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Saturable transformer and magnetic switch are the core components to realize the function of all-solid-state nanosecond pulse power supply. In order to further explore the effect of core materials on the performance of power supply and improve the compactness of power supply by optimizing the size of magnetic components, this paper analyzes the working state of the magnetic elements at each stage...
In this work, we propose an acoustic planar magnifying hyperlens. The lens consists of the parallel-arranged channels with periodically varied cross-sections. The overall hyperbolic dispersion behavior makes the lens capable of converting near-field evanescent waves to fat-field propagating waves. Simulation results verify the super-resolution magnifying imaging of the proposed hyperlens.
Satellite networks can provide global coverage and broadband access to end users, thus enabling human communication worldwide. In satellite communication networks, routing is the key issue encountered by support services. Therefore, a novel Quality of Service (QoS) routing method (QRM) is proposed and evaluated in this study based on the characteristics of the low Earth orbiting satellite rosette...
With the rapid development of wireless sensor networks, satellite sensor networks (SSNs) and high-resolution SSNs (HRSSNs) have been proposed and demonstrated to have significant advantages over general networks. SSNs and HRSSNs have been applied in many fields, including national defense, military, national security, environmental monitoring, and traffic management. In addition, high-resolution satellites...
Finding the appropriate number of clusters to which documents should be partitioned is crucial in document clustering. In this paper, we propose a novel approach, namely DPMFP, to discover the latent cluster structure based on the DPM model without requiring the number of clusters as input. Document features are automatically partitioned into two groups, in particular, discriminative words and nondiscriminative...
This paper presents a IPM based SRD system, which achieves some advantages: such as safety reliability and simple design. It focus on the analysis of varies operation modes of single IPM based SRD system, studying the intention of design process in detail: including freewheeling procession, transferring, and operating states of clockwise and anticlockwise rotation condition, it offers reference for...
Eco-efficiency is an instrument for environment assessment that indicating how efficient the economic activity performs toward to its environment impacts. This paper conducts an eco-efficiency analysis for city industrial systems in Heilongjiang province by using the DEA method proposed by Kuosmanen and Kortelainen. Using the data of 14 cities and areas in Heilongjiang province from 2005∼2009, an...
Resisting spam in tagging system is very challenging. This paper presents DSpam, a novel spam-resistant tagging system which can significantly diminish spam in tag search results with users' reliabilities. DSpam client groups other users into unfamiliar users and interacted users according to the fact whether the client has interacted with such users. For an unfamiliar user, the client computes his...
One of the most important reasons for poor performance on the basic education ICT projects is due to the lack of a systemic framework, which is used to identify the essential factors and their relationships during the project, the systemic framework is important especially for those cross-sector projects, such as the projects of ICT tests in Shanghai rural schools. Maturity Model frameworks were created...
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