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  • 1.
    Andler, Sten F.
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Brohede, Marcus
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Information Fusion from Databases, Sensors and Simulations: Annual Report 20062007Rapport (Övrigt vetenskapligt)
  • 2.
    Andler, Sten F.
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Brohede, Marcus
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Information Fusion from Databases, Sensors and Simulations: Annual Report 20072008Rapport (Övrigt vetenskapligt)
  • 3.
    Andler, Sten F.
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Brohede, Marcus
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Information Fusion from Databases, Sensors and Simulations: Annual Report 20082009Rapport (Övrigt vetenskapligt)
  • 4.
    Andler, Sten F
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Brohede, Marcus
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Gustavsson, Sanny
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Mathiason, Gunnar
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    DeeDS NG: Architecture, Design, and Sample Application Scenario2007Ingår i: Handbook of Real-Time and Embedded Systems, CRC Press, 2007Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 5.
    Boström, Henrik
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Andler, Sten F.
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Brohede, Marcus
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Johansson, Ronnie
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Karlsson, Alexander
    Högskolan i Skövde, Institutionen för kommunikation och information.
    van Laere, Joeri
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Niklasson, Lars
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Nilsson, Marie
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Persson, Anne
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Ziemke, Tom
    Högskolan i Skövde, Institutionen för kommunikation och information.
    On the Definition of Information Fusion as a Field of Research2007Rapport (Övrigt vetenskapligt)
    Abstract [en]

    A more precise definition of the field of information fusion can be of benefit to researchers within the field, who may use uch a definition when motivating their own work and evaluating the contribution of others. Moreover, it can enable researchers and practitioners outside the field to more easily relate their own work to the field and more easily understand the scope of the techniques and methods developed in the field. Previous definitions of information fusion are reviewed from that perspective, including definitions of data and sensor fusion, and their appropriateness as definitions for the entire research field are discussed. Based on strengths and weaknesses of existing definitions, a novel definition is proposed, which is argued to effectively fulfill the requirements that can be put on a definition of information fusion as a field of research.

  • 6.
    Brohede, Marcus
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Bounded recovery in distributed discrete real-time simulations2006Rapport (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    This thesis proposal defines the problem of recovery in distributed discrete real-time simulations with external actions; real-time simulations with simulation actions in the real world. A problem that these simulations encounter is that they cannot rely on rollback-based recovery (use of checkpoints) for two reasons. First, some actions in the "real world" cannot be undone, and second, the time allowed for recovery tends to be short and bounded. As a result there is a need for some form of error masking for this category of simulations. We propose an infrastructure for these simulations with external actions based on an active distributed real-time database that features replication of the distributed simulation. The degree of replication is based on the dependability requirements of the individual nodes in the simulation.

    A guideline for how to decompose a distributed real-time simulation into parts with different requirements on the replication protocol is also defined as an interesting topic to investigate further. We introduce the simulation infrastructure "Simulation DeeDS" featuring a replication-based recovery strategy for the category of simulations mentioned. We also show that some information fusion applications are indeed examples of applications that need real-time simulation with external actions and as such can benefit from the proposed infrastructure.

  • 7.
    Brohede, Marcus
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Andler, Sten F
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    A Distributed Whiteboard Infrastructure for Information Fusion Simulations2009Ingår i: Proceedings of the 32nd Annual IEEE Software Engineering Workshop (SEW-32) / [ed] Breitman, K; Sterritt, R; Bohner, S, IEEE Computer Society Press , 2009, s. 134-142Konferensbidrag (Refereegranskat)
    Abstract [en]

    We argue that architecural ideas from DeeDS, a distributed real-time database, can be used to create a whiteboard infrastructure usable in information fusion applications as well as in fault tolerant simulations. We discuss the need for faulttolerant real-time simulation in information fusion, and how this can be supported by the whiteboard infrastructure. There are many reasons to perform real-time simulations (including environment simulation) - the use of real hardware or systems can be prohibitively expensive or dangerous to people and equipment, or may simply not be available at all. The combination of real and simulated objects, or nodes, is of particular interest when it is prohibitively expensive, dangerous, or impossible to test sufficient numbers of collaborating nodes in a realistic application. The need for fault tolerance of such real-time simulations, with a mixture of real and simulated nodes, occurs because it is difficult/impossible to restart physical nodes or wait for restart of simulated nodes, if one or more simulation instances fail. The key problem when mixing real and simulated nodes is the occurrence of "external actions" that cannot easily be undone and redone when a failure has occurred. We describe a natural approach to support multiple degrees of fault tolerance in realtime simulations, based on optimistic synchronization on top of a whiteboard architecture. The whiteboard architecture is a natural and useful infrastructure metaphor for information fusion, an information-based exchange that allows real and simulated nodes to be freely mixed.

  • 8.
    Brohede, Marcus
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Andler, Sten F.
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Using Distributed Active Real-Time Database Functionality in Information-Fusion Infrastructures2005Ingår i: RTiS 2005: proceedings of Real time in Sweden 2005, the 8th Biennial SNART Conference on Real-Time Systems / [ed] Sten F. Andler, Anton Cervin, Skövde: Skövde University , 2005, s. 5-10Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    We present a list of requirements that need to be

    addressed by an infrastructure for information fusion where

    applications have real-time requirements. The requirements are

    grouped into configuration requirements, temporal requirements,

    and robustness requirements. We show how the functionality of

    a distributed active real-time database system (DARTDBS) can

    meet many of the given requirements, and therefore, argue that

    it is suitable for use in an information-fusion infrastructure with

    real-time requirements. The design of a particular DARTDBS,

    the DeeDS architecture and prototype, is presented as proof

    of concept. A comparison with some alternative infrastructures

    is briefly discussed. We describe a small distributed real-time

    simulation experiment using DeeDS as infrastructure, and discuss

    open questions such as how to deal with uncertainty management

    of information sources, recovery of information fusion nodes, and

    harmonizing data structures from different information sources.

  • 9.
    Brohede, Marcus
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Andler, Sten F.
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Son, Sang Hyuk
    Department of Computer Science, University of Virginia, 151 Engineer’s Way, P.O. Box 400740, USA.
    Optimistic database-driven distributed real-time simulation (05F-SIW-031)2005Ingår i: Fall 2005 Simulation Interoperability Workshop: Fall SIW 2005, Curran Associates, Inc., 2005, s. 223-228Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper we present an optimistic synchronization protocol for distributed real-time simulations that uses a database as communication and storage mechanism. Each node in the simulation is also a database node and communication in the simulation is done by storing and reading to the database. The underlying replication protocol in the database then makes sure that all updates are propagated. The progress in the simulation is optimistic, i.e., each node tries to simulate as far ahead as possible without waiting for input from any other node. Since the simulations are said to be real-time we must guarantee that no events can be delivered too early nor too late. Also, recovery of a node must be done within predictable time due to the real-time constraints. Since all updates in the simulation are done through transactions we have a well-defined foundation for recovery and we show how the recovery can be done deterministically. For the simulation to function (and keep deadlines) during network partitions we allow local commits in the database. This requires that all data required on a specific node must be reachable from that node, i.e., no remote accesses should be needed. However, allowing local commits may introduce conflicting updates. These conflicts are detected and solved predictably

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