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Satellite communication networks have advantages of global coverage and inherent broadcast capability, and offer a solution for providing broadband access to end-users. The regular mesh topologies, typical for satellite networks, comprise of Inter-Satellite Links(ISLs). But due to dynamic changing of traffic load and inter-plane ISL distance variation, adaptive routing is an absolute requirement for...
Recently, due to the low accuracy of GPS in indoor environment, many indoor positioning techniques have been researched to provide location-based service for visitors in public buildings such as museums, galleries, etc. But many indoor positioning techniques cannot distinguish human's moving patterns and external infrastructures are needed to improve accuracy. In this paper, a Fuzzy Pedestrian Dead...
Non-geostationary (NGEO) satellite networks have a series of advantages over terrestrial networks. However, traditional routing algorithms such as the Dijkstra's Shortest Path (DSP) algorithm always lead to some Inter-Satellite Links (ISLs) heavily loaded. To guarantee a better distribution of traffic among satellites, this paper proposes a Fuzzy Satellite Congestion Indicator (FSCI) to estimate congestion...
The mesh topology structure constituted by inter- satellite links(ISLs) along with longitude and latitude, as a feature of most LEO satellite constellations, has not been fully used. Additionally, most LEO networks design its routing protocol depending on path distance, which is only proportional to the propagation delay without consideration of the queue delay. In this paper, a low-complexity routing...
As we all know, the accuracy of GPS become worse indoors due to the satellite signal attenuation. However, people spend most of his or her time in the indoor environment and the location-based service is needed in the indoor environment. Hence, many indoor positioning techniques have been researched to provide location-based service for visitors in public buildings such as museums, galleries, etc...
Country risk is a quite important factor for international investment. Many institutions and researchers try to assess country risk by using numerous indicators and various evaluation models. This paper investigates the dynamic behavior of country risk in order to offer more detailed information of country risk to investors. First, country beta is taken as the proxy of country risk. Second, dynamic...
Considering the characteristics of infrared images contaminated by Gaussian noise, impulse noise and other mixed noises, an adaptive hybrid filtering algorithm based on infrared image's local statistical property is presented in this paper. It can automatically detect noises, determine the output based on threshhold value, select the size of filtering window, and judge the image edge on the basis...
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