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Energy conservation is a key issue for algorithm designs in wireless sensor networks. In this paper, we explore in-network aggregation techniques for answering top-k queries in wireless sensor networks. A top-k query retrieves the k data objects with the highest scores evaluated by a scoring function on interested features of sensor readings. Our study shows that existing techniques for processing...
A k-Range Nearest Neighbor (or kRNN for short) query in road networks finds the k nearest neighbors of every point on the road segments within a given query region based on the network distance. The kRNN query is significantly important for location-based applications in many realistic scenarios. For example, (1) the user's location is uncertain, i.e., user's location is modeled by a spatial region,...
A privacy-aware proximity detection service determines if two mobile users are close to each other without requiring them to disclose their exact locations. Existing proposals for such services provide weak privacy, give low accuracy guarantees, incur high communication costs, or lack flexibility in user preferences. We address these shortcomings with a client-server solution for proximity detection,...
Vehicle GPS data is an essential "raw" material for a broad range of applications such as traffic management and control, routing, and navigation. To become useful, the data has to be related to the underlying road network by means of map matching algorithms, which are often computationally expensive. In addition, GPS data is not accurate and often needs to be cleaned to remove erroneous...
Call Detail Record (CDR) databases contain many millions of records with information about mobile phone calls, including the users' location when the call was made/received. This huge amount of spatio-temporal data opens the door for the study of human trajectories on a large scale without the bias that other sources, like GPS or WLAN networks, introduce in the population studied. Furthermore, it...
In a Mobile Ad-hoc NETwork (MANET), information sharing is usually performed by distributing advertisements and queries. In order not to load environments with unnecessary traffic, an advertisement policy should be designed according to users’ information consumptions and provisions, which are limited by users’ stay-times and their contexts. In this paper, we propose an algorithm to parameterize advertisement...
The applications of wireless sensor networks often require region representations of the phenomena that the networks monitor for visualization and interaction with spatial databases. However, there is a fundamental gap between the point-based sensor observation of non-regular sensor deployment and the spatio-temporal phenomena represented by regions. This paper proposes to bridge the gap by providing...
Thanks to advances in mobile technology, modern mobile devices have become essential companions, assisting their users in attaining their daily tasks. It will not be long before these devices will become recommending companions, advising users about what data (e.g., restaurants) and what services e.g., podcast channels) they may enjoy in the local area at the present time Because of the very nature...
A spatial monitoring query (SMQ) retrieves the set of mobile nodes that satisfy some spatial constraints, and provides real-time updates whenever this set of nodes changes. Efficient processing of such queries is essential to moving objects database management. Existing techniques rely on one or more central servers for query management and assume each mobile node can communicate with some server...
Flash disks are being widely used as an important alternative to conventional magnetic disks, although accessed through the same interface by applications, their distinguished feature, i.e., different read and write cost in the aspects of time, makes it necessary to reconsider the design of existing replacement algorithms to leverage their performance potential. Different from existing flash-aware...
Mobile Cloud Computing is widely accepted as a concept that can significantly improve the user experience when accessing mobile services. By removing the limitations of mobile devices with respect to storage and computing capabilities and providing a new level of security by a centralized maintenance of security-critical software for e.g. mobile payment applications, it is expected that it will find...
The emerging location-detection devices together with ubiquitous connectivity have enabled a large variety of location-based services (LBS). Unfortunately, LBS may threaten the users’ privacy. K-anonymity cloaking the user location to K-anonymizing spatial region (K-ASR) has been extensively studied to protect privacy in LBS. Traditional K-anonymity method needs complex query processing algorithms...
Information sharing among vehicles is an emergent issue in Vehicular Ad Hoc Networks (VANETs). Considering the mobility and limited connectivity of the nodes in a typical VANET, designing scalable schemes for information sharing is challenging. In this paper, we propose a distributed peer-to-peer (P2P) based architecture for information sharing in VANETs. We split the entire vehicular network into...
Remote health monitoring has tremendous potential to improve quality of health care services in modern and ubiquitous medical environments. It helps to cut the cost in modern healthcare by avoiding unnecessary hospital visits for frequent checkups. In this context, security and protection of sensitive medical data and measurements such as Electronic Health Records (EHR), data integrity and confidentiality...
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