An empirical study examined the effects of two influencing factors in usability tests on user performance and usability ratings. Aesthetics of design (high vs. low) as the main independent factor and prior usage event (positive vs. negative) as a subsidiary independent factor were varied in a between-participants design. 60 participants took part in the experiment, completing a number of typica...

We present a distributed framework where agents can share data along with usage policies. We use an expressive policy language including conditions, obligations and delegation. Our framework also supports the possibility to refine policies. Policies are not enforced a-priori. Instead policy compliance is checked using an a-posteriri auditing approach. Policy compliance is shown by a (logical) p...

Two classes of nominal automata, namely Usage Automata (UAs) and Variable Finite Automata (VFAs) are considered to express resource control policies over program execution traces expressed by a nominal calculus (Usages). We first analyse closure properties of UAs, and then show UAs less expressive than VFAs. We finally carry over to VFAs the symbolic technique for model checking Usages against ...

We operate on multiple simultaneous modes of sensory input, including hearing (sound), sight (graphics) and touch (interaction). These senses mutually reinforce each other and are essential in deriving expression, meaning and aesthetic appreciation when creating and experiencing media, art and design [1,2]. Of our senses, sight and hearing are most readily describable (and perhaps therefore mos...

Schools and artistic trends derive their themes from styles as methods followed by the artist to express his embodied in values of plastic elements symbols signs that can be described according type art school extent which is influenced employing them a goal achieve achievement painting, those vocabulary (human beings nature Life) encoded messages have an appearance interior, are forms, colors,...

Lighting design is an important topic of 3D scene design. There are many functions that lighting assumes in game environments, including directing attention, visibility, evoking emotions, setting atmosphere, and providing depth. Due to the unpredictability of interactive environments, current lighting design models do not adequately adapt the lighting to serve these aesthetic and communicative ...

Limited research exists on the hedonic dimensions of HCI and their relevance to usability and an even smaller set of this research is empirical in nature (Hoffman & Krauss, 2004; Schenkman & Jonsson, 2000; Zhang and Li, 2005). Furthermore, it appears that there are gender differences regarding perceptions of attractiveness, usability, and the consequent affective state of satisfaction, in websi...

background & purpose: a stroke occurs when blood flow to a region of the brain is interrupted by the blockage or rupturing of a blood vessel or artery. the most prevalent cause of aphasia is stroke. a brain damage that can effect on receptive & expressive language skills is aphasia. intensive language therapy is the most effective means of treating aphasia. the ciat is one of the novel intensiv...