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  1.  72
    Recurrent neural network-based models for recognizing requisite and effectuation parts in legal texts.Truong-Son Nguyen, Le-Minh Nguyen, Satoshi Tojo, Ken Satoh & Akira Shimazu - 2018 - Artificial Intelligence and Law 26 (2):169-199.
    This paper proposes several recurrent neural network-based models for recognizing requisite and effectuation parts in Legal Texts. Firstly, we propose a modification of BiLSTM-CRF model that allows the use of external features to improve the performance of deep learning models in case large annotated corpora are not available. However, this model can only recognize RE parts which are not overlapped. Secondly, we propose two approaches for recognizing overlapping RE parts including the cascading approach which uses the sequence of BiLSTM-CRF models (...)
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  2.  38
    Encoded summarization: summarizing documents into continuous vector space for legal case retrieval.Vu Tran, Minh Le Nguyen, Satoshi Tojo & Ken Satoh - 2020 - Artificial Intelligence and Law 28 (4):441-467.
    We present our method for tackling a legal case retrieval task by introducing our method of encoding documents by summarizing them into continuous vector space via our phrase scoring framework utilizing deep neural networks. On the other hand, we explore the benefits from combining lexical features and latent features generated with neural networks. Our experiments show that lexical features and latent features generated with neural networks complement each other to improve the retrieval system performance. Furthermore, our experimental results suggest the (...)
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  3.  75
    Event, state, and process in arrow logic.Satoshi Tojo - 1999 - Minds and Machines 9 (1):81-103.
    Artificial agents, which are embedded in a virtual world, need to interpret a sequence of commands given to them adequately, considering the temporal structure for each command. In this paper, we start with the semantics of natural language and classify the temporal structures of various eventualities into such aspectual classes as action, process, and event. In order to formalize these temporal structures, we adopt Arrow Logic. This logic specifies the domain for the valuation of a sentence as an arrow. We (...)
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  4.  40
    A Generalization of Beall’s Off-Topic Interpretation.Yang Song, Hitoshi Omori, Jonas R. B. Arenhart & Satoshi Tojo - 2024 - Studia Logica 112 (4):893-932.
    In one of his papers, JC Beall advanced a new and interesting interpretation of Weak Kleene logic, in terms of on-topic/off-topic. In brief, Beall suggests to read the third value as _off-topic_, whereas the two classical values are read as _true and on-topic_ and _false and on-topic_. Building on Beall’s new interpretation, the aim of this paper is threefold. First, we discuss two motivations to enrich Beall’s interpretation, and offer an alternative semantic framework that reflects our motivations. Second, by making (...)
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  5.  29
    Dynamic epistemic logic of belief change in legal judgments.Pimolluck Jirakunkanok, Katsuhiko Sano & Satoshi Tojo - 2018 - Artificial Intelligence and Law 26 (3):201-249.
    This study realizes belief/reliability change of a judge in a legal judgment by dynamic epistemic logic. A key feature of DEL is that possibilities in an agent’s belief can be represented by a Kripke model. This study addresses two difficulties in applying DEL to a legal case. First, since there are several methods for constructing a Kripke model, our question is how we can construct the model from a legal case. Second, since this study employs several dynamic operators, our question (...)
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  6.  27
    First international workshop on juris-informatics.Katsumi Nitta, Ken Satoh & Satoshi Tojo - 2008 - In Takashi Washio, Ken Satoh, Hideaki Takeda & Akihiro Inokuchi (eds.), New Frontiers in Artificial Intelligence. Springer. pp. 347--348.
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  7.  17
    Overview of JURISIN 2008.Katsumi Nitta, Ken Satoh & Satoshi Tojo - 2009 - In Hiromitsu Hattori, Takahiro Kawamura, Tsuyoshi Ide, Makoto Yokoo & Yohei Murakami (eds.), New Frontiers in Artificial Intelligence: JSAI 2008 Conference and Workshops, Asahikawa, Japan, June 11-13, 2008, Revised Selected Papers. Springer. pp. 211--212.
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  8.  27
    Dynamic Epistemic Logic for Channel-Based Agent Communication.Katsuhiko Sano & Satoshi Tojo - 2013 - In Kamal Lodaya (ed.), Logic and Its Applications. Springer. pp. 109--120.
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  9.  45
    Similarity of legal cases: From temporal relations of affairs. [REVIEW]Satoshi Tojo & Katsumi Nitta - 1997 - Artificial Intelligence and Law 5 (1-2):161-176.
    Case-based reasoning has played an important role in legal reasoning systems. As one criteria for similarity of cases, temporal relationsamong affairs in legal cases should be compared. Thus far in many legalreasoning systems, cases have been described as sequences of pointwiseevents, or at best, simple time intervals, and they have been related bypredicates such as before, after, while,and so on. However, such relations may depend on each implementer'spersonal view, and also require much labor to write down by hand. In this (...)
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