Effect of vanadium precursor on dip-coated vanadium oxide thin films

The effect of chemical substances is reported on the structure, surface morphology, and material properties of vanadium oxide thin films. The study of the chemical substances concentrated on the effects of initial materials (e.g., NH 4 VO 3 , NaVO 3 , VO 2 , vanadyl acetylacetonate, ammonium decavanadate) and various additives (e.g., acids, chelate ligand, reduction reagent, and tensides). The syntheses are based on sol-gel chemistry. The important aim of the sol-gel technique was to optimize the chemical conditions such as catalyst and solvent for the preparation of perfect V 5+ -containing layers. The other aim was to check the controllability of the V 4+ /V 5+ ratios. The control was performed in the air by using a reducing agent and in a nitrogen atmosphere. The atomic and bond structures were investigated by 51 V MAS NMR, IR, and UV spectroscopies. The supramolecular structures were determined by SEM, EDX, and GIXRD techniques

Interface utilisateur tangible robotisée pour des interactions multimodales en réalité virtuelle

Les expériences en Réalité Virtuelle (RV) sont par essence multimodales : elles s’appuient sur les sens des utilisateurs. Néanmoins, l’intégration de l’Haptique - le sens du toucher - en RV reste complexe. L’objectif de cette thèse est de prodiguer du Retour Haptique cohérent, en permettant des Techniques d’Interaction intuitives dans les environnements virtuels. Je vise à laisser les utilisateurs effectuer des interactions dites "sans encombre" en RV - où les utilisateurs ne portent aucun appareillage - et promeus à cet égard la conception d’une Solution Haptique. Pour ce faire, je distingue l’intégration de l’Haptique en RV selon une approche triple : 1, J’étudie comment prodiguer des retours tactile et kinesthésique vraisemblables ; 2, Je décris les techniques d’interaction en RV, les tâches exécutées par les utilisateurs, et conçois de nouvelles méthodes les permettant. Je dérive ces deux premiers points pour apporter un Cadre d’Analyse avec des contributions méthodologiques. Je propose de nouvelles dimensions évaluant les interactions en RV via des solutions haptiques, et souligne le futur prometteur des Interfaces Haptiques à Contacts Intermittents. Je décris leurs spécifications, défis et opportunités - conceptuels et perceptuels ; 3, Je contribue ensuite à la conception et l’implémentation d’un artefact : une Interface Tangible Robotisée, CoVR. CoVR anticipe les intentions des utilisateurs intra- et inter-objets, et les encontre physiquement à l’objet d’intérêt de leur choix avant que l’interaction ne survienne. J’apporte enfin des contributions empiriques, via des évaluations techniques et d’usabilité de CoVR.Virtual Reality (VR) experiences are by essence multimodal: they heavily rely on the users’ senses. Yet, integrating Haptics - the sense of touch - in VR is a timely and challenging topic. The goal of this thesis is to provide consistent Haptic Feedback while enabling intuitive Interaction Techniques in Virtual environments. More specifically, I aim to let the users perform unencumbered interactions in VR - where they are free of any contraption - and promote the design of a Haptic Solution in these regards. To achieve this, I discriminate the Integration of Haptics in VR through a threefold approach : 1, I investigate how to provide believable fine tactile and large kinesthetic feedback ; 2, I depict interaction techniques in VR, the tasks users perform and draw novel methods to enable them. These enable me to draw an Analytical Framework with methodological contributions. This framework proposes novel dimensions to evaluate VR interactions via their associated Haptic Solutions, and emphasizes the promising future of Encountered-Type of Haptic Displays. It then depicts their specifications, challenges and opportunities from both conception and perception perspectives ; 3, I then provide artefact contributions, and propose the conception and design of a Robotised Tangible User Interface, CoVR. CoVR anticipates the users’ intentions both within- and between-objects, to physically encounter the users at their desired object of interest prior to interaction. This thesis finally provides empirical contributions, with technical and perceptual studies around CoVR

Interface utilisateur tangible robotisée pour des interactions multimodales en réalité virtuelle

Virtual Reality (VR) experiences are by essence multimodal: they heavily rely on the users’ senses. Yet, integrating Haptics - the sense of touch - in VR is a timely and challenging topic. The goal of this thesis is to provide consistent Haptic Feedback while enabling intuitive Interaction Techniques in Virtual environments. More specifically, I aim to let the users perform unencumbered interactions in VR - where they are free of any contraption - and promote the design of a Haptic Solution in these regards. To achieve this, I discriminate the Integration of Haptics in VR through a threefold approach : 1, I investigate how to provide believable fine tactile and large kinesthetic feedback ; 2, I depict interaction techniques in VR, the tasks users perform and draw novel methods to enable them. These enable me to draw an Analytical Framework with methodological contributions. This framework proposes novel dimensions to evaluate VR interactions via their associated Haptic Solutions, and emphasizes the promising future of Encountered-Type of Haptic Displays. It then depicts their specifications, challenges and opportunities from both conception and perception perspectives ; 3, I then provide artefact contributions, and propose the conception and design of a Robotised Tangible User Interface, CoVR. CoVR anticipates the users’ intentions both within- and between-objects, to physically encounter the users at their desired object of interest prior to interaction. This thesis finally provides empirical contributions, with technical and perceptual studies around CoVR.Les expériences en Réalité Virtuelle (RV) sont par essence multimodales : elles s’appuient sur les sens des utilisateurs. Néanmoins, l’intégration de l’Haptique - le sens du toucher - en RV reste complexe. L’objectif de cette thèse est de prodiguer du Retour Haptique cohérent, en permettant des Techniques d’Interaction intuitives dans les environnements virtuels. Je vise à laisser les utilisateurs effectuer des interactions dites "sans encombre" en RV - où les utilisateurs ne portent aucun appareillage - et promeus à cet égard la conception d’une Solution Haptique. Pour ce faire, je distingue l’intégration de l’Haptique en RV selon une approche triple : 1, J’étudie comment prodiguer des retours tactile et kinesthésique vraisemblables ; 2, Je décris les techniques d’interaction en RV, les tâches exécutées par les utilisateurs, et conçois de nouvelles méthodes les permettant. Je dérive ces deux premiers points pour apporter un Cadre d’Analyse avec des contributions méthodologiques. Je propose de nouvelles dimensions évaluant les interactions en RV via des solutions haptiques, et souligne le futur prometteur des Interfaces Haptiques à Contacts Intermittents. Je décris leurs spécifications, défis et opportunités - conceptuels et perceptuels ; 3, Je contribue ensuite à la conception et l’implémentation d’un artefact : une Interface Tangible Robotisée, CoVR. CoVR anticipe les intentions des utilisateurs intra- et inter-objets, et les encontre physiquement à l’objet d’intérêt de leur choix avant que l’interaction ne survienne. J’apporte enfin des contributions empiriques, via des évaluations techniques et d’usabilité de CoVR

"Let's Meet and Work it Out": Understanding and Mitigating Encountered-Type of Haptic Devices Failure Modes in VR

International audienceEncountered-type of Haptic devices (ETHD) are robotic interfaces physically overlaying virtual counterparts prior to a user interaction in Virtual Reality. They theoretically reliably provide haptics in Virtual environments, yet they raise several intrinsic design challenges to properly display rich haptic feedback and interactions in VR applications. In this paper, we use a Failure Mode and Effects Analysis (FMEA) approach to identify, organise and analyse the failure modes and their causes in the different stages of an ETHD scenario and highlight appropriate solutions from the literature to mitigate them. We help justify these interfaces' lack of deployment, to ultimately identify guidelines for future ETHD designers

Survey of Wearable Haptic Technologies for Navigation Guidance

Wearable haptic technologies, known as wearable haptics, instantiate physical contacts with users, either to confirm actions or to communicate a surrounding information-over a worn-type interface. Two factors require to be addressed for their design: the body locus-a function of comfort and sensitivity, and the types of stimuli they provide. Wearable haptics have gained great popularity in the last decade, thanks to their effectiveness, ease of use, and variety of application scenarios. This paper provides a non-exhaustive review of the state of the art on wearable haptics for navigation guidance. We classify the existing literature through two dimensions: (1) the body part they stimulate and (2) the haptic stimulation they provide through their actuation technology. We then analyze the navigation guidance strategies they adopt for communicating with the wearer, to finally identify challenges and limitations reflected in their evaluation protocols. Compromises are to be drawn when eliciting guidance through wearable haptics, between acceptability, cognitive workload, usability and accuracy

Survey of Wearable Haptic Technologies for Navigation Guidance

Wearable haptic technologies, known as wearable haptics, instantiate physical contacts with users, either to confirm actions or to communicate a surrounding information-over a worn-type interface. Two factors require to be addressed for their design: the body locus-a function of comfort and sensitivity, and the types of stimuli they provide. Wearable haptics have gained great popularity in the last decade, thanks to their effectiveness, ease of use, and variety of application scenarios. This paper provides a non-exhaustive review of the state of the art on wearable haptics for navigation guidance. We classify the existing literature through two dimensions: (1) the body part they stimulate and (2) the haptic stimulation they provide through their actuation technology. We then analyze the navigation guidance strategies they adopt for communicating with the wearer, to finally identify challenges and limitations reflected in their evaluation protocols. Compromises are to be drawn when eliciting guidance through wearable haptics, between acceptability, cognitive workload, usability and accuracy

Survey of Wearable Haptic Technologies for Navigation Guidance

Wearable haptic technologies, known as wearable haptics, instantiate physical contacts with users, either to confirm actions or to communicate a surrounding information-over a worn-type interface. Two factors require to be addressed for their design: the body locus-a function of comfort and sensitivity, and the types of stimuli they provide. Wearable haptics have gained great popularity in the last decade, thanks to their effectiveness, ease of use, and variety of application scenarios. This paper provides a non-exhaustive review of the state of the art on wearable haptics for navigation guidance. We classify the existing literature through two dimensions: (1) the body part they stimulate and (2) the haptic stimulation they provide through their actuation technology. We then analyze the navigation guidance strategies they adopt for communicating with the wearer, to finally identify challenges and limitations reflected in their evaluation protocols. Compromises are to be drawn when eliciting guidance through wearable haptics, between acceptability, cognitive workload, usability and accuracy

"Let's Meet and Work it Out": Understanding and Mitigating Encountered-Type of Haptic Devices Failure Modes in VR

International audienceEncountered-type of Haptic devices (ETHD) are robotic interfaces physically overlaying virtual counterparts prior to a user interaction in Virtual Reality. They theoretically reliably provide haptics in Virtual environments, yet they raise several intrinsic design challenges to properly display rich haptic feedback and interactions in VR applications. In this paper, we use a Failure Mode and Effects Analysis (FMEA) approach to identify, organise and analyse the failure modes and their causes in the different stages of an ETHD scenario and highlight appropriate solutions from the literature to mitigate them. We help justify these interfaces' lack of deployment, to ultimately identify guidelines for future ETHD designers