This paper addresses the signal acquisition problem in the presence of interferences using antenna arrays in the general framework of Global Navigation Satellite Systems receivers. We describe and compare two different approaches: the first one is based on the generalized likelihood ratio test (GLRT) detector directly applied on the array snapshots, and the second one uses a digital beamformer ...

Over the last ten years a community on context has emerged. Brézillon (1999) proposed a survey of the literature about context in artificial intelligence. There is a now series of conference on context, a web site and a mailing list. The number of web pages with the word “context” has been multiply by ten in the last five years. Being among the instigators of the use of context in real-world ap...

At a time when social media revolutionize the exchange of information between users of the Web 2.0, many enterprises are still applying older collaboration paradigms. Following the explosion of blogs and social sharing services on the Internet, some companies are beginning to catch up with these trends, but not all employees are familiar with these new practices which require manual contributio...

This longitudinal case study tracks an adult second-language (L2) learner’s quality and quantity of encounters with 20 vocabulary items in an English for Academic Purposes course over 3 months. The learner completed pretest and posttest vocabulary knowledge interviews, submitted course materials and notes for analysis, and was observed during class lessons. The results show that frequency of en...

Both representing cases as fixed scripts as well as the development of initial expert systems as a basis for computer based tutoring systems is particularly difficult and time intensive in a multi-institutional development project. On the other hand, structured systematic knowledge and a common terminology is necessary for automatic generation of information and quiz pages as well as automatic ...