing the folded T-shaped dimensions, without changing the area taken by the structure. Using this slot, two quasi-elliptic LPFs were designed, fabricated, and tested. The experimental results show good agreement with simulation results and demonstrate that excellent stop-band performance could be obtained through the proposed LPF. The filter has a cut-off frequency of about 2.4 GHz.
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.
Evaluation of the Environmental Impact Assessment System in Bahrain  [PDF]
Humood A. Naser
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.32029
Abstract: Environmental Impact Assessment (EIA) was formally adopted as a measure to protect the environment in Bahrain in 1998. A decade after its implementation, this paper evaluates the current EIA system in Bahrain using a set of criteria. The evaluation was based on review of literature, investigation of legislative and administrative framework and interviews with EIA practitioners. Several measures are required to further strengthen the EIA system in Bahrain including amending EIA laws to include whole aspects of EIA process, developing comprehensive guidelines on procedural EIA, increasing public participation, improving capacity building and integrating environmental concerns to higher-level policy making through existing national environmental strategies. Findings of this study could contribute to wider international experience of EIA performance in developing countries.
Effects of Multi-Stage Flash and Reverse Osmosis Desalinations on Benthic Assemblages in Bahrain,Arabian Gulf  [PDF]
Humood A. Naser
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.42021
Abstract:

Marine environment of the Arabian Gulf is naturally stressed due to marked fluctuations in sea temperatures and high salinities. Anthropogenically induced stresses including waste water discharges from desalination plants could pose additional threats to the coastal and marine ecosystems in the Arabian Gulf. Macrobenthic assemblages in the proximity of two major desalination plants that use Multi-Stage Flash (MSF) and brackish water Reverse Osmosis (RO) technologies in Bahrain were investigated. Reduced levels of biodiversity and abundance were recorded in sampling stations adjacent to the outlet of MSF reflecting severe impacts on macrobenthic assemblages caused by brine effluents that associated with high temperatures, salinities, and a range of chemical and heavy metal pollutants. Although localized severe impacts on macrobenthic assemblages were detected, collective discharges of desalination effluents, may synergistically contribute to the degradation of the naturally stressed marine ecosystems and natural resources in the Arabian Gulf.


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.
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