Mahmoud Attia Sakr

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Capturing moving objects data is now possible and becoming cheaper with the advances in the positioning and sensor technologies. The increasing amount of such data and the various fields of applications call for intensive research work for building a spatiotemporal DBMS. This involves several aspects such as modeling the moving objects data, designing query(More)
In previous work, we have proposed a tool for <i>Spatiotemporal Pattern Query</i>. It matches individual moving object trajectories against a given movement pattern. For example, it can be used to find the situations of <i>Missed Approach</i> in ATC data (Air Traffic Control systems, used for tracking the movement of aircrafts), where the landing of the(More)
In this paper, we demonstrate our results of designing and implementing spatiotemporal pattern queries. That is, one can specify temporal order constraints on the fulfillment of predicates on moving objects. Compared with other approaches, our approach is not restricted in terms of the types of moving object or the sets of predicates. Our work covers the(More)
The availability of devices that can be used to track moving objects has increased dramatically leading to a great growth in movement data from almost every application domain. Therefore, there has been an increasing interest in proposing new methodologies for indexing, classifying, clustering, querying and measuring similarity between moving objects' data.(More)
Advances in location acquisition and mobile technologies led to the addition of the location dimension to Social Networks (SNs) and to the emergence of a newer class called Location-Based Social Networks (LBSNs). While LBSNs are richer in their model and functions than SNs, they fail so far to attract as many users as SNs. On the other hand, SNs have large(More)
This article reports the optical properties such as absorption profile, molar absorptivity, fluorescence profile and photo-physical parameters such as dipole moment, oscillator strength, fluorescence quantum yields, fluorescence lifetimes, laser performance and finally photostability of 2,5-Bis(5-tert-butyl-benzoxazol-2-yl)thiophene(More)
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