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Real-time urban traffic information estimation with a limited number of surveillance cameras

Frontiers of Computer Science 2012年第5期6卷 547-559页

作者： Guangtao XUE Ke ZHANG Qi HE Hongzi ZHU Department of Computer Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China baidu corporation Shanghai 201203China

Constant traffic congestion consumes enormous amounts of energy and causes vastly increased journey times. Therefore, real-time traffic information is of great importance to the public because such information is invaluable to more efficient traffic control and travel planning. To obtain such information in metropolises like Shanghai, however, is very challenging due to the extraordinarily large scale and com- plexity of the underlying road network. In this paper, we pro- pose a novel traffic estimation scheme utilizing surveillance cameras pervasively deployed in cities. With only a limited number of roads with cameras, we adopt a measurement- based traffic matrix （TM） estimation method to infer the traf- fic conditions on those roads with no cameras. Extensively trace-driven simulations as well as field study results show that our scheme can achieve high accuracy with a very limited number of measurements. The accuracy of our measurement- based algorithm outperforms the traditional speed-based and model-based approaches by up to 50%.

关键词： real-time traffic information surveillance cameras measurement-based traffic matrix estimation topologypruning

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Research on Traceability of Cold Chain Logistics Based on RFID and EPC

Research on Traceability of Cold Chain Logistics Based on RF...

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作者： Lishuan Hu Caihong Xiang Chengming Qi College of Urban Rail Transit and Logistics Beijing Union University TAIJI Computer corporation Limited

In recent years,people placed great emphasis on food quality and *** half million people die of food hygiene problems every year in the *** to effectively trace the source of various kinds of food with various origins has become the core issue of food safety *** on EPC,RFID and baidu Map API,this paper designs a tracking and traceability platform and establishes a food life cycle model to ensure food safety and improve service *** main research contents include:developing EPC coding system of the research object;solving the life cycle of the research object.

关键词： Agricultural products Cold chain Traceability EPC RFID

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Research of E-map System Based on baidu Map API for University Campus

Research of E-map System Based on Baidu Map API for Universi...

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作者： Yingjian Cai Lishuan Hu Caihong Xiang College of Urban Rail Transit and Logistics Beijing Union University TAIJI Computer corporation Limited

With the rapid growing of universities,the campus infrastructure continues to *** are not clear the position of their *** online mapping service updating not timely can only supports customers to browse and query incomplete description of the *** this paper,a spatial information inquiry system of campus is designed based on baidu map API with JavaEE *** system can provide the basic map function for almost all important things on *** on this method,Beijing Union University campus E-map has been developed successfully,which demonstrates the feasibility of this solution.

关键词： E-map spatial information campus navigation baidu Map API

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