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Controller and sensor placement for a 3D irregular building based on Hankel norm
Yumei Wang,Shirley J. Dyke 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.28 No.5
Placing controllers and sensors properly is important in structural health monitoring and control. Many optimization methods require much computation efforts. This paper used Hankel norms to develop the placement rules, because they involve the input and output gains and thus could be shaped by the locations. In modal form, their computations are relatively simple. The location and mode influences on norms were arranged in rows and columns, respectively, to form a matrix, and was normalized by the column (mode) root mean square. The optimization goal is to choose locations with higher index values and lower correlations to ensure higher controllability and observability, and with less effort to be compensated for by gains. Hankel norm is compatible with the LQR control objectives in that they are both 2-norm, so the methodology is appropriate to be applied to the base isolation benchmark building for structural control, which is an eight-story irregular building with ninety-two candidate locations for controllers and thirty-six locations for sensors. Following the method, ten controller locations and eighteen sensor locations were determined. Earthquake time history analysis using LQG technique validated the effectiveness of thus determined subset of locations by comparing with other subset of locations.
Synthesis of Uniform Polyaniline Nanosheets and Nanotubes: Dependence of Morphology on the pH
Yumei Zhang,Chengfu Dou,Wenping Wang,Qiang Wang,Ningchuan Feng 한국고분자학회 2016 Macromolecular Research Vol.24 No.8
Polyaniline (PANI) nanomaterials were synthesized by simplified template-free method with ammonium persulfate (APS) as an oxidant. The strong dependence of morphology of polyaniline on the initial pH of the reaction solution has been found. PANI morphology transformed from nanosheets to nanotubes with the decreasing initial pH from 6.70~6.50 to 5.30~5.00, and nanotubes changed further to irregular granules with the decreasing pH lower than 2.26. Polyaniline nanosheets were highly crystalline (2θ=6.2°) but poor in conductivity (5.7×10-5 S/cm) and electroactivity due to low doping level. Though polyaniline nanotubes were poorly crystalline, it had a relative high conductivity (3.4×10-2 S/cm) and maintained the electroactivity in acidic and neutral media which had potential applications in biomedical fields such as tissue engineering and biosensor.
Yumei Li,Rui Zhao,Xiang Li,Chuying Wang,Huiwei Bao,Shudan Wang,Jing Fang,Jinqiu Huang,Ce Wang 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2
The endothelialization and anti-thrombotic abilities of tissue engineered vascular scaffolds are considered to be effective properties for improving the performance small-caliber vascular scaffolds. For this purpose, we designed and developed electrically conductive fibrous scaffolds based on polyaniline coated polyurethane (PANI-PU) electrospun fibersfor vascular tissue engineering applications. The porosity of PANI-PU fibers was 75.27±2.04 %. The obtained PANI-PU fibers were characterized by SEM observations, XPS analysis, water contact angle (WCA) measurement and mechanical property. The PANI functionalization aimed to improve the performance of anticoagulation and endothelialization. The WCA of PAIN-PU decreased to 35 o from 135 o of PU fibers. Blood compatibility and cytocompatibility were compared before and after PANI coating. The adhered platelet cells on PANI-PU was 6.87×105/cm2 and plasma recalcification time was 123 s. Platelet adhesion and plasma recalcification time test showed that the PANI-PU scaffolds had a certain anticoagulant effect. The hemolysis rate of PANI-PU fibers was 0.14 %, which showed that the PANI-PU scaffolds could be used as blood contact materials. The observation of endothelial cell proliferation and morphology in human umbilical vein endothelial cells showed that PANI-PU fibers were more beneficial to cell adhesion, proliferation and extension than that of PU fibers. The results demonstrates the PANI coated electrospun PU fibers have great potential in application as small-diameter vascular grafts and this work shows new insights into conductive scaffolds for vascular tissue engineering.
Cloning and Characterization of the IgA Fc Receptor from Swine
( Yumei Chen ),( Yunchao Liu ),( Gaiping Zhang ),( Hua Feng ),( Pengchao Ji ),( Guoqiang Wang ),( Chang Liu ),( Yapeng Song ),( Yunfang Su ),( Songlin Qiao ),( Aiping Wang ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.12
The myeloid-specific IgA Fc receptor (FcαR) is a cell surface molecule on immunocytes that provides a fundamental connection between humoral and cellular immunity. In this study, the full-length cDNA sequence of swine FcαRI (swFcαRI) was isolated and characterized and found to contain a 792-base-pair open reading frame, encoding a 264-amino-acid transmembrane glycoprotein with a predicted molecular mass of 29.4 kDa. The swFcαRI shares high amino acid sequence homology (>50%) with its counterparts from cattle, seal, and horse. Rosetting analysis confirmed that COS-7 cells transfected with an swFcαRI expression plasmid was able to combine with chicken erythrocytes sensitized with porcine IgA, but not IgG.
Enhanced Giant Magnetoelectric Effect in Laminate Composites of FeCuNbSiB/FeNi/PZT
Yumei Wen,Dong Wang,Ping Li 한국자기학회 2011 Journal of Magnetics Vol.16 No.4
A novel laminate composite of FeCuNbSiB/FeNi /PZT is proposed, where FeCuNbSiB has a permeability of around 100000, which is much larger than that of FeNi. The high-permeability FeCuNbSiB was laminated with piezomagnetic FeNi rather than attached to its ends. It is expected that the effect produced by the high permeability will act on the whole of the piezomagnetic layer. While a FeNi layer was laminated with a FeCuNbSiB layer, the strong demagnetization produced by the latter was expected to be imposed on the FeNi layer as well as the applied fields. The distribution of applied fields was altered by the high-permeability material (both bias and ac field) and the field variation positively contributed to the ME effect in piezomagnetic/piezoelectric composites. Thus the ME voltage coefficient along with the field sensitivity were improved.
Research on crack behavior of recycled concrete beams under short-term loading
Zhiheng Deng,Yumei Wang,Haifeng Yang,Jian Qian 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.5
An experimental investigation was conducted to study the crack behavior of beams constructed with Recycled Concrete Aggregate(RCA). This experimental program consisted of 16 beams. The test parameters for this study include RCA replacement ratio andlongitudinal reinforcement ratio. The flexural properties and crack behaviors of the beams were evaluated based on present designcodes. It is found that the use of RCA does not cause an observable change in the progression of flexural strength and crack pattern. However, results of these statistical tests show that the RCA beams possess a larger crack width compares with the conventionalbeams.