no code implementations • 26 Mar 2024 • Quratul-ain Mahesar, Nir Oren, Wamberto W. Vasconcelos
Our research considers the inverse of the standard reasoning problem, i. e., given an abstract argumentation framework and a set of justified arguments, we compute what the possible preferences over arguments are.
no code implementations • 21 Jan 2024 • Assaf Libman, Nir Oren, Bruno Yun
While different gradual semantics have been proposed in the literature, in this paper, we identify a large family of weighted gradual semantics, called abstract weighted based gradual semantics.
no code implementations • 18 Sep 2023 • Adarsa Sivaprasad, Ehud Reiter, Nava Tintarev, Nir Oren
A task based evaluation of mental models of these participants provide valuable feedback to enhance narrative global explanations.
1 code implementation • 29 Nov 2022 • Nir Oren, Bruno Yun
The main contribution of our work is to demonstrate that the associated decision problem, i. e., whether a set of attacks can exist which allows the final acceptability degrees to occur for given initial weights, is NP-complete for the weighted h-categoriser and cardinality-based semantics, and is polynomial for the weighted max-based semantics, even for the complete version of the problem (where all initial weights and final acceptability degrees are known).
no code implementations • 8 Apr 2022 • Bruno Yun, Nir Oren, Madalina Croitoru
In this paper, we place ourselves in the context of human robot interaction and address the problem of cognitive robot modelling.
no code implementations • 2 Mar 2022 • Nir Oren, Bruno Yun, Assaf Libman, Murilo S. Baptista
Gradual semantics within abstract argumentation associate a numeric score with every argument in a system, which represents the level of acceptability of this argument, and from which a preference ordering over arguments can be derived.
no code implementations • 1 Feb 2022 • Nir Oren, Bruno Yun, Srdjan Vesic, Murilo Baptista
A sub-class of such semantics, the so-called weighted semantics, takes, in addition to the graph structure, an initial set of weights over the arguments as input, with these weights affecting the resultant argument ranking.
no code implementations • 6 Oct 2020 • Nir Oren, Felipe Meneguzzi
Societal rules, as exemplified by norms, aim to provide a degree of behavioural stability to multi-agent societies.
no code implementations • 19 Jun 2020 • Bruno Yun, Srdjan Vesic, Nir Oren
In this paper we describe an argumentation-based representation of normal form games, and demonstrate how argumentation can be used to compute pure strategy Nash equilibria.
no code implementations • 12 May 2020 • Quratul-ain Mahesar, Nir Oren, Wamberto W. Vasconcelos
Various structured argumentation frameworks utilize preferences as part of their standard inference procedure to enable reasoning with preferences.
no code implementations • 26 Apr 2019 • Ramon Fraga Pereira, Nir Oren, Felipe Meneguzzi
Assessing whether an agent has abandoned a goal or is actively pursuing it is important when multiple agents are trying to achieve joint goals, or when agents commit to achieving goals for each other.
no code implementations • 26 Apr 2019 • Ramon Fraga Pereira, Nir Oren, Felipe Meneguzzi
The task of recognizing goals and plans from missing and full observations can be done efficiently by using automated planning techniques.
no code implementations • 20 Apr 2018 • Juan Afanador, Nir Oren, Murilo S. Baptista
Delegation allows an agent to request that another agent completes a task.
no code implementations • 23 Sep 2017 • Beishui Liao, Nir Oren, Leendert van der Torre, Serena Villata
To resolve conflicts among norms, various nonmonotonic formalisms can be used to perform prioritized normative reasoning.
no code implementations • 13 Jan 2017 • Zimi Li, Nir Oren, Simon Parsons
In this paper we investigate the links between instantiated argumentation systems and the axioms for non-monotonic reasoning described in [9] with the aim of characterising the nature of argument based reasoning.
no code implementations • 19 Nov 2013 • Chatschik Bisdikian, Federico Cerutti, Yuqing Tang, Nir Oren
In this paper we describe a decision process framework allowing an agent to decide what information it should reveal to its neighbours within a communication graph in order to maximise its utility.
no code implementations • 19 Nov 2013 • Federico Cerutti, Alice Toniolo, Nir Oren, Timothy J. Norman
Computational trust mechanisms aim to produce trust ratings from both direct and indirect information about agents' behaviour.