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Tag collision arbitration for passive RFID tags is a significant issue for fast tag identification. This letter presents a novel tag anti-collision scheme called Adaptive Binary Splitting (ABS). For reducing collisions, ABS assigns distinct timeslots to tags by using information obtained from the last identification process. Our performance evaluation shows(More)
Tag identification is an important tool in RFID systems with applications for monitoring and tracking. A RFID reader recognizes tags through communication over a shared wireless channel. When multiple tags transmit their IDs simultaneously, the tag-to-reader signals collide and this collision disturbs a reader's identification process. Therefore, tag(More)
Cooperative Communication (CC) is a technology that allows multiple nodes to simultaneously transmit the same data. It can save power and extend transmission coverage. However, prior research work on topology control considers CC only in the aspect of energy saving, not that of coverage extension. We identify the challenges in the development of a(More)
A radio frequency identification (RFID) reader recognizes objects through wireless communications with RFID tags. Tag collision arbitration for passive tags is a significant issue for fast tag identification due to communication over a shared wireless channel. This paper presents an adaptive memoryless protocol, which is an improvement on the query tree(More)
Mobile RFID, the technology of a cellular phone equipped with a RFID reader, allows users to read RFID tags anywhere. However, signals from more than two readers can interfere with one another, i.e., reader collision problem; reliable tag reading is necessary. This paper proposes Gentle protocol to use beacon messages and multi-channel for increasing(More)
† This work was funded by SK Telecom under Contract Number KU-R0405721 to Korea University. ‡ Correspondent Author Abstract— In the RFID system, a reader recognizes tags through communication over a shared wireless channel. When more than one tag transmits their IDs at the same time, the tag-to-reader signals lead to collide and collision disturbs the(More)
In this paper, we investigate the positive influence dominating set (PIDS) which has applications in social networks. We prove that PIDS is APX-hard and propose a greedy algorithm with an approximation ratio of H(δ) where H is the harmonic function and δ is the maximum vertex degree of the graph representing a social network. © 2009 Elsevier B.V. All rights(More)
Peripheral expressions using various modalities are considered as possible alternative ways of delivering information in our communication. In this research, we aimed to explore how the thermal expression can be used in the interpersonal communication. Based on the result of the focus group interview, we developed a pair of devices with which the users can(More)