Physico-chimie de l'ion aluminium en solution et étude de son adsorption par la silice

dissertn: Diss. Doct

Vulnerability of Clean-Label Poisoning Attack for Object Detection in Maritime Autonomous Surface Ships

Artificial intelligence (AI) will play an important role in realizing maritime autonomous surface ships (MASSs). However, as a double-edged sword, this new technology brings forth new threats. The purpose of this study is to raise awareness among stakeholders regarding the potential security threats posed by AI in MASSs. To achieve this, we propose a hypothetical attack scenario in which a clean-label poisoning attack was executed on an object detection model, which resulted in boats being misclassified as ferries, thus preventing the detection of pirates approaching a boat. We used the poison frog algorithm to generate poisoning instances, and trained a YOLOv5 model with both clean and poisoned data. Despite the high accuracy of the model, it misclassified boats as ferries owing to the poisoning of the target instance. Although the experiment was conducted under limited conditions, we confirmed vulnerabilities in the object detection algorithm. This misclassification could lead to inaccurate AI decision making and accidents. The hypothetical scenario proposed in this study emphasizes the vulnerability of object detection models to clean-label poisoning attacks, and the need for mitigation strategies against security threats posed by AI in the maritime industry

Immobilisation de la levure par adh sion @ un support polym rique

SIGLEBSE B224612M / UCL - Université Catholique de LouvainBEBelgiu

Atomic Layer Deposition of Inorganic Thin Films on 3D Polymer Nanonetworks

Atomic layer deposition (ALD) is a unique tool for conformally depositing inorganic thin films with precisely controlled thickness at nanoscale. Recently, ALD has been used in the manufacture of inorganic thin films using a three-dimensional (3D) nanonetwork structure made of polymer as a template, which is pre-formed by advanced 3D nanofabrication techniques such as electrospinning, block-copolymer (BCP) lithography, direct laser writing (DLW), multibeam interference lithography (MBIL), and phase-mask interference lithography (PMIL). The key technical requirement of this polymer template-assisted ALD is to perform the deposition process at a lower temperature, preserving the nanostructure of the polymer template during the deposition process. This review focuses on the successful cases of conformal deposition of inorganic thin films on 3D polymer nanonetworks using thermal ALD or plasma-enhanced ALD at temperatures below 200 °C. Recent applications and prospects of nanostructured polymer–inorganic composites or hollow inorganic materials are also discussed

Surface properties of polycarbonate and promotion of yeast cells adhesion

Bonding of sulfate groups is the main surface modification occurring when polycarbonate plates are oxidized by K/sub 2/Cr/sub 2/O/sub 7/-H/sub 2/SO/sub 4/. Contact of un- or oxidized polycarbonate with a supersaturated ferric solution gives rise to deposition of ferric hydroxide which produces a charge reversal and allows adhesion of a dense layer of yeast cells. Successive application of the two treatments avoids a loss of the cell adhesion promoting efficiency when the support is dried after the the Fe treatment; this is attributed to better anchoring of ferric hydroxide on the strongly negative surface obtained after oxidation.Anglai