TOWARDS A MODELLING FRAMEWORK WITH TEMPORAL AND UNCERTAIN DATA FOR ADAPTIVE SYSTEMS

Doctoral thesis (2019)

Self-Adaptive Systems (SAS) optimise their behaviours or configurations at runtime in response to a modification of their environments or their behaviours. These systems therefore need a deep ... [more ▼]

Self-Adaptive Systems (SAS) optimise their behaviours or configurations at runtime in response to a modification of their environments or their behaviours. These systems therefore need a deep understanding of the ongoing situation which enables reasoning tasks for adaptation operations. Using the model-driven engineering (MDE) methodology, one can abstract this situation. However, information concerning the system is not always known with absolute confidence. Moreover, in such systems, the monitoring frequency may differ from the delay for reconfiguration actions to have measurable effects. These characteristics come with a global challenge for software engineers: how to represent uncertain knowledge that can be efficiently queried and to represent ongoing actions in order to improve adaptation processes? To tackle this challenge, this thesis defends the need for a unified modelling framework which includes, besides all traditional elements, temporal and uncertainty as first-class concepts. Therefore, a developer will be able to abstract information related to the adaptation process, the environment as well as the system itself. Towards this vision, we present two evaluated contributions: a temporal context model and a language for uncertain data. The temporal context model allows abstracting past, ongoing and future actions with their impacts and context. The language, named Ain’tea, integrates data uncertainty as a first-class citizen. [less ▲]

Towards a multifaceted framework of complex problem solving

Scientific Conference (2018, July)

Towards a New Way of Reliable Routing: Multiple Paths over ARCs

in Towards a New Way of Reliable Routing: Multiple Paths over ARCs (2014, September 24)

The Available Routing Construct (ARC), recently proposed at IETF, provides a promising model for achieving highly reliable routing in large-scale networks. Among its features, ARC offers multi-path ... [more ▼]

The Available Routing Construct (ARC), recently proposed at IETF, provides a promising model for achieving highly reliable routing in large-scale networks. Among its features, ARC offers multi-path routing by design. In the present work, we introduced ARC for the first time to the research community. Then, we showed, by means of simulation results, how ARC over-performs classical multi-path routing algorithms, by building disjoint multiple paths without extra-cost due to new route computation. [less ▲]

Towards a non-normative understanding of cooperatives. Learning from local cooperation experiences in Kyrgyzstan

Scientific Conference (2020)

Towards a Plug-and-Play and Holistic Data Mining Framework for Understanding and Facilitating Operations in Smart Buildings

Report (2017)

Nowadays, a significant portion of the total energy consumption is attributed to the buildings sector. In order to save energy and protect the environment, energy consumption in buildings must be more ... [more ▼]

Nowadays, a significant portion of the total energy consumption is attributed to the buildings sector. In order to save energy and protect the environment, energy consumption in buildings must be more efficient. At the same time, buildings should offer the same (if not more) comfort to their occupants. Consequently, modern buildings have been equipped with various sensors and actuators and interconnected control systems to meet occupants’ requirements. Unfortunately, so far, Building Automation Systems data have not been well-exploited due to technical and cost limitations. Yet, it can be exceptionally beneficial to take full advantage of the data flowing inside buildings in order to diagnose issues, explore solutions and improve occupant-building interactions. This paper presents a plug-and-play and holistic data mining framework named PHoliData for smart buildings to collect, store, visualize and mine useful information and domain knowledge from data in smart buildings. PHoliData allows non technical experts to easily explore and understand their buildings with minimum IT support. An architecture of this framework has been introduced and a prototype has been implemented and tested against real-world settings. Discussions with industry experts have suggested the system to be extremely helpful for understanding buildings, since it can provide hints about energy efficiency improvements. Finally, extensive experiments have demonstrated the feasibility of such a framework in practice and its advantage and potential for buildings operators. [less ▲]

Towards a Proactive Learning Management System Using Early Activity Detection

in SITE08 - Society for Information Technology & Teacher Education International Conference (2008)

This report shows some findings of a study conducted on graduate level project management course using a simple Learning Management System (LMS) test-case interaction. Statistical analysis techniques were ... [more ▼]

This report shows some findings of a study conducted on graduate level project management course using a simple Learning Management System (LMS) test-case interaction. Statistical analysis techniques were used to observe if students who had more interaction in the LMS online activities and content access, were more likely to succeed in the learning experience. Furthermore, this paper describes the concepts and the methodological approach designed to study how to early trigger the LMS user’s interaction. [less ▲]

Towards a Quantitative Averaging Principle for Stochastic Differential Equations

E-print/Working paper (2017)

Towards a repertoire-building approach: multilingualism in language classes for refugees in Luxembourg

in Language and Intercultural Communication (2017), 17(4), 474-493

This contribution examines how the diverse language resources that teachers and learners bring to the classroom can support the process of language learning. It draws on a range of linguistic ethnographic ... [more ▼]

This contribution examines how the diverse language resources that teachers and learners bring to the classroom can support the process of language learning. It draws on a range of linguistic ethnographic data collected at a French language course that was attended mostly by Syrian and Iraqi refugees in Luxembourg. Drawing on the analysis of multilingual interactional practices, the article sheds light on some of the opportunities for learning that emerged as a result of translation, translanguaging and receptive multilingualism. It discusses the relevance of these practices for building a repertoire of resources that enables forced migrants to communicate in multilingual contexts such as Luxembourg. [less ▲]

Towards a Robot Perception Specification Language

in 4th International Workshop on Domain-Specific Languages and models for ROBotic systems (DSLRob-13), Tokyo, Japan, Nov. 2013 (2013, November)

Towards a seamless Integration of CAD and Simulation: CISM Course 2017

Learning material (2017)

Isogeometric analysis relies on the use of the same basis functions as employed in Computer Aided Design (CAD). This offers the possibility to facilitate design and optimisation. The previous course ... [more ▼]

Isogeometric analysis relies on the use of the same basis functions as employed in Computer Aided Design (CAD). This offers the possibility to facilitate design and optimisation. The previous course “Isogeometric methods for numerical simulation” held in 2013 had the aim to give an introduction to isogeometric analysis, its advantages, drawbacks and to the range of its applications. The aim of the proposed new course will be different. The focus will be more on the connection of simulation to CAD systems and how CAD data can be used directly for simulation, leading to a seamless integration. An overview of recent advances and applications will be also presented. The course will start with an introduction to NURBS and their use in describing geometry and in simulation. This will be followed by lectures from a CAD vendor describing the current state of development. Currently available connections to simulation software will also be discussed. Next the use of NURBS for 3D structural analysis, structural optimisation and damage tolerance assessment will be presented, including such advanced topics as the treatment of discontinuities and real-time solvers. It will also be discussed when it might be advantageous to decouple the boundary discretisation from the field variable discretisation, in particular in shape optimisation. Isogeometric methods for the analysis of beam and shell structures, including shape optimisation and fluid structure interaction, will be presented. Lectures on the mathematical and algorithmic foundations of analysis-suitable geometry will follow. This includes an introduction to T-splines and multilevel spline schemes such as hierarchical B- splines. Common analysis-suitable spline algorithms will be presented in the context of Bézier extraction and projection as well as its application as a foundation for integrated engineering design and analysis. An important aspect of analysis-suitable geometry is the ability to locally adapt the smooth spline basis. Several common refinement algorithms will be reviewed as well as their application in several demanding areas of application. The emerging area of weak geometry will be introduced as well as its application to the rapid construction of complex structural assemblies. With the rapid development of isogeometric analysis in recent years, there is an urgent need for volumetric parameterization such as volumetric T-spline model construction. Several volumetric T- spline modeling techniques, that were developed in recent years will be presented. They include converting any quad/ hex meshes to standard and rational T-splines, polycube-based parametric mapping, feature preservation using eigenfunctions, Boolean operations and skeletons, truncated hierarchical Catmull-Clark subdivision, weighted T-splines, conformal T-spline modeling, as well as incorporating T-splines into commercial CAD and FEA software, will be presented. The target audience will be engineers, interested in simulation, software developers and researchers. [less ▲]