Trust in control: a trust model for power system network assessment

The question of whether a process variable transmitted from a device in the field to a power system control center is trustworthy is of high importance nowadays. Traditional bad data detection schemes have their limits in cases of elaborated cyberattacks and cascading failures in a system of systems such as a digitalized power system. This paper proposes a trust model designed for power system network assessment (PSNA). Different to other domains, where trust models already exist (e.g., OC-Trust for organic computing systems), the environment for PSNA is more centralized, and the focus lies on other facets than in organic computing due to the nature of the environment. Therefore, OC-Trust is tailored by categorizing its facets regarding their relevance for PSNA on the one hand. On the other hand, the trust model is extended to realize context-sensitive intersections of trust values. Furthermore, an example of an instantiation of the resulting PSNA-Trust model is given. Two security metrics and one credibility metric based on literature are presented as well as an equation for a context-sensitive intersection.

Organic Computing für Nacharbeit in Fließmontagen*/Organic computing for rework in flow assembly lines – Enhancing the efficiency of complex rework processes using an observer/controller-architecture

In der Fließmontage von Automobilen kommt es während der meist manuellen Montage gelegentlich zu Fehlern wie Beschädigungen an Kabelsteckern oder nicht korrekt montierten Bauteilen. Diese Fehler müssen möglichst innerhalb der Fließmontage behoben werden, um eine kostenintensive Nacharbeit am Fahrzeug in separaten Bereichen zu vermeiden. Dieser Beitrag zeigt, wie ein neuartiger Informatikansatz bei der Beherrschung dieser komplexen Aufgabe unterstützend wirken kann.   In flow lines for automobile assembly, defects like damaged cable connectors or incorrectly assembled components occur randomly due to the high amount of manual labor. These defects must be reworked as quickly as possible within the flow assembly to avoid additional rework on the product in separate areas. This article shows how an innovative approach in computer science can help to master this complex task.