The research carried out in the MRIM targets Information Retrieval and Mobile Computing domains. While studies done in Information Retrieval are dedicated to satisfy users information needs from a huge corpus of documents, those which are conducted in Mobile Computing are dedicated to satisfy mobile users needs in terms of services taken from a corpus of services and then, composed altogether: in both domains, users express their needs through queries, and the system gives back relevant documents or personalised services i.e., documents/services that match users’ request.

An Information Retrieval system merely informs on the existence (or non-existence) and whereabouts of documents relating to his request”, as Lancaster wrote in 1968. Nowadays hundreds of millions of people use Information Retrieval systems every day when they use a web search engine or search their emails, and thus Information Retrieval has become the dominant form of information access. For the last decade, the context of Information Retrieval has broadened not only to include all types of data (texts, images, video, etc.), but also to all types of users, and has been widely used through other applications ( ltering, recommending systems, social networks, etc). International competitions in this field off er opportunities for both industrial and academic to compare the performances of their systems and approaches, and have now reach a high level in terms of quantity of data, in terms of tasks, in terms of type of corpus, etc.

The research developed in the MRIM group is dedicated to Information Retrieval and access, and Mobile Computing, through 4 main axes:

  1. Formalization and models for Information Retrieval;
  2. Development of operational models. The access to digital data includes many facets: the data itself (structure, type), the access to data (multilingual, remote access), and the individualized access (personalization, fi ltering ). The work of the MRIM teams is therefore divided in the five following sub axes:
    1. indexing and retrieval of structured documents;
    2. multimedia indexing and retrieval (including still images and videos);
    3. contextual mobile information access;
    4. semantic and multilingual access to textual information;
  3. Evaluation and production of resources. We work on the nal evaluation of developed systems by participating at international campaigns but we also are members of advisory committees for international campaigns. We also product annotated resources needed for system evaluation.
  4. Design and implementation of software systems which provide context-aware personalised services for mobile users. This axis has started with the arrival of Ahmed Lbath in the group in March 2012 as Professor at UJF.