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Seungyoon Choi

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#artificial intelligence Preprint Sep 2026

DefaultGNN: A Dual-Perspective GNN Framework for Predicting Corporate Default from Buyer-Seller Transaction Networks

This work conducts a large-scale empirical study using real-world electronic tax-invoice data spanning six years that links transaction histories with default events, revealing that transaction-driven risk is both role-dependent (buyer or seller) and scale-dependent.

Junghoon Kim, Hyunsung Kim, Seungyoon Choi et al. · 0 citations
#machine learning Preprint Sep 2026

Compositional Spectral Prompts for LLM-based Online Time Series Forecasting

To address the sequential and evolving nature of time series, the Online Time Series Forecasting (OTSF) task has been extensively studied in multiple domains. Existing research focuses on adapting to non-stationary environments by employing memory buffer-based retrieval strategies. However, we observe that such framewo...

Seungyoon Choi, Hyunchul C. Kim, Jae-Gil Lee et al. · 1 citation

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