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Research: publications and talks

transfertransfer

Articles

Real-Time Public Transit Routing with Unlimited Transfers

Your phone answers "fastest way across town" in milliseconds — but car routing and transit routing are secretly very different problems. A tour from plain Dijkstra to the ULTRA family, and why timetables make everything harder.

public transitroutingalgorithmsliterature review

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How we sped up Public Transit Routing around the globe

OpenTripPlanner powers transit routing for agencies and governments worldwide. We made it up to 2 times faster with just a few lines of code.

public transitroutingOpenTripPlannerperformance

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Selected publications

  • Decomposing Food Images for Better Nutrition Analysis: A Nutritionist-Inspired Two-Step Multimodal LLM Approach

    P. Khlaisamniang, K. Kerdthaisong, S. Vorathammathorn, N. Yongsatianchot, H. Phimsiri, T. Thitseesaeng, K. Veerakanjana, K. Kachai, P. Ittichaiwong, T. Saengja

    Conference on Computer Vision and Pattern Recognition (CVPR) Workshops, 2025

    A nutritionist-inspired, two-step multimodal-LLM pipeline for food image nutrition analysis.

  • Adapting Dijkstra for Buffers and Unlimited Transfers

    D. Katkalo, A. Rohovyi, T. Walsh

    The IEEE International Conference on Intelligent Transportation Systems (ITSC), 2026

    Classical time-dependent Dijkstra, adapted to handle stop buffers and transfers of unlimited distance.

  • SICAR at RRG2024: A GPU Poor’s Guide to Radiology Report Generation

    P. Khlaisamniang et al.

    The 23rd Workshop on Biomedical Natural Language Processing (BioNLP), ACL 2024

    A GPU-poor recipe for radiology report generation with multimodal LLMs.

  • Fast and Memory Efficient Multimodal Journey Planning with Delays

    D. Katkalo, A. Rohovyi, T. Walsh

    The Symposium on Combinatorial Search (SoCS), 2026

    Multimodal journey planning that stays fast and compact even under real-time delays.

  • ST-CopulaGNN: A Multi-View Spatio-Temporal Graph Neural Network for Traffic Forecasting

    P. Khlaisamniang, S. Phoomvuthisarn

    The 35th International Conference on Scientific and Statistical Database Management (SSDBM), Article 8, 2023

    A multi-view spatio-temporal graph neural network for traffic forecasting.

  • Early Pruning for Public Transport Routing

    A. Rohovyi, A. Abuaisha, T. Walsh

    The 16th World Conference on Transport Research (WCTR), 2026

    Sort transfers by length and stop scanning early: up to 68% faster transit search, now in OpenTripPlanner.

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  • Multimodal Pathfinding with Personalized Travel Speed and Transfers of Unlimited Distance

    A. Rohovyi, P.J. Stuckey, T. Walsh

    2025 IEEE 37th International Conference on Tools with Artificial Intelligence (ICTAI), 2025

    Personalised travel speeds and unlimited-distance transfers, via computational geometry on TD-Dijkstra.

  • A Modified DSSFN Architecture with E-FDPC Band Selection and Intermediate Cross-Attention for UAV-Based Hyperspectral Image Classification

    D. Katkalo

    2025 IEEE 8th International Conference on Methods and Systems of Navigation and Motion Control (MSNMC), 2025

    Band selection and cross-attention for UAV-based hyperspectral image classification.

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