Dissertationen zum Thema „Algorithme du Consensus“
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Lavault, Christian. „Algorithmique et complexité distribuées : applications à quelques problèmes fondamentaux de complexité, protocoles distribués à consensus, information globale, problèmes distribués d'élection et de routage“. Paris 11, 1987. http://www.theses.fr/1987PA112392.
Der volle Inhalt der QuelleHanna, Fouad. „Etude et développement du nouvel algorithme distribué de consensus FLC permfettant de maintenir la cohérence des données partagées et tolérant aux fautess“. Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2051.
Der volle Inhalt der QuelleNowadays, collaborative work took a very important place in many fields and particularly in the medicaltelediagnosis field. The consistency of shared data is a key issue in this type of applications. Moreover, itis essential to use a consensus algorithm to ensure data consistency in collaborative platforms. We presenthere our new consensus algorithm FLC that helps to ensure data consistency in asynchronous collaborativedistributed systems. Our algorithm is fault tolerant and aims to improve the performance of consensus ingeneral and particularly in the case of process crashes. The new algorithm uses the leader oracle tocircumvent the impossibility result of the FLP theorem. It is decentralized and considers the crash-stop failuremodel. The FLC algorithm is based on two main ideas. The first is to perform, at the beginning of eachround, a simple election phase guaranteeing the existence of only one leader per round. The second is totake advantage of system stability and more particularly of the fact that the leader does not crash betweentwo consecutive consensus runs. The performance of our algorithm was analyzed and compared to the mostknown algorithms in the domain. The results obtained by simulation, using the Neko platform, demonstratedthat our algorithm gave the best performance when using a multicast network in the best case scenario and insituations where the algorithm undergoes one or more crashes of coordinators/leaders processes
Ouattara, Mory. „Développement et mise en place d'une méthode de classification multi-blocs : application aux données de l'OQAI“. Phd thesis, Conservatoire national des arts et metiers - CNAM, 2014. http://tel.archives-ouvertes.fr/tel-01062782.
Der volle Inhalt der QuelleKyrgyzov, Ivan. „Recherche dans les bases de donnees satellitaires des paysages et application au milieu urbain: clustering, consensus et categorisation“. Phd thesis, Télécom ParisTech, 2008. http://pastel.archives-ouvertes.fr/pastel-00004084.
Der volle Inhalt der QuelleBelkadi, Adel. „Conception de commande tolérante aux défauts pour les systèmes multi-agents : application au vol en formation d'une flotte de véhicules autonomes aériens“. Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0183/document.
Der volle Inhalt der QuelleIn recent years, the emergence of new technologies such as miniaturization of components, wireless communication devices, increased storage size and computing capabilities have allowed the design of increasingly complex cooperative multi-agent systems. One of the main research axes in this topic concerns the formation control of fleets of autonomous vehicles. Many applications and missions, civilian and military, such as exploration, surveillance, and maintenance, were developed and carried out in various environments. During the execution of these tasks, the vehicles must interact with their environment and among themselves to coordinate. The available communication tools are often limited in scope. The preservation of the connection within the group then becomes one of the objectives to be satisfied in order to carry out the task successfully. One of the possibilities to guarantee this constraint is the training displacement, which makes it possible to preserve the distances and the geometrical structure of the group. However, it is necessary to have tools and methods for analyzing and controlling these types of systems in order to make the most of their potential. This thesis is part of this research direction by presenting a synthesis and analysis of multi-agent dynamical systems and more particularly the formation control of autonomous vehicles. The control laws developed in the literature for formation control allow to carry out a large number of missions with a high level of performance. However, if a fault/failure occurs in the training, these control laws can be very limited, resulting in unstable system behavior. The development of fault tolerant controls becomes paramount to maintaining control performance in the presence of faults. This problem will be dealt with in more detail in this thesis and will concern the development and design of Fault tolerant controls devolved to a fleet of autonomous vehicles according to different configuration/structuring
Ouattara, Mory. „Développement et mise en place d'une méthode de classification multi-blocs : application aux données de l'OQAI“. Electronic Thesis or Diss., Paris, CNAM, 2014. http://www.theses.fr/2014CNAM0914.
Der volle Inhalt der QuelleThe multiplication of information source and the development of news technologies generates complex databases, often characterized by relatively high number of variables compared to individuals. In particular, in the environmental studies on the indoor air quality, the information's collection is done according to several thematic, yielding column partitioned or multi-block data set. However, in case of high dimensional data, classical clustering algorithms are not efficient to find clusters which may exist in subspaces of the original space. The goal of this work is to develop clustering algorithms adapted to high dimensional data sets with multi-block structure. The first part of the work shows the state of art on clustering methods. In the second part, three new methods of clustering: the subspace clustering method 2S-SOM (Soft Subspace-Self Organizing Map)is based on a modified cost function of the Self Organizing Maps method across a double system of weights on the blocks and the variables. Then we propose two approaches to find the consensus of self-organized maps CSOM (Consensus SOM) and Rv-CSOM based on weights determined from initial partitions. The last part presents an application of these methods on the OQAI data to determine a typology of dwellings relatively to the following topics: indoor air quality, dwellings structure, household characteristics and habits of the inhabitants
van, de Hoef Sebastian. „Extended Consensus Algorithms“. Thesis, KTH, Reglerteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-125809.
Der volle Inhalt der QuelleDANCKAERT, PERRUCHOT ANNE. „Traitement informatique des autoradiographies de gels de sequences : conception et mise en oeuvre d'un systeme automatique d'interpretation d'autoradiographies, elaboration d'un algorithme de construction de la sequence consensus a partir de fragments“. Paris 7, 1988. http://www.theses.fr/1988PA077045.
Der volle Inhalt der QuelleCórdova, Morales David Alexis. „Blockchain Application for Mesh and Mobile Ad Hoc Networks“. Electronic Thesis or Diss., Sorbonne université, 2022. https://theses.hal.science/tel-03922843.
Der volle Inhalt der QuelleBlockchain is a technology that maintains a single record of information in a decentralized and distributed manner while ensuring data security. This technology, which is behind the most popular cryptocurrency, Bitcoin, is changing the way we think about information records in distributed systems. Indeed, the cryptographic feature set and the distributed nature of the technology make blockchain one of the most secure tools available today for maintaining a record of information. The first applications to have adopted this technology are in the field of finance, where it is now possible to carry out transactions directly between users without going through a central authority. However, other fields have also shown interest in this technology, such as medicine, for the secure sharing of medical records; art and music, for the tracking of copyrights and royalties; governance, for secure voting, IoT, etc. However, to benefit from such technology it is necessary to count with high reliability and connectivity, as provided by the Internet. In mesh and mobile ad hoc networks, it is often necessary to deploy its own infrastructure and services where the infrastructure of operators are not available due to the geography of the site or to an exceptional situation as is the case of natural disasters, war zones or monitoring of protected areas to achieve specific missions. The dynamism of these networks makes it difficult to use a blockchain to maintain a record of information. Indeed, the mobility of nodes can cause partitions in the network that may or may not be desired; nodes can appear and disappear, partitions can split or reunite depending on the mobility of the nodes. This poses a problem for a traditional blockchain, as partitions in the network lead to forks (competing chains) that are often resolved by choosing the longest chain and ignoring other competing chains. For the use cases of mesh and mobile ad hoc networks that we seek to solve, the concurrent chains constructed by the effect of network partitions can be considered as legitimate chains carrying information related to a given network partition. It is therefore important to include these chains in the information register. In this thesis manuscript, we propose the Blockgraph, a blockchain-like technology capable of dealing with network partitions for mobile mesh and ad hoc networks. The Blockgraph, takes the form of a direct acyclic graph based on node mobility and inherits all the security properties of the blockchain. In addition, we propose C4M, a RAFT-based consensus algorithm that has been adapted to work with the Blockgraph and is also tolerant to network partitions. To validate our solutions, we first implemented the Blockgraph and C4M in the discrete event simulator, NS-3. We performed a first performance study of each system, then we implemented the Blockgraph in real proof-of-concept mesh routers to validate the effectiveness of our solution. Finally, we performed a performance study and presented our conclusions
Bechihi, Adel. „Joint design of control algorithms and communication protocols for Connected and Automated Vehicles“. Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPAST203.
Der volle Inhalt der QuelleIn this thesis, we address the problem of control of multi-agent systems connected over realistic models of communication systems. We mainly focus on systems of connected and automated vehicles (CAVs) that communicate through a 5G communication system, which allows two types of communication: direct communication between nodes, known as Vehicle-to-Vehicle (V2V) communications, and communication through the network infrastructure, which is the traditional way of communication in cellular networks.The thesis discusses three problems: first, we analyze the stability and convergence properties of the consensus algorithm of first-order integrator agents using a time-division multiple access (TDMA) scheme to share the network resources of a broadcast shared communication channel. Exponential stability of the considered system is proved, and an explicit bound depending on the communication system parameters is provided to estimate the convergence rate. Second, we treat the problem of formation control of a float of connected vehicles in a 5G communication context. We propose a resource allocation algorithm to select the transmitting users to achieve the desired formation while satisfying the constraints imposed by the communication system. Finally, we study the stability properties of Kalman filters for hybrid systems, i.e., systems with continuous-time dynamics observed through discrete-time measurements. Input-to-state stability (ISS) is proved for such systems relying on an appropriate Lyapunov function. This result can be considered as a first step in the robustness analysis of the overall system since it allows to treat the effects of communication errors on the controlled system stability
Lauzier, Matthieu. „Conception et validation de plateformes de communication autour du corps humain, à l'échelle de l'individu et du groupe“. Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0027/document.
Der volle Inhalt der QuelleThe technological evolutions which have taken place for the last decades allowed the emergence of new application fields, such as the wireless monitoring of physiological parameters collected on the human body, with the development of Wireless Body Area Networks (WBANs, or BANs). Mostly dedicated to the medical domain and the improvement of the patients' comfort and safety, this kind of platforms more recently extended to other kinds of activities, such as sports and leisures. According to the applicative context, the hypotheses and constraints associated to these networks can vary drastically, yielding the necessity of developing adapted communication mechanisms. The works presented in this thesis have focused on the realization of data collection platforms for mobile sports applications. In a first part, we concentrate on the individual data collection, for which we give a proof of concept in the context of a Marathon race, before aiming at a better understanding of individual channel models and cooperative mechanisms for on-body data centralization. In a second part, we are interested in dense and mobile networks consisting in an important number of coexisting BANs. Our aim is to propose distributed algorithms based on consensus to allow dynamic group detection, with a variable scale. The validation of the approaches developed in this document is performed by practical implementations and experiments at each step of this work, thanks to an important amount of real world collected data. Through extended analyzes, we provide elements allowing to characterize the communication within mobile BANs, and particularly large scale networks. Although guided by the strong applicative context of live TV broadcast, these works and analysis methods don't lose in generality, and this challenging and original context opens a lot of perspectives
Bénéteau, Laurine. „Médians de graphes : algorithmes, connexité et axiomatique“. Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0512.
Der volle Inhalt der QuelleThe median problem is one of the most investigated problem in metric graph theory. We will start by studying this problem in median graphs. We present a linear time algorithm based on the majority rule which characterize the median in median graphs and on a fast computation of the parallelism classes of the edges (the \Theta-classes) via LexBFS which is a particular breadth first search algorithm.We also provide linear time algorithms to compute the median set in the l_1-cube complexes of median graphs and in event structures. Then, we provide a characterization of the graphs with connected medians in the pth power of the graph and provide a polynomial method to check if a graph is a G^p-connected median graph, extending a result of Bandelt and Chepoi (case p=1). We use this characterization to prove that some important graph classes in metric graph theory have G2-connected medians, such as bipartite Helly graphs and bridged graphs. We will also studied the axiomatic aspect of the median function by investigating the ABC-problem, which determine the graphs (named ABC-graphs) in which the median function is the only consensus function verifying three simples axioms (A) Anonymat, (B) Betweeness and (C) Consistency. We show that modular graphs with G2-connected medians are ABC-graphs and define new axioms allowing us to characterize the median function on some graph classes. For example the graphs with connected medians (including Helly graphs). We also show that a known class of ABC-graphs (graphs satisfying the pairing property) is a proper subclass of bipartite Helly graphs and we investigate their recognition
Mårtensson, Christopher, und Linus Sjövall. „Consensus Algorithms - Flocking and Swarms“. Thesis, KTH, Optimeringslära och systemteori, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105773.
Der volle Inhalt der QuelleEtt intressant omrade inom matematiken ar att beskriva fenomenet med ockar och svarmar. Med hjalp av grafteori kan man beskriva ett system av agenter som skickar information mellan varandra och med hjalp av algoritmer som beskriver hur varje agents informationen ska uppdateras sa att konsensus nas. Om informationen beskriver en position eller foryttning i rummet kan man observera ett beteende som liknar det hos djurockar eller insektssv armar. Manga andra tillampningsomraden nns ocksa, till exempel i system av robotar nar det saknas central styrning och internt beslutstagande ar onskvart. I denna rapport kommer olika algoritmer for att uppdatera en agents status att undersokas for att bestamma vilka krav som nns for att konsensus skall nas. Forsta delen kommer att behandla ett enklare fall dar varje agent tar emot information fran en oforanderlig uppsattning agenter. Specikt sa kommer en algoritm, dar en agents status bestams av en linjar funktion som beror pa statusen hos de agenter fran vilka information mottages, att studeras. Ett krav for att denna algoritm ska na konsensus ar att varje agent bade skickar och tar emot information fran samtliga ovriga agenter, direkt eller indirekt via andra agenter. Om alla informations overforingar vags lika sa kommer alla agenter na medelvardet av agenternas initialvarden. Konsensus kan ocksa nas under mindre restriktiva villkor, om det nns en agent som skickar information till alla andra noder (direkt eller indirekt). Forandringar av systemets beteende vid olika uppdateringsalgoritmer kommer att studeras och datorsimuleringar av dessa fenomen kommer att ges. Ett intressant fall ar da informationen (ofta position, hastighet eller acceleration) endast kan tas emot fran de agenter som nns inom ett givet avstand. darmed forandras den uppsattning agenter med vilka information overfors med tiden. Detta resulterar i olinjara algoritmer och framforallt kommer simulationer och tolkningar av dessa att ges. En observation ar att om konsensus nas eller inte beror starkt pa densiteten bland agenterna i utgangslaget samt det maximala avstand vid vilket informationsoverforing kan ske.
Lambein, Patrick. „Consensus de moyenne dans les réseaux dynamiques anonymes : Une approche algorithmique“. Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX103.
Der volle Inhalt der QuelleCompact and cheap electronic components announce the near-future development of applications in which networked systems of autonomous agents are made to carry over complex tasks. These, in turn, depend on a small number of coordination primitives, which need to be programmatically implemented into potentially low-powered, and computationally limited, agents.Such applications include for example the coordination of the collective motion of mobile and vehicular networks, the distributed aggregation and processing of data measured locally in sensor networks, and the on-line repartition of processing load in the computer farms powering wide-scale services. As they address constraints that are not specific to the digital nature of the network such primitives also serve to model complex behavior of natural systems, such as flocks and neural networks.This monograph focuses on providing distributed algorithms that asymptotically compute the average of initial values, initially present at each agent of a networked system with time-varying communication links and in the absence of centralized control. Additionally, we consider the weaker problem of getting the agents to asymptotically agree on any value within the initial bounds. We focus on locally implementable algorithms, which leverage no information beyond what the agents can acquire by themselves, and which need no bootstrapping mechanism like a global start signal or a leader agent.We provide distributed average consensus algorithms that operate over dynamic networks given different local assumptions. These algorithms are computationally simple and operate in polynomial time in the number of agents.For bidirectional communications, we give a deterministic algorithm which asymptotically computes the average as long as the network never becomes permanently disconnected. For the general case of asymmetric communications, we provide a stabilizing Monte Carlo algorithm that is efficient in bandwidth and memory and operates in linear time, along with an extension by which the algorithm can be made to uniformly terminate over any connected network in which agents may start asynchronously.This contrasts with a plethora of results and techniques in which agents are provided external information – the size of the system, a bound over their degree, – helped with exogenous symmetry breaking – a leader agent, unique identifiers, – or where the network is expected to conform to a specific shape – a ring, a a complete network, a regular graph. Indeed, because very different networks may look alike to the agents, they are limited in what they can learn locally, and many functions are impossible to compute in a fully distributed manner without assuming some structure in the network or additional symmetry-breaking device. Given these stringent constraints, our contribution is to offer algorithms whose validity depends uniquely on local and instantaneous conditions. In the bidirectional model, we show that anonymous deterministic agents can asymptotically compute the average in polynomial time. For the general model of directed interactions, we allow agents to consult random oracles. Under those conditions, full information protocols are capable of solving any problem, and so we focus on the spatial complexity and tolerance to a lack of initial coordination in the agents, while offering stronger termination guarantees than in the bidirectional case. Beyond the fact that locally implementable algorithms are eminently desirable, our study contributes to mapping the limits that local interactions impose on networks
Terelius, Håkan. „Consensus Algorithms in Dynamical Network Systems“. Licentiate thesis, KTH, Reglerteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-133613.
Der volle Inhalt der QuelleQC 20131111
Koung, Daravuth. „Cooperative navigation of a fleet of mobile robots“. Electronic Thesis or Diss., Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0044.
Der volle Inhalt der QuelleThe interest in integrating multirobot systems (MRS) into real-world applications is increasing more and more, especially for performing complex tasks. For loadcarrying tasks, various load-handling strategies have been proposed such as: pushingonly, caging, and grasping. In this thesis, we aim to use a simple handling strategy: placing the carrying object on top of a group of wheeled mobile robots. Thus, it requires a rigid formation control. A consensus algorithm is one of the two formation controllers we apply to the system. We adapt a dynamic flocking controller to be used in the singleintegrator system, and we propose an obstacle avoidance that can prevent splitting while evading the obstacles. The second formation control is based on hierarchical quadratic programming (HQP). The problem is decomposed into multiple task objectives: formation, navigation, obstacle avoidance, velocity limits. These tasks are represented by equality and inequality constraints with different levels of priority, which are solved sequentially by the HQP. Lastly, a study on task allocation algorithms (Contract Net Protocol and Tabu Search) is carried out in order to determine an appropriate solution for allocating tasks in the industrial environment
Zhao, Yue. „Biopsy needles localization and tracking methods in 3d medical ultrasound with ROI-RANSAC-KALMAN“. Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0015/document.
Der volle Inhalt der QuelleIn medical examinations and surgeries, minimally invasive technologies are getting used more and more often. Some specially designed surgical instruments, like biopsy needles, or electrodes are operated by radiologists or robotic systems and inserted in human’s body for extracting cell samples or delivering radiation therapy. To reduce the risk of tissue injury and facilitate the visual tracking, some medical vision assistance systems, as for example, ultrasound (US) systems can be used during the surgical procedure. We have proposed to use the 3D US to facilitate the visualization of the biopsy needle, however, due to the strong speckle noise of US images and the large calculation load involved as soon as 3D data are involved, it is a challenge to locate the biopsy needle accurately and to track its position in real time in 3D US. In order to solve the two main problems above, we propose a method based on the RANSAC algorithm and Kalman filter. In this method, a region of interest (ROI) has been limited to robustly localize and track the position of the biopsy needle in real time. The ROI-RK method consists of two steps: the initialization step and the tracking step. In the first step, a ROI initialization strategy using Hessian based line filter measurement is implemented. This step can efficiently reduce the speckle noise of the ultrasound volume, and enhance line-like structures as biopsy needles. In the second step, after the ROI is initialized, a tracking loop begins. The RK algorithm can robustly localize and track the biopsy needles in a dynamic situation. The RANSAC algorithm is used to estimate the position of the micro-tools and the Kalman filter helps to update the ROI and auto-correct the needle localization result. Because the ROI-RK method is involved in a dynamic situation, a motion estimation strategy is also implemented to estimate the insertion speed of the biopsy needle. 3D US volumes with inhomogeneous background have been simulated to evaluate the performance of the ROI-RK method. The method has been tested under different conditions, such as insertion orientations angles, and contrast ratio (CR). The localization accuracy is within 1 mm no matter what the insertion direction is. Only when the CR is very low, the proposed method could fail to track because of an incomplete ultrasound imaging of the needle. Another methodology, i.e. RANSAC with machine learning (ML) algorithm has been presented. This method aims at classifying the voxels not only depending on their intensities, but also using some structure features of the biopsy needle. The simulation results show that the RANSAC with ML algorithm can separate the needle voxels and background tissue voxels with low CR
Capdevielle, Claire. „Étude de la complexité des implémentations d'objets concurrents, sans attente, abandonnables et/ou solo-rapides“. Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0194/document.
Der volle Inhalt der QuelleIn multiprocessor computer, synchronizations between processes are needed for the access to the shared memory. Usually this is done by using locks, but there are some issues as deadlocks or lack of fault-tolerance. We are interested in implementing abstractions (as consensus or universal construction) which ease the programming of wait-free concurrent objects, without using lock but based on atomic Read/Write operations (ARW). Only using the ARW does not permit to implement wait-free consensus. The use of primitives which offer a higher power of synchronization than the ARW is needed. But these primitives are more expensive in computing time. Therefore, we are interested in this thesis in the design of algorithms which restrict the use of these primitives only to the cases where processes are in contention. These algorithms are said solo-fast. Another direction is to allow the object to abort the computation in progress - and to return a special response "abort" - when there is contention. These objects are named abortable. On the one hand we give wait-free, abortable and/or solo-fast concurrent object implementations. Indeed we proposed a universal construction which ensure to the implemented object to be abortable and solo-fast. We have also realized solo-fast consensus algorithms and abortable consensus algorithms. On the other hand, we study the space complexity of these implementations : we prove space lower bound on the implementation of abortable object and consensus
Nicolas, François. „Alignement, séquence, consensus, recherche de similarités : complexité et approximabilité“. Montpellier 2, 2005. http://www.theses.fr/2005MON20179.
Der volle Inhalt der QuelleGuillemot, Sylvain. „Approches combinatoires pour le consensus d'arbres et de séquences“. Phd thesis, Montpellier 2, 2008. http://www.theses.fr/2008MON20234.
Der volle Inhalt der QuelleWu, Li-Fen. „Fault-tolerant distributed algorithms for consensus and termination detection /“. The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487858417981925.
Der volle Inhalt der QuelleArun, Balaji. „A Low-latency Consensus Algorithm for Geographically Distributed Systems“. Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/79945.
Der volle Inhalt der QuelleMaster of Science
Guillemot, Sylvain. „Approches Combinatoires pour le Consensus d'Arbres et de Séquences“. Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2008. http://tel.archives-ouvertes.fr/tel-00401456.
Der volle Inhalt der QuelleYang, Bo. „Analyses bioinformatiques et classements consensus pour les données biologiques à haut débit“. Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112250/document.
Der volle Inhalt der QuelleIt is thought to be more and more important to solve biological questions using Bioinformatics approaches in the post-genomic era. This thesis focuses on two problems related to high troughput data: bioinformatics analysis at a large scale, and development of algorithms of consensus ranking. In molecular biology and genetics, RNA splicing is a modification of the nascent pre-messenger RNA (pre-mRNA) transcript in which introns are removed and exons are joined. The U2AF heterodimer has been well studied for its role in defining functional 3’ splice sites in pre-mRNA splicing, but multiple critical problems are still outstanding, including the functional impact of their cancer-associated mutations. Through genome-wide analysis of U2AF-RNA interactions, we report that U2AF has the capacity to define ~88% of functional 3’ splice sites in the human genome. Numerous U2AF binding events also occur in other genomic locations, and metagene and minigene analysis suggests that upstream intronic binding events interfere with the immediate downstream 3’ splice site associated with either the alternative exon to cause exon skipping or competing constitutive exon to induce inclusion of the alternative exon. We further build up a U2AF65 scoring scheme for predicting its target sites based on the high throughput sequencing data using a Maximum Entropy machine learning method, and the scores on the up and down regulated cases are consistent with our regulation model. These findings reveal the genomic function and regulatory mechanism of U2AF, which facilitates us understanding those associated diseases.Ranking biological data is a crucial need. Instead of developing new ranking methods, Cohen-Boulakia and her colleagues proposed to generate a consensus ranking to highlight the common points of a set of rankings while minimizing their disagreements to combat the noise and error for biological data. However, it is a NP-hard questioneven for only four rankings based on the Kendall-tau distance. In this thesis, we propose a new variant of pivot algorithms named as Consistent-Pivot. It uses a new strategy of pivot selection and other elements assignment, which performs better both on computation time and accuracy than previous pivot algorithms
Bhattacharya, Shaondip. „Multi-agent System Distributed Sensor Fusion Algorithms“. Thesis, Luleå tekniska universitet, Rymdteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65839.
Der volle Inhalt der QuelleGramm, Jens. „Fixed-parameter algorithms for the consensus analysis of genomic data“. [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=973911271.
Der volle Inhalt der QuelleJohansson, Björn, T. Keviczky, Mikael Johansson und Karl Henrik Johansson. „Subgradient methods and consensus algorithms for solving convex optimization problems“. KTH, Reglerteknik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-80707.
Der volle Inhalt der Quelle© 2008 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
QC 20120214
Pan, Guodong, und 潘国栋. „Motion segmentation by adaptive mode seeking and clustering consensus“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48199369.
Der volle Inhalt der Quellepublished_or_final_version
Computer Science
Doctoral
Doctor of Philosophy
Silva, Pereira Silvana. „Distributed consensus algorithms for wireless sensor networks: convergence analysis and optimization“. Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/131997.
Der volle Inhalt der QuelleLas redes de sensores inalámbricos se utilizan para monitorizar zonas de interés con el propósito final de estimar parámetros físicos y/o detectar situaciones de emergencia en gran variedad de aplicaciones militares y civiles. Una red de sensores inalámbricos puede ser considerada como un método de computación distribuido, donde nodos provistos de sensores toman medidas del entorno para calcular una función que depende de éstas. Las áreas de investigación comprenden desde el diseño de dispositivos hardware pequeños y fiables hasta algoritmos de baja complejidad o protocolos de comunicación de bajo consumo energético. Los algoritmos de consenso distribuidos son esquemas iterativos de baja complejidad que han suscitado mucha atención en diferentes campos debido a su gran espectro de aplicaciones, en los que nodos vecinos se comunican para calcular el promedio de un conjunto de medidas iniciales de la red. Dado que la energía es un recurso escaso en redes de sensores inalámbricos, la convergencia de dichos algoritmos de consenso, caracterizada por el número total de iteraciones hasta alcanzar un valor estacionario, es un importante tema de estudio. Esta tesis doctoral aborda problemas de convergencia y optimización de algoritmos de consenso distribuidos para la estimación de parámetros en redes de sensores inalámbricos. El impacto del ruido de cuantización en la convergencia se estudia en redes con topología fija y enlaces de comunicación simétricos. En particular, se propone un nuevo esquema que incluye el proceso de cuantización y se demuestra que el error cuadrático medio respecto del promedio inicial converge. Igualmente, se obtiene una expresión cerrada del límite del error cuadrático medio, y una cota superior para este límite que depende únicamente de parámetros generales de la red. La convergencia de los algoritmos de consenso en redes con topología aleatoria se estudia prestando especial atención a la convergencia en valor esperado, la convergencia en media cuadrática y la convergencia casi segura, y a partir del análisis se derivan expresiones cerradas útiles para minimizar el tiempo de convergencia. Para redes aleatorias con enlaces asimétricos, se obtienen expresiones cerradas del error cuadrático medio del estado suponiendo enlaces con probabilidad idéntica y con pesos uniformes, y se demuestra la convergencia en media cuadrática al promedio estadístico de las medidas iniciales. Se deduce una cota superior para el error cuadrático medio para el caso de enlaces con probabilidades de conexión diferentes y se propone, además, un esquema práctico con potencias de transmisión aleatorias, que mejora el rendimiento en términos de consumo de energía con respecto a una red fija. Las expresiones para el error cuadrático medio proporcionan una forma de caracterizar la desviación del vector de estado con respecto del promedio inicial cuando los enlaces instantáneos son asimétricos. Con el fin de minimizar el tiempo de convergencia en redes aleatorias con enlaces correlados espacialmente, se considera un criterio que establece una condición suficiente que garantiza la convergencia casi segura al espacio de consenso. Este criterio, que también es válido para topologías con enlaces espacialmente independientes, utiliza el radio espectral de una matriz semidefinida positiva para la cual se obtienen expresiones cerradas suponiendo enlaces con pesos uniformes. La minimización de dicho radio espectral es un problema de optimización convexa y, por lo tanto, el valor de los pesos óptimos puede calcularse de forma eficiente. Las expresiones obtenidas son generales y aplican no sólo para redes aleatorias con topologías dirigidas, sino también para redes aleatorias con topologías no dirigidas. Además, las expresiones generales pueden ser particularizadas para obtener protocolos conocidos en la literatura, demostrando que éstos últimos pueden ser considerados como casos particulares de las expresiones proporcionadas en esta tesis.
Liu, Yang. „Distributed Algorithms for Consensus and Formation Control in Scalable Robotic Swarms“. Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1528376075213318.
Der volle Inhalt der QuelleFRANCESCHELLI, MAURO. „Consensus Algorithms for Estimation and Discrete Averaging in Networked Control Systems“. Doctoral thesis, Università degli Studi di Cagliari, 2011. http://hdl.handle.net/11584/266297.
Der volle Inhalt der QuelleKueh, Reng Yi. „Evaluating Byzantine-Based Blockchain Consensus Algorithms for Sarawak’s Digitalized Pepper Value Chain“. Thesis, Curtin University, 2022. http://hdl.handle.net/20.500.11937/88810.
Der volle Inhalt der QuellePedroncelli, Giovanni. „Distributed Discrete Consensus Algorithms: Theory and Applications for the Task Assignment Problem“. Doctoral thesis, Università degli studi di Trieste, 2015. http://hdl.handle.net/10077/10975.
Der volle Inhalt der QuelleDistributed computation paradigms belong to a research field of increasing interest. Using these algorithms will allow to exploit the capabilities of large scale networks and systems in the near future. Relevant information for the resolution of a problem are distributed among a network of agents with limited memory and computation capability; the problem is solved only by means of local computation and message exchange between neighbour agents. In this thesis we consider the multi-agent assignment problem dealt with distributed computation: a network of agents has to cooperatively negotiate the assignment of a number of tasks by applying a distributed discrete consensus algorithm which defines how the agents exchange information. Consensus algorithms are dealt with always more frequently in the related scientific literature. Therefore, in the first chapter of this thesis we present a related literature review containing some of the most interesting works concerning distributed computation and, in particular, distributed consensus algorithms: some of these works deal with the theory of consensus algorithms, in particular convergence properties, others deal with applications of these algorithms. In the second chapter the main contribution of this thesis is presented: aniterative distributed discrete consensus algorithm based on the resolution of local linear integer optimization problems (L-ILPs) to be used for the multi-agent assignment problem. The algorithm is characterized by theorems proving convergence to a final solution and the value of the convergence time expressed in terms of number of iterations. The chapter is concluded by a performance analysis by means of the results of simulations performed with Matlab software. All the results are presented considering two different network topologies in order to model two different real life scenarios for the connection among agents. The third chapter presents an interesting application of the proposed algorithm: a network of charging stations (considered as agents) has to reach a consensus on the assignment of a number of Electric Vehicles (EVs) requiring to be recharged. In this application the algorithm proposed in the previous chapter undergoes several modifications in order to model effectively this case: considering the inter-arrival times of vehicles to a charging station, a non-linear element appears in the objective function and therefore a novel algorithm to be performed before the assignment algorithm is presented; this algorithm defines the order in which the assigned vehicles have to reach a charging station. Moreover, a communication protocol is proposed by which charging stations and vehicles can communicate and exchange information also allowing charging stations to send to each assigned vehicle the maximum waiting time which can pass before a vehicle loses its right to be recharged. The chapter ends with an example of application of the rivisited assignment algorithm. In the fourth and last chapter, we present an application in an industrial environment: a network of Autonomous Guided Vehicles (AGVs) in a warehouse modeled as a graph has to perform the distributed discrete consensus algorithm in order to assign themselves a set of destinations in which some tasks are located. This application deals not only with the task assignment problem but also with the following destination reaching problem: therefore a distributed coordination algorithm is proposed which allows the AGVs to move into the warehouse avoiding collisions and deadlock. An example of the control strategy application involving both the assignment and coordination algorithms concludes this chapter.
XXVII Ciclo
1986
Nguyen, Thanh-Khoa. „Image segmentation and extraction based on pixel communities“. Thesis, La Rochelle, 2019. http://www.theses.fr/2019LAROS035.
Der volle Inhalt der QuelleImage segmentation has become an indispensable task that is widely employed in several image processing applications including object detection, object tracking, automatic driver assistance, and traffic control systems, etc. The literature abounds with algorithms for achieving image segmentation tasks. These methods can be divided into some main groups according to the underlying approaches, such as Region-based image segmentation, Feature-based clustering, Graph-based approaches and Artificial Neural Network-based image segmentation. Recently, complex networks have mushroomed both theories and applications as a trend of developments. Hence, image segmentation techniques based on community detection algorithms have been proposed and have become an interesting discipline in the literature. In this thesis, we propose a novel framework for community detection based image segmentation. The idea that brings social networks analysis domain into image segmentation quite satisfies with most authors and harmony in those researches. However, how community detection algorithms can be applied in image segmentation efficiently is a topic that has challenged researchers for decades. The contribution of this thesis is an effort to construct best complex networks for applying community detection and proposal novel agglomerate methods in order to aggregate homogeneous regions producing good image segmentation results. Besides, we also propose a content based image retrieval system using the same features than the ones obtained by the image segmentation processes. The proposed image search engine for real images can implement to search the closest similarity images with query image. This content based image retrieval relies on the incorporation of our extracted features into Bag-of-Visual-Words model. This is one of representative applications denoted that image segmentation benefits several image processing and computer visions applications. Our methods have been tested on several data sets and evaluated by many well-known segmentation evaluation metrics. The proposed methods produce efficient image segmentation results compared to the state of the art
Macdonald, Edward A. „Multi-robot assignment and formation control“. Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41200.
Der volle Inhalt der QuelleBrinda, Karel. „Nouvelles techniques informatiques pour la localisation et la classification de données de séquençage haut débit“. Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1027/document.
Der volle Inhalt der QuelleSince their emergence around 2006, Next-Generation Sequencing technologies have been revolutionizing biological and medical research. Obtaining instantly an extensive amount of short or long reads from almost any biological sample enables detecting genomic variants, revealing the composition of species in a metagenome, deciphering cancer biology, decoding the evolution of living or extinct species, or understanding human migration patterns and human history in general. The pace at which the throughput of sequencing technologies is increasing surpasses the growth of storage and computer capacities, which still creates new computational challenges in NGS data processing. In this thesis, we present novel computational techniques for the problems of read mapping and taxonomic classification. With more than a hundred of published mappers, read mapping might be considered fully solved. However, the vast majority of mappers follow the same paradigm and only little attention has been paid to non-standard mapping approaches. Here, we propound the so-called dynamic mapping that we show to significantly improve the resulting alignments compared to traditional mapping approaches. Dynamic mapping is based on exploiting the information from previously computed alignments, helping to improve the mapping of subsequent reads. We provide the first comprehensive overview of this method and demonstrate its qualities using Dynamic Mapping Simulator, a pipeline that compares various dynamic mapping scenarios to static mapping and iterative referencing. An important component of a dynamic mapper is an online consensus caller, i.e., a program collecting alignment statistics and guiding updates of the reference in the online fashion. We provide OCOCO, the first online consensus caller that implements a smart statistics for individual genomic positions using compact bit counters. Beyond its application to dynamic mapping, OCOCO can be employed as an online SNP caller in various analysis pipelines, enabling calling SNPs from a stream without saving the alignments on disk. Metagenomic classification of NGS reads is another major problem studied in the thesis. Having a database of thousands reference genomes placed on a taxonomic tree, the task is to rapidly assign to tree nodes a huge amount of NGS reads, and possibly estimate the relative abundance of involved species. In this thesis, we propose improved computational techniques for this task. In a series of experiments, we show that spaced seeds consistently improve the classification accuracy. We provide Seed-Kraken, a spaced seed extension of Kraken, the most popular classifier at present. Furthermore, we suggest a new indexing strategy based on a BWT-index, obtaining a much smaller and more informative index compared to Kraken. We provide a modified version of BWA that improves the BWT-index for a quick k-mer look-up
Alekeish, Khaled. „Design and performance study of algorithms for consensus in sparse, mobile ad-hoc networks“. Thesis, University of Newcastle Upon Tyne, 2011. http://hdl.handle.net/10443/1237.
Der volle Inhalt der QuelleMessina, Carl J. „Labeled sampling consensus a novel algorithm for robustly fitting multiple structures using compressed sampling“. Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4983.
Der volle Inhalt der QuelleID: 030423298; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (M.S.E.E.)--University of Central Florida, 2011.; Includes bibliographical references (p. 70-72).
M.S.E.E.
Masters
Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering
Hanaf, Anas. „Algorithmes distribués de consensus de moyenne et leurs applications dans la détection des trous de couverture dans un réseau de capteurs“. Thesis, Reims, 2016. http://www.theses.fr/2016REIMS018/document.
Der volle Inhalt der QuelleDistributed consensus algorithms are iterative algorithms of low complexity where neighboring sensors interact with each other to reach an agreement without coordinating unit. As the nodes in a wireless sensor network have limited computing power and limited battery, these distributed algorithms must reach a consensus in a short time and with little message exchange. The first part of this thesis is based on the study and comparison of different consensus algorithms synchronously and asynchronously in terms of convergence speed and communication rates. The second part of our work concerns the application of these consensus algorithms to the problem of detecting coverage holes in wireless sensor networks.This coverage problem also provides the context for the continuation of our work. This problem is described as how a region of interest is monitored by sensors. Different geometrical approaches have been proposed but are limited by the need to know exactly the position of the sensors; but this information may not be available if the locating devices such as GPS are not on the sensors. From the mathematical tool called algebraic topology, we have developed a distributed algorithm of coverage hole detection searching a harmonic function of a network, that is to say canceling the operator of the 1-dimensional Laplacian. This harmonic function is connected to the homology group H1 which identifies the coverage holes. Once a harmonic function obtained, detection of the holes is realized by a simple random walk in the network
Yao, Lisha. „Distributed Consensus, Optimization and Computation in Networked Systems“. Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1404555/.
Der volle Inhalt der QuelleDe, Martino Davide. „Analisi dei più diffusi Algoritmi di consenso Blockchain“. Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Den vollen Inhalt der Quelle findenBlanchard, Peva. „Synchronization and Fault-tolerance in Distributed Algorithms“. Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112219/document.
Der volle Inhalt der QuelleIn the first part of this thesis, we focus on a recent model, calledpopulation protocols, which describes large networksof tiny wireless mobile anonymous agents with very limited resources.The harsh constraints of the original model makes most of theclassical problems of distributed algorithmics, such as datacollection, consensus and leader election, either difficult to analyzeor impossible to solve.We first study the data collection problem, which mainly consists intransferring some values to a base station. By using a fairnessassumption, known as cover times, we compute tight bounds on theconvergence time of concrete protocols. Next, we focus on theproblems of consensus and leader election. It is shown that theseproblems are impossible in the original model. To circumvent theseissues, we augment the original model with oracles, and study theirrelative power. We develop by the way a formal framework generalenough to encompass various sorts of oracles, as well as theirrelations.In the second part of the thesis, we study the problem ofstate-machine replication in the more classical model of asynchronousmessage-passing communication. The Paxos algorithm is a famous(partial) solution to the state-machine replication problem whichtolerates crash failures. Our contribution is the enhancement of Paxosin order to tolerate transient faults as well. Doing so, we define thenotion of practically self-stabilizing replicated state-machine
Saberian, Aminmohammad. „Applying adjacency based control to distribution networks“. Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/126755/1/Aminmohammad_Saberian_Thesis.pdf.
Der volle Inhalt der QuelleTravers, Corentin. „Derrière le consensus : coordination faiblement contrainte dans les systèmes distribués asynchrones“. Phd thesis, Université Rennes 1, 2007. http://tel.archives-ouvertes.fr/tel-00485704.
Der volle Inhalt der QuelleJafarizadeh, Saber. „Distributed coding and algorithm optimization for large-scale networked systems“. Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/13238.
Der volle Inhalt der QuelleGrandi, Raffaele <1976>. „Coordination and Control of Autonomous Mobile Robots Swarms by using Particle Swarm Optimization Algorithm and Consensus Theory“. Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5904/1/Grandi_Raffaele_tesi.pdf.
Der volle Inhalt der QuelleGrandi, Raffaele <1976>. „Coordination and Control of Autonomous Mobile Robots Swarms by using Particle Swarm Optimization Algorithm and Consensus Theory“. Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5904/.
Der volle Inhalt der QuelleLovisari, Enrico. „Synchronization algorithms for multi-agent systems: Analysis, Synthesis and Applications“. Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3422115.
Der volle Inhalt der QuelleQuesta tesi di dottorato e incentrata sullo studio dell'interazione di agenti interconnessi in rete. In questa tesi vengono affrontati tre problemi complementari l'un l'altro: Analisi di reti di consenso, Sintesi di reti di consenso di ordine superiore, e Applicazione di algoritmi di sincronizzazione
Obando, Bravo German Dario. „Distributed methods for resource allocation : a passivity based approach“. Thesis, Nantes, Ecole des Mines, 2015. http://www.theses.fr/2015EMNA0174/document.
Der volle Inhalt der QuelleSince the complexity and scale of systems have been growing in the last years, distributed approaches for control and decision making are becoming more prevalent. This dissertation focuses on an important problem involving distributed control and decision making, the dynamic resource allocation in a network. To address this problem, we explore a consensus--based algorithm that does not require any centralized computation, and that is capable to deal with applications modeled either by dynamical systems or by memoryless functions. The main contribution of our research is to prove, by means of graph theoretical tools and passivity analysis, that the proposed controller asymptotically reaches an optimal solution without the need of full information. In order to illustrate the relevance of our main result, we address several engineering applications including: distributed control for energy saving in smart buildings, management of the customers of an aggregating entity in a smart grid environment, and development of an exact distributed optimization method that deals with resource allocation problems subject to lower--bound constraints. Finally, we explore resource allocation techniques based on classic population dynamics models. In order to make them distributed, we introduce the concept of non--well--mixed population dynamics. We show that these dynamics are capable to deal with constrained information structures that are characterized by non--complete graphs. Although the proposed non--well--mixed population dynamics use partial information, they preserve similar properties of their classic counterpart, which uses full information. Specifically, we prove mass conservation and convergence to Nash equilibrium
Dado que la complejidad y la escala de los sistemas sehan ido incrementando en los últimos años, las técnicas centralizadas de control y toma de decisiones están siendo reemplazadas por métodos distribuidos. Esta tesis se centra en un importante problema que involucra control y toma de decisiones distribuidas: la asignación dinámica de recursos en redes. Para abordar este problema, exploramos un algoritmo basado en consenso que no requiere computación centralizada, y que puede ser usado en aplicaciones modeladas ya sea por sistemas dinámicos o funciones sin memoria. La principal contribución de esta tesis es probar, por medio de teoría de grafos y pasividad, que el algoritmo propuesto alcanza asintóticamente una solución óptima sin la necesidad de usar información completa. Para ilustrar la relevancia del resultado principal de esta disertación, abordamos varias aplicaciones en ingeniería,incluyendo: el control distribuido en edificios inteligentes orientado a la eficiencia energética, la gestión de los clientes de un agregador en una red inteligente en la que se aplican estrategias de respuesta de la demanda, y el desarrollo de un método de optimización exacto que permite incluir restricciones de límite inferior. Finalmente, se exploran otras técnicas de asignación derecursos inspiradas en modelos de dinámicas poblacionales. Se introduce el concepto de poblaciones no—bien—mezcladas, y se muestra que las dinámicas asociadas a este tipo de poblaciones cuentan con una estructura de información local, caracterizada por grafos que no son completos. A pesar de que las dinámicas propuestas usan información parcial, ellas preservan características similares a las dinámicas poblacionales clásicas que usan información completa
Mezgebe, Tsegay Tesfay. „Algorithmes inspirés des sociales pour concevoir des nouveaux systèmes de pilotage dans le contexte de l'usine du futur“. Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0006.
Der volle Inhalt der QuelleThe use of traditionally centralized control system does not able to meet the rapidly changing customer expectations, high product varieties, and shorter product life-cycles. In particular, the emergence of Cyber Physical System (CPS) which can be seen as interacting networks of physical and computational components has provided the foundation for many new factories’ infrastructures and improved the quality of products and processes. This Cyber Physical System has dramatically impacted the centrally predictive control system in responding to perturbation(s) in the current dynamic market characteristics. Urgent change for example is one of the common perturbations and has significant perturbing ability to a central predictive control system. Accordingly, it is now accepted that using agent-based control system improves the reactivity to treat these perturbation(s) until they are no longer limiting factors. In this study, the use of human-inspired interaction approach (by means of negotiation and consensus-based decision-making algorithms) is explored to design and propose a new control system. It has taken advantages from Industry 4.0 assets and encompassed heterogeneous and intelligent entities (mainly the product entities and resource entities) and discrete event systems. Each entity could have different capability (evolution, learning, etc.) and the whole physical and control system may lead emerging behaviors to dynamically adapt the perturbation(s). Hence, every intelligent entity decides when to broadcast its current state to neighbor entities and the controlling decision depends on the behavior of this state. The negotiation and consensus-based decision-making algorithms were initially formulated and modeled by networking all the contributing and heterogeneous entities considering two real industrial shop floors. Then after, simulation and application implementation tests on the basis of full-sized academic platform called TRACILOGIS platform have been conducted to verify and validate these decision-making algorithms. This has been done with expectations that the applicability of these algorithms will be more adaptable to set best priority-based product sequencing and rescheduling than another decision-making approach called pure reactive control approach. Accordingly, the experimental results have shown that the negotiation and consensus among the decisional entities have significantly minimized the impact of perturbation(s) on a production process launched on the TRACILOGIS platform. Meanwhile, using these two decision-making algorithms has conveyed better global performance (e.g., minimized makespan) over the pure reactive control approach