Object-role Modeling (ORM) is a fact-oriented modeling approach for specifying, transforming, and querying information at a conceptual level. Unlike Entity-Relationship modeling and Unified Modeling Language class diagrams, fact-oriented modeling is attribute-free, treating all elementary facts as relationships. For information modeling, fact-oriented graphical notations are typically far more ...

nowadays, due to increasing the complexity of ic engines, calibration task becomes more severe and the need to use surrogate models for investigating of the engine behavior arises. accordingly, many black box modeling approaches have been used in this context among which network based models are of the most powerful approaches thanks to their flexible structures. in this paper four network base...

This paper proposes extensions to the Object-Role Modeling approach to support schema transformations that eliminate unneeded columns that may arise from standard relational mapping procedures. A “unique where true” variant of the external uniqueness constraint is introduced to allow roles spanned by such constraints to occur in unary fact types. This constraint is exploited to enable graphic p...

The art of System Dynamics (SD) modeling lies in discovering and representing the feedback processes and other elements that determine the dynamics of a system. However, SD shows a lack of means for discovering and expressing precise, language-based concepts in domains. Therefore, we choose to use Object-Role Modeling (ORM) to add high quality formal conceptualization to SD modeling and Petri N...

Constraint is an essential aspect of RBAC and is sometimes argued to be the principle motivation for RBAC. However, most of role mining algorithms don’t consider the constraint. Furthermore, they just compare the least cost of the authorization process while don’t consider how to assess the accuracy of the derived role state, thus providing the motivation for this work. In this paper, we first ...

Modern database technology has all the hallmarks of the successful technology. The relational model has sufficient flexibility for the expression of a large variety of interesting business phenomena; yet it has sufficient rigidity to offer great leverage. The result is that we can describe our business information in a very high level language such as the graphical NIAM schema language; and lea...

Role-based access control (RBAC) is widely used in organizations for access management. While basic RBAC concepts are present in modern systems, such as operating systems or database management systems, more advanced concepts like history-based separation of duty are not. In this work, we present an approach that validates advanced organizational RBAC policies using a model-based approach again...

Abstract Invisibility, robustness and blindness are three difficult points for 3D model information hiding. In this paper, a new robust and blind information hiding algorithm for 3D models is proposed. Skeleton of 3D models is extracted, and skeleton points are obtained inside the objects at the same time. Taking skeleton points as centers, EMIS are obtained according to Euclidean Maximum Inscr...