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A nonlinear equivalent magnetic network (EMN) model is proposed for a linear permanent magnet vernier (LPMV) machine. The meshing method is employed to solve the problem of the modeling of complex flux paths in stator teeth tips. Especially, an end-region model based on the electromagnetic principle is developed to consider the longitudinal end effect of the LPMV machine. The key contribution of this...
It is urgent for modern society to save energy and protect environment. But the efficiency of traditional lighting equipment which occupies a rather high proportion of total electric load is very low. Now, they are more and more instead by power electronics based devices, such as energy-saving lamps or LED lamps. For the different characteristics from that of traditional devices, the new kind of lighting...
In order to realize load current imbalance measuring for paralleling IGBT devices, the authors propose a novel method for measuring the imbalances from IGBT gate charge. In the study, an analytical model between gate charge and on-state current has been worked out to find the current differences of IGBT among each paralleled sub-circuits. The results from simulation show that the analytical model...
In the era of big data, Hive has quickly gained popularity for its superior capability to manage and analyze very large datasets, both structured and unstructured, residing in distributed storage systems. However, great opportunity comes with great challenges: Hive query performance is impacted by many factors which makes capacity planning and tuning for Hive cluster extremely difficult. These factors...
Different risk constraint represents the different decision-making process of decision-makers. This paper use the traditional Mean-Variance, Value at Risk and Conditional Value at Risk which are from financial engineering to establish the optimum order risk decision model under the assumption of normal distribution. In order to illustrate the characteristics of different risk measurement constraint,...
In this paper, we compare the costs and efficiency arising from the delta-neutral dynamic hedging of options, using two possible values for the delta of the option. The first one is the traditional Black-Scholes delta, while the second one is the GARCH option pricing delta, namely the delta of the option in the generalized Black-Scholes model with a volatility calibrated from GARCH model. Both our...
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