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In this paper, we propose a novel RFID reader/writer architecture that dynamically retargets various protocols of RFID by changing configuration software. The proposed architecture is not software defined radio, but parameterized hardware that is specialized in RFID protocols. This architecture consumes lower power than that of software defined radio, because the proposed architecture does not require...
This paper proposes an instruction set processor which uses hierarchical block-floating-point (H-BFP) arithmetic. H-BFP has been developed to provide efficient development approach for digital signal processing system. H-BFP offers highly abstracted computation model, and leads to cost-effective implementation. However, application development based on H-BFP is still time consuming task because of...
Synchronized optical code division multiplexing system using 128-chip orthogonal sequence SSFBG en/decoder was experimentally demonstrated. Multiplexing for more than 17 users is experimentally demonstrated with changing interference levels using orthogonal codes for reducing cross-correlation noise.
We propose a high-accuracy, low-cost UWB-IR wireless location system based on the quasi TDOA method. The system consists of anchor nodes, a synch node and a location server. The anchor nodes synchronize each other as regulated by the synch node so that synchronization is always precise in the location process. To make the anchor node simple, the location system uses acquisition and tracking functions...
We report a precise MEMS gyroscope with a 'ladder structure', which was designed to reduce acceleration sensitivity, temperature dependence of sensitivity, and offset drift. This gyroscope has four masses linked by two parallel straight beams, and each mass oscillates in opposite directions in a driving mode. A sensor module using the fabricated gyroscope shows low acceleration sensitivity and stable...
We aimed to develop the aquatic propulsion mechanisms of Paramecium like and fish like robots that consist of real-time variable stiffness fins. For the aquatic propulsion mechanisms of the Paramecium like robot, we have used fins with ICPF (Ionic Conducting Polymer gel Film) actuator to change its stiffness for representing ciliary movement. For the aquatic propulsion mechanisms of the fish like...
For deep-sub micron technology based LSIs, conventional stuck-at fault model is no longer sufficient for fault test and diagnosis. This paper presents a method of fault diagnosis for transistor shorts in combinational and full-scan circuits under logic test environment. Description of a short requires a very large number of physical parameters, and hence it is difficult, if not impossible, to describe...
This paper reports the output degradation reduction when spot dirt adheres to a small photovoltaic module with rectangular cells. A small photovoltaic module of 13 W was applied to various electric systems. The module consisted of single crystal silicon photovoltaic cells. The effect of the output degradation was studied by changing the aspect ratio of the photovoltaic cell. It was also studied the...
The function optimization is one of the most important optimization problems. In approaches to function optimization by evolutionary computation, a real-coded genetic algorithm, UNDX+MGG, shows good performance on multimodal functions with epistasis among parameters. However, UNDX+MGG has a problem that its performance is good on functions with big valley structures but deteriorates on those with...
There are several important roles for the electron cyclotron resonance heating (ECRH) methods in helical-type plasma experimental devices. One is to produce high-temperature and high-density current-free plasmas. Another is additional heating of electrons and resulting ion heating through equipartition. Plasma temperature and current profile controls with highly localized heating become advanced techniques...
Spark conditioning procedure is widely used to improve the hold-off performance of vacuum gaps, but there are still unknown points for the mechanism of spark conditioning. Previous studies showed that both anode and cathode surfaces were cleaned by the conditioning and the cathode surface was covered with melted layer caused by the arc occurrence. In addition the field electron emission from the conditioned...
Most studies on a flashover event in vacuum has revealed that the surface charging on insulator has a great influence on the flashover. However, regarding most studies related to the surface charging, their measurements were carried out after high voltage excitation. In this research, the measurement of 2D surface charge distributions in real time has been carried out in vacuum by Pockels effect....
Secondary electron emission (SEE) coefficients of alumina ceramics with three different surface finishes have been measured using a scanning electron microscope with a single-pulse electron beam (100 pA, 1 ms). SEE coefficients of those aluminas with annealing process became lower after mechanical grinding operations even though its average roughness was almost same as those of as-sintered ones. SEE...
To clarify the mechanism of surface flashover in vacuum, it is necessary to investigate time dependence of surface charging from voltage application to flashover event. In this research, the real time measurement of 2D surface charge distributions has been carried out in vacuum using a Pockels device. Commercial AC high voltage was applied to some kinds of organic films through a needle electrode...
Gases desorption from an electrode by electron irradiation are regarded as one of causes leading to vacuum breakdown. Desorbed gases stimulated by several-keV electrons from oxygen-free copper were analyzed by using a quadrupole mass spectrometer (QMS). In order to measure gases desorbed from the sample electrode with QMS directionally, a cooling shroud was surrounded with the QMS. The cooled shroud...
Surface breakdown of solid insulator in vacuum is initiated by surface charging which is strongly influenced by electron emission properties of the insulator. In this study, photoelectron emission of alumina exited by vacuum ultraviolet light is observed using an electron emission microscope (EEM). As a result, photoelectron emissions of 99.7% purity alumina ceramic named HA997, sapphire (single crystal...
The breakdown phenomena in the 500 keV electrostatic accelerator with large FRP insulators for the fusion application was examined without the beam acceleration. When the high voltage was applied, the light emission with a broad peak at a wavelength of 420 nm was mostly emitted inside the accelerator even though breakdown did not occur. It was found that the voltage holding capability has a strong...
The aim of this study is to demonstrate the relationship between the user's walking speed and the data transmission speed in an indoor guidance system using fluorescent lights and a wireless LAN. A simulation formula is used to give out the direct relationship between the parameters. We simulated four angles (30deg-90deg) between the sensor and the horizontal direction. Three different walking speeds...
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