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As a standardized communication protocol, OPC UA is the main focal point with regard to information exchange in the ongoing initiative Industrie 4.0. But there are also considerations to use it within the Internet of Things. The fact that currently no open reference implementation can be used in research for free represents a major problem in this context.(More)
Representational state transfer (REST) is a wide-spread architecture style for decentralized applications. REST proposes the use of a fixed set of service interfaces to transfer heterogeneous resource representations instead of defining custom interfaces for individual applications. This paper explores the advantages of RESTful architectures, i.e.,(More)
A game-theoretic model for the study of dynamic networks is analyzed. The model is motivated by communication networks that are subject to failure of nodes and where the restoration needs resources. The corresponding two-player game is played between " Destructor " (who can delete nodes) and " Constructor " (who can restore or even create nodes under(More)
Describing procedures is essential for modeling and controlling technical processes. Although various procedure description methods are available from computer science, system theory and industrial automation, they are only partially suitable as a generic method for engineering automation procedures. In order to close this gap, we propose a procedure(More)
Automation of tedious engineering tasks allows for more efficient plant commissioning and reconfiguration. Usage of knowledge-based systems is one possibility to solve this challenge. We present a rule-based system that is based on declarative graph database queries which have the advantage of being comprehensible by both computer scientists and engineering(More)
Many tasks in factory automation can be solved with the bare knowledge of used and possible product flow paths in a plant. Unfortunately, the information about these is usually not available explicitly, but is distributed among different models and tools. We present a model that describes discrete product flow paths and aims to play a similarly important(More)