1,017 research outputs found
Nonlinear Model Predictive Control for Multi-Micro Aerial Vehicle Robust Collision Avoidance
Multiple multirotor Micro Aerial Vehicles sharing the same airspace require a
reliable and robust collision avoidance technique. In this paper we address the
problem of multi-MAV reactive collision avoidance. A model-based controller is
employed to achieve simultaneously reference trajectory tracking and collision
avoidance. Moreover, we also account for the uncertainty of the state estimator
and the other agents position and velocity uncertainties to achieve a higher
degree of robustness. The proposed approach is decentralized, does not require
collision-free reference trajectory and accounts for the full MAV dynamics. We
validated our approach in simulation and experimentally.Comment: Video available on: https://www.youtube.com/watch?v=Ot76i9p2ZZo&t=40
TrajFlow: Learning the Distribution over Trajectories
Predicting the future behaviour of people remains an open challenge for the
development of risk-aware autonomous vehicles. An important aspect of this
challenge is effectively capturing the uncertainty which is inherent to human
behaviour. This paper studies an approach for probabilistic motion forecasting
with improved accuracy in the predicted sample likelihoods. We are able to
learn multi-modal distributions over the motions of an agent solely from data,
while also being able to provide predictions in real-time. Our approach
achieves state-of-the-art results on the inD dataset when evaluated with the
standard metrics employed for motion forecasting. Furthermore, our approach
also achieves state-of-the-art results when evaluated with respect to the
likelihoods it assigns to its generated trajectories. Evaluations on artificial
datasets indicate that the distributions learned by our model closely
correspond to the true distributions observed in data and are not as prone
towards being over-confident in a single outcome in the face of uncertainty
Reachability-Based Confidence-Aware Probabilistic Collision Detection in Highway Driving
Risk assessment is a crucial component of collision warning and avoidance
systems in intelligent vehicles. To accurately detect potential vehicle
collisions, reachability-based formal approaches have been developed to ensure
driving safety, but suffer from over-conservatism, potentially leading to
false-positive risk events in complicated real-world applications. In this
work, we combine two reachability analysis techniques, i.e., backward reachable
set (BRS) and stochastic forward reachable set (FRS), and propose an integrated
probabilistic collision detection framework in highway driving. Within the
framework, we can firstly use a BRS to formally check whether a two-vehicle
interaction is safe; otherwise, a prediction-based stochastic FRS is employed
to estimate a collision probability at each future time step. In doing so, the
framework can not only identify non-risky events with guaranteed safety, but
also provide accurate collision risk estimation in safety-critical events. To
construct the stochastic FRS, we develop a neural network-based acceleration
model for surrounding vehicles, and further incorporate confidence-aware
dynamic belief to improve the prediction accuracy. Extensive experiments are
conducted to validate the performance of the acceleration prediction model
based on naturalistic highway driving data, and the efficiency and
effectiveness of the framework with the infused confidence belief are tested
both in naturalistic and simulated highway scenarios. The proposed risk
assessment framework is promising in real-world applications.Comment: Under review at Engineering. arXiv admin note: text overlap with
arXiv:2205.0135
A Role for Pre-mRNA-PROCESSING PROTEIN 40C in the Control of Growth, Development, and Stress Tolerance in Arabidopsis thaliana
Because of their sessile nature, plants have adopted varied strategies for growing and reproducing in an ever-changing environment. Control of mRNA levels and pre-mRNA alternative splicing are key regulatory layers that contribute to adjust and synchronize plant growth and development with environmental changes. Transcription and alternative splicing are thought to be tightly linked and coordinated, at least in part, through a network of transcriptional and splicing regulatory factors that interact with the carboxyl-terminal domain (CTD) of the largest subunit of RNA polymerase II. One of the proteins that has been shown to play such a role in yeast and mammals is pre-mRNA-PROCESSING PROTEIN 40 (PRP40, also known as CA150, or TCERG1). In plants, members of the PRP40 family have been identified and shown to interact with the CTD of RNA Pol II, but their biological functions remain unknown. Here, we studied the role of AtPRP40C, in Arabidopsis thaliana growth, development and stress tolerance, as well as its impact on the global regulation of gene expression programs. We found that the prp40c knockout mutants display a late-flowering phenotype under long day conditions, associated with minor alterations in red light signaling. An RNA-seq based transcriptome analysis revealed differentially expressed genes related to biotic stress responses and also differentially expressed as well as differentially spliced genes associated with abiotic stress responses. Indeed, the characterization of stress responses in prp40c mutants revealed an increased sensitivity to salt stress and an enhanced tolerance to Pseudomonas syringae pv. maculicola (Psm) infections. This constitutes the most thorough analysis of the transcriptome of a prp40 mutant in any organism, as well as the first characterization of the molecular and physiological roles of a member of the PRP40 protein family in plants. Our results suggest that PRP40C is an important factor linking the regulation of gene expression programs to the modulation of plant growth, development, and stress responses.Fil: Hernando, Carlos Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; ArgentinaFil: García Hourquet, Mariano. Fundación Instituto Leloir; ArgentinaFil: de Leone, María José. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; ArgentinaFil: Careno, Daniel Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; ArgentinaFil: Iserte, Javier Alonso. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; ArgentinaFil: Mora Garcia, Santiago. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; ArgentinaFil: Yanovsky, Marcelo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; Argentin
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