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Cognitive Architecture of an Agent for Human-Agent Dialogues
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för datavetenskap.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för datavetenskap.
2014 (Engelska)Ingår i: Highlights of Practical Applications of Heterogeneous Multi-Agent Systems: the PAAMS Collection, Springer, 2014, Vol. 430, s. 89-100Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

This paper proposes a cognitive architecture of an intelligent agent that can have a dialogue with a human agent on health-related topics. This architecture consists of four main components, namely, the Belief Base, the Dialogue Manager, the Task Manager and the Plan Generator. Each component has sub-components that perform a set of tasks for the purpose to enable the agent to be enrolled in a dialogue. In this paper the particular sub-component of the Dialogue Manager, the Dialogue Strategy has been discussed in detail. A notion of scheme is introduced, which functions as a template with variables that are instantiated each time a state is entered. The agent’s dialogue strategy is implemented as a combination of the schemes and the state transitions that the agent makes in response to the human’s request. We used a combination of finite-state and agent-based dialogue strategies for dialogue management. This combined dialogue strategy enables a multi-topic dialogue between a human and an agent.

Ort, förlag, år, upplaga, sidor
Springer, 2014. Vol. 430, s. 89-100
Serie
Communications in Computer and Information Science, ISSN 1865-0929 ; 430
Nyckelord [en]
Human-computer interaction, dialogue, agent, architecture
Nationell ämneskategori
Datavetenskap (datalogi)
Identifikatorer
URN: urn:nbn:se:umu:diva-89675DOI: 10.1007/978-3-319-07767-3_9ISI: 000357810200009Scopus ID: 2-s2.0-84903519279ISBN: 978-3-319-07767-3 (tryckt)ISBN: 978-3-319-07766-6 (tryckt)OAI: oai:DiVA.org:umu-89675DiVA, id: diva2:722812
Konferens
International Conference on Practical Applications of Agents and Multi-Agent Systems (PAAMS), JUN 04-06, 2014, Salamanca, SPAIN
Tillgänglig från: 2014-06-09 Skapad: 2014-06-09 Senast uppdaterad: 2023-03-24Bibliografiskt granskad
Ingår i avhandling
1. Adaptive human-agent dialogues for reasoning about health
Öppna denna publikation i ny flik eller fönster >>Adaptive human-agent dialogues for reasoning about health
2014 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The aim of this research is to develop new theories, methods and technology, which enables adaptive and personalised dialogues between a human and a software agent, to handle everyday queries about health that are perceived as meaningful and useful to the human. Some of the challenges to build such human-agent dialogue system are the following. The agent needs to have knowledge about the human, the topic of the dialogue, the knowledge domain of the topic, and also about the physical and social environment. Moreover, the agent must know about itself, its role, purpose and limitations. It must know how to be cooperative and be able to behave and express with empathy while conducting a dialogue activity. In some situations, it needs to reason and make decisions about a topic together with the human and about its own behavior. To be able to do this, it needs the capability to evaluate its behavior in the context in which the dialogue takes place. These challenges are addressed by developing formal semantic models to provide the agent with tools to build their knowledge and to be able to reason and make decisions. These models were developed based on literature studies, theories of human activity, argumentation theory, personas and scenarios.

The models were formalised and implemented using Semantic Web technology, and integrated into a human-agent dialogue system. The system was evaluated with a group of therapists and a group of elderly people, who showed curiosity and interest in having dialogues with a software agent on various topics.

The formal models that the agent constructs are adapted to the specific situation and to the human actor participating in a dialogue. They are based on four models: a model with knowledge about the human actor, a model of itself, a domain model, and a dialogue activity model. The dialogue activity is based on argumentation schemes, which function as patterns of reasoning and for the dialogue execution. These models allow the agent and the human actor to conduct flexible and nested sub-dialogues with different purposes within a main dialogue about a topic. The agent can adapt its moves to the human actor's trail of reasoning, to the human's priorities and goals, and to some human's emotional state. A method for the agent to be able to evaluate its behavior was also developed and evaluated. The proportion of appropriate moves in relation to the local context of earlier moves in the dialogue was 90% in the pilot study, which indicates that the agent's strategies for selecting moves can be improved.

Future research will focus on further development of reasoning methods, learning and assessment methods, and interface design. The results will be applied to additional knowledge domains to test its domain independence and will be evaluated with different groups of potential users.

Ort, förlag, år, upplaga, sidor
Umeå: Umeå universitet, 2014. s. 32
Serie
Report / UMINF, ISSN 0348-0542 ; 14.19
Nationell ämneskategori
Datavetenskap (datalogi)
Identifikatorer
urn:nbn:se:umu:diva-96756 (URN)978-91-7601-135-5 (ISBN)
Handledare
Tillgänglig från: 2014-12-02 Skapad: 2014-12-02 Senast uppdaterad: 2018-06-07Bibliografiskt granskad

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Baskar, JayalakshmiLindgren, Helena

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