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The possibility of building horizontally polarized, electronically steerable antenna by using active frequency selective surface is investigated. A 10-element electronically steerable antenna is realized by using an omni-directional Alford-loop antenna and active frequency selective surface columns with horizontal polarization sensitive direction. This antenna working at 2.4 GHz WiFi band is 360-degree...
We are developing radar technology to inspect the inner structure of wooden buildings suffered from strong quake by earthquake. GB-SAR (Ground Based Synthetic Aperture Radar) for inspection of wooden and concrete walls and structures has been developed and the system was evaluated by test measurements. The GB-SAR system uses frequency bandwidth 1–20GHz, and it can acquire full polarimetric radar signal...
Bi-connectivity is a basic requirement for designing fault tolerant topologies in wireless networks. In cognitive radio networks (CRNs), available channels of cognitive users dynamically change since a channel becomes unavailable whenever the channel is reclaimed by primary users. Therefore, fault tolerance of CRNs highly depends on the status of channel availability. However, traditional definition...
In the process of institutional transforming pattern and affected by the system constraints and traditional concept, there still exists a big problem in providing the electronic service capacity and level by the local governments in west China. The construction of government portal website in particular is difficult to satisfy the growing demands of the masses of the people. Through the performance-based...
Service composition is becoming a prevalent way to building service-oriented business applications (SOBAs). In an open service environment, the profit of composition (PoC) is a primary concern of building such applications. How to improve the PoC is a significant issue in developing SOBAs but was largely overlooked by current research. Particularly, the modeling and prediction of PoC should play a...
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