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Intelligent transportation systems, e.g., Uber, have become an important tool for urban transportation. An important problem is k nearest neighbor (kNN) search on moving objects with road-network constraints, which, given moving objects on the road networks and a query, finds k nearest objects to the query location. Existing studies focus on either kNN search on static objects or continuous kNN search...
Internet users are shifting from searching on traditional media to social network platforms (SNPs) to retrieve up-to-date and valuable information. SNPs have two unique characteristics: frequent content update and small world phenomenon. However, existing works are not able to support these two features simultaneously. To address this problem, we develop a general framework to enable real time personalized...
Aiming at recognizing the complex terrain of coal mines, in order to perform path planning and safe navigation, the first thing is to solve the problem of traversability analysis for coal mine exploring robots. This paper designed a model for traversability analysis on uneven terrain based on rough sets. By comprehensively analyzing the terrain features and classification features etc., this model...
A common approach to performing keyword search over relational databases is to find the minimum Steiner trees in database graphs. These methods, however, are rather expensive as the minimum Steiner tree problem is known to be NP-hard. Further, these methods cannot benefit from DBMS capabilities. We propose a new concept called Compact Steiner Tree (CSTree), which can be used to approximate the Steiner...
With the rapid development of the Internet technology, the structured data are more and more prevalent in the Internet. Moreover, most Web sites organize their data systematically and relevant data may be separated into different pages but linked through hyperlinks. However, the existing Web search engines cannot integrate information from multiple interrelated pages to answer keyword queries meaningfully...
The leap from single-core to multi-core has permanently altered the course of computing, enabling increased productivity, powerful energy-efficient performance, and leading-edge advanced computing experiences. Although traditional single-thread XPath query evaluation algorithms can run properly on multi-core CPUs, they cannot take full use of the computing resources of multi-core CPUs. To take advantage...
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