My research interests and passion has been on designing, building and analyzing networked systems, applications and services based on wireless technologies including radio information identification (RFID), Wi-Fi and Global System for Mobile communications (GSM) / Enhanced Data rates for GSM Evolution (EDGE) / Third Generation of mobile phone standards and technology (3G). In the past fives years, I have studied and worked at the Microprocessor R&D Center (MPRC) of Peking University, China; Bell Labs Research China (BLRC); China Mobile Communications Corporation Guangdong (GMCC) and the RFID Labs of IST, Penn State. The research topics I have been interested in and involved include Voice over IP (VoIP), peer-to-peer (P2P) systems, Session Initiation Protocol (SIP) / IP Multimedia Subsystem (IMS), mobile softswitch, RFID information systems/networks, wireless positioning technology (RFID/Wi-Fi positioning technology, Mobile-positioning system), location-based services and mobile video services.
My
current research focuses on wireless location tracking system and
services, RFID technology, pervasive computing, and location-based
services (LBS). In the last September, I started my research work at
the RFID lab of IST. The first research topic is centered on
RFID-enabled location tracking system . We designed a location-based
communication system, which integrates RFID, wireless 802.11 and other
pervasive technologies into existing communication systems by adopting
SIP as the main control protocol. We used a four-layer model to
describe the system architecture. Besides, since most RFID tags and
readers have limited capabilities in data computing and SIP
communications, we introduced a location-oriented RFID middleware to
solve the resource constraint problem. To realize the location
information services, we analyzed the ontology entities in the system
and designed semantic integration rules for the location engine. The
whole system employs the SIP event notification model to support the
PUSH and PULL operations needed by most LBS.I am currently working on an access control model for pervasive systems especially RFID information systems. We investigate the data characteristics of these systems and tackle challenges of access authorization from five aspects: item-level and product-level, aggregation and disaggregation, containment relationship, sub-concept and union, and attribute authorizations. For each challenge, we design a solution based on dynamic authorization rules. Besides, how to integrate the model into existing systems is also being considered.
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