Taxonomy of time models in databases

Ling, D. H. O.; Bell, David A.

doi:10.1016/0950-5849(90)90180-y

Cited by 14 publications

(8 citation statements)

References 9 publications

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“…In these domains, it is necessary to keep the old data of time for which the data is valid. A time dimension is associated with a database either at attribute level (Clifford, 1982) or the tuple level (Gadia & Yeung, 1991;Ling & Bell, 1990) to keep the history of data. Such a DBMS is referred to as a temporal database (Dutta, 1989;Gadia & Yeung, 1991).…”

Section: Database Management Systemsmentioning

confidence: 99%

Modeling Historically mHealth Care Environments

Naqvi

Shah²

2018

International Journal of Reliable and Quality E-Healthcare

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This article describes how mobile health (mHealth) has grown from infancy stage to toddler stage due to advances in the technology. It has the potential for further growth as it is low-cost health care. For its further growth, it is necessary to widen its scope. In this article, a proposal is presented to develop a new and advanced mHealth care system, and its first step that is modelling is reported. In modelling, historically, a model of a temporal object system (TOS) is used. The model empowers users of the proposed mHealth care system to define, retrieve and manipulate all objects historically, in a uniform fashion, and also to keep historically the changes that occur to the objects. Later, these historically stored objects can be consulted during making essential and crucial decisions about the patients (objects) and other objects of the system, and it can save both lives and money. Also, the stored objects can be used in the future planning and research.

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Section: Database Management Systemsmentioning

confidence: 99%

Modeling Historically mHealth Care Environments

Naqvi

Shah²

2018

International Journal of Reliable and Quality E-Healthcare

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“…The granularity of time de- pends on the application domain. In the TOS, we use time point model [6,14]. A time point is referred to as a time instance.…”

Section: Time Dimension In Tosmentioning

confidence: 99%

“…The value of time associated with a data object is determined by the system or assigned by the user. If a time value is assigned by the system, then it is referred to as a physical time such as transaction time, while if it is assigned by the user, then it is referred to as a logical time such as user-defined time [14].…”

Section: Introductionmentioning

confidence: 99%

Operators of the temporal object system and their implementation

Shah¹

2004

Information Sciences

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“…Many researchers realized the richness of the semantics of temporal data [15], [31] and provided various operators in different query languages [4], [34], [38]. Much work dealing with the semantics of temporal data modeling has appeared in the temporal database literature (e.g., [9], [16], [25], [30], [23]). Toman [41] has pointed out some problems connected with the definition of a clear semantics for the approaches where the validity times of tuples and attributes are encoded using time intervals.…”

Section: Introductionmentioning

confidence: 99%

Reconciling point-based and interval-based semantics in temporal relational databases: a treatment of the telic/atelic distinction

Terenziani

Snodgrass

2004

IEEE Trans. Knowl. Data Eng.

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Abstract-The analysis of the semantics of temporal data and queries plays a central role in the area of temporal databases. Although many different algebrae and models have been proposed, almost all of them are based on a point-based (snapshot) semantics for data. On the other hand, in the areas of linguistics, philosophy, and, recently, artificial intelligence, an oft-debated issue concerns the use of an interval-based versus a point-based semantics. In this paper, we first show some problems inherent in the adoption of a point-based semantics for data, then argue that these problems arise because there is no distinction drawn in the data between telic and atelic facts. We then introduce a three-sorted temporal model and algebra including coercion functions for transforming relations of one sort into relations of the other at query time which properly copes with these issues.

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Taxonomy of time models in databases

Cited by 14 publications

References 9 publications

Modeling Historically mHealth Care Environments

Modeling Historically mHealth Care Environments

Operators of the temporal object system and their implementation

Reconciling point-based and interval-based semantics in temporal relational databases: a treatment of the telic/atelic distinction

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