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Search Results: 1 - 10 of 167801 matches for " WU Xue-li "
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A Class of Key Predistribution Schemes Based on Orthogonal Arrays
Jun-Wu Dong,Ding-Yi Pei,Xue-Li Wang,
Jun-Wu Dong
,Ding-Yi Pei,and Xue-Li Wang

计算机科学技术学报 , 2008,
Abstract: Pairwise key establishment is a fundamental security service in sensor networks; it enables sensor nodes to communicate securely with each other using cryptographic techniques. In order to ensure this security, many approaches have been proposed recently. One of them is to use key predistribution schemes (KPSs) by means of combinatorial designs. In this paper, we use the Bush’s construction of orthogonal arrays to present a class of key predistribution schemes for distributed sensor networks. The secure connectivity and resilience of the resulting sensor network are analyzed. This KPS constructed in our paper has some better properties than those of the existing schemes. Electronic supplementary material The online version of this article (doi: ) contains supplementary material, which is available to authorized users. This work was partially supported by the National Natural Science Foundation of China under Grant Nos. 60473017, 90604034 and 10771078.
Innate immune response to dengue virus
Xue-li ZHENG
Medical Journal of Chinese People's Liberation Army , 2012,
Abstract: Dengue fever/dengue hemorrhagic fever (DF/DHF) has emerged as the most important mosquito-borne viral diseases in tropical areas. DF/DHF is one of the problems which severely threaten public-health world-wide. To understand innate immune response of the body to pathogens is of significant significance in controlling dengue virus infection. The invasion of the virus to the host cell is the first and critical stage in the infectious process and the mechanism and identity of cellular proteins involved in this process remain largely unknown. Interstitial dendritic cells (DCs) are target cells for DF and also believed to constitute the first line of the innate host defense against invasion of dengue viruses. There are two innate immune pathways that activate the host innate immunity against viral infection. One of the pathways utilizes members of the Toll-like receptor (TLR) family to detect viruses that enter the endosome through endocytosis and induce production of interferon (IFN) by signal protein, and finally activates translation factors such as NF-κB, interferon regulatory factor (IRF) 7 and IRF5. The other antiviral pathway involves the RNA helicase RIG-I as the receptor for intracellular viral double-stranded RNA (dsRNA). The closely related microRNA (miRNA) and RNAi pathways have emerged as important regulators of virus–host cell interactions.
Fast Image Segmentation Based on NAMPD

WU Xue-li,CHEN Chuan-bo,XIA Hui,

计算机科学 , 2009,
Abstract: With the concept of packing problem,the Non-symmetry and Anti-packing pattern representation Model(NAM)uses a set of sub-patterns to represent an original pattern.In this paper,we developed a new method for grey scale image representation based on NAM,called NAM-structured plane decomposition(NAMPD).In NAMPD,each sub-pattern is associated with a rectangular region in the image.The luminance function of pixels in this region was approximated by an oblique plane model.Image segmentation was a key method in im...
The perturbation of the single valued extension property for bounded linear operators

吴学俪, 曹小红, 张敏
WU Xue-li
, CAO Xiao-hong, ZHANG Min

- , 2015, DOI: 10.6040/j.issn.1671-9352.0.2014.516
Abstract: 摘要: 设H是复可分无限维Hilbert空间,B(H)为H上的有界线性算子的全体。Hilbert空间H中一个算子T称作有单值扩张性质(简写为SVEP,记作T∈(SVEP)),若对任意一个开集U∈C,满足方程(T-λI)f(λ)=0(?λ∈U)的唯一的解析函数为零函数,其中C代表复数集。T∈B(H)称为满足单值扩张性质的紧摄动,若对任意的紧算子K∈K(H),T+K满足单值扩张性质。 讨论了有界线性算子满足单值扩张性质的紧摄动的判定条件,同时给出了2×2上三角算子矩阵满足单值扩张性质的紧摄动的充要条件。
Abstract: Let H be an infinite dimensional separable complex Hilbert space and B(H) the algebra of all bounded linear operators on H. An operator T∈B(H) is said to have the single-valued extension property(SVEP for brevity, write T∈ (SVEP)), if for every open set U∈C, the only analytic solution f:U→X of the equation (T-λI)f(λ)=0 for all λ∈U is zero function on U, where C denotes the complex number set. T∈B(H) is said to have the perturbations of the single valued extension property if T+K have the single-valued extension property for every compact operator K∈K(H). The perturbations of the single valued extension property for bounded linear operators are discussed, and the sufficient necessary condition for is given 2×2 upper triangular operator matrices for which the single valued extension property is stable under compact perturbations
Non-symmetry and overlapping anti-packing representation with square sub-patterns

WU Xue-li,CHEN Chuan-bo,SHANG Jun-ying,WU Rong-yu,

计算机应用 , 2008,
Abstract: With the concept of the Non-symmetry and Anti-packing pattern representation Model (NAM), a Non-symmetry and Overlapping Anti-packing pattern representation with Square sub-patterns(NOAS) was proposed. The NOAS divided the original pattern into square sub-patterns, which of overlapping were permitted. The encoding and decoding algorithms for binary images were presented. By comparing the proposed algorithm with the linear quadtree, the theoretical results show that the compression ratio of the former is muc...
Prevalence of PTSD and Depression among Junior Middle School Students in a Rural Town Far from the Epicenter of the Wenchuan Earthquake in China
Wei Wang, Wei Fu, Jin Wu, Xian-cang Ma, Xue-li Sun, Yi Huang, Kenji Hashimoto, Cheng-ge Gao
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0041665
Abstract: Context On May12th 2008, a devastating earthquake measuring 8.0 on the Richter scale, struck Wenchuan county and surrounding areas in China. The prevalence of mental illness among children and adolescents in a rural town far from the earthquake epicenter is unknown. Objective To assess the prevalence of posttraumatic stress disorder (PTSD) and depression among junior middle school students in a rural town Ningqiang county, 327 km from the earthquake epicenter. Design, Setting, and Participants A population-based mental health survey was conducted in March, 2009. Main Outcome Measure Survey Self-designed General Condition Survey Scale, Children's Revised Impact of Event Scale (CRIES-13), and the Depression Self-rating Scale for Children (DSRSC) were used to sample 1,841 junior middle school students in Ningqiang county, ten months after the Wenchuan earthquake. Results The prevalence rate of a high-risk for PTSD was 28.4%, with 32.7% among females, 23.8% among males (female vs. male, p<0.001), 38.6% in the severe exposure group and 24.3% in the mild exposure group (severe vs. mild exposure, p<0.001). For depressive symptoms, the overall prevalence was 19.5%, with 24.0% among females, 14.7% among males, 24.5% in the severe exposure group and 17.5% in the mild exposure group (female vs. male, p<0.001; severe vs. mild exposure, p<0.001, respectively). In multivariate analysis, factors such as “having felt despair”, or “danger” and “having own house destroyed or damaged” were significantly associated with PTSD symptoms. Female gender and delayed evacuation in females, and earthquake related experiences in males were significantly associated with depression. Conclusion Traumatic events experienced during the earthquake were significantly associated with symptoms of PTSD and depression in children and adolescents, ten months after the Wenchuan earthquake. These data highlight a need for mental health services for children and adolescents in rural areas, far from earthquake epicenters.
Interactive Shape Modification of the G2 Cubic Hermite Spline Curves

LAI Shun-nan,WU Xue-li,WANG Guo-ping,

计算机应用研究 , 2004,
Abstract: In the paper,we propose one approach of G2 cubic Hermite spline curve construction and its shape modification.By modifying the point position in the curve,the geometric shape which user required can be obtained conveniently.Finally,many examples have verified its convenience and intuition and numerical stability in practice.
Trapezium-based Non-symmetry Anti-packing Representation Method for Binary Images

HUANG Wei,CHEN Chuan-bo,ZHENG Yun-ping,WU Xue-li,

计算机科学 , 2008,
Abstract: Although the hierarchical structures have many merits in image representation and processing,their compactness is impaired because of excessive emphases upon the symmetry of divisions and the symmetry of nodes.Inspirited by the concept of the famous Packing Problem,based on non-symmetry anti-packing pattern representation model,a trapezium-based non-symmetry anti-packing representation method for binary images is presented.After giving encoding and decoding algorithms,this paper analyses the time-and space-...
Overlapping Rectangle Multi-valued Image Representation and its Application in Geometric Moments Generation

HUANG Wei,CHEN Chuan-bo,ZHENG Yun-ping,WU Xue-li,

计算机科学 , 2008,
Abstract: A lossless multi-valued image representation,referred as to Overlapping Rectangle Multi-valued Image Representation(ORMIR)was presented in this paper for the fast generation of geometric moments of multi-valued images.ORMIR divides a multi-valued image into some overlapping rectangles with some basic colors and settles these rectangles in a child-sibling tree.By impairing the constraint in Image Block Representation where all the pixels covered with a distinct rectangle must have the same color,ORMIR has re...
Effects of long-term fertilization on r-K strategy microbial populations in farmland mollisol

ZHANG Ming,BAI Zhen,ZHANG Wei,FENG Hui-min,WU Ye-ye,DING Xue-li,ZHANG Xu-dong,

生态学杂志 , 2007,
Abstract: The microbial communities in agricultural soils are responsible for nutrient cycling,and thus,are the important indicators of soil fertility.In this paper,the effects of long-term fertilization on the r-K strategy populations and eco-physiological functional groups of bacteria and fungi in farmland Mollisol were investigated,and the results showed that fertilization decreased the evenness and richness of the fungal and bacterial populations,and the decrements of the bacterial and fungal eco-physiological(EP)indices were 0.019-0.106 and 0.023-0.185,respectively.The amounts of K strategy microbial populations in all treatments were higher than those of r strategy ones.Fertilization caused the increase of r strategy bacteria but the decrease of r strategy fungi.Compared with the control,applying medium amount of manure had the greatest increase of r-K strategy bacteria and K strategy fungi.The amounts of r-K strategy bacteria and K strategy fungi were higher under the combined application of chemical fertilizers and manure than under the application of chemical fertilizers.Under the conditions of K-strategists being predominant,the application of chemical fertilizers enhanced the r-strategy microbial proportion,while the combined application of chemical fertilizer and manure enhanced the ratio of K-strategists.Correlation analysis showed that K-strategy microbial populations had a significant positive correlation(P<0.01)with soil nitrogen content,suggesting that K-strategists might be the key microbial populations in soil nitrogen cycling.
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