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Due to rich characteristics and functionalities, PDF format has become the de facto standard for the electronic document exchange. As vulnerabilities in the major PDF viewers have been disclosed, a number of methods have been proposed to tame the increasing PDF threats. However, one recent evasion exploit is found to evade most of detections and renders all of the major static methods void. Moreover,...
Segmentation of brain magnetic resonance imaging (MRI) data plays an important role in the computer-aided diagnosis and neuroscience research. Fuzzy c-means (FCM) clustering algorithm is one of the most usually used techniques for brain MRI image segmentation because of its fuzzy nature. However, the conventional FCM method fails to carry out segmentation well enough due to intensity inhomogeneity...
WIA-PA (Wireless Networks for Industrial Automation-Process Automation) standard has become one of the three major IEC (International Electrotechnical Commission) standards for industrial wireless networks technology, and multi-channel frequency hopping mechanism is significant for the performance of WIA-PA networks. Existing AFH (adaptive frequency hopping) mechanism for WIA-PA networks is based...
This paper presents a path planning and collision avoidance method based on artificial bee colony (ABC) optimization algorithm for multi-robot systems. Standard ABC algorithm can find a proper way for the robots quickly, but it still has shortcomings. An improved artificial bee colony optimization algorithm (IABC) is proposed to plan a reasonable collision-free path for each robot of a multi-robot...
The design of multi-Gbps LDPC decoder has become a hot topic in recent years as the demand of the transformation towards 4G. In this paper, we describe an energy efficient multi-Gbps LDPC decoder engine based on ASIP using Target tool suite. The ASIP core can be configured as half-layer paralleled or quarter-layer paralleled decoding, which offers a good trade-off between the throughput and power/area...
NCS (Network Coordinate System) provides us an effective way through which we can predict a network node's distance. NCS has been applied to a huge number of Internet applications. In this paper, we build a differential dynamic model to analyze the global dynamical behavior of a famous NCS algorithm Vivaldi and study the convergence problem existing in it. As a result, our model suggest that TIVs...
Information retrieval provides useful information suitable for policy-making. How to apply information retrieval technology into daily use is a hot topic that deserves our foucs. Take journals evaluation for example, this paper do research on how to use the database inquiry technology provided by China National Knowledge Infrastructure (CNKI) to collect data of Journal of Guangdong University of Business...
A synchronized sampling controller based on direct digital synthesis was developed in NIM China. It's used in the transfer standard for harmonic measurement. The working fundamental frequency of the controller is 45 to 65 Hz; the trigger output frequency is 11.5 kHz to 16.6 kHz due to the 256 times of the fundamental frequency. The resolution of the controller is less than 1 µHz.
A transfer standard of harmonic voltage and current based on the synchronized sampling technology was developed in NIM China. The working fundamental frequency of the transfer standard is 45 to 65 Hz; the highest order is within 50th; the range is 120 V and 5 A. The accuracy of the harmonic voltage is 30 µV/V (of the fundamental voltage) and the harmonic current is 40 µA/A (of the fundamental current).
Evaluation of the dynamic performance characteristics of several different types of electrical energy meters using experimental equipment are presented, including the development of the dynamic power source, the selection of the standard meter to provide reference values, and the estimation of the uncertainties. Their behaviors and results are reported and analyzed.
Soft output demapping is crucial for emerging standards with Turbo or LDPC FEC schemes. Existing soft output demapping techniques incur several problems when implementing on state of the art baseband processors: (1) too many operations, the number of average operation per-bit is even higher than that of FFTs; (2) difficult to exploit the potential parallelism supported by baseband processors; (3)...
The crawler system in a vertical search engine should format a representative sample web page so at to make sure that the page could meet the W3C standards, which make it available that the processed page can be resolved by the visual XPath generator and then the desired XPath value will be found out. In batch-data-extraction, some exact data will be available when object web pages are parsed by the...
Wireless communication standards are continuously evolving and getting more diverse.This requires a wide variety of baseband implementations within a short time-to-market. Besides, deep sub-micron technology significantly increases the design complexity and associated cost. These yield a growing need for reconfigurable/programmable baseband solutions. Implementing the whole base band functionality...
With the development of geoscience and semantic technologies, more and more earth systems begin to use ontology in its system model designing. In this paper, we analyze the current main works of designing and using ontologies in geo-science domain from their architecture and components. By the analysis, we conclude that geo-science ontology infrastructure will be the key of new geo-science system,...
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