CONTENTS & ABSTRACTS
InEnglish. Summaries in Estonian
Proceedings of the Estonian Academy of Sciences.
Engineering
Volume 11 No. 1March 2005
Challengesfor real-time systems engineering. Part 1: State of the art;3–17
Leo Mõtus, Robertus A. Vingerhoedsand Merik Meriste
Abstract. This two-part paper addresses characteristic properties oftime-critical software-intensive systems (e.g. embedded, real-time, remotemonitoring and diagnosis systems). These properties lie in the interfacebetween systems engineering and software engineering. The first part of thepaper pinpoints existing problems, the second one discusses potentialresolution routes. The first part starts from observations of the currentsystems development process with the focus on stages for specification ofrequirements and design. The key problem, in addition to the increase of theoverall complexity of systems, is the increasing role of emergent (e.g.non-predictable) system behaviour, its causes and methods for maintainingbetter control over the system emergent behaviour.
Key words: real-time systems,time-critical systems, proactive components, interactive computing.
Challengesfor real-time systems engineering. Part 2: Towards time-aware technology;18–30
Leo Motus, Robertus A. Vingerhoedsand Merik Meriste
Abstract. This part of the paper discusses evolution trends of thetheory and technology in time-aware interaction-centred models of computationand in time-aware multiagent systems that foster the emergence of amultidisciplinary environment, capable to support analysis of design decisionsat the early development stages of time-critical software-intensive systems.
Key words: real-time systems,time-critical systems, proactive components, interactive computing.
Usingagent and UML technologies in modelling organizations: the case of a vehicletheft; 31–45
Raul Savimaa
Abstract. The paper considers modelling the emergent behaviour of humanmultifunctional organizations. A combined modelling methodology is introducedthat unites UML, the Q-model and multi-agent approach. UML is used formodelling the processes, the Q-model for analysing timing characteristics andmulti-agent model for simulating interactions between actors. Although thisapproach needs further refinement, it can already be used for modelling thetime-dependent emergent behaviour in organizations. As an example, the case ofthe theft of a vehicle has been considered.
Key words: modelling of organizations, multi-agent systems, simulation,emergent behaviour, UML.
Onmicromechanical problems of erosive wear of particle reinforced composites;46–58
Irina Hussainova
Abstract. Particle reinforcedcomposites is a success story from the viewpoint of their numerousapplications. The main objective of this paper is to review the contributionsof solid mechanics research to the development of composite materials andstructures and to better understanding of the multiphase material behaviour ina tribological environment. The effect of microstructural features on the wearof multiphase materials is analysed for hard carbide particle reinforcedcomposites.
Key words: particle reinforcedcomposites, residual stress, micromechanics, wear.
Amethod for securing working mining block stability in Estonian oil shale mines;59–68
Jüri-Rivaldo Pastarus and Sergei Sabanov
Abstract. This paper deals with thestability analysis and design of working mining blocks in Estonian oil shalemines, where the room-and-pillar mining with blasting is used. The pillars arearranged in a singular grid. Calculations are performed using the concepts ofcritical area and conditional thickness, and the sliding rectangle method. Theresults are presented in the form of conditional thickness contours. Forpractical applications, the criterion of the conditional thickness differenceis used. It guarantees safety and minimal losses of the mining block. Themethod is applicable in different geological conditions, where theroom-and-pillar mining is used.
Key words: working miningblock, room-and-pillar mining, numerical modelling, stability, critical area,conditional thickness.
Therelative merits of EEG and MEG; 69–82
Jaakko Malmivuo
Abstract. After the first detection of the magnetoencephalogram, MEG, it wasbelieved that it has important benefits over the electroencephalogram, EEG. Wehave, however, earlier shown that the planar gradiometer MEG has measurementsensitivity distribution very similar to bipolar EEG. Here we show that, unlikeinitially believed, MEG is not complementary to EEG but gives only partially independentinformation. We have also earlier shown that MEG does not have better spatialresolution than EEG. Based on the newest information on the resistivity of theskull, we have recalculated the spatial resolution of EEG. These calculationsshow that EEG has even better spatial resolution than MEG.
Key words: EEG, MEG, lead field, spatial resolution.
Instructions to authors; 83–85
CopyrightTransfer Agreement; 86
