Bernd Freisleben - Academia.edu (original) (raw)

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Papers by Bernd Freisleben

Elsevier eBooks, 1987

In this paper it is argued that suitable operating systems support can be beneficial for modellin... more In this paper it is argued that suitable operating systems support can be beneficial for modelling the interaction between human users and the computing system. The proposed solution is based on a consequent use of the object model and the availibility of lightweight processes. The flexibility of our approach is demonstrated by several examples.

Presents a neural network that is intended to support airline marketing specialists in controllin... more Presents a neural network that is intended to support airline marketing specialists in controlling seat allocations on flight departures. The focus of the investigation is the prediction of overbooking rates in order to avoid a situation where an aircraft departs with empty seats when passengers who have booked seat do not participate in the flight. The neural network proposed to solve the problem is an extension of the forward-only counterpropagation model. The network learns to approximate the mapping between the input data (the number of booked seats for each reservation class at distinct time periods prior to departure) and the desired output (the number of no-shows). The trained network is then used to make the predictions for the future. The feasibility of this approach is demonstrated by an efficient implementation

Abstract The authors present an approach to a controller design that enables a simulated car to d... more Abstract The authors present an approach to a controller design that enables a simulated car to drive autonomously around a race track. The input to the controller is the current speed of the car and several sensor signals indicating the properties of the race track, and ...

Lecture Notes in Computer Science, 1997

Without Abstract

Genetic algorithms and fuzzy logic have been proven to be effective in a variety of control appli... more Genetic algorithms and fuzzy logic have been proven to be effective in a variety of control applications. We present an approach for automatically determining the control parameters of a machine used in a manufacturing environment for producing cookies and other pastry. The proposed solution is based on augmenting a genetic algorithm with elements of fuzzy logic, since either of them alone could not produce satisfactory results. The feasibility of the approach is demonstrated by presenting experimental results obtained in a series of test productions. The tests show that high quality cookies can be produced in a very short time

Springer eBooks, 1993

In this paper we investigate the issues involved in providing reliability and availability in a p... more In this paper we investigate the issues involved in providing reliability and availability in a persistent object store based on a distributed virtual memory architecture. Since in this environment all objects, regardless of their sizes and lifetimes, reside in a large, network-wide single-level store and are uniformly accessed via a remote paging protocol, it is important that the persistent store is always in a consistent state. The concurrency of conflicting operations on objects and failures such as node, disk or network crashes threaten the integrity of information contained in the store. The main focus of our work is to architecturally support replication mechanisms at the virtual memory level in order to achieve reliability and availability for all objects in the system. Our solution to the problem of maintaining the mutual consistency of replicated objects is based on a page coherence scheme for synchronizing access to replicas combined with a voting-based checkpointing protocol for ensuring their integrity in the presence of failures. It will be shown how to implement the proposed approach in a network of MONADS-PCs.

Springer eBooks, 1987

Dieser Beitrag beschreibt ein neues Kommunikationskonzept fur verteilte Rechnersysteme, bei dem d... more Dieser Beitrag beschreibt ein neues Kommunikationskonzept fur verteilte Rechnersysteme, bei dem der Informationsaustausch zwischen Prozessen auf sogenannten attributierten Kanalen basiert. Diese konnen eingesetzt werden, um die unterschiedlichen Anforderungen einer Vielzahl von Kommunikationsanwendungen in flexibler Weise zu unterstutzen. Die Verwendung des Konzeptes wird an einigen Beispielen demonstriert, auf eine mogliche Realisierung wird ebenfalls eingegangen.

Lecture Notes in Computer Science, 1993

In this paper we evaluate and compare the performance of self-organizing neural networks applied ... more In this paper we evaluate and compare the performance of self-organizing neural networks applied to the task of image compression. The networks investigated are two-layered architectures with linear neurons, and variants of Hebbian learning rules are used to reduce the dimensionality of the inputs while preserving a maximum of information in the output units. Although in theory all networks considered

Informatik-Fachberichte, 1991

Die zunehmende Nutzung der Kommunikationsdienste von Rechnernetzen hat nicht nur quantitative, so... more Die zunehmende Nutzung der Kommunikationsdienste von Rechnernetzen hat nicht nur quantitative, sondern auch qualitative Auswirkungen auf die Strukturen der Arbeitsorganisation. In diesem Beitrag werden die Ergebnisse eines interdisziplinaren Forschungsprojektes zwischen Informatikern und Psychologen vorgestellt, dessen Zielsetzung die Analyse des Einflusses von Computerkonferenzen auf das Entscheidungs- und Problemloseverhalten innerhalb einer Gruppe ist. Anhand einer experimentellen Untersuchung, an der insgesamt 12 Gruppen mit jeweils 5 Testpersonen teilnahmen, werden die Unterschiede der aus einer personlichen Sitzung und einer Computerkonferenz resultierenden Entscheidungsprozesse aufgezeigt.

Berichte des German Chapter of the ACM, 1991

In dieser Arbeit wird im Rahmen eines interdisziplinaren Forschungsprojektes zwischen Informatike... more In dieser Arbeit wird im Rahmen eines interdisziplinaren Forschungsprojektes zwischen Informatikern und Organisationspsychologen untersucht, wie sich das Problemlose- und Entscheidungsverhalten einer Gruppe in einer personlichen Sitzung von dem in einer Computeikonferenz unterscheidet. Die Grundlage der Untersuchung bildet ein an der TH Darmstadt im Zeitraum Mai 1990 bis November 1990 durchgefuhrtes Experiment, an dem mehrere Gruppen von Versuchspersonen teilnahmen und zwei Entscheidungsfalle unter verschiedenen Medienbedingungen gemeinsam zu losen hatten.

Springer eBooks, 1990

Persistent objects are a powerful modeling tool for the design and implementation of complex soft... more Persistent objects are a powerful modeling tool for the design and implementation of complex software systems. Scope, lifetime, and sharing are orthogonal concepts applicable to any type of object. In order to maintain the integrity of important objects and to improve the overall system reliability, the transaction mechanism can successfully be applied to a persistent object system. This paper discusses several alternatives for the realization of transactions in such an environment. It also presents new techniques for object-oriented concurrency control and recovery, based on the notion of layered transactions.

2010 Sixth IEEE International Conference on e-Science Workshops, 2010

Workshop on Neural Network Applications and Tools, 1993

In this paper, a neural network approach for classifying given spatial patterns into fractals or ... more In this paper, a neural network approach for classifying given spatial patterns into fractals or non-fractals as presented. The proposed network is a hierarchically organized, multi-layer feedforward architecture which exploits the structural properties of artificially generated fractals. The backpropagation algorithm is employed for training the network. The network is implemented in parallel on a multi-transputer system. It is able to classify all non-noisy test patterns correctly; fractal patterns where 1/ f and random noise are added take longer for the network to converge, but up to a certain signal-to-noise ratio they are also classified correctly.

Medienumbrüche, 2009

Digital tools are increasingly used in media studies, opening up new perspectives for research an... more Digital tools are increasingly used in media studies, opening up new perspectives for research and analysis, while creating new problems at the same time. In this volume, international media scholars and computer scientists present their projects, varying from powerful film-historical databases to automatic video analysis software, discussing their application of digital tools and reporting on their results. This book is the first publication of its kind and a helpful guide to both media scholars and computer scientists who intend to use digital tools in their research, providing information on applications, standards, and problems.

Proceedings of 1995 IEEE International Conference on Evolutionary Computation

[Proceedings 1993] Second IEEE International Conference on Fuzzy Systems

[1993] Proceedings of the Twenty-sixth Hawaii International Conference on System Sciences