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A Harmonic-Based Biologically Inspired Approach to Monaural Speech Separation
Rabiee, A.,Setayeshi, S.,Soo-Young Lee IEEE 2012 IEEE signal processing letters Vol.19 No.9
<P>This letter proposes a computational auditory scene analysis (CASA) model for monaural speech separation. In this model, we integrate three biologically inspired approaches for: auditory spectrogram generation, analysis of its spectro-temporal content, and tracking its harmonic structure. In a top-down process, the estimated ideal binary mask (EIBM) is calculated using the spectral amplitude of the extracted spectrograms to enhance the harmonic filters for separation. Experimental results showed that our model outperformed the harmonic magnitude suppression technique in both signal-to-interference ratio and percentage of crosstalk. Moreover, the result is comparable with a current state-of-the-art system.</P>
Two-Phase Flow Field Simulation of Horizontal Steam Generators
Ataollah Rabiee,Amir Hossein Kamalinia,KAMAL HADAD 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.1
The analysis of steam generators as an interface between primary and secondary circuitsin light water nuclear power plants is crucial in terms of safety and design issues. VVER-1000 nuclear power plants use horizontal steam generators which demand a detailedthermal hydraulics investigation in order to predict their behavior during normal andtransient operational conditions. Two phase flow field simulation on adjacent tube bundlesis important in obtaining logical numerical results. However, the complexity of the tubebundles, due to geometry and arrangement, makes it complicated. Employment of porousmedia is suggested to simplify numerical modeling. This study presents the use of porousmedia to simulate the tube bundles within a general-purpose computational fluid dynamicscode. Solved governing equations are generalized phase continuity, momentum,and energy equations. Boundary conditions, as one of the main challenges in thisnumerical analysis, are optimized. The model has been verified and tuned by simpletwo-dimensional geometry. It is shown that the obtained vapor volume fraction near thecold and hot collectors predict the experimental results more accurately than in previousstudies.
Hesamoddin Rabiee,Mohammad Soltanieh,Shadi Meshkat Alsadat,Seyyed Abbas Mousavi,Ali Ghadimi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Zeolite SAPO-34 was used for fabrication of mixed matrix membranes (MMMs) to improve the CO2/CH4/N2 gas separation performance of the neat Pebax1074 membrane. Permeability and selectivity of theMMMs were studied at different temperatures of 25–65 8C and pressures of 4–24 bars. Also sorption ofdifferent gases in MMMs was measured at 35 8C and different pressures, which showed enhancedsolubility coefficients. Moreover, thermal, morphological and mechanical properties of MMMs werecharacterized by differential scanning calorimetry (DSC), scanning electron microscope (SEM) andtensile analysis. The results showed excellent improvement in CO2/CH4 selectivity (about 70%) andCO2/N2 selectivity (about 15%) at 20 wt% SAPO-34 loading
Mechanical Behavior of a New Biphasic Calcium Phosphate Bone Graft
S. M. Rabiee,S. M. J. Mortazavi,F. Moztarzadeh,D. Sharifi,Sh. Sharifi,M. Solati-Hashjin,H. Salimi-Kenari,D. Bizari 한국생물공학회 2008 Biotechnology and Bioprocess Engineering Vol.13 No.2
The aim of this study was to create a new porous calcium phosphate implant for use as a synthetic bone graft substitute. Porous bioceramic was fabricated using a foam-casting method. By using polyurethane foam and a slurry containing hydroxyapatite-dicalcium phosphate powder, water, and additives, a highly porous structure (66 ± 5%) was created. The porous specimens possess an elastic modulus of 330 ± 32 MPa and a compressive strength of 10.3 ± 1.7 MPa. The X-ray diffraction patterns show hydroxyapatite and beta-pyrophosphate phases after sintering. A rabbit model was developed to evaluate the compressive strength and elastic modulus of cancellous bone defects treated with these porous synthetic implants. The compressive mechanical properties became weaker until the second month post implantation. After the second month, these properties increased slightly and remained higher than control values. New bone formed on the outside surface and on the macropore walls of the specimens, as osteoids and osteoclasts were evident two months postoperatively. Considering these properties, these synthetic porous calcium phosphate implants could be applicable as cancellous bone substitutes.
Amir H. Rabiee 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.12
A regenerative semi-active control system based on self-tuning Fuzzy proportional-derivative (PD) control strategy is applied to suppress the vortex-induced vibrations (VIV) of an elastically supported circular cylinder at low Reynolds numbers. Of particular interest was the effect of control parameter and capacitance on the VIV reduction and energy regeneration capabilities of adopted semi-active control system. A collaborative simulation which couples a Fuzzy PD controller along with the adjustable electromagnetic (EM) damper and corresponding energy harvesting circuit (implemented in MATLAB/Simulink) to the computational fluid dynamic (CFD) plant model (implemented in Fluent) is employed. It appears that the cylinder displacement amplitude, capacitor charging speed, and maximum stored electrical energy vary with the controller parameters and capacitance value. It is shown that the selected regenerative semiactive control system can store maximum energy in a capacitor in prescribed limiting time, along with the highest level of cylinder oscillation reduction which is the primary goal of current work.
Association of a Synthetic Bone Graft and Bone Marrow Cells as a Composite Biomaterial
S. M. Rabiee,S. M. J. Mortazavi,F. Moztarzadeh,D. Sharifi,F. Fakhrejahani,A. Khafaf,S. A. Houshiar Ahmadi,N. Nosoudi,R. Ravarian 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.1
Porous calcium phosphates have osteoconductive properties. The aim of this study was to obtain synthetic calcium phosphate bone graft substitute. X-ray diffraction was employed to investigate the formation of the beta-tricalcium phosphate (β-TCP) phase. We evaluated the effects of bone marrow on the osteoconductivity and mechanical properties of synthetic bone graft (SG). SG cylinders loaded with bone marrow (SGBM) and SG alone were implanted into rabbits femoral condyle bone defects. Histological examinations revealed the resorption of the SG, trabecular bone with osteoblasts and osteoid substance around the implants, and colonization inside the porous β-TCP by newly formed bone. Histomorphometry conducted after three months revealed the osteoid surface to be higher in SGBM than SG (p < 0.05). The compressive strengths of SG and SGBM were significantly higher than the anatomic control at all time periods. The elastic modulus of SBG and SGBM became weaker after implantation. The present results indicate that β-TCP is a good matrix for bone marrow, which contributes osteoinductive properties in an orthotopic. The composite biomaterial may be useful in reconstructive bone surgery.
Assessment of the core-catcher in the VVER-1000 reactor containment under various severe accidents
Salari Farhad,Rabiee Ataollah,Faghihi Farshad 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.1
The core catcher is used as a passive safety system in new generation nuclear power plants to create a space in the containment for the placing and cooling of the molten corium under various severe accidents. This research investigates the role of the core catcher in the VVER-1000 reactor containment system in mitigating the effects of core meltdown under various severe accidents within the context of the Ex-vessel Melt Retention (EVMR) strategy. Hence, a comparison study of three severe accidents is conducted, including Station Black-Out (SBO), SBO combined with the Large Break Loss of Coolant Accident (LB-LOCA), and SBO combined with the Small Break Loss of Coolant Accident (SB-LOCA). Numerical comparative simulations are performed for the aforementioned scenario with and without the EX-vessel core-catcher. The results showed that considering the EX-Vessel core catcher reduces the amount of hydrogen by about 18.2 percent in the case of SBO þ LB-LOCA, and hydrogen production decreases by 12.4 percent in the case of SBO þ SB-LOCA. Furthermore, in the presence of an EX-Vessel core-catcher, the production of gases such as CO and CO2 for the SBO accident is negligible. It was revealed that the greatest decrease in pressure and temperature of the containment is related to the SBO accident.