Kiyoaki Aikawa


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Designing an Evaluation Framework for Spoken Term Detection and Spoken Document Retrieval at the NTCIR-9 SpokenDoc Task
Tomoyosi Akiba | Hiromitsu Nishizaki | Kiyoaki Aikawa | Tatsuya Kawahara | Tomoko Matsui
Proceedings of the Eighth International Conference on Language Resources and Evaluation (LREC'12)

We describe the evaluation framework for spoken document retrieval for the IR for the Spoken Documents Task, conducted in the ninth NTCIR Workshop. The two parts of this task were a spoken term detection (STD) subtask and an ad hoc spoken document retrieval subtask (SDR). Both subtasks target search terms, passages and documents included in academic and simulated lectures of the Corpus of Spontaneous Japanese. Seven teams participated in the STD subtask and five in the SDR subtask. The results obtained through the evaluation in the workshop are discussed.


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Test Collections for Spoken Document Retrieval from Lecture Audio Data
Tomoyosi Akiba | Kiyoaki Aikawa | Yoshiaki Itoh | Tatsuya Kawahara | Hiroaki Nanjo | Hiromitsu Nishizaki | Norihito Yasuda | Yoichi Yamashita | Katunobu Itou
Proceedings of the Sixth International Conference on Language Resources and Evaluation (LREC'08)

The Spoken Document Processing Working Group, which is part of the special interest group of spoken language processing of the Information Processing Society of Japan, is developing a test collection for evaluation of spoken document retrieval systems. A prototype of the test collection consists of a set of textual queries, relevant segment lists, and transcriptions by an automatic speech recognition system, allowing retrieval from the Corpus of Spontaneous Japanese (CSJ). From about 100 initial queries, application of the criteria that a query should have more than five relevant segments that consist of about one minute speech segments yielded 39 queries. Targeting the test collection, an ad hoc retrieval experiment was also conducted to assess the baseline retrieval performance by applying a standard method for spoken document retrieval.


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Corpus-Based Discourse Understanding in Spoken Dialogue Systems
Ryuichiro Higashinaka | Mikio Nakano | Kiyoaki Aikawa
Proceedings of the 41st Annual Meeting of the Association for Computational Linguistics


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Spoken Dialogue Control Based on a Turn-minimization Criterion Depending on the Speech Recognition Accuracy
Norihi Yasuda | Kohji Dohsaka | Kiyoaki Aikawa
Proceedings of the Second SIGdial Workshop on Discourse and Dialogue


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WIT: A Toolkit for Building Robust and Real-Time Spoken Dialogu Systems
Mikio Nakano | Noboru Miyazaki | Norihito Yasuda | Akira Sugiyama | Jun-ichi Hirasawa | Kohji Dohsaka | Kiyoaki Aikawa
1st SIGdial Workshop on Discourse and Dialogue