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This paper establishes a risk assessment index system for oil and gas resource countries, with 46 screened indicators across 5 dimensions, namely political risk, economic risk, investment risk, oil and gas resources risk, and the Chinese factor. Furthermore, by using the principal component analysis method, the 46 risk indicators were narrowed down to 16 principal components. Subsequently, a support...
Previously, we proposed efficient, scalable decentralized processing of SPARQL queries for an ad-hoc Semantic Web data sharing system and explored optimization techniques. However, it has proven to be difficult to measure the performance of the proposed query processing in a decentralized settings with existing tools. This is because assessments on SPARQL query performance were typically targeted...
Content-based publish/subscribe systems allow subscribers to specify interests based on event contents, rather than pre-assigned event topics. Since most of existing publish/subscribe systems use FIFO (First In First Out) as its queue management mechanism, it may face network congestion coming from suddenly burst of huge amount of subscription messages as well as event notifications. To promote the...
Recent research has introduced load balancing schemes that are aware of the input data distribution (i.e., data profile) to mitigate data skew and fully exploit the parallel capability of the MapReduce framework to support record linkage. However, existing solutions face a significant scalability issue when applied to massive data sets with millions or billions of blocks (a basic unit in record linkage)...
We propose a new type of photonic crystal waveguide structure to achieve wideband slow light with large group index and low dispersion. The waveguide is based on triangular lattice photonic crystal imposed by simply a selective altering the locations of the holes adjacent to the line defect. Keeping the group index at 31, 44, 61, 71, 94, and 132, respectively, while restricting its variation within...
Recently, with the constant development of application of high-dimensional data query, the index-based nearest neighbor retrieval has greatly improved the efficiency and accuracy of retrieval. The approximate nearest neighbor query is proposed and applied to get high performance to ease the curse of dimensionality to a certain extent. However, the heuristic pruning method may prune many local optimal...
This paper introduced our independently developed media monitoring system on city image from five aspects: background, process, architecture, index and application. The system targets on monitoring, analyzing and evaluating a city's image, then help the city accurately know about itself, monitor its news and issues, propose its public relations strategies, market its city brand while perfectly shape...
Customers always complain that anti-virus softwares bog down their computers by consuming much of PC memories and resources. With the popularity and variety of zero- day threats over the Internet, security companies have to keep on inserting new virus signatures into their databases. However, is the increasing size of the signature file the sole reason to drag computers to a crawl during the virus...
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