The technique of incremental updating,which can better guarantee the real-time situation of navigational map,is the developing orientation of navigational road network updating.The data center of vehicle navigation sy...The technique of incremental updating,which can better guarantee the real-time situation of navigational map,is the developing orientation of navigational road network updating.The data center of vehicle navigation system is in charge of storing incremental data,and the spatio-temporal data model for storing incremental data does affect the efficiency of the response of the data center to the requirements of incremental data from the vehicle terminal.According to the analysis on the shortcomings of several typical spatio-temporal data models used in the data center and based on the base map with overlay model,the reverse map with overlay model (RMOM) was put forward for the data center to make rapid response to incremental data request.RMOM supports the data center to store not only the current complete road network data,but also the overlays of incremental data from the time when each road network changed to the current moment.Moreover,the storage mechanism and index structure of the incremental data were designed,and the implementation algorithm of RMOM was developed.Taking navigational road network in Guangzhou City as an example,the simulation test was conducted to validate the efficiency of RMOM.Results show that the navigation database in the data center can response to the requirements of incremental data by only one query with RMOM,and costs less time.Compared with the base map with overlay model,the data center does not need to temporarily overlay incremental data with RMOM,so time-consuming of response is significantly reduced.RMOM greatly improves the efficiency of response and provides strong support for the real-time situation of navigational road network.展开更多
A new lane-level road modeling method based on cardinal spline is proposed for the special intersections which are covered by vegetation or artificial landscape in their central regions.First,cardinal spline curves ar...A new lane-level road modeling method based on cardinal spline is proposed for the special intersections which are covered by vegetation or artificial landscape in their central regions.First,cardinal spline curves are used to fit the virtual lanes inside special intersections,and an initial road model is established using a series of control points and tension parameters.Then,the progressive optimization algorithm is proposed to determine the final road model based on the initial model.The algorithm determines reasonable control points and optimal tension parameters according to the degree of road curvature changes,so as to achieve a balance between the efficiency and reliability of the road model.Finally,the proposed intersection model is verified and evaluated through experiments.The results show that this method can effectively describe the lane-level topological relationship and geometric details of this kind of special intersection where the central area is covered by vegetation or artificial landscape,and can achieve a good balance between the efficiency and reliability of the road model.展开更多
This paper proposes a comparison between the Chinese social-economic system of today and the economic planning system theorized by Enrico Barone in 1908, which described in his famous paper ＂The minister of productio...This paper proposes a comparison between the Chinese social-economic system of today and the economic planning system theorized by Enrico Barone in 1908, which described in his famous paper ＂The minister of production in the collectivist state＂. The work stems from a critical reflection on the premises of the capitalist market system. From Adam Smith to J. M. Keynes （included）, economists have identified in traditional capitalist models （search for maximum profit, economic efficiency, free competition system） the best economic system, universally implementable, feasible and infallible in democratic capitalist contexts. In the history of economic ideas have always been clear gap between the ＂capitalist system＂ and the ＂collectivist system＂. The choice of a government had to fall back on one or on the other system. The first considered ＂good＂, the second considered ＂bad＂ for economic growth. Times since September 11, 2001, however, seem to have debunked the myth of capitalism as the only model of democratic growth： Asia and China have given the world a lesson in humility. China has shown that although not being a democratic country could developed a robust and highly competitive economic model that has weakened the pillars of the western capitalism. China through Confucianism and Taoism has been able to establish the new global economic laws： low labour costs, low prices, mass production of low quality with a mixed mercantilist philosophy which is unknown to the Western world： the silent, smooth, radical trade expansion. As in a game of dominoes, China has been able to drop the capitalism safeties and America had to bow its head and agree to no longer be the only great power in the international scenario. But the peculiarity of this work is not only to define the root causes of China＇s success in the West; also reflects the fact that an Italian economist （Enrico Barone）, in 1908, predicted analytically and developed a theoretical system very similar to that of China nowadays, between capitalism and collectivism （a third way of the market）. The Asian culture has developed a market system that has proven to be accommodating to the needs of the capitalist market and to grasp the development opportunities that the same Western capitalism has offered.展开更多
基金Under the auspices of National High Technology Research and Development Program of China (No.2007AA12Z242)
文摘The technique of incremental updating,which can better guarantee the real-time situation of navigational map,is the developing orientation of navigational road network updating.The data center of vehicle navigation system is in charge of storing incremental data,and the spatio-temporal data model for storing incremental data does affect the efficiency of the response of the data center to the requirements of incremental data from the vehicle terminal.According to the analysis on the shortcomings of several typical spatio-temporal data models used in the data center and based on the base map with overlay model,the reverse map with overlay model (RMOM) was put forward for the data center to make rapid response to incremental data request.RMOM supports the data center to store not only the current complete road network data,but also the overlays of incremental data from the time when each road network changed to the current moment.Moreover,the storage mechanism and index structure of the incremental data were designed,and the implementation algorithm of RMOM was developed.Taking navigational road network in Guangzhou City as an example,the simulation test was conducted to validate the efficiency of RMOM.Results show that the navigation database in the data center can response to the requirements of incremental data by only one query with RMOM,and costs less time.Compared with the base map with overlay model,the data center does not need to temporarily overlay incremental data with RMOM,so time-consuming of response is significantly reduced.RMOM greatly improves the efficiency of response and provides strong support for the real-time situation of navigational road network.
基金The National Natural Science Foundation of China(No.61973079,61273236)the Program for Special Talents in Six Major Fields of Jiangsu Province(No.2017JXQC-003)。
文摘A new lane-level road modeling method based on cardinal spline is proposed for the special intersections which are covered by vegetation or artificial landscape in their central regions.First,cardinal spline curves are used to fit the virtual lanes inside special intersections,and an initial road model is established using a series of control points and tension parameters.Then,the progressive optimization algorithm is proposed to determine the final road model based on the initial model.The algorithm determines reasonable control points and optimal tension parameters according to the degree of road curvature changes,so as to achieve a balance between the efficiency and reliability of the road model.Finally,the proposed intersection model is verified and evaluated through experiments.The results show that this method can effectively describe the lane-level topological relationship and geometric details of this kind of special intersection where the central area is covered by vegetation or artificial landscape,and can achieve a good balance between the efficiency and reliability of the road model.
文摘This paper proposes a comparison between the Chinese social-economic system of today and the economic planning system theorized by Enrico Barone in 1908, which described in his famous paper ＂The minister of production in the collectivist state＂. The work stems from a critical reflection on the premises of the capitalist market system. From Adam Smith to J. M. Keynes （included）, economists have identified in traditional capitalist models （search for maximum profit, economic efficiency, free competition system） the best economic system, universally implementable, feasible and infallible in democratic capitalist contexts. In the history of economic ideas have always been clear gap between the ＂capitalist system＂ and the ＂collectivist system＂. The choice of a government had to fall back on one or on the other system. The first considered ＂good＂, the second considered ＂bad＂ for economic growth. Times since September 11, 2001, however, seem to have debunked the myth of capitalism as the only model of democratic growth： Asia and China have given the world a lesson in humility. China has shown that although not being a democratic country could developed a robust and highly competitive economic model that has weakened the pillars of the western capitalism. China through Confucianism and Taoism has been able to establish the new global economic laws： low labour costs, low prices, mass production of low quality with a mixed mercantilist philosophy which is unknown to the Western world： the silent, smooth, radical trade expansion. As in a game of dominoes, China has been able to drop the capitalism safeties and America had to bow its head and agree to no longer be the only great power in the international scenario. But the peculiarity of this work is not only to define the root causes of China＇s success in the West; also reflects the fact that an Italian economist （Enrico Barone）, in 1908, predicted analytically and developed a theoretical system very similar to that of China nowadays, between capitalism and collectivism （a third way of the market）. The Asian culture has developed a market system that has proven to be accommodating to the needs of the capitalist market and to grasp the development opportunities that the same Western capitalism has offered.
