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Zhiyong Xu

4 accepted papers

2026

Mixture-Of-Experts Policy for Smooth and Stable Multi-Posture Fall Recovery in Bipedal Robot

ICRA 2026poster

Bipedal robots are inherently prone to falling due to their higher center of mass and narrower support polygon, making automatic fall recovery a long-standing challenge. Existing approaches often rely on posture-specific strategies or exhibit limited robustness and generalization, restricting their …

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2026

PromptEnhancer: Taming Your Rewriter for Text-to-Image Generation via Fine-Grained Reward

CVPR 2026

Recent text-to-image (T2I) diffusion models have achieved impressive progress in generating high-fidelity images, yet they often fail to faithfully follow complex user prompts, especially in attribute binding, negation, and compositional reasoning. To address this limitation, we propose PromptEnhanc

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2026

Ripple Shapley: Data Influence Attribution in One Federated Training Run

AAAI 2026technical

Contribution evaluation is essential for incentivizing high-quality data sharing in federated learning (FL), yet existing Shapley-value-based methods are prohibitively expensive and overlook temporal influence propagation. In this paper, we propose Ripple Shapley, a novel attribution framework that

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2025

Enhancing the Flexibility of a Quadruped Robot with a 2-DOF Active Spine Using Nonlinear Model Predictive Control

IROS 2025

For quadrupeds, a flexible spine allows them to traverse space and make quick turns. From the perspective of mechanical design in quadruped robots, an active spine with 2 degrees of freedom (2-DOF) can achieve dynamic posture adjustment similar to biological organisms which allows for pitch and yaw

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