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1	Models for authorization and conflict resolution Ruan, Chun, University of Western Sydney, College of Science, Technology and Environment, School of Computing and Information Technology January 2003 (has links) Access control is a significant issue in any secure computer system. Authorization models provide a formalism and framework for specifying and evaluating access control policies that determine how access is granted and delegated among particular users. The aim of this dissertation is to investigate flexible decentralized authorization model supporting authorization delegation, both positive and negative authorization, and conflict resolution. A graph based authorization framework is proposed which can support authorization delegations and both positive and negative authorizations. In particular, it is shown that the existing conflict resolution methods are limited when applied to decentralized authorization models and cyclic authorizations can even lead to undesirable situations. A new conflict resolution policy is then proposed, which can support well controlled delegation by giving predecessors higher priorities along the delegation path. The thesis provides a formal description of the proposed model and detailed descriptions of algorithms to implement it. The model is represented using labelled digraphs, which provide a formal basis for proving the semantic correctness of the model. A weighted graph based model is presented which allows grantors to further express degrees of certainties about their granting of authorizations. The work is further extended to consider more complex domains where subjects, objects and access rights are hierarchically structured and authorization inheritance along the hierarchies taken into account. A precise semantics is given which is based on stable model semantics, and, several important properties of delegatable authorization programs investigated. The framework provides users a reasonable method to express complex security policy. To address the many situations in which users may need to be granted or delegated authorizations for a limited period of time, a temporal decentralized authorization model is proposed in which temporal authorization delegations and negations are allowable. Proper semantic properties are further investigated. Finally, as an application, the thesis shows how the proposed authorization model can be used in a e-consent system on health data. A system architecture for e-consent is presented and different types of e-consent models discussed. The proposed model is shown to provide users a good framework for representing and evaluating these models. / Doctor of Philosphy (PhD) access control security authorizations delegations conflict resolution semantics algorithm graph e-consent system architecture hierarchy framework
2	La sécurisation des permis de construire contre les recours abusifs / To strengthen legal security of building permits against the excessive proceedings Boussemart, Déborah 09 July 2015 (has links) La présente thèse s'intéresse à la systématisation des menaces d'annulation des permis de construire. Elle a pour objet d'analyser la réalité des recours abusifs devant le juge administratif français. Le phénomène de multiplication des recours abusifs pose le problème de l'instrumentalisation du juge par des requérants malveillants. Cette instrumentalisation transforme le prétoire en une sorte de marché juridictionnel et se traduit en pratique par des coûts contentieux et transactionnels de plus en plus lourds pour les bénéficiaires d'autorisation d'urbanisme. Des instruments de régulation procédurale existent mais sont apparus insuffisants jusqu'à la réforme du contentieux d'urbanisme de 2013. Cette réforme apporte des solutions innovantes. L'optimisme pousse à croire que ces mesures seront efficaces, mais un brin de pessimisme conduit à l'analyse d'autres solutions. Ainsi, le but de cette thèse est, d'une part, d'analyser les écueils actuels qui ont conduit à l'insécurité des bénéficiaires d'autorisation d'urbanisme et, d'autre part, d'analyser la pertinence des instruments juridiques régissant le droit de l'urbanisme avec un focus particulier sur les apports de la réforme des procédures contentieuses en urbanisme de 2013. / The present dissertation is interested in the systematization of the threats of construction authorizations cancellation. This discussion examines the reality of overuses of the right of individual recourse in order to examine issues which could enhance the legal certainty of construction authorizations. The rapid growth of the overused recourses number leads to the manipulation of the law and of the judge. This transforms the courtroom in an odd market where the judge is the tool of a bad regulation. The result is significant. The reason for that is very simple: litigation is quite expensive and amicable settlements too. However, regulatory measures exist but they are not effective. The 2013 reform brought several innovative changes. Optimism leads us to believe these changes will be effective. But a more pessimistic viewpoint leads to highlight the other solutions. Hence, the purpose of this thesis work is to analyze the obstacles and limits of the existing tools which have led to insecure construction authorizations. Furthermore, it aims to analyze the relevance of existing legal instruments in urban planning law. Permis de construire Sécurisation Recours abusifs Juge administratif Contrôle de légalité Contentieux d'urbanisme Recours en excès de pouvoir Construction authorizations Legal certainty Overuse of recourses Control of legality Dispute of town planning Nullity 346.045
3	Les biens d'usage public en droit colombien / Regulation of public property available for public use in colombian law Pimiento-Echeverri, Julian-Andres 02 May 2011 (has links) Les biens d'usage public sont la catégorie centrale de la construction du droit administratif des biens. L'absence d'une analyse d'ensemble de la catégorie, en droit colombien, pousse à revoir les bases sur lesquelles elle repose et ses conséquences. Plus que toute autre catégorie juridique, les biens d'usage public sont tributaires de leur histoire, c'est dans l'étude de cette dernière que se trouvent les clés d'interprétation de tout le système. Le modèle utilisé par le code civil colombien a été calqué sur la division des biens publics, opérée par le droit espagnol colonial – inspirée à son tour du droit romain. Une mise à jour s'avère nécessaire. À partir de la notion de propriété publique, et de son régime constitutionnel, il est possible de construire une définition matérielle des biens d'usage public, permettant de comprendre les caractéristiques de l'usage public. Cela implique, aussi, une révision complète du régime juridique à la lumière de l'exploitation sociale et économique – valorisation – de la propriété publique. À une triple protection, celle de la propriété publique, du bien d'usage public et de l'usager, s'ajoute une nouvelle approche des occupations privatives. Cette idée d'exploitation sociale et économique anime un nouveau régime des titres habilitant l'occupation privative, des redevances pour occupation des biens d'usage public et des droits réels administratifs. / Regulation of public property available for public use is at the core of administrative law. The Colombian Civil Code has copied colonial Spanish law in the matter, which in turn was inspired by Roman law. However, the absence of an exhaustive and coherent regulation in Colombia has forced the interpreter to study its foundation and further developments to interpret it. An update of this legal system is, therefore, imperative. Beginning with the concept of public property and its constitutional regulation, it is poss ible to analyze the elements of its public use, which will allow proposing a definition of those assets. It is necessary to analyze the regulation of these public properties under the light of their social and economic value. The protection granted by the law to the concepts of public property, public use and public user, has to be assessed under the new approach of the administrative authorizations pertaining to such public property. This notion of social and economic value will also allow scholars/people to have a new vision of the regulation of administrative authorizations, the exclusive rights (in rem) they confer and the income they produce. Affectation Biens d'usage public Biens fiscaux Espace public Domaine éminent Domaine public Droit administratif des biens Droits collectifs Droit colombien Droit espagnol Droits fondamentaux Droit français Droits réels administratifs Espace hertzien Occupation privative Propriété publique Redevance Titres d'habilitation Valorisation Vendeurs ambulants Colombie Espagne France Administrative authorizations Administrative law Collective rights Collective Actions Colombian law French law Eminent domain In rem rights Private property Public domain Public property available for public use Public resources Exclusive rights on public property Property for public use User charges Colombia Colonies -- Spain -- Law and legislation France

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