Tiancheng Zhang

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The spatial and temporal variations and sources of polychlorinated biphenyls (PCBs) in sediment of tidal flat from Haizhou Bay, China were investigated. PCBs concentrations in surface sediments ranged from 1.33 to 6.27ngg(-1) dry weight. Low-chlorinated PCBs, dominated by the tri-PCB homologs, were identified as the prevalent contaminate of surface(More)
Correlation analysis is a basic problem in the field of data stream mining. Typical approaches add sliding window to data streams to get the recent results, but the window length defined by users is always fixed which is not suitable for the changing stream environment. We propose a Boolean representation based data-adaptive method for correlation analysis(More)
Radio Frequency Identification (RFID) has been playing more and more important roles in domains such as supply chain management, commodity retail and health custody. RFID data can support functions such as object location, object tracking and trajectory analysis. However, at some point, to deploy many RFID devices into a real application scenario would be(More)
As an information of combining RFID and wireless data communication technologies, Internet of Things is making things all over the world connected. RFID (Radio Frequency Identification) technology is the most basic key technology in Internet of Things, which combines signal processing, wireless communication, embedded calculation and data management. RFID(More)
Event prediction in event stream is an important problem in temporal data mining. However, existing event prediction algorithms are based on string prediction in which a character represents an event or an event type, do not take into account event sequence semantic and can not predict for infrequent event sequences. In this paper, an event prediction(More)
Radio Frequency Identification (RFID) poses multiple advantages over traditional barcodes, such as hands-off detection, longer read range and more data storage. In addition, the declining cost of RFID systems along with improved sensitivity and durability nowadays has increased its usage potential in a variety of domains such as logistical, planning and(More)
The advent of conference mobile call demands the security communication between end users. However, currently there is no efficient secure end-to-end protocol exists for conference mobile call. This slows down the steps of conference communication. In this paper a secure end-to-end protocol for remote conference is designed base on previous experts work,(More)