Background: Previous research has shown that body image can have an impact on wellbeing. A negative body image can increase psychological suffering and have physical implications on health. A positive body image can provide protection against external factors that could lead to a negative body image. Aim: The aim of the study is to explore high school students body image and which situations and environments that has an impact on their body image. Method: The study was conducted through a qualitative method with semi structured interviews, the high school students was in the age range of 15-18. The data was gathered without any pre decided codes for analyzing. Result: The study showed that body image was not static within the high school students, body image could change from day to day and from situation, often depending on the mood. Negative body image could have effect on wellbeing overall, like thinking less of themselves, and also limit the high school students in their everyday life. Most high school students felt strongly that the body is something that you can control, with the right amount of motivation, physical activity and limited food intake, everybody could achieve their dream body. Social media had a negative impact on many of the high school students but could, for some work as a way of controlling what images they meet by unfollowing accounts that made them feel bad about themselves. Conclusion: The result of this study shows that body image can be fluid and strongly affected on the situation. Further research, focusing on what influences body image in this specific target group, could have a great impact on future interventions to improve body image. / Bakgrund: Tidigare forskning visar att kroppsuppfattning kan påverka välmående. En negativ kroppsuppfattning kan medföra psykiskt lidande och fysiska konsekvenser för hälsan. En positiv kroppsuppfattning kan medföra ett skydd mot yttre påverkansfaktorer som skulle kunna leda till en negativ kroppsuppfattning. Syfte: Studiens syfte är att undersöka gymnasieelevers kroppsuppfattning samt vilka situationer och miljöer som har en påverkan på deras kroppsuppfattning. Metod: Studien har genomförts med kvalitativ metod i form av semistrukturerade intervjuer där 10 gymnasieelever i åldersgruppen 15–18 fått representera resultatet. Analys skedde löpande under insamling av data enligt induktiv ansats där koderna tog form under arbetets gång. Resultat: Sammanfattningsvis visar resultatet att gymnasieeleverna kunde känna både positiva och negativa känslor inför den egna kroppen, där kroppsuppfattning kunde variera beroende på situation, dagsform samt umgänge. En negativ kroppsuppfattning kunde begränsa i vardagen genom undvikande beteende men det kunde även påverka tankemönster och däri skapa lidande. Kroppen ansågs vara något som kan kontrolleras och förändras med rätt motivation, träning och mat. Sociala medier påverkade negativt i stor utsträckning men kunde även fungera som ett skydd där gymnasieeleverna tog aktiva val om att avfölja konton som påverkade negativt och följa konton med normbrytande kroppar. Konklusion: Resultatet visar att kroppsuppfattning inte är något statiskt utan varierar kraftigt mellan individer och tillfällen. Vidare forskning rörande påverkansfaktorer hos målgruppen skulle kunna förbättra utsikten för framgångsrika interventioner för att förbättra kroppsuppfattningen.

Des spécificités de la technologie SOI partiellement désertée (PD-SOI), comme son gain en vitesse, et l'isolation diélectrique des transistors, sont intéressantes pour la conception d'interfaces entrées/sorties. Toutefois, l'emploi de cette technologie conduit à des phénomènes indésirables tels que l'effet d'histoire, une consommation statique accrue et l'effet d'auto-échauffement. Dans ce travail, une analyse de ces effets a été menée. L'influence de l'auto-échauffement s'est révélée négligeable. Un schéma électrique employant un mécanisme de polarisation active a été proposé afin de supprimer l'effet d'histoire et de contrôler la consommation statique tout en conservant un gain en vitesse. Le circuit de test, en 65nm PDSOI de STMicroelectronics, montre que la solution proposée permet d'améliorer la gigue du temps de propagation lors d'une transmission. La deuxième partie de ce travail s'intéresse à la technologie SOI totalement désertée (FDSOI). Cette dernière apporte un meilleur contrôle électrostatique des transistors et un degré de liberté supplémentaire en conception par le contrôle de leurs tensions de seuil via la face arrière. Dans un premier temps, cette caractéristique a été validée pour les entrées/sorties sur un circuit fabriqué en 28nm FDSOI de STMicroelectronics. Elle a été ensuite exploitée pour la calibration de l'impédance de sortie d'une interface LPDDR2 et la compensation des fluctuations environnementales. La solution proposée dans ce travail tire profit de la modulation par face arrière pour réaliser la calibration durant la transmission, contrairement à l'état de l'art, ce qui a pour effet d'augmenter la bande passante. / The characteristics of Partially-Depleted SOI (PD-SOI) technology, as its speed improvement and the dielectric isolation of the transistors, turn to be interesting for input/output interface. However, using this technology leads to side effects, such as history effect, higher static consumption and self-heating effect. In this work, an analysis of these effects was carried out. Self-heating appears to be negligible. To address the two other effects, a solution with active body control has been proposed in order to suppress the history effect and to reduce the static consumption while keeping the speed improvement. The test chip, processed in PDSOI 65nm from STMicroelectronics, shows that the proposed solution improves the jitter during transmission. The second part of this work involves Fully-Depleted SOI (FD-SOI) technology. This technology brings a better electrostatic control of transistors and an additional degree of freedom for circuit design, thanks to threshold voltage control through back biasing. First, this feature has been validated on input/output circuit processed in FD-SOI 28nm from STMicroelectronics. Then, back biasing has been exploited for output impedance calibration and for environmental fluctuation compensation, based on LPDDR2 standard. The proposed solution in this work takes benefit of the impedance modulation through back biasing in order to perform the calibration during transmission, as opposed to the state-of-the-art techniques. Thus, the overall communication data rate increases.