Supporting telecom business processes by means of workflow management and federated databases

This report addresses the issues related to the use of workflow management\ud systems and federated databases to support business processes that operate on\ud large and heterogeneous collections of autonomous information systems. We\ud discuss how they can enhance the overall IT-architecture. Starting from the\ud OSCA architecture, we develop an architecture that includes workflow\ud management systems and federated databases. In this architecture, the notion of\ud information systems as a monolithic entity disappears. Instead, business\ud processes are supported directly by workflows that combine presentation\ud blocks, function blocks, and data blocks. We address the specific issues of\ud transaction management and change management in such an architecture

Is Skater’s Cramp a Task-Specific Dystonia?

Skater’s cramp is a mysterious and debilitating movement disorder that affects Olympic and amateur speed-skaters alike, often spelling the end of their careers. Affected skaters will often experience a sudden jerk of their foot before placing their skate on the ice after a completed stroke causing instability and risking a fall. Many explanations for skater’s cramp have been proposed, but ensuing treatments have been unsuccessful. Based on clinical and subjective assessments of individual cases of skater’s cramp by neurologists at the UMCG, the diagnosis task-specific dystonia was proposed. The purpose of this thesis was to further investigate this proposed diagnosis, using quantitative measures to help answer our major research question: is skater’s cramp a task-specific dystonia? In multiple experiments collecting clinical, movement, muscle, and psychometric data, results were supportive of the answer: yes. Although not definitive, this evidence is an important first step in better understanding this mysterious disorder, and may eventually lead to more informed and effective treatments for those affected

Linear Form of 3-scale Relativity Algebra and the Relevance of Stability

We show that the algebra of the recently proposed Triply Special Relativity can be brought to a linear (ie, Lie) form by a correct identification of its generators. The resulting Lie algebra is the stable form proposed by Vilela Mendes a decade ago, itself a reapparition of Yang's algebra, dating from 1947. As a corollary we assure that, within the Lie algebra framework, there is no Quadruply Special Relativity.Comment: 5 page

Global geometric deformations of current algebras as Krichever-Novikov type algebras

We construct algebraic-geometric families of genus one (i.e. elliptic) current and affine Lie algebras of Krichever-Novikov type. These families deform the classical current, respectively affine Kac-Moody Lie algebras. The construction is induced by the geometric process of degenerating the elliptic curve to singular cubics. If the finite-dimensional Lie algebra defining the infinite dimensional current algebra is simple then, even if restricted to local families, the constructed families are non-equivalent to the trivial family. In particular, we show that the current algebra is geometrically not rigid, despite its formal rigidity. This shows that in the infinite-dimensional Lie algebra case the relations between geometric deformations, formal deformations and Lie algebra two-cohomology are not that close as in the finite-dimensional case. The constructed families are e.g. of relevance in the global operator approach to the Wess-Zumino-Witten-Novikov models appearing in the quantization of Conformal Field Theory.Comment: 35 pages, AMS-Late