1.Research Motivation 2.Existing Techniques 3.Proposed Technique 4.Limitations 5.Conclusion.

“Micro-Blog: Sharing and Querying Content through Mobile Phones and Social

Participation”

Outline

1. Research Motivation

2. Existing Techniques

3. Proposed Technique

4. Limitations

5. Conclusion

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

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

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

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

‣ 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

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

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

Client Server Architecture

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

Energy Accuracy Tradeoff

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

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

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

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