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In this paper, a high-precision digital phase-shifting and attenuating module for satellite phased array antenna is introduced. With hybrid integration of the beam lead PIN diodes, the RT/Duroid 5880 laminates, the packaged driving devices, the module achieves high-precision phase-shifting and attenuating characteristics, small insertion loss, high linearity and good flatness of amplitude and phase,...
The fast retrieval in archival traffic data is essential for network security and forensic analysis. A bitmap index is a data structure enabling fast search over large data collections in a limited time, but the space consumption is always a problem. WAH, PLWAH and COMPAX are proposed for compressing bitmap indexes for less storage. In this paper, a new bitmap index encoding scheme, named MASC, is...
Smoothed $\boldsymbol{\ell_0} $ norm (SL0) is a fast and complex domain extendible sparse recovery algorithm which is suitable for many practical real-time applications. In this letter, we propose an improved algorithm termed “Thresholded Smoothed $\boldsymbol{\ell_0} $ Norm (T-SL0) ” for accelerating the iterative process of SL0. T-SL0 introduces an iterative efficiency indicator and compares it...
The emerging field of ubiquitous electronics has placed new requirements and challenges on the design and fabrication of RF systems. Graphene electronics, with its extremely flexible surface and excellent transport properties, has the potential to play a key role in such applications, especially for building analog IC on highly flexible and transparent substrates. This paper discusses our recent progress...
To evaluate the ambient air quality status of the Fuxin city in Aug-Nov, 2011, we established fuzzy comprehensive evaluation mathematical model and membership function using lower semi-trapezoid distribution through the distribution of data collection and selecting the main factor affecting air quality, and have the result that urban monthly average air quality has declined with the temperature during...
The spatio-temporal behavior of people is of significant importance for a variety of social and economic applications. The wide use of mobile phone provides a new way to obtain the space and time information of citizens by means of the positioning mechanism of cellular network. In the conceptual framework of time geography, this kind of data could be used for generalize a space-time path of human...
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