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Search Results: 1 - 10 of 3282 matches for " Wenwei Niu "
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Information Fusion-Based Storage and Retrieve Algorithms for WSNs in Disaster Scenarios
Zhe Xiao,Ming Huang,Jihong Shi,Wenwei Niu,Jingjing Yang
International Journal of Distributed Sensor Networks , 2012, DOI: 10.1155/2012/524543
Abstract: Sensor networks are especially useful in catastrophic or disaster scenarios such as abysmal sea, floods, fires, or earthquakes where human participation may be too dangerous. Storage technologies take a critical position for WSNs in such scenarios since the sensor nodes may themselves fail unpredictably, resulting in the loss of valuable data. This paper focuses on fountain code-based data storage and recovery solutions for WSNs in disaster scenarios. A review on current technologies is given on challenges posed by disaster environments. Two information fusion-based distributed storage (IFDS) algorithms are proposed in the “few global knowledge” and “zero-configuration” paradigm, respectively. Correspondingly, a high-efficient retrieve algorithm is designed for general storage algorithms using Robust Soliton distribution. We observe that the successful decoding probability can be provisioned by properly selecting parameters—the ratio of number of source node and total nodes, and the storage capacity M in each node.
Growth and Physiological Responses of Maize and Sorghum Genotypes to Salt Stress
Genhua Niu,Wenwei Xu,Denise Rodriguez,Youping Sun
ISRN Agronomy , 2012, DOI: 10.5402/2012/145072
Growth and Physiological Responses of Maize and Sorghum Genotypes to Salt Stress
Genhua Niu,Wenwei Xu,Denise Rodriguez,Youping Sun
ISRN Agronomy , 2012, DOI: 10.5402/2012/145072
Abstract: The growth and physiological responses of four maize inbred lines (CUBA1, B73, B5C2, and BR1) and four sorghum hybrids (SS304, NK7829, Sordan 79, and KS585) to salinity were determined. Fifteen days after sowing, seedlings were irrigated with nutrient solution (control) at electrical conductivity (EC) of 1.5?dS?m?1 or saline solution at EC of 8.0?dS?m?1 (salt treatment) for 40 days. Dry weight of shoots in maize was reduced by 58%, 65%, 62%, and 69% in CUBA1, B73, B5C2, and BR1, respectively, while that of sorghum was reduced by 51%, 56%, 56%, and 76% in SS304, NK7829, Sordan79, and KS585, respectively, in the salt treatment compared to their respective control. Salinity stress reduced all or some of the gas exchange parameters, leaf transpiration (E), stomatal conductance (gs), and net photosynthetic rate (Pn) in the late part of the experiment for both crops. Salinity treatment greatly increased Na+ uptake in all maize genotypes but did not affect the Na+ uptake in sorghum, regardless of genotype. In maize, CUBA1 was slightly more resistant to salt stress, while BR1 was more sensitive to salt stress. In sorghum, Sordan79 was the most tolerant genotype, and KS585 was the least tolerant genotype. 1. Introduction Soil salinity is one of the major environmental stresses that adversely affect plant growth and development. More than 800 million hectares of land throughout the world are salt affected, either by salinity (397 million ha) or the associated condition of sodicity (434 million ha) [1]. Effects of salinity on crop productivity are more severe in arid and semiarid regions where limited rainfall, high evapotranspiration, high temperature, poor water quality, and poor soil management practices exacerbate salinity effect [2]. As world population increases rapidly, the demand for maize and sorghum to meet the food and nonfood requirement necessitates crop production in marginal lands. Marginal land refers to land with low inherent productivity, that has been abandoned or degraded, or is of low quality for agricultural uses [3]. Most marginal lands are located in arid and semiarid regions where soil salinity is often too high for optimal production for most common economic crops and groundwater with high salinity is the primary water source. Therefore, identifying salt-tolerant crops and improving salt tolerance for salt-affected lands are critically important. Salinity affects plants through osmotic stress and ion imbalance and toxicity [4]. Osmotic effects are due to salt-induced decrease in the soil water potential. High salts inside the plant take
Overview of Research and Development for Anticancer Drugs  [PDF]
Junjie Xu, Wenwei Mao
Journal of Cancer Therapy (JCT) , 2016, DOI: 10.4236/jct.2016.710077
Abstract: Anticancer drugs research and development have been the largest market area in the pharmaceutical industry in terms of the number of project, clinical trials and spending. In the last 10 - 30 years, targeting therapy for cancers has been developed and achieved enormous clinical effectiveness by transforming some previously deadly malignancies into chronically manageable conditions, but cure problem still remains. This mini review outlined the current status of anticancer drugs development and hinted the opinions of how to further increase the accuracy and efficacy of discovery for cancer treatment.
Study on the Dynamic Characteristics of Light Steel Residential Structural System  [PDF]
Wenwei Yang, Qili Yang
Engineering (ENG) , 2017, DOI: 10.4236/eng.2017.96037
Abstract: The study on the dynamic characteristics of light steel residential structural system has both theoretical and practical significance for the application and promotion of light steel residential structural system. In this paper, we analyze several common types of light steel residential structural system, describe the dynamic characteristics of the light steel residential structural system for an overview on the basis of former related studies, and then summarize the advantages of light steel residential structure system.
Cyclically Interval Total Coloring of the One Point Union of Cycles  [PDF]
Shijun Su, Wenwei Zhao, Yongqiang Zhao
Open Journal of Discrete Mathematics (OJDM) , 2018, DOI: 10.4236/ojdm.2018.83006
Abstract: A total coloring of a graph G with colors 1, 2, ..., t is called a cyclically interval total t-coloring if all colors are used, and the edges incident to each vertex v∈V(G) together with v are colored by (dG(v)+1) consecutive colors modulo t, where dG(v) is the degree of the vertex v in G. The one point union \"\"of k-copies of cycle Cn is the graph obtained by taking v as a common vertex such that any two distinct cycles?\"\" and?\"\" are edge disjoint and do not have any vertex in common except v. In this paper, we study the cyclically interval total colorings of \"\", where n≥3 and k≥2.
Bifurcation of Arabidopsis NLR Immune Signaling via Ca2+-Dependent Protein Kinases
Xiquan Gao,Xin Chen,Wenwei Lin,Sixue Chen,Dongping Lu,Yajie Niu,Lei Li,Cheng Cheng,Matthew McCormack,Jen Sheen ,Libo Shan ,Ping He
PLOS Pathogens , 2013, DOI: 10.1371/journal.ppat.1003127
Abstract: Nucleotide-binding domain leucine-rich repeat (NLR) protein complexes sense infections and trigger robust immune responses in plants and humans. Activation of plant NLR resistance (R) proteins by pathogen effectors launches convergent immune responses, including programmed cell death (PCD), reactive oxygen species (ROS) production and transcriptional reprogramming with elusive mechanisms. Functional genomic and biochemical genetic screens identified six closely related Arabidopsis Ca2+-dependent protein kinases (CPKs) in mediating bifurcate immune responses activated by NLR proteins, RPS2 and RPM1. The dynamics of differential CPK1/2 activation by pathogen effectors controls the onset of cell death. Sustained CPK4/5/6/11 activation directly phosphorylates a specific subgroup of WRKY transcription factors, WRKY8/28/48, to synergistically regulate transcriptional reprogramming crucial for NLR-dependent restriction of pathogen growth, whereas CPK1/2/4/11 phosphorylate plasma membrane-resident NADPH oxidases for ROS production. Our studies delineate bifurcation of complex signaling mechanisms downstream of NLR immune sensors mediated by the myriad action of CPKs with distinct substrate specificity and subcellular dynamics.
Study on the Market Risk Measurement of the Style Portfolios in Stock Markets Based on EVT-t-Copula Model
Yuhong Zhou,Wenwei Guo
International Journal of Online Engineering (iJOE) , 2013, DOI: 10.3991/ijoe.v9is2.2595
Abstract: For the presence of non-normal distribution characteristics in the financial assets returns, the model of AR(1)-GJR(1,1) is used to characterize the marginal distribution of the style assets in China stock market. The Copula function is introduced to analyze the dependency structure between the six style assets, combined with the marginal distributed residual sequences. And the joint return distribution of the style portfolios is simulated, combined with extreme value theory and Monte Carlo simulation method. Then the market risks (VaR and CVaR) of the style portfolios in China stock markets are obtained. The results of the study show that the generalized Pareto distribution Model can well fit the non-normal distribution characteristics such as peak and fat tail in the style assets returns.
Salient Region Detection and Analysis Based on the Weighted Band-Pass Features  [PDF]
Nevrez ?mamo?lu, Jose Gomez-Tames, Wenwei Yu
Journal of Software Engineering and Applications (JSEA) , 2013, DOI: 10.4236/jsea.2013.65B009
Abstract: Researches on visual attention mechanism have revealed that the human visual system (HVS) is sensitive to the higher frequency components where they are distinctive from their surroundings by popping out. These attentive components of the scene can be in any form such as edge to texture differences based on the focus of attention of HVS. There are several visual attention computational models that can yield saliency values of attentive regions on the image. Some of these models take advantage of band-pass filter regions on spatial domain by computing center-surround differences with difference of low pass filters. They use either down-sampling that may cause loss of information or constant scale of the filters that may not contain all the necessary saliency information from the image. Therefore, we proposed an efficient and simple saliency detection model with full resolution and high perceptual quality, which outputs several band-pass regions by utilizing Fourier transform to obtain attentive regions edges to textures from the color image. All these detected important information with different bandwidth, then, were fused in a weighted manner by giving more priority to the texture compared to edge based salient regions. Experimental analysis was made for different color spaces and the model was compared with some relevant state of the art algorithms. As a result, the proposed saliency detection model has promising results based on the area under curve (AUC) performance evaluation metric.
Spatial-Temporal Features of Wuhan Urban Agglomeration Regional Development Pattern—Based on DMSP/OLS Night Light Data  [PDF]
Mengjie Zhang, Wenwei Miao, Yingpin Yang, Chong Peng, Yaping Huang
Journal of Building Construction and Planning Research (JBCPR) , 2017, DOI: 10.4236/jbcpr.2017.51002
Abstract: Based on the night light data, urban area data, and economic data of Wuhan Urban Agglomeration from 2009 to 2015, we use spatial correlation dimension, spatial self-correlation analysis and weighted standard deviation ellipse to identify the general characteristics and dynamic evolution characteristics of urban spatial pattern and economic disparity pattern. The research results prove that: between 2009 and 2013, Wuhan Urban Agglomeration expanded gradually from northwest to southeast and presented the dynamic evolution features of “along the river and the road”. The spatial structure is obvious, forming the pattern of “core-periphery”. The development of Wuhan Urban Agglomeration has obvious imbalance in economic geography space, presenting the development tendency of “One prominent, stronger in the west and weaker in the east”. The contract within Wuhan Urban Agglomeration is gradually decreased. Wuhan city and its surrounding areas have stronger economic growth strength as well as the cities along The Yangtze River. However, the relative development rate of Wuhan city area is still far higher than other cities and counties.
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