Tootfinder

Heute vor 27 Jahren: Am 11. Juni 1998 löste eine Fehlauslösung des Sprühsystems im #Kernkraftwerk #Belleville eine automatische #Reaktorabschaltung aus. Dabei klemmte ein Steuereleme…

Deploying SICNav in the Field: Safe and Interactive Crowd Navigation using MPC and Bilevel Optimization
Sepehr Samavi, Garvish Bhutani, Florian Shkurti, Angela P. Schoellig
https://arxiv.org/abs/2506.08851

Deploying SICNav in the Field: Safe and Interactive Crowd Navigation using MPC and Bilevel Optimization
Safe and efficient navigation in crowded environments remains a critical challenge for robots that provide a variety of service tasks such as food delivery or autonomous wheelchair mobility. Classical robot crowd navigation methods decouple human motion prediction from robot motion planning, which neglects the closed-loop interactions between humans and robots. This lack of a model for human reactions to the robot plan (e.g. moving out of the way) can cause the robot to get stuck. Our proposed …

» Angesprochen sind in erster Linie Privatpersonen, die ihren privaten Parkplatz dem Personal von Pflegediensten zur Verfügung stellen, wenn sie ihn selbst nicht brauchen (zum Beispiel wenn sie gerade bei der Arbeit sind). 
Bringen Sie dafür einfach das Plakat gut sichtbar bei Ihrer privaten Parkfläche an und zeigen Sie den Pflegediensten, dass sie hier willkommen sind. «

Ein Parkplatz für die Pflege | Bielefeld

Vulnerability-Based Optimal Grid Defense Strategies for Enhancing Cyber-Physical Energy System Resilience
Eric T\"onges, Philipp H\"artel, Martin Braun
https://arxiv.org/abs/2506.09766

Vulnerability-Based Optimal Grid Defense Strategies for Enhancing Cyber-Physical Energy System Resilience
An approach is proposed to identify optimal asset protection strategies based on vulnerability assessment outcomes. Traditional bilevel attacker-defender models emphasize worstcase scenarios but offer limited defensive guidance. In contrast, trilevel models introduce high computational complexity and rely on fixed network configurations. The proposed critical-components method leverages vulnerability assessment results to determine protection strategies, effectively outsourcing the upper-level …

CR-BLEA: Contrastive Ranking for Adaptive Resource Allocation in Bilevel Evolutionary Algorithms
Dejun Xu, Jijia Chen, Gary G. Yen, Min Jiang
https://arxiv.org/abs/2506.06362

CR-BLEA: Contrastive Ranking for Adaptive Resource Allocation in Bilevel Evolutionary Algorithms
Bilevel optimization poses a significant computational challenge due to its nested structure, where each upper-level candidate solution requires solving a corresponding lower-level problem. While evolutionary algorithms (EAs) are effective at navigating such complex landscapes, their high resource demands remain a key bottleneck -- particularly the redundant evaluation of numerous unpromising lower-level tasks. Despite recent advances in multitasking and transfer learning, resource waste persis…

The hot circumgalactic medium in stacked X-rays: observations vs simulations
Skylar Grayson, Evan Scannapieco, Johan Comparat, John A. ZuHone, Yi Zhang, Soumya Shreeram, Marcus Bruggen, Esra Bulbul
https://arxiv.org/abs/2506.09123

The hot circumgalactic medium in stacked X-rays: observations vs simulations
Current cosmological simulations rely on active galactic nuclei (AGN) feedback to quench star formation and match observed stellar mass distributions, but models for AGN feedback are poorly constrained. The circumgalactic medium (CGM) provides a helpful laboratory to study this process, as its metallicity, temperature, and density distributions are directly impacted by AGN. Recent observations from the eROSITA instrument provide constraints on these distributions through measurements of extende…

Nur damit die ICE-Verbindung von #Bielefeld nach #Hannover ein paar Minuten schneller wird, will die #Bahn die Johannesbachaue zubetonieren – ein wichtiges Naherholungsgebiet und Naturreservat in

This https://arxiv.org/abs/2401.17852 has been replaced.
link: https://scholar.google.com/scholar?q=a

Theoretical smoothing frameworks for nonsmooth simple bilevel problems
Bilevel programming has recently received a great deal of attention due to its abundant applications in many areas. The optimal value function approach provides a useful reformulation of the bilevel problem, but its utility is often limited due to the nonsmoothness of the value function even in cases when the associated lower-level function is smooth. In this paper, we present two smoothing strategies for the value function associated with lower-level functions that are not necessarily smooth b…

Die #LagederNation ist dieses Mal außerordentlich interessant.
#Dobrindt kriegt sein Fett weg, #Linartas im Interview, Polen, Energiewende - guckt selbst ins Inhaltsverzeichnis. 😉
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LdN434 Bundesregierung ignoriert Gericht, Rechtsaußen neuer Präsident Polens (Kornelia Kończal, Uni Bielefeld), Wie Kommunen Akzeptanz von Windrädern steigern, Ungleichheit gefährdet Demokratie (Martyna Linartas, Autorin), Korrektur: Bundeswehr und Google-Cloud

This https://arxiv.org/abs/2412.06436 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

An Adaptively Inexact Method for Bilevel Learning Using Primal-Dual Style Differentiation
We consider a bilevel learning framework for learning linear operators. In this framework, the learnable parameters are optimized via a loss function that also depends on the minimizer of a convex optimization problem (denoted lower-level problem). We utilize an iterative algorithm called `piggyback' to compute the gradient of the loss and minimizer of the lower-level problem. Given that the lower-level problem is solved numerically, the loss function and thus its gradient can only be computed …