19 citations · 50 across the 7 of their papers we have counts for
8 papers
Reliable Geofence Activation with Sparse and Sporadic Location Measurements: Extended Version
Kien Nguyen, John Krumm
Geofences are a fundamental tool of location-based services. A geofence is usually activated by detecting a location measurement inside the geofence region. However, location measu…
Gaussian Process for Trajectories
Kien Nguyen, John Krumm, Cyrus Shahabi
The Gaussian process is a powerful and flexible technique for interpolating spatiotemporal data, especially with its ability to capture complex trends and uncertainty from the inpu…
Quantifying Intrinsic Value of Information of Trajectories
Kien Nguyen, John Krumm, Cyrus Shahabi
A trajectory, defined as a sequence of location measurements, contains valuable information about movements of an individual. Its value of information (VOI) may change depending on…
Spatial Privacy Pricing: The Interplay between Privacy, Utility and Price in Geo-Marketplaces
Kien Nguyen, John Krumm, Cyrus Shahabi
A geo-marketplace allows users to be paid for their location data. Users concerned about privacy may want to charge more for data that pinpoints their location accurately, but may…
A Secure Location-based Alert System with Tunable Privacy-Performance Trade-off
Gabriel Ghinita, Kien Nguyen, Mihai Maruseac +1
Monitoring location updates from mobile users has important applications in many areas, ranging from public safety and national security to social networks and advertising. However…
A Privacy-Preserving, Accountable and Spam-Resilient Geo-Marketplace
Kien Nguyen, Gabriel Ghinita, Muhammad Naveed +1
Mobile devices with rich features can record videos, traffic parameters or air quality readings along user trajectories. Although such data may be valuable, users are seldom reward…
Los Angeles Metro Bus Data Analysis Using GPS Trajectory and Schedule Data (Demo Paper)
Kien Nguyen, Jingyun Yang, Yijun Lin +3
With the widespread installation of location-enabled devices on public transportation, public vehicles are generating massive amounts of trajectory data in real time. However, usin…
Differentially Private Publication of Location Entropy
Hien To, Kien Nguyen, Cyrus Shahabi
Location entropy (LE) is a popular metric for measuring the popularity of various locations (e.g., points-of-interest). Unlike other metrics computed from only the number of (uniqu…