| 1. |
- Beskow, Jonas, et al.
(författare)
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Expressive animated agents for affective dialogue systems
- 2004
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Ingår i: AFFECTIVE DIALOGUE SYSTEMS, PROCEEDINGS. - BERLIN : SPRINGER. - 3540221433 ; , s. 240-243
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Konferensbidrag (refereegranskat)abstract
- We present our current state of development regarding animated agents applicable to affective dialogue systems. A new set of tools are under development to support the creation of animated characters compatible with the MPEG-4 facial animation standard. Furthermore, we have collected a multimodal expressive speech database including video, audio and 3D point motion registration. One of the objectives of collecting the database is to examine how emotional expression influences articulatory patterns, to be able to model this in our agents. Analysis of the 3D data shows for example that variation in mouth width due to expression greatly exceeds that due to vowel quality.
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| 2. |
- Beskow, Jonas, et al.
(författare)
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The Swedish PFs-Star Multimodal Corpora
- 2004
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Ingår i: Proceedings of LREC Workshop on Models of Human Behaviour for the Specification and Evaluation of Multimodal Input and Output Interfaces. ; , s. 34-37
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Konferensbidrag (refereegranskat)abstract
- The aim of this paper is to present the multimodal speech corpora collected at KTH, in the framework of the European project PF-Star, and discuss some of the issues related to the analysis and implementation of human communicative and emotional visual correlates of speech in synthetic conversational agents. Two multimodal speech corpora have been collected by means of an opto-electronic system, which allows capturing the dynamics of emotional facial expressions with very high precision. The data has been evaluated through a classification test and the results show promising identification rates for the different acted emotions. These multimodal speech corpora will truly represent a valuable source to get more knowledge about how speech articulation and communicative gestures are affected by the expression of emotions.
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| 3. |
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| 4. |
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| 5. |
- Nordstrand, Magnus, et al.
(författare)
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Measurements of articulatory variation in expressive speech for set of Swedish vowels
- 2004
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Ingår i: Speech Communication. - : Elsevier BV. - 0167-6393 .- 1872-7182. ; 44:1-4, s. 187-196
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Tidskriftsartikel (refereegranskat)abstract
- Facial gestures are used to convey e.g. emotions, dialogue states and conversational signals, which support us in the interpretation of other people's feelings and intentions. Synthesising this behaviour with an animated talking head would widen the possibilities of this intuitive interface. The dynamic characteristics of these facial gestures during speech affect articulation. Previously, articulation for neutral speech has been studied and implemented in animation rules. The results obtained in this study show how some articulatory parameters are affected by the influence of expressiveness in speech for a selection of Swedish vowels. Our focus has primarily been on attitudes and emotions conveying information that is intended to make an animated agent more "human-like". A multimodal corpus of acted expressive speech has been collected for this purpose.
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| 6. |
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| 7. |
- Ståhl, Magnus, et al.
(författare)
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Industrial processes for biomass drying and their effects on the quality properties of wood pellets
- 2004
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Ingår i: Biomass and Bioenergy 27:621-628, 2004. - : Elsevier. ; Vol.27, s. 621-628
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Tidskriftsartikel (refereegranskat)abstract
- This paper contributes to the discussion of how different kinds of industrial scale dryers for biomass influence the quality properties of wood pellets. It also discusses how the drying technique can affect the environment. The most common biomass drying processes in use, i.e., convection dryers are discussed. The discussion of drying techniques is based on advantages and disadvantages with a focus on the drying medium,temperature and residence time. The choice of drying technique is particularly important if the end-users choice of pellets is made due to the specific requirements for the heating system used. Some specific parameters were tested in order to investigate how the choice of drying technique affects the pellet quality. The parameters tested were moisture content and the emissions of volatile hydrocarbons. Pellets available on the market were chosen for the tests. The amount of volatile hydrocarbons left in sawdust after drying vary with drying technique, as emissions of terpenes are larger in dryers with long residence times. Low emissions of volatile hydrocarbons would improve the energy content of the sawdust, and by decreasing air pollution improve the work environment and the environment in the surroundings of the dryers
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