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2011Zahra Kodia, Lamjed Ben Said,
Simulation comportementale à base d’agents de la dynamique du marché boursier: Modèle cognitif de l’investisseur
Revue d'intelligence artificielle, 25(1), 83-107., 2011
Abstract
This paper explores the dynamics of stock market from a behavioral perspective using
a multi-agent simulation. The aim of this paper is to study the behavior of investors in the stock
market to find a model as close as possible to reality. The main problem is to understand,
through a novel model which includes behavioral and cognitive attitudes of the investor, the
running of the market and determine the sources of his complexity. Simulation experiments are
being performed to observe stylized facts of the financial time series. These experiments show
that representing a behavioral model allows to observe emergent socio-economic phenomena. -
2010, ,
PECoDiM: An Agent Based Framework for Autonomic Web Services
World Congress on Services, 2010
Abstract
Autonomic computing is about systems that can manage themselves. Self-management includes self-configuration, self-healing, self-optimization, etc. (self-* properties). Agent technology offers key advantages for the development of autonomic computing systems as it supports autonomy, adaptability, etc. Current Web service standards and technologies don’t provide a suitable architecture in which all aspects of self-management can be designed. In this paper, we present an agent-based framework for autonomic Web services. This framework is based on a multi-agent system made up with five agents namely a Planning agent, an Execution agent, a Composition agent, a Discovery agent, and a Monitoring agent.
, Haithem Mezni,An Autonomic Computing Architecture for Self-* Web Services
Autonomic Computing and Communications Systems, 2010
Abstract
Adaptation in Web services has gained a significant attention and becomes a key feature of Web services. Indeed, in a dynamic environment such as the Web, it’s imperative to design an effective system which can continuously adapt itself to the changes (service failure, changing of QoS offering, etc.). However, current Web service standards and technologies don’t provide a suitable architecture in which all aspects of self-adaptability can be designed. Moreover, Web Services lack ability to adapt to the changing environment without human intervention. In this paper, we propose an autonomic computing approach for Web services’ self-adaptation. More precisely, Web services are considered as autonomic systems, that is, systems that have self-* properties. An agent-based approach is also proposed to deal with the achievement of Web services self-adaptation.
Wassim Ayadi, ,Iterated Local Search for Biclustering of Microarray Data
Pattern Recognition in Bioinformatics. PRIB 2010. Lecture Notes in Computer Science, vol 6282, pp 219–229, 2010
Abstract
In the context of microarray data analysis, biclustering aims to identify simultaneously a group of genes that are highly correlated across a group of experimental conditions. This paper presents a Biclustering Iterative Local Search (BILS) algorithm to the problem of biclustering of microarray data. The proposed algorithm is highlighted by the use of some original features including a new evaluation function, a dedicated neighborhood relation and a tailored perturbation strategy. The BILS algorithm is assessed on the well-known yeast cell-cycle dataset and compared with two most popular algorithms.
, Lamjed Ben Said, , ,Toward a Privacy Enhancing Framework in E-government.
In : CAiSE Forum. 2010., 2010
Abstract
E-government involves data sharing between different partners such
as citizens and government agencies. Thus, the use of personal data in such
cooperative environment must be done in legal ways and for legal purposes. In
this context, issues related to data protection, such as privacy, have to be
considered. This paper adopts a multi-agent based approach to manage privacy
concerns in e-government systems. The proposed model provides a mechanism
for e-government systems to evaluate trust degree reached by digital
government processes. For this purpose, concepts of responsibility proposed in
multi-agent systems and access rights used in security models, are integrated in
this work. The research provides an evaluative framework for trust degree
related to e-government process.Mohamed Hmiden, Lamjed Ben Said,A two-step transshipment model with fuzzy demands and service level constraints
International journal of simulation modelling, 9(1), 40-52., 2010
Abstract
We consider a distribution network composed of one supplier and several non-identical locations characterized by fuzzy customer demands and service level constraints. These locations could cooperate together via product transfer known as transshipment. The transshipment problem consists in determining the replenishment quantities that minimize the total inventory cost where a specific transfer policy is practiced. Our objectives in this paper are to identify an inter-location transfer policy that participates to satisfy the service level constraints and to determine the approximate replenishment quantities. To achieve these objectives we propose:(1) a new transshipment model based on the chance constrained programming,(2) a two-step transshipment policy that differs from classic ones by product transfer from locations in need to others also in need and (3) a hybrid algorithm based on fuzzy simulation and genetic algorithms to approximate replenishment quantities.
, Lamjed Ben Said,ABC: A new Privacy Enhancing Model for eGovernment
In ECEG2010-Proceedings of the 10th European Conference on E-Government: National Center for Taxation Studies University of Limerick, Ireland 17-18 June 2010 (p. 207). Academic Conferences Limited., 2010
Abstract
The use of eGovernment systems requires the collection of a big amount of personal data of citizens in every transaction. In such context, issues related to privacy, such as data collection and disclosure of personal information without any predefined purpose, have to be considered. In this paper, we propose a new multi-agent based model, called ABC, and used to handle privacy issues in eGovernment. The proposed model offers the possibility to statistically assess trust degree for a given eGovernment process. Also, a case study is used to simulate and to illustrate the applicability of the proposed model.
, Lamjed Ben Said, ,Multi-agent based simulation of animal food selective behavior in a pastoral system
In: Jędrzejowicz, P., Nguyen, N.T., Howlet, R.J., Jain, L.C. (eds) Agent and Multi-Agent Systems: Technologies and Applications. KES-AMSTA 2010. Lecture Notes in Computer Science(), vol 6070. Springer, Berlin, Heidelberg., 2010
Abstract
Pastoral systems are considered as complex systems, given the number of entities and the multitude of interactions and levels of granularity. To conduct a study of such system taking into account the interactions and their results, analytical approaches are not adequate. In this paper, we present an agent-based model of the animal behavior in the pastoral system taking into account the selective food aspect. This model has been validated using a multi-agent based simulation implemented on the simulation platform Cormas. The obtained results reflect the importance of this aspect in the animal behavior and its effects on vegetation cover.
Meriam Jemel, Nadia Ben Azzouna,Towards a dynamic access control model for e-government web services
In Proceedings of the 2010 IEEE Asia-Pacific Services Computing Conference (APSCC'10), December 6-10 2010, Hangzhou, China, pages 433-440, IEEE Computer Society, 2010
Abstract
The need of interoperable e-government services is addressed through the use of web services where sensitive services need to be granted to only authorized subjects from different organizations. In this paper, we propose a Trust and Dynamic Role Based Access Control model (TDRBAC) which deals with the specific requirements of e-government services. It effectively enhances the access control level since it is based on the trust level notion. The trust level evaluation is based on contextual attributes to assign to user role the appropriate view during the active session. The TDRBAC model is sensitive to the internal or external arisen events and it incorporates them in the access decision which makes it suitable for e-government dynamic environment.
Kalthoum RezguiHow to Support Disabled and Non-disabled Learners with the ACCLIP Information Model
-, 2010
Abstract
Although the extent and the nature of difficulties in learning are more severe for disabled students, non-disabled students may also have similar requirements and want to give them the ability to express preferences about display, control and content. In this paper, we propose using the IMS Accessibility for LIP (ACCLIP) specification to express accessibility preferences and needs of learners. This specification allows describing accessibility needs other than those just for learners with physical disabilities to ensure that all learners can define preferences.
