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It is important task to discover communities or hidden groups by analyzing the messages collected in social networks. For the case when some members of a community are known, a proper method is still necessary to infer the remaining community members. To address such an issue, we develop a closeness centrality examination algorithm to obtain the remaining(More)
The underwater scattering channel for line-of-sight (LOS) underwater optical wireless communications in the transmission window (wavelength of 400nm-600nm) is modeled by a ray tracing technique. The inherent seawater optical properties, the scattering and absorption of the suspending particles, are represented by one single parameter-chlorophyll(More)
The characteristics of the non-line-of-sight (NLOS) scattering channel for underwater optical wireless communication in the optical transmission window (wavelength of 400nm-600nm) are studied. The channel is modeled by the Monte-Carlo ray tracing technique. The impulse response and path loss at different wavelengths in variable water conditions are analyzed(More)
It has been demonstrated that the dual-wire waveguide (DWW) can be used in terahertz (THz) frequency regime with many advantages. However, the existent research approaches for the DWW are based on the electrostatic theory. In this paper, making use of the bipolar coordinate system (BCS), a rigorous analytical theory of DWW is worked out, and some important(More)
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