Hahn Koo Associate Professor   [CV] Department of Linguistics and Language Development San Jose State University One Washington Square San Jose, CA, 95192-0093, U.S.A. Phone: +1-408-924-7093 Email: hahn.koo@sjsu.edu

Office hours in Spring 2026

• MW 1500-1530, TR 1330-1400 (sign up using this calendar)

Teaching in Spring 2026

• LING 111: Introduction to Linguistic Phonetics

• LING 123: Sound and Communication

• LING 124: Introduction to Speech Technology

• LING 230: Seminar in Linguistics

Recent work

• Extending unsupervised phonetic segmentation with self-supervised speech embeddings
  Poster presented at the 190th Meeting of the Acoustical Society of America
  

• A Praat script for unsupervised phoneme segmentation based on spectro-temporal representation
  Poster presented at the 189th Meeting of the Acoustical Society of America
  (code available here, proceedings paper here)
  

• Overfitting in deep learning models for disfluency detection in bilingual children
  (joint work with Caryn Iwakiri, Pei-Tzu Tsai, and Janet Bang)
  Poster presented at the 2025 American Speech and Hearing Association (ASHA) Convention
  (designated as an ASHA Convention Centennial Session)
  

• Understanding AI model development and application in disfluency detection
  (joint work with Caryn Iwakiri, Pei-Tzu Tsai, and Janet Bang)
  Poster presented at the 2025 American Speech and Hearing Association (ASHA) Convention
  

• Unsupervised phoneme segmentation using a transformer autoencoder
  Poster presented at BayPhon2025@UCSC
  (code available here)
  

Selected publications

• Tier-adjacency is not a necessary condition for learning phonotactic dependencies
  (joint work with Lydia Callahan)
  Language and Cognitive Processes, volume 27, issue 10, 2012, pages 1425-1432.

• An unsupervised method for identifying loanwords in Korean
  Language Resources and Evaluation, volume 49, issue 2, 2015, pages 355-373.

• Discourse-pragmatic functions of the present perfect in American English TV and radio interviews
  (joint work with Stefan Frazier)
  Text & Talk, volume 39, issue 1, 2019, pages 77-98.

• Effects of lexical frequency on the post-exposure magnitude of recalibration in lexically guided perceptual learning: An explorative analysis
  (joint work with Reiko Kataoka, Julia Thomas Swan, and Christina Y. Tzeng)
  JASA Express Letters, volume 3, issue 8, 2023, pages 085201_1-7.