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This paper designs a P2P video-on-demand prototype system. A hybrid push-pull scheduling mechanism with random linear network coding in Galois field 2 and a weight function based caching strategy are adopted in the design. After careful and suitable segment and block division on video, random linear network coding in Galois field 2 is carried out on the blocks within a segment, and then the push-pull...
Distributed Web crawling (DWC) over DHTs is proposed to solve the bottlenecks in the traditional Web crawling. The core of this kind of system is its fully distributed task scheduling mechanism in which the crawlers are treated as peers and the crawlees are treated as resources maintained by the peers. A system model based on the content addressable network (CAN) can further optimize the scheduling...
Of the many peer-to-peer (P2P) systems in existence, BitTorrent is one of the most appealing that has managed to attract millions of users in the past few years. In this paper we present an extensive study of BitTorrent availability through measurement and analysis. Previous studies are limited to tracker without distributed hash tables (DHT), which have been used widely already. We first discuss...
Because of the complexity of topology and control strategy, the mid-voltage and large power frequency converter has more failure types and fault feature relatively. Then the correct identification and isolation of its internal faults are very important. Based on the MATLAB/Simulink, this paper established a complete fault simulation model of IGCT series mid-voltage & mid-power three level frequency...
As an unsupervised technique, clustering analysis has been widely applied in various fields. However, it is usually difficult to select an appropriate clustering method for an application, while no clustering method is suitable for all situations. This paper proposes a novel method to combine multiple clustering methods. First, the paper combines different agglomerative hierarchical methods in one...
Hilbert transformation is an ideal phase shifting tool in data signal processing. Being Hilbert transformed, the conjugated one of a signal is obtained. The Hilbert modulus is defined as the square of a signal and its conjugation. This work presents a method by which rotor faults of squirrel cage induction motors, such as broken rotor bars and eccentricity, can be diagnosed. The method is based on...
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