In this paper we present a systematic categorization of the user access authorization exceptions which may occur in conventional role-based access control models. We propose a slightly revised NIST RBAC model which allows us to express all the authorization exceptions we consider. We give a formal definition of the model and show how it can be implemented in DATALOG with negation to give simple...

The administration of access control policies is a task of paramount importance for distributed systems. A crucial analysis problem is to foresee if a set of administrators can give a user an access permission. We consider this analysis problem in the context of the Administrative Role-Based Access Control (ARBAC), one of the most widespread administrative models. Given the difficulty of taking...

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...

We introduce two Bayesian models for unsupervised semantic role labeling (SRL) task. The models treat SRL as clustering of syntactic signatures of arguments with clusters corresponding to semantic roles. The first model induces these clusterings independently for each predicate, exploiting the Chinese Restaurant Process (CRP) as a prior. In a more refined hierarchical model, we inject the intui...

This paper describes a system to solve the joint learning of syntactic and semantic dependencies. An directed graphical model is put forward to integrate dependency relation classification and semantic role labeling. We present a bilayer directed graph to express probabilistic relationships between syntactic and semantic relations. Maximum Entropy Markov Models are implemented to estimate condi...

One of the most widespread framework for the management of access-control policies is Administrative Role Based Access Control (ARBAC). Several automated analysis techniques have been proposed to help maintaining desirable security properties of ARBAC policies. One limitation of many available techniques is that the sets of users and roles are bounded. In this paper, we propose a symbolic frame...

We describe an approach to the coordination of application systems based on the modelling and maintenance of inter-system dependencies expressed as data constraints together with update propagation rules. These dependencies are speciied by a Coordination Model which comprises a Coordination Interface for each application system together with a global Coordination View. A Coordination Interface ...

We present a data and error analysis for semantic role labelling. In a first experiment, we build a generic statistical model for semantic role assignment in the FrameNet paradigm and show that there is a high variance in performance across frames. The main hypothesis of our paper is that this variance is to a large extent a result of differences in the underlying argument structure of the pred...

Role-based access control (RBAC) has significantly simplified the management of users and permissions in computing systems. In dynamic environments, systems are subject to changes, so that the associated configurations need to be updated accordingly in order to reflect the systems’ evolution. Access control update is complex, especially for large-scale systems; because the updated system is exp...

The main problems of data centric and open source project are large number of developers and changes of core framework. Model-View-Control (MVC) design pattern significantly improved the development and adjustments of complex projects. Entity framework as a Model layer in MVC architecture has simplified communication with the database. How often are the new technologies used and whether they ha...