نتایج جستجو برای: machine vector control

تعداد نتایج: 1707090  

Journal: :iranian journal of mathematical chemistry 2016
m. adib

integrally skinned asymmetric membranes based on nanocompositepolyethersulfone were prepared by the phase separation process using the supercritical co2 as a nonsolvent for the polymer solution. in present study, the effects of temperature and nanoparticle on selectivity performance and permeability of gases has beeninvestigated. it is shown that the presence of silica nanoparticles not only di...

Journal: :journal of mining and environment 2012
r. gholami a. moradzadeh

reservoir permeability is a critical parameter for characterization of the hydrocarbon reservoirs. in fact, determination of permeability is a crucial task in reserve estimation, production and development. traditional methods for permeability prediction are well log and core data analysis which are very expensive and time-consuming. well log data is an alternative approach for prediction of pe...

Journal: :iranian journal of medical physics 0
nima sahba master of science in biomedical engineering, research center for science and technology in medicine, islamic azad university, tehran, iran alireza ahmadian associate professor in biomedical engineering and physics, research center for science and technology in medicine, tehran university of medical sciences, tehran, iran nader riahi alam associate professor in biomedical engineering and physics, research center for science and technology in medicine, tehran university of medical sciences, tehran, iran masoumeh giti radiologist, imaging center, imam khomeini hospital, tehran university of medical sciences, tehran, iran

introduction:  breast  cancer  is  a  leading  cause  of  death  among  females  throughout  the  world.  currently,  radiologists are able to detect only 75% of breast cancer cases. making use of computer-aided design (cad)  can play an important role in helping radiologists perform more accurate diagnoses.   material and methods: using our hybrid method, the background and the pectoral muscle...

Journal: :journal of medical signals and sensors 0
jalil rasekhi mohammad reza karami mollaei mojtaba bandarabadi cesar a teixeira antonio dourado

bivariate features, obtained from multichannel electroencephalogram (eeg) recordings, quantify the relation between different brain regions. studies based on bivariate features have shown optimistic results for tackling epileptic seizure prediction problem in patients suffering from refractory epilepsy. a new bivariate approach using univariate features is proposed here. differences and ratios ...

Journal: :journal of advances in computer research 2014
bahareh gholipour goodarzi hamid jazayeri soheil fateri

in recent years, the needs of the internet are felt in lives of all people.  accordingly, many studies have been done on security in virtual environment. old technics such as firewalls, authentication and encryption could not provide internet security completely; so, intrusion detection system is created as a new solution and a defense wall in cyber environment. many studies were performed on d...

Journal: :journal of advances in computer research 2013
zeinab kermansaravi hamid jazayeriy soheil fateri

internet applications spreading and its high usage popularity result insignificant increasing of cyber-attacks. consequently, network security has becomea matter of importance and several methods have been developed for these attacks.for this purpose, intrusion detection systems (ids) are being used to monitor theattacks occurred on computer networks. data mining techniques, machinelearning, ne...

Journal: :iranian journal of oil & gas science and technology 2013
mohsen karimian nader fathianpour jamshid moghaddasi

porosity is considered as an important petrophysical parameter in characterizing reservoirs, calculating in-situ oil reserves, and production evaluation. nowadays, using intelligent techniques has become a popular method for porosity estimation. support vector machine (svm) a new intelligent method with a great generalization potential of modeling non-linear relationships has been introduced fo...

Journal: :journal of computer and robotics 0
mojgan elikaei ahari faculty of computer and information technology engineering, qazvin branch, islamic azad university, qazvin, iran babak nasersharif electrical and computer engineering department, k.n. toosi university of technology, iran

different approaches have been proposed for feature selection to obtain suitable features subset among all features. these methods search feature space for feature subsets which satisfies some criteria or optimizes several objective functions. the objective functions are divided into two main groups: filter and wrapper methods.  in filter methods, features subsets are selected due to some measu...

Journal: :journal of medical signals and sensors 0
parinaz mortaheb mehdi rezaeian

segmentation and three‑dimensional (3d) visualization of teeth in dental computerized tomography (ct) images are of dentists’ requirements for both abnormalities diagnosis and the treatments such as dental implant and orthodontic planning. on the other hand, dental ct image segmentation is a difficult process because of the specific characteristics of the tooth’s structure. this paper presents ...

2005
S. MOULAHOUM

Vector controlled induction machine drives are increasingly used in industrial drive systems, but the drive performance often degrades with the machine parameter variations. In this paper, a modified vector control system is proposed to achieve decoupling when saturation and iron losses are taking into account. The simulated and experimental results of the modified controller are presented to v...

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