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Search Results: 1 - 10 of 34537 matches for " Zhiwu Zhou "
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The Theory and Practice of Dialogue Teaching in University Political Course  [PDF]
Zhiwu Zhou
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.54017
Abstract: University political course is the main position to systemically educate undergraduates on Marxist theory. It has very important practical significance. Whereas, concerning the current situation of university political course, the teaching effectiveness has a considerable gap with its duty, which needs our introspection. From the perspective of dialogue teaching, this article discusses the theory and practice of political teaching in university.
The Influence of Nationalists to the Early Phase of Sinicization of Marxism  [PDF]
Zhiwu Zhou
Chinese Studies (ChnStd) , 2017, DOI: 10.4236/chnstd.2017.63016
Abstract: The process of spreading, developing and realizing Marxism in China is the process of combing the basic principles of Marxism with China’s actual conditions. During the early phase of localizing Marxism in China, nationalists translated and explained Marxist classic works, and then spread, analyzed and applied Marxism, making great contribution to the communication of it. Their researches and promotion of Marxism, along with the influence to intelligentsia of the time, had an impact on the sinicization of Marxism objectively.
The Current Situation of Whampoa Military Academy Site in the Patriotic Education of Contemporary College Students  [PDF]
Zhiwu Zhou
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.66018
Abstract: Whampoa Military Academy is a new type of military school founded in 1924 by Sun Yat-sen with the help of the Communist Party of China (CPC) and the Soviet Union. It is the result of the first cooperation between the Kuomintang (KMT) and the Communist Party and has a far-reaching impact on the history of Chinese revolution and military. As an important patriotism education base, the Whampoa Military Academy Site plays a crucial role for Chinese people, especially college students. The base is divided into two parts in the patriotic education for college students: one is tourism education, the other is the cooperation with universities to carry out political education. This paper mainly conducts a research, then analyzes the current situation of the Whampoa Military Academy Site in contemporary student political education, finds out the existing problems and gives some advice.
Low-Dosed X-Ray Computed Tomography Imaging by Regularized Fully Spatial Fractional-Order Perona-Malik Diffusion
Zhiwu Liao
Advances in Mathematical Physics , 2013, DOI: 10.1155/2013/371868
Abstract: Existing fractional-order Perona-Malik Diffusion (FOPMD) algorithms used in noise suppressing suffer from undesired artifacts and speckle effect, which hamper FOPMD used in low-dosed X-ray computed tomography (LDCT) imaging. In this paper, we propose a new FOPMD method for low-dose computed tomography (LDCT) imaging, which is called regularized fully spatial FOPMD (RFS-FOPMD), whose numerical scheme is also given based on Grünwald-Letnikov derivative (G-L derivative). Here, fully spatial FOPMD represents all the integer-order derivatives (IODs) in the right hand of Perona-Malik Diffusion (PMD) which are replaced by fractional-order derivatives (FODs). Since the new scheme has advantages of both regularization and FOPMD, it has good abilities in singularities preserving while suppressing noise. Some real sinogram of LDCT are used to compare the different performances not only for some classical but also for some state-of-art diffusion schemes. These schemes include PMD, regularized PMD (RPMD), and FOPMD in (Hu et al. 2012). Experimental results show that besides good ability in edge preserving, the new scheme also has good stability for iteration number and can avoid artifacts and speckle effect with suitable parameters. 1. Introduction Perona-Malik diffusion (PMD) proposed in 1990 is a popular technique in image denoising and it is defined as [1] where is the initial gray scale image, is the smoothed gray scale image at time , denotes the gradient, is the divergence operator, and is the diffusion coefficient. In 1992, Catté et al. indicated that PMD is ill-posed and they propose a new well-posed method named regularized Perona-Malik diffusion (RPMD), by replacing the gradient in diffusion coefficients by the smoothed version [2]. Thus, the RPMD can be represented as Here is defined as: which is a Gaussian function and is a constant. In order to eliminate undesired “staircase” of PMD and RPMD, high-order PDEs (typically fourth-order PDEs) for image restoration have been introduced in [3, 4]. Though these methods can eliminate the staircase effect efficiently, they often leave the image with isolated black and white speckles (so-called speckle effect) [5]. Recently, fractional-order PMD (FOPMD) has been studied in image denoising [5–14], whose fractional order is , , which is a “natural interpolation” between PMD and fourth-order PDEs. Therefore, it has the benefits of both of PMD and high order PDEs. Bai and Feng proposed a FSFOD method for image denoising with Euler-Lagrange equations of a cost functional and using Fourier-domain to compute the
Regularized Multidirections and Multiscales Anisotropic Diffusion for Sinogram Restoration of Low-Dosed Computed Tomography
Zhiwu Liao
Computational and Mathematical Methods in Medicine , 2013, DOI: 10.1155/2013/190571
Abstract: Although most of existing anisotropic diffusion (AD) methods are supported by prefect mathematical theories, they still lead to smoothed edges and anatomy details (EADs). They are caused by not considering the discrete nature of digital signal. In order to improve the performance of AD in sinogram restoration of low-dosed computed tomography (LDCT), we propose a new AD method, named regularized multidirections and multiscales anisotropic diffusion (RMDMS-AD), by extending AD to regularized AD (RAD) in multidirections and multiscales. Since the multidirections can reduce the discrete errors to the maximum extent, meanwhile multiscales and RAD make searching neighborhood of solution be as large as possible which can get more optimal solution to AD, the new proposed method can improve the performance of AD both in denoising and in stability of solution. Moreover, the discrete errors and ill-posed solutions occur mostly near the EADs; the RMDMS-AD will also preserve EADs well. Comparing the proposed new method to existing AD methods using real sinogram, the new method shows good performance in EADs preserving while denoising and suppressing artifacts. 1. Introduction Anisotropic diffusion (AD) proposed in 1990, also called Perona-Malik diffusion (PMD), is a technique aiming at reducing image details without removing significant parts of the image contents, typically edges, lines, or textures which are important for the image [1]. Formally, AD is defined as where is the initial gray scale image, is the smoothed gray scale image at time , denotes the gradient, is the divergence operator, and is the diffusion coefficient. controls the rate of diffusion and is usually chosen as a monotonically decreasing function of the module of the image gradient. The coefficients usually take the following two forms: where is the module of the vector and the constant controls the sensitivity to edges. The key idea of PMD is to smooth the homogenous regions with small while, near singularities with big , PMD is only smootheed along the perpendicular direction of the gradient. So far, much research has been devoted to improving the performance of PMD from the view of mathematical theory [2–11]. In 1992, Catté et al. indicate that PMD is ill-posed, and they also propose a new well-posed method named regularized anisotropic diffusion (RAD) [2]. Some recent efforts also focus on the illness of PMD and propose that posing some conditions on diffusion coefficients will make the PMD become well posed [3–6]. These conditions include posing edge influence functions near edges [3] and
Analysis on the Foucault pendulum by De Alembert Principle and Numerical Simulation
Zhiwu Zheng
Physics , 2015,
Abstract: In this paper, we handle the problem of the motion of the Foucault pendulum. We explore a new method induced from the De Alembert Principle giving the motional equations without small-amplitude oscillation approximation. The result of the problem is illustrated by numerical analysis showing the non-linear features and then with a comparison with a common method, showing the merit of this new original method. The result also shows that the argument changes in near-harmonic mode and the swing plane changes in pulsing way.
Instability of nonlinear dispersive solitary waves
Zhiwu Lin
Mathematics , 2008,
Abstract: We consider linear instability of solitary waves of several classes of dispersive long wave models. They include generalizations of KDV, BBM, regularized Boussinesq equations, with general dispersive operators and nonlinear terms. We obtain criteria for the existence of exponentially growing solutions to the linearized problem. The novelty is that we dealt with models with nonlocal dispersive terms, for which the spectra problem is out of reach by the Evans function technique. For the proof, we reduce the linearized problem to study a family of nonlocal operators, which are closely related to properties of solitary waves. A continuation argument with a moving kernel formula are used to find the instability criteria. Recently, these techniques have also been extended to study instability of periodic waves and to the full water wave problem.
Instability of large solitary water waves
Zhiwu Lin
Mathematics , 2008,
Abstract: We consider the linearized instability of 2D irrotational solitary water waves. The maxima of energy and the travel speed of solitary waves are not obtained at the highest wave, which has a 120 degree angle at the crest. Under the assumption of non-existence of secondary bifurcation which is confirmed numerically, we prove linear instability of solitary waves which are higher than the wave of maximal energy and lower than the wave of maximal travel speed. It is also shown that there exist unstable solitary waves approaching the highest wave. The unstable waves are of large amplitude and therefore this type of instability can not be captured by the approximate models derived under small amplitude assumptions. For the proof, we introduce a family of nonlocal dispersion operators to relate the linear instability problem with the elliptic nature of solitary waves. A continuity argument with a moving kernel formula is used to study these dispersion operators to yield the instability criterion.
The Equilibrium Statistical Model of Economic Systems using Concepts and Theorems of Statistical Physics
Zhiwu Zheng
Quantitative Finance , 2015,
Abstract: Economic systems are similar with physic systems for their large number of individuals and the exist of equilibrium. In this paper, we present a model applying the equilibrium statistical model in economic systems. Consistent with statistical physics, we define a series of concepts, such as economic temperature, economic pressure, economic potential, wealth and population. Moreover, we suggest that these parameters show pretty close relationship with the concepts in economy. This paper presents related concepts in the equilibrium economic model and constructs significant theorems and corollaries, which is derived from the priori possibility postulate, getting theorems including the equilibrium theorem between open systems, the distribution theorem of wealth and population along with related corollaries. More importantly, we demonstrate a method constructing optimal density of states, optimizing a macroscopic parameter depending on need to get the distribution of density of states utilizing the variation method, which is significant for the development of a society. In addition, we calculate a simple economic system as an example, indicating that the system occupied mostly by the middle class could develop stably and soundly, explaining the reason for resulting distributions of macroscopic parameters.
Target Image Classification through Encryption Algorithm Based on the Biological Features  [PDF]
Zhiwu Chen, Qing E. Wu, Weidong Yang
International Journal of Intelligence Science (IJIS) , 2015, DOI: 10.4236/ijis.2015.51002
Abstract: In order to effectively make biological image classification and identification, this paper studies the biological owned characteristics, gives an encryption algorithm, and presents a biological classification algorithm based on the encryption process. Through studying the composition characteristics of palm, this paper uses the biological classification algorithm to carry out the classification or recognition of palm, improves the accuracy and efficiency of the existing biological classification and recognition approaches, and compares it with existing main approaches of palm classification by experiments. Experimental results show that this classification approach has the better classification effect, the faster computing speed and the higher classification rate which is improved averagely by 1.46% than those of the main classification approaches.
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