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Without the applicable methods of forecasting the outbreak of debris flows in a wide area as well as long time, wireless sensor networks (WSN) of monitoring debris flow are essential for protecting safety and property of human. In nowadays, a common and key consideration of the network would be the energy efficiency, since both of the soil moisture (SM) sensor and the radio are power-hungry, meanwhile,...
E-healthcare systems of Wireless Body Area Network (WBAN) promise enormous change in future healthcare industry. The system generally consists of multiple sensor nodes that monitor various medical signals and deliver data to a network coordinator for further processing. One of the major issues of such systems is energy efficiency, owing to the limited power supply and difficult replacement of batteries...
In this article we proposed an improved Super-SBM model dealing with undesirable outputs under the weak disposability assumption of undesirable outputs. Energy efficiencies of various industrial sectors in China from 2001 to 2010 are measured based on this model, and the influencing factors for energy efficiency are explored by Tobit regression model. Empirical results show that, during “The Eleventh...
The existing 3D topology control methods can not be applied to initial disconnected network topology and do not consider connectivity extension. Although extending Coop. Bridges scheme to 3D space can solve it, the induced network topology is not energy efficient. In this paper, we propose the Connectivity-enhanæd Interference-aware Energy-efficient Topology Control (CIETC) for 3D cooperative ad hoc...
Cooperative technology is deemed to be one of the promising solutions for the next-generation wireless communications. By virtue of the space time coding and diversity combination, an enhanced cooperative relay (ECoR) scheme is designed for the uplink of wireless cellular network, where two users are served by two relay nodes and one base station in a cooperative way. The objective function of the...
The design of distributed algorithms and techniques allowing for an efficient utilisation of infrastructure in terms of energy consumption is one of the key challenges in heterogeneous networks or HetNets. In this study the energy efficiency in the HetNet scenario is formulated as an optimisation problem and an iterative improvement algorithmic approach to power on-off of network cells is devised...
The effect of relaying in terms of energy efficiency is an important and interesting issue in cellular communications. In this paper, two relaying schemes for uplink are analyzed and compared in the context of cellular systems: Simple relaying (SR), where a user is served either by a relay node or the base station, and Cooperative Relaying (CR), where a user is served by the relay node, the base station...
In this paper two schemes of distributed antenna selection, Pathloss-based Antenna Selection (P-AS) and Energy-efficient Antenna Selection (E-AS), are studied for the purpose of improving energy efficiency in Distributed Antenna Systems (DAS). Path loss information is exploited in P-AS, whilst the energy consumption of antenna nodes is taken into account in E-AS for the Pre-coding Matrix Index (PMI)...
This paper puts forward and discusses the prospects of carbon based nanomaterials (including carbon nanotubes and graphene nano-ribbons) for designing next generation low-power, low-loss and ultra energy-efficient “green” electronics targeted for computing as well as energy storage and conversion applications.
Energy-efficient node placement is one of the main design issues for linear structure wireless sensor networks. Two types of node placement schemes studied in the paper are to maximize the network lifetime and to balance the network reload. For a given number of nodes, study the optimal spacing; for a given node spacing, study the optimal density of nodes. Simulation shows, two types of node placement...
Emergency data which mean something happened in sudden need to be dealt with timely, otherwise will bring very serious consequences. To ensure the low-delay routing of emergency data, a novel graded routing strategy, dynamic adaptive cooperative routing (DACR) is proposed in this paper. This scheme extends the LEACH protocol to enable the multi-hop transmissions among clusters by incorporating a cooperative...
The optimal number of cluster heads is an important parameter of wireless sensor network performance. Network nodes will consume more energy if the number of cluster heads is too much or too little. This paper focuses on novel calculation method for optimal number of cluster heads. Base on the analysis of LEACH energy dissipation model, novel calculation method is derived from the total energy dissipation...
In order to improve energy efficiency and balance network load in wireless sensor network, an uneven virtual grid-based clustering routing protocol (VGCR) is proposed. VGCR divides network region into different rings through the base station-assisted positioning. According to optimal number of cluster heads, the rings are divided into grids furthermore. Cluster heads election and cluster formation...
UWB technology advances the lifetime of UWB-based wireless sensor networks (WSNs) and clustering enhances utilization of limited energy resources of the network.Since cluster heads (CHs) usually forward data via multi-hop, energy consumed by each CH vary with relay traffic and its member size. To achieve energy balance, an overall energy efficient clustering (OEEC) algorithm is proposed. It elects...
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