For the sake of clarity, we reproduce here some definitions in overlay terminology:Graceful and ungraceful leaving: A graceful peer departure from the overlay implies a notification to the overlay in which the peer transfers its routing and resource information. In an ungraceful departure (i.e., due to link failure), the registered information on the lost peer stays in the overlay.Parallelism (��): the number of parallel messages that a peer can send to other peers to accelerate operations.Replication (r): the number of peers responsible for each contact or resource information.System-wide number (k): the number of entries in each list or bucket of peers composing the DHT.The rest of this paper is organized as follows. Section 2 describes the background. Section 3 discusses related work.
Section 4 presents our proposal for adaptive network updates. Sections 5 and 6 evaluate the proposal by means of analysis techniques and simulations, respectively. Finally, section 7 concludes the paper.2.?Background2.1. SIP and Sensor Information ExchangeSIP was originally designed for VoIP and instant messaging applications. However, it is currently being used in applications beyond its original purpose, such as sensor information exchange. For example, SIP has been proposed as a protocol for metering information exchange in the Smart Grid [19,20], intelligent transport and mobility systems [21�C23] and mobile service provision [24]. All these services rely on information provided by senso
With the development of the power industry, gas-insulated switchgear (GIS) has become more widely used in the power grid for its advantages of high reliability, small volume, and simple maintenance.
Sulfur hexafluoride (SF6) is used in GIS for its good insulating performance and arc extinction properties [1�C4]. The manufacture, transportation and installation process inevitably result in defects in GIS equipment. These defects include metal burrs, protrusions, or Dacomitinib suspended particles. In long-term operation, these latent defects could cause partial discharge (PD). SF6 may undergo a decomposition reaction when it reacts with water and oxygen to produce a series of compounds, such as HF, SO2, H2S, SO2F2, and SOF2[5,6]. These products will accelerate insulation aging and corrode metal surfaces, finally resulting in GIS faults [4].
As important SF6 decomposition characteristic component gases, the detection of variations in the concentrations of SO2 and H2S is significant to determine the insulation level of SF6 gas and the development conditions of PD. Moreover, such detection lays a solid foundation for further diagnosis and assessment of GIS equipment operating status.Carbon nanotubes (CNTs) have a rich pore structure, large specific surface area, and good adsorption and desorption properties.