01919nas a2200241   4500000000100000000000100001008004100002260001200043653001300055653002900068653002000097653001600117100002400133700001900157700002200176700001900198245008900217856009800306300001000404490000600414520124300420022001401663       2012                            d  c12/201210aPatterns10aWireless Sensor Networks10aSensor Networks10aInteraction1 aMaria Cecilia Gomes1 aHervé Paulino1 aAdérito Baptista1 aFilipe Araújo00aAccessing Wireless Sensor Networks Via Dynamically Reconfigurable Interaction Models  uhttp://www.ijimai.org/journal/sites/default/files/files/2012/11/ijimai20121_7_6_pdf_26241.pdf  a52-610 v13 aThe Wireless Sensor Networks (WSNs) technology is already perceived as fundamental for science across many domains, since it provides a low cost solution for environment monitoring. WSNs representation via the service concept and its inclusion in Web environments, e.g. through Web services, supports particularly their open/standard access and integration. Although such Web enabled WSNs simplify data access, network parameterization and aggregation, the existing interaction models and run-time adaptation mechanisms available to clients are still scarce. 
Nevertheless, applications increasingly demand richer and more flexible accesses besides the traditional client/server. For instance, applications may require a streaming model in order to avoid sequential data requests, or the asynchronous notification of subscribed data through the publish/subscriber. Moreover, the possibility to automatically switch between such models at runtime allows applications to define flexible context-based data acquisition. To this extent, this paper discusses the relevance of the session and pattern abstractions on the design of a middleware prototype providing richer and dynamically reconfigurable interaction models to Web enabled WSNs.
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