Directed binary hierarchies have been introduced in order to give a graphical reduced representation of a family of association rules. This type of structure extends in a very specific way that underlying binary hierarchical classification. In this paper an accurate formalization of this new structure is studied. A binary directed hierarchy is defined as a set of ordered pairs of subsets of the...

We consider graphs which contain both directed and undirected edges (partially directed graphs). We show that the problem of covering the edges of such graphs with a minimum number of edge-disjoint directed paths respecting the orientations of the directed edges is polynomially solvable.We exhibit a good characterization for this problem in the form of a min–max theorem.We introduce a more gene...

Cross-linguistic studies on unsupervised word segmentation have consistently shown that English is easier to segment than other languages. In this paper, we propose an explanation of this finding based on the notion of segmentation ambiguity. We show that English has a very low segmentation ambiguity compared to Japanese and that this difference correlates with the segmentation performance in a...

Introduction: Online formative assessments (OFA’s) have beenincreasingly recognised in medical education as resources thatpromote self-directed learning. Formative assessments are usedto support the self-directed learning of students. Online formativeassessments have been identified to be less time consuming withautomated feedback. This pilot study aimed to determine whetherparticipation and pe...

conclusions: implementation of self-directed learning provides a useful strategy that should be included in health intervention and national surveillance programs in order to improve health and therapeutic compliance in postmenopausal women. results: there were significant statistical differences between two groups regarding the age of subjects; age of menopause; economic, educational and emplo...

this study is an attempt to answer three questions: first, whether there is a difference between the grammatical competence de- velopment of a group of children aged 2;6 vs. a group of children aged 3;6. second, whether there is a relationship between the children’s age and their mlu on the one hand and their speech and the caretakers’ speech on the other. third, whether or not the normal limit...