Towards a general theory of action and time
Artificial Intelligence
Temporal logics in AI: semantical and ontological considerations
Artificial Intelligence
Artificial Intelligence - Special issue on knowledge representation
Automatic deduction of temporal information
ACM Transactions on Database Systems (TODS)
Temporal databases: theory, design, and implementation
Temporal databases: theory, design, and implementation
Temporal constraint satisfaction on causal models
Information Sciences: an International Journal
RE´SUME´: a temporal-abstraction system for patient monitoring
Computers and Biomedical Research - Papers presented at the 16th symposium on computer applications in medical care (SCAMC)
The complexity of query evaluation in indefinite temporal constraint databases
Selected papers from the international workshop on Uncertainty in databases and deductive systems
Modeling temporal primitives: back to basics
CIKM '97 Proceedings of the sixth international conference on Information and knowledge management
Supporting valid-time indeterminacy
ACM Transactions on Database Systems (TODS)
Temporal granularity for unanchored temporal data
Proceedings of the seventh international conference on Information and knowledge management
Temporal logic in information systems
Logics for databases and information systems
An information architecture to support the visualization of personal histories
Information Processing and Management: an International Journal
Querying temporal constraint networks in PTIME
AAAI '99/IAAI '99 Proceedings of the sixteenth national conference on Artificial intelligence and the eleventh Innovative applications of artificial intelligence conference innovative applications of artificial intelligence
Maintaining knowledge about temporal intervals
Communications of the ACM
The TSQL2 Temporal Query Language
The TSQL2 Temporal Query Language
Object Database Standard: ODMG-93
Object Database Standard: ODMG-93
Medical Language Processing: Computer Management of Narrative Data
Medical Language Processing: Computer Management of Narrative Data
A general framework for time granularity and its application to temporal reasoning
Annals of Mathematics and Artificial Intelligence
Temporal representation and reasoning in artificial intelligence: Issues and approaches
Annals of Mathematics and Artificial Intelligence
Extensions to SQL for Historical Databases
IEEE Transactions on Knowledge and Data Engineering
The Expressive Power of Temporal Relational Query Languages
IEEE Transactions on Knowledge and Data Engineering
Integrating Calendar Dates and Qualitative Temporal Constraints in the Treatment of Periodic Events
IEEE Transactions on Knowledge and Data Engineering
IEEE Transactions on Knowledge and Data Engineering
Later: Managing Temporal Information Efficiently
IEEE Expert: Intelligent Systems and Their Applications
Querying TSQL2 Databases with Temporal Logic
EDBT '96 Proceedings of the 5th International Conference on Extending Database Technology: Advances in Database Technology
Incomplete Information in Relational Temporal Databases
VLDB '92 Proceedings of the 18th International Conference on Very Large Data Bases
Coalescing in Temporal Databases
VLDB '96 Proceedings of the 22th International Conference on Very Large Data Bases
IJCAI '99 Proceedings of the Sixteenth International Joint Conference on Artificial Intelligence
Evaluating the Completeness of TSQL2
Proceedings of the International Workshop on Temporal Databases: Recent Advances in Temporal Databases
An empirical approach to temporal reference resolution
Journal of Artificial Intelligence Research
IEEE Transactions on Information Technology in Biomedicine
Annals of Mathematics and Artificial Intelligence
Temporalized logics and automata for time granularity
Theory and Practice of Logic Programming
Temporal reasoning for decision support in medicine
Artificial Intelligence in Medicine
Extending temporal databases to deal with telic/atelic medical data
Artificial Intelligence in Medicine
Journal of Biomedical Informatics
CareVis: Integrated visualization of computerized protocols and temporal patient data
Artificial Intelligence in Medicine
Artificial Intelligence in Medicine
Avian influenza: Temporal modeling of a human to human transmission case
Expert Systems with Applications: An International Journal
Visually defining and querying consistent multi-granular clinical temporal abstractions
Artificial Intelligence in Medicine
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The granularity of given temporal information is the level of abstraction at which information is expressed. Different units of measure allow one to represent different granularities. Indeterminacy is often present in temporal information given at different granularities: temporal indeterminacy is related to incomplete knowledge of when the considered fact happened. Focusing on temporal databases, different granularities and indeterminacy have to be considered in expressing valid time, i.e., the time at which the information is true in the modeled reality. In this paper, we propose HMAP (The term is the transliteration of an ancient Greek poetical word meaning “day”.), a temporal data model extending the capability of defining valid times with different granularity and/or with indeterminacy. In HMAP, absolute intervals are explicitly represented by their start,end, and duration: in this way, we can represent valid times as “in December 1998 for five hours”, “from July 1995, for 15 days”, “from March 1997 to October 15, 1997, between 6 and 6:30 p.m.”. HMAP is based on a three-valued logic, for managing uncertainty in temporal relationships. Formulas involving different temporal relationships between intervals, instants, and durations can be defined, allowing one to query the database with different granularities, not necessarily related to that of data. In this paper, we also discuss the complexity of algorithms, allowing us to evaluate HMAP formulas, and show that the formulas can be expressed as constraint networks falling into the class of simple temporal problems, which can be solved in polynomial time.