TY - CHAP A1 - Braun, Sebastian A1 - Cheng, Chi-Tsun A1 - Dowey, Steve A1 - Wollert, Jörg T1 - Survey on Security Concepts to Adapt Flexible Manufacturing and Operations Management based upon Multi-Agent Systems T2 - 2020 IEEE 29th International Symposium on Industrial Electronics (ISIE), Proceedings N2 - The increasing digitalization brings new opportunities but also puts new challenges to modern industrial systems. Software agents are one of the key technologies towards self-optimizing factories and are currently used to address the needs of cyber-physical production systems (CPPS). However their interplay in industrial settings needs to be understood better.This paper focusses on securing a cloud infrastructure for multi-agent systems for industrial sites. An industrial site contains multiple production processes that need to communicate with each other and each physical resource is abstracted with a software agent. This volatile architecture needs to be managed and protected from manipulation. The proposed infrastructure presents a security concept for TCP/IP communication between agents, machines, and external networks. It is based on open-source software and tested on a three-node edge cloud controlling a model-plant. Y1 - 2020 U6 - https://doi.org/10.1109/ISIE45063.2020.9152210 N1 - 2020 IEEE 29th International Symposium on Industrial Electronics (ISIE), 17 - 19 June, 2020, Delft, Netherlands PB - IEEE CY - New York, NY ER - TY - JOUR A1 - Braun, Sebastian A1 - Cheng, Chi-Tsun A1 - Dowey, Steve A1 - Wollert, Jörg T1 - Performance evaluation of skill-based order-assignment in production environments with multi-agent systems JF - IEEE Journal of Emerging and Selected Topics in Industrial Electronics N2 - The fourth industrial revolution introduces disruptive technologies to production environments. One of these technologies are multi-agent systems (MASs), where agents virtualize machines. However, the agent's actual performances in production environments can hardly be estimated as most research has been focusing on isolated projects and specific scenarios. We address this gap by implementing a highly connected and configurable reference model with quantifiable key performance indicators (KPIs) for production scheduling and routing in single-piece workflows. Furthermore, we propose an algorithm to optimize the search of extrema in highly connected distributed systems. The benefits, limits, and drawbacks of MASs and their performances are evaluated extensively by event-based simulations against the introduced model, which acts as a benchmark. Even though the performance of the proposed MAS is, on average, slightly lower than the reference system, the increased flexibility allows it to find new solutions and deliver improved factory-planning outcomes. Our MAS shows an emerging behavior by using flexible production techniques to correct errors and compensate for bottlenecks. This increased flexibility offers substantial improvement potential. The general model in this paper allows the transfer of the results to estimate real systems or other models. KW - cyber-physical production systems KW - event-based simulation KW - multi-agent systems KW - digital factory KW - industrial agents Y1 - 2021 U6 - https://doi.org/10.1109/JESTIE.2021.3108524 SN - 2687-9735 IS - Early Access PB - IEEE CY - New York ER - TY - CHAP A1 - Beer, Stefan A1 - Haidn, O.J. A1 - Willms, Herbert ED - Carvalho, Maria da Graça T1 - Control of stoichiometric propellant supply in an H2/O2-spinning reserve system T2 - Combustion technologies for a clean environment : selected papers from the proceedings of the first international conference, Vilamoura, Portugal, September 3 - 6, 1991. - (Energy, combustion and the environment ;1) Y1 - 1995 SN - 2-88124-619-2 SP - 825 EP - 838 PB - Gordon and Breach CY - Basel [u.a.] ER - TY - JOUR A1 - Beckenbach, Isabel A1 - Scheidweiler, Robert T1 - Perfect ƒ-Matchings and ƒ-Factors in Hypergraphs - A Combinatorial Approach JF - Discrete Mathematics N2 - We prove characterizations of the existence of perfect ƒ-matchings in uniform mengerian and perfect hypergraphs. Moreover, we investigate the ƒ-factor problem in balanced hypergraphs. For uniform balanced hypergraphs we prove two existence theorems with purely combinatorial arguments, whereas for non-uniform balanced hypergraphs we show that the ƒ-factor problem is NP-hard. Y1 - 2016 U6 - https://doi.org/10.1016/j.disc.2017.05.005 SN - 2192-7782 N1 - Als Volltext auch bei ZIB (Zuse Institute Berlin) VL - 240 IS - 10 SP - 2499 EP - 2506 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Anik, Sabri A1 - Kapoor, Madan Lal A1 - Frohberg, Martin G. T1 - Thermodynamic behaviour of oxygen in molten substitutional alloy solvents JF - Zeitschrift für Metallkunde Y1 - 1983 SN - 0044-3093 VL - 74 IS - 1 SP - 53 EP - 58 ER - TY - JOUR A1 - Anik, Sabri A1 - Frohberg, Martin G. A1 - Kapoor, Madan Lal T1 - Experiments and theoretical considerations on the solution of oxygen in binary metal alloys JF - Berichte der Bunsengesellschaft für physikalische Chemie Y1 - 1983 SN - 0005-9021 SN - 0940-483X VL - 87 IS - 12 SP - 1201 EP - 1204 ER - TY - JOUR A1 - Anik, Sabri A1 - Frohberg, Martin G. A1 - Kapoor, Madan Lal T1 - Prediction of thermodynamic properties of oxygen in binary metallic solvents JF - Zeitschrift für Metallkunde Y1 - 1983 SN - 0044-3093 VL - 74 IS - 6 SP - 372 EP - 375 ER - TY - JOUR A1 - Anik, Sabri A1 - Frohberg, Martin G. T1 - Thermodynamics and solubility of oxygen in liquid bismuth-lead and bismuth-antimony alloys JF - Berichte der Bunsengesellschaft für physikalische Chemie Y1 - 1987 SN - 0940-483X SN - 0005-9021 VL - 91 IS - 7 SP - 790 EP - 794 ER - TY - JOUR A1 - Anik, Sabri A1 - Frohberg, Martin G. T1 - Thermodynamics and solubility of oxygen in liquid copper-lead alloys at 1200°C from E.M.F. measurements JF - Berichte der Bunsengesellschaft für physikalische Chemie Y1 - 1984 SN - 0940-483X SN - 0005-9021 VL - 88 IS - 8 SP - 707 EP - 710 ER - TY - JOUR A1 - Anik, Sabri A1 - Frohberg, Martin G. T1 - Investigations of the thermodynamics of oxygen and the determination of the miscibility gap in the system copper-oxygen-lead at 12000C JF - Zeitschrift für Metallkunde Y1 - 1984 SN - 0044-3093 VL - 75 IS - 8 SP - 586 EP - 589 ER -