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This paper presents an efficient method to measure physical parameters of thin elastic layers by using an air-coupled ultrasound technique. In the method, surface densities of elastic thin layers are approximated through solely non-contact measurement of through-transmission of ultrasonic signals. A copper foil and a copper foil coated with carbon composite on both sides are used to experimentally...
Determining physical parameters of thin elastic multi-layers are essential in the field of scientific research and engineering applications. Routine matrix formulations for multilayered media are very complex and involve intensive computation. At the same time, conventional ultrasonic measurements need coupling agents, which greatly limit practical applications. The objective of this research is to...
Small cells are beneficial for both users and operators to improve communication quality. The femtocell is one type of small cell used for indoor coverage. Enterprise femtocell installation inevitably produces intralayer and interlayer interference management issues. Enterprise femtocell optimization and indoor propagation modeling are built in this work based on the communications environment characteristics...
Device-to-Device (D2D) communication technology has emerged as an interesting and important area nowadays. In D2D system, Synchronization is a key technology which can ensure effective discovery. There has been extensive research on synchronization method in the context of ad hoc networks during the last few years. However, few of them seems suitable for the D2D communication since they perform badly...
Device-to-Device (D2D) Communication is an innovative mobile network technology, which is one of the key technologies in LTE-Advanced system. D2D communication can realize cellular users directly connect to transfer data under the eNodeB's control. This technology brings higher system capacity and mitigates the eNodeB's load. In order to evaluate the performance of this new technology, D2D communication...
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