Retour au site du LAAS-CNRS

Laboratoire d’analyse et d’architecture des systèmes

Publications de l'équipe ISI

Choisir la langue : FR | EN

361documents trouvés

18137
28/06/2018

New model transformations for the stability analysis of time-delay systems

M.SAFI, L.BAUDOUIN, A.SEURET

ISI, MAC

Manifestation avec acte : IFAC Workshop on Time Delay Systems ( TDS ) 2018 du 28 juin au 30 juin 2018, Budapest (Hongrie), Juin 2018, 6p. , N° 18137

Lien : https://hal.laas.fr/hal-01799394

Diffusable

Plus d'informations

Abstract

This paper deals with the stability analysis of time delay systems based on continuous-time approach. The originality of the present paper relies on the construction of several models for a same time-delay systems using the interconnection of an ordinary differential equation and a transport partial differential equation. The stability analysis is then performed using a Lyapunov functional. These models are constructed in order to first reduce potentially the complexity of the resulting stability conditions. Second several models are build in order to be interpreted as a discretization scheme as the one usually used in the Lyapunov functional. The proposed result can be seen as a generalized (N − M) discretization which consists in both a time-discretization of the delay interval into M sub-intervals, and the projection of the state function within each sub-interval on the Legendre polynomials of degree less than N. The efficiency of this novel approach is illustrated on an academic example.

143735
18140
12/06/2018

Lyapunov stability analysis of a system coupled to a hyperbolic PDE with potential

M.SAFI, A.SEURET, L.BAUDOUIN

ISI, MAC

Manifestation avec acte : European Control Conference ( ECC ) 2018 du 12 juin au 15 juin 2018, Limassol (Chypre), Juin 2018, 6p. , N° 18140

Lien : https://hal.laas.fr/hal-01799391

Diffusable

Plus d'informations

Abstract

This work deals with a stability problem for a system coupling an ordinary differential equation to a linear vectorial hyperbolic transport equation with a potential term. Using the Lyapunov methodology , a novel approach for stability of the coupled ODE-PDE system is developed. This methodology leads to a linear matrix inequality criteria while exploiting Bessel inequality and Legendre polynomials. To demonstrate the efficiency of this technique, the obtained criteria are applied on academic example.

143743
18062
29/04/2018

Simulation distribuée hétérogène de réseaux de Petri DEVS

C.FOUCHER, V.ALBERT

ISI

Manifestation avec acte : Les journées DEVS francophones ( JDF ) 2018 du 29 avril au 05 mai 2018, Cargèse (France), Avril 2018 , N° 18062

Lien : https://hal.laas.fr/hal-01726195

Diffusable

142831
18079
13/02/2018

Improving performance measurement of engineering projects: methods to develop indicators

L.ZHENG

ISI

Doctorat : INSA de Toulouse, 13 Février 2018, 135p., Président: E.BONJOUR, Rapporteurs: C.MERLO, B.ROSE, Examinateurs: M.ZOLGHADRI, Directeurs de thèse: C.BARON, P.ESTEBAN , N° 18079

Diffusable

Plus d'informations

Résumé

La mesure de la performance est l’une des nombreuses activités de la gestion de projet, elle contribue à assurer le succès du projet. Pour atteindre ce but, les entreprises ont besoin de déterminer un système de mesures de la performance. Ces mesures fournissent au chef de projet l’état de santé du projet et l’aide à évaluer s’il a atteint ou va atteindre ses objectifs. Néanmoins, avec la complexité croissante des projets et la nécessité économique absolue d’atteindre les objectifs, les chefs de projets ne peuvent plus se contenter de superviser les coûts et le planning pour évaluer la performance du projet. Ils ont besoin de considérer par exemple d’autres indicateurs comme la satisfaction des exigences du client, la maturité de la technologie, etc. De plus, ils ont besoin d’avoir une évaluation précise des valeurs de ces indicateurs tout au long du projet et pas uniquement à la fin, pour monitorer au mieux le projet afin qu’il atteigne ses objectifs. Pour satisfaire ces nouveaux besoins, les objectifs de cette thèse sont d’étendre le nombre d’indicateurs génériques et de diversifier le type des indicateurs, ainsi que de proposer une méthode pour concevoir des indicateurs spécifiques à un projet. Pour cela, nous procédons par l’intégration de bonnes pratiques pour la mesure de performance issues de plusieurs domaines de l’ingénierie, et illustrons nos propositions sur des cas pratiques. Ce rapport introduit la notion de performance et caractérise les systèmes de mesure de performance, en mettant notamment en évidence un emploi non cohérent de la terminologie selon les sources. Il identifie plusieurs limitations des systèmes de mesure de performance actuels et souligne notamment le besoin d’étendre le nombre et le type des indicateurs, et de construire des indicateurs de performance spécifiques et pertinents pour chaque projet. Une étude bibliographique sur la mesure de la performance dans les domaines de l’ingénierie, notamment en ingénierie système, montre que la mesure de performance est particulièrement bien développée dans cette dernière discipline, avec une offre de 18 indicateurs génériques avancés permettant une grande proactivité. La thèse propose de ce fait d’adapter ces indicateurs au management de projets, résultant en la définition d’un ensemble d’indicateurs étendu et diversifié pour la mesure de performance. Par ailleurs, l’étude des normes et guides en ingénierie système et logicielle (Practical Software and System Measurement, ISO/IEC 15939) nous amène à identifier d’autres besoins, comme la création dynamique d’indicateurs ad hoc qu’il est nécessaire de définir en cours de projet afin évaluer certains risques spécifiques, et soulève de nouvelles difficultés, comme la collecte et la manipulation des données pour la construction des indicateurs. Pour y répondre, ce rapport propose donc également une méthode guidant la construction dynamique d’indicateurs spécifiques. Celle-ci, illustrée dans le mémoire sur un cas concret de projet, a été validée par un panel d’experts.

Abstract

Performance measurement is essential to ensure the success of a project. To this goal, companies need to determine a system of performance measures, classically including cost and schedule measures, which provide the project manager with the project health status and help her or him to evaluate the project successes and failures. However, with the increasing complexity of projects and the absolute necessity to reach the project objectives, project managers cannot only rely on such information about cost and schedule to evaluate the project performance; they need to consider, for instance, other indicators such as the satisfaction of customer requirements, the technology maturity, etc. Moreover, they need to have a precise evaluation of these indicators values while the project is in progress, in order to monitor it at best so that it reaches its goals, and not only after the project ends, to only conclude on the project success or failure without any mean to react. Considering these two issues, the objectives of the thesis thus are to extend the number, scope and type of current project performance indicators with a proposal of complementary indicators, and to propose a method for designing project-specific indicators, in order to improve project performance measurement. To define supplementary indicators and elaborate such a method, we proceed by integrating good measurement practices from different engineering disciplines and illustrate our proposal on use cases. The thesis first introduces the notion of performance and characterizes performance measurement systems (PMSs); such systems offer a wide panel of models for organizational performance measurement. Focusing on PMSs, we provide some insights for project performance measurement. More precisely, we identify several issues highlighted in literature, relative to the limitations of current project performance measurement such as the need to balance lagging indicators (to control) with leading indicators (to monitor), and the need to construct performance indicators that are relevant to project-specific information needs. We then focus on project performance measurement and reviews literature in this domain. It highlights the issue of the unbalanced use of leading and lagging indicators. To bring a solution to the issue, we review literature of performance measurement in engineering disciplines, with a focus on systems engineering practices, especially a panel of 18 generic leading indicators that are currently engineered in guidance. A method has been proposed to adapt the set of systems engineering leading indicators to project management, thus resulting in developing the set of indicators to measure project performance. Moreover, focusing on standards and guides on measurement in systems and software engineering led us to identify other issues in project performance measurement, such as the difficulties to define indicators dynamically for a project, and how to collect and combine data in order to construct these indicators. We finally consider the methodological difficulties about designing relevant performance indicators. More precisely, we identify 3 issues: different opinions among researchers about the sources from where the indicators will be derived; the problem in relation to the transformation from data to indicators; and the association of data collection, analysis and report with project management processes. To solve these issues, we analyze good practices from the Practical Software and Systems Measurement, the ISO/IEC 15939 norm and the Project Management Body of Knowledge that proved to be able to address the identified issues respectively. This work results in a method integrating these practices to address the 3 identified issues in project performance measurement. The method is illustrated on a real project context. Evaluation of the method has been conducted in workshop of project managers, which confirmed the interest for the proposal.

Mots-Clés / Keywords
Engineering project; Software and system measurement; Project performance measurement; Systems engineering measurement; Leading and lagging indicators; Design of indicators;

143036
18019
02/02/2018

Software Quality Assurance Dashboard for Renault Software Robustness plan with SQUORE tool

V.RUSSO, A.ORIOU, F.HUYNH, C.BARON

RENAULT Technocentre, SQUORING, ISI

Manifestation avec acte : Embedded Real Time Software and Systems ( ERTS² ) 2018 du 31 janvier au 02 février 2018, Toulouse (France), Février 2018, 6p. , N° 18019

Lien : https://hal.archives-ouvertes.fr/hal-01708596

Diffusable

Plus d'informations

Abstract

Software is becoming one of the main challenge of the vehicle development process. To boost the Renault/Nissan embedded software transformation, a Software Robustness Breakthrough Plan was launched from 2015, with 6 levers of actions. Lever n°5 addresses Software Quality Assurance (SW QA). One of the main action of this lever is to gather and calculate the SW QA key performance indicators (KPI) within the Software Qualimetry project (SOQUAL). SOQUAL mission is to provide a software quality dashboard with relevant indicators. It includes source code and model analysis and other software metrics. SW QA KPI calculation was chosen as a use case to test a Qualimetry tool and to optimize the workload and the cost of Quality assurance activities. SQUORE [1] tool was selected for a quick development applied on one vehicle project (Start of production 2019). Renault has yet enlarging project scope: SW QA SQUORE tool is being deployed on several vehicle projects. Renault is also writing the specification to select a tool to implement a full Quality model: all software metrics (cost, model, code, schedule, anomalies, SW QA KPI…) should be gathered and aggregated to give the health status of software at vehicle project level, ECU level, function level..

142393
16121
01/01/2018

A software requirement engineering framework to enhance critical success factor for ERP implementation

N.OSMAN, A.E.K.SAHRAOUI

SUST, ISI

Revue Scientifique : International Journal of Computer Applications, Vol.180, N°10, pp.32-37, Janvier 2018 , N° 16121

Lien : https://hal.laas.fr/hal-01704403

Diffusable

Plus d'informations

Abstract

Requirement it's most critical success or failure factor for system. Enterprise Resource Planning (ERP) one of famous enterprise system and many studies focus on define CSF of it to reduce failing cases of ERP implementation and negative factors affecting not only on implementing company but also on the ERP vendors. Many papers have studied the CSF influence in ERP implementation but very little concern about requirement engineering (RE). This research will fill the gap by providing critical review and develop an approach in software system engineering framework by taking account feedback from stakeholders. This original approach is how to deal with ERP failure through a depth relation related to requirement engineering traceability to CSF in a system engineering view (SOS) based on ANSI EIA 632 standard.

142622
18041
01/01/2018

From PLM to ERP : A software systems engineering integration

N.OSMAN, A.E.K.SAHRAOUI

SUST, ISI

Revue Scientifique : International journal of software engineering and applications, Vol.9, N°1, pp.11-27, Janvier 2018 , N° 18041

Lien : https://hal.laas.fr/hal-01704409

Diffusable

Plus d'informations

Abstract

The present paper on three related issues and their integration Product lifecycle management , Enterprise Planning resources and Manufacturing execution systems. Our work is how to integrate all these in a unified systems engineering framework. As most company about two third claim to have integrate ERP to PLM, ; we still observe some related problems as also mentioned by Aberdeen group. In actual global data sharing, we have some options to also integrate systems best practices towards such objective. Such critical study come with solution by reverse engineering, revisiting requirement engineering steps and propose a validation and verification for the success factors of such integration

142673
16231
01/12/2017

Tractable sufficient stability conditions for a system coupling linear transport and differential equations

M.SAFI, L.BAUDOUIN, A.SEURET

ISI, MAC

Revue Scientifique : Systems & Control Letters, Vol.110, pp.1-8, Décembre 2017 , N° 16231

Lien : https://hal.archives-ouvertes.fr/hal-01354073

Diffusable

Plus d'informations

Abstract

This paper deals with the stability analysis of a system of ordinary differential equations coupled to a vectorial transport equation. We develop here a new method to study the stability of this class of systems using linear matrix inequalities led by the choice of an appropriate Lyapunov functional. The main idea in our approach is to build a Lyapunov functional by enriching the basic energy of the coupled system under study with specific terms involving an approximation of the infinite dimensional state of the transport equation. To this end, we will exploit Legendre polynomials and their properties, and use a Bessel inequality to measure the contribution of our approximation. We will then give our exponential stability results and their proofs. Our approach will finally be tested on academic examples.

143112
17576
01/12/2017

A framework to improve performance measurement in engineering projects

L.ZHENG, C.BARON, P.ESTEBAN, R.XUE, Q.ZHANG

ISI, UPMC

Revue Scientifique : Insight, Vol.20, N°4, pp.40-43, Décembre 2017 , N° 17576

Lien : https://hal.archives-ouvertes.fr/hal-01709535

Diffusable

Plus d'informations

Abstract

A wide range of methods and good practices have been developed for the measurement of projects performance. They help project managers to effectively monitor the project progress and evaluate results. However, from a literature review, we noticed several remaining critical issues in measuring projects performance, such as an unbalanced development of Key Performance Indicators types between lagging and leading indicators. On the other hand, systems engineering measurement is a more recent discipline with practices and theories that appeared with the emergence of the systems engineering discipline; however, this discipline offers very deep developments, published in several standards and guides. In particular, systems engineering measurement does not only manipulate lagging indicators, useful to track how things are going, but defines methods to promote leading indicators, used as precursors to the direction the engineering is going. Indeed, 18 leading indicators were recently proposed, validated, and finally engineered in a practical guidance. The objective of this paper being to improve project performance and success rate, one mean is to improve the measurement of projects performance by enriching its leading indicators, on which decisions rely on project management. To reach this goal, we propose to refine and extend the performance measurement activities in the Project Management Body of Knowledge (PMBoK version 5) by considering systems engineering measurement. This paper thus considers transferring and adapting the good practices in systems engineering measurement such as described in systems engineering guides as well as the set of systems engineering leading indicators to the well-defined project management processes in PMBoK. To this effect, we propose a methodology resulting in a framework to explore this integration. This way, systems engineering leading indicators can be applied to project performance measurement, thus providing project managers with a wider set of leading indicators and straightforward measurement techniques.

142668
17426
27/10/2017

Applying the model-driven architecture approach to dynamic structure applications

M.ZHU, C.FOUCHER, V.ALBERT, A.NKETSA

ISI

Manifestation avec acte : European Simulation and Modelling Conference ( ESM ) 2017 du 25 octobre au 27 octobre 2017, Lisbonne (Portugal), Octobre 2017, 8p. , N° 17426

Lien : https://hal.laas.fr/hal-01635791

Diffusable

Plus d'informations

Abstract

Model-Driven Architecture (MDA) is a system engineering approach which consists in separating the model description from the execution platform. It allows building a model without detailed knowledge of the target platform, as well as retargeting the execution platform without changing the model itself. We present a meta-model called Partial Reconfigurable DEVS (PRDEVS) that is able to represent dynamic structure changes of a model. We base our approach on the DEVS formalism, which is modular and hierarchical. Our description paradigm differs from the previous DEVS-based dynamic meta-models in that it explicitly deals with adding and removing components. This approach is closer to the general reconfigurable embedded system design methodology. Both a software and a FPGA-based hardware platform are considered as dynamic execution platforms.

141677
Les informations recueillies font l’objet d’un traitement informatique destiné à des statistiques d'utilisation du formulaire de recherche dans la base de données des publications scientifiques. Les destinataires des données sont : le service de documentation du LAAS.Conformément à la loi « informatique et libertés » du 6 janvier 1978 modifiée en 2004, vous bénéficiez d’un droit d’accès et de rectification aux informations qui vous concernent, que vous pouvez exercer en vous adressant à
Pour recevoir une copie des documents, contacter doc@laas.fr en mentionnant le n° de rapport LAAS et votre adresse postale. Signalez tout problème de dysfonctionnement à sysadmin@laas.fr. http://www.laas.fr/pulman/pulman-isens/web/app.php/