3 research outputs found
WSR: A WiFi Sensor for Collaborative Robotics
In this paper we derive a new capability for robots to measure relative
direction, or Angle-of-Arrival (AOA), to other robots operating in
non-line-of-sight and unmapped environments with occlusions, without requiring
external infrastructure. We do so by capturing all of the paths that a WiFi
signal traverses as it travels from a transmitting to a receiving robot, which
we term an AOA profile. The key intuition is to "emulate antenna arrays in the
air" as the robots move in 3D space, a method akin to Synthetic Aperture Radar
(SAR). The main contributions include development of i) a framework to
accommodate arbitrary 3D trajectories, as well as continuous mobility all
robots, while computing AOA profiles and ii) an accompanying analysis that
provides a lower bound on variance of AOA estimation as a function of robot
trajectory geometry based on the Cramer Rao Bound. This is a critical
distinction with previous work on SAR that restricts robot mobility to
prescribed motion patterns, does not generalize to 3D space, and/or requires
transmitting robots to be static during data acquisition periods. Our method
results in more accurate AOA profiles and thus better AOA estimation, and
formally characterizes this observation as the informativeness of the
trajectory; a computable quantity for which we derive a closed form. All
theoretical developments are substantiated by extensive simulation and hardware
experiments. We also show that our formulation can be used with an
off-the-shelf trajectory estimation sensor. Finally, we demonstrate the
performance of our system on a multi-robot dynamic rendezvous task.Comment: 28 pages, 25 figures, *co-primary author
Development and validation of a multigene variant profiling assay to guide targeted and immuno therapy selection in solid tumors.
We present data on analytical validation of the multigene variant profiling assay (CellDx) to provide actionable indications for selection of targeted and immune checkpoint inhibitor (ICI) therapy in solid tumors. CellDx includes Next Generation Sequencing (NGS) profiling of gene variants in a targeted 452-gene panel as well as status of total Tumor Mutation Burden (TMB), Microsatellite instability (MSI), Mismatch Repair (MMR) and Programmed Cell Death-Ligand 1 (PD-L1) respectively. Validation parameters included accuracy, sensitivity, specificity and reproducibility for detection of Single Nucleotide Alterations (SNAs), Copy Number Alterations (CNAs), Insertions and Deletions (Indels), Gene fusions, MSI and PDL1. Cumulative analytical sensitivity and specificity of the assay were 99.03 (95% CI: 96.54-99.88) and 99.23% (95% CI: 98.54% - 99.65%) respectively with 99.20% overall Accuracy (95% CI: 98.57% - 99.60%) and 99.7% Precision based on evaluation of 116 reference samples. The clinical performance of CellDx was evaluated in a subsequent analysis of 299 clinical samples where 861 unique mutations were detected of which 791 were oncogenic and 47 were actionable. Indications in MMR, MSI and TMB for selection of ICI therapies were also detected in the clinical samples. The high specificity, sensitivity, accuracy and reproducibility of the CellDx assay is suitable for clinical application for guiding selection of targeted and immunotherapy agents in patients with solid organ tumors