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Search Results: 1 - 10 of 1628 matches for " Laure Pauline Fotso "
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Solving Bilevel Linear Multiobjective Programming Problems  [PDF]
Calice Olivier Pieume, Patrice Marcotte, Laure Pauline Fotso, Patrick Siarry
American Journal of Operations Research (AJOR) , 2011, DOI: 10.4236/ajor.2011.14024
Abstract: This study addresses bilevel linear multi-objective problem issues i.e the special case of bilevel linear programming problems where each decision maker has several objective functions conflicting with each other. We introduce an artificial multi-objective linear programming problem of which resolution can permit to generate the whole feasible set of the upper level decisions. Based on this result and depending if the leader can evaluate or not his preferences for his different objective functions, two approaches for obtaining Pareto- optimal solutions are presented.
Solution Concepts and New Optimality Conditions in Bilevel Multiobjective Programming  [PDF]
Francisque Fouodji Dedzo, Laure Pauline Fotso, Calice Olivier Pieume
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.330196
Abstract: In this paper, new sufficient optimality theorems for a solution of a differentiable bilevel multiobjective optimization problem (BMOP) are established. We start with a discussion on solution concepts in bilevel multiobjective programming; a theorem giving necessary and sufficient conditions for a decision vector to be called a solution of the BMOP and a proposition giving the relations between four types of solutions of a BMOP are presented and proved. Then, under the pseudoconvexity assumptions on the upper and lower level objective functions and the quasiconvexity assumptions on the constraints functions, we establish and prove two new sufficient optimality theorems for a solution of a general BMOP with coupled upper level constraints. Two corollary of these theorems, in the case where the upper and lower level objectives and constraints functions are convex are presented.
Energetic Extended Edge Finding Filtering Algorithm for Cumulative Resource Constraints  [PDF]
Roger Kameugne, Sévérine Betmbe Fetgo, Laure Pauline Fotso
American Journal of Operations Research (AJOR) , 2013, DOI: 10.4236/ajor.2013.36056
Abstract:

Edge-finding and energetic reasoning are well known filtering rules used in constraint based disjunctive and cumulative scheduling during the propagation of the resource constraint. In practice, however, edge-finding is most used (because it has a low running time complexity) than the energetic reasoning which needs O(n3 time-intervals to be considered (where n is the number of tasks). In order to reduce the number of time-intervals in the energetic reasoning, the maximum density and the minimum slack notions are used as criteria to select the time-intervals. The paper proposes a new filtering algorithm for cumulative resource constraint, and titled energetic extended edge finder of complexity O(n3. The new algorithm is a hybridization of extended edge-finding and energetic reasoning: more powerful than the extended edge-finding and faster than the energetic reasoning. It is proven that the new algorithm subsumes the extended edge-finding algorithm. Results on Resource Constrained Project Scheduling Problems (RCPSP) from BL set and PSPLib librairies are reported. These results show that in practice the new algorithm is a good trade-off between the filtering power and the running time on instances where the number of tasks is less than 30.

Generating Efficient Solutions in Bilevel Multi-Objective Programming Problems  [PDF]
Calice Olivier Pieume, Patrice Marcotte, Laure Pauline Fotso, Patrick Siarry
American Journal of Operations Research (AJOR) , 2013, DOI: 10.4236/ajor.2013.32026
Abstract:

In this paper, we address bilevel multi-objective programming problems (BMPP) in which the decision maker at each level has multiple objective functions conflicting with each other. Given a BMPP, we show how to construct two artificial multiobjective programming problems such that any point that is efficient for both the two problems is an efficient solution of the BMPP. Some necessary and sufficient conditions for which the obtained result is applicable are provided. A complete procedure of the implementation of an algorithm for generating efficient solutions for the linear case of BMPP is presented. A numerical example is provided to illustrate how the algorithm operates.

An Ontology-Based Approach for Multi-Agent Systems Engineering
Souleymane Koussoube,Armel Ayimdji,Laure Pauline Fotso
International Journal of Modern Education and Computer Science , 2013,
Abstract: This paper presents OBAMAS (Ontology-Based Approach for Multi-Agent Systems engineering), an ontology-based contribution to Agent Oriented Software Engineering. We propose a formal process for agentification, starting with an analysis phase which consists of the construction of three formal ontologies (a domain ontology, an ontology of functionalities, and an ontology of multi-agents systems) and their alignment to merge in a single one. The second step, which is a design phase, consists of the operationalization of the single ontology in order to infer in a more formal way the agents of the system. A case study is introduced to illustrate OBAMAS and to show its use and effectiveness in a real application, a distance learning system.
Towards A “Deep” Ontology for African Traditional Medicine  [PDF]
Armel Ayimdji, Souleymane Koussoubé, Laure P. Fotso, Balira O. Konfé
Intelligent Information Management (IIM) , 2011, DOI: 10.4236/iim.2011.36030
Abstract: The increasing interest on ontologies as the backbone technology for knowledge based systems implies the refinement of ontologies development methods. In this paper we propose a new approach to develop an ontology for African Traditional Medicine. The aim of our approach is to build a deep ontology by deepening concepts descriptions to formally represent all the semantics underlying the concepts used in African traditional medicine. We use a description logics language to formalize our approach.
Bursting of rigid bubbles
Pauline C. Petit,Anne-Laure Biance
Physics , 2013,
Abstract: We propose here a fluid dynamics video relating the bursting of soap rigid films.
Holes and cracks in rigid foam films
Pauline Petit,Marie Le Merrer,Anne-Laure Biance
Physics , 2015,
Abstract: The classical problem of foam film rupture dynamics has been investigated when surfaces exhibit very high rigidity due to the presence of specific surfactants. Two new features are reported. First a strong deviation to the well-known Taylor-Culick law is observed. Then, crack-like patterns can be visualized in the film; these patterns are shown to appear at a well defined deformation. The key role of surface active material on these features is quantitatively investigated, pointing the importance of surface elasticity to describe these fast dynamical processes, and thus providing an alternative tool to characterize surface elasticity in conditions extremely far from equilibrium. The origin of the cracks and their consequences on film rupturing dynamics are also discussed.
Child health inequities in developing countries: differences across urban and rural areas
Jean-Christophe Fotso
International Journal for Equity in Health , 2006, DOI: 10.1186/1475-9276-5-9
Abstract: The most recent data sets available from the Demographic and Health Surveys (DHS) of 15 countries in sub-Saharan Africa (SSA) are used. The selection criteria were set to ensure that the number of countries, their geographical spread across Western/Central and Eastern/Southern Africa, and their socioeconomic diversities, constitute a good yardstick for the region and allow us to draw some generalizations. A household wealth index is constructed in each country and area (urban, rural), and the odds ratio between its uppermost and lowermost category, derived from multilevel logistic models, is used as a measure of socioeconomic inequalities. Control variables include mother's and father's education, community socioeconomic status (SES) designed to represent the broad socio-economic ecology of the neighborhoods in which families live, and relevant mother- and child-level covariates.Across countries in SSA, though socioeconomic inequalities in stunting do exist in both urban and rural areas, they are significantly larger in urban areas. Intra-urban differences in child malnutrition are larger than overall urban-rural differentials in child malnutrition, and there seem to be no visible relationships between within-urban inequities in child health on the one hand, and urban population growth, urban malnutrition, or overall rural-urban differentials in malnutrition, on the other. Finally, maternal and father's education, community SES and other measurable covariates at the mother and child levels only explain a slight part of the within-urban differences in child malnutrition.The urban advantage in health masks enormous disparities between the poor and the non-poor in urban areas of SSA. Specific policies geared at preferentially improving the health and nutrition of the urban poor should be implemented, so that while targeting the best attainable average level of health, reducing gaps between population groups is also on target. To successfully monitor the gaps between ur
Usefulness of Natural Starters in Food Industry: The Example of Cheeses and Bread  [PDF]
Demarigny Yann, Gerber Pauline
Food and Nutrition Sciences (FNS) , 2014, DOI: 10.4236/fns.2014.517181
Abstract: Natural starters have been extensively used for many centuries to make many different fermented food products from different raw materials: Milk, meat, roots, vegetables, etc. The industrialisation of food production at the end of the 19th century necessitated the use of regular selected starters to standardize the organoleptic characteristics of the final product. As a consequence, during the 20th century, there was a decline in the use of natural starters in Western countries except in the production of local cheeses or sourdough breads. The beginning of this new millennium has witnessed a deep change in consumer demand, in pursuit of quality, safety and pleasure. In this context, natural starters could, in the future, play an important role in the development of fermented products. However, food producers and researchers have first to cope with fundamental problems in the understanding of these complex ecosystems. The dynamic evolution of the microbial population inside the natural starter (its resilience, its genetic and physiological aptitudes) and the consequences on the product are still partially unknown. This document reviews a broad range of articles concerning the use of natural starters with a specific focus on cheeses and breads, and discusses the major stakes for local food production and the consumption of typical products.
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