Mutual information is an important information measure for feature subset. In this paper, a hashing mechanism is proposed to calculate the mutual information on the feature subset. Redundancy-synergy coefficient, a no...Mutual information is an important information measure for feature subset. In this paper, a hashing mechanism is proposed to calculate the mutual information on the feature subset. Redundancy-synergy coefficient, a novel redundancy and synergy measure of features to express the class feature, is defined by mutual information. The information maximization rule was applied to derive the heuristic feature subset selection method based on mutual information and redundancy-synergy coefficient. Our experiment results showed the good performance of the new feature selection method.展开更多
Recently, there have been many mo- bile value-added services in the Chinese mo- bile telecommunication market nowadays. Am- ong them, the characteristics of Multimedia Mes- saging Service （MMS） have not yet been ful...Recently, there have been many mo- bile value-added services in the Chinese mo- bile telecommunication market nowadays. Am- ong them, the characteristics of Multimedia Mes- saging Service （MMS） have not yet been fully understood. In this paper, with the help of a cloud computing platform, we investigated the flow-level charactefistcs of Chinese MMS. All of the experimental data were collected by the TMS equipment deployed in a major node in Sou- them China. The collection time spanned six mo- nths. We performed high-level analysis to show the basic distributions of MMS characteristics. Then, by analysing the detailed MMS features, we determined the distribution of personal MMS, and made a comprehensive comparison between 2G and 3G MMS. Finally, we tried to build a model on the personal MMS inter-arrival time, and we found that the Weibull distribution was optimum.展开更多
Performing surveys on a single section of a road is quite different from that on a road network. In the first case, the need for performance characteristics of the pavement may be of service to rehabilitation. Surveyi...Performing surveys on a single section of a road is quite different from that on a road network. In the first case, the need for performance characteristics of the pavement may be of service to rehabilitation. Surveying a road network, instead, aims to establish service levels, identify deficiencies and priorities and define budgets for maintenance. This challenge needs a methodological approach in order to widen the action plan and optimize the cost-benefit analysis of each asset through the use of preventive maintenance policies. High-speed monitoring systems on the market were specialized towards the necessity of measuring specific performance of the pavement or mapping land （data inventory）. The technological development of instrumentations such as inertial systems and synchronizers has enabled the integration of different devices and the achievement of the best correlation of data. This is the case of the LARAN （laser road analyzer）, whose helpfulness will be presented within a case study in which geometrical data and surface characteristic information-cracks, texture, profiles-were obtained through a unique survey. The cross-analysis resulted efficient for safety purposes and also for the identification of “black points” corresponding to boundary operative conditions of the road with respect to technical standards and recommendations.展开更多
基金Project supported by the National Natural Science Foundation ofChina (No. 60075007) and the National Basic Research Program(973) of China (No. G1998030401)
文摘Mutual information is an important information measure for feature subset. In this paper, a hashing mechanism is proposed to calculate the mutual information on the feature subset. Redundancy-synergy coefficient, a novel redundancy and synergy measure of features to express the class feature, is defined by mutual information. The information maximization rule was applied to derive the heuristic feature subset selection method based on mutual information and redundancy-synergy coefficient. Our experiment results showed the good performance of the new feature selection method.
基金supported in part by the National Science and Technology Major Project under Grant No.2012ZX03002008the National Natural Science Foundation of China under Grant No.61072061the National "111" Project of China’s Higher Education under Grant No.B08004
文摘Recently, there have been many mo- bile value-added services in the Chinese mo- bile telecommunication market nowadays. Am- ong them, the characteristics of Multimedia Mes- saging Service （MMS） have not yet been fully understood. In this paper, with the help of a cloud computing platform, we investigated the flow-level charactefistcs of Chinese MMS. All of the experimental data were collected by the TMS equipment deployed in a major node in Sou- them China. The collection time spanned six mo- nths. We performed high-level analysis to show the basic distributions of MMS characteristics. Then, by analysing the detailed MMS features, we determined the distribution of personal MMS, and made a comprehensive comparison between 2G and 3G MMS. Finally, we tried to build a model on the personal MMS inter-arrival time, and we found that the Weibull distribution was optimum.
文摘Performing surveys on a single section of a road is quite different from that on a road network. In the first case, the need for performance characteristics of the pavement may be of service to rehabilitation. Surveying a road network, instead, aims to establish service levels, identify deficiencies and priorities and define budgets for maintenance. This challenge needs a methodological approach in order to widen the action plan and optimize the cost-benefit analysis of each asset through the use of preventive maintenance policies. High-speed monitoring systems on the market were specialized towards the necessity of measuring specific performance of the pavement or mapping land （data inventory）. The technological development of instrumentations such as inertial systems and synchronizers has enabled the integration of different devices and the achievement of the best correlation of data. This is the case of the LARAN （laser road analyzer）, whose helpfulness will be presented within a case study in which geometrical data and surface characteristic information-cracks, texture, profiles-were obtained through a unique survey. The cross-analysis resulted efficient for safety purposes and also for the identification of “black points” corresponding to boundary operative conditions of the road with respect to technical standards and recommendations.
