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With the research and application of monopulse antenna, Sum and Difference become an essential element. As the basic component, the magic-T should be paid attention to. Due to the drawback of large profile in traditional magic-T, one planar magic-T structure working at the Ka-band have been designed and simulated in this letter. The E-arm fed through a longitudinal coupling gap in the proposed structure...
This letter introduces a Sum and Difference Network working at the centre frequency of 35.5GHz of Ka-Band. The Monopulse radar needs to be fed with the Sum and Difference Network for its requirement for sum and difference signals. Due to the requirement for sum and difference signals, the Monopulse radar was added to be fed with the Sum and Difference Network In this paper, the proposed structure...
We present MaWi — a smart phone based scalable indoor localization system. Central to MaWi is a novel framework combining two self-contained but complementary localization techniques: Wi-Fi and Ambient Magnetic Field. Combining the two techniques, MaWi not only achieves a high localization accuracy, but also effectively reduces human labor in building fingerprint databases: to avoid war-driving, MaWi...
Accurate localization is crucial for wireless ad-hoc and sensor networks. Among the localization schemes, component-based approaches specialize in localization performance. By grouping nodes into increasingly large rigid components, component-based localization algorithms can properly conquer network sparseness and anchor sparseness. However, such design is sensitive to measurement errors. Existing...
In consideration of feature and requirement of equipment maintenance support servicemen training, the matter element comprehensive evaluation model was established based on extension theory, in order to overcome the subjectivity and relevance between indicators in traditional evaluation method, rough set theory was introduced to the evaluation of equipment maintenance support training effect. the...
In normal Voronoi diagram, each site is able to see all points in the plane. In this paper, we study the problem such that each site is only able to see half-plane and construct the so-called Half-plane Voronoi Diagram (HPVD). We show that the half-plane Voronoi cell of each site is not necessary convex and it could consist of many disjoint regions. We prove that the complexity of the HPVD of n sites...
With the rapid development of internet and the network applications' increasing popular in each field of universities, web application security issue becomes one of the main factors that constraint the development of the internet. Access control is an important part of security service. It integrates closely with identity authentication, encryption and other factors. This paper expatiate the design...
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