Abstract Due to their limitless possibilities and low cost, RFID systems are powerful object identi cation tools well-suited in everyday applications. When attempting to identify multiple RFID tags from densely populated elds within the shortest timeframe possible, the typical design characteristics of RFID systems lead to a problematic lack of adequate resources to e ciently do so. After a bri...

The main purpose of spatial access methods is to support efficient selection of objects based on spatial properties. For example, a range query selects objects lying within specified ranges of coordinates; a nearest neighbour query finds the object lying closest to a specified object (see Worboys, Chapter 26). Further, spatial access methods are also used to implement efficiently such spatial a...

The rapid increase in spatio-temporal applications calls for new auxiliary indexing structures. A typical spatio-temporal application is one that tracks the behavior of moving objects through location-aware devices (e.g., GPS). Through the last decade, many spatio-temporal access methods are developed. Spatio-temporal access methods focus on two orthogonal directions: (1) Indexing the past, (2)...

Expert search, in which given a query a ranked list of experts instead of documents is returned, has been intensively studied recently due to its importance in facilitating the needs of both information access and knowledge discovery. Many approaches have been proposed, including metadata extraction, expert profile building, and formal model generation. However, all of them conduct expert searc...