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Search Results: 1 - 10 of 44355 matches for " WU Yonghong "
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Multi-Period Mean-Variance Portfolio Selection with State-Dependent Exit Probability and Bankruptcy State  [PDF]
Yang Wang, Yonghong Wu, Xinguang Zhang
Journal of Mathematical Finance (JMF) , 2019, DOI: 10.4236/jmf.2019.92008
Abstract: Based on the mean-variance portfolio selection under multi-period criterion, this paper focuses on the study of the uncertain time horizon and the regime-switching market including the bankruptcy state, where the conditional distribution of exit time is followed by the market state. When the market enters the bankruptcy state, investors are assumed to get back δ part of the wealth from the bankrupt company, where δ refers to the retrieval rate. By introducing the Lagrange multiplier λ, we create an innovative expression for the wealth process and the iterative representation of the value function to obtain the analytical expression of the optimal strategy and the corresponding efficient frontier. Besides, some special cases and numerical examples are presented to demonstrate the effects of state-dependent exit probability and bankruptcy state on the investment strategy.
Further results on differential inequality of a class of second order neutral type
Peiguang Wang,Yonghong Wu
Tamkang Journal of Mathematics , 2004, DOI: 10.5556/j.tkjm.35.2004.43-52
Abstract: In this paper, we develop several new results related to the nonexistence criteria for eventually positive solutions of a class of second order neutral differential inequalities with distributed deviating arguments. The work generalizes various existing result.
Oscillation of solutions for systems of hyperbolic equations of neutral type
Peiguang Wang,Yonghong Wu
Electronic Journal of Differential Equations , 2004,
Abstract: In this paper, we obtain sufficient conditions for the oscillation of solutions to systems of hyperbolic differential equations of neutral type. We consider such systems subject to two kinds of boundary conditions.
The Cost-Benefit Analysis for Bananas Diversity Production in China Foc. Zones  [PDF]
Linbing Xu, Bingzhi Huang, Yuanli Wu, Yonghong Huang, Tao Dong
American Journal of Plant Sciences (AJPS) , 2011, DOI: 10.4236/ajps.2011.24067
Abstract: Over 50 years ago, banana export plantations in Panama were ruined by Fusarium wilt race 1 (Foc. R1) since the popular cultivar Gros Michel is susceptible to Foc. R1 [1]. Fortunately, the resistant cultivar Cavendish replaced Gros Michel as the world biggest commercial fruit after ten years’ research and development. Due to its good economic profit, banana industry develops very fast recently in China. Unfortunately, Fusarium oxysporum f. sp. cubense tropical race 4 (TR4) brought disaster to Cavendish plantation since 1996. Most of traditional banana planting zones of Guangdong and Hainan provinces were infected by Foc. TR4 to the end of 2009. In order to fight against Foc. TR4, here we tried to investigate the cost-benefit and disease resistance of six banana cultivars (Cavendish Baxijiao, Dajiao, Guangfen No. 1, Fenzha No. 1, Gongjiao, Haigongjiao) planted in China Foc. Zones. Comparisons were conducted on their economic characteristics, cost, benefit, as well as the advantage and disadvantage and their application in rota-tion. Generally, supposing the investment of $ 4400/ha, the banana plantation attains a good economic profit as $ 2200/ha. Rotation of these cultivars can maintain the biodiversity as well as improve the sustainable development of banana industry.
Positive Solutions for Sturm-Liouville Boundary Value Problems in a Banach Space
Hua Su,Lishan Liu,Yonghong Wu
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/572172
Abstract: We consider the existence of single and multiple positive solutions for a second-order Sturm-Liouville boundary value problem in a Banach space. The sufficient condition for the existence of positive solution is obtained by the fixed point theorem of strict set contraction operators in the frame of the ODE technique. Our results significantly extend and improve many known results including singular and nonsingular cases.
Positive Solutions for Second-Order Singular Semipositone Differential Equations Involving Stieltjes Integral Conditions
Jiqiang Jiang,Lishan Liu,Yonghong Wu
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/696283
Abstract: By means of the fixed point theory in cones, we investigate the existence of positive solutions for the following second-order singular differential equations with a negatively perturbed term: ?()=[(,())?()], 0<<1, (0)?∫(0)=10()(), (1)
Positive Solutions of a Fractional Boundary Value Problem with Changing Sign Nonlinearity
Yongqing Wang,Lishan Liu,Yonghong Wu
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/149849
Abstract: We discuss the existence of positive solutions of a boundary value problem of nonlinear fractional differential equation with changing sign nonlinearity. We first derive some properties of the associated Green function and then obtain some results on the existence of positive solutions by means of the Krasnoselskii's fixed point theorem in a cone.
Positive Solutions for a Fractional Boundary Value Problem with Changing Sign Nonlinearity
Yongqing Wang,Lishan Liu,Yonghong Wu
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/214042
Abstract: We discuss the existence of positive solutions to the following fractional m-point boundary value problem with changing sign nonlinearity 0
Positive Solutions for Nonlinear Fractional Differential Equations with Boundary Conditions Involving Riemann-Stieltjes Integrals
Jiqiang Jiang,Lishan Liu,Yonghong Wu
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/708192
Abstract: We consider the existence of positive solutions for a class of nonlinear integral boundary value problems for fractional differential equations. By using some fixed point theorems, the existence and multiplicity results of positive solutions are obtained. The results obtained in this paper improve and generalize some well-known results.
Multiple positive solutions of Strum-Liouville equations with singularities
Zenggui Wang,Lishan Liu,Yonghong Wu
Discrete Dynamics in Nature and Society , 2006, DOI: 10.1155/ddns/2006/32018
Abstract: The existence of multiple positive solutions for Strum-Liouville boundary value problems with singularities is investigated. By applying a fixed point theorem of cone map, some existence and multiplicity results of positive solutions are derived. Our results improve and generalize those in some well-known results.
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