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[–]ConferenceQA 0 points1 point ago

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Question: Dave Johnson, Rice University: As a designer of the Random Waypoint Model, I feel the need to defend it. It was never intended to model aggregate mobility at large scales [it was intended to model the motion of individual nodes].

Answer: [Agrees with limitations of proposed model in regard to tracking an individual node, proposal hybridized model that can enable tracking of individual nodes, as Waypoint was intended for]

Follow up: [Suggests considering work from MANET]

Question: What happens if you have a sparse city [how will less-dense regions be captured].

Answer: The model will pick work locations [that are not only in locations of highest density].

Question: New York tends to have lots of closure on mass transits, etc. Do you look for anomalies?

Answer: We can do "what-if" scenarios ...

Question: Based on CDR records, based on calls made or received, but not location of phones. You wouldn't necessarily find locations where people do not make calls.

Answer: Over large populations, and confirmed in ground-truth studies, we have show to capture statistics such as daily range against ground truth.

Question: Regarding future work on differential privacy, what does that mean, can you elaborate?

Answer: The idea in differential privacy, if you have a raw data set with real individuals and a synthetic set that you want to release, you want to prove that the synthetic data carries very little information [from an information theoretic perspective] regarding the real people.

Question: I was wondering, when you identified the home and work locations, did you use the call graph or just location? Do you think it would help to use the call graph?

Answer: We did not, we only used the CDR locations.

Question: [Regarding difference between LA, NY, and other cities, can you comment on the differences]

Answer: We also looked at San Francisco and other places as well.

Question: Would it make sense to compare data to IP based data? What if you had information regarding IP addresses of customers?

Answer: I very much hope that we can used the call detail records [mobile phones]. If we could use the data for IP communications, we would have, it would have added more information and improved our accuracy, I'm convinced.