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Search Results: 1 - 10 of 120330 matches for " Yanyan Wang "
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Plurisubharmonicity of Bergman Kernels on generalized annuli
Yanyan Wang
Mathematics , 2013,
Abstract: Let $A_\zeta=\Omega-\overline{\rho(\zeta)\cdot\Omega}$ be a family of generalized annuli over a domain $U$. We show that the logarithm $\log K_{\zeta}(z)$ of the Bergman kernel $K_{\zeta}(z)$ of $A_\zeta$ is plurisubharmonic provided $\rho\in PSH(U)$. It is remarkable that $A_\zeta$ is non-pseudoconvex when the dimension of $A_\zeta$ is larger than one. For standard annuli in ${\mathbb C}$, we obtain an interesting formula for $\partial^2 \log K_{\zeta}/\partial \zeta\partial\bar{\zeta}$, as well as its boundary behavior.
Variations of Bergman Kernels for Some Explicitly Given Families of Planar Domains
Yanyan Wang
Mathematics , 2012,
Abstract: We study the parameter dependence of the Bergman kernels on some planar domains depending on complex parameter \zeta in nontrivial "pseudoconvex" ways. Smoothly bounded cases are studied at first: It turns out that, in an example where the domains are annuli, the Levi form for the logarithm of the Bergman kernels with respect to \zeta approaches to 0 as the point tends to the boundary of the domain, and in another example where the domains are discs, it approaches to 1 as the point tends to the complement of a point in the boundary. Further, in contrast to this, in the cases where the boundary of the domains are not smooth, such as discs with slits, rectangles and half strips, completely different phenomena are observed.
MtsR, an Iron-Dependent Regulator in Streptococcus iniae  [PDF]
Jun Wang, Peng Wang, Yanyan Qin, Lili Zou
Agricultural Sciences (AS) , 2018, DOI: 10.4236/as.2018.95042
Abstract: Streptococcus iniae (S. iniae) is a major pathogen that is capable of resulting severe economic loss to cultured fish. Steadily iron availability from micro-environment is an important virulence factor for pathogens, and S. iniae encodes the iron-transporter MtsABC to accomplish heme utilization, but very little was known about the mechanisms involved in regulating and maintaining iron balance in S. iniae. In this study, the role of a putative iron-dependent transcriptional regulator MtsR was investigated, and the results showed that MtsR regulated the expression of iron-transport mtsABC to control iron homeostasis in S. iniae.
Global Convergence for Cohen-Grossberg Neural Networks with Discontinuous Activation Functions
Yanyan Wang,Jianping Zhou
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/109319
Abstract: Cohen-Grossberg neural networks with discontinuous activation functions is considered. Using the property of -matrix and a generalized Lyapunov-like approach, the uniqueness is proved for state solutions and corresponding output solutions, and equilibrium point and corresponding output equilibrium point of considered neural networks. Meanwhile, global exponential stability of equilibrium point is obtained. Furthermore, by contraction mapping principle, the uniqueness and globally exponential stability of limit cycle are given. Finally, an example is given to illustrate the effectiveness of the obtained results.
A Positive and Comparative Research on Enterprise Competitiveness between Hubei Province and Coastal Provinces
Yonghua Zhu,Yanyan Wang
International Journal of Business and Management , 2009,
Abstract: According to the three index dimensions which include index value of enterprise scope competitiveness, enterprise management competitiveness and enterprise innovation competitiveness, this article proceeds the comparison and analysis the index mean-values of enterprise competitiveness between in Hubei Province and 31 provinces and cities of China and six coastal provinces in 2005. The result shows that in 2005, the index value of enterprise competitiveness in Hubei Province was ranked No.15 in the whole country, scale competitiveness was ranked No.12, management competitiveness was ranked No.20, innovation competitiveness was ranked No.13, comparing with coastal provinces, scale competitiveness and innovation competitiveness only were 26% of latter average values, management competitiveness was 95% of latter mean value. Enterprise competitiveness in Hubei had a wide gap comparing with coastal provinces, so it need promote such as management competitiveness in Hubei Province.
Study on the Function of XBRL and the Enhancement of the Accounting Information Quality under the Background of Informationization
Xin Yuan,Yanyan Wang
International Journal of Business and Management , 2009, DOI: 10.5539/ijbm.v4n11p137
Abstract: As a new information standard and technology supporting the accounting internationalization and the globalization of financial report, XBRL (eXtensible Business Reporting Language) has not been concerned by Chinese enterprises and accounting personnel in the time that the informationization develops so quickly. Under the background of informationization, the functions of XBRL are discussed in the article to enhance the accounting information quality, which indicates that China should well grasp the demands of the economic development and the promotion function of the accounting information processing technology to the accounting.
Investigation of Listed Companies Credit Risk Assessment Based on Different Learning Schemes of BP Neural Network
Yanyan Han,Bo Wang
International Journal of Business and Management , 2011, DOI: 10.5539/ijbm.v6n2p204
Abstract: Credit risk analysis of enterprise is an important topic in financial field, this paper employs BP neural network to solve this problem. Indexes system of company and three different BP neural networks have been built. The neural networks are trained using financial data from different industry. We use Matlab program and neural network to get the results in seven learning schemes with different training-to-validation data ratios. Experimental results will suggest which neural network model, and under which learning scheme can deliver optimum performance.
A Primary Study on Financing Obstacles to Enhance China’s SMEs Competition
Gang Wang,Yanyan Zang
International Journal of Business and Management , 2009,
Abstract: With the development of Chinese economy and market, more and more enterprises have been found in China. A large number of small and medium enterprises (SMEs) are booming during the transition process. However, how to manage, control and enhance their competitions to share the market becomes a very considerable problem. Especially, facing the critical financial problems, SMEs have to seek new path to solve them.
A Primary Study on the MNEs’ Entry Strategies in Emerging Market
Yanyan Zang,Gang Wang
International Journal of Business and Management , 2009,
Abstract: Over the last decade, emerging markets have become most attractive location of FDI; many multinational enterprises have expanded their global strategies to take advantage of business opportunities from it. However, emerging market also pose particular challenges to investors due to uncertain political, economic environment poorly developed legal and institutional framework, and social culture barriers. Those factors will lead high transaction cost and also the low efficiency. Therefore choosing the appropriate model by the MNE in accessing the emerging market is a vital decision.
Measures and Suggestions for Enterprises to Retain Job-hoppers
Gang Wang,Yanyan Zang
International Journal of Business and Management , 2009,
Abstract: With the increasing number of job-hoppers nowadays, how to retain them has become a ticklish issue for a lot of enterprises. Some surveys show that the lack of room for individual growth and dissatisfaction at their wages have resulted in the current situation. Based on some necessary analysis, this article puts forward with some relevant measures with emphasis on enterprises’ efforts on how to choose, employ, care for, develop their talents and their application of “man-oriented” values to their regulations and documents. Actually, only in this way will their employees set their minds to their work.
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