1.Research Motivation 2.Existing Techniques 3.Proposed Technique 4.Limitations 5.Conclusion.
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Transcript of 1.Research Motivation 2.Existing Techniques 3.Proposed Technique 4.Limitations 5.Conclusion.
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“Micro-Blog: Sharing and Querying Content through Mobile Phones and Social
Participation”
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Outline
1. Research Motivation
2. Existing Techniques
3. Proposed Technique
4. Limitations
5. Conclusion
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Characteristics of Mobile Phones
◦ Variety of sensors
◦ Wireless capability and increasing device density
◦ Aggregate sensory inputs from surroundings
◦ Human participation and social collaboration
◦ Distributed content sharing
Mobile Phone Platform
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People centric applications
Unlike Traditional Sensor networks◦ Participatory◦ Interactive◦ Scale of Human Users
Isolated impacts of distributed knowledge sharing (Wikipedia), social networks, sensor networks, and mobile communication.
More impact in their convergence to come up with novel applications.
Motivation
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Existing projects◦ Sensing the surrounding◦ Urban planning◦ Environment Monitoring◦ Healthcare◦ Location Aware information sharing
None of them exploits all features like◦ Social and sensor networking◦ Multimedia information exchange◦ Querying information of any type globally◦ Location specific information on a spatial
platform
Related Work
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Generalization of all the ideas with the characteristic to query mobile phones or users
Framework to query, browse and share location specific information globally
Four distinct components◦ Powerful phone sensors
GPS, accelerometers, Cameras etc◦ Wireless Network ◦ Information processing◦ Spatial Visualization
Micro-Blog
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‣ Senses data and distills the data through human participation
‣ Widely Deployable Service
‣ Several potential application
‣ Micro-News‣ Human opinions about topics of interest, or blogs on emergency
‣ Social Collaboration ‣ Applications on Micro-Blog may connect those who need services
to those who can offer them
‣ Micro-Health‣ Timeline of a person’s health conditions as blogged at different
time instants
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Phone users record multimedia blogs
Blogs associated with time and location
Localization service is consulted that meet application accuracy and energy requirement
Blogs uploaded to server and stored in Database
Server positions blog on a spatial platform(Maps)
Internet users can zoom into any part of mapand browse streaming content at those locations.
Working
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When user looking for specific information cannot find it, he can mark out a geographic location
Direct queries to phones located near it
Queries are serviced either through human or automatic sensing
Human responses to queries can be placed on maps
Server pushes location specific blogs to phones arriving in that location
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Client Server Architecture
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Resolve a tension between localization accuracy and battery lifetime
◦ GPS : good location accuracy, exhaust a lot of energy
◦ Wi-Fi: Improve battery lifetime but higher localization error
◦ GSM: Energy efficient but less accurate than the above
◦ Switching between different schemes to maintain balance
◦ Micro-Blog is geotagged, user experience depends on accurate matches between data and location
◦ However, accurate localization cannot come at cost of short battery lifetime
Technological Challenges
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Energy Accuracy Tradeoff
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Incentives for participation◦ Social networks and pool of free query credits
Privacy◦ Public, social and private mode
Spam◦ Restrict the number of queries
Content Inaccuracy◦ Users can be assigned reputations
◦ Below a threshold reputation, microblogs from that user is not published.
◦ Identify misbehaving user overtime
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Location-privacy◦ Users reluctant to expose locations
User movements are estimated through changes in Wi-Fi or GSM which are low accuracy indicators◦ Utilizing accelerometer readings for improvements
Micro-Blog not practical to initiate a new social network◦ Features dependent on pre-established network
Limitations
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Security concerns in real time decision making◦ Intelligent attacker maintains reputation and misleads
Study on a larger cross-section of population◦ Study conducted on a set of 12 individuals◦ Needs to be more conclusive
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Micro-Blog is evaluated by building and deploying a prototype implementation
Experience of users is positive
With energy efficient localization technique, Micro-Blog represents a promising new model for social collaboration
Conclusion