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Oilfield development plan is an important issue to energy exploitation. In addition to the deterministic and stochastic models brought forward in the past studies, this paper proposes a multi-objective programming model for oilfield development plan, in which parameters are fuzzy variables. In order to solve this model, we use AHP to weigh objective functions and design a hybrid intelligent algorithm...
The three-level PWM rectifier topology has been studied in this paper, and the decoupled state-space equations in synchronous rotating reference frame (d-q frame) were derived. The hierarchical controller structure is adopted, namely, the inner current-loop is responsible for reference current tracking and the outer voltage-loop is responsible for load regulation. The design methodologies for proportional-integral...
Online gaming has become a popular leisure-time activity in resent years. In this study, we adopted the push-pull-mooring model, which analyzes human migration behavior based on the demographic migration theory, to explain why players switch from an existing game to a new one. An empirical survey was conducted to collect data from 574 online gamers and then this data was analyzed using the structural...
In this paper, a 1/4 turns quadrifilar helix antenna is designed and analyzed by NAKANO equation with MOM. Radiation pattern is given as well as the current distribution on one arm. 3dB beam is wider than 180deg, which proves that the radiation character of the antenna is satisfactory. Then the working condition of the antenna is studied by attaching it to a satellite model. It is seen that after...
The conventional passive filtering has been outdated since it detune with age and the performance of passive filters is affected by the grid impedance, which may cause resonance problems. Active power filters (APFs) are attractive solutions to solve harmonics-related power quality problems due to the development of power semiconductors, control theory and digital signal processors (DSP), and they...
In the paper, the mapping relation between static characteristics of electro-hydraulic servo valve and fault pattern is analyzed. The method of multi-parameter fault pattern recognition of electro-hydraulic servo valve based on BP neural networks is introduced, which is researched based on tests. The result shows that the accuracy rate of fault pattern recognition is higher by adopting this method...
Due to the sub-wavelength lithography, manufacturing sub-90 nm feature sizes require intensive use of resolution-enhancement techniques, among which optical proximity correction (OPC) is the most popular technique in industry. Considering the OPC effects during routing can significantly alleviate the cost of post-layout OPC operations. In this paper, we present an efficient, accurate, and economical...
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