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Search Results: 1 - 10 of 149964 matches for " Le-Zhi Wang "
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Control and controllability of nonlinear dynamical networks: a geometrical approach
Le-Zhi Wang,Ri-Qi Su,Zi-Gang Huang,Xiao Wang,Wenxu Wang,Celso Grebogi,Ying-Cheng Lai
Physics , 2015,
Abstract: In spite of the recent interest and advances in linear controllability of complex networks, controlling nonlinear network dynamics remains to be an outstanding problem. We develop an experimentally feasible control framework for nonlinear dynamical networks that exhibit multistability (multiple coexisting final states or attractors), which are representative of, e.g., gene regulatory networks (GRNs). The control objective is to apply parameter perturbation to drive the system from one attractor to another, assuming that the former is undesired and the latter is desired. To make our framework practically useful, we consider RESTRICTED parameter perturbation by imposing the following two constraints: (a) it must be experimentally realizable and (b) it is applied only temporarily. We introduce the concept of ATTRACTOR NETWORK, in which the nodes are the distinct attractors of the system, and there is a directional link from one attractor to another if the system can be driven from the former to the latter using restricted control perturbation. Introduction of the attractor network allows us to formulate a controllability framework for nonlinear dynamical networks: a network is more controllable if the underlying attractor network is more strongly connected, which can be quantified. We demonstrate our control framework using examples from various models of experimental GRNs. A finding is that, due to nonlinearity, noise can counter-intuitively facilitate control of the network dynamics.
Preparation and Characterization of PEO―LATP/LAGP Ceramic Composite Electrolyte Membrane for Lithium Batteries
HUANG Le-Zhi, WEN Zhao-Yin, JIN Jun, LIU Yu
无机材料学报 , 2012, DOI: 10.3724/sp.j.1077.2012.00249
Abstract: A PEO―LATP/LAGP composite electrolyte for lithium batteries was designed and prepared. Uniformly composite electrolyte membrane with thickness of 20 μm was obtained by assembling Li1.4Al0.4Ti1.6(PO4)3 (LATP) or Li1.5Al0.5Ge1.5(PO4)3 (LAGP) as ceramic substrate and PEO as binder. Highest room―temperature conductivities were achieved for the sample prepared with w(ceramics):w(PEO)=7:3. Electrochemical analysis showed that the conductivity reached 0.186 mS/cm for PEO―LATP and 0.111 mS/cm for PEO―LAGP. Cycling performances of 170 mAh/g was obtained for the first discharge capacity of the Li/composite electrolyte/LiCo1/3Ni1/3Mn1/3O2 cell. Sharp decrease of cycling capacity was observed for the cell using PEO―LATP membrane. The cycling performance of the PEO―LAGP based cell was greatly improved with 150 mAh/g remained after 10 cycles.
Signal averaging for noise reduction in anesthesia monitoring and control with communication channels  [PDF]
Zhi-Bin Tan, Le-Yi Wang, Hong Wang
Journal of Biomedical Science and Engineering (JBiSE) , 2009, DOI: 10.4236/jbise.2009.27082
Abstract: This paper investigates impact of noise and signal averaging on patient control in anesthesia applications, especially in networked control system settings such as wireless connected systems, sensor networks, local area networks, or tele-medicine over a wide area network. Such systems involve communication channels which introduce noises due to quantization, channel noises, and have limited communication bandwidth resources. Usually signal averaging can be used effectively in reducing noise effects when remote monitoring and diagnosis are involved. However, when feedback is intended, we show that signal averaging will lose its utility substantially. To explain this phenomenon, we analyze stability margins under signal averaging and derive some optimal strategies for selecting window sizes. A typical case of anesthe-sia depth control problems is used in this development.
Study of blood fat concentration based on serum ultraviolet absorption spectra and neural network  [PDF]
Wei-Hua Zhu, Zhi-Min Zhao, Xin Guo, Le-Xin Wang, Hui Chen
Journal of Biomedical Science and Engineering (JBiSE) , 2009, DOI: 10.4236/jbise.2009.26057
Abstract: Blood plays an important role in the clinical di-agnosis and treatment, the analysis of blood will be of very important practical significance. The experiment shows that the absorption spectra of blood are of serious noise in the wave band of 200 to 300 nm, which hides the useful spectral characteristics. The effective separation of the noise was achieved by db4 wavelet transform, and the signals of reconstruction have been obviously improved in the noise serious wave band, reflecting some useful information. The absorption peaks of different samples are displaced to some degrees. The correlation between absorbance at 278nm and blood fat concentration is no significant and random. Based on the evident correlation between serum absorption spectrum and blood fat con-centration in the wave band of 265 to 282nm, a neural network model was built to forecast the blood fat concentration, bringing a relatively good prediction. This provides a new spectral test method of blood fat concentration.
The Gate Voltage Control of Long DNA Coherent Transport on Insulator Surface
Zhi-Jie Qin,Le Wang,Gui-Ping Zhang
Physics , 2015,
Abstract: We investigate the coherent transport properties of a DNA chain on a substrate which is subjected to a uniform electric field perpendicular to the surface. On the basis of the effective tight-binding model which simulates charge transport through DNA, the transmission coefficient, Lyapunov exponent, and localization length are numerically calculated by using the transfer-matrix method. It is found that an isolated extended state may appear at the Fermi level for a certain gate voltage when the interaction strength between the chain and the substrate is position dependent but independent of the base-pair sequence, leading to the gate voltage induced Metal-insulator transition (MIT). Moreover, conductance and current-voltage characteristics are also calculated. The relationship of Lyapunov exponent distribution to the current-voltage characteristics is discussed. Two different conduction mechanisms are proposed depending on effectively delocalized states and isolated extended states, respectively. These results may provide perspectives for experimental work aimed at controlling charge transport through DNA-based nanodevices.
Evaluation of EEG β2/θ -ratio and channel locations in measuring anesthesia depth  [PDF]
Zhi-Bin Tan, Le-Yi Wang, George McKelvey, Aliaksei Pustavoitau, Guang-Xiang Yu, Harold Michael Marsh, Hong Wang
Journal of Biomedical Science and Engineering (JBiSE) , 2010, DOI: 10.4236/jbise.2010.31006
Abstract: In this paper, the ratio of powers in the frequency bands of β2 and θ waves in EEG signals (termed as the β2/θ -ratio) was introduced as a potential enhancement in measuring anesthesia depth. The β2/θ -ratio was compared to the relative β-ratio which had been commercially used in the BIS monitor. Sensitivity and reliability of the β2/θ -ratio and EEG measurement locations were analyzed for their effectiveness in measuring anesthesia depth during different stages of propofol induced anesthesia (awake, induction, maintenance, and emergence). The analysis indicated that 1) the relative β -ratio and β2/θ-ratio derived from the prefrontal, frontal, and the central cortex EEG signals were of substantial sensitivity for capturing anesthesia depth changes. 2) Certain channel positions in the frontal part of the cortex, such as , had the combined benefits of substantial sensitivity and noise resistance. 3) The β2/θ-ratio captured the initial excitation, while the relative β -ratio did not. 4) In the maintenance and emergence stages, the β2/θ -ratio showed improved reliability. Implications: The ratio of powers in EEG frequency bands and derived from the frontal cortex EEG channels has combined benefits of substantial sensitivity and noise resistance in measuring anesthesia depth.
Coping style and mental health on high school students  [PDF]
Zhi Wang
Health (Health) , 2013, DOI: 10.4236/health.2013.52023
Abstract:

Objective: To explore the coping style of high school students and its relationship to mental health. Methods: Make a survey upon 320 students through coping style questionnaire and MSMH. Results: High school students often resort to problem solving and appeal to coping factors. No distinct gender difference is found in coping style. There are different degrees of correlation between coping style and mental health. Remarkable grade difference is shown in the factor of appealing in coping style and the three factors of compulsion, anxiety and mental imbalance in mental health. Conclusion: Relatively mature coping style has come into existence among high school students, but more guidance and assistance are in need in cultivating the coping style and improving the mental health.

An Exploration on the Relationship between Self-Concept and Parenting Style on Teenager  [PDF]
Zhi Wang
Psychology (PSYCH) , 2015, DOI: 10.4236/psych.2015.64048
Abstract: To explore the relationship between self-concept and parenting style, and to provide bases for improving self-concept on teenager, a total of 1000 teenager were tested with self-concept scale and parenting style scale. Total self-concept, self-concept of social orientation and self-concept of personal orientation were associated with factors of parenting style, which could predict total self-concept, self-concept of social orientation and self-concept of personal orientation. Factors of parenting style had the effects on the extents of total self-concept, self-concept of social orientation and self-concept of personal orientation of teenager.
Aberrant Expression of Oncogenic and Tumor-Suppressive MicroRNAs in Cervical Cancer Is Required for Cancer Cell Growth
Xiaohong Wang, Shuang Tang, Shu-Yun Le, Robert Lu, Janet S. Rader, Craig Meyers, Zhi-Ming Zheng
PLOS ONE , 2008, DOI: 10.1371/journal.pone.0002557
Abstract: MicroRNAs (miRNAs) play important roles in cancer development. By cloning and sequencing of a HPV16+ CaSki cell small RNA library, we isolated 174 miRNAs (including the novel miR-193c) which could be grouped into 46 different miRNA species, with miR-21, miR-24, miR-27a, and miR-205 being most abundant. We chose for further study 10 miRNAs according to their cloning frequency and associated their levels in 10 cervical cancer- or cervical intraepithelial neoplasia-derived cell lines. No correlation was observed between their expression with the presence or absence of an integrated or episomal HPV genome. All cell lines examined contained no detectable miR-143 and miR-145. HPV-infected cell lines expressed a different set of miRNAs when grown in organotypic raft cultured as compared to monolayer cell culture, including expression of miR-143 and miR-145. This suggests a correlation between miRNA expression and tissue differentiation. Using miRNA array analyses for age-matched normal cervix and cervical cancer tissues, in combination with northern blot verification, we identified significantly deregulated miRNAs in cervical cancer tissues, with miR-126, miR-143, and miR-145 downregulation and miR-15b, miR-16, miR-146a, and miR-155 upregulation. Functional studies showed that both miR-143 and miR-145 are suppressive to cell growth. When introduced into cell lines, miR-146a was found to promote cell proliferation. Collectively, our data indicate that downregulation of miR-143 and miR-145 and upregulation of miR-146a play a role in cervical carcinogenesis.
Content-Based Chinese Antique Books Retrieval Through Visual Similarity Criteria
基于视觉相似性的中文古籍内容检索方法

SHI Bai le,ZHANG Liang,WANG Yong,CHEN Zhi feng,
施伯乐
,张亮,王勇,陈智峰

软件学报 , 2001,
Abstract: The application of digitized civilization legacy plays an important role in the digital library project. Due to the intrinsic handwritten nature, it lacks effective mechanisms to perform content retrieval on digitized Chinese antique books. In this paper, an original method for content retrieval based on visual similarity is proposed and some key techniques are studied. By extracting morphological, positional and page features from images, the method makes up a feature space and applies spatial indexing to it. A range searching strategy is then employed to get all analogs to the query sample. In addition, a precision parameter is defined to dynamically adjust the mapping from morphological feature to semantics, and a constraint verifying technique is developed to improve the overall precision. The operational prototypical system demonstrates its fesibility and gets the effectiveness of automatic content-based retrieval directly on page images.
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