| 1. |
- Aderklou, Christina, et al.
(författare)
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Pedatronics : Robotic toys as a source to evoke young girls’ technological interest
- 2002
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Ingår i: 32nd Annual Frontiers in Education. Leading a Revolution in Engineering and Computer Science Education. - San Diego : Institute of Electrical and Electronics Engineers (IEEE). - 0780374444 ; , s. F1C-19-F1C-24
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Konferensbidrag (refereegranskat)abstract
- 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
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| 2. |
- Bengtsson, Ola, et al.
(författare)
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Localization in changing environments by matching laser range scans
- 1999
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Ingår i: 1999 Third European Workshop on Advanced Mobile Robots (Eurobot'99).. - : Institute of Electrical and Electronics Engineers (IEEE). - 0780356721 ; , s. 169-176
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Konferensbidrag (refereegranskat)abstract
- We present a novel scan matching algorithm, IDC-S, Iterative Dual Correspondence-Sector, that matches range scans. The algorithm is based on the known Iterative Dual Correspondence, IDC, algorithm which has shown good performance in real environments. The improvement is that IDC-S is able to deal with relatively large changes in the environment. It divides the scan in several sectors, detects and removes those sectors that are changed and matches the scans only using unchanged sectors. IDC-S and other variants of IDC are extensively simulated and evaluated. The simulations show that IDC-S is very robust and can locate in many different kind of environments. We also show that it is possible to effectively combine the existing IDC algorithms with IDC-S, thus obtaining an algorithm that performs very well both in rectilinear as well as nonrectilinear environments, even when changed as much as 65%. © 1999 IEEE.
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| 3. |
- Bengtsson, Ola, et al.
(författare)
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Localization in changing environments - Estimation of a covariance matrix for the IDC algorithm
- 2001
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Ingår i: Proceedings 2001 IEEE/RSJ International Conference on Intelligent Robots and Systems. Expanding the Societal Role of Robotics in the the Next Millennium (Cat. No.01CH37180). - Piscataway, N.J. : IEEE. - 0780366123 ; , s. 1931-1937
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Konferensbidrag (refereegranskat)abstract
- Previously we have presented a new scan-matching algorithm, based on the IDC - Iterative Dual Correspondence- algorithm, which showed a good localization performance even in the case of severe changes in the environment. The Problem of the IDC-algorithm is that there is no good way to estimate the covariance matrix of the position estimate, which prohibits an effective fusion with other position estimates from other sensors, e.g by means of the Kalman filter. In this paper we present a new way to estimate the covariance matrix, by estimating the Hessian matrix of the error function that is minimized by the IDC scan-matching algorithm. Simulation results show that the estimated covariance matrix correspond well to the real one.
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| 4. |
- Brorsson, Sofia, 1973-, et al.
(författare)
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A new force measurement device for evaluating finger extension function in the healthy and rheumatoid arthritis hand
- 2008
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Ingår i: Technology and Health Care. - Amsterdam : IOS Press. - 0928-7329 .- 1878-7401. ; 16:4, s. 283-292
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Tidskriftsartikel (refereegranskat)abstract
- Although often neglected, finger extension force is of great importance for developing grip strength. This paper describes the design and evaluation of a new finger extension force measurement device (EX-it) based on the biomechanics of the hand. Measurement accuracy and test-retest reliability were analysed. The device allows measurements on single fingers as well as all the fingers (excluding the thumb) of both healthy and deformed hands. The coefficient of variation in the device was 1.8% of the applied load, and the test-retest reliability showed a coefficient of variation no more than 7.1% for healthy subjects. This study also provides reference values for finger extension force in healthy subjects and patients with rheumatoid arthritis (RA). Significant differences were found in extension strength between healthy subject and RA patients (men, p < 0.05 and women, p < 0.001). EX-it provides objective and reliable data on the extension force capacity of normal and dysfunctional hands and can be used to evaluate the outcome of therapeutic interventions after hand trauma or disease
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| 5. |
- Hedenberg, Klas, et al.
(författare)
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Stereo vision-based collision avoidance
- 2004
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Ingår i: Conference proceedings - the 9th Mechatronics Forum international conference. - Ankara : Atılım University. - 9756707135 - 9789756707135 ; , s. 259-270
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This paper investigates whether a stereo vision system based on points of interest is robust enough to detect obstacles for applications like a mobile robot in an industrial environment and for the visually impaired. Points of interest are extracted with a known method, called KLT. Two algorithms to solve the correspondence problem (Sum of Squared Difference and Variance Normalized Correlation) are used and evaluated as well as a combination of the two. An improvement is made if the two algorithms are combined. The tests show that stereo vision based on points of interest only can be used robustly for obstacle detection if there is enough texture on the obstacle. Otherwise too few points of interest on the object are detected and a reliable estimation of the distance to the object cannot be made.
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