Tootfinder

JamShield: A Machine Learning Detection System for Over-the-Air Jamming Attacks
Ioannis Panitsas, Yagmur Yigit, Leandros Tassiulas, Leandros Maglaras, Berk Canberk
https://arxiv.org/abs/2507.11483

JamShield: A Machine Learning Detection System for Over-the-Air Jamming Attacks
Wireless networks are vulnerable to jamming attacks due to the shared communication medium, which can severely degrade performance and disrupt services. Despite extensive research, current jamming detection methods often rely on simulated data or proprietary over-the-air datasets with limited cross-layer features, failing to accurately represent the real state of a network and thus limiting their effectiveness in real-world scenarios. To address these challenges, we introduce JamShield, a dynam…

The Everyday Security of Living with Conflict
Jessica McClearn, Reem Talhouk, Rikke Bjerg Jensen
https://arxiv.org/abs/2506.09580 https://

The Everyday Security of Living with Conflict
When `cyber' is used as a prefix, attention is typically drawn to the technological and spectacular aspects of war and conflict -- and, by extension, security. We offer a different approach to engaging with and understanding security in such contexts, by foregrounding the everyday -- mundane -- experiences of security within communities living with and fleeing from war. We do so through three vignettes from our field research in Colombia, Lebanon and Sweden, respectively, and by highlighting th…

Heute wird's 34 °C bei uns, und dieser Zettel lag im Briefkasten...
"Ich habe heute leider kein Wasser 💧 für dich"
#Wasser

A Study of Non-linear Flows and Shear Banding in Wormlike Micelles Under Varying Elasticity, Flow Curvature, and Surfactant Chemistry
Alfredo Scigliani, Hadi Mohammadigoushki
https://arxiv.org/abs/2507.07218

A Study of Non-linear Flows and Shear Banding in Wormlike Micelles Under Varying Elasticity, Flow Curvature, and Surfactant Chemistry
We report the flow dynamics of two shear-banding wormlike micellar solutions with distinct surfactant chemistries in a Taylor-Couette (TC) setup following a startup shear. The solutions, formulated with CTAB/NaSal and CPyCl/NaSal, exhibit comparable bulk rheology and equilibrium microstructural properties. By varying the TC gap size, we systematically examine elasticity number over a range of 128000-4470000, while flow curvature spans from 0.022 to 0.171. Under a step shear into the stress plat…

Real Noncommutative Convexity II: Extremality and nc convex functions
David P. Blecher, Caleb Becker McClure
https://arxiv.org/abs/2507.22833 https://arxiv…

Real Noncommutative Convexity II: Extremality and nc convex functions
We continue with the theory of real noncommutative (nc) convexity, following the recent and profound complex case developed by Davidson and Kennedy. The present paper focuses on the theory of nc extreme (and pure and maximal) points and the nc Choquet boundary in the real case, and on the theory of real nc convex and semicontinuous functions and real nc convex envelopes. Our main emphasis is on how these interact with complexification. For example some of our paper analyzes carefully how variou…

An Ejection Event Captured by VLBI During the Outburst of Swift J1727.8$-$1613
Hongmin Cao, Jun Yang, S\'andor Frey, Callan M. Wood, James C. A. Miller-Jones, Krisztina \'E. Gab\'anyi, Giulia Migliori, Marcello Giroletti, Lang Cui, Tao An, Xiaoyu Hong, Weihua Wang
https://arxiv.org/abs/2506.18817

An Ejection Event Captured by VLBI During the Outburst of Swift J1727.8$-$1613
We observed a newly-discovered Galactic black hole X-ray binary Swift J1727.8$-$1613 with the European Very Long Baseline Interferometry Network (EVN) at 5 GHz. The observation was conducted immediately following a radio quenching event detected by the Karl G. Jansky Very Large Array (VLA). The visibility amplitude evolution over time reveals a large-amplitude radio flare and is consistent with an ejection event. The data can be interpreted either as a stationary component (i.e., the radio core…

Real Non-Commutative Convexity I
David P. Blecher, Caleb McClure
https://arxiv.org/abs/2506.13512 https://arxiv.org/pdf/2506.13512

Real Non-Commutative Convexity I
We initiate the theory of real noncommutative convex sets, following the recent and profound complex case developed by Davidson and Kennedy. The present paper focuses on the real case of the topics from the first several sections of their profound memoir.. Later results will be discussed in a future paper. We give many foundational structural results for real operator systems and their associated noncommutative (nc) convex sets, and elucidate how the complexification interacts with the basic co…