This shows you the differences between two versions of the page.
Next revision | Previous revision | ||
research:doforreal [2010/08/03 20:29] stijnm created |
research:doforreal [2010/08/04 17:34] tvcutsem shortened |
||
---|---|---|---|
Line 1: | Line 1: | ||
- | ==== Distributed Objects for Real ==== | ||
- | == Real Objects == | ||
- | |||
- | The widespread adoption of RFID tags provides a unique opportunity to equip physical objects with a digital presence. | ||
- | |||
- | One problem of note involves the power requirements of an RFID reader. | ||
- | |||
- | Anticipating the advent of mobile readers with an extended range of operation, the authors believe that it is crucial to devise mechanisms that allow application developers to deal with a situation where users carry mobile devices capable of detecting physical objects in their environment. | ||
- | |||
- | Prototype implementations of both models have been developed in AmbientTalk, | ||
- | |||
- | == Volatile Data Clouds == | ||
- | |||
- | The //volatile data clouds// model considers an RFID tag as data whose presence or absence can be used to steer the application. | ||
- | |||
- | The implicit and automatic propagation of change is achieved by borrowing ideas from // | ||
- | |||
- | When programing with reactive values that represent the collection of visible tags, the programming language needs to provide the following support. | ||
- | |||
- | Furthermore, | ||
- | |||
- | Most importantly, | ||
- | |||
- | == Tags Objects == | ||
- | |||
- | While the //volatile data clouds// model considers RFID tags as containers of data which is to be filtered and interpreted by the application, | ||
- | |||
- | When treating tags as objects, it is important to deal with the ephemeral nature of the connection between the mobile application and any particular tag. A first problem to be tackled is how applications detect new tags as they come into range. | ||
- | |||
- | Once a tag object has been discovered, the application can start to interact with it. However, if either the user of the application or the tagged object is roaming, it is extremely likely that the tag will (temporarily) go out of range. | ||
- | |||
- | While messages are implicitly buffered during a temporary disconnection, | ||
- | |||
- | Within the tag object model, we have conducted initial experiments on how to use ad hoc // | ||
- | |||
- | == Comparison == | ||
- | |||
- | Having implemented both models, it remains unclear whether one of the models presented in this paper is to be preferred over the other. | ||
- | |||
- | The volatile data clouds model treats RFID tags as simple containers of data and aims at providing applications with expressive means to represent a collection of nearby tags which is constantly in flux. Consequently, | ||
- | |||
- | The tag objects model on the other hand treats the contents of an RFID tag as a full-fledged object. | ||
- | |||
- | In all likelihood, a programming model that fully leverages the advantages of a world teeming with tagged objects will incorporate elements of both models presented here. | ||
- | |||
- | == Further Reading == | ||
- | |||
- | * Distributed Objects for Real. Stijn Mostinckx, Andoni Lombide Carreton, Kevin Pinte, Wolfgang De Meuter. Technical report, 2010, Vrije Universiteit Brussel [[|pdf]] |