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Wyszukujesz frazę "Abbasi, A." wg kryterium: Autor


Tytuł:
Fast FCM with spatial neighborhood information for brain MR image segmentation
Autorzy:
Biniaz, A.
Abbasi, A.
Powiązania:
https://bibliotekanauki.pl/articles/91616.pdf
Data publikacji:
2013
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
Fuzzy c-Means clustering
FCM
Fast FCM
FFCM
spatial Fast FCM
sFFCM
MR image
noise interference
Opis:
Among different segmentation approaches Fuzzy c-Means clustering (FCM) is a welldeveloped algorithm for medical image segmentation. In emergency medical applications quick convergence of FCM is necessary. On the other hand spatial information is seldom exploited in standard FCM; therefore nuisance factors can simply affect it and cause misclassification. This paper aims to introduce a Fast FCM (FFCM) technique by incorporation of spatial neighborhood information which is exploited by a linear function on fuzzy membership. Applying proposed spatial Fast FCM (sFFCM), elapsed time is decreased and neighborhood spatial information is exploited in FFCM. Moreover, iteration numbers by proposed FFCM/sFFCM techniques are decreased efficiently. The FCM/FFCM techniques are examined on both simulated and real MR images. Furthermore, to considerably decrease of convergence time and iterations number, cluster centroids are initialized by an algorithm. Accuracy of the new approach is same as standard FCM. The quantitative assessments of presented FCM/FFCM techniques are evaluated by conventional validity functions. Experimental results demonstrate that sFFCM techniques efficiently handle noise interference and significantly decrease elapsed time.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2013, 3, 1; 15-25
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Segmentation and edge detection based on modified ant colony optimization for iris image processing
Autorzy:
Biniaz, A.
Abbasi, A.
Powiązania:
https://bibliotekanauki.pl/articles/91674.pdf
Data publikacji:
2013
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
ant colony optimization
stocktickerACO
digital image processing
artificial ant
image processing
iris
Opis:
Ant colony optimization (stocktickerACO) is a meta-heuristic algorithm inspired by food searching behavior of real ants. Recently stocktickerACO has been widely used in digital image processing. When artificial ants move in a discrete habitat like an image, they deposit pheromone in their prior position. Simultaneously, vaporizing of pheromone in each iteration step avoids from falling in the local minima trap. Iris recognition because of its great dependability and non-invasion has various applications. simulation results demonstrate stocktickerACO algorithm can effectively extract the iris texture. Also it is not sensitive to nuisance factors. Moreover, stocktickerACO in this research preserves details of the various synthetic and real images. Performance of ACO in iris segmentation is compared with operation of traditional approaches such as canny, robert, and sobel edge detections. Experimental results reveal high quality and quite promising of stocktickerACO to segment images with irregular and complex structures.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2013, 3, 2; 133-141
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Enhancement of High Power High Repetition Rate Semiconductor Opening Switches
Autorzy:
Abbasi, A.
Niayesh, K.
Shakeri, J.
Powiązania:
https://bibliotekanauki.pl/articles/1807869.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.30.De
Opis:
High power semiconductor opening switches (SOSs) with $P^+PNN^+$ doping profile have been used in different pulsed power applications because of their fast high current interruption capability. In high pulsed power applications with high repetition rate, temperature increase of the semiconductor switch during its operation is no more negligible. In this paper, the cut-off characteristics of SOSs with different doping profiles are compared and then the impact of the temperature increase on the performance of the semiconductor opening switch is investigated using a detailed physical model. The simulation results indicate that due to the temperature increase of the switch, both the current amplitude and the cut-off characteristics of the switch are affected. Semiconductor opening switches with different base materials (Si and SiC) are studied. Due to favorable intrinsic characteristics of SiC (higher thermal conductivity, higher saturation velocity and higher breakdown electric field), the performance of the SOS can be enhanced using SiC as the base material and the design of compact high pulsed power applications can be achieved.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 983-985
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Histopathological changes and oxidative damage in hepatic tissue of rats experimentally infected with Babesia bigemina
Autorzy:
Esmaeilnejad, B.
Tavassoli, M.
Samiei, A.
Abbasi, A.
Shafipour, A.
Esmaeilnejad, N.
Powiązania:
https://bibliotekanauki.pl/articles/2087681.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
liver
oxidative damage
rats
antioxidants
Babesia bigemina
Źródło:
Polish Journal of Veterinary Sciences; 2018, 21, 3; 517-524
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frequency Selection Based Separation of Speech Signals with Reduced Computational Time Using Sparse NMF
Autorzy:
Varshney, Y. V.
Abbasi, Z. A.
Abidi, M. R.
Farooq, O.
Powiązania:
https://bibliotekanauki.pl/articles/176829.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sparse NMF
non-negative matrix factorisation
mixed speech recognition
machine learning
Opis:
Application of wavelet decomposition is described to speed up the mixed speech signal separation with the help of non-negative matrix factorisation (NMF). It is assumed that the basis vectors of training data of individual speakers had been recorded. In this paper, the spectrogram magnitude of a mixed signal has been factorised with the help of NMF with consideration of sparseness of speech signals. The high frequency components of signal contain very small amount of signal energy. By rejecting the high frequency components, the size of input signal is reduced, which reduces the computational time of matrix factorisation. The signal of lower energy has been separated by using wavelet decomposition. The present work is done for wideband microphone speech signal and standard audio signal from digital video equipment. This shows an improvement in the separation capability using the proposed model as compared with an existing one in terms of correlation between separated and original signals. Obtained signal to distortion ratio (SDR) and signal to interference ratio (SIR) are also larger as compare of the existing model. The proposed model also shows a reduction in computational time, which results in faster operation.
Źródło:
Archives of Acoustics; 2017, 42, 2; 287-295
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pre-harvest foliar application of vegetables extract improves the quality of harvested grape
Autorzy:
Abbasi, N.A.
Kareem, A.
Hafiz, I.A.
Qureshi, A.A.
El-Gioushy, S.
Powiązania:
https://bibliotekanauki.pl/articles/12692459.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
plant cultivation
grapevine
Vitis vinifera
Perlette cultivar
King Ruby cultivar
grape
fruit
vegetable extract
pre-harvest application
foliar application
total soluble solid
total phenolics content
ascorbic acid content
quality improvement
fruit quality
fruit storage
Opis:
This study focused on examining the effect of vegetables extract foliar application on storage quality of the grapes grape (Vitis vinifera L. cvs. ‘Perlette’ and ‘King’s Ruby’). The vines were sprayed after fruit set twice at 15 days interval at concentrations of 0, 0.20%, 0.30% and 0.40%. Fruit were harvested and kept under cold-storage at 0.5 ±0.5°C and 90% RH for 28 days. The physicochemical properties of treated and untreated berries were analyzed at 7 days intervals during the cold storage. The results showed that the pre-harvest application of vegetable extracts reduced the weight loss and inhibited the fruit decay. Treated grape also had higher ascorbic acid contents, total phenolics, 2,2-diphenyl-1-picrylhydrazyl-radical (DPPH) scavenging activity, and higher soluble solid contents, titratable acidity, and reduced sugar:acid ratio. The concentration of 0.30% and cultivar ‘Kings Ruby’ gave the best result as compared to untreated control. In conclusion, pre-harvest vegetables extract application on berries showed higher antioxidant activities in grape berries, and maintained their post-harvest quality. These results indicated that foliar spray of vegetables extract could effectively improve the fruit quality, mainly through the reduction of phenolic content.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 6; 107-117
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correction to the Higher Dimensional Black Hole Entropy
Autorzy:
Farmany, A.
Abbasi, S.
Naghipour, A.
Powiązania:
https://bibliotekanauki.pl/articles/1812029.pdf
Data publikacji:
2008-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
04.60.-m
04.70.-s
04.70.Dy
03.65.Ud
Opis:
Using the modified Hawking radiation of a Schwarzschild black hole (based on the generalized uncertainty principle) we obtained the Bekenstein-Hawking entropy of a higher dimensional Schwarzschild black hole. Furthermore, the thermodynamics of such black hole is studied.
Źródło:
Acta Physica Polonica A; 2008, 114, 4; 651-655
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High aspect ratio graphene nanosheets cause a very low percolation threshold for polymer nanocomposites
Autorzy:
Jan, R.
Habib, A.
Abbasi, H.
Powiązania:
https://bibliotekanauki.pl/articles/1061875.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Tm
Opis:
Liquid exfoliated, high aspect ratio (1272) graphene nanosheets (GNS) are dispersed in thermoplastic polyurethane (TPU) to prepare range of nanocomposites. A three fold increase in direct current conductivity is recorded at 0.0055 volume fraction (V_{f}) of GNS-TPU composites as compared to pristine TPU. It is suggested that the percolation threshold for conducting network achieved at low filler loadings is due to the high aspect ratio and homogeneous dispersion of GNS within the polymer. The experimental results are interpreted using interparticle distance model and modified power law. The two models predict threshold filler loading in 0.015-0.001 range volume fraction GNS based on the average values of mean length and no. of layers per nanosheet. The experimental results favor modified power law as it relies on aspect ratio of fillers. A slight deviation in our study from modified power law may be due to aggregation in as prepared GNS.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 478-481
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Orthonormal basis function fuzzy systems for biological wastewater treatment processes modeling
Autorzy:
Chaibakhsh, A.
Chaibakhsh, N.
Abbasi, M.
Norouzi, A.
Powiązania:
https://bibliotekanauki.pl/articles/91632.pdf
Data publikacji:
2012
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
fuzzy model
fuzzy system
orthonormal basis functions
OBF
treatment process
Laguerre filters
Opis:
In this paper, fuzzy models with orthonormal basis functions (OBF) framework are employed for modeling the nonlinear dynamics of biological treatment processes. These models are consisting of a linear part describing the system dynamics (Laguerre filters) followed by a non-linear static part (fuzzy system). The training procedure contains of two main steps: 1) obtaining the optimum time-scale and the order of truncated Laguerre network as the linear part and 2) defining membership functions, corresponding rules and adjusting the consequent parameters of fuzzy system as the nonlinear part. A comparison between the responses of the developed model and the original plant was performed in order to validate the accuracy of the developed model.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2012, 2, 4; 343-356
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An evaluation of water quality from Mojen River, by NSFWQI index
Autorzy:
Javid, A.
Yaghmaeian, K
Abbasi, E
Roudbari, A
Powiązania:
https://bibliotekanauki.pl/articles/124136.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
NSFWQI
Mojen River
pollution
water quality
Opis:
Water quality index (WQI) is valuable and unique rating to depict the overall water quality status in a single term that is helpful for the selection of appropriate treatment technique to meet the concerned issues. The aim of the study was to evaluating water quality from Mojen River by Water Quality Index based on National Science Foundation (NSFWQI). For this purpose, samples were collected from stations at up, middle and downstream of Mojen River in Semnan province (the biggest river in region) in a 2 years interval of 2013-2014 years. Nine parameters namely Turbidity, Biochemical Oxygen Demand, Dissolved Oxygen, Fecal Coliform, nitrate, pH, temperature, total solids and total phosphate were considered to compute the index. Our findings highlighted the deterioration of water quality in the river due to industrialization and human activities. According to NSFWQI, the best condition was recorded in the Dark haniab (Upstream) and the worst condition concerned the Pole (Midstream).
Źródło:
Journal of Ecological Engineering; 2014, 15, 4; 1-6
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł

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