Effect of LiF addition on the sinterability, crystal structure and microwave dielectric properties of Li3Mg4NbO8 ceramics

Wei Jin,Jingjing Tan,Jiaxin Yan,Yao Tao,Ningning Yao,Xiaomeng Ruan,Cuijin Pei 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.6

The normative solid-state reaction process was adopted to prepare Li3Mg4NbO8 ceramics with LiF addition. We investigatedthe impacts of LiF additive on the crystal structure, sinterabillity as well as dielectric performance at microwave region of theLi3Mg4NbO8-basic ceramics. XRD analysis confirmed that the addition of LiF to Li3Mg4NbO8 lead to the formation of newphase Li4Mg4NbO8F with cubic rock salt structure. The densified temperature of Li3Mg4NbO8-basic ceramics could beeffectively reduced from 1150 oC to 900 oC with LiF addition. Both the permitivity (εr) and quality factor (Qf) of presentceramics were is closely correlated with the bulk density and cell volume. The 900 oC-sintered Li3Mg4NbO8-basic ceramicsowned excellent chemical compatibility with silver and optimized microwave dielectric performance (εr ~13. 4, Qf ~ 32,400GHz at 9.4 GHz, and temperature coefficient of resonant frequency (τf) ~ -43.0 ppm/℃).

The Antioxidant Property of Chitosan Green Tea Polyphenols Complex Induces Transglutaminase Activation in Wound Healing

Yao Qin,Xing Wei Guo,Lei Li,Hong Wei Wang,김욱 한국식품영양과학회 2013 Journal of medicinal food Vol.16 No.6

The present study examined, for the first time, the in vitro wound healing potential of chitosan green tea polyphenols (CGP) complex based on the activation of transglutaminase (TGM) genes in epidermal morphogenesis. Response surface methodology was applied to determine the optimal processing condition that gave maximum extraction of green tea polyphenols. The antioxidant activity, scavenging ability, and chelating ability were studied and expressed as average EC50 values of CGP and other treatments. In silico analysis and gene coexpression network was subjected to the TGM sequences analysis. The temporal expressions of TGMs were profiled by semi-quantitative reverse transcription (RT)-PCR technology within 10 days after wounding and 2 days postwounding. CGP showed the effectiveness of antioxidant properties, and the observations of histopathological photography showed advanced tissue granulation and epithelialization formation by CGP treatment. In silico and coexpression analysis confirmed the regulation via TGM gene family in dermatological tissues. RTPCR demonstrated increased levels of TGM1–3 expression induced by CGP treatment. The efficacy of CGP in wound healing based on these results may be ascribed to its antioxidant properties and activation of the expression of TGMs, and is, thus, essential for the facilitated repair of skin injury.

M-SCOTT CONVERGENCE AND M-SCOTT TOPOLOGY ON POSETS

Yao, Wei The Honam Mathematical Society 2011 호남수학학술지 Vol.33 No.2

For a subset system M on any poset, M-Scott notions, such as M-way below relation,M-continuity,M-Scott convergence (of nets and filters respectively) and M-Scott topology are proposed Any approximating auxiliary relation on a poset can be represented by an M-way below relation such that this poset is M-continuous. It is shown that a poset is M-continuous iff the M-Scott topology is completely distributive. The topology induced by the M-Scott convergence coincides with the M-Scott topology. If the M-way below relation satisfies the property of interpolation then a poset is M-continuous if and only if the M-Scott convergence coincides with the M-Scott topological convergence. Also, M-continuity is characterized by a certain Galois connection.

A Fast Rough Mode Decision Algorithm for HEVC

Wei-Xin Yao,Dan Yang,Gui-Fu Lu,Jun Wang 한국정보처리학회 2019 Journal of information processing systems Vol.15 No.3

HEVC is the high efficiency video coding standard, which provides better coding efficiency contrasted with theother video coding standard. But at the same time the computational complexity increases drastically. Thirtyfivekinds of intra-prediction modes are defined in HEVC, while 9 kinds of intra prediction modes are definedin H.264/AVC. This paper proposes a fast rough mode decision (RMD) algorithm which adopts the smoothnessof the up-reference pixels and the left-reference pixels to decrease the computational complexity. The three stepsearch method is implemented in RMD process. The experimental results compared with HM13.0 indicate thatthe proposed algorithm can save 39.7% of the encoding time, while Bjontegaard delta bitrate (BDBR) isincreased slightly by 1.35% and Bjontegaard delta peak signal-to-noise ratio (BDPSNR) loss is negligible.

A Fast Inter-prediction Mode Decision Algorithm for HEVC Based on Spatial-Temporal Correlation

Wei-Xin Yao,Dan Yang 한국정보처리학회 2022 Journal of information processing systems Vol.18 No.2

Many new techniques have been adopted in HEVC (High efficiency video coding) standard, such as quadtreestructuredcoding unit (CU), prediction unit (PU) partition, 35 intra-mode, and so on. To reduce computationalcomplexity, the paper proposes two optimization algorithms which include fast CU depth range decision andfast PU partition mode decision. Firstly, depth range of CU is predicted according to spatial-temporalcorrelation. Secondly, we utilize the depth difference between the current CU and CU corresponding to thesame position of adjacent frame for PU mode range selection. The number of traversal candidate modes isreduced. The experiment result shows the proposed algorithm obtains a lot of time reducing, and the loss ofcoding efficiency is inappreciable.

Electric Pulse Induced Impedance and Material Degradation in IC Chip Packaging

Wei Yao,Cemal Basaran 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.5

A method for measurement of electric circuit conduction path by Scan Electron Microscopy (SEM) has been developed. It shows that current conducts through the whole surface layer of solder joints when subjected to high frequency pulse loadings, but only half of the surface layer when subjected to AC loading. The Electrical Pulse Induced Resistance Change (EPIR) profile of a symmetric solder bump thin film structure of a typical IC chips packaging is studied. EPIR is found to be frequency, duty factor and current density dependent. An average current density model is proposed to approximate duty factor and the current density induced EPIR effects.

An Improved Integrative Transformation System for Pichia pastoris with DNA-polyethylenimine-dextran Sulfate Nanoparticles

Wei Xue,Hang Wang,Zuodi Pei,Wei Zhao,Yong-Sheng Tian,Ri-He Peng,Quan-Hong Yao 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.3

Pichia pastoris is a suitable host for selecting mutant enzymes, since it can secret many gene products to the medium. However, poor transformation efficiency is often encountered. This makes it difficult to obtain a large number of transformants necessary to thoroughly cover a large library. We report here that pre-coating DNA with polyethyleneimine and dextran sulfate increased gene integration significantly in Pichia electroporation. This improvement on integrative efficiency has been proved in different voltage, resistance, cell phase, and DNA concentrations. The condensed DNA nanoparticles make Pichia available as a host for screening large libraries of random mutants.

Damping of Inter-Area Low Frequency Oscillation Using an Adaptive Wide-Area Damping Controller

Wei Yao,L. Jiang,Jiakun Fang,Jinyu Wen,Shaorong Wang 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.1

This paper presents an adaptive wide-area damping controller (WADC) based on generalized predictive control (GPC) and model identification for damping the inter-area low frequency oscillations in large-scale inter-connected power system. A recursive least-squares algorithm (RLSA) with a varying forgetting factor is applied to identify online the reduced-order linearlized model which contains dominant inter-area low frequency oscillations. Based on this linearlized model, the generalized predictive control scheme considering control output constraints is employed to obtain the optimal control signal in each sampling interval. Case studies are undertaken on a two-area fourmachine power system and the New England 10-machine 39-bus power system, respectively. Simulation results show that the proposed adaptive WADC not only can damp the inter-area oscillations effectively under a wide range of operation conditions and different disturbances, but also has better robustness against to the time delay existing in the remote signals. The comparison studies with the conventional lead-lag WADC are also provided.

Virtual boundary element-equivalent collocation method for the plane magnetoelectroelastic solids

Yao, Wei-An,Li, Xiao-Chuan,Yu, Gui-Rong Techno-Press 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.22 No.1

This paper presents a virtual boundary element-equivalent collocation method (VBEM) for the plane magnetoelectroelastic solids, which is based on the fundamental solutions of the plane magnetoelectroelastic solids and the basic idea of the virtual boundary element method for elasticity. Besides all the advantages of the conventional boundary element method (BEM) over domain discretization methods, this method avoids the computation of singular integral on the boundary by introducing the virtual boundary. In the end, several numerical examples are performed to demonstrate the performance of this method, and the results show that they agree well with the exact solutions. So the method is one of the efficient numerical methods used to analyze megnatoelectroelastic solids.

Metagenomics analysis of the gut microbiome in healthy and bacterial pneumonia forest musk deer

Wei Zhao,Ziwei Ren,Yan Luo,Jianguo Cheng,Jie Wang,Yin Wang,Zexiao Yang,Xueping Yao,Zhijun Zhong,Wei Yang,Xi Wu 한국유전학회 2021 Genes & Genomics Vol.43 No.1

Background The forest musk deer (FMD, Moschus berezovskii) is an threatened species in China. Bacterial pneumonia was found to seriously restrict the development of FMD captive breeding. Historical evidence has demonstrated the relationship between immune system and intestinal Lactobacillus in FMD. Objective We sought to elucidate the diferences in the gut microbiota of healthy and bacterial pneumonia FMD. Methods The bacterial pneumonia FMD was demonstrated by bacterial and pathological diagnosis, and the gut microbiome of healthy and bacterial pneumonia FMD was sequenced and analysed. Results There are three pathogens (Pseudomonas aeruginosa, Streptococcus equinus and Trueperella pyogenes) isolated from the bacterial pneumonia FMD individuals. Compared with the healthy group, the abundance of Firmicutes and Proteobacteria in the pneumonia group was changed, and a high level of Proteobacteria was found in the pneumonia group. In addition, a higher abundance of Acinetobacter (p=0.01) was observed in the population of the pneumonia group compared with the healthy group. Several potentially harmful bacteria and disease-related KEGG subsystems were only found in the gut of the bacterial pneumonia group. Analysis of KEGG revealed that many genes related to type IV secretion system, type IV pilus, lipopolysaccharide export system, HTH-type transcriptional regulator/antitoxin MqsA, and ArsR family transcriptional regulator were signifcantly enriched in the metagenome of the bacterial pneumonia FMD. Conclusion Our results demonstrated that the gut microbiome was signifcantly altered in the bacterial pneumonia group. Overall, our research improves the understanding of the potential role of the gut microbiota in the FMD bacterial pneumonia.