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  • Aderklou, Christina, et al. (författare)
  • Pedatronics : Robotic toys as a source to evoke young girls’ technological interest
  • 2002
  • Ingår i: 32nd Annual Frontiers in Education. Leading a Revolution in Engineering and Computer Science Education : Conference Proceedings Volume III - Saturday Sessions. Boston Park Plaza Hotel, Boston, Massachusetts, November 6-9, 2002. - San Diego : Institute of Electrical and Electronics Engineers (IEEE). - 0-7803-7444-4 ; s. F1C-19-F1C-24
  • Konferensbidrag (refereegranskat)abstract
    • <p>This paper presents some results within Pedatronics; a fusion between pedagogics and mechatronics. Our research interest is to study what emerges in the play with robotic toys. Field-experimental studies of 67 year old children’s purposeless play with robotic toys created a self-developmental sphere, as well as evoked young girl’s technological interest. Both girls and boys prolonged and intensified their interest according to the amount of gadgets involved. The results disclose a learning potential, indicating the importance to develop strategies at an early stage in order to encourage girls to choose technological and engineering educations. The study recommend engineers and toy designers, in cooperation with children, to move towards ’Integrated Play Systems’. Due to an ethological method, the results differ from other studies of children’s play with technological advanced artefacts. © 2002 IEEE</p>
  • Agelis, Sacki, et al. (författare)
  • Modular interconnection system for optical PCB and backplane communication
  • 2002
  • Ingår i: Parallel and Distributed Processing Symposium., Proceedings International, IPDPS 2002, Abstracts and CD-ROM. - Los Alamitos, Calif. : IEEE Press. - 0-7695-1573-8 ; s. 245-250
  • Konferensbidrag (refereegranskat)abstract
    • <p>This paper presents a way of building modular systems with a powerful optical interconnection network. Each module, placed on a Printed Circuit Board (PCB), has a generic optical communication interface with a simple electronic router. Together with optical switching using micro-electromechanical system (MEMS) technology, packet switching over reconfigurable topologies is possible. The interconnection system gives the possibility to integrate electronics with optics without changing existing PCB technology. Great interest from industry is therefore expected and the cost advantages are several: reuse of module designs, module upgrades without changing the PCB, low-cost conventional PCB technology, etc. In the version described in this paper, the interconnection system has 48 bidirectional optical channels for intra-PCB communication on each board. For inter-PCB communication, a backplane with 192 bidirectional optical channels supports communication between twelve PCBs. With 2.5 Gbit/s per optical channel in each direction, the aggregated intra-PCB bit rate is 120 Gbit/s full duplex (on each PCB) while the aggregated inter-PCB bit rate is 480 Gbit/s full duplex. A case study shows the feasibility of the interconnection system in a parallel processing system for radar signal processing.</p>
  • Agelis, Sacki, et al. (författare)
  • Optoelectronic router with a reconfigurable shuffle network based on micro-optoelectromechanical systems
  • 2004
  • Ingår i: Journal of Optical Networking. - Washington, USA : Optical Society of America. - 1536-5379. ; 4:1, s. 1-10
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>An optoelectronic router with a shuffle exchange network is presented and enhanced by the addition of micro-optoelectromechanical systems (MOEMS) in the network to add the ability to reconfigure the shuffle network. The MOEMS described here are fully connected any-to-any crossbar switches. The added reconfigurability provides the opportunity to adapt the system to different common application characteristics. Two representative application models are described: The first has symmetric properties, and the second has asymmetric properties. The router system is simulated with the specified applications and an analysis of the results is carried out. By use of MOEMS in the optical network, and thus reconfigurability, greater than 50% increased throughput performance and decreased average packet delay are obtained for the given application. Network congestion is avoided throughout the system if reconfigurability is used.</p>
  • Agelis, Sacki, et al. (författare)
  • System-Level Runtime Reconfigurablity - Optical Interconnection Networks for Switching Applications
  • 2004
  • Ingår i: Proceedings of the International Conference on Engineering of Reconfigurable Systems and Algorithms, ERSA'04. - Athens, USA : CSREA Press. - 1-932415-42-4 - 978-193241542-1 ; s. 155-162
  • Konferensbidrag (refereegranskat)abstract
    • <p>The performance requirements on data and telecommunication switches and routers are continuously increasing and it is evident that new ideas and architectures must come to light to satisfy these new demands. In this paper, a runtime reconfigurable modular design approach is presented, using state-of-the-art microoptical-electrical mechanical system (MOEMS) components. The paper introduces a novel field of reconfigurability, where reconfiguration is made on the system level instead of, e.g. fine-granularity reconfigurable logic. Different reconfigurable system solutions with support to adapt for asymmetric traffic patterns are proposed and compared to see how design choices affect flexibility, performance etc. The proposed solutions are characterized by their multistage networks with reconfigurable shuffle patterns.</p>
  • Agelis, Sacki, et al. (författare)
  • Visualizing the Potential of Reconfigurable Shuffle-Patterns in Optoelectronic Routers by the Use of MOEMS
  • 2004
  • Ingår i: Proceedings of the IASTED International Conference Communication Systems and Networks. - Calgary, Canada : ACTA Press. - 0-88986-450-0 ; s. 148-154
  • Konferensbidrag (refereegranskat)abstract
    • <p>A reconfigurable high performance multistage router architecture is presented and simulated. The router backbone network is an optical shuffle exchange network that has the power of reconfigurability through the use of micro-optical-electrical mechanical systems (MOEMS). The router is subjected to different application classes. The application classes have different characteristics in terms of symmetric/asymmetric traffic properties. We compare our reconfigurable shuffle-pattern for all three application classes for the specified router architecture.</p>
  • Aires, Nibia (författare)
  • A guide to the Fortran programs to calculate inclusion probabilities for conditional Poisson sampling and Pareto pi ps sampling designs
  • 2004
  • Ingår i: Computational statistics (Zeitschrift). - Heidelberg : Physica Verlag. - 0943-4062 .- 1613-9658. ; 19:3, s. 337-345
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Conditional Poisson Sampling and Pareto pips Sampling designs are sampling methods with fixed sample size and with inclusion probabilities proportional to given size measures.. Algorithms were introduced to calculate first and second exact inclusion probabilities for both schemes. Methods were also provided to adjust the parameters to get predetermined inclusion probabilities. In this paper, the Fortran procedures are introduced and documented. Moreover, guidelines are provided for their use as well as examples and the programs codes commented.</p>
  • Alfermann, D., et al. (författare)
  • Reactions to sport career termination : A cross-national comparison of German, Lithuanian, and Russian athletes
  • 2004
  • Ingår i: Psychology of Sport And Exercise. - Amsterdam : Elsevier. - 1469-0292 .- 1878-5476. ; 5:1, s. 61-75
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Objectives: To assess the cognitive, emotional, and behavioural consequences of sport career termination of national and international level athletes in three nations.</p><p>Design and methods: Athletes of Germany (<em>n</em>=88), Lithuania (<em>n</em>=65), and Russia (<em>n</em>=101) were asked to describe in retrospect their reactions to career termination. The Athletic Retirement Questionnaire developed by the first two authors and presented in three corresponding languages was used. Planning of retirement and national identity served as independent variables. Dependent variables were reasons and circumstances for career termination, participants’ emotional reactions, coping reactions, athletic identity during and after sport career, and adjustment to life after career termination.</p><p>Results: Analyses of variance revealed significant main effects of retirement planning and national identity on most dependent variables. Planning of retirement contributed to significantly better cognitive, emotional, and behavioural adaptation. In addition, high athletic identity contributed to less positive reactions to retirement and to more problems in the adaptation process. The emotional reactions of Russian and Lithuanian athletes were similar, but differed from the German athletes who, in general, showed more positive and lesser negative emotions after retirement. Though accepting the reality of retirement was the most often used coping strategy among all participants, Lithuanian athletes showed more denial and Russian athletes more distraction strategies after retirement than the other nations.</p><p>Discussion: The results are discussed with regard to athletes’ readiness for career transition in different social and cultural environments. Recommendations are given on how to help athletes to prepare for and to cope with career termination. © 2003 Elsevier Ltd. All rights reserved.</p>
  • Alm, Ilkoo, et al. (författare)
  • Cognitive aspects in visualisation of complex data
  • 2001
  • Ingår i: CISST'2001 : proceedings of the International Conference on Imaging Science, Systems, and Technology : Las Vegas, Nevada, USA, June 25-28, 2001. - Avalon, Athens, USA : CSREA Press. - 1-892512-74-2 ; s. 633-638
  • Konferensbidrag (refereegranskat)abstract
    • <p>Information Visualization applications are dealing with fundamental difficulties related to overlap in cognitive models between designers and users, goal ambiguity, and accuracy in search strategies These difficulties are more obvious in applications aimed at reducing information overload by general users, than in applications aimed at visualising scientific data. General users have very likely quite different cognitive reference for approaching an abstract complex task, than designers. This can result in designs which can unintentionally increase information overload by users. In visualisation of scientific data the overlap of cognitive reference between specialists and designs is very likely much higher, but we need methods which can facilitate data exploration in real-time interaction. One possibility to facilitate exploration in a more or less systematic way is by means of metaphors which can support human perception in searching for patterns.</p>
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