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Wireless sensor networks enjoy some unique characteristics. For example, sensor network are often autonomous, long-lived and rely on battery as the power source. In this paper, we thus improve the SOS kernel to address these unique characteristics. Firstly, we design and implement the hot-swapping capability in SOS that allows a module to be upgraded on the(More)
Recently, management of uncertain data draws lots of attention to consider the granularity of devices and noises in collection and delivery of data. Previous works directly model and handle uncertain data to find the required results. However, when data uncertainty is not small or limited, users are not able to obtain useful insights and thereby tend to(More)
Macroscopically, a polymer-stabilized blue phase liquid crystal (BPLC) is assumed to be an optically isotropic medium. Our experiment challenges this assumption. Our results indicate that the optical rotatory power (ORP) of some nano-scale double-twist cylinders in a BPLC composite causes the polarization axis of the transmitted light to rotate a small(More)
In recent years, online social networks have been dramatically expanded. Active users spend hours communicating with each other via these networks such that an enormous amount of data is created every second. The tremendous amount of newly created information costs users much time to discover interesting messages from their online social feeds. The problem(More)
Hydrological data are often missing due to natural disasters, improper operation, limited equipment life, and other factors, which limit hydrological analysis. Therefore, missing data recovery is an essential process in hydrology. This paper investigates the accuracy of artificial neural networks (ANN) in estimating missing flow records. The purpose is to(More)
Although communications policy has important repercussions, its direct and indirect effects are rarely considered when crucial decisions are made. In part, this is due to the increasingly diverse environment of the information and communication industries. It is also partly due to the limitations of the traditional static framework for policy analysis in(More)