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1. A Novel Data Schema Integration Framework for the Human-Centric Services in Smart City
Ding Xia, Da Cui, Jiangtao Wang, Yasha Wang
ZTE Communications    2015, 13 (4): 25-33.   DOI: 10.3969/j.issn.1673-5188.2015.04.004
摘要86)      PDF (433KB)(74)    收藏
Human-centric service is an important domain in smart city and includes rich applications that help residents with shopping, dining, transportation, entertainment, and other daily activities. These applications have generated a massive amount of hierarchical data with different schemas. In order to manage and analyze the city-wide and cross-application data in a unified way, data schema integration is necessary. However, data from human-centric services has some distinct characteristics, such as lack of support for semantic matching, large number of schemas, and incompleteness of schema element labels. These make the schema integration difficult using existing approaches. We propose a novel framework for the data schema integration of the human-centric services in smart city. The framework uses both schema metadata and instance data to do schema matching, and introduces human intervention based on a similarity entropy criteria to balance precision and efficiency. Moreover, the framework works in an incremental manner to reduce computation workload. We conduct an experiment with real-world dataset collected from multiple estate sale application systems. The results show that our approach can produce high-quality mediated schema with relatively less human interventions compared to the baseline method.
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2. Design of a Silicon-Based High-Speed Plasmonic Modulator
Mu Xu, Jiayang Wu, Tao Wang, and Yikai Su
ZTE Communications    2012, 10 (1): 34-39.  
摘要66)      PDF (494KB)(82)    收藏
In this paper, we propose a silicon-based high-speed plasmonic modulator. The modulator has a double-layer structure with a 16 μm long metal-dielectric-metal plasmonic waveguide at the upper layer and two silicon single-mode waveguides at the bottom layer. The upper-layer plasmonic waveguide acts as a phase shifter and has a dielectric slot that is 30 nm wide. Two taper structures that have gradually varied widths are introduced at the bottom layer to convert the photonic mode into plasmonic-slot mode with improved coupling efficiency. For a modulator with two 1 μm-long mode couplers, simulation shows that there is an insertion loss of less than 11 dB and a half-wave voltage of 3.65 V. The modulation bandwidth of the proposed modulator can be more than 100 GHz without the carrier effect being a limiting factor in silicon. The fabrication process is also discussed, and the proposed design is shown to be feasible with a hybrid of CMOS and polymer technology.
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