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Gas leakage is one of the most frequent types of accidents in the petrochemical industry. It is imperative to use mobile sensors to monitor such an accident area. The new and effective way is to use drones and helicopters that spray wireless sensors from the air to monitor harmful gases and to locate the gas leaking source. However, the sprayed wireless sensors will be distributed randomly around...
Curing induced residual stress of epoxy-alumina composites influences properties of large scale epoxy casting products like Ultra High Voltage(UHV) GIS spacer. It will result in defects like cracks and voids which will worsen electric field distribution and degrade insulation characteristics of spacers, then endanger the safety and stability of power system during long-time operation. According to...
Failure of one or multiple critical nodes may partition wireless sensor networks into disjoint segments, and thus brings negative effect on the applications. We propose DCRS, a Distributed Connectivity Restoration Strategy to tolerate the failure of one critical node. Because of the energy restriction of sensor nodes, the energy overhead of the recovery process should be minimized to extend the lifetime...
This paper introduces a portable ECG monitor with USB host Interface. This system uses Microprocessor C8051F021 as its controlling core, and SL811HS as USB host Interface chip. Based on this hardware, the paper presents USB host specification stack, specification frame about USB Mass Storage and FAT file system so that the collected ECG signals can be stored in U-Disk without delay. In addition, the...
ETL is an important process in building data warehouse. For processing large volume of data and accessing to heterogeneous multi-data sources, how to efficiently shorten the execution time and possess the ability of general accessing data sources is a big challenge. Aiming at the special requirements of telecommunication decision support system, this paper proposes a solution of a general ETL management...
We develop and test a logistic regression model to examine how companies choose between public offering and private placements in China. Three findings emerge. First, profitability is one of the most important factors that influence on the choices of SEO. Companies that cannot make enough profits without qualifications for public offering are more likely to choose private placement. This evidence...
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