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Accurate and real-time traffic flow prediction is important in Intelligent Transportation System (ITS), especially for traffic control. Existing models such as ARMA, ARIMA are mainly linear models and cannot describe the stochastic and nonlinear nature of traffic flow. In recent years, deep-learning-based methods have been applied as novel alternatives for traffic flow prediction. However, which kind...
The records generated by taxicabs which are equipped with GPS devices is of vital importance for studying human mobility behavior, however we are focusing on taxi drivers' operation patterns in this paper. We identify a group of valuable characteristics, which are simple but effective, through large scale drivers' behavior in a complex metropolis environment. Based on the daily operations of 31,000...
Ground segmentation is an important pre-processing task for local environment perception using 3D LIDAR, and it is particularly challenging in unstructured environments with rough or sloped terrain. To solve the ground segmentation problem we propose a novel cost-based ground measurement model that is incorporated into a Markov Random Field and solved using loopy belief propagation. Our cost-based...
With the rapid development of social media, User Generated Content (UGC) has spawned huge amount of information in the society today. In the age of Big Data, we can provide important information for peoples' transportation needs through exploring and making full use of traffic data in social media. This paper introduces techniques like Natural Language Processing, cloud and open platform, mobile Internet,...
The steer by wire (SBW) system use electric wires to transmit angle of steering wheel between steering wheel and front wheel. The influence factors of ideal transmission ratio in SBW system were studied in this paper. Ideal transmission ratio model of SBW system was established by applying fuzzy control theory and this model has relation with vehicle speed and steering angle of steering wheel in the...
The electronic chart symbol library is the important component of electronic chart display and expression. The point symbols, line symbols and fill patterns of the electronic chart symbol library are a kind of map language which is used to mark the ocean geographic elements and navigation signals, and they are the major expression of the chart. Currently GIS is not compatible with the electronic chart,...
Based on international standards for Electric Navigational Chart in a wide variety of standard materials, such as fairways, navigation lines, beacons, buoys, wrecks, and so on, up to 180 species, and different object has different standard display. Display symbols of some objects can be determined according to category attribute or shape attribute, but some other have to be determined based on the...
Now,the most output of maps in China must conform to national specifications, however the famous GIS platform, ArcGIS, cannot meet these requirements from Chinese users. Consequently, on the basis of seriously comparing the national specifications with the cartographic symbols provided by ArcGIS, this paper offered the design and development of the scales and slope scales based on ArcEngine development...
Addressing the characteristics that the ArcGIS has relatively weak support to China's standard drawing of basic scale map form, and is unable to generate marking information automatically and repeatedly use the same decoration elements, this article adopts the Element under ArcEngine components to implement the map decoration with1:50 000 plotting scale. The system can draw out the decoration contents...
In this paper, for improving the integrative controlling effect of Trichoderma harzianum, effect of 14 pesticides on T. harzianum was studied with growth rate method and the circle of inhibiting bacterium method. The results suggested that all 14 tested pesticides with different concentration showed different controlling effect on mycelia growth of T. harzianum. At the recommended concentration in...
Based on the 27 domestic listed companies which took place mergers and acquisitions during 2003 to 2005 and published as the top 5 on the Web site of the Global M & A Research Center, the performance of M & A was analyzed by factor analysis and paired-samples T test. The research found that: In the financial indicator system to impact of M & A performance, the solvency, profitability and...
Based on whether the Chinese and the U.S. interest rates and exchange rate agreeing with covered interest rate parity theory or not, Granger causality test and co-integration test were utilized to analyze Chinese and the U.S. interest rates and exchange rate from the perspectives of the relation and the transmission mechanism of them. The research found that, without regard to institution and economic...
The rapid increasing of similar Web services in the Internet, as well as enhancements of requirements for quality of service (QoS) by users, had created great challenges for Web service composition. We propose an optimized method for Web service composition on the basis of semantic Web. Web service is described by fuzzy Horn clause, and a QoS-oriented Web service composition model is built by fuzzy...
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