Operating Procedures for Precise Time and Time Interval Equipments

1981 ◽  
Author(s):  
NAVAL OBSERVATORY WASHINGTON DC
Keyword(s):  
Time Interval ◽  
Precise Time

Dealing with Precise and Imprecise Temporal Data in Crisp Ontology

2020 ◽  
Vol 15 (2) ◽  
pp. 30-49 ◽  
Author(s):  
Fatma Ghorbel ◽  
Fayçal Hamdi ◽  
Elisabeth Métais
Keyword(s):  
Set Theory ◽  
Temporal Reasoning ◽  
Time Interval ◽  
Temporal Data ◽  
Time Intervals ◽  
Time Points ◽  
Interval Algebra ◽  
Precise Time ◽  
Time Point

This article proposes a crisp-based approach for representing and reasoning about concepts evolving in time and of their properties in terms of qualitative relations (e.g., “before”) in addition to quantitative ones, time intervals and points. It is not only suitable to handle precise time intervals and points, but also imprecise ones. It extends the 4D-fluents approach with crisp components to represent handed data. It also extends the Allen's interval algebra. This extension allows reasoning about imprecise time intervals. Compared to related work, it is based on crisp set theory. These relations preserve many properties of the original algebra. Their definitions are adapted to allow relating a time interval and a time point, and two time points. All relations can be used for temporal reasoning by means of transitivity tables. Finally, it proposes a crisp ontology that based on the extended Allen's algebra instantiates the 4D-fluents-based representation.

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