Dissertations / Theses on the topic 'Logique inductive'
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Alphonse, Erick. "Macro-opérateurs en Programmation Logique Inductive : théorie et algorithmes." Paris 11, 2003. http://www.theses.fr/2003PA112334.
Full textSerrurier, Mathieu. "Programmation logique inductive floue et possibilité : gagner en expressivité, adaptabilité, ou en efficacité." Toulouse 3, 2005. http://www.theses.fr/2005TOU30277.
Full textThis thesis is about different ways for using possibilistic logic and fuzzy sets in inductive logic programming (ILP). An original ILP algorithm based on simulated annealing is proposed as a basis algorithm for experimentations. Two ways have been chosen for the using of fuzzy sets in ILP. First, fuzzy sets are used for describing rules which have not crisp counterparts such as gradual rules or certainty rules. Fuzzy sets may be also used for improving robustness of rules with respect to variations when discretization of numerical attributes is needed. Moreover, an algorithm for inducing rules together with its implication operator is also presented. Possibilistic logic is also used in two different ways in ILP: for dealing with exceptions (misclassification) in classical ILP problem by taking advantage of the non monotonic properties of possibilistic logic or for dealing with weighted databases
Fromont, Elisa. "Apprentissage multisource par programmation logique inductive : application à la caractérisation d'arythmies cardiaques." Phd thesis, Université Rennes 1, 2005. http://tel.archives-ouvertes.fr/tel-00011455.
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Fromont, Élisa Cordier Marie-Odile. "Apprentissage multisource par programmation logique inductive application à la caractérisation d'arythmies cardiques /." [S.l.] : [s.n.], 2005. ftp://ftp.irisa.fr/techreports/theses/2005/fromont.pdf.
Full textFromont, Élisa. "Apprentissage multisource par programmation logique inductive : application à la caractérisation d'arythmies cardiques." Rennes 1, 2005. https://tel.archives-ouvertes.fr/tel-00011455v2.
Full textDecoster, Jean. "Programmation logique inductive pour la classification et la transformation de documents semi-structurés." Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10046/document.
Full textThe recent proliferation of XML documents in databases and web applications rises some issues due to the numerous data exchanged and their diversity. To ease their uses, some smart means have been developed such as automatic classification and transformation. This thesis has two goals:• To propose a framework for the XML documents classification task.• To study the XML documents transformation learning.We have chosen to use Inductive Logic Programming. The expressiveness of logic programs grants flexibility in specifying the learning task and understandability to the induced theories. This flexibility implies a high computational cost, constraining the applicability of ILP systems. However, XML documents being trees, a good concession can be found.For our first contribution, we define clauses languages that allow encoding xml trees. The definition of our classification framework follows their studies. It stands on a rewriting of the standard ILP operations such as theta-subsumption and least general generalization [Plotkin1971]. Our algorithms are polynomials in time in the input size whereas the standard ones are exponentials. They grant an identification in the limit [Gold1967] of our languages.Our second contribution is the building of methods to learn XML documents transformations. It begins by the definition of a clauses class in the way of functional programs [Paulson91]. They are an ILP adaptation of edit scripts and allow a context. Their learning is possible thanks to two A*-like algorithms, a common ILP approach (HOC-Learner [Santos2009])
Ciaffaglione, Alberto. "Certified reasoning on real numbers and objects in co-inductive type theory." Vandoeuvre-les-Nancy, INPL, 2003. http://docnum.univ-lorraine.fr/public/INPL_T_2003_CIAFFAGLIONE_A.pdf.
Full textWe adopt Formal Methods based on Type Theory for reasoning on the semantics of computer programs: the ultimate goal is to prove that a fragment of software meets its formal specification. Application areas of our research are the Real Numbers datatype and the Object-oriented Languages based on Objects. In the first part we construct the Real Numbers using streams, i. E. Infinite sequences, of signed digits. We implement the Reals in Coq using streams, which are managed using coinductive judgments and corecursive algorithms. Then we introduce a constructive axiomatization and we use it for proving the adequacy of our construction. In the second part we approach Object-based Calculi with side-effects, focusing on Abadi and Cardelli's imp[sigma]. We reformulate imp[sigma] using modern encoding techniques, as Higher-Order Abstract Syntax and Coinductive proof systems in Natural Deduction style. Then we formalize imp[sigma] in Coq and we prove the Type Soundness
Lopez, Matthieu. "Apprentissage de problèmes de contraintes." Phd thesis, Université d'Orléans, 2011. http://tel.archives-ouvertes.fr/tel-00668156.
Full textSiou, Emmanuel. "Programmation logique inductive et modelisation de l'apprenant : application a l'analyse des erreurs de raisonnement chez l'aphasique." Rennes 1, 1994. http://www.theses.fr/1994REN10176.
Full textRodrigues, Christophe. "Apprentissage incrémental des modèles d'action relationnels." Paris 13, 2013. http://scbd-sto.univ-paris13.fr/secure/edgalilee_th_2013_rodrigues.pdf.
Full textIn this thesis, we study machine learning for action. Our work both covers reinforcement learning (RL) and inductive logic programming (ILP). We focus on learning action models. An action model describes the preconditions and effects of possible actions in an environment. It enables anticipating the consequences of the agent’s actions and may also be used by a planner. We specifically work on a relational representation of environments. They allow to describe states and actions by the means of objects and relations between the various objects that compose them. We present the IRALe method, which learns incrementally relational action models. First, we presume that states are fully observable and the consequences of actions are deterministic. We provide a proof of convergence for this method. Then, we develop an active exploration approach which allows focusing the agent’s experience on actions that are supposedly non-covered by the model. Finally, we generalize the approach by introducing a noisy perception of the environment in order to make our learning framework more realistic. We empirically illustrate each approach’s importance on various planification problems. The results obtained show that the number of interactions necessary with the environments is very weak compared to the size of the considered states spaces. Moreover, active learning allows to improve significantly these results
Marquis, Pierre. "Contribution à l'étude des méthodes de construction d'hypothèses en intelligence artificielle." Nancy 1, 1991. http://www.theses.fr/1991NAN10031.
Full textPavaux, Alice. "Inductive, Functional and Non-Linear Types in Ludics." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCD092.
Full textThis thesis investigates the types of ludics. Within the context of the Curry–Howard correspondence,l udics is a framework in which the dynamic aspects of both logic and programming can be studied. The basic objects, called designs, are untyped infinitary proofs that can also beseen as strategies from the perspective of game semantics, and a type or behaviour is a set of designs well-behaved with respect to interaction. We are interested in observing the interactive properties of behaviours. Our attention is particularly focused on behaviours representing the types of data and functions, and on non-linear behaviours which allow the duplication of objects. A new internal completeness result for infinite unions unveils the structure of inductive data types. Thanks to an analysis of the visitable paths, i.e., the possible execution traces, we prove that inductive and functional behaviours are regular, paving the way for a characterisation of MALL in ludics. We also show that a functional behaviour is pure, a property ensuring the safety of typing, if and only if it is not a type of functions taking functions as argument. Finally,we set the bases for a precise study of non-linearity in ludics by recovering a form of internal completeness and discussing the visitable paths
Le, Tan. "Intégration de l'inférence abductive et inductive pour la représentation des connaissances dans les réseaux de gènes." Phd thesis, Université Paul Sabatier - Toulouse III, 2014. http://tel.archives-ouvertes.fr/tel-00996894.
Full textJacquemin, Ingrid. "Découverte de motifs relationnels en bioinformatique : application à la prédiction de ponts disulfures." Phd thesis, Université Rennes 1, 2005. http://tel.archives-ouvertes.fr/tel-00185499.
Full textCette thèse propose l'exploration de deux nouvelles pistes pour progresser dans la résolution de prédiction de ponts disulfures dans les protéines. Cette liaison covalente stabilise et contraint fortement la conformation spatiale de la protéine et la connaissance des positions où elle intervient peut réduire considérablement la complexité du problème de la prédiction de la structure 3D. Pour cela, nous utilisons dans un premier temps, l'inférence grammaticale et plus particulièrement les langages de contrôle introduit par Y. Takada, puis dans un deuxième temps, la programmation logique inductive.
Diverses expériences visent à confronter un cadre théorique d'apprentissage et des algorithmes généraux d'inférence grammaticale régulière à une application pratique de prédiction d'appariements spécifiques au sein d'une séquence protéique. D'autres expérimentations montrent que la programmation logique inductive donne de bons résultats sur la prédiction de l'état oxydé des cystéines en inférant des règles interprétables par les biologistes. Nous proposons un algorithme d'induction heuristique dont l'idée est d'effectuer plusieurs phases d'apprentissage en tenant compte des résultats obtenus aux phases précédentes permettant ainsi de diminuer considérablement la combinatoire dans les espaces d'hypothèses logiques en construisant des règles de plus en plus discriminantes.
Silva, Bernardes Juliana. "Evolution et apprentissage automatique pour l'annotation fonctionnelle et la classification des homologies lointains en protéines." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00684155.
Full textAmaniss, Ali. "Méthodes de schématisation pour la démonstration automatique." Nancy 1, 1996. http://www.theses.fr/1996NAN10092.
Full textAugier, Sébastien. "Apprentissage Supervisé Relationnel par Algorithmes d'Évolution." Phd thesis, Université Paris Sud - Paris XI, 2000. http://tel.archives-ouvertes.fr/tel-00947322.
Full textPersoneni, Gabin. "Apport des ontologies de domaine pour l'extraction de connaissances à partir de données biomédicales." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0235/document.
Full textThe semantic Web proposes standards and tools to formalize and share knowledge on the Web, in the form of ontologies. Biomedical ontologies and associated data represents a vast collection of complex, heterogeneous and linked knowledge. The analysis of such knowledge presents great opportunities in healthcare, for instance in pharmacovigilance. This thesis explores several ways to make use of this biomedical knowledge in the data mining step of a knowledge discovery process. In particular, we propose three methods in which several ontologies cooperate to improve data mining results. A first contribution of this thesis describes a method based on pattern structures, an extension of formal concept analysis, to extract associations between adverse drug events from patient data. In this context, a phenotype ontology and a drug ontology cooperate to allow a semantic comparison of these complex adverse events, and leading to the discovery of associations between such events at varying degrees of generalization, for instance, at the drug or drug class level. A second contribution uses a numeric method based on semantic similarity measures to classify different types of genetic intellectual disabilities, characterized by both their phenotypes and the functions of their linked genes. We study two different similarity measures, applied with different combinations of phenotypic and gene function ontologies. In particular, we investigate the influence of each domain of knowledge represented in each ontology on the classification process, and how they can cooperate to improve that process. Finally, a third contribution uses the data component of the semantic Web, the Linked Open Data (LOD), together with linked ontologies, to characterize genes responsible for intellectual deficiencies. We use Inductive Logic Programming, a suitable method to mine relational data such as LOD while exploiting domain knowledge from ontologies by using reasoning mechanisms. Here, ILP allows to extract from LOD and ontologies a descriptive and predictive model of genes responsible for intellectual disabilities. These contributions illustrates the possibility of having several ontologies cooperate to improve various data mining processes
Mbaye, Maïssa. "Les systèmes cognitifs dans les réseaux autonomes : une méthode d'apprentissage distribué et collaboratif situé dans le plan de connaissance pour l'auto-adaptation." Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13976/document.
Full textOne of the major challenges for decades to come, in the field of information technologies and the communication, is realization of autonomic paradigm. It aims to enable network equipments to self-manage, enable them to self-configure, self-optimize, self-protect and self-heal according to high-level objectives of their designers. Major architectures of autonomic networking are based on closed control loop allowing self-adapting (self-configuring and self-optimizing) of the network equipment according to the events which arise on their environment. Knowledge plane is one approach, very emphasis these last years by researchers, which suggests the use of the cognitive systems (machine learning and the reasoning) to realize closed control loop. However, although the major autonomic architectures integrate machine learning modules as functional block, few researches are really interested in the contents of these blocks. It is in this context that we made a study on the potential contribution machine learning and proposed a method of distributed and collaborative machine learning. We propose a formalization self-adapting problem in term of learning configuration strategies (state-actions) problem. This formalization allows us to define a strategies machine learning method for self-adapting which is based on the history observed transitions and uses inductive logic programming to discover new strategies from those already discovered. We defined, also a knowledge sharing algorithm which makes network components collaborate to improve learning process. Finally, we tested our approach in DiffServ context and showed its transposition on multimedia streaming in 802.11 wireless networks
Belkasmi, Mohammed. "Contributions à la théorie des modèles positive." Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00733592.
Full textBayoudh, Meriam. "Apprentissage de connaissances structurelles à partir d’images satellitaires et de données exogènes pour la cartographie dynamique de l’environnement amazonien." Thesis, Antilles-Guyane, 2013. http://www.theses.fr/2013AGUY0671/document.
Full textClassical methods for satellite image analysis are inadequate for the current bulky data flow. Thus, automate the interpretation of such images becomes crucial for the analysis and management of phenomena changing in time and space, observable by satellite. Thus, this work aims at automating land cover cartography from satellite images, by expressive and easily interpretable mechanism, and by explicitly taking into account structural aspects of geographic information. It is part of the object-based image analysis framework, and assumes that it is possible to extract useful contextual knowledge from maps. Thus, a supervised parameterization methods of a segmentation algorithm is proposed. Secondly, a supervised classification of geographical objects is presented. It combines machine learning by inductive logic programming and the multi-class rule set intersection approach. These approaches are applied to the French Guiana coastline cartography. The results demonstrate the feasibility of the segmentation parameterization, but also its variability as a function of the reference map classes and of the input data. Yet, methodological developments allow to consider an operational implementation of such an approach. The results of the object supervised classification show that it is possible to induce expressive classification rules that convey consistent and structural information in a given application context and lead to reliable predictions, with overall accuracy and Kappa values equal to, respectively, 84,6% and 0,7. In conclusion, this work contributes to the automation of the dynamic cartography from remotely sensed images and proposes original and promising perpectives
Martin, Lionel. "Induction de programmes logiques avec negation." Orléans, 1996. http://www.theses.fr/1996ORLE2069.
Full textNeves, Rui da Silva. "Interactions entre induction et déduction dans le raisonnement humain." Paris 8, 1995. http://www.theses.fr/1995PA081063.
Full textThis work is a contribution to the study of the processes of inference implied in causal and dispositional attributions, which underlie a wide spectrum of daily life situations. Our hypothesis is that in order to make these attributions, people extract the regular elements (those which covary and those wich do not covary) in the given cases, and they ascribe a degree of plausibility to the constituted hypotheses given a limited set of contextual informations. An analysis of john stuart mill's system of logic (1843 1988) has provided the basis for the definition of a system of pragmatic schemas of inductive and deductive inferences formalized by several conditional rules. The input of these rules is fully developed by the extraction process that underlies the hypothesis generation and by four types of context ual informations : (i) the exhaustivity of data, (ii) the nature, simple or complex, of the relations between antecedent and consequent elements, (iii) the unicity versus multiplicity of antecedents and consequents, and (iv) the reliability of the datas. The output of the rules is a degree of plausibility attached to the generated hypothesis. In order to test the pragmatic schemas of inference model, four experiments have been conducted to discriminate the effects of the input variables
Claveau, Vincent. "Acquisition automatique de lexiques sémantiques pour la recherche d'information." Phd thesis, Université Rennes 1, 2003. http://tel.archives-ouvertes.fr/tel-00524646.
Full textSerban, Cristina. "Raisonnement automatisé pour la logique de séparation avec des définitions inductives." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAM030/document.
Full textThe main contribution of this thesis is a sound and complete proof system for entailments between inductive predicates, which are frequently encountered when verifying programs that work with dynamically allocated recursive data structures. We introduce a generalized proof system for first-order logic, and then adapt it to separation logic, a framework that addresses many of the difficulties posed by reasoning about dynamically allocated heaps. Soundness and completeness are ensured through four semantic restrictions and we also propose a proof-search semi-algorithm that becomes a decision procedure for the entailment problem when the semantic restrictions hold.This higher-order reasoning about entailments requires first-order decision procedures for the underlying logic when applying inference rules and during proof search. Thus, we provide two decision procedures for separation logic, considering the quantifier-free and the Exists*Forall*-quantified fragments, which were integrated in the open-source, DPLL(T)-based SMT solver CVC4.Finally, we also give an implementation of our proof system for separation logic, which uses these decision procedures. Given some inductive predicate definitions and an entailment query as input, a warning is issued when one or more semantic restrictions are violated. If the entailment is found to be valid, the output is a proof. Otherwise, one or more counterexamples are provided
Martienne, Emmanuelle. "Eagle : Un système pour la découverte interactive de descriptions de concepts basé sur la théorie des ensembles approximatifs." Nantes, 1999. http://www.theses.fr/1999NANT2007.
Full textCraciunescu, Sorin. "Preuves d'équivalence de programmes logiques." Palaiseau, Ecole polytechnique, 2004. http://www.theses.fr/2004EPXX0008.
Full textLöbach, Brigitte. "Semantikerwerb : ein Beitrag zu einer empiritisch-naturalistischen Bedeutungstheorie /." Tübingen : M. Niemeyer, 2000. http://catalogue.bnf.fr/ark:/12148/cb399180965.
Full textJacquemin, Ingrid Nicolas Jacques. "Découverte de motifs relationnels en bioinformatique application à la prédiction de ponts disulfures /." [S.l.] : [s.n.], 2005. ftp://ftp.irisa.fr/techreports/theses/2005/jacquemin.pdf.
Full textHelft, Nicolas. "L' Induction en intelligence artificielle : théorie et algorithmes." Aix-Marseille 2, 1988. http://www.theses.fr/1988AIX22044.
Full textBessant, Brigitte. "Contributions aux techniques de révision de croyances en intelligence artificielle : aspects sémantiques et calculatoires." Artois, 1999. http://www.theses.fr/1999ARTO0402.
Full textLopes, Marcos. "Modèles inductifs de la sémiotique textuelle." Paris 10, 2002. http://www.theses.fr/2002PA100145.
Full textClairambault, Pierre. "Logique et Interaction : une Étude Sémantique de la Totalité." Phd thesis, Université Paris-Diderot - Paris VII, 2010. http://tel.archives-ouvertes.fr/tel-00459307.
Full textJappy, Pascal. "Apprenabilité de classes de concepts structurés." Montpellier 2, 1997. http://www.theses.fr/1997MON20256.
Full textCraciunescu, Sorin. "Vérification des programmes logiques." Phd thesis, Ecole Polytechnique X, 2004. http://pastel.archives-ouvertes.fr/pastel-00000864.
Full textPolge, Martial. "La première hypothèse d'un raisonnement hypothético-déductif : approche comportementale et électrophysiologique du cas "+2" dans le problème "2-4-6"." Aix-Marseille 1, 2000. http://www.theses.fr/2001AIX10004.
Full textBoughattas, Sedki. "L'Arithmétique ouverte et ses modèles non-standards." Paris 7, 1987. http://www.theses.fr/1987PA077044.
Full textMbame, Nazaire. "Relations partie-tout : aspects ontologiques, phénoménologiques et lexico-sémantiques." Clermont-Ferrand 2, 2006. http://www.theses.fr/2006CLF20009.
Full textCrémilleux, Bruno Robert Claudine. "Induction automatique aspects théoriques, le système ARBRE, applications en médecine /." S.l. : Université Grenoble 1, 2008. http://tel.archives-ouvertes.fr/tel-00339492.
Full textBoukhris, Samir. "Probabilités et induction : le programme de Carnap." Paris 1, 2001. http://www.theses.fr/2001PA010601.
Full textRousseaux-Bettache, Nabila Amel. "Approche physiologique de la production de protéines recombinantes dans une logique globale haut débit." Paris 11, 2006. http://www.theses.fr/2006PA112071.
Full textBen, Rajeb Narjes. "Preuves par induction implicite : cas des théories associatives-commutatives et observationnelles." Nancy 1, 1997. http://www.theses.fr/1997NAN10174.
Full textAutomated induction proofs are a formal means for systems validation. In the framework of test set induction, we propose two automated proofs methods for conditional specifications: one deals with associative-commutative (AC) theories, the other with observational theories. In the first method, we give an algorithm for computing induction schemes, as well as a new inference system using elaborated AC rewriting techniques. For a class of specifications, the method detects non valid conjectures in a finite time. Interesting experiments on the correctness of digital circuits produced proofs requiring less interaction than other well-known provers. In the observational approach, data type objects are cnsidered as equal if they cannot be distinguished by experiments with observational results. These experiments are represented by particular terms called observable contexts. We propose an automated proof method of observational properties, relying on the computation of a finite set of well-chosen contexts called test contexts, that shematizes all the observable contexts. We also propose methods for computing such test contexts and a new inference system. For an interesting class of specifications, the method detects non observationally valid conjectures in a finite time
Larde, Christophe. "Étude expérimentale du comportement des circuits intégrés logiques soumis à des perturbations électromagnétiques." Lille 1, 1991. http://www.theses.fr/1991LIL10121.
Full textCorbineau, Pierre. "Démonstration automatique en théorie des types." Paris 11, 2005. http://www.theses.fr/2005PA112149.
Full textAmong software designed to help formal reasoning, there are automated theorem provers and interactive proof assistants. The former are specialized tools using technics that differ from traditionnal reasoning methods, but they have a very limited range. The latter have a wider range but theii users must specify explicitly every proof step. Automation of proofs is tricky in these latter tools because they use expressive logical systems. This thesis is build around three contributions in this field. First, we present an extension of congruence-closure the a theory of constructors with partial application. An algorithm to solve this problem is described and studied. Then, we build a first-order formalism including connectives defined as non-recursive inductive types similar to those in the Calculus of Inductive Constructions. We present a new contraction-free sequent calculus for first-order intuitionistic logic that is adapted to this formalism, and we prove its fundamental properties: contraction- and cut-elimination. We derive a semi-decision procedure from these results. Those two contributions are implemented inside the Coq proof assistant; the third one is the description of a methode allowing the interpretation of first-order proof tree into Type Theory by computational reflection. This paradigm is applied to propositionnal logic and is used by a decision procedure inside the Coq system. This method is also adapted to first-order logic with equality and allows to check proofs obtained by ordered completion in the CiME system
Hermann, Odile. "Mécanisation de la recherche de preuves et de programmes en arithmétique fonctionnelle du second ordre." Nancy 1, 1995. http://www.theses.fr/1995NAN10054.
Full textBoutillier, Pierre. "De nouveaux outils pour calculer avec des inductifs en Coq." Phd thesis, Université Paris-Diderot - Paris VII, 2014. http://tel.archives-ouvertes.fr/tel-01054723.
Full textFissore, Olivier. "Terminaison de la réécriture sous stratégies." Nancy 1, 2003. http://www.theses.fr/2003NAN10176.
Full textThe aim of this thesis is to study and develop tools for proving termination of rule-based languages using strategies. Starting from an original method for proving, by induction, the termination of innermost rewriting, we enhanced and extended this method to the outermost and local strategies. These proof processes have then been implemented in a tool, named CARIBOO. Such languages as ELAN make it possible for the programmer to define his own strategies, by combining rules of the program with appropriate strategy operators. We came up with a method allowing to prove termination of such strategies, based on an automatic simplification process. Finally, our original inductive proof process has been adapted to show weak termination of programs. This new process provides both the proof of termination of at least one evaluation of any data and an evaluation algorithm for this data
Urso, Pascal. "Généralisations et méthodes correctes pour l'induction mathématique." Phd thesis, Université de Nice Sophia-Antipolis, 2002. http://tel.archives-ouvertes.fr/tel-00505928.
Full textWang, Feng. "Abstraction temporelle de signal ECG, apprentissage inductif de contraintes temporelles et reconnaissance des arythmies cardiaques." Rennes 1, 2002. http://www.theses.fr/2002REN10123.
Full textLabarère, José. "Développement ascendant de recommandations pour la pratique clinique en situation d'incertitude scientifque : apport des arbres d'induction et application à la prévention de la maladie thrombo-embolique veineuse." Université Joseph Fourier (Grenoble), 2003. http://www.theses.fr/2003GRE19012.
Full textClinical practice guidelines are systematically developed statements to assist practitioner decisions about appropriate health care for specific clinical circumstances. When robust scientific evidence is lacking, clinical guidelines are derived from expert opinion. This leads to inconsistent guidelines which vary in their advice. This thesis reports the implementation of an ascending method of guideline development based on observational data in the case of prevention for venous thromboembolism. This method reduces the scientific uncertainty by extracting clinical decision rules from physician practice data. For this purpose, we used classification and regression tree methods. The accuracy of the clinical decision rules was illustrated by the rate of an outcome measure in the corresponding subsets of patients. This method reduces expert subjectivity in the process of development and increases the expected validity of the guidelines. Finally, we have demonstrated the impact of these guidelines on both physician practices and deep vein thrombosis, through a before-and-after study design