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By using Gaines and Mawhin's continuation theorem of coincidence degree theory, we studied the global existence of positive periodic solutions of a predator-prey diffusive model with ratio-dependence and feedback control. We obtain a set of verifiable sufficient conditions to guarantee the existence of positive periodic solutions of the system, which improve some known results.
This paper has analyzed the efficiency and the factors of Chinese university science parks using the DEA-Tobit model by the cross-section data in 2008. The results show: 21 university science parks are inefficient DMUs, and amongst 16 of them are ineffective vrste, five are ineffective scale. To improve the efficiency of the university science parks, the former should start with the vrste, namely...
Some species are cannibalistic and their lives can be divided into several stages. When this kind of species is predator, a stage-structured species model with time delay, Holling type IV functional response and cannibalism can be formulated. The sufficient condition for existence of positive periodic solution is obtained by using coincidence degree theory. Some new results are obtained.
Do-over Democratic primaries in 2008 election focused our attention on thinking about re-vote cost and reputation of e-voting system. On the other side, fraud behaviors discourage public confidence in such system. In this paper, we propose a novel mechanism in e-voting system to help voting management center make decision whether they should take action in re-vote. Trust and risk are brought in to...
This paper applies the analytic approach of the ecological footprint to calculate and compare the ecological footprint and the ecological capacity of Fujian province over the period from 1993 to 2002 and Taiwan province over two periods from 1981 to 1990 and from 1993 to 2002. The results indicate that land demand per capita of both Fujian and Taiwan increased year by year while the ecological capacity...
As e-commerce always suffers from the uncertainty, cheats and attacks, concepts of trust and risk are brought in to enhance on-line business. Several models or frameworks for dealing with uncertainty and threats in cyberspace have been proposed in the literature, but few explicitly consider trust and risk as two separate factors that influence different aspects of on-line interactions independently...
E-learning is a new learning model. Understand the learner's behavior is the foundation of e-learning. This essay present a multi-dimensional and multi-hierarchy model of e-learning behavior, based on this, it designed an E-learning behavior mine system. It used Web Services, data mine and CELTS to implement the system. Through the system, we can master the learner's characteristics and push them...
The problem of sellers pricing in electronic marketplaces can be ranked as a coordination games, the paper puts forward a agentspsila belief revision model and a learning algorithm which is based on the similarity of agentspsila strategies in coordination games. By position-exchanging, each agent stands from the viewpoint of its opponent and infers opponentspsila actions,. The belief revision model...
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