Search results for "discrete [space-time]"

showing 10 items of 2035 documents

Quantization of Poisson Lie Groups and Applications

1996

LetG be a connected Poisson-Lie group. We discuss aspects of the question of Drinfel'd:can G be quantized? and give some answers. WhenG is semisimple (a case where the answer isyes), we introduce quantizable Poisson subalgebras ofC ∞(G), related to harmonic analysis onG; they are a generalization of F.R.T. models of quantum groups, and provide new examples of quantized Poisson algebras.

58B30Pure mathematicsGeneralizationPoisson distribution01 natural sciencesHarmonic analysissymbols.namesakeQuantization (physics)58F060103 physical sciences0101 mathematicsQuantumMathematical PhysicsComputingMilieux_MISCELLANEOUSMathematicsPoisson algebraDiscrete mathematics[MATH.MATH-RT]Mathematics [math]/Representation Theory [math.RT]Group (mathematics)010102 general mathematicsLie groupStatistical and Nonlinear Physics81S1017B37[ MATH.MATH-RT ] Mathematics [math]/Representation Theory [math.RT]symbols010307 mathematical physics16W30
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Patients' and physicians' preferences for type 2 diabetes mellitus treatments in Spain and Portugal: a discrete choice experiment.

2015

Objective: To assess Spanish and Portuguese patients' and physicians' preferences regarding type 2 diabetes mellitus (T2DM) treatments and the monthly willingness to pay (WTP) to gain benefits or avoid side effects. Methods: An observational, multicenter, exploratory study focused on routine clinical practice in Spain and Portugal. Physicians were recruited from multiple hospitals and outpatient clinics, while patients were recruited from eleven centers operating in the public health care system in different autonomous communities in Spain and Portugal. Preferences were measured via a discrete choice experiment by rating multiple T2DM medication attributes. Data were analyzed using the cond…

:Geographicals::Geographic Locations::Europe::Portugal [Medical Subject Headings]cardiovascular riskHbA1cendocrine system diseases:Analytical Diagnostic and Therapeutic Techniques and Equipment::Diagnosis::Diagnostic Techniques and Procedures::Physical Examination::Body Constitution::Body Weights and Measures::Body Mass Index [Medical Subject Headings]:Diseases::Nutritional and Metabolic Diseases::Metabolic Diseases::Glucose Metabolism Disorders::Hypoglycemia [Medical Subject Headings]:Disciplines and Occupations::Health Occupations::Medicine::Public Health [Medical Subject Headings]:Analytical Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Statistics as Topic::Probability::Risk::Risk Factors [Medical Subject Headings]:Organisms::Eukaryota::Animals::Chordata::Vertebrates::Mammals::Primates::Haplorhini::Catarrhini::Hominidae::Humans [Medical Subject Headings]:Named Groups::Persons::Occupational Groups::Health Personnel::Physicians [Medical Subject Headings]HbA(1c)HbA:Diseases::Pathological Conditions Signs and Symptoms::Signs and Symptoms::Body Weight::Body Weight Changes::Weight Loss [Medical Subject Headings]:Diseases::Cardiovascular Diseases [Medical Subject Headings]preferences:Geographicals::Geographic Locations::Europe::Spain [Medical Subject Headings]diabetesnutritional and metabolic diseasesPeso corporalweightPérdida de peso:Health Care::Health Care Facilities Manpower and Services::Health Facilities::Ambulatory Care Facilities [Medical Subject Headings]Diabetes mellitus tipo 2:Diseases::Pathological Conditions Signs and Symptoms::Signs and Symptoms::Signs and Symptoms Digestive::Nausea [Medical Subject Headings]hypoglycemia:Analytical Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Statistics as Topic::Models Statistical::Logistic Models [Medical Subject Headings]:Diseases::Pathological Conditions Signs and Symptoms::Signs and Symptoms::Body Weight [Medical Subject Headings]:Diseases::Nutritional and Metabolic Diseases::Metabolic Diseases::Glucose Metabolism Disorders::Diabetes Mellitus::Diabetes Mellitus Type 2 [Medical Subject Headings]:Chemicals and Drugs::Chemical Actions and Uses::Pharmacologic Actions::Physiological Effects of Drugs::Hypoglycemic Agents [Medical Subject Headings]Enfermedades cardiovascularesHipoglucemiawillingness to pay:Check Tags [Medical Subject Headings]discrete choice model
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Adaptive synchronization of master-slave systems with mixed neutral and discrete time-delays and nonlinear perturbations

2011

This paper investigates the delay-dependent adaptive synchronization problem of the master and slave structure of linear systems with both constant neutral and time-varying discrete time-delays and nonlinear perturbations based on the Barbalat lemma and matching conditions. An adaption law which includes the master-slave parameters is obtained by using the Lyapunov functional method and inequality techniques to synchronize the master-slave systems without the knowledge of upper bounds of perturbation terms. Particularly, it is shown that the synchronization speed can be controlled by adjusting the update gain of the synchronization signal. A numerical example has been given to show the effe…

:Informàtica::Automàtica i control [Àrees temàtiques de la UPC]Automatic controlPertorbació (Matemàtica)Synchronization of chaosLinear systemMaster-slave systemsNonlinear perturbationsPerturbation (astronomy)Master/slaveNonlinear perturbationsSynchronizationAdaptive synchronizationDiscrete time and continuous timeControl and Systems EngineeringControl theorySincronitzacióMathematicsAsian Journal of Control
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On the arithmetic and geometry of binary Hamiltonian forms

2011

Given an indefinite binary quaternionic Hermitian form $f$ with coefficients in a maximal order of a definite quaternion algebra over $\mathbb Q$, we give a precise asymptotic equivalent to the number of nonequivalent representations, satisfying some congruence properties, of the rational integers with absolute value at most $s$ by $f$, as $s$ tends to $+\infty$. We compute the volumes of hyperbolic 5-manifolds constructed by quaternions using Eisenstein series. In the Appendix, V. Emery computes these volumes using Prasad's general formula. We use hyperbolic geometry in dimension 5 to describe the reduction theory of both definite and indefinite binary quaternionic Hermitian forms.

AMS : 11E39 20G20 11R52 53A35 11N45 15A21 11F06 20H10representation of integersHyperbolic geometry20H10Geometry15A2101 natural sciencesHyperbolic volume[MATH.MATH-GR]Mathematics [math]/Group Theory [math.GR]11E39 20G20 11R52 53A35 11N45 15A21 11F06 20H10symbols.namesake11E390103 physical sciencesEisenstein seriesCongruence (manifolds)group of automorphs0101 mathematics20G20Quaternion11R52[MATH.MATH-GR] Mathematics [math]/Group Theory [math.GR]Mathematicsreduction theoryDiscrete mathematicsAlgebra and Number TheoryQuaternion algebraMathematics - Number TheorySesquilinear formta111010102 general mathematicsHamilton-Bianchi groupHermitian matrix53A35[MATH.MATH-NT]Mathematics [math]/Number Theory [math.NT]11F06[MATH.MATH-DG]Mathematics [math]/Differential Geometry [math.DG]symbols010307 mathematical physicsMathematics::Differential Geometry[MATH.MATH-DG] Mathematics [math]/Differential Geometry [math.DG]Hamilton–Bianchi group11N45binary Hamiltonian formhyperbolic volume[MATH.MATH-NT] Mathematics [math]/Number Theory [math.NT]
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A note on higher order Melnikov functions

2005

We present several classes of planar polynomial Hamilton systems and their polynomial perturbations leading to vanishing of the first Melnikov integral. We discuss the form of higher order Melnikov integrals. In particular, we present new examples where the second order Melnikov integral is not an Abelian integral.

Abelian integralPolynomialPure mathematicsMathematics::Dynamical SystemsApplied MathematicsMathematical analysisMathematics::Classical Analysis and ODEsPhysics::Fluid DynamicsNonlinear Sciences::Chaotic DynamicsPlanarDiscrete Mathematics and CombinatoricsOrder (group theory)Nonlinear Sciences::Pattern Formation and SolitonsMathematicsQualitative Theory of Dynamical Systems
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Automorphisms of hyperelliptic GAG-codes

2009

Abstract We determine the n –automorphism group of generalized algebraic-geometry codes associated with rational, elliptic and hyperelliptic function fields. Such group is, up to isomorphism, a subgroup of the automorphism group of the underlying function field.

Abelian varietyDiscrete mathematicsautomorphismsGroup (mathematics)Applied Mathematicsgeneralized algebraic geometry codes.Outer automorphism groupReductive groupAutomorphismTheoretical Computer ScienceCombinatoricsMathematics::Group Theorygeometric Goppa codeAlgebraic groupDiscrete Mathematics and Combinatoricsalgebraic function fieldsSettore MAT/03 - GeometriaIsomorphismfinite fieldsGeometric Goppa codesfinite fieldalgebraic function fieldHyperelliptic curvegeneralized algebraic-geometry codesMathematicsDiscrete Mathematics
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Instantaneous transfer entropy for the study of cardio-respiratory dynamics

2015

Measures of transfer entropy have been proposed to quantify the directional coupling and strength between two complex physiological variables. Particular attention has been given to nonlinear interactions within cardiovascular and respiratory dynamics as influenced by the autonomic nervous system. However, standard transfer entropy estimates have shown major limitations in dealing with issues concerning stochastic system modeling, limited observations in time, and the assumption of stationarity of the considered physiological variables. Moreover, standard estimates are unable to track time-varying changes in nonlinear coupling with high resolution in time. Here, we propose a novel definitio…

AdultMaleInformation transferComputer scienceEntropyPostureBiomedical EngineeringProbability density functionHealth InformaticsMaximum entropy spectral estimationNonlinear DynamicEntropy (classical thermodynamics)ElectrocardiographyTheoreticalRespiratory RateControl theoryModelsHeart RateTilt-Table TestEntropy (information theory)Humans1707; Signal Processing; Biomedical Engineering; Health InformaticsStatistical physicsEntropy (energy dispersal)Entropy (arrow of time)1707Likelihood FunctionsEntropy (statistical thermodynamics)Models TheoreticalLikelihood FunctionNonlinear systemDiscrete time and continuous timeNonlinear DynamicsSignal ProcessingSettore ING-INF/06 - Bioingegneria Elettronica E InformaticaTransfer entropyFemaleAdult; Electrocardiography; Entropy; Female; Heart Rate; Humans; Likelihood Functions; Male; Models Theoretical; Nonlinear Dynamics; Posture; Tilt-Table Test; Respiratory Rate; Signal Processing; Biomedical Engineering; 1707; Health InformaticsEntropy (order and disorder)Human
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Instantaneous Transfer Entropy for the Study of Cardiovascular and Cardio-Respiratory Nonstationary Dynamics

2017

Objective: Measures of transfer entropy (TE) quantify the direction and strength of coupling between two complex systems. Standard approaches assume stationarity of the observations, and therefore are unable to track time-varying changes in nonlinear information transfer with high temporal resolution. In this study, we aim to define and validate novel instantaneous measures of TE to provide an improved assessment of complex nonstationary cardiorespiratory interactions. Methods: We here propose a novel instantaneous point-process TE (ipTE) and validate its assessment as applied to cardiovascular and cardiorespiratory dynamics. In particular, heartbeat and respiratory dynamics are characteriz…

AdultMaleInformation transferHistoryHeartbeatDatabases FactualPhysiologyEntropy0206 medical engineeringComplex systemBiomedical EngineeringHeart Rate VariabilityProbability density function02 engineering and technology01 natural sciencesPoint processStatistics NonparametricElectrocardiographyYoung Adult0103 physical sciencesProbability density functionEntropy (information theory)HumansStatistical physicsTransfer Entropy010306 general physicsBiomedical measurementMathematicsbusiness.industryHemodynamicsModels CardiovascularHeart beatSignal Processing Computer-AssistedComplexityBaroreflex020601 biomedical engineeringKolmogorov-Smirnov DistanceRespiratory Sinus ArrhythmiaBaroreflex; Biomedical measurement; Complexity; Entropy; Heart beat; Heart rate variability; Heart Rate Variability; History; Kolmogorov-Smirnov Distance; Physiology; Point Process; Probability density function; Respiratory Sinus Arrhythmia; Transfer Entropy; Biomedical EngineeringDiscrete time and continuous timePoint ProceSettore ING-INF/06 - Bioingegneria Elettronica E InformaticaPoint ProcessTransfer entropyFemaleArtificial intelligencebusiness
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A discrete-choice experiment to assess patients’ preferences for osteoarthritis treatment: An ESCEO working group

2020

Objective: To evaluate the preferences of patients with osteoarthritis for treatment.Methods: A discrete-choice experiment was conducted among adult OA patients who were presented with 12 choice sets of two treatment options and asked in each to select the treatment they would prefer. Based on literature reviews, expert consultation, patient survey and expert meeting, treatment options were characterized by seven attributes: improvement in pain, improvement in walking, ability to manage domestic activities, ability to manage social activities, improvement in overall energy and well-being, risk of moderate/severe side effects and impact on disease progression. Random parameters logit model w…

AdultMalemedicine.medical_specialtyDiscrete choice experimentOsteoarthritisOutcomes03 medical and health sciences0302 clinical medicinePHYSICIANSRheumatologySurveys and QuestionnairesOsteoarthritisMedicineHumans030212 general & internal medicineAgedOutcome030203 arthritis & rheumatologyddc:616HIPbusiness.industryDisease progressionDiscrete-choice experimentTreatment optionsPatient PreferencePatient preferencesmedicine.diseaseLatent class modelPreferenceEuropeInstitutional repositoryAnesthesiology and Pain MedicineLogistic ModelsPhysical therapyPatient surveyFemaleKNEEOsteoarthritiHEALTHbusiness
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Darstellung von Hyperebenen in verallgemeinerten affinen Räumen durch Moduln

1994

The starting point of this article is a generalized concept of affine space which includes all affine spaces over unitary modules. Our main result is a representation theorem for hyperplanes of affine spaces: Every hyperplane which satisfies a weak richness condition is induced by a module. 1

Affine coordinate systemDiscrete mathematicsAffine geometryPure mathematicsMathematics (miscellaneous)Affine representationComplex spaceHyperplaneApplied MathematicsAffine hullAffine groupAffine spaceMathematicsResults in Mathematics
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