Results 261 to 270 of about 9,547,086 (304)
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Proceedings of the 14th International Conference on Computer Systems and Technologies, 2013
In this paper the model PER (Process Entity Relationships) for semantic data modeling is presented, based on process and architectural approach. Terms, symbols and conventions used are explained. The levels of the model were described, and some example models are given.
Hristo Tujarov +2 more
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In this paper the model PER (Process Entity Relationships) for semantic data modeling is presented, based on process and architectural approach. Terms, symbols and conventions used are explained. The levels of the model were described, and some example models are given.
Hristo Tujarov +2 more
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ACM Transactions on Database Systems, 1995
In this article, we present an extended relational algebra with universally or existentially quantified classes as attribute values. The proposed extension can greatly enhance the expressive power of relational systems, and significantly reduce the size of a database, at small additional computational cost.
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In this article, we present an extended relational algebra with universally or existentially quantified classes as attribute values. The proposed extension can greatly enhance the expressive power of relational systems, and significantly reduce the size of a database, at small additional computational cost.
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Data Dictionary und Data Modeler
1998Das Data Dictionary (DDIC) enthalt alle Informationen uber Struktur, Bezeichnungen und Be-ziehungen von Daten des R/3-Systems. Das Data Dictionary verwaltet keinerlei Nutzdaten, Son-dern nur sog, Metadaten. Andereseits wird es-wie die Nutzdaten auch-in der R/3-Datenbank abgelegt.
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1995
IDEF1X is a method for accomplishing logical database design for relational databases. This paper will give the reader an introduction to the methodology and terminology used as well as a summary of the syntax and semantics of IDEF1X.
Adelsberger, Heimo H., Körner, Frank
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IDEF1X is a method for accomplishing logical database design for relational databases. This paper will give the reader an introduction to the methodology and terminology used as well as a summary of the syntax and semantics of IDEF1X.
Adelsberger, Heimo H., Körner, Frank
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1998
While schema descriptions are a necessity for large database applications, many current hypermedia applications have been developed without semantic modeling. Addressing these shortcomings several modeling techniques for hypermedia systems have been developed recently, which extend known domain modeling techniques from the database and software ...
Peter Fröhlich 0001 +2 more
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While schema descriptions are a necessity for large database applications, many current hypermedia applications have been developed without semantic modeling. Addressing these shortcomings several modeling techniques for hypermedia systems have been developed recently, which extend known domain modeling techniques from the database and software ...
Peter Fröhlich 0001 +2 more
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1987
The censored normal regression model considered by Tobin (1958), also commonly known as the ‘tobit’ model, is the following: $$y_i^* = \beta {x_i} + {u_i}.\quad {u_i} \sim IN(0,{\sigma ^2})$$ The observed y i are related to y i * according to the relationship $$\eqalign{ & {y_i} = y_i^*\quad if\,y_i^* > {y_0} \cr & = {y_0}\quad \;\quad ...
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The censored normal regression model considered by Tobin (1958), also commonly known as the ‘tobit’ model, is the following: $$y_i^* = \beta {x_i} + {u_i}.\quad {u_i} \sim IN(0,{\sigma ^2})$$ The observed y i are related to y i * according to the relationship $$\eqalign{ & {y_i} = y_i^*\quad if\,y_i^* > {y_0} \cr & = {y_0}\quad \;\quad ...
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2018
The research proposes a new approach to data quality management presenting three groups of DSL (Domain Specific Language). The first language group uses concept of data object in order to describe data to be analysed, the second group describes the requirements on data quality, and the third group describes data quality management process. The proposed
Zane Bicevska +2 more
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The research proposes a new approach to data quality management presenting three groups of DSL (Domain Specific Language). The first language group uses concept of data object in order to describe data to be analysed, the second group describes the requirements on data quality, and the third group describes data quality management process. The proposed
Zane Bicevska +2 more
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Models AND data; data AND models
Journal of Contaminant Hydrology, 2003David, Lerner +3 more
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2015
The modelling of maintenance data starts with the black-box approach (where the model selection is based solely on the maintenance data) and then through the grey-box approach for proper analysis (where one can gain insights to build better models). These models allow for more effective maintenance of the object.
Karim, M. R. +2 more
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The modelling of maintenance data starts with the black-box approach (where the model selection is based solely on the maintenance data) and then through the grey-box approach for proper analysis (where one can gain insights to build better models). These models allow for more effective maintenance of the object.
Karim, M. R. +2 more
openaire +3 more sources