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In recent years, the PM2.5 (particulate matter with a mean aerodynamic diameter of 2.5 micrometers or less) pollution has become a very serious problem in China. Currently, there are three types of monitoring approaches: government-led monitoring, Wireless Sensor Networks (WSN) approaches and Participatory Urban Sensing (PUS). There are three limitations in these state-of-the-art research approaches:...
This paper proposes a virtual resource (VR) allocation scheme for OFDMA based wireless virtualization networks (WVNs). The scheme considers the time-variant wireless channel quality from the technical perspective, as well as the network benefits for WVN elements, e.g., subscriber user equipments (SUEs), mobile network operators (MNOs) and wireless service providers (WSPs), from the economic perspective...
Collaborative beamforming has been widely used in wireless sensor networks to improve the directivity of signals in long-distance transmission. The performance of collaborative beamforming has been well analyzed for the case without phase offset in the literature. However, there always exists the phase ambiguity caused by carrier phase jitter between the transmitter and receiver nodes in a practical...
In order to overcome the premature, enhance the searching ability, improve the convergence speed, this paper propose a catastrophic real-coded chaotic quantum-inspired genetic algorithm (CRCQGA), in multimodal function test, this algorithm is the test result is good; and the algorithm is applied to many to one transmission mode of WSN (Wireless Sensor Network) TDMA (Time Division Multiple Access)...
The purpose of this paper is to represent a wind powered wireless sensor network system and introduce a novel transmission power control scheme based on remaining energy level and energy harvesting status to extend the lifetime of WSNs. Energy constraint has always been one of the most significant problems of wireless sensor networks along with the development. Many methods have been introduced to...
In most mobile-assisted localization schemes, mobile anchors follow predefined or random trajectories to send beacon messages around. Although working well in regular and uniform networks, predefined or random trajectories lead to wasted efforts in irregular and non-uniform deployment. We propose a novel scheme of trajectory design by utilizing the topology information of the network. Based on rigidity...
Air conditioners possess a large proportion of the energy consumption in a building for both heating and cooling functions. The purpose of this paper is to present the work in progress which uses simple and cheap sensor nodes mounting on the external unit of air conditioners to automatically sense the usage pattern. This work is part of the project called Cyber IVY, which provides means of building...
Most of the current reputation models for wireless sensor networks (WSNs) do not consider seriously the vulnerabilities of reputation models themselves, which makes them easily manipulated by traitor attacks. The traitors can launch attacks against reputation models on both service level and recommendation level. Until now, recommendation traitor attack has received little attention, although it causes...
Wireless sensor networks(WSNs) have been increasingly available for large-scale applications in which energy efficiency is an important performance measure. These applications include environmental monitoring and structure monitoring which demand multifarious data. Driven by the energy limitation nature of WSNs lots of research works have been done in aspects such as nodes deployment, routing protocol,...
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