Regional cities in Japan are at the risk of experiencing big fire accidents or earthquakes every day.However,neither the number nor the capacity of shelters has increased because local governments might not consider t...Regional cities in Japan are at the risk of experiencing big fire accidents or earthquakes every day.However,neither the number nor the capacity of shelters has increased because local governments might not consider them owing to budget shortfall.By contrast,wide-area evacuation simulations can easily provide an antagonizing image of regional urban disasters.After a disaster,the city collapses and the evacuation routes are closed;consequently,evacuees feel anxious and they cannot move as usual.This anxiety behavior has not been considered in previous related studies and simulations.In this study,a wide-area evacuation simulation is developed;this model can not only calculate the possibility of blocking escape routes when the city is broken but also provide safe and more realistic evacuation plans before a disaster occurs by incorporating into the simulation the risk avoidance behaviors of evacuees from road blockage,such as“the route re-seeking behavior”and“the shelter re-selecting behavior”.展开更多
In this paper, the problems of modeling and analyzing the system with changeable boundary are researched. First, a kind of expanding system is set up, in which the changeable boundary is dealt with as a regional bound...In this paper, the problems of modeling and analyzing the system with changeable boundary are researched. First, a kind of expanding system is set up, in which the changeable boundary is dealt with as a regional boundary. Then some relative models are developed to describe the regional boundary system. Next, the transition or the driftage of bifurcation points in the system is discussed A fascinating case is studied in which two or more than two classes of chaotic attractive points coexist together or exist alternatively in the same system. Lastly, an effective new method of chaos avoidance for the system is put forward.展开更多
Rotation is a practice whereby officials are regularly moved between equally ranked positions.Focusing on governor rotation,this paper examines the effect of official rotation on corporate innovation in China.First,we...Rotation is a practice whereby officials are regularly moved between equally ranked positions.Focusing on governor rotation,this paper examines the effect of official rotation on corporate innovation in China.First,we find that official rotation significantly promotes corporate innovation,including enterprises’innovation investment,quantity,and quality.Second,we find that the effect of official rotation on corporate innovation varies because of official and regional heterogeneity.Officials rotating from other provinces significantly stimulate corporate innovation,but officials rotating from the central government have an insignificant influence on corporate innovation.In addition,offi-cials rotating to non-eastern regions significantly enhance corporate innovation,while officials rotating to eastern regions have a negligible impact on corporate innovation.We further examine the driving mechanism behind the effect of official rotation on corporate innovation and find that officials rotating from eastern regions to non-eastern regions can significantly promote corporate innovation,but officials rotating from non-eastern regions to eastern regions do not boost corporate innovation.These findings imply that the different effects of official rotation on corporate innovation are due to the official experience effect.We also find that official rotation can promote corporate innovation through reducing corporate charitable donations and increasing corporate innovation subsidies.In a supplementary analysis,we find that GDP-oriented performance appraisal pressure weakens the effect of official rotation on corporate innovation.The lower the pressure on officials regarding their performance,the more significant the effect of official rotation on corporate innovation.In addition,official rotation can significantly promote the development of the regional economy and improve the GDP growth rate via corporate innovation,which is a micro-level economic growth effect of official rotation.Overall,our findings further verify the economic effect of official rotation and extend our understanding of the influencing factors of corporate inno-vation from the perspective of the official governance system.Our findings also have clear policy implications for how the government can improve the official governance model to promote corporate innovation during the transition period of the national innovation system.展开更多
文摘Regional cities in Japan are at the risk of experiencing big fire accidents or earthquakes every day.However,neither the number nor the capacity of shelters has increased because local governments might not consider them owing to budget shortfall.By contrast,wide-area evacuation simulations can easily provide an antagonizing image of regional urban disasters.After a disaster,the city collapses and the evacuation routes are closed;consequently,evacuees feel anxious and they cannot move as usual.This anxiety behavior has not been considered in previous related studies and simulations.In this study,a wide-area evacuation simulation is developed;this model can not only calculate the possibility of blocking escape routes when the city is broken but also provide safe and more realistic evacuation plans before a disaster occurs by incorporating into the simulation the risk avoidance behaviors of evacuees from road blockage,such as“the route re-seeking behavior”and“the shelter re-selecting behavior”.
基金This research is supported by the National Natural Science Foundation of China(No.79990580).
文摘In this paper, the problems of modeling and analyzing the system with changeable boundary are researched. First, a kind of expanding system is set up, in which the changeable boundary is dealt with as a regional boundary. Then some relative models are developed to describe the regional boundary system. Next, the transition or the driftage of bifurcation points in the system is discussed A fascinating case is studied in which two or more than two classes of chaotic attractive points coexist together or exist alternatively in the same system. Lastly, an effective new method of chaos avoidance for the system is put forward.
基金support from the Fundamental Research Funds for the Central Universities,China(No.JBK1807085)the National Natural Science Foundation of China(No.71902006)Scientific Research Program of Beijing Municipal Education Commission(No.SM202010011007)
文摘Rotation is a practice whereby officials are regularly moved between equally ranked positions.Focusing on governor rotation,this paper examines the effect of official rotation on corporate innovation in China.First,we find that official rotation significantly promotes corporate innovation,including enterprises’innovation investment,quantity,and quality.Second,we find that the effect of official rotation on corporate innovation varies because of official and regional heterogeneity.Officials rotating from other provinces significantly stimulate corporate innovation,but officials rotating from the central government have an insignificant influence on corporate innovation.In addition,offi-cials rotating to non-eastern regions significantly enhance corporate innovation,while officials rotating to eastern regions have a negligible impact on corporate innovation.We further examine the driving mechanism behind the effect of official rotation on corporate innovation and find that officials rotating from eastern regions to non-eastern regions can significantly promote corporate innovation,but officials rotating from non-eastern regions to eastern regions do not boost corporate innovation.These findings imply that the different effects of official rotation on corporate innovation are due to the official experience effect.We also find that official rotation can promote corporate innovation through reducing corporate charitable donations and increasing corporate innovation subsidies.In a supplementary analysis,we find that GDP-oriented performance appraisal pressure weakens the effect of official rotation on corporate innovation.The lower the pressure on officials regarding their performance,the more significant the effect of official rotation on corporate innovation.In addition,official rotation can significantly promote the development of the regional economy and improve the GDP growth rate via corporate innovation,which is a micro-level economic growth effect of official rotation.Overall,our findings further verify the economic effect of official rotation and extend our understanding of the influencing factors of corporate inno-vation from the perspective of the official governance system.Our findings also have clear policy implications for how the government can improve the official governance model to promote corporate innovation during the transition period of the national innovation system.
