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Based on dual boundary element method, Forman modified model and back propagation neural network, a reliability simulation method for surface crack growth is presented. In consideration of the uncertainty of eight parameters such as initial crack depth, crack length, crack angle, material parameters, crack growth threshold, fracture toughness and fatigue load, the orthogonal design table L49 (7s)...
Support vector machine approach is an effective technique to solve poly-dimensional outlier detection, which can avoid the curse of dimensionality problem and has higher accuracy. One-class support vector machine-based outlier detection techniques take advantage of spatial and temporal correlations that exist between sensor data to cooperatively identify outliers. However, for large scale training...
In this paper, we build the model of the Cognitive Radio system by continuous time Markov chain and analyze the model by Markov theory. Aimed at the character that the access of over many cognitive users will result in the forced termination of the users' service, we design an algorithm to control access probability of the cognitive users. The algorithm maximizes system throughput in the precondition...
Cognitive Radio (CR) system can be combined with Non-Contiguous Orthogonal Frequency Division Multiplexing (NC-OFDM) technology to improve the spectrum utilization efficiency. In this paper, we introduce graph-coloring theory and max-min algorithm in multiuser OFDM system to CR NC-OFDM system for subcarrier allocation to gain the better system performance. We build a subcarrier allocation model based...
Of the vast amount of MV cables in the UK, the majority was installed in 1950psilas and 1960psilas. With a design life 60-70 years, age induced degradation and failure of the UK MV systems is becoming increasingly prominent in the minds of plant owners and operators. In this paper, the authors discuss the business case for on-line PD monitoring vs. off-line and compare on-line vs. off-line PD monitoring...
For many years identification of incipient Partial Discharge (PD) faults in power cables has been made through off-line investigation techniques. The periodic monitoring of power cables resulted in unexpected failures, with consequent financial penalties for the utilities. More recently, in an effort to allow continuous asset management of the medium voltage cable network to be carried out, on-line...
The most important indicator of the health of electrical plant items is the condition of their insulation for which partial discharge (PD) test or monitoring has been widely recognized as one of the best tools. The strategic importance of plant in the transmission network, and its high replacement and refurbishment cost, has categorized research and development aimed at PD based condition monitoring...
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