These days life has become completely mobile. Today neither a person does have to sit in front of his home computer to search for nearby restaurants in Google, nor does he or she have to do the same for knowing the transport schedule before leaving for work. With the advent of mobile phones and Online-Social-Networks it has become very easy to communicate with friends, find shopping destination...

In the last years, the availability of cheap mobile devices able to communicate via radio interfaces and equipped with low cost positioning technologies, like GPS, has brought to researcher attention a new kind of services: location based services (LBS). LBS require users to provide their position in order to customize the service. This, of course, could be a threat for user privacy by at least...

Locations-based services are a promising revenue source for the market players in mobile business. A critical parameter for accruing revenue is the applied pricing strategy. This paper proposes the introduction of bundle pricing in the market of location-based services and describes a research model that will be used to test its applicability and indicate its robustness. To motivate the propose...

Location-based services (LBS) are considered the most popular mobile telecommunication services besides the traditional ones, for example, SMS and MMS. They are believed to constitute the killer applications for next generation mobile networks, since they enable adaptive location-driven content provision. Such services can be provided wherever the location of mobile users can be determined. Now...

Enhancing the physical environment of users with IT and communication elements is one of the main objectives of the pervasive computing paradigm. The so-called “smart spaces”, which are typical pervasive computing environments, combine computing infrastructure with intelligent and context-aware services in order to advance the users’ computing experience. In this paper we describe the basic met...

Many emerging applications of location-based services continuously monitor a set of moving objects and answer queries pertaining to their locations. Query processing in such services is critical to ensure high performance of the system. Observing that one predominant cost in query processing is the frequent accesses to the database, in this paper we describe how to reduce the number of moving o...

There exists a wide variety of location-based services (LBSs) that simplify our daily life. While engaging with LBSs, we disseminate accurate location data to remote machines and thus lose control over our data. It is well known that this raises significant privacy concerns as access to accurate location data may reveal sensitive information about an individual. In this work, we investigate the...

Location-based services (LBS) constitute an emerging application domain involving spatio-temporal databases. In this paper, i) we propose a classification of LBS, depending on whether the user (query object) and the data objects are moving or not and ii) we provide algorithms for the efficient support of real applications, for every class. We also survey recent work in query processing for the ...

With the emergence of location-based services, such as Foursquare and Gowalla, users are allowed to easily perform check-in actions anywhere and anytime. The locationbased check-in not only enables personal geospatial journeys but also serves as a kind of fine-grained source for trip planning. In this work, we aim to collectively compose traveling paths by leveraging the check-in data through m...

When traveling and visiting new places, tourists are mobile as they wander around and follow tours through cities and landscapes. Location-based mobile systems today typically provide and deliver the the same information to all users which however does not necessarily meet the individual user’s needs. In the presented approach, we aim to address the limitations of mobile devices, the unreliabil...