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Micro-Blog : Sharing and Querying Content Through Mobile Phones and Social Participation

Micro-Blog : Sharing and Querying Content Through Mobile Phones and Social Participation. - MobiSys 2008. By S. Gaonkar , J. Li, R. Choudhury , L. Cox, A. Schmidt. Presented by: Muhammad S. Karim. The Vision. A Virtual Information Telescope. What is the idea of Micro-blogging?.

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Micro-Blog : Sharing and Querying Content Through Mobile Phones and Social Participation

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  1. Micro-Blog: Sharing and Querying Content Through Mobile Phones and Social Participation - MobiSys 2008 By S. Gaonkar, J. Li, R. Choudhury, L. Cox, A. Schmidt Presented by: Muhammad S. Karim

  2. The Vision • A Virtual Information Telescope

  3. What is the idea of Micro-blogging? • Mobile-phone users record multimedia blogs on-the-fly using phone’s physical sensors (camera, voice, GPS, accelerometer etc.) • The micro-blogs are geo-tagged and uploaded in a remote server. • Server displays micro-blogs from around the world in a web-browser using a visualization service (e.g. Google maps) • The system provides content querying service.

  4. Services and Applications • Content Sharing • Users blog on mobile phones using video, audio, pictures, text etc. • Micro-Blog phone client geo-tags blog, upload to server over WiFi/GPRS/… • Micro-Blog server positions blog on Google-maps. • Internet users can explore and zoom on the maps. • Content Querying • Micro-Blog allows location specific queries. • Phones reply to query that are posted on to Google-map as a new micro-blog. • Content Floating • Metaphorically, virtual “sticky notes” floating in air. • Pushed on phones when user enters a region.

  5. Services and Applications (cont..) • Potential Applications: • Tourism • Micro-news • Micro-Alerts • Social Collaboration

  6. Research Problems? • Design considerations poses research problems: • How can the localization service be energy aware? • Energy-Accuracy tradeoff! • Incentives for participation? • Location privacy. • Content Inaccuracy and Spam (How to filter bad contents?).

  7. Design Considerations • Energy-Accuracy Tradeoff • Continuous GPS sinks major portion of energy.

  8. Design Considerations (cont..) • Solutions to achieve energy-efficient localization? • Multiplex between localization: GPS/WiFi/GSM. • Perform WiFi sampling by default. • Sample GPS location when no macro movement. • When movement, trigger infrequent WiFi: t(i) ,t(i+1) ,t(i+2) … • Location at t(i) is extrapolation from last GPS location at t(0)

  9. Design Considerations (cont..) • Incentives? • No incentives no reply to queries! • Credit system for queries? • Location Privacy? • 3 blogging modes proposed: • Public/Social/Private. • Users set privacy policy. • Content Inaccuracy and Spam? • Introduce configurations to allow level of tolerated distraction. • Use reputations to encourage content integrity.

  10. System Architecture Block diagram of the Micro-Blog software architecture

  11. System Implementation • 1. Phone Client • The software requires access to the a) location services, b) network services, c) file-system on the phone. • Maintains states to minimally interrupt the normal operations of the phone.

  12. System Implementation (cont..) • 2. Web-Infrastructure • Accepts TCP connection from phones. • Uses a relational DB in the backend (MySQL). • Web-application allows users to login, and: • a) Accept request for blogs from any region of the world, • b) Uses a visualization service that displays the blogs on Google maps, • c) Accepts user queries with marked regions and find phones in the DB that are associated with the region, • d) When a response arrives for a query, associate it with the query in DB and send response back to the query-originator.

  13. Evaluation • Localization error with a combined GPS and WiFi scheme: • More GPS samples offer diminishing returns • But energy cost increases linearly

  14. Prototype Ref: http://synrg.ee.duke.edu/microblog.html

  15. Limitations and Future Work • Credibility of the case-study performed. • only 12 users, and 1 type of phone. • Integration with a Social Network Application • make your own or use an exiting one? • Identification and filtering of false contents. • Exploiting Accelerometers for Localization.

  16. References: • Micro-Blog webpage at Duke’s SyNRG lab: • http://synrg.ee.duke.edu/microblog.html • Romit’s slides presented at @ MobiSys 2008

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