88,337 research outputs found
On Secure Workflow Decentralisation on the Internet
Decentralised workflow management systems are a new research area, where most
work to-date has focused on the system's overall architecture. As little
attention has been given to the security aspects in such systems, we follow a
security driven approach, and consider, from the perspective of available
security building blocks, how security can be implemented and what new
opportunities are presented when empowering the decentralised environment with
modern distributed security protocols. Our research is motivated by a more
general question of how to combine the positive enablers that email exchange
enjoys, with the general benefits of workflow systems, and more specifically
with the benefits that can be introduced in a decentralised environment. This
aims to equip email users with a set of tools to manage the semantics of a
message exchange, contents, participants and their roles in the exchange in an
environment that provides inherent assurances of security and privacy. This
work is based on a survey of contemporary distributed security protocols, and
considers how these protocols could be used in implementing a distributed
workflow management system with decentralised control . We review a set of
these protocols, focusing on the required message sequences in reviewing the
protocols, and discuss how these security protocols provide the foundations for
implementing core control-flow, data, and resource patterns in a distributed
workflow environment
On the satisfiability of constraints in workflow systems
Separation of duty and binding of duty in workflow systems is an
important area of current research in computer security. We
introduce a formal model for constrained workflow systems that
incorporate constraints for implementing such policies. We define an
entailment constraint, which is defined on a pair of tasks in a work
flow, and show that such constraints can be used to model many
familiar authorization policies. We show that a set of entailment
constraints can be manipulated algebraically in order to compute all
possible dependencies between tasks in the workflow. The resulting
set of constraints form the basis for an analysis of the
satisfiability of a workflow. We briefly consider how this analysis
can be used to implement a reference monitor for workflow systems
The BWS Open Business Enterprise System Architecture
Business process management systems play a central role in supporting the business operations of medium and large organizations. This paper analyses the properties current business enterprise systems and proposes a new application type called Open Business Enterprise Sys-tem. A new open system architecture called Business Workflow System is proposed. This ar-chitecture combines the instruments for flexible data management, business process manage-ment and integration into a flexible system able to manage modern business operations. The architecture was validated by implementing it into the DocuMentor platform used by major companies in Romania and US. These implementations offered the necessary data to create and refine an enterprise integration methodology called DM-CPI. The final section of the paper presents the concepts, stages and techniques employed by the methodology.BWL, Workflow, BWS, Evaluation, Open Business Enterprise System, DM-CPI
How Do Pharmacies Evaluate Cleanroom Automation Systems?
Many pharmacies have implemented or considered implementing cleanroom automation or compounding systems. Intravenous (IV) admixture automation is one of the newest areas of technology that has been applied to pharmacy workflow. Manufacturers tout systems for reducing errors reaching patients. Clinical literature supports that cleanroom technology can aid in patient safety
An environment for workflow applications on wide-area distributed systems
©2001 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.Workflow techniques are emerging as an important approach for the specification and management of complex processing tasks. This approach is especially powerful for utilising distributed data and processing resources in widely-distributed heterogeneous systems. We describe our DISCWorld distributed workflow environment for composing complex processing chains, which are specified as a directed acyclic graph of operators. Users of our system can formulate processing chains using either graphical or scripting tools. We have deployed our system for image processing applications and decision support systems. We describe the technologies we have developed to enable the execution of these processing chains across wide-area computing systems. In particular, we present our Distributed Job Placement Language (based on XML) and various Java interface approaches we have developed for implementing the workflow metaphor. We outline a number of key issues for implementing a high-performance, reliable, distributed workflow management system.James, H.A.; Hawick, K.A.; Coddington, P.D
Systematic investigation of methods for multiple freeform optimization in multi-lens imaging systems
With the development in freeform technology, it has now become more and more
feasible to use freeform surfaces in real system designs. While the freeform
surfaces helping optical designers achieve more and more challenging system
features, the methods for multiple freeform implementations are still
underdeveloped. We therefore investigate strategies to use freeform surfaces
properly in imaging optical systems with one Scheimpflug system and one
lithographic system. Based on the studies of the influences of the freeform
normalization radius, freeform order and system eccentricity, the methods of
determining the optimal location for implementing one freeform surface are
discussed. Different optimization strategies to optimize two freeform surfaces
are discussed to compare their resulting influences on the system performance.
On top of that, ways to implement more than one freeform surface in the optical
system is also investigated. In the end, a workflow is presented as guidance
for implementing multiple freeform surfaces with respect to system aberration
constitutions
- …