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Search Results: 1 - 10 of 138566 matches for " Wang Dong "
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Recognition of Greenhouse Cucumber Disease Based on Image Processing Technology  [PDF]
Dong Pixia, Wang Xiangdong
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.31B006
Abstract: This paper mainly studies the disease of cucumber downy mildew, powdery mildew and anthracnose leaf image processing and recognition technologies. Application of median filtering method of filtering noise, leaf spot disease of cucumber leaf color range segmentation part extract color feature parameters of the lesion site, characteristic parameters of the shape; extraction texture parameters by using gray level co-occurrence matrix. Based on the shortest distance methods to identify diseases of images. The experimental result showed that the current method on disease recognition accuracy rates more than 96%.
A Comparative Study of Customer Value Drivers between Traditional Channels and Network Channel  [PDF]
Sili Wang, Dahai Dong
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.33011
Abstract:

With the rapid development of information technology, more and more customers start shopping online, this phenomenon has caused the performance of physical stores reducing. This article uses Decision-Making Trial and Evaluation Laboratory (DEMATEL) approach to structure and evaluate the customer value drivers between traditional channels and network channels, finds out the different effect of the drivers in the two channels, then to guide practice.

Solitary Wave Solutions and Rational Solutions for Modified Zakharov-Kuznetsov Equation with Initial Value Problem  [PDF]
Zhongzhou Dong, Ling Wang
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.65081
Abstract: The modified Zakharov-Kuznetsov equation with the initial value problem is studied numerically by means of homotopy perturbation method. The analytical approximate solutions of the modified Zakharov-Kuznetsov equation are obtained. Choosing the form of the initial value, the single solitary wave, two solitary waves and rational solutions are presented, some of which are shown by the plots.
China’s Trade Relations with the United States in Perspective
Dong Wang
Journal of Current Chinese Affairs , 2010,
Abstract: China’s trade relations with the United States over the past four decades is a topic that has not been fully dealt with in scholarly works. This paper charts the course of US-China economic relations since 1971, explains the principal forces stimulating growth and encouraging change and, finally, discusses how these two economic giants fit into an interlocking Asian and world economy. In reaction to the post-2008 financial downturn, advocates for a new world economic order have suggested a rebalancing of global demand, which will arguably become a major, politically charged issue in the US and in China in the years to come. Growing economic interdependence has quickly presented new challenges and opportunities, with issues such as human rights, Most-Favoured-Nation status, the Taiwan and Tibet question, and the huge American trade deficit threatening to cloud the relationship at times. With China’s emergence as a major power and America’s hegemonic ambitions tested in successive wars, the contradiction between a booming commercial relationship and conflict associated with geopolitical and ideological differences will continue to constitute a serious challenge. The long-term goal for each side will be to forge economic ties strong enough to create a stable political relationship, rather than to be held hostage by geopolitical constraints.
A brief study on the application of common antimicrobial agents in neurology department
WANG Dong
Chinese Journal of Contemporary Neurology and Neurosurgery , 2013, DOI: 10.3969/j.issn.1672-6731.2013.02.002
Abstract:
A PDE for the multi-time joint probability of the Airy process
Dong Wang
Mathematics , 2007,
Abstract: This paper gives a PDE for multi-time joint probability of the Airy process, which generalizes Adler and van Moerbeke's result on the 2-time case. As an intermediate step, the PDE for the multi-time joint probability of the Dyson Brownian motion is also given.
The largest sample eigenvalue distribution in the rank 1 quaternionic spiked model of Wishart ensemble
Dong Wang
Mathematics , 2007, DOI: 10.1214/08-AOP432
Abstract: We solve the largest sample eigenvalue distribution problem in the rank 1 spiked model of the quaternionic Wishart ensemble, which is the first case of a statistical generalization of the Laguerre symplectic ensemble (LSE) on the soft edge. We observe a phase change phenomenon similar to that in the complex case, and prove that the new distribution at the phase change point is the GOE Tracy--Widom distribution.
Spiked Models in Wishart Ensemble
Dong Wang
Mathematics , 2008,
Abstract: The spiked model is an important special case of the Wishart ensemble, and a natural generalization of the white Wishart ensemble. Mathematically, it can be defined on three kinds of variables: the real, the complex and the quaternion. For practical application, we are interested in the limiting distribution of the largest sample eigenvalue. We first give a new proof of the result of Baik, Ben Arous and P\'{e}ch\'{e} for the complex spiked model, based on the method of multiple orthogonal polynomials by Bleher and Kuijlaars. Then in the same spirit we present a new result of the rank 1 quaternionic spiked model, proven by combinatorial identities involving quaternionic Zonal polynomials (\alpha = 1/2 Jack polynomials) and skew orthogonal polynomials. We find a phase transition phenomenon for the limiting distribution in the rank 1 quaternionic spiked model as the spiked population eigenvalue increases, and recognize the seemingly new limiting distribution on the critical point as the limiting distribution of the largest sample eigenvalue in the real white Wishart ensemble. Finally we give conjectures for higher rank quaternionic spiked model and the real spiked model.
The largest eigenvalue of real symmetric, Hermitian and Hermitian self-dual random matrix models with rank one external source, part I
Dong Wang
Mathematics , 2010, DOI: 10.1007/s10955-012-0417-x
Abstract: We consider the limiting location and limiting distribution of the largest eigenvalue in real symmetric ($\beta$ = 1), Hermitian ($\beta$ = 2), and Hermitian self-dual ($\beta$ = 4) random matrix models with rank 1 external source. They are analyzed in a uniform way by a contour integral representation of the joint probability density function of eigenvalues. Assuming the one-band condition and certain regularities of the potential function, we obtain the limiting location of the largest eigenvalue when the nonzero eigenvalue of the external source matrix is not the critical value, and further obtain the limiting distribution of the largest eigenvalue when the nonzero eigenvalue of the external source matrix is greater than the critical value. When the nonzero eigenvalue of the external source matrix is less than or equal to the critical value, the limiting distribution of the largest eigenvalue will be analyzed in a subsequent paper. In this paper we also give a definition of the external source model for all $\beta$ > 0.
Random matrices with external source and KP $τ$ functions
Dong Wang
Mathematics , 2008, DOI: 10.1063/1.3167802
Abstract: In this paper we prove that the partition function in the random matrix model with external source is a KP $\tau$ function.
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