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RISS 인기검색어
- 검색키워드
- 저자 : Hossein Saberi (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Application of artificial intelligence to magnetite-based magnetorheological fluids
Hossein Saberi,Ehsan Esmaeilnezhad,최형진 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.100 No.-
Magnetorheological (MR)fluids are intelligentfluids that change their state under a magneticfield andcan be extensively applied in several industries. In this study, a model was presented to predict the MRbehavioral trend of magnetite-based MRfluids using deep neural networks. The MR data of nine sampleswith several magnetite nanoparticle concentrations and different silicone oil viscosities were used fornetwork construction and testing; the aforementioned data were obtained under several magneticfieldstrengths. Seven samples were used for network training/testing within the training interval and twosamples were applied for evaluating the network accuracy outside the network training interval. Severalnetworks, such as the multi-layer perceptron (MLP), radial basis function, and adaptive neuro-fuzzyinference system, were employed, and the results were analyzed. The accuracy parameters (R2 and RMSE)of the MLP network for the training data (0.99625 and 0.00867) and test data (0.99130 and 0.01621), aswell as a comparison between the predicted and laboratory-measured results of the two samples thathad not been used in the modeling step, demonstrated the exceptional performance of the proposedmethod and an equation that was derived for predicting the shear stress. The latter equation enablesresearchers to achieve their needs without performing time-and cost-consuming MR tests in thelaboratory.
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Oloomi, Kaveh,Saberi, Eshaghali,Mokhtari, Hadi,Mokhtari Zonouzi, Hamid Reza,Nosrat, Ali,Nekoofar, Mohammad Hossein,Dummer, Paul Michael Howell The Korean Academy of Conservative Dentistry 2013 Restorative Dentistry & Endodontics Vol.38 No.3
Objectives: This study was performed to evaluate the effect of blood contamination on the compressive strength (CS) of Root MTA (RMTA) modified with Calcium chloride ($CaCl_2$) and Disodium hydrogen phosphate ($Na_2HPO_4$) as setting accelerators over time. Materials and Methods: A total of 110 cylindrical specimens of RMTA were divided into 6 experimental groups as follows: Group1, RMTA; Group 2, RMTA modified with $CaCl_2$ (RMTA-C); Group 3, RMTA modified with $Na_2HPO_4$ (RMTA-N); Group 4, RMTA contaminated with blood; Group 5, RMTA-C contaminated with blood; Group 6, RMTA-N contaminated with blood. The CS of specimens in all groups was evaluated after 3 hr, 24 hr, and 1 wk. In the modified groups (groups 2, 3, 5, and 6) the CS of five specimens per group was also evaluated after 1 hr. Results: Blood contamination significantly reduced the CS of all materials at all time intervals (p < 0.05). After 3 hr, the CS of specimens in the RMTA groups (with and without blood contamination) was significantly lower than those in the RMTA-C and RMTA-N groups (p < 0.05). The CS values were not significantly different at the other time intervals. In all groups, the CS of specimens significantly increased over time (p < 0.05). Conclusions: Blood contamination decreased the CS of both original and accelerated RMTA.
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Kaveh Oloomi,Eshaghali Saberi,Hadi Mokhtari,Hamid Reza Mokhtari Zonouzi,Ali Nosrat,Mohammad Hossein Nekoofar,Paul Michael Howell Dummer 大韓齒科保存學會 2013 Restorative Dentistry & Endodontics Vol.38 No.3
Objectives: This study was performed to evaluate the effect of blood contamination on the compressive strength (CS) of Root MTA (RMTA) modified with Calcium chloride (CaCl2) and Disodium hydrogen phosphate (Na2HPO4) as setting accelerators over time. Materials and Methods: A total of 110 cylindrical specimens of RMTA were divided into 6 experimental groups as follows: Group1, RMTA, Group 2, RMTA modified with CaCl2 (RMTA-C), Group 3, RMTA modified with Na2HPO4 (RMTA-N), Group 4, RMTA contaminated with blood, Group 5, RMTA-C contaminated with blood, Group 6, RMTA-N contaminated with blood. The CS of specimens in all groups was evaluated after 3hr, 24 hr, and 1 wk. In the modified groups (groups 2, 3, 5, and 6) the CS of five specimens per group was also evaluated after 1 hr. Results: Blood contamination significantly reduced the CS of all materials at all time intervals (p < 0.05). After 3hr, the CS of specimens in the RMTA groups (with and without blood contamination)was significantly lower than those in the RMTA-C and RMTA-N groups (p < 0.05). The CS values were not significantly different at the other time intervals. In all groups,the CS of specimens significantly increased over time (p < 0.05). Conclusions: Blood contamination decreased the CS of both original and accelerated RMTA.
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Kimiya Rastegari,Mokhtari-Dizaji Manijhe,Mohammad Hossein Harirchian,Hassan Hashemi,Niloofar Ayoobi Yazdi,Hazhir Saberi 대한초음파의학회 2023 ULTRASONOGRAPHY Vol.42 No.1
Purpose: Investigations of the hemodynamic changes of the venous system in patients with multiple sclerosis (MS) have shown contradictory results. Herein, the biomechanical parameters of the internal jugular vein (IJV) and common carotid artery (CCA) of MS patients were extracted and compared to healthy individuals. Methods: B-mode and Doppler sequential ultrasound images of 64 IJVs and CCAs of women including 22 healthy individuals, 22 relapsing-remitting multiple sclerosis (RRMS) patients, and 20 primary-progressive multiple sclerosis (PPMS) patients were recorded and processed. The biomechanical parameters of the IJV and the CCA walls during three cardiac cycles were calculated. Results: The IJV maximum and minimum pressures were higher in the MS patients than in the healthy subjects, by 31% and 19% in RRMS patients and 39% and 24% in PPMS patients. The venous wall thicknesses in RRMS and PPMS patients were 51% and 60% higher than in healthy subjects, respectively. IJV distensibility in RRMS and PPMS patients was 70% and 75% lower, and compliance was 40% and 59% lower than in healthy subjects. The maximum intima-media thicknesses of the CCAs were 38% and 24%, and the minimum intima-media thicknesses were 27% and 23% higher in RRMS and PPMS patients than in healthy individuals, respectively. The shear modulus of CCA walls in RRMS and PPMS patients was 17% and 31%, and the radial elastic moduli were 47% and 9% higher than in healthy individuals. Conclusion: Some physical and biomechanical parameters of the CCA and IJV showed significant differences between MS patients and healthy individuals.
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