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- 검색키워드
- 저자 : Chunqing Li (검색결과 5 건)
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Coverage Area Optimization Algorithm for Directed Sensing Network Based on Energy Aware
Li HaiSheng,Yang XiuZeng,Li ChunQing 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.7
Target area coverage is the most fundamental goal of WSN (Wireless Sensor Network) application, so the design of energy aware based algorithm for coverage time maximization becomes a core problem of a large network. For this reason, a DECAR (Distributed-energy and Coverage Aware Routing) protocol is proposed in this paper to realize the goal of network coverage maximization. Specifically, the rest energy and the coverage overlapping degree of the nodes are considered during CH (cluster head) selection process so as to provide more opportunities for the nodes with more rest energy or higher coverage overlapping degree to become CH; like this, the nodes with less rest energy will not be selected as CH, thus to avoid shortening the network lifetime due to early failure of these nodes and balance the network energy consumption. Meanwhile, the main data transmission line composed of CHs is constructed in the data transmission stage in order to improve data transmission efficiency. The simulation result shows: compared with CPCP-ea and EEUC protocols, the proposed DECAR protocol can obtain longer network lifetime and better data coverage ratio.
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Genomic diversity and admixture patterns among six Chinese indigenous cattle breeds in Yunnan
Rong Li,Chunqing Li,Hongyu Chen,Xuehong Liu,Heng Xiao,Shanyuan Chen 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.8
Objective: Yunnan is not only a frontier zone that connects China with South and Southeast Asia, but also represents an admixture zone between taurine (Bos taurus) and zebu (Bos indicus) cattle. The purpose of this study is to understand the level of genomic diversity and the extent of admixture in each Yunnan native cattle breed. Methods: All 120 individuals were genotyped using Illumina BovineHD BeadChip (777,962 single nucleotide polymorphisms [SNPs]). Quality control and genomic diversity indexes were calculated using PLINK software. The principal component analysis (PCA) was assessed using SMARTPCA program implemented in EIGENSOFT software. The ADMIXTURE software was used to reveal admixture patterns among breeds. Results: A total of 604,630 SNPs was obtained after quality control procedures. Among six breeds, the highest level of mean heterozygosity was found in Zhaotong cattle from Northeastern Yunnan, whereas the lowest level of heterozygosity was detected in Dehong humped cattle from Western Yunnan. The PCA based on a pruned dataset of 233,788 SNPs clearly separated Dehong humped cattle (supposed to be a pure zebu breed) from other five breeds. The admixture analysis further revealed two clusters (K = 2 with the lowest cross validation error), corresponding to taurine and zebu cattle lineages. All six breeds except for Dehong humped cattle showed different degrees of admixture between taurine and zebu cattle. As expected, Dehong humped cattle showed no signature of taurine cattle influence. Conclusion: Overall, considerable genomic diversity was found in six Yunnan native cattle breeds except for Dehong humped cattle from Western Yunnan. Dehong humped cattle is a pure zebu breed, while other five breeds had admixed origins with different extents of admixture between taurine and zebu cattle. Such admixture by crossbreeding between zebu and taurine cattle facilitated the spread of zebu cattle from tropical and subtropical regions to other highland regions in Yunnan.
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Cun Hui,Ke Li,Yonggang Li,Yadong Bian,Ran Hai,Chunqing Li 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.2
To explore the axial compression performance of high-strength recycled concrete-fi lled steel tube (RCFST) column in corrosive environments, ten high-strength RCFST columns with diff erent wall thicknesses of steel tube and corrosion degrees and two ordinary concrete-fi lled steel tube (CFST) columns were designed. Subsequently, an axial compression test was carried out on these specimens to obtain the load–displacement curve, skeleton curve, and rigidity degeneration curve. The stress process, failure morphology, characteristic load, and characteristic displacement were analyzed. According to the research fi ndings, the steel tube at the end of each specimen bulges. With increasing load, buckling occurs in the middle region, and the core concrete is crushed. The higher the corrosion degree of a specimen, the more obvious the buckling on its surface. The corrosion of a steel tube signifi cantly aff ects the initial stiff ness of high-strength RCFST column, which results in a signifi cant decline in its bearing capacity and stiff ness. An increase in the wall thickness of steel tubes can enhance the bearing capacity of a specimen. The ultimate balance theory was used to derive the calculation formula for the bearing capacity of each specimen, and the eff ects of diff erent lateral pressure coeffi cients on the results were compared and analyzed. Reasonable values were obtained by comparing with the experimental results. The software ABAQUS was used to establish a fi nite element numerical analysis model, and the damage deformation and load–displacement curves of each specimen were obtained. The analysis and comparison of the results obtained by the model and the obtained results verify the accuracy of the fi nite element analysis model.
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Guanghui Tian,Yadong Bian,Qingzhao Zhang,Chunqing Li,Yuxi Hao 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.4
In engineering applications, rocks rarely exist in their monolithic form and discontinuities always occur in the rocks. Intuitively there is a considerable difference in rheological properties between monolithic rocks and rocks with discontinuities. The present paper aims to characterise the shear creep and stress relaxation of serrate discontinuity in rock mass under different loading paths. A comprehensive experimental program, including creep tests, stress relaxation tests and unloading tests, on serrate discontinuities, is developed with focus on the effect of the slope angle of the serrated surface of the discontinuity on its creep and stress relaxation. Empirical models for shear creep and stress relaxation are also developed. We found in the paper that the larger the slope angle of a discontinuity is the larger both the creep and stress relaxation are, and the stress-strain relation of discontinuities in rock masses can be different under different loading paths. The significance of the research is that it investigates the simultaneous shear creep and stress relaxation of a serrate discontinuity under various loading paths. The paper concludes that the empirical models for creep and stress relaxation developed in the paper can help geotechnical engineers to analyse and assess the behaviour of rock masses with discontinuities.
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