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Advanced Persistent Threat (APT) imposes increasing threats on cyber security with the developing network attack technologies. APT is a highly interactive, specifically targeted and extremely harmful network-centric attack, which employs various technologies to evade detection during attacks leading to the result that victims will not be aware of attacks until they suffer from tremendous losses. Since...
Grid harmonic interactions among multiple Flyback micro-inverters have been studied. The method of small-signal modeling and time-domain analysis based on transformer current equation are adopted to obtain the Norton model of Flyback micro-inverters with current feedback control in CCM mode and with quasi-resonant peak current control in BCM mode; impedance-based stability mechanism is analyzed. Based...
As stereo video become more and more popular the copyright protection for stereo video become more and more important. For stereo video, besides the normal video attack, it is easy to transfer it to a 2D video to pirate the copyright, while current stereo watermark scheme ignore this requirement which only can extract the watermark if both views are exist. A new stereo video watermarking method is...
Based on photovoltaic (PV) grid-connected micro-inverter an optimized sine-wave control strategy is proposed in this paper and the high efficiency, small volume and low harmonious micro-inverter is achieved. Furthermore harmonic issues under quasi-resonant ZVS mode with flyback inverter and current source grid-connected are analysised in depth to realize grid-connected power generation with high efficiency...
Append-only file systems, with which data can only be updated in an append-only manner, are of great importance to the regulatory compliance requirements for storing immutable data. However, existing approaches fail to provide the verifiability of the append-only property of the file system in the presence of an inside attacker who can manipulate on-disk data directly, and thus are unsuitable for...
Cities at Prefecture Level or above are very important in national economy and social development in China. In order to evaluate the comprehensive competitiveness level during multi-year of these cities, based on analysis of urban comprehensive competitiveness, grey clustering model and spatial analysis function of GIS are applied to analyze and evaluate the comprehensive competitiveness of 266 important...
Ontology is a crucial building block of semantic web, which is accepted as the most advanced knowledge representation model. But ontology learning is a big obstacle for its complexity and labor-denseness. We use rule-based information extraction (IE) to get instances from text. There is great challenge for the adaptivity of IE for ontology learning, so we put forward RGA-CIE - a rule generation algorithm...
Semantic Web technologies bring new benefits to knowledge-based question answering system. Especially, ontology is becoming the pivotal methodology to represent domain-specific conceptual knowledge in order to promote the semantic capability of a QA system. In this paper we present a QA system in which the domain knowledge is represented by means of ontology. In addition, personalized services are...
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