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RISS 인기검색어
- 검색키워드
- 저자 : Shadravan, Shideh (검색결과 5 건)
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Shadravan, Shideh,Ramseyer, Chris C.,Floyd, Royce W. Techno-Press 2019 Advances in computational design Vol.4 No.3
This study performed lateral load testing on seventeen wood wall frames in two sections. Section one included eight tests studying structural foam sheathing of shear walls subjected to monotonic loads following the ASTM E564 test method. In this section, the wood frame was sheathed with four different types of structural foam sheathing on one side and gypsum wallboard (GWB) on the opposite side of the wall frame, with Simpson HDQ8 hold down anchors at the terminal studs. Section two included nine tests studying wall constructed with oriented strand board (OSB) only on one side of the wall frame subjected to gradually applied monotonic loads. Three of the OSB walls were tied to the baseplate with Simpson LSTA 9 tie on each stud. From the test results for Section one; the monotonic tests showed an 11 to 27 percent reduction in capacity from the published design values and for Section two; doubling baseplates, reducing anchor bolt spacing, using bearing plate washers and LSTA 9 ties effectively improved the OSB wall capacity. In comparison of sections one and two, it is expected the walls with structural foam sheathing without hold downs and GWB have a lower wall capacity as hold down and GWB improved the capacity.
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Shadravan, Shideh,Ramseyer, Chris C. Techno-Press 2019 Advances in computational design Vol.4 No.3
This study investigated the ultimate lateral load capacity of shear walls constructed with several types of structural foam sheathing. Sixteen tests were conducted and the results were compared to the published design values commutated by the manufactures for each test series. The sheathing products included 12.7 mm (1/2 in) SI-Strong, 25.4 mm (1 in) SI-Strong, 12.7 mm (1/2 in) R-Max Thermasheath, and 2 mm (0.078 in) ThermoPly Green. The structural foam sheathing was attached per the manufacturers' specification to one side of the wood frame for each wall tested. Standard 12.7 mm (1/2 in) gypsum wallboard was screwed to the opposite side of the frame. Simpson HDQ8 tie-down anchors were screwed to the terminal studs at each end of the wall and anchored to the base of the testing apparatus. Both monotonic and cyclic testing following ASTM E564 and ASTM E2126, respectively, were considered. Results from the monotonic tests showed an 11 to 27 percent smaller capacity when compared to the published design values. Likewise, the test results from the cyclic tests showed a 24 to 45 percent smaller capacity than the published design values and did not meet the seismic performance design criteria computation.
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Ali Shokuhi Rad,Arvin Shadravan,Amir Abbas Soleymani,Nazanin Motaghedi 한국물리학회 2015 Current Applied Physics Vol.15 No.10
We studied density functional theory (DFT) calculations in terms of energetic and electronic properties toward adsorption of some boron compounds (B(OCH3)3, BF3 and BC13) on the surface of pristine as well as N-doped graphene using WB97XD/6-31 + G(d,p) level of theory. The net charge transfer of mentioned molecules on the surface of pristine and N-doped graphene was calculated with above-mentioned basis set using natural bond orbital and Mulliken charge analysis during complex formation. The computed dipole moment shows when above-mentioned molecules approach to the surface of N-doped graphene, the amount of the dielectric (μD) will change depending on the kind of molecule. Our calculations reveal that N-doped graphene system has much higher adsorption energy, higher net charge transfer value than pristine graphene due to Lewis acid-base interaction. Comparing B(OCH3)3 as an organic boron derivative with boron trihalides (BF3 and BCl3), the Lewis acidity increases in the order of BF3 < BC13< B(OCH3)3 with adsorption energies (Eads) of -8.7, -18.3 and -26.5 kJ/mol (BSSE) respectively, while low adsorption energies were calculated on pristine graphene for mentioned molecules.
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Retinopathy of Prematurity-assist: Novel Software for Detecting Plus Disease
Elias Khalili Pour,Hamidreza Pourreza,Kambiz Ameli Zamani,Alireza Mahmoudi,Arash Mir Mohammad Sadeghi,Mahla Shadravan,Reza Karkhaneh,Ramak Rouhi Pour,Mohammad Riazi Esfahani 대한안과학회 2017 Korean Journal of Ophthalmology Vol.31 No.6
Purpose: To design software with a novel algorithm, which analyzes the tortuosity and vascular dilatation infundal images of retinopathy of prematurity (ROP) patients with an acceptable accuracy for detecting plus disease. Methods: Eighty-seven well-focused fundal images taken with RetCam were classified to three groups of plus,non-plus, and pre-plus by agreement between three ROP experts. Automated algorithms in this study weredesigned based on two methods: the curvature measure and distance transform for assessment of tortuosityand vascular dilatation, respectively as two major parameters of plus disease detection. Results: Thirty-eight plus, 12 pre-plus, and 37 non-plus images, which were classified by three experts, weretested by an automated algorithm and software evaluated the correct grouping of images in comparison toexpert voting with three different classifiers, k-nearest neighbor, support vector machine and multilayer perceptronnetwork. The plus, pre-plus, and non-plus images were analyzed with 72.3%, 83.7%, and 84.4%accuracy, respectively. Conclusions: The new automated algorithm used in this pilot scheme for diagnosis and screening of patientswith plus ROP has acceptable accuracy. With more improvements, it may become particularly useful, especiallyin centers without a skilled person in the ROP field.
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