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Author

Bum Jun Kim

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#artificial intelligence Preprint Oct 2026

Detect and Suppress: A Mechanistic Defense against Adversarial Patches in VLA Models

Adversarial patches can disrupt Vision-Language-Action (VLA) models by manipulating visual observations, leading to failures in robot control. However, it remains poorly understood which internal mechanisms underlie these failures and how targeted interventions can mitigate them. In this work, we mechanistically analyz...

Yukiya Horiba, Koshiro Aoki, Shunsuke Yasuki et al. · 0 citations
Preprint Aug 2026

MiNO: Cotangent-bundle propagator learning for PDEs

The microlocal neural operator (MiNO) learns that object, a phase and amplitude in phase space, and recovers the solution by an oscillatory integral, whereas a physics-informed neural network with neural-tangent-kernel loss balancing stays near its initial error.

Gnankan Landry Regis N'guessan, Bum Jun Kim · 0 citations
#machine learning Preprint Jul 2026

Z-Loss Backward Geometry in Dense Output Heads and Sparse Routers

A backward-transport view for Z-loss is developed that separates the source's scalar amplitude and softmax shape from the transport factors, and shows that nearly identical forward Z-loss values can coexist with distinct logit-space Z-loss gradients and, after architectural and optimizer transport, distinct parameter u...

Bum Jun Kim · 0 citations

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