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Abstract. The goal of our work is to give a user equipped with an RFID-enabled mobile handset (mobile phone, PDA, laptop. . . ) the ability to know the contents of distant passive RFID tags, without physically moving to them and without using a Wireless Area Network. The existing architectural patterns involving passive tags do not meet simultaneously all of these requirements. Our RFID-based distributed memory does. By associating vector clocks to tags, we replicate a view of this memory on each tag and each handset, and disseminate updates between all of the replicas. Thus a user can locally query the replica hold by their mobile handset without physically moving to a tag. We have developed a pervasive game as an application example. Using data collected during real game sessions, we evaluate the performance of our distributed memory. Then we discuss staleness and scalability issues. We conclude and give perspectives of our work.

International audienceIn scientific visualization data are becoming more and more complex and implies cooperative effort for their post-processing analysis as well as high performance processing resources. Moreover experts are frequently geographically distributed and existing post-processing tools do not provide high performance capability with collaborative features. To solve this limitation, a prospective action has been recently initiated in the frame of the ANR SCOS project, with the development of a web based post-processing framework called V3D. SCOS/V3D is based on two innovating concepts: the sharing of the processing results via the transfer of a X3D data file corresponding to the final virtual reality scene and communications based on HTTP to by-pass standard proxies and firewalls limitations. To test this approach, a proof of concept prototype, called shareX3D, has been developed, especially focusing on the events notification, with an implementation of the long polling technique. The architecture of ShareX3D and first tests are presented and discusse

Abstract. "Plug: Secrets of the Museum" (PSM) is a game played with NFC-enabled mobile phones inside a museum containing dedicated passive RFID tags. During a PSM session, 8 teams exchange virtual cards representing objects located in the museum. These exchanges are done either with RFID tags or with other teams. PSM game design results in an educational and entertaining game which is much more attractive than the plain old treasure hunt proposed by several museums. Thus PSM is a good companion to discover and even take up a museum.

PLUG -Play Ubiquitous Games -, is a research project that deployed a fully distributed RFID architecture in the Museum of Arts and Crafts in Paris. A pervasive game was designed: "Plug: the Secrets of the Museum" (PSM) where players had to find virtual representations of the Museum artifacts, scatter them around or tidy them in the right spots, or swap them with other players. The analysis of the players' feed back showed that three main features characterize mobility when it is connected to pervasiveness. First, mobility appears as a way to read and collect information. Second, it is a tool to virtually mark the environment and the artifacts. Moving can be akin to "writing" a new scenario. Third, people become part of the network propagating and refreshing information not only on their mobiles but also on the RFID displays.