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Träfflista för sökning "WFRF:(Nilsson Markus) ;mspu:(conferencepaper)"

Sökning: WFRF:(Nilsson Markus) > Konferensbidrag

  • Resultat 1-10 av 52
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1.
  • Burström, Lage, 1954-, et al. (författare)
  • Acute effects of vibration on thermal perception thresholds
  • 2006
  • Ingår i: Diagnosis of injuries caused by hand-transmitted vibration - 2nd International workshop, Göteborg, 2006. - : Springer Science and Business Media LLC.
  • Konferensbidrag (refereegranskat)abstract
    • Objective This study focuses on the acute effects of vibration and how vibrations influence the measures of the thermal perception thresholds during different vibration magnitudes, frequencies, and durations.Methods The fingers of ten healthy subjects, five males and five females, were exposed to vibration under 16 conditions with a combination of different frequency, intensity and exposure time. The vibration frequency was 31.5 and 125 Hz and exposure lasted between 2 and 16 min. The energy-equivalent frequency weighted acceleration, according to ISO 5349-1, for the experimental time of 16 min was 2.5 or 5.0 m/s(2) (r.m.s.), corresponding to a 8-h equivalent acceleration, A(8) of 0.46 and 0.92 m/s(2), respectively. A measure of the thermal perception of cold and warmth was conducted before the different exposures to vibration. Immediately after the vibration exposure the acute effect was measured continuously on the exposed index finger for the first 75 s, followed by 30 s of measures at every minute for a maximum of 10 min. If the subject's thermal thresholds had not recovered, the measures continued for a maximum of 30 min with measurements taken every 5 min.Results For all experimental conditions and 30 s after exposure, the mean changes of the thresholds compared with the pre-test were found to be 0.05 and -0.67C for the warmth and cold thresholds, respectively. The effect of the vibration exposure was only significant on the cold threshold and only for the first minute after exposure when the threshold was decreased. The warmth threshold was not significantly affected at all. The frequency and the exposure time of the vibration stimuli had no significant influence on the perception thresholds for the sensation of cold or warmth. Increased equivalent frequency weighted acceleration resulted in a significant decrease of the subjects' cold threshold, not the warmth. The thresholds were unaffected when changes in the vibration magnitude were expressed as the frequency weighted acceleration or the unweighted acceleration.Conclusion When testing for the thermotactile thresholds, exposure to vibration on the day of a test might influence the results. Until further knowledge is obtained the previous praxis of 2 h avoidance of vibration exposure before assessment is recommended.
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2.
  • Hall, Johan, et al. (författare)
  • Single Malt or Blended? A Study in Multilingual Parser Optimization
  • 2007
  • Ingår i: Proceedings of the CoNLL Shared Task Session of EMNLP-CoNLL 2007. - : Association for Computational Linguistics. ; , s. 933–939-
  • Konferensbidrag (refereegranskat)abstract
    • We describe a two-stage optimization of the MaltParser system for the ten languages in the multilingual track of the CoNLL 2007 shared task on dependency parsing. The first stage consists in tuning a single-parser system for each language by optimizing parameters of the parsing algorithm, the feature model, and the learning algorithm. The second stage consists in building an ensemble system that combines six different parsing strategies, extrapolating from the optimal parameters settings for each language. When evaluated on the official test sets, the ensemble system significantly outperforms the single-parser system and achieves the highest average labeled attachment score.
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  • Agebro, Markus, et al. (författare)
  • Driver preferences of steering gear ratio and steering wheel effort : A driving simulator study
  • 2006
  • Ingår i: Proceedings of the FISITA World Automotive Congress, Yokohama, Japan 2006..
  • Konferensbidrag (refereegranskat)abstract
    • When driving an automobile, the driver has to correct the course as a result of road curvature and external disturbances. In order to make the vehicle both controllable and comfortable to drive, it is important that the steering system is designed with different drivers in mind. In this work, driver preferences of steering system characteristics is investigated by comparing standard steering wheel settings with unconventional steering gear ratio and steering wheel effort. The investigation is made using 18 test subjects in a moving base driving simulator. The evaluation includes two scenarios. In the first scenario the driver is overtaking a bus at 110 km/h when meeting traffic in the opposite lane. In the second scenario the driver is doing a manoeuvre by following a cone track at 55 km/h. To investigate if there are differences in preference of drivers with varying experience of driving, the drivers are chosen to either be low or high mileage drivers. People that drive less than 5,000 km/year are considered to be low mileage drivers, and people that drive more than 25,000 km/year are considered to be high mileage drivers. The results show that original settings of a typical passenger car, which served as reference, prove to display favourable characteristics compared to the unconventional settings investigated. However, there might be settings within the investigated intervals that can be considered superior. A distinct trend in the results is that increasing effort will lead to increased perceived stability, independent of ratio. High mileage drivers find the setting with low ratio and reference effort to possess better qualities than the reference when evaluating the attributes steering wheel force and response and only slightly less favourable properties than the reference when evaluating the attribute stability. High mileage drivers display a more distinct opinion and a higher sensitivity when evaluating the attributes. Despite the differing setup of the scenarios, many similarities can be observed when studying the results. Even though there are similarities in the results both between the scenarios and the categories of drivers, a study of the individual test subjects´ preferences reveal that several drivers prefer other settings than the reference for the investigated scenarios. Therefore, it is clear that the driver-vehicle system would benefit from tailoring the steering characteristics to the situation and driver.
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  • Arlos, Patrik, et al. (författare)
  • A Distributed Passive Measurement Infrastructure
  • 2005
  • Konferensbidrag (refereegranskat)abstract
    • In this paper we describe a distributed passive measurement infrastructure. Its goals are to reduce the cost and configuration effort per measurement. The infrastructure is scalable with regards to link speeds and measurement locations. A prototype is currently deployed at our university and a demo is online at http://inga.its.bth.se/projects/dpmi. The infrastructure differentiates between measurements and the analysis of measurements, this way the actual measurement equipment can focus on the practical issues of packet measurements. By using a modular approach the infrastructure can handle many different capturing devices. The infrastructure can also deal with the security and privacy aspects that might arise during measurements.
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  • Blomquist, Tomas, et al. (författare)
  • Development of Virtual Teams and Learning Communities
  • 2005
  • Ingår i: Recent Research Developments in Learning Technologies. - Badajos, Spain : Formatex Research Center. ; , s. 1184-1189
  • Konferensbidrag (refereegranskat)abstract
    • Students of an Internet based course in project management worked during a 20 week period in teams of 4-6 persons. The course consisted of Swedish students living in Sweden or abroad which made it impossible for many of the teams to have any face-to-face interaction. During the course the teams were assigned to a series of discussion questions and cases. The study, based on a survey of 287 students who participated in the course, examined their experience of teamwork and showed that many of the classical team development issues also evolve in a virtual team. Furthermore, the study showed that students considered their teamwork was efficient and that being able to communicate, discuss and share experiences was essential for developing a positive learning community.
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  • Blomquist, Tomas, et al. (författare)
  • Project as practice : making project research matter
  • 2006
  • Ingår i: Proceedings of IRNOP VII project research conference. - Beijing : China Publishing House of Electronics Industry. - 712103252X ; , s. 540-549
  • Konferensbidrag (refereegranskat)abstract
    • Project theory is not only an immature field of research, it is insubstantial when it comes to understanding what is really going on in projects. This paper contributes to making project research matter to the academic as well as the practitioner through the theoretical development of a project-as-practice approach, aligned with an ongoing debate in social science research. We outline the framework of project-as-practice and argue that there are two major challenges to the researcher: the relevance challenge and the pattern challenge. We suggest how these challenges can be met and give some examples of earlier studies that have done so. The practice approach is not a substitute to present theorizing but rather a complement that brings substance. Finally, underlying notions of the practice approach are outlined in order to have a fruitful future development of a project-as-practice approach that makes project theory matter!
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