Live action role-playing games share a range of characteristics with massively multiplayer online games (MMOGs). Because these games have existed for more than 20 years, players of these games have a substantial amount of experience in handling issues pertinent to MMOGs. Survey and review of live action role-playing games, whose participant count can be in the thousands, reveal that features su...

Access control is a main security issue in the management of complex information systems as well as Multi-agent Systems (MAS). In this paper we discuss the application of the Role-Based Access Control (RBAC) model in the context of TuCSoN coordination infrastructure for MAS. RBAC models and their extensions are currently considered the most effective approach for engineering access control in c...

BACKGROUND Colour is a consequence of the optical properties of an object and the visual system of the animal perceiving it. Colour is produced through chemical and structural means, but structural colour has been relatively poorly studied in plants. SCOPE This Botanical Briefing describes the mechanisms by which structures can produce colour. In plants, as in animals, the most common mechani...

According to the Dualistic Model of Passion, two forms of passion can motivate a behavior: harmonious passion and obsessive passion. Across various life activities, studies have found that the two forms of passion show different relationships with affect, linking harmonious passion to positive affect and obsessive passion to negative affect. To investigate if this pattern also holds for online ...