Industrial clusters have been an important phenomenon of the global economy. The most important reason for its becoming the focus of people＇s attention and the popular mode of industry programming is continuous and p...Industrial clusters have been an important phenomenon of the global economy. The most important reason for its becoming the focus of people＇s attention and the popular mode of industry programming is continuous and powerful competitiveness ,The article analyzes this competitiveness, and points out some problems of China＇s industrial clusters, which directly affects its current competitiveness and further development. Finally, we propose stone specific measures of those problems.展开更多
How to energy-efficiently maintain the topology of wireless sensor networks(WSNs) is still a difficult problem because of their numerous nodes,highly dynamic nature,varied application scenarios and limited resources.A...How to energy-efficiently maintain the topology of wireless sensor networks(WSNs) is still a difficult problem because of their numerous nodes,highly dynamic nature,varied application scenarios and limited resources.An energy-efficient multi-mode clusters maintenance(M2CM) method is proposed based on localized and event-driven mechanism in this work,which is different from the conventional clusters maintenance model with always periodically re-clustered among the whole network style based on time-trigger for hierarchical WSNs.M2 CM can meet such demands of clusters maintenance as adaptive local maintenance for the damaged clusters according to its changes in time and space field.,the triggers of M2 CM include such events as nodes' residual energy being under the threshold,the load imbalance of cluster head,joining in or exiting from any cluster for new node or disable one,etc.Based on neighboring relationship of the damaged clusters,one can start a single cluster(inner-cluster) maintenance or clusters(inter-cluster) maintenance program to meet diverse demands in the topology management of hierarchical WSNs.The experiment results based on NS2 simulation show that the proposed method can significantly save energy used in maintaining a damaged network,effectively narrow down the influenced area of clusters maintenance,and increase transmitted data and prolong lifetime of network compared to the traditional schemes.展开更多
Industries that suitable for cluster innovation are often intensive in knowledge and technology, with high capital agglomeration; closely interact and corporate with each other through resources sharing. Its developme...Industries that suitable for cluster innovation are often intensive in knowledge and technology, with high capital agglomeration; closely interact and corporate with each other through resources sharing. Its development is depend on many factors, such as technical reliability, human resources, its own growth potential, competition, market prospects, and the government policies, etc.. Aimed at clarifying the path selection mechanism of cluster innovation, this paper first analyze the connotation of cluster innovation and its inside factors＇ bonding relationship, then exploring the triggers and path forming dimensions of cluster innovation. Finally, it builds a path-selection model on cluster innovation, and discusses the characteristics of each side.展开更多
Polarization mode dispersion(PMD) is considered to be the ultimate limitation in high-speed optical fiber communication systems. Establishing an effective control algorithm for adaptive PMD compensation is a challengi...Polarization mode dispersion(PMD) is considered to be the ultimate limitation in high-speed optical fiber communication systems. Establishing an effective control algorithm for adaptive PMD compensation is a challenging task, because PMD possesses the time-varying and statistical properties. The particle swarm optimization(PSO) algorithm is introduced into self-adaptive PMD compensation as feedback control algorithm. The experiment results show that PSO-based control algorithm has some unique features of rapid convergence to the global optimum without being trapped in local sub-optima and good robustness to noise in the optical fiber transmission line that has never been achieved in PMD compensation before.展开更多
Public service platform of industrial cluster includes Industry Association, Guarantee Agency, Productivity Center, R＆D Center, Inspection and Test Center, Training Institutions, Product Center and Professional Marke...Public service platform of industrial cluster includes Industry Association, Guarantee Agency, Productivity Center, R＆D Center, Inspection and Test Center, Training Institutions, Product Center and Professional Market, etc. By case study in Hubei province, local government and leading enterprises, they are the major part of public service platform constructing of industrial cluster.展开更多
The Industrial Clusters show more competitive advantage in the world obviously since 1970＇s, which attracts extensive attention from all over the world. As the most important researches of the New Economic Geography,...The Industrial Clusters show more competitive advantage in the world obviously since 1970＇s, which attracts extensive attention from all over the world. As the most important researches of the New Economic Geography, Poter＇s diamond model generalizes the internal mechanism of clusters, but the model has not given the microcosmic status of the factors of the clusters, therefore, it is significant to go deeper into the diamond model and the dissertation wishes to do some researches deeply.Based on the actuality of research, this paper surveys Porter＇s diamond model from the Evolutionary Economics, and combines the research of the field with the instance in China, then puts forward the diamond model of twin-screw and implements the model into traditional industrial clusters in Zheiiang province. Detailed explaining is as follows. The main innovations of the dissertation are as follows： （1） having taken the points of biology into economics, and developing the Evolutionary Economics creatively; （2） having proved the diamond model, put forward a twin-screw microcosmic model for the first time, and tried to study the dynamic and solid relationships of each factor in the diamond model, which is the most important innovation of the dissertation.展开更多
文摘Industrial clusters have been an important phenomenon of the global economy. The most important reason for its becoming the focus of people＇s attention and the popular mode of industry programming is continuous and powerful competitiveness ,The article analyzes this competitiveness, and points out some problems of China＇s industrial clusters, which directly affects its current competitiveness and further development. Finally, we propose stone specific measures of those problems.
基金supported by the National Natural Science Foundation of China(Grant No.61170219)the Joint Research Foundation of the Ministry of Education of the People’s Republic of China and China Mobile(Grant No.MCM20150202)the Science and Technology Project Affiliated to Chongqing Education Commission(KJ1602201)
文摘How to energy-efficiently maintain the topology of wireless sensor networks(WSNs) is still a difficult problem because of their numerous nodes,highly dynamic nature,varied application scenarios and limited resources.An energy-efficient multi-mode clusters maintenance(M2CM) method is proposed based on localized and event-driven mechanism in this work,which is different from the conventional clusters maintenance model with always periodically re-clustered among the whole network style based on time-trigger for hierarchical WSNs.M2 CM can meet such demands of clusters maintenance as adaptive local maintenance for the damaged clusters according to its changes in time and space field.,the triggers of M2 CM include such events as nodes' residual energy being under the threshold,the load imbalance of cluster head,joining in or exiting from any cluster for new node or disable one,etc.Based on neighboring relationship of the damaged clusters,one can start a single cluster(inner-cluster) maintenance or clusters(inter-cluster) maintenance program to meet diverse demands in the topology management of hierarchical WSNs.The experiment results based on NS2 simulation show that the proposed method can significantly save energy used in maintaining a damaged network,effectively narrow down the influenced area of clusters maintenance,and increase transmitted data and prolong lifetime of network compared to the traditional schemes.
文摘Industries that suitable for cluster innovation are often intensive in knowledge and technology, with high capital agglomeration; closely interact and corporate with each other through resources sharing. Its development is depend on many factors, such as technical reliability, human resources, its own growth potential, competition, market prospects, and the government policies, etc.. Aimed at clarifying the path selection mechanism of cluster innovation, this paper first analyze the connotation of cluster innovation and its inside factors＇ bonding relationship, then exploring the triggers and path forming dimensions of cluster innovation. Finally, it builds a path-selection model on cluster innovation, and discusses the characteristics of each side.
基金National Natural Science Foundation of China(60577046) Cooperation Building Project of Beijing EducationCommittee(XK100130437)
文摘Polarization mode dispersion(PMD) is considered to be the ultimate limitation in high-speed optical fiber communication systems. Establishing an effective control algorithm for adaptive PMD compensation is a challenging task, because PMD possesses the time-varying and statistical properties. The particle swarm optimization(PSO) algorithm is introduced into self-adaptive PMD compensation as feedback control algorithm. The experiment results show that PSO-based control algorithm has some unique features of rapid convergence to the global optimum without being trapped in local sub-optima and good robustness to noise in the optical fiber transmission line that has never been achieved in PMD compensation before.
文摘Public service platform of industrial cluster includes Industry Association, Guarantee Agency, Productivity Center, R＆D Center, Inspection and Test Center, Training Institutions, Product Center and Professional Market, etc. By case study in Hubei province, local government and leading enterprises, they are the major part of public service platform constructing of industrial cluster.
文摘The Industrial Clusters show more competitive advantage in the world obviously since 1970＇s, which attracts extensive attention from all over the world. As the most important researches of the New Economic Geography, Poter＇s diamond model generalizes the internal mechanism of clusters, but the model has not given the microcosmic status of the factors of the clusters, therefore, it is significant to go deeper into the diamond model and the dissertation wishes to do some researches deeply.Based on the actuality of research, this paper surveys Porter＇s diamond model from the Evolutionary Economics, and combines the research of the field with the instance in China, then puts forward the diamond model of twin-screw and implements the model into traditional industrial clusters in Zheiiang province. Detailed explaining is as follows. The main innovations of the dissertation are as follows： （1） having taken the points of biology into economics, and developing the Evolutionary Economics creatively; （2） having proved the diamond model, put forward a twin-screw microcosmic model for the first time, and tried to study the dynamic and solid relationships of each factor in the diamond model, which is the most important innovation of the dissertation.
