Learn More
We examine 20-yr data sets of seismic activity from 10 volcanic areas in the western United States for annual periodic signals (seasonality), focusing on large calderas (Long Valley caldera and Yellowstone) and stratovolcanoes (Cascade Range). We apply several statistical methods to test for seasonality in the seismic catalogs. In 4 of the 10 regions,(More)
This paper presents an approach for using process knowledge in addition to structural knowledge for plant-wide diagnosis. System diagnosis based on fault-detection and fault-diagnosis often uses structural knowledge (e.g. hierarchies of subsystems and components) to identify the root cause of faults and malfunctions. The structural knowledge describes the(More)
In the domain of process automation there exist two upcoming standards for the modeling of plant data, namely ISO 15926 and IEC 62424 (CAEX). Both standards' objective is to describe the plant over the whole lifecycle. Within this contribution both standards will be compared. By using an example application of the automation domain, i.e. a belt conveyor,(More)
This paper describes an improvement of the engineering process of automated plants by combining information of the technical process and plant structure. Integrating a semi-formal process description in MS Visio ® for the requirements engineering phases and using these planning results throughout the engineering process can be an approach for an integrated(More)
Process alarm management systems alert the operator when normal operation limits are exceeded. Single disturbances can lead to an abundance of consequent alarm messages, and the alarm messages may overload the user by presenting many redundant alarms. This unwanted situation is called an alarm flood. The aim of the work presented in the paper is to reduce(More)
  • 1