- 2017-02-21: Place Lab
Respond the following question briefly (2-3 sentences or a bulleted list):
The PlaceLab paper was written more than 10 years ago. What aspects of its design are still relevant today, and which aspects have been made obsolete by changes in technology?Please email your response to 6.s062-submit@mit.edu before class.
- 2017-02-22: Indoor Location
RADAR and Cricket are two indoor location systems. List two things in common between these two systems, and two things that are different.
Please email your response to 6.s062-submit@mit.edu before class.
- 2017-02-27: Gateway Problem
In your own words (don’t copy from the paper), in one or two sentences, explain what the “gateway problem” is, as illustrated by the paper “The Internet of Things Has a Gateway Problem”.
Please email your response to 6.s062-submit@mit.edu before class.
- 2017-03-01: ETX
Suppose we want to send data from node S to node T in a multi-hop wireless network. The probability of successfully receiving an ACK for a packet sent from S to T directly is q. The other choice is to use an intermediate node, N; the probability of successfully receiving an ACK for a packet from S to N is p, the same as the probability of successfully receiving an ACK for a packet sent from N to T.
Using ETX, under what conditions would the direct link from S to T be preferred to the path S — N — T?
Please email your response to 6.s062-submit@mit.edu before class.
- 2017-03-06: LEACH
As described in the LEACH paper, what is the maximum number of network hops (path length) between any sensor node and the base station? What assumption on the radios justifies your answer (i.e., explain your answer).
Please email your response to 6.s062-submit@mit.edu before class.
- 2017-03-08: TAG
Summarize in 1-2 sentences how the type of aggregation function used in the query affects the communication efficiency of TAG.
Please email your response to 6.s062-submit@mit.edu before class.
- 2017-03-15: Inertial Navigation
Describe two settings in which inertial sensing can be superior to/preferred over GPS for navigation applications.
Please email your response to 6.s062-submit@mit.edu before class.
- 2017-03-20: Activity Recognition
Based on the results in the paper, which pair of activities is hardest to tell apart? Based your understanding of how accelerometers work, why do you think this is the case?
Please email your response to 6.s062-submit@mit.edu before class.
- 2017-03-22: Pothole Patrol
A simple method to detect potholes would be to look at time windows during which the absolute magnitude of the acceleration vector is above some threshold. This will lead to a number of false positives, as described in the paper. After reading the paper, list two sources of such false positives, and how the paper proposes to address them.
Please email your response to 6.s062-submit@mit.edu before class.
- 2017-04-03: CTrack
Explain the problem that CTrack solves: i.e., what are the inputs to CTrack, and what are the outputs?
Please email your response to 6.s062-submit@mit.edu before class.
- 2017-04-05: Map Inference
In the paper by Biagioni and Eriksson, to find road centerlines, the authors develop a new gray-scale skeletonization method. This method iterates through binary skeletonization starting from the highest density level and proceeding downwards in density levels. Why does it produce a better result than using binary skeletonization once at a low density level?
Please email your response to 6.s062-submit@mit.edu before class.