90 research outputs found
A duality between pairs of split decompositions for a Q-polynomial distance-regular graph
AbstractLet Γ denote a Q-polynomial distance-regular graph with diameter D≥3 and standard module V. Recently, Ito and Terwilliger introduced four direct sum decompositions of V; we call these the (μ,ν)-split decompositions of V, where μ,ν∈{↓,↑}. In this paper we show that the (↓,↓)-split decomposition and the (↑,↑)-split decomposition are dual with respect to the standard Hermitian form on V. We also show that the (↓,↑)-split decomposition and the (↑,↓)-split decomposition are dual with respect to the standard Hermitian form on V
Privacy-Preserving Deep Learning Computation for Geo-Distributed Medical Big-Data Platforms
This paper proposes a distributed deep learning framework for
privacy-preserving medical data training. In order to avoid patients' data
leakage in medical platforms, the hidden layers in the deep learning framework
are separated and where the first layer is kept in platform and others layers
are kept in a centralized server. Whereas keeping the original patients' data
in local platforms maintain their privacy, utilizing the server for subsequent
layers improves learning performance by using all data from each platform
during training.Comment: 2019 IEEE/IFIP International Conference on Dependable Systems and
Networks Supplementa
Self-Supervised Motion Retargeting with Safety Guarantee
In this paper, we present self-supervised shared latent embedding (S3LE), a
data-driven motion retargeting method that enables the generation of natural
motions in humanoid robots from motion capture data or RGB videos. While it
requires paired data consisting of human poses and their corresponding robot
configurations, it significantly alleviates the necessity of time-consuming
data-collection via novel paired data generating processes. Our self-supervised
learning procedure consists of two steps: automatically generating paired data
to bootstrap the motion retargeting, and learning a projection-invariant
mapping to handle the different expressivity of humans and humanoid robots.
Furthermore, our method guarantees that the generated robot pose is
collision-free and satisfies position limits by utilizing nonparametric
regression in the shared latent space. We demonstrate that our method can
generate expressive robotic motions from both the CMU motion capture database
and YouTube videos
Drosophila Graf regulates mushroom body β-axon extension and olfactory long-term memory
Abstract
Loss-of-function mutations in the human oligophrenin-1 (OPHN1) gene cause intellectual disability, a prevailing neurodevelopmental condition. However, the role OPHN1 plays during neuronal development is not well understood. We investigated the role of the Drosophila OPHN1 ortholog Graf in the development of the mushroom body (MB), a key brain structure for learning and memory in insects. We show that loss of Graf causes abnormal crossing of the MB β lobe over the brain midline during metamorphosis. This defect in Graf mutants is rescued by MB-specific expression of Graf and OPHN1. Furthermore, MB α/β neuron-specific RNA interference experiments and mosaic analyses indicate that Graf acts via a cell-autonomous mechanism. Consistent with the negative regulation of epidermal growth factor receptor (EGFR)-mitogen-activated protein kinase (MAPK) signaling by Graf, activation of this pathway is required for the β-lobe midline-crossing phenotype of Graf mutants. Finally, Graf mutants have impaired olfactory long-term memory. Our findings reveal a role for Graf in MB axon development and suggest potential neurodevelopmental functions of human OPHN1.This work was supported by grants from the National Research Foundation of Korea (2017M3C7A1025368 and 2019R1A2C2089437)
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