Publications

This list includes preprints, manuscripts under review, and conference proceedings from my undergraduate research under Prof. Rajeev Rajan (GEC Idukki) and collaborators.

Manuscripts under review

• A. P. Shaji, "Positional Prüfer Sequences for Ordered Trees", In Foundations of Software Technology and Theoretical Computer Science (FSTTCS), 2026 (in rebuttal).

  A length-(n−1) bijective integer encoding for ordered rooted labeled trees with O(n) encoding/decoding, plus an O(1) query Navigation Index.

• A. P. Shaji, R. Rajan, "WaveCrossAttNet: Wavelet-Guided Hybrid CNN-Transformer for Ichthyosis Classification", Submitted to Springer Nature, 2026.

  Achieved 96.25% ± 0.81% accuracy across 5-fold cross-validation with 6.2x fewer parameters than BiomedCLIP.

• A. P. Shaji, R. Rajan, "H-CoAtNet: Hybrid CNN-Transformer for Image Classification", In BMC Bioinformatics, Springer Nature, 2026 (in rebuttal).

  Hybrid vision architecture attaining 90.51% classification accuracy across complex imaging modalities.

Peer-reviewed conference proceedings

• A. P. Shaji, R. Rajan, "HI-MobileNet: A Lightweight Deep Learning Framework for Automated Diagnosis of Harlequin Ichthyosis", In 7th International Conference on Recent Advances in Intelligent Computational Systems (RAICS), IEEE, 2026.

  Curated 6.9K-image dataset; achieved 99.96% accuracy with MobileNetV2 transfer learning on low-power devices.

• A. P. Shaji, R. Rajan, "Deep Temporal Representation Learning for Sample-Efficient Human Activity Recognition from Video Sequences", In International Conference on Power, Instrumentation, Control and Computing (PICC), IEEE, 2025.

  Systematic comparative benchmark of CNN, CNN-LSTM, VideoMAE, and V-JEPA2; CNN-LSTM achieved 96.23% accuracy.

Research experience

• Undergraduate Researcher, with Prof. Rajeev Rajan, GEC Idukki (Feb 2025 - present).

  Focusing on computer vision, medical image analysis, and representation learning; reproducible PyTorch/TensorFlow pipelines.

Workshops & Talks

• Hands-on Deep Learning and Agent Reliability Workshops, IEEE Student Branch, College of Engineering Munnar (2025 - 2026).