Semantics in Sensor Networks

Semantics in Sensor Networks Workshop on Semantics and Future Internet Berlin, 1 Sep 2009 Oscar Corcho Facultad de Informática Universidad Politécnica de Madrid Campus de Montegancedo sn 28660 Boadilla del Monte, Madrid http://www.oeg-upm.net [email_address] Phone: 34.91.3366605 Fax: 34.91.3524819

Sensor Networks ,[object Object],[object Object],Source: Antonis Deligiannakis

Parts of a Sensor ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Source: Antonis Deligiannakis

Some examples of sensors and sensor parts ,[object Object],[object Object],[object Object],Source: Antonis Deligiannakis Passive RFID tag Berkeley Mica2 Stargate (Intel PXA255 cpu) Constraint Battery -- 2 ΑΑ Li-Ion Conserve to increase network lifetime CPU -- 7.38 MHz 400 MHz Computationally cheap algorithms Memory 1Kb 4KB SRAM, 512 KB EEPROM up to 256 MB FLASH Algorithms with low memory requirements Radio A few feet 30 0 μέτρα Depends on radio model Transmission range, bandwidth (bits/sec)

The Sensor Web ,[object Object],[object Object],[object Object],[object Object],Source: Adapted from Alan Smeaton’s invited talk at ESWC2009

Sensor Web: Is this part of the Web/Internet? Source: SemsorGrid4Env consortium

You haven’t done sensor networks research until... ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Source: Adapted from Dave de Roure

Energy Constraints ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Sources of Energy Drain ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Assumptions and Goals in Subsequent Algorithms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Who are the end users of sensor networks? Source: Dave de Roure The climate change expert, or a simple citizen

And what do these users want? ,[object Object],[object Object],[object Object],[object Object]

But why is it worth falling in mud? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Source: Dave de Roure

A set of challenges in sensor data management ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Source: Data Management in the WorldWide Sensor Web. Balazinska et al. IEEE Pervasive Computing, 2007

A semantic perspective on these challenges ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Final Discussion: Hot Topics and Open Problems

Challenges. A 1000-feet architectural perspective http://www.semsorgrid4env.eu/

Challenge 1: Querying and (pre-)processing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],29-30 Sep 2008 SemsorGrid4Env, Kick-Off, Madrid 0 2 1 3 4 5 6 7 8 9

SNEE as a Decision-Making Sequence ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SemsorGrid4Env, Kick-Off, Madrid routing parsing/type checking translation/rewriting algorithm assignment partitioning where-scheduling when-scheduling code generation <query, QoS-expectations>, <schemas, description(node,network), cost parameters> <N 1 , …, N m > nesC code abstract-syntactic tree logical-algebraic form physical-algebraic form PAF routing tree RT fragmented-algebraic form agenda 1 2 3 4 5 6 7 8 RT distributed-algebraic form RT DAF single-site phase multi-site phase

Challenge 1: Querying and (pre-)processing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Source: Antonis Deligiannakis

Challenge 1: Querying and (pre-)processing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Challenge 2: Sensor Data Modelling and Management ,[object Object],[object Object],[object Object],[object Object]

Challenge 2: Sensor Data Modelling and Management ,[object Object],SensorLocation:stored ( id:int , locx:int, locy:int) TreeSensor:sensed ( id:int , ts:time , smoke:boolean, temperature:float, relHumidity:float) SoilSensor:sensed ( id:int , ts:time , moisture:float) WindSensor:sensed ( id:int , ts:time , speed:float, direction:float) RainGauge:sensed ( id:int , ts:time , level:float) Streaming SPARQL, C-SPARQL, etc. Linked Stream Data (ISWC2009 semantic sensor wokshop) http://www.linkeddatastreams.org/sensor/heartrate/1/50.60242,-2.5225/1

Simple Query ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Semantically Integrating Streaming and Stored Data

Challenge 3: User Interaction with Sensor Data Source: SemsorGrid4Env consortium

Vision (after some iterations, and more to come) Source: RWI Working Group on IoT: Networked Knowledge Networked Knowledge Before 2010 2010-2015 2015-2020 Beyond 2020 Today Incremental Incremental-Visionary Visionary Interoperability ,[object Object],[object Object],[object Object],[object Object],[object Object],Information & Context ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Discovery ,[object Object],[object Object],[object Object],[object Object],Identity & Trust & Privacy ,[object Object],[object Object],[object Object],[object Object],[object Object],Provenance ,[object Object],[object Object],[object Object],[object Object]

Another list of R&D challenges ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Real World: Where do we talk about this? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],SemsorGrid4Env: Objectives http://www.semsorgrid4env.eu Start date: 01/09/2009 Duration: 36 months

SemsorGrid4Env: use cases ,[object Object],[object Object]

SemsorGrid4Env: Technologies and Expected Results ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Semantics in Sensor Networks

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