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Shohei Higashiyama

4 accepted papers

2025

A Text Embedding Model with Contrastive Example Mining for Point-of-Interest Geocoding

COLING 2025main

Geocoding is a fundamental technique that links location mentions to their geographic positions, which is important for understanding texts in terms of where the described events occurred. Unlike most geocoding studies that targeted coarse-grained locations, we focus on geocoding at a fine-grained p…

2025

Comprehensive Evaluation on Lexical Normalization: Boundary-Aware Approaches for Unsegmented Languages

EMNLP 2025

Lexical normalization research has sought to tackle the challenge of processing informal expressions in user-generated text, yet the absence of comprehensive evaluations leaves it unclear which methods excel across multiple perspectives. Focusing on unsegmented languages, we make three key contribut

2025

Graph-Structured Trajectory Extraction from Travelogues

ACL 2025long

Human traveling trajectories play a central role in characterizing each travelogue, and automatic trajectory extraction from travelogues is highly desired for tourism services, such as travel planning and recommendation. This work addresses the extraction of human traveling trajectories from travelo…

2021

User-Generated Text Corpus for Evaluating Japanese Morphological Analysis and Lexical Normalization

NAACL 2021long

Morphological analysis (MA) and lexical normalization (LN) are both important tasks for Japanese user-generated text (UGT). To evaluate and compare different MA/LN systems, we have constructed a publicly available Japanese UGT corpus. Our corpus comprises 929 sentences annotated with morphological a…