![Page 1: Event Detection and Notification in the World-Wide Sensor Web Magdalena Balazinska with Evan Welbourne, Garret Cole, Nodira Khoussainova, Julie Letchner,](https://reader035.vdocuments.site/reader035/viewer/2022062423/5697bff01a28abf838cbaa79/html5/thumbnails/1.jpg)
Event Detection and Notification in the World-Wide Sensor Web
Magdalena Balazinska withEvan Welbourne, Garret Cole, Nodira Khoussainova, Julie Letchner,
Christopher Ré, Yang Li, Gaetano Borriello, and Dan Suciu
Computer Science & Engineering
University of Washington
http://rfid.cs.washington.edu/
![Page 2: Event Detection and Notification in the World-Wide Sensor Web Magdalena Balazinska with Evan Welbourne, Garret Cole, Nodira Khoussainova, Julie Letchner,](https://reader035.vdocuments.site/reader035/viewer/2022062423/5697bff01a28abf838cbaa79/html5/thumbnails/2.jpg)
RFID Ecosystem
Location trackingtag time location
… … …
Bob 10:02 B
A B C
Deployment
Bob 10:03 C
Bob 10:01 A
ReaderAntenna
Tag:
![Page 3: Event Detection and Notification in the World-Wide Sensor Web Magdalena Balazinska with Evan Welbourne, Garret Cole, Nodira Khoussainova, Julie Letchner,](https://reader035.vdocuments.site/reader035/viewer/2022062423/5697bff01a28abf838cbaa79/html5/thumbnails/3.jpg)
High-Level RFID Events
![Page 4: Event Detection and Notification in the World-Wide Sensor Web Magdalena Balazinska with Evan Welbourne, Garret Cole, Nodira Khoussainova, Julie Letchner,](https://reader035.vdocuments.site/reader035/viewer/2022062423/5697bff01a28abf838cbaa79/html5/thumbnails/4.jpg)
Our system: Cascadia
Applications
Standalone orTransformer
![Page 5: Event Detection and Notification in the World-Wide Sensor Web Magdalena Balazinska with Evan Welbourne, Garret Cole, Nodira Khoussainova, Julie Letchner,](https://reader035.vdocuments.site/reader035/viewer/2022062423/5697bff01a28abf838cbaa79/html5/thumbnails/5.jpg)
Event Specification: Scenic
![Page 6: Event Detection and Notification in the World-Wide Sensor Web Magdalena Balazinska with Evan Welbourne, Garret Cole, Nodira Khoussainova, Julie Letchner,](https://reader035.vdocuments.site/reader035/viewer/2022062423/5697bff01a28abf838cbaa79/html5/thumbnails/6.jpg)
Event Detection: PEEX
PeexL is translated into SQL SQL queries execute repeatedly Uses small, shifting time window
PEEXAt(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
At(…)
SQL Event Queries Results
event person room time prob
Coffee Bob 481 5 .63Break
Coffee Bob 481 14 .86Break
Coffee Bob 481 16 .87Break
COFFEE-BREAK(Bob,481,5,.64)
Event Stream to Applications
COFFEE-BREAK(Bob,481,14,.86)COFFEE-BREAK(Bob,481,16,.87)<no events this window>
… … … … …
And so on…
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Event Visualization: SensorMap
![Page 8: Event Detection and Notification in the World-Wide Sensor Web Magdalena Balazinska with Evan Welbourne, Garret Cole, Nodira Khoussainova, Julie Letchner,](https://reader035.vdocuments.site/reader035/viewer/2022062423/5697bff01a28abf838cbaa79/html5/thumbnails/8.jpg)
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More Information
Cascadia: A System for Specifying, Detecting, and Managing RFID Events. E. Welbourne, N. Khoussainova, J. Letchner, Y. Li, M. Balazinska, G. Borriello, and D. Suciu. Mobisys 2008.
Specification, Detection, and Notification of RFID Events with Cascadia (demo). E. Welbourne, G. Cole, N. Khoussainova, J. Letchner, Y. Li, M. Balazinska, G. Borriello, and D. Suciu. Mobisys 2008.
Event Queries on Correlated Probabilistic Streams. C. Re, J. Letchner, M. Balazinska, and D. Suciu. SIGMOD 2008.
A Demonstration of Cascadia through a Digital Diary Application (demo). N. Khoussainova, E. Welbourne, M. Balazinska, G. Borriello, G. Cole, J. Letcnher, Y. Li, C. Re, D. Suciu, and Jordan Walke. SIGMOD 2008.
PEEX: Extracting Probabilistic Events from RFID Data. N. Khoussainova, M. Balazinska, and D. Suciu. ICDE 2008.
http://rfid.cs.washington.edu/publications.html
![Page 10: Event Detection and Notification in the World-Wide Sensor Web Magdalena Balazinska with Evan Welbourne, Garret Cole, Nodira Khoussainova, Julie Letchner,](https://reader035.vdocuments.site/reader035/viewer/2022062423/5697bff01a28abf838cbaa79/html5/thumbnails/10.jpg)
Event Detection and Notification in the World-Wide Sensor Web
Magdalena Balazinska withEvan Welbourne, Garret Cole, Nodira Khoussainova, Julie Letchner,
Christopher Ré, Yang Li, Gaetano Borriello, and Dan Suciu
Computer Science & Engineering
University of Washington
http://rfid.cs.washington.edu/