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In order to evaluate the insulation condition of gas insulated switchgear (GIS) by using the ultra-high frequency (UHF) method, attempt to estimate PD current using the finite difference time domain (FDTD) method was carried out. The influence of PD current parameters and the position of measuring point on the received electromagnetic (EM) waves was studied. The EM waves received by using UHF sensors...
In tracking, one of the major challenges comes from handling appearance variations caused by changes in scale, pose, illumination and occlusion. In this paper, we propose a novel Bayesian Hierarchical Appearance Model (BHAM) for robust object tracking. Our idea is to model the appearance of a target as a combination of multiple appearance models, each covering the target appearance changes under a...
A series of cross section data of electron interactions with SF6 has been used to calculate the positive point corona streamer in SF6 by using CMP. The calculated external current during single discharge ion has been divided into three stages of development to reveal the formation and propagation of streamer through the relationships of time and position of detailed electron and ion densities and...
This paper examines a new method on static tension measurement of overhead transmission line based on vibration spectrum analysis. Firstly, the causes of vibration of overhead transmission line are discussed. And then, static and dynamic characteristics of conductors are analyzed, and with reasonable simplification, taught string model is brought in to describe the relationships between static tension...
To reduce the level of noise of the transmission line, JL/G1A-500/35DZ low noise conductor is designed in this paper. Its structural parameters, such as protrudent height, protrudent angle and other parameters, are optimized by wind tunnel test and electric test. The preforming and synchronized tightening module device is designed. JL/G1A-500/35DZ low noise conductor is produced by this device, which...
This paper presents a hidden Markov model (HMM) based prognosis method for prediction of equipment health. HMM allows modeling the time duration of the hidden states and therefore is capable of prognosis. The estimated state duration probability distributions can be used to predict the remaining useful life of the systems. The previous HMM based prognosis algorithm assumed that the transition probabilities...
QFD is a customer-oriented approach to product innovation. The weight of customer requirements and engineering measures are important. The mathematical models are critical tools to get the weight. Both the models of other scholars and the writer are introduced in detail. A comprehensive analysis of the models is done. At last, conclusion and prospect are given.
In this paper, a genetic accelerated trust region algorithm without constraints presented, which can deviate saddle point, and quickly reach more excellent point by using probabilistic optimization approach. While trust region algorithm can only converge to partial optimum, the new algorithm can converge to global optimum with an example proved the validity.
In semi-supervised clustering, domain knowledge can be converted to constraints and used to guide the clustering. In this paper we propose a feature selection algorithm for semi-supervised clustering. In our method, features are conditionally independent. Feature saliency is first computed in unsupervised clustering using the expectation maximization model. Then, it is refined in the tuning step to...
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