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Search Results: 1 - 10 of 42553 matches for " Ying He "
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Positive Solutions for Singular Boundary Value Problems of Coupled Systems of Nonlinear Differential Equations  [PDF]
Ying He
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.29102

We establish the existence of positive solutions for singular boundary value problems of coupled systems \"\"

The proof relies on Schauder’s fixed point theorem. Some recent results in the literature are generalized and improved.

Existence and Uniqueness of Positive Solutions for Fourth-Order Nonlinear Singular Sturm-Liouville Problems  [PDF]
Ying He
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.29099

By mixed monotone method, we establish the existence and uniqueness of positive solutions for fourth-order nonlinear singular Sturm-Liouville problems. The theorems obtained are very general and complement previously known results.

Existence Theory for Single Positive Solution to Fourth-Order Boundary Value Problems  [PDF]
Ying He
Advances in Pure Mathematics (APM) , 2014, DOI: 10.4236/apm.2014.48053

By fixed point theorem of a mixed monotone operator, we study boundary value problems to nonlinear singular fourth-order differential equations, and provide sufficient conditions for the existence and uniqueness of positive solution. The nonlinear term in the differential equation may be singular.

Environmental Management within Projects
Ying He
International Journal of Business and Management , 2009, DOI: 10.5539/ijbm.v5n1p205
Abstract: The role of environmental management within projects is playing a more and more essential part to the firms and public. Because of the benefit of implementing environmental management, different methods are being used to improve environmental management in projects especially in industry. However, the application of these methods leads to an increase in labor use, materials costs and other costs, which can limit their implementation. This paper provides the benefits and the barriers to the implementation of environmental management within projects, and some effect ways to improve it. It should help stakeholders to adjust their environmental management policy by efficient resources distribution within their firms.
Jump Intervals of Stock Price Have Power-Law Distribution: An Empirical Study  [PDF]
Hongduo Cao, Ying Li, Huaping He, Zhi He
Journal of Mathematical Finance (JMF) , 2016, DOI: 10.4236/jmf.2016.65053
Abstract: Taking the power-law behavior of human activities into consideration, we conduct an empirical study on the distribution of jump intervals after using BNS nonparametric method to detect jumps in 5 min closing data of HIS. Our result shows that there is a “power law” in jump intervals, and Fokker-Planck distribution is the more suitable distribution to describe jump intervals than the traditional Poisson process. So the jump diffusion model of power law can depict the movement of stock price more accurately.
Facile Synthesis of Polypyrrole/Titanate Core-Shell Nanorods and Their Electrorheological Characteristics  [PDF]
Jiexu Zhang, Ying He, Lijun Ji
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.22015
Abstract: In this work, polypyrrole (PPy)/titanate (TN) composite nanorods were successfully synthesized using cetyl trimethyl-ammonium bromide (CTAB) as a structure-directing agent by in situ chemical oxidative polymerization. The structural characterization indicated that the new composite rods were core (TN)-shell (PPy) nanostructure with the average diameter in the range of 250-300 nm. Further, this semiconducting composite can be used as a dispersed phase in silicone oil for a new electrorheological (ER) fluid, and its ER behavior was investigated under steady and oscillatory shear. It was found that the PPy/TN fluid showed typical ER characteristics under an external electric field.
Study on group intervention regarding interpersonal trust among college students with campus psychodrama  [PDF]
Ying Ge, Huamin He, Linna Dai
Health (Health) , 2011, DOI: 10.4236/health.2011.37076
Abstract: Purpose: To explore the interventional effects of campus psychodrama on improving the interpersonal trust among college students. Methods: 16 college students with low levels of interpersonal trust were selected to conduct 5 sessions of psychodrama therapy. Results: The subject group has gone through stages of ice breaking, performance, and sharing. Through group counseling with psychodrama, the social avoidance and distressful behaviors of the subjects have been alleviated, and their levels of interpersonal trust demonstrated notable change. Conclusion: Campus psychodrama is an effective group counseling approach for improving college students’ interpersonal trust.
Irreducibility and uniqueness of stationary distribution
Ping He,Jiangang Ying
Mathematics , 2009,
Abstract: In this paper, we shall prove that the irreducibility in the sense of fine topology implies the uniqueness of invariant probability measures. It is also proven that this irreducibility is strictly weaker than the strong Feller property plus irreducibility in the sense of original topology, which is the usual uniqueness condition.
Discussion paper. Conditional growth charts
Ying Wei,Xuming He
Mathematics , 2007, DOI: 10.1214/009053606000000623
Abstract: Growth charts are often more informative when they are customized per subject, taking into account prior measurements and possibly other covariates of the subject. We study a global semiparametric quantile regression model that has the ability to estimate conditional quantiles without the usual distributional assumptions. The model can be estimated from longitudinal reference data with irregular measurement times and with some level of robustness against outliers, and it is also flexible for including covariate information. We propose a rank score test for large sample inference on covariates, and develop a new model assessment tool for longitudinal growth data. Our research indicates that the global model has the potential to be a very useful tool in conditional growth chart analysis.
Rejoinder: Conditional Growth Charts
Ying Wei,Xuming He
Mathematics , 2007, DOI: 10.1214/009053606000000678
Abstract: Rejoinder: Conditional Growth Charts [math.ST/0702634]
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