scholarly journals Multi-head Guarded Existential Rules Over Fixed Signatures

2020 ◽  
Author(s):  
Georg Gottlob ◽  
Marco Manna ◽  
Andreas Pieris
Keyword(s):  
Query Answering ◽  
Central Problem ◽  
Rule Based

Guarded existential rules form a robust rule-based language for modelling ontologies. The central problem of ontology-based query answering, as well as the notion of polynomial combined rewritability, have been extensively studied during the last years for this formalism. However, the relevant setting where the underlying signature is considered to be fixed is far from being well understood. All the existing results on ontology-based query answering and polynomial combined rewritability assume rule heads with one atom, while existential rules in real ontologies are typically coming with multi-heads consisting of several atoms. We aim to fill this gap.

scholarly journals Intelligent query answering in rule based systems

1987 ◽  
Vol 4 (3) ◽  
pp. 229-257 ◽  
Author(s):  
Tomasz Imielinski
Keyword(s):  
Query Answering ◽  
Rule Based ◽  
Rule Based Systems

scholarly journals Ontology-Mediated Query Answering for Key-Value Stores

2017 ◽  
Author(s):  
Meghyn Bienvenu ◽  
Pierre Bourhis ◽  
Marie-Laure Mugnier ◽  
Sophie Tison ◽  
Federico Ulliana
Keyword(s):  
Upper Bounds ◽  
Order Logic ◽  
Query Answering ◽  
Query Reformulation ◽  
Rule Based ◽  
Complexity Bounds ◽  
First Order ◽  
Ontology Language ◽  
Ontology Languages ◽  
Computational Properties

We propose a novel rule-based ontology language for JSON records and investigate its computational properties. After providing a natural translation into first-order logic, we identify relationships to existing ontology languages, which yield decidability of query answering but only rough complexity bounds. By establishing an interesting and non-trivial connection to word rewriting, we are able to pinpoint the exact combined complexity of query answering in our framework and obtain tractability results for data complexity. The upper bounds are proven using a query reformulation technique, which can be implemented on top of key-value stores, thereby exploiting their querying facilities.

scholarly journals Foundations of Rule-Based Query Answering

2007 ◽  
pp. 1-153 ◽  
Author(s):  
François Bry ◽  
Norbert Eisinger ◽  
Thomas Eiter ◽  
Tim Furche ◽  
Georg Gottlob ◽  
...  
Keyword(s):  
Query Answering ◽  
Rule Based

The Orchestra as Acting Area in Greek Tragedy

Ramus ◽  
1985 ◽  
Vol 14 (2) ◽  
pp. 75-84 ◽  
Author(s):  
Graham Ley ◽  
Michael Ewans
Keyword(s):  
Greek Tragedy ◽  
Close Relation ◽  
Central Problem ◽  
Classical Drama ◽  
Considerable Experience

For some years past there has been a welcome change of emphasis towards the consideration of staging in books published on Greek tragedy; and yet with that change also a curious failure to be explicit about the central problem connected with all stagecraft, namely that of the acting-area. In this study two scholars with considerable experience of teaching classical drama in performance consider this problem of the acting-area in close relation to major scenes from two Greek tragedies, and suggest some general conclusions. The article must stand to some extent as a critique of the succession of books that has followed the apparently pioneering study of Oliver Taplin, none of which has made any substantial or sustained attempt to indicate where actors might have acted in the performance of Greek tragedy, though most, if not all, have been prepared to discard the concept of a raised ‘stage’ behind the orchestra. Hippolytus (428 BC) is the earliest of the surviving plays of Euripides to involve three speaking actors in one scene. Both Alcestis (438 BC and Medea (431 BC almost certainly require three actors to be performed with any fluency, but surprisingly present their action largely through dialogue and confrontation — surprisingly, perhaps, because at least since 458 BC and the performance of the Oresteia it is clear that three actors were available to any playwright.

Using Conventional Articulation Tests With Highly Unintelligible Children

1992 ◽  
Vol 23 (1) ◽  
pp. 52-60 ◽  
Author(s):  
Pamela G. Garn-Nunn ◽  
Vicki Martin
Keyword(s):  
Test Results ◽  
Phonological Processes ◽  
Rule Based ◽  
Severity Level ◽  
Error Sensitivity ◽  
Conventional Tests ◽  
Severity Levels ◽  
Conventional Test ◽  
Impaired Children

This study explored whether or not standard administration and scoring of conventional articulation tests accurately identified children as phonologically disordered and whether or not information from these tests established severity level and programming needs. Results of standard scoring procedures from the Assessment of Phonological Processes-Revised, the Goldman-Fristoe Test of Articulation, the Photo Articulation Test, and the Weiss Comprehensive Articulation Test were compared for 20 phonologically impaired children. All tests identified the children as phonologically delayed/disordered, but the conventional tests failed to clearly and consistently differentiate varying severity levels. Conventional test results also showed limitations in error sensitivity, ease of computation for scoring procedures, and implications for remediation programming. The use of some type of rule-based analysis for phonologically impaired children is highly recommended.

Haunted by a Doppelgänger

2014 ◽  
Vol 61 (1) ◽  
pp. 12-22 ◽  
Author(s):  
Bettina von Helversen ◽  
Stefan M. Herzog ◽  
Jörg Rieskamp
Keyword(s):  
Relevant Information ◽  
Psychological Research ◽  
Decision Makers ◽  
Human Judgment ◽  
Rule Based ◽  
New Employees ◽  
High Performing ◽  
Facial Similarity ◽  
Similarity Effect ◽  
Judgment Strategy

Judging other people is a common and important task. Every day professionals make decisions that affect the lives of other people when they diagnose medical conditions, grant parole, or hire new employees. To prevent discrimination, professional standards require that decision makers render accurate and unbiased judgments solely based on relevant information. Facial similarity to previously encountered persons can be a potential source of bias. Psychological research suggests that people only rely on similarity-based judgment strategies if the provided information does not allow them to make accurate rule-based judgments. Our study shows, however, that facial similarity to previously encountered persons influences judgment even in situations in which relevant information is available for making accurate rule-based judgments and where similarity is irrelevant for the task and relying on similarity is detrimental. In two experiments in an employment context we show that applicants who looked similar to high-performing former employees were judged as more suitable than applicants who looked similar to low-performing former employees. This similarity effect was found despite the fact that the participants used the relevant résumé information about the applicants by following a rule-based judgment strategy. These findings suggest that similarity-based and rule-based processes simultaneously underlie human judgment.

A Neurocomputational Model of Criterion Learning in Rule-Based Categorization

2012 ◽  
Author(s):  
Sebastien Helie ◽  
Shawn W. Ell ◽  
J. Vincent Filoteo ◽  
Brian D. Glass ◽  
W. W. Todd Maddox
Keyword(s):  
Rule Based ◽  
Criterion Learning
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