Now GIS is turning into a good tool in handling geographical, economical, and population data, so we can obtain more and more information from these data. On the other hand, in some cases, for a calamity, such as hurr...Now GIS is turning into a good tool in handling geographical, economical, and population data, so we can obtain more and more information from these data. On the other hand, in some cases, for a calamity, such as hurricane, earthquake, flood, drought etc., or a decision-making, such as setting up a broadcasting transmitter, building a chemical plant etc., we have to evaluate the total population in the region influenced by a calamity or a project. In this paper, a method is put forward to evaluate the population in such special region. Through exploring the correlation of geographical parameters and the distribution of people in the same region by means of quantitative analysis and qualitative analysis, unit population database (1km× 1km) is established. In this way, estimating the number of people in a special region is capable by adding up the population in every grid involved in this region boundary. The geographical parameters are obtained from topographic database and DEM database on the scale of 1: 250 000. The fundamental geographical parameter database covering county administrative boundaries and 1km × 1km grid is set up and the population database at county level is set up as well. Both geographical parameter database and unit population database are able to oiler sufficient conditions for quantitative analysis. They will have important role in the research fields of data mining (DM), Decision-making Support Systems (DSS), and regional sustainable development.展开更多
This paper examines the transition of growth stage China is about to experience and the main conclusions are as follows： （1） Phase Ⅰ of economic growth driven by investment and export is losing the momentum of eff...This paper examines the transition of growth stage China is about to experience and the main conclusions are as follows： （1） Phase Ⅰ of economic growth driven by investment and export is losing the momentum of efficiency enhancement through intervention and the growth stage of efficiency enhancement through structural adjustment is coming to an end. Urbanization and the development of service sector will inaugurate Phase Ⅱ of stable economic growth characterized by structural optimization through efficiency enhancement; （2） Three leading factors promoting the transition from Phase Ⅰ to Phase Ⅱ include： demographic changes and the emergence of workforce turning point, the reversion of factor elasticity parameters of long-term growth function, and service-oriented economic structure; （3） Developed provinces and municipalities in east China have already entered into the channel of economic deceleration. With increasing urbanization rate, accelerating service-oriented structure and declining demographic dividend after 2016, China＇s economic slowdown would be inevitable if labor productivity fails to improve.展开更多
In this paper, we introduce the stochasticity into an HIV-1 infection model with cytotoxic T lymphocytes （CTLs） immune response via the technique of parameter perturbation. We show that there is a positive solution ...In this paper, we introduce the stochasticity into an HIV-1 infection model with cytotoxic T lymphocytes （CTLs） immune response via the technique of parameter perturbation. We show that there is a positive solution as desired in any population dynamics. Then we analyze the long time behavior of this model. We obtain a sufficient condition for the stochastic asymptotic stability in the large of the infection-free equilibrium and give the conditions for the solution fluctuating around the two infection equilibria （one without CTLs being activated and the other with）. Finally, we make sinmlations to conform to our analytical results.展开更多
基金Under the auspices of the High-tech Research and Development(863)Program(No.2001AA135080)Technology Base Project Foundation of the Ministry of Science and Technology of China in 2000the National Social Science Foundation of China(No.00
文摘Now GIS is turning into a good tool in handling geographical, economical, and population data, so we can obtain more and more information from these data. On the other hand, in some cases, for a calamity, such as hurricane, earthquake, flood, drought etc., or a decision-making, such as setting up a broadcasting transmitter, building a chemical plant etc., we have to evaluate the total population in the region influenced by a calamity or a project. In this paper, a method is put forward to evaluate the population in such special region. Through exploring the correlation of geographical parameters and the distribution of people in the same region by means of quantitative analysis and qualitative analysis, unit population database (1km× 1km) is established. In this way, estimating the number of people in a special region is capable by adding up the population in every grid involved in this region boundary. The geographical parameters are obtained from topographic database and DEM database on the scale of 1: 250 000. The fundamental geographical parameter database covering county administrative boundaries and 1km × 1km grid is set up and the population database at county level is set up as well. Both geographical parameter database and unit population database are able to oiler sufficient conditions for quantitative analysis. They will have important role in the research fields of data mining (DM), Decision-making Support Systems (DSS), and regional sustainable development.
文摘This paper examines the transition of growth stage China is about to experience and the main conclusions are as follows： （1） Phase Ⅰ of economic growth driven by investment and export is losing the momentum of efficiency enhancement through intervention and the growth stage of efficiency enhancement through structural adjustment is coming to an end. Urbanization and the development of service sector will inaugurate Phase Ⅱ of stable economic growth characterized by structural optimization through efficiency enhancement; （2） Three leading factors promoting the transition from Phase Ⅰ to Phase Ⅱ include： demographic changes and the emergence of workforce turning point, the reversion of factor elasticity parameters of long-term growth function, and service-oriented economic structure; （3） Developed provinces and municipalities in east China have already entered into the channel of economic deceleration. With increasing urbanization rate, accelerating service-oriented structure and declining demographic dividend after 2016, China＇s economic slowdown would be inevitable if labor productivity fails to improve.
基金We would like to thank the editor and referee for their very helpful comments and suggestions. We also thank the National Natural Science Foundation of China （No. 10971021）, the Ministry of Education of China （No. 109051）, the Ph.D. Pro- grams Foundation of Ministry of China （No. 200918） and the Graduate Innovative Research Project of NENU （No. 09SSXTl17） for their financial support.
文摘In this paper, we introduce the stochasticity into an HIV-1 infection model with cytotoxic T lymphocytes （CTLs） immune response via the technique of parameter perturbation. We show that there is a positive solution as desired in any population dynamics. Then we analyze the long time behavior of this model. We obtain a sufficient condition for the stochastic asymptotic stability in the large of the infection-free equilibrium and give the conditions for the solution fluctuating around the two infection equilibria （one without CTLs being activated and the other with）. Finally, we make sinmlations to conform to our analytical results.
