Guénaël Cabanes

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One of the most crucial questions in many real-world cluster applications is determining a suitable number of clusters, also known as the model selection problem. Determining the optimum number of clusters is an ill posed problem for which there is no simple way of knowing that number without a priori knowledge. In this paper we propose a new two-level(More)
Worker sterility is a defining characteristic of eusociality. The existence of the sterile worker caste remains a fundamental question for evolutionary biology as it requires the existence of genes that reduce personal reproduction. Currently, little is known about the proximate mechanisms underpinning worker sterility. Studies into a mutant "anarchistic"(More)
Clustering is a very powerful tool for automatic detection of relevant sub-groups in unlabeled data sets. In this paper we focus on interval data: i.e. where the objects are defined as hyper-rectangles. We propose here a new clustering algorithm for interval data, based on the learning of a Self Organizing Map. The major advantage of our approach is that(More)
Because of its physical and mechanical properties, the odontologic applications of ultrasound are increasing. A new application of odontologic ultrasonic generators involves the lateral approach of the maxillary sinus in sinus augmentation. The procedure may provide important advantages over conventional ostectomy using diamond drills, as it reduces the(More)
Determining the optimum number of clusters is an ill posed problem for which there is no simple way of knowing that number without a priori knowledge. The purpose of this paper is to provide a simultaneous two-level clustering algorithm based on self organizing map, called DS2L-SOM, which learn at the same time the structure of the data and its(More)
Sex differences in human social behaviors and abilities have long been a question of public and scientific interest. Females are usually assumed to be more socially oriented and skillful than males. However, despite an extensive literature, the very existence of sex differences remains a matter of discussion while some studies found no sex differences(More)
Radio Frequency IDentification (RFID) is an advanced tracking technology that can be used to study the spatial organization of animal societies. The aim of this work is to build a new RFID-based autonomous system to follow individuals spatio-temporal activity, which is not currently available, and to develop new tools for automatic data mining. We study(More)
In many cases, databases are in constant evolution, new data is arriving continuously. Data streams pose several unique problems that make obsolete the applications of classical data analysis methods. Indeed, these databases are constantly on-line, growing with the arrival of new data. In addition, the probability distribution associated with the data may(More)