More Like this

1. The transition model of RTK activation: A quantitative framework for understanding RTK signaling and RTK modulator activity

   https://doi.org/10.1016/j.cytogfr.2019.10.004  

   Paul, Michael D.; Hristova, Kalina (October 2019, Cytokine & Growth Factor Reviews)
2. Cloud-Based Single-Frequency Snapshot RTK Positioning

   https://doi.org/10.3390/s21113688  

   Liu, Xiao; Ribot, Miguel Ángel; Gusi-Amigó, Adrià; Rovira-Garcia, Adria; Sanz, Jaume; Closas, Pau (June 2021, Sensors)

   With great potential for being applied to Internet of Things (IoT) applications, the concept of cloud-based Snapshot Real Time Kinematics (SRTK) was proposed and its feasibility under zero-baseline configuration was confirmed recently by the authors. This article first introduces the general workflow of the SRTK engine, as well as a discussion on the challenges of achieving an SRTK fix using actual snapshot data. This work also describes a novel solution to ensure a nanosecond level absolute timing accuracy in order to compute highly precise satellite coordinates, which is required for SRTK. Parameters such as signal bandwidth, integration time and baseline distances have an impact on the SRTK performance. To characterize this impact, different combinations of these settings are analyzed through experimental tests. The results show that the use of higher signal bandwidths and longer integration times result in higher SRTK fix rates, while the more significant impact on the performance comes from the baseline distance. The results also show that the SRTK fix rate can reach more than 93% by using snapshots with a data size as small as 255 kB. The positioning accuracy is at centimeter level when phase ambiguities are resolved at a baseline distance less or equal to 15 km. 

   more » « less
3. RTK Feasibility Analysis for GNSS Snapshot Positioning

   https://doi.org/10.33012/2020.17768  

   Liu, Xiao; Ribot, Miguel Ángel; Gusi-Amigó, Adrià; Closas, Pau; Garcia, Adrià Rovira; Subirana, Jaume Sanz (October 2020, ION GNSS+, The International Technical Meeting of the Satellite Division of The Institute of Navigation)

   null (Ed.)
4. Optogenetic Regulation of EphA1 RTK Activation and Signaling

   Anna I Wurz, Kevin Zheng (February 2024, bioRxiv)

   Eph receptors are ubiquitous class of transmembrane receptors that mediate cell-cell communication, proliferation, differentiation, and migration. EphA1 receptors specifically play an important role in angiogenesis, fetal development, and cancer progression; however, studies of this receptor can be challenging as its ligand, ephrinA1, binds and activates several EphA receptors simultaneously. Optogenetic strategies could be applied to circumvent this requirement for ligand activation and enable selective activation of the EphA1 subtype. In this work, we designed and tested several iterations of an optogenetic EphA1 - Cryptochrome 2 (Cry2) fusion, investigating their capacity to mimic EphA1-dependent signaling in response to light activation. We then characterized the key cell signaling target of MAPK phosphorylation activated in response to light stimulation. The optogenetic regulation of Eph receptor RTK signaling without the need for external stimulus promises to be an effective means of controlling individual Eph receptor-mediated activities and creates a path forward for the identification of new Eph-dependent functions 

   more » « less
5. Offline GNSS/Camera Extrinsic Calibration Using RTK and Fiducials

   https://doi.org/10.1109/LRA.2023.3268014  

   Jordan, Alex D.; Johnson, Jacob C.; McLain, Timothy W.; Beard, Randal W. (June 2023, IEEE Robotics and Automation Letters)