Teruki Sukenari

A rule-based RFID tag system using ubiquitous chips

Because of the recent development of radio frequency identification (RFID) technologies, various systems for RFID tags have been proposed. Since RFID tags only have a simple function, i.e., sending data, they can be available for various purposes. Accordingly, by customizing RFID tag systems, we can expand their applications. However, previous systems have been usually proposed for one special purpose only. In this paper, we propose a rule-based RFID tag system using ubiquitous chips. Our previously proposed ubiquitous chips are rule-based I/O control devices. By applying rule-based principles, we can easily customize the RFID tag system and can construct flexible, scalable, and easy exploitable systems.

A Wireless Dual-Link System for Sensor Network Applications

A reduced-power-consumption wireless ad-hoc multi-hop network system, the dual-link system,is been developed, using the following two technologies: Dual-link communication, which handles two different frequency bands, achieves low-power data transmission through independent optimum settings of both operation periods and communication distances for each band. The selection of frequency bands and operation settings depends on both the data sizes and communication intervals defined for individual applications. This dual-link communication is applicable to various kinds of intermittent communications. A vine-tree network topology that offers low addressing-bit counts and results in low packet-error rates even in low transmission-power communications. Since the topology does not require a routing table for individual nodes, hardware complexity can be kept to a minimum.