436 research outputs found
Confusion Analysis and Detection for Workflow Nets
Option processes often occur in a business procedure with respect to resource competition. In a business procedure modeled with a workflow net (WF-net), all decision behavior and option operations for business tasks are modeled and performed by the conflicts in corresponding WF-net. Concurrency in WF-nets is applied to keep a high-performance operation of business procedures. However, the firing of concurrent transitions in a WF-net may lead to the disappearance of conflicts in the WF-net. The phenomenon is usually called confusions that produces difficulties for the resolution of conflicts. This paper investigates confusion detection problems in WF-nets. First, confusions are formalized as a class of marked subnets with special conflicting and concurrent features. Second, a detection approach based on the characteristics of confusion subnets and the integer linear programming (ILP) is developed, which is not required to compute the reachability graph of a WF-net. Examples of the confusion detection in WF-nets are presented. Finally, the impact of confusions on the properties of WF-nets is specified
Workshop on Modelling of Objects, Components, and Agents, Aarhus, Denmark, August 27-28, 2001
This booklet contains the proceedings of the workshop Modelling of Objects, Components, and Agents (MOCA'01), August 27-28, 2001. The workshop is organised by the CPN group at the Department of Computer Science, University of Aarhus, Denmark and the "Theoretical Foundations of Computer Science" Group at the University of Hamburg, Germany. The papers are also available in electronic form via the web pages: http://www.daimi.au.dk/CPnets/workshop01
Ninth Workshop and Tutorial on Practical Use of Coloured Petri Nets and the CPN Tools, Aarhus, Denmark, October 20-22, 2008
This booklet contains the proceedings of the Ninth Workshop on Practical Use of Coloured Petri Nets and the CPN Tools, October 20-22, 2008. The workshop is organised by the CPN group at the Department of Computer Science, University of Aarhus, Denmark. The papers are also available in electronic form via the web pages: http://www.daimi.au.dk/CPnets/workshop0
An approach to enacting business process models in support of the life cycle of integrated manufacturing systems
The complexity of enterprise engineering processes requires the application of
reference architectures as means of guiding the achievement of an adequate level of
business integration. This research aims to address important aspects of this
requirement by associating the formalism of reference architectures to various life cycle
phases of integrating manufacturing systems (IMS) and enabling their use in addressing
contemporary system engineering issues.
In pursuit of this aim, the following research activities were carried out: (1) to
devise a framework which supports key phases of the IMS life cycle and (2) to populate
part of this framework with an initial combination of architectures which can be
encapsulated into a computer-aided systems engineering environment. This has led to
the creation of a workbench capable of providing support for modelling, analysis,
simulation, rapid-prototyping, configuration and run-time operation of an IMS, based
on a consistent set of models associated with the engineering processes involved. The
research effort concentrated on selecting and investigating the use of appropriate
formalisms which underpin a selection of architectures and tools (i. e. CIM-OSA, Petrinets,
object-oriented methods and CIM-BIOSYS), this by designing, implementing,
applying and testing the workbench.
The main contribution of this research is to demonstrate that it is possible to
retain an adequate level of formalism, via computational structures and models, which
extend through the IMS life cycle from a conceptual description of the system through
to actions that the system performs when operating. The underlying methodology
which supported this contribution is based on enacting models of system behaviour
which encode important coordination aspects of manufacturing systems. The strategy
for demonstrating the incorporation of formalism to the IMS life cycle was to enable
the aggregation into a workbench of knowledge of 'what' the system is expected to
achieve (i. e. 'problems' to be addressed) and 'how' the system can achieve it (i. e
possible 'solutions'). Within the workbench, such a knowledge is represented through
an amalgamation of business process modelling and object-oriented modelling
approaches which, when adequately manipulated, can lead to business integration
Foundations of Multi-Paradigm Modelling for Cyber-Physical Systems
This open access book coherently gathers well-founded information on the fundamentals of and formalisms for modelling cyber-physical systems (CPS). Highlighting the cross-disciplinary nature of CPS modelling, it also serves as a bridge for anyone entering CPS from related areas of computer science or engineering. Truly complex, engineered systems—known as cyber-physical systems—that integrate physical, software, and network aspects are now on the rise. However, there is no unifying theory nor systematic design methods, techniques or tools for these systems. Individual (mechanical, electrical, network or software) engineering disciplines only offer partial solutions. A technique known as Multi-Paradigm Modelling has recently emerged suggesting to model every part and aspect of a system explicitly, at the most appropriate level(s) of abstraction, using the most appropriate modelling formalism(s), and then weaving the results together to form a representation of the system. If properly applied, it enables, among other global aspects, performance analysis, exhaustive simulation, and verification. This book is the first systematic attempt to bring together these formalisms for anyone starting in the field of CPS who seeks solid modelling foundations and a comprehensive introduction to the distinct existing techniques that are multi-paradigmatic. Though chiefly intended for master and post-graduate level students in computer science and engineering, it can also be used as a reference text for practitioners
Study applying simulation to improve a real production process in the context of Industry 4.0
During the thesis development, simulation theories and techniques will be applied to a part of the production process of an Italian manufacturing company. A simulation model of the steaming and washing phases will be developed to outline the automated and manual procedures that are performed in the AS-IS state. Several what-if scenarios will be then envisioned and simulated to analyze how the production activities could be re-engineered in the light of the new technological advancements, such as the introduction of full traceability
Quality of process modeling using BPMN: a model-driven approach
Dissertação para obtenção do Grau de Doutor em
Engenharia InformáticaContext: The BPMN 2.0 specification contains the rules regarding the correct usage of
the language’s constructs. Practitioners have also proposed best-practices for producing better BPMN models. However, those rules are expressed in natural language, yielding sometimes ambiguous interpretation, and therefore, flaws in produced BPMN models.
Objective: Ensuring the correctness of BPMN models is critical for the automation of
processes. Hence, errors in the BPMN models specification should be detected and
corrected at design time, since faults detected at latter stages of processes’ development can be more costly and hard to correct. So, we need to assess the quality of BPMN models in a rigorous and systematic way.
Method: We follow a model-driven approach for formalization and empirical validation
of BPMN well-formedness rules and BPMN measures for enhancing the quality of
BPMN models.
Results: The rule mining of BPMN specification, as well as recently published BPMN works, allowed the gathering of more than a hundred of BPMN well-formedness and
best-practices rules. Furthermore, we derived a set of BPMN measures aiming to provide information to process modelers regarding the correctness of BPMN models. Both BPMN rules, as well as BPMN measures were empirically validated through samples of
BPMN models.
Limitations: This work does not cover control-flow formal properties in BPMN models, since they were extensively discussed in other process modeling research works.
Conclusion: We intend to contribute for improving BPMN modeling tools, through the
formalization of well-formedness rules and BPMN measures to be incorporated in those
tools, in order to enhance the quality of process modeling outcomes
Process Mining Handbook
This is an open access book. This book comprises all the single courses given as part of the First Summer School on Process Mining, PMSS 2022, which was held in Aachen, Germany, during July 4-8, 2022. This volume contains 17 chapters organized into the following topical sections: Introduction; process discovery; conformance checking; data preprocessing; process enhancement and monitoring; assorted process mining topics; industrial perspective and applications; and closing
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