One of the most severe problems related to database evolution is how to reflect in the data level the changes that have occurred in the conceptual schema of a database. This is specially relevant when evolution operations affect ISA relationships. In this paper we present our view of the evolution of ISA relationships, focusing on the artifacts that generate the sentences for changing the data ...

The quality of software engineering projects often suffers due to the large gap between the way stakeholders present their requirements and the way analysts capture and express those requirements. With this problem in mind the new method for business rules driven IS requirements specification has been developed. In this paper the architecture of the requirements repository, which is at the core...

Many exciting potential application areas for database technology manage time-varying, spatial information. In contrast, existing database techniques, languages, and associated tools provide little built-in support for the management of such information. The focus of this paper is on enhancing existing conceptual data models with new constructs, improving their ability to conveniently model spa...

Software compatibility and application integration can be achieved using their respective conceptual data models. However, each model may be represented in a different language. While such languages seem similar yet known to be distinct, no unifying framework exists that respects all of their language features. Aiming toward filling this gap, we designed a common, ontology-driven, metamodel of ...

This paper introduces a Conceptual Data Model for Data Warehouse including multidimensional aggregation. It is based on Entity-Relationships data model. The conceptual data model gracefully extends standard Entity-Relationship data model with multidimensional aggregated entities. The model has a clear mathematical theoretic semantics grounded on standard ER semantics and the GMD logic-based mul...

supply chain management has been considered by many researchers in order to coordinate the chain members in this new age so that it is considered as a strategic approach for demands, operations, procurements and managing logistical processes. the present study deals with survey of supply components in supply chain management and their effect on organization performance. the research conceptual ...

In order to build intelligent tutoring agents within games-based learning environments, practitioners must understand the three conceptual models used within Intelligent Tutoring Systems (ITS): the expert or domain model, the student model, and the instructional model. This paper investigates the inter-relationship between these models and how they combine to provide the expected behaviour of i...

INTRODUCTION Patient and public involvement is engaging patients, providers, community representatives, and the public in healthcare planning and decision-making. The purpose of this study was to develop a model for the application of patient and public involvement in decision making in the Iranian healthcare system. METHODS A mixed qualitative-quantitative approach was used to develop a conc...

Due to the central role that conceptual data models play in the design of databases, it is crucial to assure their quality since the early phases of database life cycle. For assessing (and if it is necessary improving) conceptual data model quality it is necessary to dispose of quantitative and objective measures in order to avoid bias in the quality evaluation process. Is in this context where...

Dataflow repositories are databases containing dataflows and their different runs. We propose a formal conceptual data model for such repositories. Our model includes careful formalisations of such features as complex data manipulation, external service calls, subdataflows, and the provenance of output values.