49 research outputs found
Memristive Learning Cellular Automata: Theory and Applications
Memristors are novel non volatile devices that manage to combine storing and
processing capabilities in the same physical place.Their nanoscale dimensions
and low power consumption enable the further design of various nanoelectronic
processing circuits and corresponding computing architectures, like
neuromorhpic, in memory, unconventional, etc.One of the possible ways to
exploit the memristor's advantages is by combining them with Cellular Automata
(CA).CA constitute a well known non von Neumann computing architecture that is
based on the local interconnection of simple identical cells forming
N-dimensional grids.These local interconnections allow the emergence of global
and complex phenomena.In this paper, we propose a hybridization of the CA
original definition coupled with memristor based implementation, and, more
specifically, we focus on Memristive Learning Cellular Automata (MLCA), which
have the ability of learning using also simple identical interconnected cells
and taking advantage of the memristor devices inherent variability.The proposed
MLCA circuit level implementation is applied on optimal detection of edges in
image processing through a series of SPICE simulations, proving its robustness
and efficacy
Exsolution-enhanced reverse water-gas shift chemical looping activity of Sr2FeMo0.6Ni0.4O6-δ double perovskite
This study investigates the structural evolution and redox characteristics of the double perovskite Sr2FeMo0.6Ni0.4O6-delta (SFMN) during hydrogen (H2) and carbon dioxide (CO2) redox cycles and explores the material performance in the Reverse Water-Gas Shift Chemical Looping (RWGS-CL) reaction. In-situ and ex-situ X-Ray Diffraction (XRD) and High-Resolution Transmission Electron Microscopy (HRTEM) studies reveal that H2 reduction at temperatures above 800 degrees C leads to the exsolution of bimetallic Ni-Fe alloy particles and the formation of a Ruddlesden-Popper (RP) phase. A core-shell structure with Ni-Fe core and a perovskite oxide shell is formed with subsequent redox cycles, and the resulting material exhibits better performance and high stability in the RWGS-CL process. Thermogravimetric (TGA) and Temperature Programmed Reduction (TPR) and Oxidation (TPO) analyses show that the optimal reduction and oxidation temperatures for maximizing the CO yield are around 850 degrees C and 750 degrees C respectively, and that the cycled material is able to work steadily under isothermal conditions at 850 degrees C
What Are Spectral and Spatial Distributions of EEG-EMG Correlations in Overground Walking? An Exploratory Study
You probably believe that a latent relationship between the brain and lower limbs exists and it varies across different walking conditions (e.g., walking with or without an exoskeleton). Have you ever thought what the distributions of measured signals are? To address this question, we simultaneously collected electroencephalogram (EEG) and electromyogram (EMG) signals while healthy participants were conducting four overground walking conditions without any constraints (e.g., specific speed). The EEG results demonstrated that a wide range of frequencies from delta band to gamma band were involved in walking. The EEG power spectral density (PSD) was significantly different in sensorimotor and posterior parietal areas between exoskeleton-assisted walking and non-exoskeleton walking. The EMG PSD difference was predominantly observed in the theta band and the gastrocnemius lateralis muscle. EEG-EMG PSD correlations differed among walking conditions. The alpha and beta bands were primarily involved in consistently increasing EEG-EMG PSD correlations across the walking conditions, while the theta band was primarily involved in consistently decreasing correlations as observed in the EEG involvement. However, there is no dominant frequency band as observed in the EMG involvement. Channels located over the sensorimotor area were primarily involved in consistently decreasing EEG-EMG PSD correlations and the outer-ring channels were involved in the increasing EEG-EMG PSD correlations. Our study revealed the spectral and spatial distributions relevant to overground walking and deepened the understanding of EEG and EMG representations during locomotion, which may inform the development of a more human-compatible exoskeleton and its usage in motor rehabilitation
Achaiki Iatriki : official publication of the medical society of western Greece and Peloponnesus
In the current issue, the editorial by Cauchi et al.
argues for eco-friendly measures in endoscopy and
emphasies the role of healthcare providers in reducing waste. The editorial adeptly employs the three Rs
(Reduce, Reuse, Recycle) framework to tackle waste
management, offering practical solutions. The editorial by Milionis et al. focuses on the reverse cascade
screening for paediatric familial hypercholesterolaemia
(FH), which is an upcoming tool for public health. Advantages, practices, and challenges regarding FH are
thoroughly discussed. Lastly, the editorial by Fousekis
et al. presents the main aspects of a chronic immune-mediated cutaneous disease, dermatitis herpetiformis
(DH), which constitutes an extraintestinal manifestation
of celiac disease, including its diagnosis, pathogenesis,
and management.
Moreover, this issue includes three review articles.
The review article by Krontira et al. discusses the evolving data on the epidemiology, diagnostic approach and
appropriate management of foreign body and caustic
substance ingestion, based on updated guidelines
published by gastroenterological and endoscopic societies. The review by Halliasos et al. provides data on the
clinical presentation, diagnosis, and management of
metastatic acute spinal cord compression, focusing on
the importance of a multidisciplinary team approach,
including spine surgeons, radiation oncologists, medical
oncologists, palliative care clinicians, physiotherapists,
and psychologists. Lastly, the review by Schinas et al.
outlines the potential of immune modulation in the
treatment of infections and the need for individualised approaches in the modern world of personalised
medicine by examining some of the key strategies and
immune-based therapies being developed to combat
infectious diseases.peer-reviewe
Le visage du Soleil dans la pensée grecque ancienne
This doctorate is composed of three parts (in 398 pages) : I - The Sun as a natural phenomen : The observation of the sky had provoked to the Ancient Greeks, from the beginning, religious and philosophical feelings, under the principe of the recognition between the macrocosme and microcosme. Gradually the astronomy coming out of the astrology developed through the archaic poetry, later the philosophy, and at the end through the scientific study of the celestial bodies mouvements. II - The Sun in the human life : According to the principles of the first part, we studied the religious aspects (the Sun as a god, as a distinct figure - the Sun's face, the Sun's cults) and the manifestations in the every day life (calendars, meteorological effects, apotelesmatic astronomy, astrology). III - The Sun into the human representations (literature - arts) : It's a panoramic view of the various aspects of the Sun into the ancient Greek civilisation and culture which came out of a deel clear Greek origin.La thèse se compose trois parties (occupant 398 p.) : I - Le soleil comme phénomène naturel : L'observation du ciel a d'abord provoqué chez les Grecs anciens l'éveil de sentiments religieux et philosophiques, avec le principe de reconnaissance entre macrocosme et microcosme. Se dégageant progressivement de l'astrologie, l'astronomie s'est développée à travers la philosophie et enfin par l'étude scientifique du mouvement de corps célestes. II - Le soleil dans la vie des hommes : En harmonie avec les principes de la première partie, on étudie les aspects religieux (le Soleil comme divinité, en tant que figure propre - le visage du Soleil, les cultures solaires), les manifestations du Soleil dans la vie quotidienne (calendrier, les effets météorologiques, l'astronomie apotélesmatique, l'astrologie). III - Le soleil dans les représentations des hommes (littérature - arts) : C'est un panorama des différents aspects du Soleil dans la civilisation et la culture grecques antiques qui est ainsi présenté, avec ses fondements proprement helléniques
XGRN: Reconstruction of Biological Networks Based on Boosted Trees Regression
In Systems Biology, the complex relationships between different entities in the cells are modeled and analyzed using networks. Towards this aim, a rich variety of gene regulatory network (GRN) inference algorithms has been developed in recent years. However, most algorithms rely solely on gene expression data to reconstruct the network. Due to possible expression profile similarity, predictions can contain connections between biologically unrelated genes. Therefore, previously known biological information should also be considered by computational methods to obtain more consistent results, such as experimentally validated interactions between transcription factors and target genes. In this work, we propose XGBoost for gene regulatory networks (XGRN), a supervised algorithm, which combines gene expression data with previously known interactions for GRN inference. The key idea of our method is to train a regression model for each known interaction of the network and then utilize this model to predict new interactions. The regression is performed by XGBoost, a state-of-the-art algorithm using an ensemble of decision trees. In detail, XGRN learns a regression model based on gene expression of the two interactors and then provides predictions using as input the gene expression of other candidate interactors. Application on benchmark datasets and a real large single-cell RNA-Seq experiment resulted in high performance compared to other unsupervised and supervised methods, demonstrating the ability of XGRN to provide reliable predictions