Seiichi Nakagawa
University of Yamanashi
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Publication
Featured researches published by Seiichi Nakagawa.
the second international conference | 2002
Hiromitsu Nishizaki; Seiichi Nakagawa
This paper describes a Japanese spoken document retrieval system that is robust for Out-of-Vocabulary (OOV) words. A standard approach to spoken document retrieval is to automatically transcribe spoken documents into word sequences, which can be directly matched against queries. In this approach, the documents including OOV words and words mis-recognized as other words can not be retrieved. To avoid this problem, we propose a novel method of spoken document retrieval considering OOV keywords. One of our approach is to create a index from multiple recognizers outputs to deal with transcribed documents including mis-recognized words. The index becomes better to use multiple recognizers which have different characteristics to one another. The other is to use both word based indexing for in-vocabulary keywords and syllable based indexing for OOV keywords, and to switch them according to in-vocabulary/OOV keywords in the query. Evaluation results clearly show that this approach benefits from advantages of both indexing methods and that the proposed technique is quite effective in robustly retrieving spoken documents.
conference of the international speech communication association | 2004
Masahiko Matsushita; Hiromitsu Nishizaki; Seiichi Nakagawa; Takehito Utsuro
電子情報通信学会技術研究報告 | 2009
Welly Naptali; Masatoshi Tsuchiya; Seiichi Nakagawa
Journal of Natural Language Processing | 1999
Seiichi Nakagawa; Hirotaka Akamatsu; Hiromitsu Nishizaki
情報処理学会研究報告 | 2010
Welly Naptali; Masatoshi Tsuchiya; Seiichi Nakagawa
電子情報通信学会技術研究報告. NLC, 言語理解とコミュニケーション | 2009
Welly Naptali; Masatoshi Tsuchiya; Seiichi Nakagawa
Journal of Natural Language Processing | 2008
Masatoshi Tsuchiya; Toshiyuki Wakita; Ayu Purwarianti; Seiichi Nakagawa
IPSJ SIG Notes | 2008
Tomoyosi Akiba; Kiyoaki Aikawa; Yoshiaki Itoh; Tatsuya Kawahara; Hiroaki Nanjo; Hiromitsu Nishizaki; Norihito Yasuda; Yoichi Yamashita; Tomoko Matsui; Xinhui Hu; Seiichi Nakagawa; Katunobu Itou
電子情報通信学会技術研究報告. NLC, 言語理解とコミュニケーション | 2007
Welly Naptali; Masatoshi Tsuchiya; Seiichi Nakagawa
情報処理学会論文誌 | 2006
雅稔 土屋; Masatoshi Tsuchiya; 武仁 宇津呂; Takehito Utsuro; 俊 松吉; Suguru Matsuyoshi; 理史 佐藤; Satoshi Sato; 聖一 中川; Seiichi Nakagawa