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Search Results: 1 - 10 of 24182 matches for " Zhongwei Jiang "
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The Positive Properties of Green’s Function for Fractional Differential Equations and Its Applications
Fuquan Jiang,Xiaojie Xu,Zhongwei Cao
Abstract and Applied Analysis , 2013, DOI: 10.1155/2013/531038
Abstract:
An Anonymous Authentication Scheme for Vehicle-to-Grid Networks  [PDF]
Zhongwei Sun
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2017, DOI: 10.4236/ijcns.2017.108B034
Abstract:
Vehicle to grid technology allows bidirectional energy exchange between electric vehicles and the power grid for achieving many known benefits. However, V2G networks suffer from certain security threats, such as EV’s privacy and authentication problem. In this paper, we propose an anonymous group authentication scheme for V2G communications. This scheme realizes dynamic joining and revocation of EVs, and greatly reduces the overhead of EV revocation. Through the theoretical analysis, this scheme can ensure identity privacy of EV user and security of data transmission in the process of charging and discharging.
A Note on Periodic Solutions of Second Order Nonautonomous Singular Coupled Systems
Zhongwei Cao,Chengjun Yuan,Daqing Jiang,Xiaowei Wang
Mathematical Problems in Engineering , 2010, DOI: 10.1155/2010/458918
Abstract: We establish the existence of periodic solutions of the second order nonautonomous singular coupled systems for a.e. , for a.e. . The proof relies on Schauder's fixed point theorem. 1. Introduction Some classical tools have been used in the literature to study the positive solutions for two-point boundary value problems of a coupled system of differential equations. These classical tools include some fixed point theorems in cones for completely continuous operators and Leray-Schauder fixed point theorem; for examples, see [1–3] and literatures therein. Recently, Schauder's fixed point theorem has been used to study the existence of positive solutions of periodic boundary value problems in several papers; see, for example, Torres [4], Chu et al. [5, 6], Cao and Jiang [7], and the references contained therein. However, there are few works on periodic solutions of second-order nonautonomous singular coupled systems. In these papers above, there are the major assumption that their associated Green's functions are positive. Since Green's functions are positive, in the paper, we continue to study the existence of periodic solutions to second-order nonautonomous singular coupled systems in the following form: with , Here we write if is an -caratheodory function, that is, the map is continuous for a.e. and the map is measurable for all and for every there exists such that for all and a.e. ; here “for a.e." means “for almost every". This paper is mainly motivated by the recent papers [4–6, 8, 9], in which the periodic singular problems have been studied. Some results in [4–6, 9] prove that in some situations weak singularities may help create periodic solutions. In [6], the authors consider the periodic solutions of second-order nonautonomous singular dynamical systems, in which the scalar periodic singular problems have been studied by Leray-Schauder alternative principle, a well-known fixed point theorem in cones, and Schauder's fixed point theorem, respectively. The remaining part of the paper is organized as follows. In Section 2, some preliminary results will be given. In Sections 3–5, by employing a basic application of Schauder's fixed point theorem, we state and prove the existence results for (1.1) under the nonnegative of the Green's function associated with (2.1)-(2.2). Our view point sheds some new light on problems with weak force potentials and proves that in some situations weak singularities may stimulate the existence of periodic solutions, just as pointed out in [9] for the scalar case. To illustrate our results, for example, we can select the
Detecting Specific Health-Related Events Using an Integrated Sensor System for Vital Sign Monitoring
Mourad Adnane,Zhongwei Jiang,Samjin Choi,Hoyoung Jang
Sensors , 2009, DOI: 10.3390/s90906897
Abstract: In this paper, a new method for the detection of apnea/hypopnea periods in physiological data is presented. The method is based on the intelligent combination of an integrated sensor system for long-time cardiorespiratory signal monitoring and dedicated signal-processing packages. Integrated sensors are a PVDF film and conductive fabric sheets. The signal processing package includes dedicated respiratory cycle (RC) and QRS complex detection algorithms and a new method using the respiratory cycle variability (RCV) for detecting apnea/hypopnea periods in physiological data. Results show that our method is suitable for online analysis of long time series data.
L. plantarum prevents Enteroinvasive Escherichia coli-induced tight junction proteins changes in intestinal epithelial cells
Huanlong Qin, Zhongwei Zhang, Xiaomin Hang, Yanqun Jiang
BMC Microbiology , 2009, DOI: 10.1186/1471-2180-9-63
Abstract: This study was to investigate the effect of L. plantarum on the changes of Caco-2 cells responding to Enteroinvasive Escherichia coli (EIEC), the permeability of cell monolayer and the transmissivity of dextran, and the distribution and expression of the tight junction (TJ) proteins, such as Claudin-1, Occludin, JAM-1 and ZO-1 were examined when infected with EIEC or adhesived of L. plantarum after infection by confocal laser scanning microscopy (CLSM), immunohistochemistry and Western blotting, the cytoskeleton protein F-actin were observed with FITC-phalloidin.This study demonstrated that the transepithelial electrical resistance (TER) step down and dextran integrated intensity (DII) step up with time after infected with EIEC, but after treating with L. plantarum, the changes of TER and DII were improved as compared with EIEC group. L. plantarum prevented the damage of expression and rearrangement of Claudin-1, Occludin, JAM-1 and ZO-1 proteins induced by EIEC, and could ameliorate the injury of cytoskeleton protein F-actin infected with EIEC.L. plantarum exerted a protective effect against the damage to integrity of Caco-2 monolayer cells and the structure and distribution of TJ proteins by EIEC infection.The intestinal epithelium forms a relatively impermeable barrier between the lumen and the submucosa. This barrier function is maintained by a complex of proteins composing the tight junction (TJ) that is located at the subapical aspect of the lateral membranes. The tight junctional complex comprises a large number of membrane-associated and membrane proteins, the latter including occludin, junction adhesion molecule (JAM), and claudins [1-4], which are responsible for forming the physical connections between cells that confer the basic barrier properties. These proteins are considered to be involved in the regulation of paracellular permeability. The TJ effect can be documented by reduction in transepithelial electrical resistance (TER). Some bacterial pathogen
Security and Privacy-Preserving Metering Service in the Smart Grid  [PDF]
Zhongwei Sun, Chuqi Song
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2017, DOI: 10.4236/ijcns.2017.108B033
Abstract:
The deployment of smart metering provides an immense amount of data for power grid operators and energy providers. By using this data, a more efficient and flexible power grid can be realized. However, this data also raises privacy concerns since it contains very sensitive information about customers. In this paper, we present a security and privacy-preserving metering scheme for the community customers, by utilizing the password authenticated key exchange (PAKE) protocol and Elliptic Curve Cryptosystem (ECC). The proposed scheme will protect the community network from possible malicious behavior, and security analysis is also given in the paper.
Modeling Transmission of Tuberculosis with MDR and Undetected Cases
Yongqi Liu,Zhendong Sun,Guiquan Sun,Qiu Zhong,Li Jiang,Lin Zhou,Yupeng Qiao,Zhongwei Jia
Discrete Dynamics in Nature and Society , 2011, DOI: 10.1155/2011/296905
Abstract: This paper presents a novel mathematical model with multidrug-resistant (MDR) and undetected TB cases. The theoretical analysis indicates that the disease-free equilibrium is globally asymptotically stable if ; otherwise, the system may exist a locally asymptotically stable endemic equilibrium. The model is also used to simulate and predict TB epidemic in Guangdong. The results imply that our model is in agreement with actual data and the undetected rate plays vital role in the TB trend. Our model also implies that TB cannot be eradicated from population if it continues to implement current TB control strategies. 1. Introduction China is among the highest TB burden countries in the world and is second only to India. The number of MDR-TB cases is about one third of that of the world [1, 2]. For an MDR-TB patient, the cost for the treatment is usually 10–100 times higher than that of a common TB patient [3]. Moreover, undetected TB patients pose threat to others, which plays a major role in mycobacterium transmission among the general population [4]. It is no doubt that the earlier the diagnosis and treatment, the better in attenuating the transmissions. Clearly, the understanding of the mechanism and contribution of undetected patients in transmission is important to conduct targeted interventions and control TB decease. Blower et al. proposed a transmission dynamics among the cases infected by drug-sensitive and the drug-resistant strains, respectively [5]. Many subsequent investigations focused on similar topics with various perspectives about the role of drug-resistant strain [3, 6–8]. However, these works failed to independently identify the role of the undetected patients in TB transmission. motivated by the previous work, we carefully divide the infectious cases into undetected cases and timely detected cases in this paper. This improved classification enables us to interpret the real situation in a better manner. To analyze the stability of the disease-free equilibrium in our transmission model, we introduce a novel Lyapunov function. We prove that the disease-free equilibrium is globally asymptotically stable when the basic reproduction number is less than one, and a forward (transcritical) bifurcation exists otherwise. While Guangdong is a developed province of China, the number of TB cases in Guangdong is about 10% of that of national TB cases. Mass migrants, MDR, and HIV/AIDS coinfections make the situation of TB transmission very complex in this region. We apply our model to describe the TB situation in Guangdong and simulate the distribution
Blow up Property of the Solution for Quasi Linear Parabolic Equations and Its Application
Zhongwei Zha
Journal of Mathematics Research , 2010, DOI: 10.5539/jmr.v2n2p51
Abstract: This dissertation is to discuss the initial-boundary value problem under the third nonlinear boundary condition for a kind of quasi-linear parabolic equations. To apply the maximum value theory and convex method, it is proved that the blowing up of solution in the definite time. And for application, this paper research into a mathematics model of fluids in porous medium. And have got the blowing up behavior for the problem in limited time.
Blowing up Solution of Initial-Boundary Value Problem for a Kind of Nonlinear Evolution Equations
Zhongwei Zha
Journal of Mathematics Research , 2011, DOI: 10.5539/jmr.v3n1p107
Abstract: This dissertation is to discuss the initial-boundary value problem under the third nonlinear boundary condition for a kind of nonlinear evolution equations. To apply the maximum value theory and convex functional method£it is proved that the blowing up of solution in the definite time under some assumed conditions. The conclusion popularizes the results of references [Zhongwei Zha(2003)-Zhongwei Zha(2010)].
On Estimates of Biharmonic Functions on Lipschitz and Convex Domains
Zhongwei Shen
Mathematics , 2005,
Abstract: Using Maz'ya type integral identities with power weights, we obtain new boundary estimates for biharmonic functions on Lipschitz and convex domains in $R^n$. For $n\ge 8$, combined with a result in \cite{S2}, these estimates lead to the solvability of the $L^p$ Dirichlet problem for the biharmonic equation on Lipschitz domains for a new range of $p$. In the case of convex domains, the estimates allow us to show that the $L^p$ Dirichlet problem is uniquely solvable for any $2-\e
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