Based on the characteristics of guaranteed handover （GH） algorithm, the finite capacity in one system makes the blocking probability （PB） of GH algorithm increase rapidly in the case of high traffic losd. So, when...Based on the characteristics of guaranteed handover （GH） algorithm, the finite capacity in one system makes the blocking probability （PB） of GH algorithm increase rapidly in the case of high traffic losd. So, when large amounts of multimedia services are transmitted via a single low earth orbit （LEO） satellite system, the PB of it is much higher. In order to solve the problem, a novel handover scheme defined by multi-tier optimal layer selection is proposed. The scheme sufficiently takes into account the characteristics of double-tier satellite network, which is constituted by LEO satellites combined with medium earth orbit （MEO） satellites, and the multimedia transmitted by such network, so it can augment this systematic capacity and effectively reduces the traffic loed in the LEO which performs GH algorithm. The detailed processes are also presented. The simulation and numerical results show that the approach integrated with GH algorithm achieves a significant improvement in the PB and practicality, as compared to the single LEO layer network.展开更多
Transformers are key components in substations,and their maintenance scheme is very important.Optimizing the transformer maintenance scheme can enhance substation reliability and lower maintenance cost.Current resolut...Transformers are key components in substations,and their maintenance scheme is very important.Optimizing the transformer maintenance scheme can enhance substation reliability and lower maintenance cost.Current resolutions focus on device state evaluation and fault detection,which is ex-post method.However,this paper proposes a LS-SVM algorithm based on deficiencies tree analysis to predict deficiencies in future under certain maintenance scheme,then choose the best maintenance scheme.展开更多
文摘Based on the characteristics of guaranteed handover （GH） algorithm, the finite capacity in one system makes the blocking probability （PB） of GH algorithm increase rapidly in the case of high traffic losd. So, when large amounts of multimedia services are transmitted via a single low earth orbit （LEO） satellite system, the PB of it is much higher. In order to solve the problem, a novel handover scheme defined by multi-tier optimal layer selection is proposed. The scheme sufficiently takes into account the characteristics of double-tier satellite network, which is constituted by LEO satellites combined with medium earth orbit （MEO） satellites, and the multimedia transmitted by such network, so it can augment this systematic capacity and effectively reduces the traffic loed in the LEO which performs GH algorithm. The detailed processes are also presented. The simulation and numerical results show that the approach integrated with GH algorithm achieves a significant improvement in the PB and practicality, as compared to the single LEO layer network.
文摘Transformers are key components in substations,and their maintenance scheme is very important.Optimizing the transformer maintenance scheme can enhance substation reliability and lower maintenance cost.Current resolutions focus on device state evaluation and fault detection,which is ex-post method.However,this paper proposes a LS-SVM algorithm based on deficiencies tree analysis to predict deficiencies in future under certain maintenance scheme,then choose the best maintenance scheme.
