Abstract: A method of assisting with the construction of a tree of clusters of electronic documents, the documents being defined by predetermined attributes. The method includes, for a given cluster of documents and a given level of the tree, the following steps: a) obtaining (E300) constraints defined between at least two documents of said cluster and storing those constraints; b) constructing (E310) subclusters as a function of the constraints obtained and the attributes of the documents of said cluster; c) creating (E320) a tree level corresponding to the subclusters created; and d) selecting (E340) a created subcluster and iterating the steps a), b), c) and d) for the selected subcluster until said tree is obtained. A device for implementing the method is also disclosed.

Abstract: A method of assisting with the construction of a tree of clusters of electronic documents, the documents being defined by predetermined attributes. The method includes, for a given cluster of documents and a given level of the tree, the following steps: a) obtaining (E300) constraints defined between at least two documents of said cluster and storing those constraints; b) constructing (E310) subclusters as a function of the constraints obtained and the attributes of the documents of said cluster; c) creating (E320) a tree level corresponding to the subclusters created; and d) selecting (E340) a created subcluster and iterating the steps a), b), c) and d) for the selected subcluster until said tree is obtained. A device for implementing the method is also disclosed.

Abstract: An automatic method for learning frequent chronicles in an alarm log of a dynamic system for supervision of the system, and a learning system for using the method in a supervision system. According to the method, in an alarm log, alarm sequences are selected and then grouped in groups of similar sequences. Alarms of the groups are then used to produce partial logs. Frequent chronicles are then learned on each transmitted partial log and the partial set of frequent chronicles is determined. Then a set of chronicles in the log is formed with chronicles of the various partial sets.

Abstract: A method for the building and use of a table of reduced profiles of paragons enables the summarizing of a table of profiles of a set of individuals, all the profiles being defined by a same set of indicators, the profile of a given individual comprising values for said set of indicators that are proper to said given individual.

Abstract: An automatic method for learning frequent chronicles in an alarm log of a dynamic system for supervision of the system, and a learning system for using the method in a supervision system. According to the method, in an alarm log, alarm sequences are selected and then grouped in groups of similar sequences. Alarms of the groups are then used to produce partial logs. Frequent chronicles are then learned on each transmitted partial log and the partial set of frequent chronicles is determined. Then a set of chronicles in the log is formed with chronicles of the various partial sets.

Abstract: A process for renegotiating, during a communication, the parameters of a traffic contract on an ATM network.The present invention relates to a renegotiation process, during a communication on an ATM network, of the parameters of the traffic contract that relates to this communication. It is characterized in that it consists:a. in predicting, for a predetermined period of time between two successive renegotiations, the maximal length that would be reached by a virtual file fed by the traffic of said communication, for at least a given thruput rate of said file.b. in deducing from said maximal length one or more new parameters for the traffic contract, andc. in renegotiating with the network on the basis of said (new) traffic parameter or parameters for said period of time.

Abstract: An optical signal switch identifies the routing of each optical packet, directs each packet arriving at any input to the output corresponding to the routing, and includes delay lines through which the optical signals pass selectively. The switch has three stages: a first stage directing each optical packet received at an input to a chosen delay line, a second stage coupled to the output of the delay lines to direct the optical packets selectively to the output corresponding to the determined routing, and an output third stage.

Abstract: A system for measuring an electrical signal in a frequency range substantially equal to the bandwidth the signal close to the gigahertz includes two laser sources. A first laser source emits a first light wave which is polarized, then amplitude-modulated by the electrical signal through an electro-optic medium. A second laser source emits a second light wave which is polarized, and then is combined with the amplitude-modulated wave to produce a measurement wave characterizing the phase and frequency of the electrical signal to be measured. The beat between the frequencies of the two polarized waves is checked thereby transposing the measurement wave into the frequency range.