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Search Results: 1 - 10 of 127199 matches for " Kexin Li "
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The Influence Factors of Collective Intelligence Emergence in Knowledge Communities Based on Social Network Analysis  [PDF]
Zhihong Li, Ya’nan Xu, Kexin Li
International Journal of Intelligence Science (IJIS) , 2019, DOI: 10.4236/ijis.2019.91002
Abstract: The advent of the age of Information shifts the environment we live in from off-line to on-line. The prospect of Collective Intelligence (CI) is promising. Based on this background, the aim of this paper is to discover the emergence mechanism and influence factors of CI in knowledge communities using the method of quantitative and qualitative analysis. On the basis of the previous research work, our model theorizes that the two dimensions of social network (i.e., interactive network structure and participant’s characteristics) affect two references of effectiveness (i.e. group knowledge production and participation of group decision). And this hypothetical model is validated with simulation data from “Zhihu” community. Our model has been useful since it offers some inspirations and directions to promote the level of CI in knowledge communities.
Digital Assets Price Forecast Based on POW Mining Mechanism  [PDF]
Zhihong Li, Jie Wang, Kexin Li
Open Journal of Social Sciences (JSS) , 2019, DOI: 10.4236/jss.2019.72016
Abstract: With the birth of blockchain technology, digital assets such as Bitcoin have also rapidly developed. In recent years, although the development of digital assets has been blocked by national policies, it is still favored by many investors in the capital market. Today, the price of Bitcoin has reached as high as 4000 $, and some early investors in Bitcoin have received rich returns. But the fluctuations in bitcoin prices are also difficult for investors to ponder, and even let some people lose their money. By analyzing the factors affecting the price of bitcoin, this paper predicts the trend of bitcoin price through linear regression model through the difficulty of mining based on POW mechanism and people’s attention to digital assets (Google Trend Index), thus providing investors with some reference comments.
New development of courtyard economic theory and practice in China

Li Kexin,

中国生态农业学报 , 2000,
Researches on the Inter-Provincial R&D Innovation Efficiency for Chinese High-Tech Industry  [PDF]
Kexin Liu
Modern Economy (ME) , 2016, DOI: 10.4236/me.2016.79095
Abstract: The characteristics of Chinese economic area are distinct, and the development status of the inter-provincial high-tech industry is significantly different. As Chinese high-tech industry is acting an increasingly important role in pushing the economic development, it is necessary to evaluate the inter-provincial R&D innovation efficiency for high-tech industry. This text, using the DEA Approach with Double Frontiers, made comparison for the evaluation unit with the “optimized” and “worst” decision-making unit respectively. Therefore it carried out measurement for the inter-provincial optimistic efficiency and pessimistic efficiency for Chinese high-tech industry, and suggested the comprehensive results with the geometric average efficiency. The research results showed that there were great differences among the R&D innovation efficiencies for Chinese high-tech industry among 26 provinces and municipalities. There is no need for the high-tech industry to blossom everywhere. It, based on the economic development and efficiency status, should be strengthened in Beijing, Tianjin, Guangdong, Chongqing and Jiangsu, etc.

YE Hengqiang,LI Douxing,GUO Kexin,

金属学报 , 1986,
Analysis on the International Competitiveness of Beijing’s Cultural Creative Industries  [PDF]
Kexin Cao, Jishun Niu
American Journal of Industrial and Business Management (AJIBM) , 2017, DOI: 10.4236/ajibm.2017.73011
Abstract: This paper analyzes the competitiveness of Beijing’s cultural creative industries, investigates the overall competitiveness of Beijing’s cultural creative industries in the international market share, and reveals the comparative advantage and industrial competitiveness of Beijing’s cultural creative industries in cultural creative products and cultural creative services. This study comprehensively evaluates the competitiveness of Beijing’s cultural creative industries.
Effectiveness of 10 polymorphic microsatellite markers for parentage and pedigree analysis in plateau pika (Ochotona curzoniae)
Kexin Li, Jianing Geng, Jiapeng Qu, Yanming Zhang, Songnian Hu
BMC Genetics , 2010, DOI: 10.1186/1471-2156-11-101
Abstract: The error in parentage assignment using a combination of these 10 loci was very low as indicated by their power of discrimination (0.803 - 0.932), power of exclusion (0.351 - 0.887), and an effectiveness of the combined probability of exclusion in parentage assignment of 99.999%.All the offspring of a family could be assigned to their biological mother; and their father or relatives could also be identified. This set of markers therefore provides a powerful and efficient tool for parentage assignment and other population analyses in the plateau pika.Plateau pikas (Ochotona curzoniae) are small lagomorphs that inhabit the high alpine grasslands of the Tibetan plateau of China. They live in cohesive families and occupy burrow systems. Plateau pikas exhibit monogamy, polygyny, polyandry and promiscuous mating systems [1]. Approximately 57.8% of pikas exhibit philopatry, and dispersal movements are extremely restricted, although some dispersal may occur to ensure spatial separation of kin that may otherwise mate [2]. Inbreeding would be expected to occur under these circumstances. Dominant males monopolize mating in order to maximise reproductive fitness and minimise inbreeding depression. Previous methods to determine the level of inbreeding and how it affects the population depended mainly on direct observation due to the lack of molecular tools. Although family group behaviors have been described through observation in the plateau pika [2-5], details of family structures lack corroborative molecular evidence. In some breeding systems such as lekking, polygyny, polyandry and cooperative breeding, it may be impossible to determine parentage from direct observations [6]. Therefore, molecular tools such as microsatellites markers are necessary to obtain genetic information about family structure, social behavior and dispersal. Microsatellite markers, also called short tandem repeats (STRs), are ideal molecular markers for various genetic studies because they are highly p
Spatial interpolation method based on integrated RBF neuralnetworks for estimating heavy metals in soil of a mountain region
Li Baolei, Zhang Yufeng, Shi Xinling, Zhang Kexin, Zhang Junhua
- , 2015, DOI: 10.3969/j.issn.1003-7985.2015.01.007
Abstract: A novel spatial interpolation method based on integrated radial basis function artificial neural networks(IRBFANNs)is proposed to provide accurate and stable predictions of heavy metals concentrations in soil at un-sampled sites in a mountain region. The IRBFANNs hybridize the advantages of the artificial neural networks and the neural networks integration approach. Three experimental projects under different sampling densities are carried out to study the performance of the proposed IRBFANNs-based interpolation method. This novel method is compared with six peer spatial interpolation methods based on the root mean square error and visual evaluation of the distribution maps of Mn elements. The experimental results show that the proposed method performs better in accuracy and stability. Moreover, the proposed method can provide more details in the spatial distribution maps than the compared interpolation methods in the cases of sparse sampling density.
Recent Progress of Counter Electrodes in Nanocrystalline Dye-sensitized Solar Cells
Kexin LI,Zhexun YU,Yanhong LUO,Dongmei LI,Qingbo MENG,

材料科学技术学报 , 2007,
Abstract: Dye-sensitized solar cell (DSC) consists a combination of several different materials: photoanodes with nanoparticulated semiconductors, sensitizers, electrolytes and counter electrodes (CEs). Each materials performs specific task for the conversion of solar energy into electricity. The main function of CE is to transfer electrons to the redox electrolyte and regenerate iodide ion. The work of CE is mainly focused on the studies of the kinetic performance and stability of the traditional CEs to improve the overall efficiency of DSC, seeking novel design concepts or new materials. In this review, the development and research progress of different CEmaterials and their electrochemical performance, and the problems are discussed.
Question on Some Principles of Electromagnetism
Kexin Yao
Applied Physics Research , 2012, DOI: 10.5539/apr.v4n3p115
Abstract: In theory of electromagnetism, there are principles indicated as below: motional magnetic field shall not exist; action and reaction can be in the same direction, but differ in value; magnetic field can have an infinitely great motional speed; the same physical phenomenon can be explained conversely in different inertia systems; there is no uniform scientific explanation for deflection of high-speed charged particle in magnetic field; coexistence of static magnetic field with static electric field cannot be explained. Hence, truth of the above principles of electromagnetism is questioned here.
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