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In a mobile environment, user's physical location plays an important role in determining access to resources. However, because current moving object databases do not keep the exact location of the moving objects, but rather maintain their approximate location for reasons of minimizing the updates, the access request evaluation cannot always guarantee the(More)
Location based services, one of the promising markets of mobile commerce , aims at delivering point of need personalized information. Often, these services to be delivered are based on the prior knowledge of the profiles of mobile customers and security and privacy policies dictated by them. These policies may specify revealing the sensitive information of(More)
Mining discrete patterns in binary data is important for many data analysis tasks, such as data sampling, compression, and clustering. An example is that replacing individual records with their patterns would greatly reduce data size and simplify subsequent data analysis tasks. As a straightforward approach, rank-one binary matrix approximation has been(More)
Mobile environment a b s t r a c t Location based services (LBS) aim to deliver information based on a mobile user's location. However, knowledge of the location can be used by an adversary to physically locate the person, leading to the risk of physical harm, as well as possible leakage of certain personal information. This has serious consequences on(More)
Recent advances to mobile communication, Global Positioning System (GPS) and Radio Frequency Identification (RFID) technologies have propelled the growth of a number of mobile services. These require maintaining mobile object's location information and efficiently serving access requests on the past, present and future status of the moving objects.(More)
In the last decade, mobile communication has enjoyed unprecedented growth all over the world. The recent advances in mobile communication technologies including Global Positioning System (GPS) and Radio Frequency Identification (RFID) have propelled the growth of a number of mobile services. Typically , these require maintaining the mobile objects' location(More)