Research Area
Year Published

38 Results

May 19, 2019

Facebook Disaster Maps: Aggregate Insights for Crisis Response & Recovery

Conference on Information Systems for Crisis Response and Management (ISCRAM)

In this paper, we describe the data and methodology that power Facebook Disaster Maps. These maps utilize information about Facebook usage in areas impacted by natural hazards, producing aggregate pictures of how the population is affected by and responding to the hazard. The maps include insights into evacuations, cell network connectivity, access to electricity, and long-term displacement.

By: Paige Maas, Shankar Iyer, Andreas Gros, Wonhee Park, Laura McGorman, Chaya Nayak, Alex Dow

December 8, 2018

From Satellite Imagery to Disaster Insights

AI for Social Good Workshop at NeurIPS 2018

The use of satellite imagery has become increasingly popular for disaster monitoring and response. After a disaster, it is important to prioritize rescue operations, disaster response and coordinate relief efforts. These have to be carried out in a fast and efficient manner since resources are often limited in disaster affected areas and it’s extremely important to identify the areas of maximum damage. However, most of the existing disaster mapping efforts are manual which is time-consuming and often leads to erroneous results.

By: Jigar Doshi, Saikat Basu, Guan Pang

November 27, 2018

Machine Learning for Reliable mmWave Systems: Blockage Prediction and Proactive Handoff

IEEE Global Conference on Signal and Information Processing (GlobalSIP)

The sensitivity of millimeter wave (mmWave) signals to blockages is a fundamental challenge for mobile mmWave communication systems. The sudden blockage of the line-of-sight (LOS) link between the base station and the mobile user normally leads to disconnecting the communication session, which highly impacts the system reliability. Further, reconnecting the user to another LOS base station incurs high beam training overhead and critical latency problem. In this paper, we leverage machine learning tools and propose a novel solution for these reliability and latency challenges in mmWave MIMO systems

By: Ahmed Alkhateeb, Iz Beltagy, Sam Alex

October 12, 2018

Flight Control System Design for a High Altitude, Long Endurance Airplane: Sensor Distribution and Flexible Modes Control

This manuscript outlines the control system design process for a solar-powered unmanned high-altitude long endurance flying wing aircraft, called Aquila, which was developed by the Facebook Connectivity Lab to serve as communication backhaul for remote and rural connectivity.

By: Hamidreza Bolandhemmat

October 12, 2018

Energy-Optimized Trajectory Planning for High Altitude Long Endurance (HALE) Aircraft

This paper outlines the energy-optimized trajectory planning problem for high altitude, long endurance (HALE) aircraft and explores both offline and online optimization techniques to address it.

By: Hamidreza Bolandhemmat, Jack Marriott, Benjamin Thomsen

October 9, 2018

Trajectory Optimization of Solar-Powered High-Altitude Long Endurance Aircraft

Solar-powered high-altitude long endurance aircraft that harvest and store solar energy can fly indefinitely if they are able to close a 24-hour energy cycle. Perpetual endurance is possible when energy consumption does not exceed energy storage.

By: Jack Marriott, Birce Tezel, Zhang Liu, Nicolas Stier

October 1, 2018

Low-Dose-Rate Cobalt-60 Testing Results for Kaman KD-5100 Differential Inductive Position Measuring Systems

Journal, IEEE Radiation Effects Data Workshop (REDW)

We report 60Co gamma radiation testing of a Kaman KD-5100 position measuring system to a total ionizing dose of 10 kRad(Si) at a rate of 5 mRad(Si)/s.

By: Bart McGuyer, Randall Milanowski, Slaven Moro

September 4, 2018

Self-Supervised Feature Learning for Semantic Segmentation of Overhead Imagery

British Machine Vision Convention (BMVC)

In this work, we study various self-supervised feature learning techniques for semantic segmentation of overhead imageries.

By: Suriya Singh, Anil Batra, Guan Pang, Lorenzo Torresani, Saikat Basu, Manohar Paluri, C.V. Jawahar

July 18, 2018

Total Ionizing Dose Assessment of a Commercial 200V PMOSFET

IEEE Nuclear & Space Radiation Effects Conference (NSREC)

Total ionizing dose testing of commercial 200 V PMOSFETs. At 100 kRad(Si), observed VT increase of ~ 3 V for biased ON devices and increase of ~ 1 V for biased OFF devices. The RDS_ON did not degrade with dose.

By: Raichelle Aniceto, Randall Milanowski, Slaven Moro, Norman Hall, Bert Vermeire, Josh Shields, Kerri Cahoy

June 25, 2018

Deep Learning Coordinated Beamforming for Highly-Mobile Millimeter Wave Systems

IEEE Access 2018

Supporting high mobility in millimeter wave (mmWave) systems enables a wide range of important applications such as vehicular communications and wireless virtual/augmented reality. Realizing this in practice, though, requires overcoming several challenges.

By: Ahmed Alkhateeb, Sam Alex, Paul Varkey, Ying Li, Qi Qu, Djordje Tujkovic