We present a ̄exible framework that enables work ̄ow systems to adapt to changing conditions. The model is designed to reveal key aspects of the tasks involved in representing and enacting business processes. These fundamental characteristics are identi®ed as state, behaviour, distribution, coordination and enactment. By isolating such core concepts in a way that allows them to be varied, we ope...

This paper presents an eecient algorithm for solving the xpoints that arise in complex program analysis based on abstract interpretation. The algorithm behaves like those based upon interval analysis of a ow graph, but without requiring the ow graph to be given a priori. In the general case, the structure of the x-point computation is not known prior to analysis. In the algorithm, the entailmen...

This paper presents a numerical study of the 3D ow around a cylinder which was de ned as a benchmark problem for the steady state Navier–Stokes equations within the DFG high-priority research program ow simulation with high-performance computers by Sch afer and Turek (Vol. 52, Vieweg: Braunschweig, 1996). The rst part of the study is a comparison of several nite element discretizations with res...

The treatment of stream lines path lines and streak lines is a powerful method for visualizing the behavior of unsteady i e time dependent ow elds Although a closed parametric form of these lines does not exist we show how to compute their curvatures The visualiza tion of the curvatures of these curves shows several aspects of the ow such as location and movement of turbulent areas The techniqu...

We study budget constrained network upgradeable problems. We are given an undirected edge weighted graph G = (V,E) where the weight an edge e ∈ E can be upgraded for a cost c(e). Given a budget B for improvement, the goal is to find a subset of edges to be upgraded so that the resulting network is optimum for B. The results obtained in this paper include the following. 1. Maximum Weight Constra...

In controlling manipulators interacting with the external environment, an important issue is the choice and construction of the Cartesian level control system. To eeec-tively control the constrained manipulators, a knowledge of the resulting compliance of the system is required. In this paper a systematic analysis of the Cartesian stii-ness and compliance matrices, which at full extent has not ...

Background: Aflatoxins (AFs) are the most prevalent carcinogenic mycotoxins, produced mainly by Aspergillus flavus and A. parasiticus. The general purpose of the present study was to use Dehydroacetic Acid (DHA) and Ozonated Water (OW) to control A. flavus growth and accumulation of Aflatoxin B1 (AFB1) in Iranian pistachios. Methods: Three treatment pistachio groups were separately immersed ...

We address several aspects related to managing re-entrant lines in an uniied manner { capacity allocation, inventory management and production control { in a set of three papers. Our approach to study these systems is through simulation based optimization. Simulation ooers the exibility to model the complexities adequately while the gradient computation (via Innnitesimal Perturbation Analysis) ...