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An innovative mechanism of a file-backup system concept is proposed. In the proposed file backup mechanism, the combination of the following technologies such as a spatial random scrambling of file data, a subsequent random fragmentation of the file, the corresponding encryption and duplication for each fragmented one by using a stream cipher code in each encryption stage, and the corresponding notification...
For this study, we developed a contactless loading sensor system that can measure the internal loading of an object structure through several covering materials for the purpose of structural health monitoring. The developed system can be inserted into objects without a battery because the system consists of passive RFID for data communication and a power supply. The system uses little electric power...
Recently, system designers, especially in the field of product life-cycle management system start considering use of user memory bank of UHF RFID tags. By storing most useful life-cycle data onto a tag, user can access to the data even without access to back-end databases. One of the major issues to make use of the user memory bank is detection of memory tampering. Although technology vendors start...
In ubiquitous computing, localization of an radio frequency identification (RFID) tag attracts great attention, since it is a key to interfaces with location awareness such as haptic interfaces and navigations for blind people/mobile robots. Since an RFID tag with carrier frequencies of 135kHz or 13.56MHz has a loop antenna, the tag's position estimation is reduced to localization of a magnetic dipole...
This paper presents a simple algorithm and a compact sensor for localization of a magnetic dipole. First, we derive an explicit localization formula, where the dipole position, irrespective of its posture, is directly reconstructed from the magnetic field and its spatial gradient tensor. Then, we develop a sensor unit consisting of three orthogonal loop coils, three orthogonal planar gradiometers,...
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