Victor Felea

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Navigation aids for the pedestrians are considered new research challenges. The visually impaired are particularly concerned, because of their need to detect and avoid obstacles, as well as to orient themselves in unknown environments. In this paper, we discuss some existing projects in this domain and we propose a novel aid system formed of wireless(More)
In this paper, we propose OBMAC, an enhancement for medium access control (MAC) protocol based on the overhearing technique in wireless sensor networks (WSNs). In this type of networks, sensors are spatially correlated and they often sense and send the same information to the sink. Therefore, sensors waste energy in transmitting redundant data. Here, we(More)
  • Victor Felea
  • 2009 First International Confernce on Advances in…
  • 2009
In this paper we define a new notion of containment for two queries, called strong containment. The strong containment implies the classical containment. A necessary and sufficient condition for the strong containment relation between two queries is given. The time complexity of the decision problem for two queries to be in strong containment relation is a(More)
The problem of counting satisfiability, i.e. count the number of satisfying assignments for a SAT problem, is used successfully in a number of problems. For example, it can provide heuristics for guiding planning and search, where an estimation of the probability for a given search would help lead to a goal. Counting satisfiability is a valuable approach(More)
The ETL (extract, transform and load) processes are responsible for the extraction of the data from the external sources, transforming the data in order to satisfy the integration and cleanness needs and for loading the data into the data warehouse. In the data mining field, there is a special concern on using the metrics for efficient classification(More)