As workflow management systems become more complex and critical to an organisation’s performance, there is an opportunity for a new generation of workflow management products. These products could greatly increase the scope of workflow management systems in target application areas. One of the key extensions to workflow management systems will be the use of transactional semantics to increase r...

The specification of business processes is becoming a more and more critical aspect for organizations. Such processes are specified as workflow models expressing the logical precedence among the different business activities (i.e., the units of work). Up to now, workflow models have been commonly managed through specific subsystems, called workflow management systems. In this paper we advocate ...

This paper highlights the need for adaptive workflow management, classifies various types of workflow adaptation, and discusses potential mechanisms for achieving adaptive workflow management. Our current efforts on adaptive workflow research are presented with emphasis laid on human involvement. The developments are based on dynamic composition of workflow resources, including workflow models,...

Consider cotangent bundles of exotic spheres, with their canonical symplectic structure. They admit automorphisms which preserve the part at infinity of one fibre, and which are analogous to the square of a Dehn twist. Pursuing that analogy, we show that they have infinite order up to isotopy (inside the group of all automorphisms with the same behaviour).

For any knot T transverse to a given contact structure on a 3-manifold, we exhibit a Legendrian two-component link L = L1 t L2 such that T equals the transverse push-off of L1 and contact (+1)surgery on L has the same effect as a Lutz twist along T .

There is an ongoing debate in the workflow community about the relative merits of Petri nets and π-calculus for workflow modeling. Recently, van der Aalst presented some challenges to model workflow in π-calculus. This paper responds to those challenges by showing how to code the 20 most commonplace workflow patterns in CCS (a subset of π-calculus), and describes two new workflow patterns that ...

Business processes are crucial for every organisation as they represent the core value generating processes. Managing business processes is important to be efficient and to compete with a globalized market. Business process monitoring is an essential means to understand and to improve working procedures. It helps detecting deviations from planned procedures and brings transparency into the stat...

A nite set of generators for the mapping class group of a punctured nonorientable surface is given. When the surface has at least two punctures, up to conjugates there are four generators; a Dehn twist about a two-sided nonseparating simple closed curve, a crosscap slide, a boundary slide and an elementary braid.

The Workflow Management System AltaVista Works has been extended to be able to process workflows in a distributed, partly even parallel manner. Build-time data are replicated over all participating workflow servers. The distribution of workflow execution is based on migration. Instead of the usual, static pre-partitioning, highly dynamic management of distribution is applied.