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Author

Chunran Zhang

Southwest Jiaotong University

5 papers indexed here

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Preprint Sep 2026

Top-K Is Not a Budget for Hybrid Retrieval

Modern hybrid retrieval for RAG typically fuses the Top-$L$ results from dense and sparse retrievers, but a fixed truncation depth may not transfer across changing queries and corpora. Exact fusion removes the dependence on a fixed depth, yet completing a specified Top-$K$ still incurs variable access costs. We present...

Chunran Zhang · 0 citations
#human-computer interacti... Preprint Sep 2026

Opacity Is Not Just Opacity

Background-adaptive contrast enhancement thus becomes part of the object's compositing properties, reducing the design and maintenance of separate color variants, and is implemented in the same WebGL pipeline, with no sustained additional runtime observed.

Chunran Zhang, Tian-Rui Li · 0 citations
Preprint Aug 2026

Query Expansion Should Be Coordinated: Dense Expands, Sparse Anchors

This work presents DESA (Dense Expansion and Sparse Anchoring), which shares generated references across channels but specializes their integration, which improves nDCG@10 and Recall@20 over the unexpanded query and reduces dense and sparse replay stopping depths.

Chunran Zhang · 0 citations
#natural language process... Preprint Aug 2026

Dense Expands, Sparse Anchors: Channel-Asymmetric Query Expansion for Hybrid Retrieval

LLM-based query expansion improves retrieval by generating document-like passages. In hybrid retrieval, however, most evaluations fuse fixed top-$L$ dense and sparse rankings. Because the cutoff controls both which cross-channel contributions enter fusion and how much of each ranking is accessed, gains measured at one...

Chunran Zhang · 0 citations
Preprint Aug 2026

Exact Adaptive Hybrid Retrieval Without Fixed Top-L Cutoffs

This work proposes Exact Adaptive Hybrid Retrieval (EAHR), which fixes the ordered Top-$K$ defined by complete-list weighted RRF as the retrieval target and treats channel depth as request-specific execution state and reproduced the complete-list ordered Top-20 in all 150 query-snapshot combinations.

Chunran Zhang · 2 citations

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