With the demand of real-time and dynamic scalability processing for multi-source mass data in transportation, this paper proposed a distributed in-memory database experimental platform based on GemFire. The platform used the attributes of GemFire, such as key-value data storage structure and distributed dynamic membership. The actual data from floating car system was used to complete the performance analysis in cloud computing architecture. The experimental results show that the platform can shorten the calculation time of mass data to less than 10% of the existing system and basically satisfy the application requirements of transport data resources integration in cloud computing platform.

In view of the lower accuracy of traditional tax forecasting models, the authors put forward a method of combining the Adaboost algorithm with BP neural network to forecast revenue. Firstly, the method performed the pretreatment for the historical tax data and initialized the distribution weights of test data; secondly, it initialized the weights and thresholds of BP neural network, and used BP neural network as a weak predictor to train the tax data repeatedly and adjust the weights; finally, it made more weak predictors of BP neural network to form new strong predictors by Adaboost algorithm and forecasted. The authors also carried out simulation experiment for the tax data of China from 1990 to 2010. The results show that this method has reduced the relative value of mean error from 0.50% to 0.18% compared to the traditional BP network, has effectively reduced the effect when single BP gets trapped in local minima, and has improved the prediction accuracy of network.

This paper focused on the environmental characteristics of High-Speed Railway (HSR) and its influence on 3rd Generation (3G) mobile communication networks. Firstly, the technical characteristics of three major 3G communication standards in China were analyzed, especially the two key issues in the construction of HSR communication system: wireless coverage and fast handoff. Then the body loss of serials of HSR, the minimum switching area and the optimization deployment strategies of 3G communication technologies in China were summarized. Lastly, the tendency of HSR's wireless communication technologies was prospected and it was found that the Long Term Evolution (LTE) technologies could provide the technical feasibility for the broadband application services of HSR. Hence, it is suggested that we should strengthen the research for wireless transmission performance optimization of TD-LTE in HSR environment.

The multi-hop transmission of multimedia emergency communication system based on Wireless Mesh Network (WMN) in underground mine have two problems: low basis bandwidth and high multi-hop transmission attenuation. This paper aimed to improve the multi-hop transmission performance for the system. In this paper, a trunk line network structure of multimedia emergency communication system based on WMN in under-ground mine was proposed. The authors established its transmission model, and then had a research on the main factors that affected the transmission performance. The multi-radio node structure of multi-hop mesh backbone network based on 802.11n was proposed and solved the two problems of multi-hop transmission. The experimental results show that it has more than 165Mbps basis bandwidth, and under the limited 60Mbps environment, the bandwidth attenuation of per hop is less than 1%, basically satisfying the application requirements of multimedia transmission in underground mine.