The continuous development of wireless networks and mobile devices has motivated an
intense research in mobile data services. Some of these services provide the user with …

Moving Objects Databases is the first uniform treatment of moving objects databases, the
technology that supports GPS and RFID. It focuses on the modeling and design of data from …

This paper intoduces the Scalable INcremental hash-based Algorithm (SINA, for short); a
new algorithm for evaluting a set of concurrent continuous spatio-temporal queries. SINA is …

In this paper we propose an approach that enables mobile clients to determine the validity of
previous queries based on their current locations. In order to make this possible, the server …

Time-parameterized queries (TP queries for short) retrieve (i) the actual result at the time that
the query is issued,(ii) the validity period of the result given the current motion of the query …

Recent research has focused on continuous monitoring of nearest neighbors (NN) in highly
dynamic scenarios, where the queries and the data objects move frequently and arbitrarily …

Web users and content are increasingly being geopositioned, and increased focus is being
given to serving local content in response to web queries. This development calls for spatial …

Mobile location-dependent information services (LDISs) have become increasingly popular
in recent years. However, data caching strategies for LDISs have thus far received little …

A very important class of spatial queries consists of nearest-neighbor (NN) query and its
variations. Many studies in the past decade utilize R-trees as their underlying index …

The tremendous increase in the use of cellular phones, GPS-like devices, and RFIDs results
in highly dynamic environments where objects as well as queries are continuously moving …