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Pawlaszczyk, Dirk; Straßburger, Steffen
Scalability in distributed simulations of agent-based models. - In: Proceedings of the 2009 Winter Simulation Conference (WSC), ISBN 978-1-4244-5771-7, (2009), S. 1189-1200

Research on systems of autonomous agents, called multiagent systems (MAS), has received much interest in the domain of (distributed) artificial intelligence in recent years. MAS are most suitable for the development of distributed applications within an uncertain and dynamically changing environment. For validation of such systems agent based simulation is a new modeling paradigm not limited to systems which qualify as MAS by default. The focus of the work presented here is on scalability aspects of simulation environments for agent based simulations. Scalable solutions are required, as complex models require the capability to simulate hundreds or more complex deliberative agents. This is a capability which is often lacking in existing simulation environments for agents. We investigate different aspects which influence scalability and present a solution for enabling a scalable and efficient distributed simulation of agent-based models based on an adapted optimistic synchronization protocol which limits the level of optimism by using knowledge about agent interaction patterns.



http://dx.doi.org/10.1109/WSC.2009.5429429
Pawlaszczyk, Dirk; Straßburger, Steffen;
A synchronization protocol for distributed agent-based simulations with constrained optimism. - Online-Ressource (PDF-Datei: 5 S., 1,28 MB)Druckausg.: Modelling and simulation 2009 : the European Simulation and Modelling Conference 2009, ESM 2009 ; October 26 - 28, 2009, Leicester, United Kingdom / [organised by ETI - the European Technology Institute. Sponsored by EUROSIS, the Euopean Simulation Society]. Ed. by Marwan Al-Akaida. - Ostend : EUROSIS-ETI, 2009. - ISBN 978-90-77381-52-6, S. 337-341

Agent-based simulation (ABS) is a paradigm which has received much attention within the last years. For enabling industrial use of ABS scalable solutions are required which can be executed on a distributed computing architecture. Such solutions must be capable of simulating complex models with hundreds or more complex deliberative agents with really autonomous behavior. In this article we argue that only optimistic synchronization protocols are potentially capable of providing the required performance. We suggest a synchronization protocol with constrained optimism which exploits specific characteristics of communication patterns within agent based simulations. Furthermore the presented protocol includes appropriate methods for GVT computation and fossil collection in distributed ABS as well as mechanisms to ensure repeatability.



http://www.db-thueringen.de/servlets/DocumentServlet?id=15078
Straßburger, Steffen; Schulze, Thomas; Fujimoto, Richard
Future trends in distributed simulation and distributed virtual environments. - In: Advancing the frontiers of simulation, (2009), S. 231-261

This paper reports the main results of a peer study on future trends in distributed simulation and distributed virtual environments. The peer study was based on the opinions of more than 60 experts which were collected by means of a survey and personal interviews. The survey collected opinions concerning the current state-of-the-art, relevance, and research challenges that must be addressed to advance and strengthen these technologies to a level where they are ready to be applied in day-to-day business in industry. The most important result of this study is the observation that as research areas, both distributed simulation and distributed virtual environments are attributed a high future practical relevance and a high economic potential. At the same time the study shows that the current adoption of these technologies in the industrial sector is rather low. The study analyzes reasons for this observation and identifies open research challenges.



Pawlaszczyk, Dirk;
Skalierbare agentenbasierte Simulation : Werkzeuge und Techniken zur verteilten Simulation agentenbasierter Modelle. - Ilmenau : Univ.-Verl. Ilmenau, 2009. - Online-Ressource (PDF-Datei: XV, 327 S., 5,37 MB) : Ilmenau, Techn. Univ., Diss., 2009
Parallel als Druckausg. erschienen

Simulation stellt eine Analysemethode für viele Anwendungsbereiche zur Verfügung. Im Mittelpunkt der vorliegenden Arbeit steht eine spezielle Simulationsmethode - die Agentenbasierte Simulation (ABS). Im Rahmen der ABS werden Modelle betrachtet, die sich aus Agenten zusammensetzen. Agenten sind in der Lage, ihre Umgebung wahrzunehmen und unter Rückgriff auf lokal hinterlegtes Wissen, Schlüsse über ihre Wahrnehmungen ziehen. Darauf aufbauend wählt ein Agent Aktionen aus, mit denen er seine Umwelt gezielt verändern kann. Neben ihrer Autonomie sind Software-Agenten häufig durch soziale Eigenschaften charakterisiert und der Fähigkeit benachbarte Systeme zu erkennen und mit diesen zu kommunizieren. Agentenbasierte Simulation erlaubt es, das Verhalten komplexer Systeme sowie emergente Phänomene zu studieren. Die Komplexität der mittels Agententechnologie zu lösenden Problemstellungen und die Größe der zu simulierenden Modelle nehmen stetig zu. Auf der anderen Seite wird der Entwicklung von Werkzeugen zur effizienten Durchführung von agentenbasierten Simulationsexperimenten bisher vergleichsweise wenig Beachtung geschenkt. Die verteilte Simulation versucht, unabhängige Ereignisse nebenläufig auszuführen, um so die Simulationsexperimente zu beschleunigen und die Effizienz zu verbessern. Die Ansätze der verteilten Simulation sind jedoch vielfältig. Die Auswahl des richtigen Verfahrens fällt schwer. Die vorliegende Dissertation diskutiert Strategien zur Parallelisierung agentenbasierter Simulation. Ziel der Arbeit ist es, Chancen und Risiken die durch die Verteilung von Agentenmodellen entstehen näher zu untersuchen. Insbesondere werden Möglichkeiten sowie Grenzen der Skalierung dieser Anwendungsklasse analysiert. Hierfür wird zunächst der Begriff der Skalierbarkeit eingeführt. Mit ihrer Hilfe ist es möglich, Aussagen über die Effizienz eines verteilten Systems zu treffen. Die Entwicklung und Erprobung neuer sowie die Untersuchung bestehender Verfahren für die verteilte Simulation und deren Übertragung auf den Bereich der agentenbasierten Simulation bilden weitere Schwerpunkte der Arbeit.



http://nbn-resolving.de/urn:nbn:de:gbv:ilm1-2009000177
Munkelt, Torsten;
Potenzial Bayesâscher Netze zur Unterstützung der Produktionsplanung und -steuerung, 2008. - Online-Ressource (PDF-Datei: XXIV, 347 S., 5,71 MB) Ilmenau : Techn. Univ., Diss., 2008

Das Potenzial Bayes'scher Netze (BNe) zur Unterstützung der Produktionsplanung und -steuerung (PPS) wird identifiziert, untersucht und aufgezeigt - sowohl theoretisch als auch praktisch. Der theoretisch geprägte Teil stellt dar, dass sich BNe aufgrund ihrer Eigenschaften und Fähigkeiten besonders gut zur Lösung bestimmter Probleme der PPS eignen. Zudem stellt er BNe alternativen Verfahren zur Unterstützung der PPS gegenüber. Der praxisorientierte Teil untermauert die Erkenntnisse aus der Theorie. Ein Softwaresystem zur Wissensverarbeitung mittels BNe wird entworfen und implementiert. Es werden geeignete Probleme der PPS ausgewählt, konkretisiert und mittels des Softwaresystems gelöst. Die Auswertung und Interpretation der Ergebnisse der Experimente gipfelt in der Aussage, dass BNe ein Potenzial zur Unterstützung der PPS aufweisen und dass sich BNe sehr gut zur Lösung bestimmter Probleme der PPS eignen.



http://www.db-thueringen.de/servlets/DocumentServlet?id=14509
Taylor, Simon J. E.; Straßburger, Steffen; Straßburger, Steffen *1973-*; Turner, Stephen J.
The SISO CSPI PDG standard for COTS simulation package interoperability reference models. - Online-Ressource (PDF-Datei: 10 S., 103,2 KB)Druckausg.: SISO European Simulation Interoperability Workshop : EURO SIW 2008, held 16 - 19 June 2008. Edinburgh, Scotland. - Red Hook, NY : Curran, 2008. - S. 118-127. - ISBN 978-1-605-60200-4

http://www.db-thueringen.de/servlets/DocumentServlet?id=12350
Raab, Michael; Schulze, Thomas; Schulze, Thomas *1950-*; Straßburger, Steffen;
Experiences from the application of HLA-based distributed simulations in the production of vehicles. - Online-Ressource (PDF-Datei: 6 S., 281,8 KB)Druckausg.: HMS 2008 : the 11th [i.e. 10th] International Workshop on Harbor Maritime Multimodal Logistics Modeling & Simulation ; September 17 - 19, 2008, Campora S. Giovanni (Amantea, CS), Italy ; [part of the International Mediterranean and Latin American Modeling Multiconference, I3M 2008] / ed. by Agostino Bruzzone ... - Genova : Univ., 2008. - ISBN 978-88-903724-2-1. - S. 29-34

This article discusses the application of distributed simulation in the context of vehicle production planning. The experiences are derived from a real industrial project which aimed at connecting up to seven individually developed simulation models. The article reports on lessons learned which include the need for efficient ways to manage and control HLA-based distributed federations, to maintain a single code base for the models as well as lookahead considerations for synchronization.



http://www.db-thueringen.de/servlets/DocumentServlet?id=12349
Raab, Michael; Schulze, Thomas; Straßburger, Steffen
Management of HLA-based distributed legacy SLX-models. - In: Winter Simulation Conference, 2008, ISBN 978-1-4244-2707-9, (2008), S. 1086-1093

This article discusses management tasks that have to be supported for an efficient reuse of simulation models within HLA-based distributed simulation environments. After a review of the controversial discussions on the deployment of distributed simulation in the industrial domain, this article derives the need of support for such basic management tasks. Based on the practical experiences from an industrial project from the manufacturing domain, in which several legacy SLX models had to be integrated, we demonstrate how these management tasks have been supported and which tools were needed for this purpose. We furthermore discuss the results of the distributed simulation and show the necessity and the added benefit provided through its usage in industry.



http://dx.doi.org/10.1109/WSC.2008.4736177
Taylor, Simon J. E.; Turner, Stephen J.; Straßburger, Steffen
Guidelines for commercial off-the-shelf simulation package interoperability. - In: Winter Simulation Conference, 2008, ISBN 978-1-4244-2707-9, (2008), S. 193-204

Commercial-off-the-shelf (COTS) Simulation Packages (CSPs) are widely used visual interactive modeling environments such as Arena, Anylogic, Flexsim, Simul8, Witness, etc. CSP Interoperability (or distributed simulation) is a technique that allows a simulation to be executed over several computers or for several simulations running on different computers to run together. This also relates to simulation languages such as SLX and GPSS/H. There have been various attempts to interoperate these CSPs, some with the IEEE 1516 High Level Architecture (HLA). These can be quite complex and it is easy to loose track of exactly what is occurring between interoperating CSPs and their models. This paper introduces a set of Interoperability Reference Models (IRMs), or design patters for CSP Interoperability, that can be used as guidelines to simplify the interoperability process.



http://dx.doi.org/10.1109/WSC.2008.4736068
Straßburger, Steffen; Schulze, Thomas; Fujimoto, Richard
Future trends in distributed simulation and distributed virtual environments: results of a peer study. - In: Winter Simulation Conference, 2008, ISBN 978-1-4244-2707-9, (2008), S. 777-785

This paper reports main results of a peer study on future trends in distributed simulation and distributed virtual environments. The peer study was based on the opinions of more than 60 experts which were collected by means of a survey and personal interviews. The survey collected opinions concerning the current state-of-the-art, relevance, and research challenges that must be addressed to advance and strengthen these technologies to a level where they are ready to be applied in day-to-day business in industry. Most important result of this study is the observation that as research areas, both distributed simulation and distributed virtual environments are attributed a high future practical relevance and a high economic potential. At the same time the study shows that the current adoption of these technologies in the industrial sector is rather low. The study analyses reasons for this observation and identifies open research challenges.



http://dx.doi.org/10.1109/WSC.2008.4736140