Le procédé d'élaboration par chauffage des composites à matrice thermodurcissable est limité par les temps caractéristiques correspondant à la diffusion de la chaleur ; l'utilisation du chauffage par hystérésis diélectrique a montré la solution qu'il était possible d'apporter à cette limitation. Toutefois, la réduction de la durée de l'opération thermique est fonction de la mise forme du matériau résultant du fluage de la matière.<br />La thèse comprend :<br />- premièrement les analyses électromagnétiques, chimique et thermique des conditions de mise en uvre du chauffage par hystérésis diélectrique pour des objets en matériau composite à fibres de verre unidirectionnelles,<br />- deuxièmement les caractérisations physiques et chimiques de la matrice (résine époxydique associée au durcisseur) en fonction de la température et en fonction des paramètres de son écoulement. Ces caractérisations comprennent la mesure de viscosité, la mesure de l'avancement de la réaction par DSC, les caractérisations diélectriques, la caractérisation des mélanges réactifs par GPC,<br />- troisièmement, l'application de ces analyses à la maîtrise du procédé.<br />La thèse conduit à une synthèse de l'ensemble des paramètres physiques et à leurs interdépendances pendant la mise en forme des matériaux.

<p>Syftet med denna studie var att undersöka hur väl tvåspråkiga elever i årskurs 9 behärskade vanligt förekommande idiomatiska uttryck i skrivet språk. Tre faktorer som enligt tidigare studier visat sig påverka idiomförståelse är; semantisk transparens, om uttrycket står i en kontext samt tidigare kännedom om uttrycket. Läsförmågan kontrollerades med ett standardiserat avkodnings- och läsförståelsetest, och idiomförståelsen testades utifrån ett test med 45, främst transparenta frekventa idiomatiska uttryck, isolerade respektive i en kontext. Resultaten visade att typ av tvåspråkighet och nivå på läskunnighet påverkade idiomförståelsen. De successivt tvåspråkiga med svenska som andraspråk klarade inte av att använda kontexten vid tolkningen i lika hög grad som de simultant tvåspråkiga och successivt tvåspråkiga med svenska som förstaspråk. Däremot presterade båda grupperna bäst vid tolkningen av idiomatiska uttryck som de hade kännedom om sedan tidigare. Enligt utvecklingsmodellen, global elaboration model (GEM) börjar utvecklingsprocessen för figurativ kompetens i 8 årsåldern hos enspråkiga barn. Enligt resultaten i denna studie kunde successivt tvåspråkiga med svenska som andraspråk i årskurs 9 jämföras med enspråkiga barn i 7-8 årsåldern, medan gruppen med simultant tvåspråkiga och successivt tvåspråkiga med svenska som förstaspråk, kunde jämföras med enspråkiga barn mellan 9-12 år.</p>

The thesis proposes a number of techniques for elaborating requirements constructively from high-level goals. The techniques are based on the KAOS goal-oriented method for requirements engineering. This method consists in identifying goals and refining them into subgoals until the latter can be assigned as responsibilities of single agents such as humans, devices and software. Domain properties and assumptions about the software environment are also used during the goal refinement process. The method supports the exploration of alternative goal refinements and alternative responsibility assignments of goals to agents. It also supports the identification and resolution of conflicts between goals, and the identification and resolution of exceptional agent behaviors, called obstacles, that violate goals and assumptions produced during the goal refinement process. The thesis enriches the KAOS framework through three kinds of techniques: (a) techniques for identifying agents, goal refinements, and alternative responsibility assignments, and for deriving agent interfaces from such responsibility assignments; (b) techniques for deriving operational requirements from goal specifications; (c) techniques for generating obstacles to the satisfaction of idealized goals and assumptions, and for generating alternative obstacle resolutions. The result is a coherent body of systematic techniques for requirements elaboration that are both theoretically well-founded (a formal model of agent is defined) and effective in practice (the techniques are validated on two real case studies of significant size: the London ambulance despatching system, and the Bay Area Rapid Transit train system).

Thesis (Ph.D. (Consumer Science))--North-West University, Potchefstroom Campus, 2008.

The thesis proposes a number of techniques for elaborating requirements constructively from high-level goals. The techniques are based on the KAOS goal-oriented method for requirements engineering. This method consists in identifying goals and refining them into subgoals until the latter can be assigned as responsibilities of single agents such as humans, devices and software. Domain properties and assumptions about the software environment are also used during the goal refinement process. The method supports the exploration of alternative goal refinements and alternative responsibility assignments of goals to agents. It also supports the identification and resolution of conflicts between goals, and the identification and resolution of exceptional agent behaviors, called obstacles, that violate goals and assumptions produced during the goal refinement process. The thesis enriches the KAOS framework through three kinds of techniques: (a) techniques for identifying agents, goal refinements, and alternative responsibility assignments, and for deriving agent interfaces from such responsibility assignments; (b) techniques for deriving operational requirements from goal specifications; (c) techniques for generating obstacles to the satisfaction of idealized goals and assumptions, and for generating alternative obstacle resolutions. The result is a coherent body of systematic techniques for requirements elaboration that are both theoretically well-founded (a formal model of agent is defined) and effective in practice (the techniques are validated on two real case studies of significant size: the London ambulance despatching system, and the Bay Area Rapid Transit train system).

This study sought to expand current narrative persuasion models by examining the role of subtext processing. The extended elaboration likelihood model suggests that transportation leads to persuasion by reducing counterarguments to stories’ persuasive subtexts. The model implicitly argues that transportation should reduce total subtext processing, including counterarguments and intended elaboration. But this study reasoned that people with stronger eudaimonic motivation to have meaningful entertainment experiences, would put more effort into processing stories’ subtexts while engaging with the narrative. Because less eudaimonically motivated individuals may be at risk for missing the subtext, it was also expected that adding a supplemental conclusion scene that reiterates the intended message would facilitate persuasion.Following a pre-test survey, 201 undergraduate students were randomly assigned to view an episode of the crime drama Numb3rs: one of two versions of “Harvest,” designed to promote organ donation (with or without a conclusion scene), or a control episode. After viewing, participants completed a thought-listing task and second survey. Results show that “Harvest” did not result in persuasive outcomes related to organ donation. Transportation was a marginally significant positive predictor of total subtext processing. Contrary to predictions, eudaimonic motivation negatively predicted amount of total subtext processing.Eudaimonic motivation also negatively (but marginally) predicted doctor mistrust, but this effect was moderated by conclusion condition: eudaimonic motivation was negatively associated with doctor mistrust only in the no conclusion condition. Eudaimonic motivation was also negatively (but marginally) associated with intended elaboration. Further examination showed that, compared to people with low eudaimonic motivation, those with high eudaimonic motivation were less likely to engage in intended elaboration, but only in the no conclusion condition. This pattern of findings provides indirect evidence that intended elaboration was responsible for decreasing doctor mistrust among people with high eudaimonic motivation who saw the conclusion. But surprisingly, intended elaboration was not directly related to any persuasive outcomes.The findings tentatively suggest that transportation and subtext processing can coexist and that eudaimonic motivation can affect the extent to which viewers engage in subtext processing during narrative engagement. The results also indicate that supplemental conclusions may be useful tools for narrative persuasion.

Tidigare forskning har visat att individer tenderar se sig själva mindre sårbara än genomsnittet, vilket gör att man utsätter sig själv för ett stort risktagande. Syftet med studien var att undersöka om de individer som ser sig mindre sårbara än andra är de som påverkas av reklam och manipulation. I undersökningen deltog 183 studenter, 122 kvinnor och 61 män. Tre olika mätinstrument kombinerades i en enkät. En reklamannons med tillhörande frågor, utarbetad i samarbete med en reklambyrå, ett instrument som mätte en individs Need for Cognition samt ett tredje för att mäta hur sårbar personen såg sig i jämförelse med genomsnittet. Våra hypoteser fick inte stöd men vi lyckades påvisa att det förekom en illusion av osårbarhet och en tredjepersoneffekt bland deltagarna. Förhoppningen är att framtida forskning lyckas ta fram ett mer effektivt mätinstrument som kan visa att illusionen av osårbarhet kan öka en individs manipulationsrisk.

Purchasing products from online e-stores is getting popular with the advance of Internet infrastructure and network security. At current stage, most e-stores resemble vending machines rather than real stores because they lack clerks to persuade prospects into buying products and to bargain with the customers for making a good deal. This research aims to design an easy-to-use and autonomous sales-agent, called Isa, to act as a virtual clerk in an e-store. A new approach is proposed to enable the agent to dynamically adopt different persuasion and negotiation strategies according to different characteristics of human buyers. Additionally, this approach enables a sales-agent to learn the best strategies without seller¡¦s instructions. Both laboratory and field experiments are conducted to assess Isa¡¦s performance. The experimental results reveal that Isa can improve a seller¡¦s surplus and increase a buyer¡¦s product evaluation, willingness to pay more money for the product, and satisfaction with visiting the s-store.

Since its commencement, the radio industry has been facing challenges from new media such as TV and later, the Internet. Nowadays, radio is widely regarded as a traditional medium that is fading away. However, the audio-oriented media feature of radio endows itself with a unique niche that could not be replaced by other video media. That is why radio advertisements are especially favored by advertisers. This research applies the Elaboration Likelihood Model (ELM) to radio advertising research, aiming to deliberate the persuasion effect of radio advertisements, which would be one of the few advertising-related studies in our country recently. This research utilizes the experimental method, a 2 (strong or weak argument quality) by 2 (reliable or attractive communicator quality) between-subject factorial design. 160 participants were randomly assigned to 4 experimental conditions, each with different stimulus of experimental ads. In addition, this study considers the degree of involvement with the advertised product as the mediating variable. In this research, the results shows that high-involvement subjects are mainly influenced by the argument quality in the radio ads. When high-involvement subjects are exposed to ads with strong argument quality, better evaluations on the ads , brands, credibility and cognition are generated. In addition, in the research both high-involvement or low-involvement subjects are not obviously influenced by communicator quality factors. However, if the advertisement takes an approach combining strong argument quality with a reliable communicator, high-involvement subjects would generate better attitudinal evaluations on the ads and brands. It is interesting that the advertisement shows an attractive female, the males would generate higher evaluation on brands attitude, credibility, behavior intention about this advertisement.

An electronic advice network provides employees opportunities to tap diverse experts within the organization at an unprecedented speed and scale. It is formed when an advice seeker initiates an online discussion thread joined by members of various communities, each specializing in a specific domain. This dissertation recognizes the substantial gap in our understanding of how to best harness the performance potential of expertise diversity provided through an electronic advice network within a firm. It thus investigates the process by and conditions under which expertise diversity in an electronic advice network promotes the advice seeker’s learning and performance. A field study was conducted via multi-methods including observation, interviews, and survey at a global company running discussion forums spanning internal virtual communities. The unit of analysis was at the discussion thread level. 190 discussion threads comprising 1,200 participants and associated outcomes (rated by their respective advice seekers) were analyzed. Findings suggest that, for the seeker to realize the performance potential of diverse inputs, discussion participants should facilitate the seeker’s learning by engaging in collective elaboration—articulating the differences and relevance of their diverse inputs. The seeker learned and performed the least when discussion participants were highly diverse but did not engage in collective elaboration. Discussion participants engaged in collective elaboration to the extent that they had previously established shared syntactic and semantic understanding of each other’s expertise domains through participation in each other’s communities. This dissertation contributes to the virtual communities literature by unearthing the relationships between expertise diversity and the advice seeker’s learning and performance and explaining when and how the seeker benefits from the diverse knowledge shared through an electronic advice network. The moderating role of collective elaboration explains why prior research may have found no or even a negative relationship between expertise diversity and discussion outcomes. It also contributes to the team literature by offering boundary conditions for the previous findings on expertise diversity and common ground. The collective elaboration construct can be also adopted by team diversity researchers to better understand where a disruption in the chain of group-level information processing may occur in some diverse teams. / text