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Taiwan is a mountainous and geologically active country with but land resource for residential development is limited. Under a crowded population pressure, the use of land resources is often overrun. Many hillside had been improperly developed. It causes significant impact on natural environment and the people's lives and property. This paper proposed to use the archival images of the Formosat-II...
Due to the advantages of low switching loss and high efficiency, LLC resonant converters have been widely used. Based on the extended describing function concept, the small-signal model of an LLC resonant converter is derived in this paper. The equivalent circuit of small-signal model is illustrated so that the corresponding frequency response can be easily obtained by using Is Spice simulation. The...
Spectrum sensing is important for dynamic spectrum allocation in cognitive radio networks (CRNs). Spectrum sensing algorithms are used to determine the frequency of spectrum sensing and the order for the channels to be scanned. In this paper, we propose a two-phase and two-period spectrum sensing (TTSS) scheme using high-layer information for CRNs. Benefiting from advanced physical-layer technologies,...
This paper describes the design, tests and preliminary results of a triple-plane sensor detecting the X-ray pulsars vectors to acquire the spacecraft attitude. Comparing to normal attitude measurement, the triple-plane sensor has made an adversary and new effort by inventing a triple-plane structure, with the orthogonal vectors pointing towards the different directions. By measuring the power received...
Snow depth (SD) is an important input parameter for snow cover hydrologic model and climate model. In China, the snow volume is affected by the plateau climate and different geographical situation, which shows specific rules and characteristics in space and time distribution. Consequently, it is very necessary to dynamically estimate the snow volume of China area. In this paper, we use passive microwave...
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