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  • Agelis, Sacki (författare)
  • Reconfigurable Optical Interconnection Networks for High-Performance Embedded
  • 2005
  • Licentiatavhandling (övrigt vetenskapligt)abstract
    • <p>In embedded computer and communication system the capacity demand for interconnection networks is increasing continuously in order to achieve high-performance systems. Recent breakthroughs show that by using reconfigurability inside a single chip substantial performance gains can be added. However, in this thesis the focus is on system level reconfigurability (between chips or modules) and the performance gains that potentially can be achieved by having support for runtime reconfigurability on the system level.This thesis addresses the field of runtime system level reconfigurability with the use of optics in switches and routers for data- and telecommunications, and in multi-processor systems used for embedded signal processing. Several reconfigurable systems for switching and routing with support to adapt for asymmetric traffic patterns are proposed and compared to identify how design choices affect flexibility, performance etc. The proposed solutions are characterized by their multistage optical interconnection networks with reconfigurable shuffle patterns, where the reconfigurability is provided by micro-optical-electrical mechanical systems. More specifically, application-specific bottlenecks can be resolved by reconfiguring the interconnection network according to the current application demands. The benefits of the architectural solutions are confirmed by simulations that clearly show that the architectures can achieve high performance for both symmetric application characteristics and for several classes of asymmetric application characteristics. The final architectural solution is characterized by electronic packet-switches interconnected through an optical backplane, which is reconfigurable. Moreover, the thesis presents how several signal processing applications can be mapped to run concurrently in a time-shared scheme on a single reconfigurable multi-processor system that has high flexibility to adapt for the application currently at hand. The interconnection network is then adapted (reconfigured) according to the demands of the currently executed application in each time instance. The analysis shows that it is feasible to build such a system with today’s components.</p>
  • Agelis, Sacki, et al. (författare)
  • Reconfigurable optical interconnection system supporting concurrent application-specific parallel computing
  • 2005
  • Ingår i: 17th Symposium on Computer Architecture and High Performance Computing : SBAC-PAD 2005 : proceedings : 24-27 October, 2005, Rio de Janeiro, PR, Brazil. - Washington, DC, USA : IEEE Computer Society. - 0-7695-2446-X ; s. 44-51
  • Konferensbidrag (refereegranskat)abstract
    • <p>Application specific architectures are highly desirable in embedded parallel computing systems at the same time as designers strive for using one embedded parallel computing platform for several applications. If this can be achieved, the cost can be decreased in comparison to using several different embedded parallel computing systems. This paper presents a novel approach of running several high-performance applications concurrently on one single parallel computing system. By using a reconfigurable backplane interconnection system, the applications can be run efficiently with high network flexibility since the interconnect network can be adapted to fit the application that is being processed for the moment. More precisely, this paper investigates how the space time adaptive processing (STAP) radar algorithm and the stripmap synthetic aperture radar (SAR) algorithm can be mapped on a multi-cluster processing system with a reconfigurable optical interconnection system realized by a micro-optical-electrical mechanical system (MOEMS) crossbars. The paper describes the reconfigurable platform, the two algorithms and how they individually can be mapped on the targeted multiprocessor system. It is also described how these two applications can be mapped simultaneously on the optical reconfigurable platform. Implications and requirements on communication bandwidth and processor performance in different critical points of the two applications are presented. The results of the analysis show that an implementation is feasible with today's MOEMS technology, and that the two applications can be successfully run in a time-sharing scheme, both at the processing side and at the access for interconnection bandwidth.</p>
  • Ahlborg, Tone, et al. (författare)
  • Assessing the Quality of the Dyadic Relationship in First-Time Parents : Development of a New Instrument
  • 2005
  • Ingår i: Journal of Family Nursing. - Thousand Oaks, Calif. : Sage Publications. - 1074-8407 .- 1552-549X. ; 11:1, s. 19-37
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The purpose of this research was to psychometrically evaluate the Dyadic Adjustment Scale (DAS), modified for use with new, first-time parents by extending the items of communication, sensuality, and sexuality. A total of 820 Swedish respondents, 6 months after the birth of their first child, participated in the study. Psychometric evaluation was conducted with factor analysis. The obtained factor structure was tested with multitrait analysis program. Thirty-three itemswere found to fit into a five-factor solution, explaining 50% of the total variance. Descriptive data revealed thatmost new parentswere satisfied with their intimate relationship in general, but dissatisfied with their sexual lives. Themodified DAS, now called the Quality of Dyadic Relationship Instrument includes 33 items and seems to be a useful, updated measurement for assessing quality of the intimate relationship in new first-time parents.</p>
  • Ahlborg, Tone, et al. (författare)
  • Quality of the Intimate and Sexual Relationship in the First-Time Parents Six Months After Delivery
  • 2005
  • Ingår i: Journal of Sex Research. - Syracuse, N.Y. : Society for the Scientific Study of Sexuality. - 0022-4499 .- 1559-8519. ; 42:2, s. 167-174
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>This study aimed to describe the quality of the intimate relationship among parents six months after the birth of their first child. The Dyadic Adjustment Scale (DAS) has been modified and used on 820 responding first-time parents, of which 768 were couples. The results reveal that most parents were happy in their relationship, but both mothers and fathers were discontented with the dyadic sexuality. "Being too tired for sexual activity" was a problem, especially for the mothers, and the most common frequency of intercourse was once or twice per month. The result does not support the assumption that the couples compensate the lacking sexuality with sensuality. Good communication within the couple was associated with higher levels of several dimensions of the intimate relationship, especially dyadic consensus and satisfaction. Thus, one way to stabilize and strengthen a relationship when dyadic sexual activity is low would be to emphasize dyadic communication and sensual activity.</p>
  • Alonso-Fernandez, Fernando, 1978-, et al. (författare)
  • A Review Of Schemes For Fingerprint Image Quality Computation
  • 2005
  • Ingår i: COST Action 275 : Proceedings of the third COST 275 Workshop Biometrics on the Internet. - Luxembourg : EU Publications Office (OPOCE). - 978-92-898-0019-8 ; s. 3-6
  • Konferensbidrag (refereegranskat)abstract
    • <p>Fingerprint image quality affects heavily the performance of fingerprint recognition systems. This paper reviews existing approaches for fingerprint image quality computation. We also implement, test and compare a selection of them using the MCYT database including 9000 fingerprint images. Experimental results show that most of the algorithms behave similarly.</p>
  • Alonso-Fernandez, Fernando, et al. (författare)
  • An enhanced Gabor filter-based segmentation algorithm for fingerprint recognition systems
  • 2005
  • Konferensbidrag (refereegranskat)abstract
    • <p>An imponant step in fingerprint recognition is the segmentation of the region of interest. In this paper, we present an enhanced approach for fingerprint segmentation based on the response of eight oriented Gabor filters. The performance of the algorithm has been evaluated in terms of decision error trade-off curves of an overall verification system. Experimental results demonstrate the robustness of the proposed method.</p>
  • Alonso-Fernandez, Fernando, et al. (författare)
  • On-line signature verification using Tablet PC
  • 2005
  • Ingår i: Proceedings of the 4th International Symposium on Image and Signal Processing and Analysis : Zagreb, Croatia, 15 - 17 September, 2005. - Zagreb : University of Zagreb. - 978-953184089-7 - 953-184-089-X ; s. 245-250
  • Konferensbidrag (refereegranskat)abstract
    • <p>On-line signature verification for Tablet PC devices is studied. The on-line signature verification algorithm presented by the authors at the First International Signature Verification Competition (SVC 2004) is adapted to work in Tablet PC environments. An example prototype of securing access and securing document application using this Tablet PC system is also reported. Two different commercial Tablet PCs are evaluated, including information of interest for signature verification systems such as sampling and pressure statistics. Authentication performance experiments are reported considering both random and skilled forgeries by using a new database with over 3000 signatures.</p>
  • Alonso-Fernandez, Fernando, et al. (författare)
  • Sensor interoperability and fusion in signature verification a case study using Tablet PC
  • 2005
  • Ingår i: Advances in biometric person authentification : International workshop on biometric recognition systems, IWBRS 2005, Beijing, China, October 22-23, 2005 : proceedings. - New York : Springer-Verlag New York. - 978-354029431-3 ; s. 180-187
  • Konferensbidrag (refereegranskat)abstract
    • <p>Several works related to information fusion for signature verification have been presented. However, few works have focused on sensor fusion and sensor interoperability. In this paper, these two topics are evaluated for signature verification using two different commercial Tablet PCs. An enrolment strategy using signatures from the two Tablet PCs is also proposed. Authentication performance experiments are reported by using a database with over 3000 signatures. © Springer-Verlag Berlin Heidelberg 2005.</p>
  • Anderberg, Cecilia, et al. (författare)
  • Wear Resistance of Smooth Automotive Cylinder Liner Surfaces
  • 2005
  • Ingår i: World Tribology Congress III, Volume 2. - New York, NY : ASME Press. - 0-7918-4202-9 ; s. 603-604
  • Konferensbidrag (refereegranskat)abstract
    • <p>Demands for decreased environmental impact from vehicles are resulting in a strong push for decreased engine oil, fuel consumption and weight. New machining and coating technologies have offered ways to attack these problems. Engine oil and fuel consumption are to a great extent controlled by the topography of the cylinder liner surface and it is therefore important to optimise this surface. Recent engine tests have shown a reduction in oil consumption when using cylinder liners with a smoother finish than that given by the current plateau honing. However, engine manufacturers are hesitant to introduce smoother liner surfaces because of fears of severe wear and scuffing. There is also the possibility that smoother liner surfaces may be more sensitive to the choice of piston ring finishes. This paper therefore seeks to investigate the functional performance and resistance to wear of these smooth cylinder liners and the mating top ring surfaces. Copyright © 2005 by ASME</p>
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