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PURPOSE To report the results of arc-therapy radiosurgery for cerebral arteriovenous malformation (AVM) and to compare the adverse event rate with the rate expected from the natural history. METHODS AND MATERIALS We performed a retrospective study of our 118 first patients with a mean follow-up of 46 months (range, 5-105 months). The AVMs had features(More)
Nowadays data sets are available in very complex and heterogeneous ways. The mining of such data collections is essential to support many real-world applications ranging from healthcare to marketing. In this work, we focus on the analysis of " complex " sequential data by means of interesting sequential patterns. We approach the problem using an elegant(More)
PURPOSE To compare two therapeutic modalities on anatomic and functional results after idiopathic macular hole (MH) surgery: seated vs face-down position. DESIGN Multicenter, prospective, randomized trial. METHODS SETTING University Hospital Dijon and University Hospital Nancy. PATIENTS One hundred and forty-four patients (150 eyes) were enrolled(More)
In this paper, we presents a research work based on formal concept analysis and interest measures associated with formal concepts. This work focuses on the ability of concept lattices to discover and represent special groups of individuals, called social communities. Concept lattices are very useful for the task of knowledge discovery in databases, but they(More)
In this paper, we are interested in the analysis of sequential data and we propose an original framework based on FCA. For that, we introduce sequential pattern structures, an original specification of pattern structures for dealing with sequential data. Sequential pattern structures are given by a subsumption operation between set of sequences, based on(More)
Cancer data were reviewed in 488 patients who underwent renal transplantation and received cyclosporine at our centre from January 1985 to December 1995. Incidence of nonmelanoma skin cancer (NMSC) was standardized on the age and sex distribution of the French population. For cancer other than NMSC, we calculated the ratio of observed to expected numbers of(More)
The Internet has totally changed the way information is published and shared in medicine. With web 2.0 and semantic web technologies, web applications allow now collaborative information editing in a way that can be reused by machines. These new tools could be used to in local health networks to promote the editing and sharing of medical knowledge between(More)
This paper presents a research work in the domains of sequential pattern mining and formal concept analysis. Using a combined method, we show how concept lattices and interestingness measures such as stability can improve the task of discovering knowledge in symbolic sequential data. We give example of a real medical application to illustrate how this(More)
This paper presents an original experiment based on frequent itemset search and lattice based classification. This work focuses on the ability of iceberg-lattices to discover and represent flows of patient within a healthcare network. We give examples of analysis of real medical data showing how Formal Concept Analysis techniques can be helpful in the(More)
Sequential pattern mining is an approach to extract correlations among temporal data. Many different methods were proposed to either enumerate sequences of set valued data (i.e., itemsets) or sequences containing multidimensional items. However, in many real-world scenarios , data sequences are described as events of both multi-dimensional and set valued(More)