Jumpei Tsutsumi

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We describe the architecture of the Japanese Virtual Observatory (JVO) prototype system version 2. JVO aims at seamless access to astronomical data archives stored in distributed data servers as well as data analysis environment. For this purpose, it is important to establish a framework for access to remote servers, including remote procedure calls (RPCs)(More)
This paper presents a performance evaluation of a class-E switched-mode power amplifier, designed in pHEMT GaAs technology, loaded by a high-isolation and low-Insertion Loss (IL) duplexer. This duplexer is based on Surface Acoustic Wave (SAW) technology. Measurements of the duplexer and layout of the class E PA are simulated under Agilent-ADS with a(More)
We have proposed the nonlinear elastic model for predicting the nonlinear responses of surface acoustic wave (SAW) duplexers, especially for the in-band 3rd order nonlinear distortion, the so-called `triple beat'. This paper validates the nonlinear elastic model by comparing the simulated triple beat responses to the measurements in several designs of SAW(More)
We present the design and implementation of the Japanese Virtual Observatory (JVO) system. JVO is a portal site to various kinds of astronomical resources distributed all over the world. We have developed five components for constructing the portal: (1) registry, (2) data service, (3) workflow system, (4) data analysis service (5) portal GUI. Registry(More)
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