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Search Results: 1 - 10 of 23435 matches for " Yuqiang Shi "
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Building Sequence Span Attribute Model and Example Analysis
Yuqiang Sun,Yuwan Gu,Guodong Shi
International Journal of Intelligent Systems and Applications , 2011,
Abstract: Parallel parsing is one of the key technologies of parallel system. Grammatical character affects the efficiency of parallel parsing and degree of difficulty of implement. Existing methods have problems as follows: Parallelism of grammar that adapt different data object is difference, if there is a large difference between considering attribute and analysis object structure, then affect efficiency. Specific grammar parallel parsing is systematically studied. Scanning parallel parsing methods from the new angle of sequence span after word lattice distortion. Considering sequence span attribute between some specific grammars makes parsing without changing structure and data of CYK table based on the structure of word lattice CYK initialization table; In passing item of the form [i , j , B η ] in parallel parsing item table memory structure in circle structure is adopted chain breaking technology; When indexed optimize analysis, the key algorithms of increasing the feasibility and validity of sequence span attribute、reusing parsing tree、calculating of d space function and node separating are further studied, then unification and optimize effect between analysis table middle structure and data object structure is reached. New algorithm and implement strategy of parallel parsing of specific grammar is proposed.
Domain-based Software Concurrent Engineering
Yuwan Gu,Guodong Shi,Dean Zhao,Yuqiang Sun
Information Technology Journal , 2013,
Abstract: The design idea of domain-based software concurrent engineering is proposed based on component-based software development. Its specific activities and the parallelism of events are dug and the parallel process model is established. The stress was reusable and parallel in the model. The parallel process model is described by Petri net, the reachable marking graph is established, the activity and safety of the process model is analyzed, it ensures reasonability of the model.
A Population Genetic Analysis of Continuously Selected Chlamys farreri Populations A Population Genetic Analysis of Continuously Selected Chlamys farreri Populations
ZHANG Lu,LI Yuli,LI Yangping,YANG Zhihui,LI Yuqiang,WANG Yangfan,WANG Shi,BAO Zhenmin
- , 2018,
Abstract: This study applied an optimized one-step 2b-RAD library construction strategy and performed simplified genome sequencing of 539 individuals from three continuously selected Chlamys farreri populations. SNP screening was performed using RAD typing software and population genetic parameters for the continuously selected populations from three generations(G1, G2, G3) were determined. The results showed that the optimized one-step 2b-RAD library construction strategy greatly simplified the experimental process, making it suitable for efficiently constructing a large number of libraries. A total of 18450 SNP markers were identified, which evenly distributed throughout the genome. Population genetic analysis of these three generations showed that the mean value of observed heterozygosity was 0.275 ± 0.177, 0.272 ± 0.181 and 0.275 ± 0.166, respectively. Meanwhile, the mean value of expected heterozygosity was 0.275 ± 0.141, 0.274 ± 0.145 and 0.280 ± 0.133, respectively. The Wright's fixation index(F) was 0.04291, 0.04976 and 0.06685, respectively. Markers deviated from Hardy–Weinberg equilibrium accounted for 10.34%, 12.64%, and 23.11%, and the Shannon diversity index was 0.0999 ± 0.0404, 0.0921 ± 0.0388 and 0.0733 ± 0.0308. FIS(also known as the inbreeding coefficient) of the three populations was 0.0256, 0.0323 and 0.0468, respectively. We suggested that the 2b-RAD method is well suited to population genetic studies of aquacultured organisms. Moreover, our results indicated that the continuous selection affected the population genetic structure of the cultured Penglai-Red scallop, but the change was not significant; therefore, population selection should continue
Fluctuation limits of strongly degenerate branching systems
Yuqiang LI
Mathematics , 2011, DOI: 10.1007/s11425-011-4279-5
Abstract: Functional limit theorems for scaled fluctuations of occupation time processes of a sequence of critical branching particle systems in $\R^d$ with anisotropic space motions and strongly degenerated splitting abilities are proved in the cases of critical and intermediate dimensions. The results show that the limit processes are constant measure-valued Wienner processes with degenerated temporal and simple spatial structures.
Functional ergodic theorems of site-dependent branching Brownian motions in R
Yuqiang LI
Mathematics , 2011,
Abstract: In this paper, we studied the functional ergodic limits of the site-dependent branching Brownian motions in R. The results show that the limiting processes are non-degenerate if and only if the variance functions of branching laws are integrable. When the functions are integrable, although the limiting processes will vary according to the integrals, they are always positive, infinitely divisible and self-similar, and their marginal distributions are determined by a kind of 1/2-fractional integral equations. As a byproduct, the unique non-negative solutions of the integral equations are explicitly presented by the Levy-measure of the corresponding limiting processes.
Riemann-Liouville processes arising from Branching particle systems
Yuqiang Li
Mathematics , 2012, DOI: 10.1142/S0219493712500220
Abstract: It is proved in this paper that Riemann-Liouville processes can arise from the temporal structures of the scaled occupation time fluctuation limits of the site-dependent (d,\alpha,\sigma(x))branching particle systems in the case of 1=d<\alpha<2 and \int_{\R}\sigma(x)\d x<\infty.
Robust Optimization of Performance Scheduling Problem under Accepting Strategy  [PDF]
Hui Ding, Yuqiang Fan, Weiya Zhong
Open Journal of Optimization (OJOp) , 2018, DOI: 10.4236/ojop.2018.74004
Abstract: In this paper, the problem of program performance scheduling with accepting strategy is studied. Considering the uncertainty of actual situation, the duration of a program is expressed as a bounded interval. Firstly, we decide which programs are accepted. Secondly, the risk preference coefficient of the decision maker is introduced. Thirdly, the min-max robust optimization model of the uncertain program show scheduling is built to minimize the performance cost and determine the sequence of these programs. Based on the above model, an effective algorithm for the original problem is proposed. The computational experiment shows that the performance’s cost (revenue) will increase (decrease) with decision maker’s risk aversion.
Forced Notch Signaling Inhibits Commissural Axon Outgrowth in the Developing Chick Central Nerve System
Ming Shi,Zhirong Liu,Yonggang Lv,Minhua Zheng,Fang Du,Gang Zhao,Ying Huang,Jiayin Chen,Hua Han,Yuqiang Ding
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0014570
Abstract: A collection of in vitro evidence has demonstrated that Notch signaling plays a key role in the growth of neurites in differentiated neurons. However, the effects of Notch signaling on axon outgrowth in an in vivo condition remain largely unknown.
应用非负矩阵分解的社交网络好友推荐
Friend Recommendation in Social Network Using Nonnegative Matrix Factorization

贺超波,付志文,石玉强, 钟松林
HE Chaobo
,FU Zhiwen,SHI Yuqiang,ZHONG Songlin

- , 2016, DOI: 10.6054/j.jscnun.2015.12.016
Abstract: 现有好友推荐方法只利用用户关系或内容信息进行推荐,难以获得较好的推荐质量. 针对该问题,在利用非负矩阵分解模型适合数据聚类以及数据约简的基础上,提出一种基于非负矩阵分解的好友推荐方法:FRNMF. 该方法采用基于非负矩阵分解的用户聚类为核心的好友推荐框架,利用用户好友关系网络信息和内容信息分别进行用户聚类,然后基于聚类结果计算用户间的综合相似度并进行好友推荐;不仅可以综合集成利用用户关系和内容两类信息,而且具有线性时间复杂度,还可以解决数据稀疏引起的推荐质量下降问题. 实验开发了FRNMF的原型系统,并在真实的新浪微博和学者网社交网络数据集进行对比实验,结果表明FRNMF比传统的好友推荐方法具有更好的推荐质量. 此外,对用户关系和内容两类信息的权重参数设置进行实验分析,分析表明适当提高用户关系信息的权重对于提高好友推荐质量具有促进作用.
: Most of existing friend recommendation methods only utilize user friendship or content information, and hence they are hard to obtain better recommendation quality. Aiming at this problem, Friend Recommendation using Nonnegative Matrix Factorization (FRNMF) for friend recommendation based on Nonnegative Matrix Factorization (NMF) is proposed, which is fit for data clustering and data reduction. FRNMF adopts user clusters as the core component of its framework. It firstly clusters users by utilizing user friendship network and user-generated content information respectively, and then calculates user pairwise similarities for recommendation based on the cluster results. It can use both user friendship and content information, and it has linear time complexity. FRNMF can alleviate the problem of data sparsity, which can result in the low recommendation quality. By developing protosystem of FRNMF and conducting comparative experiments on Weibo and Scholat social networks, the results show that our method performs better than traditional friend recommendation methods. Moreover, by experimental analysis, moderate increase of the weight of user friendship information can further improve the recommendation quality
A combined field and modeling study of groundwater flow in a tidal marsh
Yuqiang Xia,Hailong Li
Hydrology and Earth System Sciences Discussions , 2011, DOI: 10.5194/hessd-8-5123-2011
Abstract: Bald mud beaches were found among the mangrove marshes in Dongzhaigang National Nature Reserve, Hainan, China. To investigate the possible reasons for this phenomenon, the intertidal zones of a mangrove transect and a bald beach transect with similar topography and same tidal actions were selected for comparison study. Along both transects, observed water table variations were significant in the high and low intertidal zones and negligible in the middle intertidal zones. Field investigations and observations invite two speculations: (1) existence of a high-permeability zone on each transect which underlies the low-permeability surface mud sediments and outcrops in the high intertidal zone, and (2) considerable inland freshwater recharge along the mangrove transect but negligible freshwater recharge along the bald beach transect. Two-dimensional numerical simulations based on these speculations gave results in line with the observed water table. The bald beach is most probably due to the lack of enough freshwater for generating a brackish beach soil condition essential to mangrove growth. It is also indicated that seawater infiltrated the high-permeability zone through its outcrop near the high intertidal zone, and discharged from the tidal river bank in the vicinity of the low tide line, thereby forming a tide-induced seawater-groundwater circulation which may provide considerable contribution to the total submarine groundwater discharge.
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