In the view of traditional industry cluster theory, it is easy to copy the software industry cluster pattern, or it is easy to copy another Silicon Valley, due to low reliability of the resources and the guidance fact...In the view of traditional industry cluster theory, it is easy to copy the software industry cluster pattern, or it is easy to copy another Silicon Valley, due to low reliability of the resources and the guidance factors of locations in software industry. But it is much more difficult to copy a Silicon Valley mode practically than imaginatively and the difficulties of bringing up and supporting high-tech initiatives is more than theoretic anticipation. In China, the software companies have just gathered together geographically and therefore no initiative center can be formed. All these above signify that software industry cluster is distinct from the traditional industry clusters, but the cognition of the reasons of software industry cluster is not clear yet. Furthermore, reasonable explanations of the bewilderment in the economical practice of software industry cluster are urgently needed.展开更多
A hierarchical clustered BitTorrent （CBT） system is proposed to improve the file sharing perior-mance of the BitTorrent system, in which peers are grouped into clusters in a large-scale BitTorrent-hke underlying ove...A hierarchical clustered BitTorrent （CBT） system is proposed to improve the file sharing perior-mance of the BitTorrent system, in which peers are grouped into clusters in a large-scale BitTorrent-hke underlying overlay network in such a way that clusters are evenly distributed and that the peers within the cluster are relatively close to each other. A fluid model is developed to compare the performance of the proposed CBT system with the BitTorrent system, and the result shows that the CBT system can effectively improve the performance of the system. Simulation results also demonstrate that the CBT system improves the system scalabihty and efficiency while retaining the robustness and incentives of the original BitTorrent paradigm.展开更多
A number of clustering algorithms were used to analyze many databases in the field of image clustering. The main objective of this research work was to perform a comparative analysis of the two of the existing partiti...A number of clustering algorithms were used to analyze many databases in the field of image clustering. The main objective of this research work was to perform a comparative analysis of the two of the existing partitions based clustering algorithms and a hybrid clustering algorithm. The results verification done by using classification algorithms via its accuracy. The perfor-mance of clustering and classification algorithms were carried out in this work based on the tumor identification, cluster quality and other parameters like run time and volume complexity. Some of the well known classification algorithms were used to find the accuracy of produced results of the clustering algorithms. The performance of the clustering algorithms proved mean-ingful in many domains, particularly k-Means, FCM. In addition, the proposed multifarious clustering technique has revealed their efficiency in terms of performance in predicting tumor affected regions in mammogram images. The color images are converted in to gray scale images and then it is processed. Finally, it is identified the best method for the analysis of finding tumor in breast images. This research would be immensely useful to physicians and radiologist to identify cancer affected area in the breast.展开更多
The cube is the only regular hexahedron among the Platonic solids,but supramolecules with a cubic configuration have rarely been reported.Herein,two isostructural metal–organic cubes VMOC-6 and VMOC-7 with large cavi...The cube is the only regular hexahedron among the Platonic solids,but supramolecules with a cubic configuration have rarely been reported.Herein,two isostructural metal–organic cubes VMOC-6 and VMOC-7 with large cavities are successfully synthesized by face-directed self-assembly of concave hexanuclear vanadium clusters[V_(6)O_(6)(OCH_(3))_(9)(XO_(4))(COO)_(3)]^(n−)(X=S,n=2;X=V,n=1)and large-size nitrogen-containing tetravalent ligands.VMOC-6 and VMOC-7 are the largest metal–organic cubes based on metal clusters with an outer diameter of 28.47×28.17×28.44Å^(3) and an inner cavity volume of 7785.657Å^(3).Moreover,the cages can capture volatile iodine vapor with an uptake value of up to 1.83 g g^(−1),which is superior to those of most metal–organic materials.Mechanistic studies have shown that their good adsorption capacity is closely related to the presence of large internal cavities,electron-donating pyridine groups and redox-active V sites.The present work shows the potential application of these mesoporous MOPs in the treatment of iodine-containing nuclear waste.展开更多
It was supposed that, the nucleus was composed of α-cluster, pn-pair, and nn-pair. The reciprocity of the α-cluster, pn-pair, and nn-pair caused the regular change of the separating energy to separate the nn-pair in...It was supposed that, the nucleus was composed of α-cluster, pn-pair, and nn-pair. The reciprocity of the α-cluster, pn-pair, and nn-pair caused the regular change of the separating energy to separate the nn-pair in the exotic nuclei. The regular change was that the separating energy was high behind low to separate the nn-pair in the light and exotic nuclei. This phenomenon must had more profound physical meaning.展开更多
文摘In the view of traditional industry cluster theory, it is easy to copy the software industry cluster pattern, or it is easy to copy another Silicon Valley, due to low reliability of the resources and the guidance factors of locations in software industry. But it is much more difficult to copy a Silicon Valley mode practically than imaginatively and the difficulties of bringing up and supporting high-tech initiatives is more than theoretic anticipation. In China, the software companies have just gathered together geographically and therefore no initiative center can be formed. All these above signify that software industry cluster is distinct from the traditional industry clusters, but the cognition of the reasons of software industry cluster is not clear yet. Furthermore, reasonable explanations of the bewilderment in the economical practice of software industry cluster are urgently needed.
基金the National High Technology Research and Development Programme of China(No2004AA104280,2006AA01Z172)
文摘A hierarchical clustered BitTorrent （CBT） system is proposed to improve the file sharing perior-mance of the BitTorrent system, in which peers are grouped into clusters in a large-scale BitTorrent-hke underlying overlay network in such a way that clusters are evenly distributed and that the peers within the cluster are relatively close to each other. A fluid model is developed to compare the performance of the proposed CBT system with the BitTorrent system, and the result shows that the CBT system can effectively improve the performance of the system. Simulation results also demonstrate that the CBT system improves the system scalabihty and efficiency while retaining the robustness and incentives of the original BitTorrent paradigm.
文摘A number of clustering algorithms were used to analyze many databases in the field of image clustering. The main objective of this research work was to perform a comparative analysis of the two of the existing partitions based clustering algorithms and a hybrid clustering algorithm. The results verification done by using classification algorithms via its accuracy. The perfor-mance of clustering and classification algorithms were carried out in this work based on the tumor identification, cluster quality and other parameters like run time and volume complexity. Some of the well known classification algorithms were used to find the accuracy of produced results of the clustering algorithms. The performance of the clustering algorithms proved mean-ingful in many domains, particularly k-Means, FCM. In addition, the proposed multifarious clustering technique has revealed their efficiency in terms of performance in predicting tumor affected regions in mammogram images. The color images are converted in to gray scale images and then it is processed. Finally, it is identified the best method for the analysis of finding tumor in breast images. This research would be immensely useful to physicians and radiologist to identify cancer affected area in the breast.
基金financially supported by the NSFC of China(No.22271023,22175033).
文摘The cube is the only regular hexahedron among the Platonic solids,but supramolecules with a cubic configuration have rarely been reported.Herein,two isostructural metal–organic cubes VMOC-6 and VMOC-7 with large cavities are successfully synthesized by face-directed self-assembly of concave hexanuclear vanadium clusters[V_(6)O_(6)(OCH_(3))_(9)(XO_(4))(COO)_(3)]^(n−)(X=S,n=2;X=V,n=1)and large-size nitrogen-containing tetravalent ligands.VMOC-6 and VMOC-7 are the largest metal–organic cubes based on metal clusters with an outer diameter of 28.47×28.17×28.44Å^(3) and an inner cavity volume of 7785.657Å^(3).Moreover,the cages can capture volatile iodine vapor with an uptake value of up to 1.83 g g^(−1),which is superior to those of most metal–organic materials.Mechanistic studies have shown that their good adsorption capacity is closely related to the presence of large internal cavities,electron-donating pyridine groups and redox-active V sites.The present work shows the potential application of these mesoporous MOPs in the treatment of iodine-containing nuclear waste.
文摘It was supposed that, the nucleus was composed of α-cluster, pn-pair, and nn-pair. The reciprocity of the α-cluster, pn-pair, and nn-pair caused the regular change of the separating energy to separate the nn-pair in the exotic nuclei. The regular change was that the separating energy was high behind low to separate the nn-pair in the light and exotic nuclei. This phenomenon must had more profound physical meaning.
