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Han-Wen Liu

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#artificial intelligence Preprint Sep 2026

DAGent: Evaluate-then-Grow Planning for Deep Research Agents

Deep research tasks require agents to navigate large knowledge spaces, synthesize evidence across many sources, and adapt their plans as findings emerge. Directed acyclic graph (DAG)-based multi-agent systems suit this setting because they support parallel execution and isolate each sub-task within a focused dependency...

Han-Wen Liu, Yuan-Fu Sun, Qiao-Yu Tan · 0 citations

SEFRQO-Plus: A Self-Evolving Query Optimizer via Large Language Models and Retrieval-Augmented Generation

This paper designs a feedback-oriented vector database with query structure-aware embed-dings to support effective similarity search, and incorporates multi-layered histories as references to enrich the feedback, and enhances the prompt optimization work-flow by utilizing multi-dimensional historical feedback to drive...

Han-Wen Liu, Qihan Zhang, Ryan Marcus et al. · 0 citations

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