Hydrodynamics-Biology Coupling for Algae Culture and Biofuel Production

International audienceBiofuel production from microalgae represents an acute optimization problem for industry. There is a wide range of parameters that must be taken into account in the development of this technology. Here, mathematical modelling has a vital role to play. The potential of microalgae as a source of biofuel and as a technological solution for CO2 fixation is the subject of intense academic and industrial research. Large-scale production of microalgae has potential for biofuel applications owing to the high productivity that can be attained in high-rate raceway ponds. We show, through 3D numerical simulations, that our approach is capable of discriminating between situations where the paddle wheel is rapidly moving water or slowly agitating the process. Moreover, the simulated velocity fields can provide lagrangian trajectories of the algae. The resulting light pattern to which each cell is submitted when travelling from light (surface) to dark (bottom) can then be derived. It will then be reproduced in lab experiments to study photosynthesis under realistic light patterns

Journal of Telecommunications and Information Technology

kwartalni

A Design Tool For Human-centered Intelligent Buildings

Tez (Doktora) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2011Thesis (PhD) -- İstanbul Technical University, Institute of Science and Technology, 2011“Bilgi teknolojilerinin”, “iletişim ağlarının” ve “dijital teknolojiler”’in yayılan etkisiyle kullanıcıların fiziksel, sosyal, psikolojik ve ekonomik gereksinimlerinde radikal bir değişim yaşanmaktadır. İletişim ve bilgi teknolojilerindeki bu gelişmeler sonucunda çalışma kalıpları ve organizasyonel yapılarda değişmektedir. Bu değişimler akıllı bina “sistemleri”, “servisleri” ve “malzemeleri” kullanan “teknoloji-yönelimli” Akıllı Bina tasarim ölçütlerinin ortaya çıkışı üzerinde etkili olmuştur. Fakat, kullanıcıyı ve çevreyi dışarıda bırakan, sadece teknoloji-yönelimli akıllı bina tasarım yaklaşımlarının başarılı olamadığı tespit edilmiştir. Tezde önerilen bütünleşik tasarım yaklaşiminda, değişen kullanıcı ihtiyaçlarına uyumlu, tepki verebilen ve esnek bir İnsan-merkezli akıllı bina tasarımı; pasif (çevre) ve aktif (teknoloji) tasarım ölçütleri tarafından desteklenir. İnsan-merkezli akıllı binalar için bütünleşik tasarım kriterlerini ortaya koyarken “teknoloji-yönelimli” tasarım ölçütleri ve çevre-yönelimli tasarım ölçütleri uzlaştırılarak maliyet etkinliği, verimlilik, ve insan konforu maksimize edilebilir. Bu araştırmanın ana amacı; İnsan-merkezli bir akıllı bina kavramının ana unsurları olan “kullanıcı-yönelimli”, “çevre-yönelimli” ve “teknoloji-yönelimli” tasarım ölçütlerini bütünleştirip, değişen kullanıcı ihtiyaçlarına göre öğrenebilen, uyum sağlayabilen, ve tepki verme yeteneğine sahip İnsan-merkezli bir akıllı bina tasarım aracı geliştirmektir. Araştırma çalışmaları sırasında, Akıllı bina tasarımına başlamadan önce ortak bir tasarım temeli olarak alınabilecek bütünleşik bir tasarım aracı olmadığının farkına varılmıştır. Bu nedenle, insan-merkezli akıllı binalar için bütünleşik tasarım ölçütleri yaklaşımını gösteren bazı örnek kontrol listeleri oluşturulur. Bu kontrol listelerinde; “kullanıcı-yönelimli”, “çevre-yönelimli” ve “teknoloji-yönelimli” tasarım ölcütleri, İnsan-merkezli akıllı binalarda ortak bir tasarım temeline ulaşmak için birbirleriyle ilişkilendirilmiştir.There is a radical change in physical, social, psychological and economic needs of the users in global scale by the impact of pervasive “information technologies”, “communication networks” and “digital technologies”. As a result of these developments in communication and information technologies, there are changes ongoing in working patterns and organization structures. These changes have a direct impact on the emergence of “technology-oriented” Intelligent Building (IB) design criteria consisting of building “systems”, “services” and “materials”. But it is realized that “technology-oriented” IB design approaches that are precluding the user and the environment can not be successful. In the proposed integrated design approach, Human-centered IB design which is adaptive, responsive and flexible to cope with changing “user needs” are supported by passive (environment) and active (technology) design criteria. While formulating the integrated design criteria for Human-centered IBs, technology and environment-oriented design parameters can be reconciled to maximize the cost effectiveness, work productivity, and human comfort. Main goal of this research study is to integrate the major components of a Human-centered IB design which are; “user”, “environment” and “technology” oriented design criteria to develop a design tool for Human-centered IBs which has learning, adaptive, responsive skills to cope with changing user requirements. During the research studies, it is also realized that there is no integrated design tool to be taken as a common design basis before starting the design of IBs. For this reason, the author creates some sample checklists displaying the integrated design criteria approach for Human-centered IBs. In these checklists, different parameters belonging to “user”, “environment”, and “technology” oriented design criteria are correlated for reaching a common design basis for Human-centered IBs.DoktoraPh

Architecture FPGA améliorée et flot de conception pour une reconfiguration matérielle en ligne efficace

The self-reconfiguration capabilities of modern FPGA architectures pave the way for dynamic applications able to adapt to transient events. The CAD flows of modern architectures are nowadays mature but limited by the constraints induced by the complexity of FPGA circuits. In this thesis, multiple contributions are developed to propose an FPGA architecture supporting the dynamic placement of hardware tasks. First, an intermediate representation of these tasks configuration data, independent from their final position, is presented. This representation allows to compress the task data up to 11x with regard to its conventional raw counterpart. An accompanying CAD flow, based on state-of-the-art tools, is proposed to generate relocatable tasks from a high-level description. Then, the online behavior of this mechanism is studied. Two algorithms allowing to decode and create in real-time the conventional bit-stream are described. In addition, an enhancement of the FPGA interconnection network is proposedto increase the placement flexibility of heterogeneous tasks, at the cost of a 10% increase in average of the critical path delay. Eventually, a configurable substitute to the configuration memory found in FPGAs is studied to ease their partial reconfiguration.Les capacités d'auto-reconfiguration des architectures FPGA modernes ouvrent la voie à des applications dynamiques capables d'adapter leur fonctionnement pour répondre à des évènements ponctuels. Les flots de reconfiguration des architectures commerciales sont aujourd'hui aboutis mais limités par des contraintes inhérentes à la complexité de ces circuits. Dans cette thèse, plusieurs contributions sont avancées afin de proposer une architecture FPGA reconfigurable permettant le placement dynamique de tâches matérielles. Dans un premier temps, une représentation intermédiaire des données de configuration de ces tâches, indépendante de leur positionnement final, est présentée. Cette représentation permet notamment d'atteindre des taux de compression allant jusqu'à 11x par rapport à la représentation brute d'une tâche. Un flot de conception basé sur des outils de l'état de l'art accompagne cette représentation et génère des tâches relogeables à partir d'une description haut-niveau. Ensuite, le comportement en ligne de ce mécanisme est étudié. Deux algorithmes permettant le décodage de ces tâches et la génération en temps-réel des données de configuration propres à l'architectures son décrits. Par ailleurs, une amélioration du réseau d'interconnexion d'une architecture FPGA est proposée pour accroître la flexibilité du placement de tâches hétérogènes, avec une augmentation de 10% en moyenne du délai du chemin critique. Enfin, une alternative programmable aux mémoires de configuration de ces circuits est étudiée pour faciliter leur reconfiguration partielle

13th International Conference on Modeling, Optimization and Simulation - MOSIM 2020

Comité d’organisation: Université Internationale d’Agadir – Agadir (Maroc) Laboratoire Conception Fabrication Commande – Metz (France)Session RS-1 “Simulation et Optimisation” / “Simulation and Optimization” Session RS-2 “Planification des Besoins Matières Pilotée par la Demande” / ”Demand-Driven Material Requirements Planning” Session RS-3 “Ingénierie de Systèmes Basées sur les Modèles” / “Model-Based System Engineering” Session RS-4 “Recherche Opérationnelle en Gestion de Production” / "Operations Research in Production Management" Session RS-5 "Planification des Matières et des Ressources / Planification de la Production” / “Material and Resource Planning / Production Planning" Session RS-6 “Maintenance Industrielle” / “Industrial Maintenance” Session RS-7 "Etudes de Cas Industriels” / “Industrial Case Studies" Session RS-8 "Données de Masse / Analyse de Données” / “Big Data / Data Analytics" Session RS-9 "Gestion des Systèmes de Transport” / “Transportation System Management" Session RS-10 "Economie Circulaire / Développement Durable" / "Circular Economie / Sustainable Development" Session RS-11 "Conception et Gestion des Chaînes Logistiques” / “Supply Chain Design and Management" Session SP-1 “Intelligence Artificielle & Analyse de Données pour la Production 4.0” / “Artificial Intelligence & Data Analytics in Manufacturing 4.0” Session SP-2 “Gestion des Risques en Logistique” / “Risk Management in Logistics” Session SP-3 “Gestion des Risques et Evaluation de Performance” / “Risk Management and Performance Assessment” Session SP-4 "Indicateurs Clés de Performance 4.0 et Dynamique de Prise de Décision” / ”4.0 Key Performance Indicators and Decision-Making Dynamics" Session SP-5 "Logistique Maritime” / “Marine Logistics" Session SP-6 “Territoire et Logistique : Un Système Complexe” / “Territory and Logistics: A Complex System” Session SP-7 "Nouvelles Avancées et Applications de la Logique Floue en Production Durable et en Logistique” / “Recent Advances and Fuzzy-Logic Applications in Sustainable Manufacturing and Logistics" Session SP-8 “Gestion des Soins de Santé” / ”Health Care Management” Session SP-9 “Ingénierie Organisationnelle et Gestion de la Continuité de Service des Systèmes de Santé dans l’Ere de la Transformation Numérique de la Société” / “Organizational Engineering and Management of Business Continuity of Healthcare Systems in the Era of Numerical Society Transformation” Session SP-10 “Planification et Commande de la Production pour l’Industrie 4.0” / “Production Planning and Control for Industry 4.0” Session SP-11 “Optimisation des Systèmes de Production dans le Contexte 4.0 Utilisant l’Amélioration Continue” / “Production System Optimization in 4.0 Context Using Continuous Improvement” Session SP-12 “Défis pour la Conception des Systèmes de Production Cyber-Physiques” / “Challenges for the Design of Cyber Physical Production Systems” Session SP-13 “Production Avisée et Développement Durable” / “Smart Manufacturing and Sustainable Development” Session SP-14 “L’Humain dans l’Usine du Futur” / “Human in the Factory of the Future” Session SP-15 “Ordonnancement et Prévision de Chaînes Logistiques Résilientes” / “Scheduling and Forecasting for Resilient Supply Chains