Hiroaki Sugiyama

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Fine-Tuning a Pre-trained Transformer-Based Encoder-Decoder Model with User-Generated Question-Answer Pairs to Realize Character-Like Chatbots

Lecture notes in electrical engineering (2022)

Koh Mitsuda Ryuichiro Higashinaka Hiroaki Sugiyama Masahiro Mizukami Tetsuya Kinebuchi

10.1007/978-981-19-5538-9_20

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Citations (3)

Development of Character-like Chatbot with Role Play-Based Question Answering and a Large Language Model

Journal of Natural Language Processing (2023)

Koh Mitsuda Ryuichiro Higashinaka Tingxuan Li Hiroaki Sugiyama Masahiro Mizukami

本研究では,単一の人物の大規模な対話データを大規模言語モデルと組み合わせることで,対象人物を再現するチャットボット(なりきりAI)を構築した.さらに,構築したチャットボットの公開実験とそのエラー分析を行うことで,現状の到達点と問題を調査した.その結果,構築されたチャットボットは高い自然さとキャラクタらしさを持つことが明らかになった.さらに,対象人物を再現するチャットボットのエラーは,属性に関するエラーと関係に関するエラーに分けられ,また,自己に関するエラーと他者に関するエラーに分けられることが明らかになった.

Chatbot

10.5715/jnlp.30.1172

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Evaluating coherence in open domain conversational systems

Interspeech 2022 (2014)

Ryuichiro Higashinaka Toyomi Meguro Kenji Imamura Hiroaki Sugiyama Toshiro Makino

Open domain

10.21437/interspeech.2014-38

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Citations (45)

Discrimination of Models Including Doubly Charged Scalar Bosons by Using Tau Lepton Decay Distributions [1]

Hiroaki Sugiyama

10.7566/jpscp.7.010012

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Neutralino dark matter in light Higgs boson scenario

Physics Letters B (2008)

Masaki Asano Shigeki Matsumoto Masato Senami Hiroaki Sugiyama

Light dark matter

Mixed dark matter

Warm dark matter

10.1016/j.physletb.2008.04.042

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Citations (14)

Production of doubly charged scalars from the decay of singly charged scalars in the Higgs triplet model

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology (2011)

A. G. Akeroyd Hiroaki Sugiyama

The existence of doubly charged Higgs bosons (${H}^{\ifmmode\pm\else\textpm\fi{}\ifmmode\pm\else\textpm\fi{}}$) is a distinctive feature of the Higgs triplet model (HTM), in which neutrinos obtain tree-level masses from the vacuum expectation value of a neutral scalar in a triplet representation of $SU(2{)}_{L}$. We point out that a large branching ratio for the decay of a singly charged Higgs boson to a doubly charged Higgs boson via ${H}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{H}^{\ifmmode\pm\else\textpm\fi{}\ifmmode\pm\else\textpm\fi{}}{W}^{*}$ is possible in a sizeable parameter space of the HTM. From the production mechanism ${q}^{\ensuremath{'}}\overline{q}\ensuremath{\rightarrow}{W}^{*}\ensuremath{\rightarrow}{H}^{\ifmmode\pm\else\textpm\fi{}\ifmmode\pm\else\textpm\fi{}}{H}^{\ensuremath{\mp}}$ the above decay mode would give rise to pair production of ${H}^{\ifmmode\pm\else\textpm\fi{}\ifmmode\pm\else\textpm\fi{}}$, with a cross section which can be comparable to that of the standard pair-production mechanism $q\overline{q}\ensuremath{\rightarrow}{Z}^{*}({\ensuremath{\gamma}}^{*})\ensuremath{\rightarrow}{H}^{++}{H}^{--}$. We suggest that the presence of a sizeable branching ratio for ${H}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{H}^{\ifmmode\pm\else\textpm\fi{}\ifmmode\pm\else\textpm\fi{}}{W}^{*}$ could significantly enhance the detection prospects of ${H}^{\ifmmode\pm\else\textpm\fi{}\ifmmode\pm\else\textpm\fi{}}$ in the four-lepton channel. Moreover, the decays ${H}^{0}\ensuremath{\rightarrow}{H}^{\ifmmode\pm\else\textpm\fi{}}{W}^{*}$ and ${A}^{0}\ensuremath{\rightarrow}{H}^{\ifmmode\pm\else\textpm\fi{}}{W}^{*}$ from production of the neutral triplet scalars ${H}^{0}$ and ${A}^{0}$ would also provide an additional source of ${H}^{\ifmmode\pm\else\textpm\fi{}}$, which can subsequently decay to ${H}^{\ifmmode\pm\else\textpm\fi{}\ifmmode\pm\else\textpm\fi{}}$.

Branching fraction

10.1103/physrevd.84.035010

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Citations (84)

Physics at a future Neutrino Factory and super-beam facility

Reports on Progress in Physics (2009)

A. Bandyopadhyay Sandhya Choubey Raj Gandhi Srubabati Goswami B.L. Roberts

The conclusions of the Physics Working Group of the international scoping study of a future Neutrino Factory and super-beam facility (the ISS) are presented. The ISS was carried by the international community between NuFact05, (the 7th International Workshop on Neutrino Factories and Superbeams, Laboratori Nazionali di Frascati, Rome, June 21-26, 2005) and NuFact06 (Ivine, California, 24{30 August 2006). The physics case for an extensive experimental programme to understand the properties of the neutrino is presented and the role of high-precision measurements of neutrino oscillations within this programme is discussed in detail. The performance of second generation super-beam experiments, beta-beam facilities, and the Neutrino Factory are evaluated and a quantitative comparison of the discovery potential of the three classes of facility is presented. High-precision studies of the properties of the muon are complementary to the study of neutrino oscillations. The Neutrino Factory has the potential to provide extremely intense muon beams and the physics potential of such beams is discussed in the final section of the report.

Neutrino Factory

Factory (object-oriented programming)

Solar neutrino problem

10.1088/0034-4885/72/10/106201

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Citations (253)

Lepton flavor violating decaysτ→l¯llandμ→eγin the Higgs triplet model

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology (2009)

A. G. Akeroyd Mayumi Aoki Hiroaki Sugiyama

Singly and doubly charged Higgs bosons in the Higgs triplet model mediate the lepton flavor violating (LFV) decays $\ensuremath{\tau}\ensuremath{\rightarrow}\overline{l}ll$ and $\ensuremath{\mu}\ensuremath{\rightarrow}e\ensuremath{\gamma}$. The lepton flavor violating decay rates are proportional to products of two triplet Yukawa couplings (${h}_{ij}$) which can be expressed in terms of the parameters of the neutrino mass matrix and an unknown triplet vacuum expectation value. We determine the parameter space of the neutrino mass matrix in which a signal for $\ensuremath{\tau}\ensuremath{\rightarrow}\overline{l}ll$ and/or $\ensuremath{\mu}\ensuremath{\rightarrow}e\ensuremath{\gamma}$ is possible at ongoing and planned experiments. The conditions for respecting the stringent upper limit for $\ensuremath{\mu}\ensuremath{\rightarrow}\overline{e}ee$ are studied in detail, with emphasis given to the possibility of $|{h}_{ee}|\ensuremath{\simeq}0$, which can only be realized if Majorana phases are present.

Yukawa potential

Lepton number

10.1103/physrevd.79.113010

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Citations (120)

Towards an open-domain conversational system fully based on natural language processing

International Conference on Computational Linguistics (2014)

Ryuichiro Higashinaka Kenji Imamura Toyomi Meguro Chiaki Miyazaki Nozomi Kobayashi

This paper proposes an architecture for an open-domain conversational system and evaluates an implemented system. The proposed architecture is fully composed of modules based on natural language processing techniques. Experimental results using human subjects show that our architecture achieves significantly better naturalness than a retrieval-based baseline and that its naturalness is close to that of a rule-based system using 149K hand-crafted rules.

Open domain

Baseline (sea)

Source

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Citations (159)

Towards User-friendly Conversational Systems

Deleted Journal (2016)

Hiroaki Sugiyama Ryuichiro Higashinaka Toyomi Meguro

Remarkable progress has been made with conversational systems in recent years, and they are becoming much more common.However, many problems remain to be solved such as errors in speech recognition and the narrow range of tractable dialogue topics.In this article, we introduce our efforts to improve the dialogue quality of our dialogue systems and to prevent dialogue breakdown using multiple dialogue robots.

User Friendly

10.53829/ntr201611fa4

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Citations (2)