| 1. |
- Bälter, Katarina, et al.
(författare)
-
Web-based and mailed questionnaires : A comparison of response rates and compliance
- 2005
-
Ingår i: Epidemiology. - Karolinska Inst, Dept Med Epidemiol & Biostat, SE-17177 Stockholm, Sweden. : Ovid Technologies (Wolters Kluwer Health). - 1044-3983 .- 1531-5487. ; 16:4, s. 577-579
-
Tidskriftsartikel (refereegranskat)abstract
- Background: We assessed response rates and compliance for a printed questionnaire and a Web questionnaire in a Swedish population-based study and explored the influence of adding personalized feedback to the Web questionnaire. Methods: We assigned 875 subjects to I of 3 groups: printed questionnaire, plain Web questionnaire, or Web questionnaire with personalized feedback. The questionnaire had 2 parts, first a general section and then a dietary section. Results: The response rate for the general section was 64% for the printed questionnaire, compared with 50% for the Web questionnaire with feedback. For the dietary questionnaire, the rates were reversed, resulting in a total response rate for the dietary questionnaire that did not differ between printed and web questionnaire with feedback. Conclusions: Interactivity in the Web questionnaire increased compliance in completion of the second section of the questionnaire. Web questionnaires can be useful for research purposes in settings in which Internet access is high.
|
|
| 2. |
- Bälter, Olle, 1962-, et al.
(författare)
-
Demands on web survey tools for epidemiological research
- 2005
-
Ingår i: European Journal of Epidemiology. - Karolinska Inst, Dept Med Epidemiol & Biostat, Stockholm, Sweden. : Springer Science and Business Media LLC. - 0393-2990 .- 1573-7284. ; 20:2, s. 137-139
-
Tidskriftsartikel (refereegranskat)abstract
- In countries where the Internet access is high, a web-based questionnaire could save time and money compared to printed questionnaires, mainly by eliminating the two steps of transferring answers from printed to a digital data set and manually completing missing and impossible answers. However, many of the features wanted for conducting large epidemiological studies are not available in many web survey systems. Here we describe design issues the investigator needs to be aware of when using web-based questionnaires in epidemiological research.
|
|
| 3. |
- Lagerros, Y. T., et al.
(författare)
-
Validity and reliability of self-reported total energy expenditure using a novel instrument
- 2006
-
Ingår i: European Journal of Epidemiology. - Karolinska Inst, Dept Med Epidemiol & Biostat, SE-17177 Stockholm, Sweden. Harvard Univ, Sch Publ Hlth, Dept Epidemiol, Boston, MA 02115 USA. Univ Milano Bicocca, Dept Stat, Milan, Italy. Royal Inst Technol, Sch Comp Sci & Commun, Stockholm, Sweden. : Springer Science and Business Media LLC. - 0393-2990 .- 1573-7284. ; 21:3, s. 227-236
-
Tidskriftsartikel (refereegranskat)abstract
- Improved methods for quantitative self-reports of total physical activity in epidemiological studies are needed. We evaluated randomly selected individuals' ability to integrate their perception of physical activity over time to produce an estimate of the usual level, using a novel instrument for self-quantification of energy expenditure. A population-based sample of 418 Swedish men and women, age 20-59, completed a questionnaire containing the new instrument. For validation, three 24 hour recalls by phone served as gold standard. Reproducibility was assessed through administering the instrument another three times. The validation involved 133 subjects and another 160 completed the reproducibility evaluation. Pearson correlation between usual daily energy expenditure measured by the instrument and the mean of the 24 hour recalls was 0.73. After subdividing the self-reported daily energy expenditure and the mean of the 24 hour recalls into quintiles, 83.5% of the participants remained in the same quintile, or one quintile apart. There was a tendency towards overestimation of usual daily physical activity. This was significantly associated with low education. Reproducibility showed an intraclass correlation of 0.55. Although integrated reports of usual daily energy expenditure over longer periods seem to be afflicted with a tendency of overestimation, total energy expenditure can be estimated with reasonable validity and reproducibility using our instrument.
|
|
| 4. |
- Bälter, Olle
(författare)
-
Diagnostic Web-based Monitoring in CS1
- 2009
-
Ingår i: Proceedings of the 9th Koli Calling International Conference on Computing Education Research. ; , s. 63-66
-
Konferensbidrag (refereegranskat)abstract
- Students that fall behind during a course are a concern in any teaching situation. Falling behind has negative effects both for students, teachers and the university. Close monitoring of the learning and development can be effective, but is in general timeconsuming and expensive. The use of a web-based diagnostic system that can generate a large (infinite) number of questions could make monitoring both time and cost effective.
|
|
| 5. |
- Bälter, Olle
(författare)
-
Ideas for Engineering Education Inspired by Liberal Arts Colleges : Part 0ne
- 2009
-
Ingår i: Proceedings of 2:a Utvecklingskonferensen för Sveriges ingenjörsutbildningar, Lund December 2-3.. ; , s. 123-124
-
Konferensbidrag (refereegranskat)abstract
- After spending the fall 2008 at one of the best colleges in the United States, Williams College, I have stolen several ideas that could be used to improve Swedish engineering education. The first four of these ideas regard admission, study results monitoring, examination demands and sabbaticals. I hope that the remaining ideas can be presented at this conference next year.
|
|
| 6. |
- Bälter, Olle, et al.
(författare)
-
Wizard-of-Oz Test of ARTUR - a Computer-Based Speech Training System with Articulation Correction
- 2005
-
Ingår i: proceedings of ASSETS 2005. - 1595931597 ; , s. 36-43
-
Konferensbidrag (refereegranskat)abstract
- This study has been performed in order to test the human-machine interface of a computer-based speech training aid named ARTUR with the main feature that it can give suggestions on how to improve articulation. Two user groups were involved: three children aged 9-14 with extensive experience of speech training, and three children aged 6. All children had general language disorders. The study indicates that the present interface is usable without prior training or instructions, even for the younger children, although it needs some improvement to fit illiterate children. The granularity of the mesh that classifies mispronunciations was satisfactory, but can be developed further.
|
|
| 7. |
- Engwall, Olov, et al.
(författare)
-
Designing the user interface of the computer-based speech training system ARTUR based on early user tests
- 2006
-
Ingår i: Behavior and Information Technology. - : Informa UK Limited. - 0144-929X .- 1362-3001. ; 25:4, s. 353-365
-
Tidskriftsartikel (refereegranskat)abstract
- This study has been performed in order to evaluate a prototype for the human - computer interface of a computer-based speech training aid named ARTUR. The main feature of the aid is that it can give suggestions on how to improve articulations. Two user groups were involved: three children aged 9 - 14 with extensive experience of speech training with therapists and computers, and three children aged 6, with little or no prior experience of computer-based speech training. All children had general language disorders. The study indicates that the present interface is usable without prior training or instructions, even for the younger children, but that more motivational factors should be introduced. The granularity of the mesh that classifies mispronunciations was satisfactory, but the flexibility and level of detail of the feedback should be developed further.
|
|
| 8. |
- Engwall, Olov, et al.
(författare)
-
Feedback management in the pronunciation training system ARTUR
- 2006
-
Ingår i: Proceedings of CHI 2006. - New York, NY, USA : ACM. - 1595932984 ; , s. 231-234
-
Konferensbidrag (refereegranskat)abstract
- This extended abstract discusses the development of a computer-assisted pronunciation training system that gives articulatory feedback, and in particular the management of feedback given to the user.
|
|
| 9. |
- Engwall, Olov, et al.
(författare)
-
Pronunciation feedback from real and virtual language teachers
- 2007
-
Ingår i: Computer Assisted Language Learning. - : Informa UK Limited. - 0958-8221 .- 1744-3210. ; 20:3, s. 235-262
-
Tidskriftsartikel (refereegranskat)abstract
- The aim of this paper is to summarise how pronunciation feedback on the phoneme level should be given in computer-assisted pronunciation training (CAPT) in order to be effective. The study contains a literature survey of feedback in the language classroom, interviews with language teachers and their students about their attitudes towards pronunciation feedback, and observations of how feedback is given in their classrooms. The study was carried out using focus group meetings, individual semi-structured interviews and classroom observations. The feedback strategies that were advocated and observed in the study on pronunciation feedback from human teachers were implemented in a computer-animated language tutor giving articulation feedback. The virtual tutor was subsequently tested in a user trial and evaluated with a questionnaire. The article proposes several feedback strategies that would improve the pedagogical soundness of CAPT systems.
|
|
| 10. |
- Eriksson, Elina, et al.
(författare)
-
Design Recommendations for a Computer-Based Speech Training System Based on End User Interviews
- 2005
-
Ingår i: Proceedings of the Tenth International Conference on Speech and Computers. ; , s. 483-486
-
Konferensbidrag (refereegranskat)abstract
- This study has been performed in order to improve theusability of computer-based speech training (CBST) aids.The aim was to engage the users of speech training systemsin the first step of creating a new CBST aid. Speechtherapists and children with hearing- or speech impairmentwere interviewed and the result of the interviews ispresented in the form of design recommendations.
|
|
| 11. |
- Kjellström, Hedvig, et al.
(författare)
-
Audio-visual phoneme classification for pronunciation training applications
- 2007
-
Ingår i: INTERSPEECH 2007. - BAIXAS : ISCA-INST SPEECH COMMUNICATION ASSOC. - 9781605603162 ; , s. 57-60
-
Konferensbidrag (refereegranskat)abstract
- We present a method for audio-visual classification of Swedish phonemes, to be used in computer-assisted pronunciation training. The probabilistic kernel-based method is applied to the audio signal and/or either a principal or an independent component (PCA or ICA) representation of the mouth region in video images. We investigate which representation (PCA or ICA) that may be most suitable and the number of components required in the base, in order to be able to automatically detect pronunciation errors in Swedish from audio-visual input. Experiments performed on one speaker show that the visual information help avoiding classification errors that would lead to gravely erroneous feedback to the user; that it is better to perform phoneme classification on audio and video separately and then fuse the results, rather than combining them before classification; and that PCA outperforms ICA for fewer than 50 components.
|
|
| 12. |
- Kjellström, Hedvig, et al.
(författare)
-
Reconstructing Tongue Movements from Audio and Video
- 2006
-
Ingår i: INTERSPEECH 2006 AND 9TH INTERNATIONAL CONFERENCE ON SPOKEN LANGUAGE PROCESSING, Vol. 1-5. - BAIXAS : ISCA-INST SPEECH COMMUNICATION ASSOC. - 9781604234497 ; , s. 2238-2241
-
Konferensbidrag (refereegranskat)abstract
- This paper presents an approach to articulatory inversion using audio and video of the user's face, requiring no special markers. The video is stabilized with respect to the face, and the mouth region cropped out. The mouth image is projected into a learned independent component subspace to obtain a low-dimensional representation of the mouth appearance. The inversion problem is treated as one of regression; a non-linear regressor using relevance vector machines is trained with a dataset of simultaneous images of a subject's face, acoustic features and positions of magnetic coils glued to the subjects's tongue. The results show the benefit of using both cues for inversion. We envisage the inversion method to be part of a pronunciation training system with articulatory feedback.
|
|
