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This paper introduces a dual-band dual-mode button antenna for body centric communications. Integrated on the clothes, the proposed antenna has a miniaturized flexible ground. By employing PIFA and its higher order mode, an omnidirectional pattern and a broad-side directional pattern for on-body and off-body communications are realized at lower and upper bands, respectively. With a flexible ground,...
Wireless sensor networks deployment and operation are most likely to take place under hazardous conditions. One extreme scenario is the deployment of a wireless sensor network in a mountainous and forested region in which a fire has ignited, for the purpose of localizing and /or tracking, in real time, its spread. Some methods developed in this paper are expected to provide superior performances under...
Always-on localization is an important problem for a lot of context sensitive mobile computing applications. This paper proposes WaveLoc, which effectively uses measurements from a trajectory as its fingerprint for localization. Different from traditional approaches, which use signatures from single-points for localization, we leverage signatures from a trajectory, since it offers a lot more information...
Metro amount of ground during excavation and tunnel crown settlement and the amount of physical and mechanical properties of overburden, overburden thickness, and the excavation of the upper surface of the shape of the load, and many other factors. In this paper, the monitoring of land subsidence subway, on the subway excavation of ground observation data analysis, the results show that the surface...
This article presents a watermarking algorithm based on one-dimensional (1-D) chaotic map in wavelet transform (WT) domain. Traditional encryption and watermarking technologies in the WT domain are combined in this algorithm. First, the watermark is encoded by a chaotic sequence, which is generated by a key. On the basis of human visual system (HVS), it is then divided into two parts and embedded...
Digital watermarking plays an important role in image verification and copyright protection. A watermarking scheme for authenticating ROI (region of interest) of image has been proposed in the paper. To embed the watermark in the interior of ROI, Poisson matting technique is introduced to extract the region of interest of image. The color foreground obtained by Poisson matting is converted to the...
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