Dieses Buch enthält die Beiträge der 4. GI/ITG/GMA-Fachtagung über Fehlertolerierende Rechensysteme, die im September 1989 in einer Reihe von Tagungen in München 1982, Bonn 1984 sowie Bremerhaven 1987 veranstaltet wurde. Die 31 Beiträge, darunter 4 eingeladene, sind teils in deutscher, überwiegend aber in englischer Sprache verfa€t. Insgesamt wird durch diese Beiträge die Entwicklung der Konzeption und Implementierung fehlertoleranter Systeme in den letzten zwei Jahren vor allem in Europa dokumentiert. Sämtliche Beiträge berichten über neue Forschungs- oder Entwicklungsergebnisse.

Dieser Band enthält die 38 Beiträge der 3. GI/ITG/GMA-Fachtagung über "Fehlertolerierende Rechensysteme". Unter den 10 aus dem Ausland eingegangenen Beiträgen sind 4 eingeladene Vorträge. Insgesamt dokumentiert dieser Tagungsband die Entwicklung der Konzeption und Implementierung fehlertoleranter Systeme in den letzten drei Jahren vor allem in Europa. Sämtliche Beiträge sind neue Forschungs- oder Entwicklungsergebnisse, die vom Programmausschuß der Tagung aus 70 eingereichten Beiträgen ausgewählt wurden.

In the last decade of Computer Science development, we can observe a growing interest in fault-tolerant computing. This interest is the result of a rising number of appl'ications where reliable operation of computing systems is an essential requirement. Besides basic research in the field of fault-tolerant computing, there is an increasing num ber of systems especially designed to achieve fault-tolerance. It is the objective of this conference to offer a survey of present research and development activities in these areas. The second GI/NTG/GM~ Conference on Fault-Tolerant Computing Systems has had a preparatory time of about two years. In March 1982, the first GI conference concerning fault-tolerant computing systems was held in Munich. One of the results of the conference was to bring an organiza tional framework to the FTC community in Germany. This led to the founding of the common interest group "Fault-Tolerant Computing Systems" of the Gesellschaft fur Informatik (GI), the Nachrichtentechnische Gesellschaft (NTG), and the Gesellschaft fur MeB- und Regelungstechnik (VDI/VDE-GMR) in November 1982. At that time, it was also decided to schedule a biannual conference on fault-tolerant computing systems. One of the goals of this second conference is to strengthen the relations with the international FTC community; thus, the call for papers was extended not only to German-speaking countries, but to other countries as well.

5th International GI/ITG/GMA Conference, Nürnberg, September 25-27, 1991. Proceedings

Variational principles have proven to be surprisingly fertile. For example, Fermat used variational methods to demonstrate that light follows the fastest route from one point to another, an idea which came to be a cornerstone of geometrical optics. This book explains variational principles and charts their use throughout modern physics. It examines the analytical mechanics of Lagrange and Hamilton, the basic tools of any physicist. The book also offers simple but rich first impressions of Einstein’s General Relativity, Feynman’s Quantum Mechanics, and more that reveal amazing interconnections between various fields of physics.

The two-volume set LNAI 7094 and LNAI 7095 constitutes the refereed proceedings of the 10th Mexican International Conference on Artificial Intelligence, MICAI 2011, held in Puebla, Mexico, in November/December 2011. The 96 revised papers presented were carefully reviewed and selected from numerous submissions. The first volume includes 50 papers representing the current main topics of interest for the AI community and their applications. The papers are organized in the following topical sections: automated reasoning and multi-agent systems; problem solving and machine learning; natural language processing; robotics, planning and scheduling; and medical applications of artificial intelligence.

Software Diversity is one of the fault-tolerance means to achieve dependable systems. In this volume, some experimental systems as well as real-life applications of software diversity are presented. The history, the current state-of-the-art and future perspectives are given. Although this technique is used quite successfully in industrial applications, further research is necessary to solve some open questions. We hope to report on new results and applications in another volume of this series within some years. Acknowledgements The idea of the workshop was put forward by the chairpersons of IFIP WG lOA, J. -c. Laprie, J. F. Meyer and Y. Tohma, in January 1986, and the edi tor of this volume was asked to organize the workshop. This volume was edited with the assistance of the editors of the series, A. AviZienis, H. Kopetz and J. -C. Laprie, who also had the function of reviewers. Karlsruhe, October 1987 U. Voges, Editor Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1. Introduction U. Voges 2. Railway Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 ERICSSON Safety System for Railway Control . . . . . . . . . . . . . . . . . . 11 G. Hagelin 3. Nuclear Applications . . . . . . . . . . . . . . . . . . . . . . 23 Use of Diversity in Experimental Reactor Safety Systems . 29 U. Voges The PODS Diversity Experiment . 51 P. G. Bishop 4. Flight Applications . . . . . . . . . . . . . . . . . . . . . . . . . 85 AIRBUS and ATR System Architecture and Specification. . 95 P. Traverse 5. University Research . . . . . . . . . . . . . . . . . . . 105 Tolerating Software Design Faults in a Command and Control System . . . . . . . . . . . . . . . . . . . . . . 109 T. Anderson, P. A. Barrett, D. N. Halliwell, M. R. Moulding DEDIX 87 - A Supervisory System for Design Diversity Experiments at UCLA . . . . . . . . . . . . . . . . . .