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Abolfazl Lakdashti,Hossein Ajorloo 한국전자통신연구원 2011 ETRI Journal Vol.33 No.2
To enable a relevance feedback paradigm to evolve itself by users’ feedback, a reinforcement learning method is proposed. The feature space of the medical images is partitioned into positive and negative hypercubes by the system. Each hypercube constitutes an individual in a genetic algorithm infrastructure. The rules take recombination and mutation operators to make new rules for better exploring the feature space. The effectiveness of the rules is checked by a scoring method by which the ineffective rules will be omitted gradually and the effective ones survive. Our experiments on a set of 10,004 images from the IRMA database show that the proposed approach can better describe the semantic content of images for image retrieval with respect to other existing approaches in the literature.
Abolfazl Arabpour,Mohammad Reza Besmi,Pouria Maghouli 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.3
This paper presents an approximated AC model for simultaneous transmission expansion planning (TEP) and reactive power planning by considering wind power investment. Since the full AC-TEP problem is still challenging to solve due to its nonconvexity, a linearized model, by means of special ordered set of type 2, is used to represent the mathematical model of the network. The objective function of our problem is considered to be the annualized investment cost of transmission lines, reactive power resources and wind power plants as well as the operation cost of production of electricity and reactive power resources. Wind and load uncertainties are handled by scenario generation. The K-means clustering technique is employed in order to reduce the number of scenarios. The presented work is applied to the 6-bus Garver’s power system, the 24-bus IEEE RTS and the 118-bus IEEE power system. These three diff erent examples illustrate the characteristics of the method. The results and the provided discussions clearly show the eff ectiveness and robustness as well as the computational effi ciency of the proposed stochastic co-planning framework.
Abolfazl Mahyar,Parviz Ayazi,Shiva Mavadati,Sonia Oveisi,Morteza Habibi,Shiva Esmaeily 대한비뇨의학회 2014 Investigative and Clinical Urology Vol.55 No.8
Purpose: This study was conducted to determine the predictive value of clinical, laboratory,and imaging variables for the diagnosis of vesicoureteral reflux in children withtheir first febrile urinary tract infection. Materials and Methods: One hundred fifty-three children with their first febrile urinarytract infection were divided into two groups according to the results of voiding cystourethrography:60 children with vesicoureteral reflux and 93 children without. Thesensitivity, specificity, positive and negative predictive value, likelihood ratio (positiveand negative), and accuracy of the clinical, laboratory, and imaging variables for thediagnosis of vesicoureteral reflux were determined. Results: Of the 153 children with febrile urinary tract infection, 60 patients (39.2%)had vesicoureteral reflux. There were significant differences between the two groupsregarding fever>38oC, suprapubic pain, C-reactive protein quantitative level, numberof red blood cells in the urine, and results of renal ultrasound and dimercaptosuccinicacid renal scanning (p<0.05). There were significant positive correlations between fever>38.2oC and dimercaptosuccinic acid renal scanning and vesicoureteral reflux. Also, there were significant positive correlations between the erythrocyte sedimentationrate, positive urinary nitrite test, hyaline cast, and renal ultrasound andhigh-grade vesicoureteral reflux. Conclusions: This study revealed fever>38.2oC and dimercaptosuccinic acid renalscanning as the best predictive markers for vesicoureteral reflux in children with theirfirst febrile urinary tract infection. In addition, erythrocyte sedimentation rate, positiveurinary nitrite test, hyaline cast, and renal ultrasound are the best predictivemarkers for high-grade vesicoureteral reflux.
Serum interleukin-1beta and tumor necrosis factor-alpha in febrile seizures: is there a link?
Abolfazl Mahyar,Parviz Ayazi,Reza Orangpour,Mohammad Mahdi Daneshi-Kohan,Mohammad Reza Sarokhani,Amir Javadi,Mousa Talebi-Bakhshayesh 대한소아청소년과학회 2014 Clinical and Experimental Pediatrics (CEP) Vol.57 No.10
Purpose: Febrile seizures are induced by fever and are the most common type of seizures in children. Although numerous studies have been performed on febrile seizures, their pathophysiology remainsunclear. Recent studies have shown that cytokines may play a role in the pathogenesis of febrileseizures. The present study was conducted to identify potential links between serum interleukin-1beta(IL-1β), tumor necrosis factor-alpha (TNF-α), and febrile seizures. Methods: Ninety-two patients with simple or complex febrile seizures (46 patients per seizure type),and 46 controls with comparable age, sex, and severity of temperature were enrolled. Results: The median concentrations of serum IL-1β in the simple, complex febrile seizure, and controlgroups were 0.05, 0.1, and 0.67 pg/mL, respectively (P=0.001). Moreover, the median concentrationsof TNF-α in the simple, complex febrile seizure, and control groups were 2.5, 1, and 61.5 pg/mL,respectively (P=0.001). Furthermore, there were significant differences between the case groups inserum IL-1β and TNF-α levels (P<0.05). Conclusion: Unlike previous studies, our study does not support the hypothesis that increased IL-1βand TNF-α production is involved in the pathogenesis of febrile seizures.
Abolfazl Koolivand,Mojtaba Yari,Saeed Khalaji,Arjan Jonker 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.4
Objective: Phosphorous (P) sources with greater bioavailability might increase animal production efficiency and decrease environmental pollution. The objective of current study was to determine animal performance, nutrient digestibility, blood metabolites and fecal P concentration in finishing lambs fed a diet with either di-calcium phosphate (DCP) or di-ammonium phosphate (DAP) as a P source. Methods: Twelve 4-month-old male lambs (initial body weight 24.87±3.4 kg) were randomly allocated to a diet with either DCP or DAP (~261 g/kg of total diet P) fed ad libitum for 93 days. Diets were iso-nitrogenous and iso-energetic and had same calcium (Ca) and P concentrations. Results: The DAP contained 19.7 g/kg of dry matter (DM) Ca, 185.4 g/kg DM P and 14,623 ppm fluorine, while DCP contained 230.3 g/kg DM Ca, 195.2 g/kg DM P and 1,039 ppm fluorine. The diet with DAP contained 60 ppm fluorine while the diet with DCP contained 13 ppm fluorine. Lambs fed the diet with DAP tended to have a greater daily DM intake compared to those fed diet with DCP (p = 0.09). Lambs fed DAP had greater plasma P concentration and alkaline phosphatase activity (p≤0.01) compared with lambs fed DCP. Dry matter and organic matter digestibility of the diets were similar between two treatments at days 60 and 90, while they were greater in lambs fed DCP (p<0.05) at day 30 of the trial. Feeding DAP increased P digestibility (58.7% vs 50.2%; p<0.05) and decreased fecal P concentration in lambs compared with feeding DCP (3.1 vs 3.8 g/kg DM; p<0.05). Conclusion: Providing ~261 g/kg of total diet P as DAP in the diet of finishing lambs improved the bioavailability of P in the body and decreased excretion of P in feces without affecting lamb performance.
Game Based Traffic Exchange for Green Data Center Networks
Abolfazl Ghassemi,Pejman Goudarzi,Mohammad R. Mirsarraf,T. Aaron Gulliver 한국통신학회 2018 Journal of communications and networks Vol.20 No.1
In this paper, game theory models are proposed for theexchange of workload/traffic among data centers within a networkaccording to the availability of green energy resources at these centers. Both homogeneous and heterogeneous data centers are consideredso they can have similar or different traffic handling capabilities,respectively. This leads to a non-cooperative game modelfor homogeneous data centers while heterogeneous data centersform a cooperative game model to exchange their workload/traffic. Numerical results are presented which demonstrate a reduction inenergy costs using both models with a significant improvement inaverage utility for the data centers.
Abolfazl Jafari Natanzi,Gholamreza Soleimani Jafari,Reza Kolahchi 사단법인 한국계산역학회 2018 Computers and Concrete, An International Journal Vol.21 No.5
In this study, nonlinear vibration and stability of a polymeric pipe reinforced by single-walled carbon naotubes (SWCNTs) conveying fluid-nanoparticles mixture flow is investigated. The Characteristics of the equivalent composite are determined using Mori-Tanaka model considering agglomeration effects. The surrounding elastic medium is simulated by orthotropic visco-Pasternak medium. Employing nonlinear strains-displacements, stress-strain energy method the governing equations were derived using Hamilton's principal. Differential quadrature method (DQM) is used for obtaining the frequency and critical fluid velocity. The influence of volume percent of SWCNTs, agglomeration, geometrical parameters of pipe, viscoelastic foundation and fluid velocity are shown on the frequency and critical fluid velocity of pipe. Results showed the increasing volume percent of SWCNTs leads to higher frequency and critical fluid velocity.
Numerical and Experimental Investigation of Composite Steel Shear Wall with Opening
Abolfazl Arabzadeh,Hamid Reza Kazemi Nia Korrani 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.4
Shear walls are used in towers as lateral loading resistance. Composite steel shear wall (CSSW) because of high stiffness and deformability are widely used. This wall made of a thin steel plate with reinforced a concrete layer, which is attached to one or both sides of the steel plate. This system is similar to stiffened steel plate shear wall. The present experimental and numerical studies were focused on the effects of opening used as windows or doors in buildings on the CSSW behavior. Experimental studies results of one and three-story CSSWs with the scale of 1:3 are reported. In addition, the effects of opening size and location are insignificant on the composite steel shear walls behavior. Results showed that opening decrease CSSW strength. Opening at the sides and corners further reduces the resistance than Opening at the center.