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This paper presents current status and future direction of Photovoltaic (PV) electric power system installations in the world. This article also overviews PV R&D activities in Japan as the PV R&D Project Leader of NEDO and JST. Present status of various solar cells efficiencies under NEDO and JST PV R&D projects are presented: 44.4% for concentrator III-V compound 3-junction solar cell,...
Electrical properties of Hf-Zr-O films with several thicknesses are studied. Decent ferroelectric performances are obtained in a wide range of film thickness between 6.8 and 41 nm. A drawback in Hf-Zr-O system is that the operation electric filed for the saturated ferroelectric polarization is close to the breakdown electric field. An investigation of coercive field vs. thickness reveals that HfO2-based...
Blockchain is a distributed timestamp server technology introduced for realization of Bitcoin, a digital cash system. It has been attracting much attention especially in the areas of financial and legal applications. But such applications would fail if they are designed without knowledge of the fundamental differences in blockchain from existing technology. We show that blockchain is a probabilistic...
Coupled-resonant wireless power transfer (CR-WPT) technology is getting large interest for its capability of middle-range power transfer. However, for practical implementation, it is necessary to reduce near field leakage and far-field radiation. In this paper, EMC characteristics of CR-WPT antennas are investigated. As an antenna for CR-WPT, self-resonant antenna and capacitor-loaded inductor are...
We realized a system that provides manipulations of slide objects to enable users to give a reactive presentation. The ``reactive presentation'' means a presentation that can immediately react an unexpected context change. A presenter requires applying the presentation to the unexpected context such as the state of audiences, unexpected questions and audiences' knowledge. Attention controls by animations...
Far-field radiation from coupled-resonant wireless power transfer antenna is discussed. When using a switching power supply to improve power transmission efficiency, antenna input voltage includes many harmonics. Since coupled-resonant wireless power transfer antenna is an electrically small antenna for fundamental frequency, this antenna has high radiation efficiency for harmonics frequency. In this...
Microwave 3-dimensional reconstruction techniques exploiting multiple ISAR (Inverse Synthetic Aperture Radar) images have been well established, and are suitable for the recognition of artificial targets such as aircrafts or ships. However, the existing algorithms assume only an aggregation of multiple points, and most require the tracking of the multiple points over multiple ISAR images. In the case...
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