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Search Results: 1 - 10 of 24364 matches for " Yongqiang Jiang "
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On the Eigenvalue of $p(x)$-Laplace Equation
Yushan Jiang,Yongqiang Fu
Mathematics , 2011,
Abstract: The main purpose of this paper is to show that there exists a positive number $\lambda_{1}$, the first eigenvalue, such that some $p(x)$-Laplace equation admits a solution if $\lambda=\lambda_{1}$ and that $\lambda_{1}$ is simple, i.e., with respect to \textit{the first eigenvalue} solutions, which are not equal to zero a. e., of the $p(x)$-Laplace equation forms an one dimensional subset. Furthermore, by developing Moser method we obtained some results concerning H\"{o}lder continuity and bounded properties of the solutions. Our works are done in the setting of the Generalized-Sobolev Space. There are many perfect results about $p$-Laplace equations, but about $p(x)$-Laplace equation there are few results. The main reason is that a lot of methods which are very useful in dealing with $p$-Laplace equations are no longer valid for $p(x)$-Laplace equations. In this paper, many results are obtained by imposing some conditions on $p(x)$. Stimulated by the development of the study of elastic mechanics, interest in variational problems and differential equations has grown in recent decades, while Laplace equations with nonstandard growth conditions share a part. The equation discussed in this paper is derived from the elastic mechanics.
A Study on the Dynamic Mechanism of the Formation of Mesoscale Vortex in Col Field

JIANG Yongqiang,WANG Yuan,HUANG Hong,

大气科学进展 , 2012,
Abstract: The mesoscale vortex associated with a mesoscale low-level jet (mLLJ) usually causes heavy rainfall in the col field. The col field is defined as a region between two highs and two lows, with the isobaric surface similar to a col. Using a two-dimensional shallow water model, the meso-β scale vortex couplets (MβVCs) induced by eight types of mesoscale wind perturbations in an ideal col field were numerically simulated. With the sizes of ~100 km, the MβVCs induced by northerly perturbation (NP) and southerly perturbation (SP) moved toward the col point. The sizes of MβVCs induced by southwesterly perturbation (SWP), southeasterly perturbation (SEP), northwesterly perturbation (NWP), and northeasterly perturbation (NEP) were relatively small for the perturbations moving toward dilatation axis. The MβVC induced by easterly perturbation (EP) and westerly perturbation (WP) could not develop because they quickly moved away from the col point, before the circulation could form. The size of the circulation was determined by the distance between the vortex and the col point. The closer to the col point the vortex was, the larger the size of vortex. The comparisons of maximum vorticity and vorticity root mean square error (RMSE) of the NP, the SWP, and the WP show that the maximum vorticity and the vorticity RMSE of the NP decreased slower than other perturbations. Therefore, the weak environment of the col field favors the maintenance of vorticity and the formation of vortex. When a mesoscale vortex forms near the col point or moves toward the col point, it may maintain a quasi-stationary state in the stable col field.
Knowledge-based Video Quality Guarantee Model and Simulation
基于知识系统的视频服务质量保障模型及仿真

LI Yongqiang,ZHU Jiang,
李永强
,朱 江

中国图象图形学报 , 2010,
Abstract: To ensure the video QoS(quality of service) of the Web, DiffServ(differentiated service) methods are always used at the edge of network. Current label system of DiffServ is static and not so intelligent. In order to solve this problem and improve the Subject QoS, knowledge-system-based video quality guarantee model is provided and a system is built. In this system, the video adaptation is guided intelligently with the knowledge acquired at different phases of knowledge creation processes and (m,k) model is applied in label design so as to mapping to knowledge. Testing results have shown this model can satisfy the user preference and ensure video quality effectively. So it is proved that knowledge plays an important role and brings more intelligence to our system.
On Optimizing H. 264/AVC Rate Control by Improving R-D Model and Incorporating HVS Characteristics
Zhongjie Zhu,Yuer Wang,Yongqiang Bai,Gangyi Jiang
EURASIP Journal on Advances in Signal Processing , 2010, DOI: 10.1155/2010/830605
Abstract:
On Optimizing H. 264/AVC Rate Control by Improving R-D Model and Incorporating HVS Characteristics
Zhu Zhongjie,Wang Yuer,Bai Yongqiang,Jiang Gangyi
EURASIP Journal on Advances in Signal Processing , 2010,
Abstract: The state-of-the-art JVT-G012 rate control algorithm of H.264 is improved from two aspects. First, the quadratic rate-distortion (R-D) model is modified based on both empirical observations and theoretical analysis. Second, based on the existing physiological and psychological research findings of human vision, the rate control algorithm is optimized by incorporating the main characteristics of the human visual system (HVS) such as contrast sensitivity, multichannel theory, and masking effect. Experiments are conducted, and experimental results show that the improved algorithm can simultaneously enhance the overall subjective visual quality and improve the rate control precision effectively.
CD109 Plays a Role in Osteoclastogenesis
Yongqiang Wang, Maayan Inger, Hongwei Jiang, Howard Tenenbaum, Michael Glogauer
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0061213
Abstract: Osteoclasts are large multinucleated cells that arise from the fusion of cells from the monocyte/macrophage lineage. Osteoclastogenesis is mediated by macrophage colony-stimulating factor (M-CSF) and receptor activator of nuclear factor-kB ligand (RANKL) and involves a complex multistep process that requires numerous other elements, many of which remain undefined. The primary aim of this project was to identify novel factors which regulate osteoclastogenesis. To carry out this investigation, microarray analysis was performed comparing two pre-osteoclast cell lines generated from RAW264.7 macrophages: one that has the capacity to fuse forming large multinucleated cells and one that does not fuse. It was found that CD109 was up-regulated by>17-fold in the osteoclast forming cell line when compared to the cell line that does not fuse, at day 2 of the differentiation process. Results obtained with microarray were confirmed by RT-qPCR and Western blot analyses in the two cell lines, in the parental RAW264.7 cell line, as well as primary murine monocytes from bone marrow. A significant increase of CD109 mRNA and protein expression during osteoclastogenesis occurred in all tested cell types. In order to characterize the role of CD109 in osteoclastogenesis, CD109 stable knockdown cell lines were established and fusion of osteoclast precursors into osteoclasts was assessed. It was found that CD109 knockdown cell lines were less capable of forming large multinucleated osteoclasts. It has been shown here that CD109 is expressed in monocytes undergoing RANKL-induced osteoclastogenesis. Moreover, when CD109 expression is suppressed in vitro, osteoclast formation decreases. This suggests that CD109 might be an important regulator of osteoclastogenesis. Further research is needed in order to characterize the role played by CD109 in regulation of osteoclast differentiation.
Identification and Cluster Analysis of Streptococcus pyogenes by MALDI-TOF Mass Spectrometry
Jie Wang, Na Zhou, Bin Xu, Huaijie Hao, Lin Kang, Yuling Zheng, Yongqiang Jiang, Hua Jiang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0047152
Abstract: Background Whole-cell matrix–assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry (MS) has been successfully applied for bacterial identification and typing of many pathogens. The fast and reliable qualities of MALDI-TOF MS make it suitable for clinical diagnostics. MALDI-TOF MS for the identification and cluster analysis of Streptococcus pyogenes, however, has not been reported. The goal of our study was to evaluate this approach for the rapid identification and typing of S. pyogenes. Methods 65 S. pyogenes isolates were obtained from the hospital. The samples were prepared and MALDI-TOF MS measurements were conducted as previously reported. Identification of unknown spectra was performed via a pattern recognition algorithm with a reference spectra and a dendrogram was constructed using the statistical toolbox in Matlab 7.1 integrated in the MALDI Biotyper 2.0 software. Results For identification, 61 of 65 S. pyogenes isolates could be identified correctly by MALDI-TOF MS with BioType 2.0 when compared to biochemical identification (API Strep), with an accuracy of 93.85%. In clustering analysis, 44 of 65 isolates were in accordance with those established by M typing, with a matching rate of 67.69%. When only the M type prevalence in China was considered, 41 of 45 isolates were in agreement with M typing, with a matching rate of 91.1%. Conclusions It was here shown that MALDI-TOF MS with Soft Biotype 2.0 and its database could facilitate rapid identification of S. pyogenes. It may present an attractive alternative to traditional biochemical methods of identification. However, for classification, more isolates and advances in the MALDI-TOF MS technology are needed to improve accuracy.
The Magnetic Properties of Zn0.98Fe0.02O with Additional Cu Doping  [PDF]
Tongqin Chang, Yongqiang Wang
World Journal of Engineering and Technology (WJET) , 2014, DOI: 10.4236/wjet.2014.23019
Abstract: Samples Zn0.98Fe0.02O doped with additional Cu have been fabricated by a coprecipitation method. It is found that Zn0.98Fe0.02O without additional doping shows weak ferromagnetism at room temperature. The Cu doping has induced a light increase of magnetization in low temperature of 10 K. This result is consistent with bound magnetic polaron model relative to holes.
Note on Cyclically Interval Edge Colorings of Simple Cycles  [PDF]
Nannan Wang, Yongqiang Zhao
Open Journal of Discrete Mathematics (OJDM) , 2016, DOI: 10.4236/ojdm.2016.63016
Abstract: A proper edge t-coloring of a graph G is a coloring of its edges with colors ?1, 2,..., t,?such that all colors are used, and no two adjacent edges receive the same color. A cyclically interval t-coloring of a graph G is a proper edge t-coloring of G such that for each vertex\"\", either the set of colors used on edges incident to x or the set of colors not used on edges incident to x forms an interval of integers. In this paper, we provide a new proof of the result on the colors in cyclically interval edge colorings of simple cycles which was first proved by Rafayel R. Kamalian in the paper “On a Number of Colors in Cyclically Interval Edge Colorings of Simple Cycles, Open Journal of Discrete Mathematics, 2013, 43-48”.
Graphs with k-Role Assignments  [PDF]
Yana Liu, Yongqiang Zhao
Open Journal of Discrete Mathematics (OJDM) , 2017, DOI: 10.4236/ojdm.2017.73016
Abstract: For a given graph G, a k-role assignment of G is a surjective function \"\"?such that \"\", where N(x) and N(y) are the neighborhoods of x and y, respectively. Furthermore, as we limit the number of different roles in the neighborhood of an individual, we call r a restricted size k-role assignment. When the hausdorff distance between the sets of roles assigned to their neighbors is at most 1, we call r a k-threshold close role assignment. In this paper we study the graphs that have k-role assignments, restricted size k-role assignments and k-threshold close role assignments, respectively. By the end we discuss the maximal and minimal graphs which have k-role assignments.
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