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  • baid 11:09 pm on March 28, 2012 Permalink | Reply  

    Confluence of mobile sensing and social sciences 

    I was recently drawn towards the growing use of mobile phone sensors and online social networks in understanding social behaviors. The Human Dynamics Group at MIT Media Labs seems to have a number of interesting projects on this topic. The following papers are quite related to things we discussed in the class and are very interesting to read:

    Social fMRI: Investigating and shaping social mechanisms in the real world

    Describes a mobile-phone-based social and behavioral sensing system and some initial results on how to use them to study the connection between individuals’ social behavior and their financial status, network effects in decision making. The implementation of mobile sensing is of particular interest: they develop a very easy to use open source framework called funf with which app developers can easily develop context sensing apps. The results are mostly preliminary: One shows that there is correlation between the common apps downloaded and the people you hang out with.

    How Many Makes a Crowd? On the Evolution of Learning as a Factor of Community Coverage

    This paper uses the framework from the paper above to constructed a SMS messages social network using info about more than 97,000 SMS messages sent. The aim is to predict each participants’ personal information by using their friends personal information. The results look quite impressive; the prediction accuracy for many attributes like religion, ethnicity, origin, age, etc. seems to be above 0.95. The title of the paper comes from their study on how the prediction accuracy is increased when the users sample set grows.

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    Quantifying Facebook friendships 

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  • baid 8:47 pm on March 14, 2012 Permalink | Reply  

    How about operator agnostic mobile services? 

    In the context of the class discussion on Q11 and Q12, here’s an interesting operation/business model that was proposed in a Mobicom’11 paper:

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    Now there seem to be two models that can be used, the first being described in the paper and the second being mentioned as unfeasible:

    1. Each provider broadcasts the set of parameters that are needed to make the decision on which operator to select, viz the current load and the price. Based on this info, each mobile device, on its own, selects the ‘best operator’ based on its location and application requirements.
    2. The service aggregator can potentially collect all the information from multiple providers and make this decision centrally. The tradeoff seems to be computational complexity vs. performance gain here.

    In either case, it seems like an interesting new operation model worth exploring more. Whether or not the operators would like such a model remains to be seen.

     

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  • baid 3:33 pm on February 20, 2012 Permalink | Reply  

    Startups in the TV White Space domain 

    A note on the burst of activities we saw after the TV White Space ruling by FCC: Seems like a number of companies were formed in the 2007-2010 period, though activities seem to have slowed down over the last 12 months or so. Opportunity for innovative wireless technology or another new tech bill killed by the politics: remains to be seen !

    While a host of big companies are already involved in various aspects of TV White Space (see a recent survey on TV White Space Cognitive Radio Patent portfolio); a stream of startups are emerging with an eye on the TVWS applications. Brief info on some of them:

    1. Spectrum Bridge: Formed in 2007, is leading the field trials for TVWS deployment and is one of the Database Admins assigned by FCC. Focus: database, application software, value added services, and full network deployment
    2. Adaptrum: Small Silicon Valley Startup, formed in 2004 with ties with UC Berkeley. Built one of the 1st White Space hardware for FCC approval along with the big players – Microsoft, Philips and Motorola. Focus seems to be hardware implementation but they also mention real-time resource monitoring, automated resource management, and self forming and optimizing networking capability in their company profile.
    3. Neul: UK based startup founded in 2010. Aims to use the TV White Space for machine-to-machine communication like smart-grid, asset tracking, vehicular systems, remote health monitoring etc. Team looks impressive, not much impact as yet.
    4. Key Bridge Global: A 2001 company which joined the TVWS bandwagon as a database administrator, though the revenue model is unclear for all the database providers. Have created a subsidiary called dsa, with some generic details about TVWS on the website for now.
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