The diachronic emergence of retroflex segments in three languages

The present study shows that though retroflex segments can be considered articulatorily marked, there are perceptual reasons why languages introduce this class into their phoneme inventory. This observation is illustrated with the diachronic developments of retroflexes in Norwegian (North- Germanic), Nyawaygi (Australian) and Minto-Nenana (Athapaskan). The developments in these three languages are modelled in a perceptually oriented phonological theory, since traditional articulatorily-based features cannot deal with such processes

Principal manifolds and graphs in practice: from molecular biology to dynamical systems

We present several applications of non-linear data modeling, using principal manifolds and principal graphs constructed using the metaphor of elasticity (elastic principal graph approach). These approaches are generalizations of the Kohonen's self-organizing maps, a class of artificial neural networks. On several examples we show advantages of using non-linear objects for data approximation in comparison to the linear ones. We propose four numerical criteria for comparing linear and non-linear mappings of datasets into the spaces of lower dimension. The examples are taken from comparative political science, from analysis of high-throughput data in molecular biology, from analysis of dynamical systems.Comment: 12 pages, 9 figure

A Seeded Genetic Algorithm for RNA Secondary Structural Prediction with Pseudoknots

This work explores a new approach in using genetic algorithm to predict RNA secondary structures with pseudoknots. Since only a small portion of most RNA structures is comprised of pseudoknots, the majority of structural elements from an optimal pseudoknot-free structure are likely to be part of the true structure. Thus seeding the genetic algorithm with optimal pseudoknot-free structures will more likely lead it to the true structure than a randomly generated population. The genetic algorithm uses the known energy models with an additional augmentation to allow complex pseudoknots. The nearest-neighbor energy model is used in conjunction with Turner’s thermodynamic parameters for pseudoknot-free structures, and the H-type pseudoknot energy estimation for simple pseudoknots. Testing with known pseudoknot sequences from PseudoBase shows that it out performs some of the current popular algorithms

Grammar of Location and Motion in Zande

In Zande expressions of position and motion are arranged on a gamut in correlation with increasing syntactic complexity. Topological relations, expressed by basic locative construction are at the left end, directed motion at the right end. Directed translational motion is marked by the preposition ku, which also marks angular location. Topological relations, in situ motion and undirected translational motion do not get a specific marking. This indicates the interrelatedness of stasis and motion on the one hand and undirected and directed motion on the other hand

The role of linguistics in language teaching: the case of two, less widely taught languages - Finnish and Hungarian

This paper discusses the role of various linguistic sub-disciplines in teaching Finnish and Hungarian. We explain the status of Finnish and Hungarian at University College London and in the UK, and present the principle difficulties in learning and teaching these two languages. We also introduce our courses and student profiles. With the support of examples from our own teaching, we argue that a linguistically oriented approach is well suited for less widely used and less taught languages as it enables students to draw comparative and historical parallels, question terminologies and raise their sociolinguistic and pragmatic awareness. A linguistic approach also provides students with skills for further language learning

Interaction Grammars

Interaction Grammar (IG) is a grammatical formalism based on the notion of polarity. Polarities express the resource sensitivity of natural languages by modelling the distinction between saturated and unsaturated syntactic structures. Syntactic composition is represented as a chemical reaction guided by the saturation of polarities. It is expressed in a model-theoretic framework where grammars are constraint systems using the notion of tree description and parsing appears as a process of building tree description models satisfying criteria of saturation and minimality