XML
-
-
List of Articles
-
Open Access Article
1 - Matching Pursuit Distribution And Minimum Cross Entropy Technique
صدیقه غفرانی احمد آیت اللهیThe traditional method for studying non-stationary signals is spectrogram based on the short-time Fourier transform (STFT). The well known limitation of the STFT is the inherent trade-off between time and frequency resolution. The Wigner-Ville (WV) distribution has the MoreThe traditional method for studying non-stationary signals is spectrogram based on the short-time Fourier transform (STFT). The well known limitation of the STFT is the inherent trade-off between time and frequency resolution. The Wigner-Ville (WV) distribution has the best time-frequency resolution, but its draw back is generating cross-terms. The matching pursuit (MP) distribution based on using the Gaussian atom is always positive, does not include cross-term, and has convenient resolution. In this paper, we have shown in addition to the known properties, the MP distribution can also remove the additive noise inherently. On the other words, we are able to remove the noise just by limiting the algorithm iterations and without paying any additional cost. Although the MP distribution based on using the Gaussian atoms is always positive and it has convenient resolution, according to the MP the time marginal and the frequency marginal will not be obtained accurately. In this paper, it has been shown that by implementing the minimum cross entropy (MCE) technique according to the MP distribution as a priory positive distribution, the new extracted distribution has the most similarity to the MP distribution and it also satisfies the correct time and frequency marginal. Manuscript profile -
Open Access Article
2 - Comparative Studies of the LMS and MSLMS Algorithms Convergence Speed in the Active Noise Control Systems
اشرف انوری محمدحسن شناسا علی خاکی ‎صدیقIn this paper convergence speed of Least Mean Square (LMS) and Multi Stage Least Mean Square (MSLMS)in the active noise control systems have been studied and compared. The results show that MSLMS algorithm convergence rate is more efficient than LMS algorithm. Moreover; MoreIn this paper convergence speed of Least Mean Square (LMS) and Multi Stage Least Mean Square (MSLMS)in the active noise control systems have been studied and compared. The results show that MSLMS algorithm convergence rate is more efficient than LMS algorithm. Moreover; using of the above algorithms in the active noise control systems have been simulated. The simulation results show capability of the MLSM algorithm utilization in the active noise control systems. Manuscript profile -
Open Access Article
3 - The Impact of Structural Parameters on the Performance of Nanoscale DG-SOI MOSFETs in Sub threshold Region
فاطمه کهنی حامد نعمتیان مرتضی فتحی پورThis paper is intended to investigate the impact of structural parameters (in particular: body thickness (TBody ), Source/Drain Length (LS /LD ) and gate oxide thickness (TOX )) on the electrical characteristics of nanoscale Double Gate SOI MOSFET (DG SOI MOSFET) in sub MoreThis paper is intended to investigate the impact of structural parameters (in particular: body thickness (TBody ), Source/Drain Length (LS /LD ) and gate oxide thickness (TOX )) on the electrical characteristics of nanoscale Double Gate SOI MOSFET (DG SOI MOSFET) in subthreshold regime. It will be shown that a reduction in Ls /Ld doesn't have a profound effect on both on-current and Drain Induced Barrier Lowering Effect (DIBL); however it increases the effective Gate Capacitance (CGeff ) significantly. A decrease in Tbody results in an increase in CGeff and a decrease in potential barrier height while ION is reduced. This investigation also proves that as TOX is increased, CGeff is decreased. A decline in TOX reduces ION while it drastically increases ION /IOFF ratio. Manuscript profile -
Open Access Article
4 - Improvement of Sea Klatter Modeling and Target detection by Using Tsallis distribution Function
وحید طباطباوکیلی محمد واحدیSea Klatter is the rader reflection from water surface which can be detected by pulsating rader and it is a very complex part of radar klatter modeling. Many approaches for fitting sean klatter amplitude with statistical distribution functions have been done, but sea kl MoreSea Klatter is the rader reflection from water surface which can be detected by pulsating rader and it is a very complex part of radar klatter modeling. Many approaches for fitting sean klatter amplitude with statistical distribution functions have been done, but sea klatter nonstatinary characteristics makes it here impossible to complete fitting with distribution funcrions. So, The parameters of distribution function to be estimated and hence target detection from sea klatter is more complicated. In The recent years, The Tsallis distribution have been proposed for klatter simulation. This distribution function resulted from Tsallis entropy which is generalized form of shanen entropy. Two main short comes of the Tsallis simulation are: First, short step size parameters estimation and long time comsuming; second, low target detection accuareey. Main Contribution of this paper increasing of step size for parameters estimation and improving target detection accurecy with using full samples set. Manuscript profile -
Open Access Article
5 - Long wave length infrared photo detector design bared on electromagnetic transpire
مجید ضیائی شیشوان Ali RostamiIn this paper a novel long-wavelength infrared (IR) photodetector based on Electromagneticlly induced transparency (EIT) is proposed. This kind of photo-detectors is suitable for operation in room temperature and terahertz range (low level signal) detection. Main idea f MoreIn this paper a novel long-wavelength infrared (IR) photodetector based on Electromagneticlly induced transparency (EIT) is proposed. This kind of photo-detectors is suitable for operation in room temperature and terahertz range (low level signal) detection. Main idea for operation in the room temperature is related to convert the incoming long-wave length IR signal to short-wave length or visible probe field through EIT phenomena. Realization of the idea implemented with using atomic states (that can be simulated by introducing quantum wells or dots). In the proposed structure long-wave length IR signal dose not directly interact with electrons, but affects the absorption characteristic of short-wave length or visible probe field. Therefore; the introduced structure reduces and/or cancels out the thermionic dark current component and can operate as a long-wave length photo detector Manuscript profile -
Open Access Article
6 - Application of Fuzzy ARTMAP Neural Networks for Epileptic spike detection Using Wavelet Feature Extraction
فاطمه صفری علی فرخی نعمت طالبیThis paper aims to introduce two different classifier systems based on fuzzy ARTMAP neural network for the automatic detection of epileptic spikes in 19-channel human electroencephalogram these algorithm (EEG) are fast and delivers satisfactory results. EEG signals are MoreThis paper aims to introduce two different classifier systems based on fuzzy ARTMAP neural network for the automatic detection of epileptic spikes in 19-channel human electroencephalogram these algorithm (EEG) are fast and delivers satisfactory results. EEG signals are decomposed into 4 sub-bands by means of Discrete Wavelet Transform (DWT). The inputs of the networks consist of two different features, which are extracted from the sub-bands 3 and 4. The performances of the classifiers introduced in this paper, are compared with each other’s and other similar systems, according to the sensitivity, specificity and selectivity values. Manuscript profile -
Open Access Article
7 - Performance Evaluation of Mobile Ad-Hoc Network Based on DSR Routing Protocol
شهریار شیروانی مقدم مرتضی شاهمرادیIn this paper, a brief review of most conventional routing protocols for mobile Ad- Hoc networks has been conducted, moreover Dynamic Source Routing (DSR) protocol has been discussed with more details. The focuses on both route discovery and route maintaining phases as MoreIn this paper, a brief review of most conventional routing protocols for mobile Ad- Hoc networks has been conducted, moreover Dynamic Source Routing (DSR) protocol has been discussed with more details. The focuses on both route discovery and route maintaining phases as the main part of DSR protocol have been done and simulated in this paper. Random movement pattern for mobility of nodes have been assumed with random walk model. Also, negative exponential random model for time duration of a call. In addition with letting poisson distribution of a call demand, are assumed as the main problem definitions. Two main performance indices namely, call blocking and forced termination probabilities as constraints have been introduced. The above two indices for different loads and moving velocities have been simulated. In order to show the effects of Ad- Hoc routing protocol on service quality. Two type of direct and indirect path servicing have been studied. Results shows that a multi loop path introduces lower blocking and forced termination rates. Manuscript profile -
Open Access Article
8 - Using ANFIS as Indicator in the Networks Containing SVC and STATCOM for Voltage Collapse Phenomena
نعمت طالبی منصور شیخانThis paper focuses on using an ANFIS indicator for it’s proximity to collapse point with emphsizing on application of two Flexible AC Transmission System (FACTS) devices’ namely, Static Var Compensator (SVC) and Static Compensator (STATCOM), In order to stud MoreThis paper focuses on using an ANFIS indicator for it’s proximity to collapse point with emphsizing on application of two Flexible AC Transmission System (FACTS) devices’ namely, Static Var Compensator (SVC) and Static Compensator (STATCOM), In order to study the effects on voltage collapse phenomena in power systems. Based on system results at the point of collapse ‘Application of these devices loadability or increase could increase loadability margin to collapse point. Also,ANFIS as an indicator for proximity to collapse point has been applied succesfuly. The IEEE 14 bus test system is used to illustrate the effects of FACTS devices on voltage collapse phenomena and applying of ANFIS as an indicator for proximity index simulations. Manuscript profile
-
The rights to this website are owned by the Raimag Press Management System.
Copyright © 2021-2024