Implementation and Evaluation of Personal Ontology Building System with Virtual Agent

  • Shota NakataniEmail author
  • Sachio Saiki
  • Masahide Nakamura
  • Kiyoshi Yasuda
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 11582)


Integrating the virtual agent, IoT, and cloud technologies, we have been developing a communication care system, where a person with dementia can talk to an agent every day at home. In order to achieve active conversations with a person with dementia, it is essential to personalize topics to every individual person with dementia. In this paper, we propose a method that represents and manages “the knowledge of individual person” (Personal Ontology) with Linked Data, in order to generate person-centered topics to the individuals. The proposed method with Linked Data does not only enable flexible management of personal ontologies, but also does not only represent complex structure in the ontlogies. Moreover, connecting the data to the external Linked Open Data makes it efficient to obtain various knowledge relevant to the conversation from the wisdom of crowds in the Internet. Also, in this paper, based on the proposed method, we develop a prototype system which dynamically builds Personal Ontology through the conversations between the user and virtual agent. Specifically, virtual agent inquires of the user (U) the attribute (P) such as hobbies, favorite singers and any others. Then virtual agent collects the answers (O) of the user. After that, personal information represented by tuple \(\langle U, P, O \rangle \) is added to Personal Ontology. Furthermore, we confirm collectability of Personal Ontology through the prototype system by experiments with a few subjects.


Linked Data Personal Ontology Home care Virtual agent 



This research was partially supported by the Japan Ministry of Education, Science, Sports, and Culture [Grant-in-Aid for Scientific Research (B) (16H02908, 18H03242, 18H03342), Grant-in-Aid for Scientific Research (A) (17H00731)], and Tateishi Science and Technology Foundation (C) (No. 2177004).


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Shota Nakatani
    • 1
    Email author
  • Sachio Saiki
    • 1
  • Masahide Nakamura
    • 1
    • 2
  • Kiyoshi Yasuda
    • 3
  1. 1.Graduate School of System InformaticsKobe UniversityKobeJapan
  2. 2.Riken AIPChuo-kuJapan
  3. 3.Osaka Institute of TechnologyOsakaJapan

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