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A computational model of ureteral peristalsis and an investigation into ureteral reflux
G. Hosseini,C. Ji,D. Xu,M. A. Rezaienia,E. Avital,A. Munjiza,J. J. R. Williams,J. S. A. Green 대한의용생체공학회 2018 Biomedical Engineering Letters (BMEL) Vol.8 No.1
The aim of this study is to create a computationalmodel of the human ureteral system that accuratelyreplicates the peristaltic movement of the ureter for avariety of physiological and pathological functions. Theobjectives of this research are met using our in-house fluidstructuraldynamics code (CgLes–Y code). A realisticperistaltic motion of the ureter is modelled using a novelpiecewise linear force model. The urodynamic responsesare investigated under two conditions of a healthy and adepressed contraction force. A ureteral pressure during thecontraction shows a very good agreement with correspondingclinical data. The results also show a dependencyof the wall shear stresses on the contraction velocity and itconfirms the presence of a high shear stress at the proximalpart of the ureter. Additionally, it is shown that an inefficientlumen contraction can increase the possibility of acontinuous reflux during the propagation of peristalsis.
M. G. HOSSEINI AGHDAM,S. H. FATHI,G. B. GHAREHPETIAN 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
One of the major problems in electric power quality is the harmonic contents. There are several methods of indicating the quantity of harmonic contents. The most widely used measure is the total harmonic distortion (THD). This paper compares the two harmonic optimization techniques, optimal minimization of the total harmonic distortion (OMTHD) technique and optimized harmonic stepped-waveform (OHSW) technique used in multi-level voltage-source inverters. Both techniques are very effective and efficient for improving the quality of the inverter output voltage. First, we describe briefly the cascaded H-bridge multi-level inverter structure. Then, we present the switching algorithm for the inverter based on OHSW and OMTHD techniques. Finally, the results obtained by simulation for the two techniques are analyzed and compared. Simulation results verify the effectiveness of the both techniques in multi-level voltage-source inverter with non-equal DC sources, clarifying the advantages of each technique.
A Modular DC-DC Converter with Zero Voltage Switching Capability
Seyed Hossein Hosseini,Farzad Sedaghati,Mehran Sabahi,G. B. Gharehpetian 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
A Modular DC-DC converter with a high-frequency link and bidirectional power flow capability is presented in this paper. Zero voltage switching (ZVS) operation without using any auxiliary circuit, is one of the most important specifications of the proposed modular DC-DC converter. Also, compatibility for high power applications and less number of switching devices are the other merits of the proposed converter. ZVS analysis of the modular converters is necessary because of their high power applications and high number of power switches. The ZVS condition of the proposed modular DC-DC converter is studied and its criteria are derived in detail. The operation principle of the proposed converter, and its ZVS operation are verified using both simulation and experimental measurement.
C.K. How,Moonis Ali Khan,Soraya Hosseini,T.G. Chuah,Thomas S.Y. Choong 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
Carbon coating onto monolith through soft-template approach have been accomplished by means ofevaporative induced self-assembly (EISA). Variation in acid and alcohol content on monolith’s surfaceproperties was studied, while b-carotene was used as a modelled adsorbate. The pore architecture ofadsorbent samples was analysed through corresponding surface chemistry, N2 sorption isotherm, poresize distribution (PSD) plot, Brunauer–Emmett–Teller (BET), Barett–Joyner–Halenda (BJH) model andscanning electron microscopy (SEM). SEM images displayed a well-covered interconnected worm-likeframework of carbonaceous materials over monolith surface. Surface chemistry studies revealeddominance of acid functionalities over adsorbent samples surface, while basic functionalities remainunaltered. Carbon loading increased with increase in acid concentration, while it decreased withincrease in alcohol content. The adsorbent surface area decreased with increase in acid concentrationand alcohol content. The b-carotene adsorption capacities on synthesized samples varied between179.60 (optimum) and 112.56 mg/g (lower), respectively. Optimum b-carotene adsorption wasobserved on samples MC0.2 and MC5 with alcohol and acid content of 5 mL and 0.2 mL, respectively.
The estimation of absorbed dose rates for non-human biota: an extended intercomparison
Vives i Batlle, J.,Beaugelin-Seiller, K.,Beresford, N. A.,Copplestone, D.,Horyna, J.,Hosseini, A.,Johansen, M.,Kamboj, S.,Keum, D.-K.,Kurosawa, N.,Newsome, L.,Olyslaegers, G.,Vandenhove, H.,Ryufuku, S Springer-Verlag 2011 Radiation and environmental biophysics Vol.50 No.2