Search results for "ACM"
showing 10 items of 57 documents
Mikroservisa autorizēšanās sistēma balstīta uz XACML standartu
2017
Bakalaura darbā ir izpētīts XACML standarts, kas ir vecākais un populārākais no diviem atribūtu bāzētās piekļuves kontroles standartiem. Galvenais mērķis bakalaura darba izstrādē bija izstrādāt uz XACML standarta balstītu, bet ne obligāti tā implementējošu autorizēšanās sistēmu, kas ir veidota Node.js vidē TypeScript programmēšanas valodā un ir vieglāk izmantojama par esošajiem risinājumiem. Viens no veidiem, kā padarīt implementēto sistēmu vieglāk izmantojumu, bija izstrādāt jaunu, uz XML nebalstītu politiku valodu un tās apstrādes modeli. Teorētiskajā daļā ir aprakstīts XACML standarts - tā politiku valoda, darbības mehānismi un arhitektūra -, sniegts pārskats par esošajām atvērtā pirmkod…
A novel policy-driven reversible anonymisation scheme for XML-based services
2015
Author's version of an article in the journal: Information Systems. Also available from the publisher at: http://dx.doi.org/10.1016/j.is.2014.05.007 This paper proposes a reversible anonymisation scheme for XML messages that supports fine-grained enforcement of XACML-based privacy policies. Reversible anonymisation means that information in XML messages is anonymised, however the information required to reverse the anonymisation is cryptographically protected in the messages. The policy can control access down to octet ranges of individual elements or attributes in XML messages. The reversible anonymisation protocol effectively implements a multi-level privacy and security based approach, s…
Enforcing role based access control model with multimedia signatures.
2009
International audience; Recently ubiquitous technology has invaded almost every aspect of the modern life. Several application domains, have integrated ubiquitous technology to make the management of resources a dynamic task. However, the need for adequate and enforced authentication and access control models to provide safe access to sensitive information remains a critical matter to address in such environments. Many security models were proposed in the literature thus few were able to provide adaptive access decisions based on the environmental changes. In this paper, we propose an approach based on our previous work [B.A. Bouna, R. Chbeir, S. Marrara, A multimedia access control languag…
Extending SPARQL with Temporal Logic
2009
The data integration and sharing activities carried on in the framework of the Semantic Web lead to large knowledge bases that must be queried, analyzed, and exploited efficiently. Many of the knowledge representation languages of the Semantic Web, starting with RDF, are based on directed, labeled graphs, which can be also manipulated using graph algorithms and tools coming from other domains. In this paper, we propose an analysis approach of RDF graphs by reusing the verification technology developed for concurrent systems. To this purpose, we define a translation from the SPARQL query language into XTL, a general-purpose graph manipulation language implemented in the CADP verification too…
Evaluating Community Detection Algorithms: A multidimensional issue
2018
International audience; na
Smart camera design for realtime High Dynamic Range imaging
2011
International audience; Many camera sensors suffer from limited dynamic range. The result is that there is a lack of clear details in displayed images and videos. This paper describes our approach to generate high dynamic range (HDR) from an image sequence while modifying exposure times for each new frame. For this purpose, we propose an FPGA-based architecture that can produce a real-time high dynamic range video from successive image acquisition. Our hardware platform is build around a standard low dynamic range CMOS sensor and a Virtex 5 FPGA board. The CMOS sensor is a EV76C560 provided by e2v. This 1.3 Megapixel device offers novel pixel integration/readout modes and embedded image pre…
Surfaces of minimal degree of tame representation type and mutations of Cohen–Macaulay modules
2017
We provide two examples of smooth projective surfaces of tame CM type, by showing that any parameter space of isomorphism classes of indecomposable ACM bundles with fixed rank and determinant on a rational quartic scroll in projective 5-space is either a single point or a projective line. For surfaces of minimal degree and wild CM type, we classify rigid Ulrich bundles as Fibonacci extensions. For the rational normal scrolls S(2,3) and S(3,3), a complete classification of rigid ACM bundles is given in terms of the action of the braid group in three strands.
Utilisation des bras de mesure polyarticulés portables
2017
International audience; Les bras de mesure polyarticulés portables (articulated arm coordiante measuring machine : AACMM) sont des machines à mesurer tridimensionnelles portables comportant 6 ou 7 axes de rotation. Ils peuvent être utilisés actuellement avec un système de palpage à contact (statique ou dynamique) ou un scanner à nappe laser. Ils sont conçus principalement pour faire de la mesure sur site et dans différents environnements. Leurs flexibilité, facilité d’utilisation et coût moins élevé que le coût des machines à mesurer tridimensionnelles classiques, font partie des éléments phares permettant à ces dispositifs d'intégrer complétement les projets de l’usine du futur. Toutefois,…
A Use Case of Data Integration in Food Production
2018
International audience; This paper presents a use case about knowledge representation and integration of data from different domains in food science. An ontology named PO 2 DG, the Process and Observation Ontology for the production of Dairy Gels, has been designed in order to provide a shared vocabulary for domain experts. The available data have been semantically structured using PO 2 DG and are stored in an RDF repository named PO 2 DG dataset. This use case identifies some of the challenges when dealing with a multi domain representation problem, gives some hints about possible solutions and suggests some further work.
Le grand débat national, une aide pour prendre des décisions locales?
2021
The Great National Debate, decided by Emmanuel Macron at the beginning of 2019 to respond to the Yellow Vests social movement, allowed the collection of citizens’ contributions on the ecological transition via an online platform. In this article, we use the corpus constituted by these contributions to identify areas where participants are asking for the development of bicycle paths and railway facilities. For this purpose, we have created a classification model to identify contributions dealing with the theme of transportation and proposed a method for extracting patterns that reflect the contributors’ proposals. We then represented these patterns on maps, using the contributors’ postal cod…