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Currently, most of the existing web cache replacement strategies are based on temporal locality, frequency distribution and size distribution while spatial locality gets less attention. This paper proposed a reference model to evaluate the spatial locality of web object accessing, and used the reference model as the basis of a new cache replacement strategy -- GDSR, Greedy-Dual-Size Reference. GDSR...
Planning of the mobile robot is one of the core research areas which is complex, binding and non-linear. Ant colony algorithm is an intelligent optimization algorithm developed in recent years. Aiming at the problems of the ant colony algorithm such as slow convergence speed and long computation cycle, in order to improve the efficiency of route planning, proposed using improved ant colony algorithm...
In parallel converters applications, direct parallel topology was respected because of the advantages of small size, low cost, simple structure and easy to extend. However, the coupling effects maybe exist because the parallel converters are connected by non-isolated mode. In this paper the average model was proposed in the rotating coordinate system. As the entire system is a symmetric structure,...
In this paper, modeling of parallel three-phase converters is first presented. Then definition of the circulating currents of paralleled converters and the circulating-current-generating mechanism are clearly explained. Thus, based on this definition, an averaged model of the circulating current is proposed. It is seen from this model that the circulating current consists of mainly the zero-sequence...
A novel phasor control scheme is developed for a SMES system to protect a critical load from momentary voltage sags. This system consists of a 0.3 MJ superconducting magnet, a 200 kVA IGBT-based current source converter and a 2.5 mH reactor inserted between power supply and load. To obtain a rapid response, the current vector PWM strategy is applied. Simulations and experiments are carried out to...
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