Search results for "Computer Science Application"

showing 10 items of 3998 documents

Excision technique in constrained formulations of Einstein equations: collapse scenario

2015

We present a new excision technique used in constrained formulations of Einstein equations to deal with black hole in numerical simulations. We show the applicability of this scheme in several scenarios. In particular, we present the dynamical evolution of the collapse of a neutron star to a black hole, using the CoCoNuT code and this excision technique.

Black holePhysicsGeneral Relativity and Quantum CosmologyHistoryNeutron starCode (set theory)Classical mechanicsAstrophysics::High Energy Astrophysical PhenomenaEinstein equationsCollapse (topology)Computer Science ApplicationsEducationJournal of Physics: Conference Series
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Internet-based learning environments for project-enhanced science learning

2002

Blended learningPedagogyEducational technologyCollaborative learningOpen learningPersonalized learningPsychologyExperiential learningLearning sciencesComputer Science ApplicationsEducationSynchronous learningJournal of Computer Assisted Learning
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Iterative sparse matrix-vector multiplication for accelerating the block Wiedemann algorithm over GF(2) on multi-graphics processing unit systems

2012

SUMMARY The block Wiedemann (BW) algorithm is frequently used to solve sparse linear systems over GF(2). Iterative sparse matrix–vector multiplication is the most time-consuming operation. The necessity to accelerate this step is motivated by the application of BW to very large matrices used in the linear algebra step of the number field sieve (NFS) for integer factorization. In this paper, we derive an efficient CUDA implementation of this operation by using a newly designed hybrid sparse matrix format. This leads to speedups between 4 and 8 on a single graphics processing unit (GPU) for a number of tested NFS matrices compared with an optimized multicore implementation. We further present…

Block Wiedemann algorithmComputer Networks and CommunicationsComputer scienceGraphics processing unitSparse matrix-vector multiplicationGPU clusterParallel computingGF(2)Computer Science ApplicationsTheoretical Computer ScienceGeneral number field sieveMatrix (mathematics)Computational Theory and MathematicsFactorizationLinear algebraMultiplicationComputer Science::Operating SystemsSoftwareInteger factorizationSparse matrixConcurrency and Computation: Practice and Experience
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On the Statistical Properties of Capacity Outage Intervals in OSTBC-MIMO Rayleigh Fading Channels

2016

This paper deals mainly with the study of the asymptotic probability density functions (PDFs) of the outage durations of the instantaneous capacity of orthogonal space-time block code (OSTBC) multiple-input multiple-output (MIMO) systems over Rayleigh channels. Drawing upon known statistical properties for the asymptotic behavior of chi-squared processes at low levels, we provide approximate solutions for the PDF, the cumulative distribution function (CDF), and the $k$ th-order moments of the outage intervals of the underlying capacity processes. Then, as an application of the derived PDF, the performance assessment of capacity simulators is reported. Following this, we introduce the newly …

Block codeAsymptotic analysisStochastic processApplied MathematicsCumulative distribution functionMIMO020302 automobile design & engineering020206 networking & telecommunicationsProbability density function02 engineering and technologyComputer Science ApplicationsChannel capacity0203 mechanical engineeringStatistics0202 electrical engineering electronic engineering information engineeringApplied mathematicsElectrical and Electronic EngineeringComputer Science::Information TheoryRayleigh fadingMathematicsIEEE Transactions on Wireless Communications
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Design of efficient codes for the AWGN channel based on decomposable binary lattices

1998

This work is concerned with the use of binary decomposable lattice codes over the QAM Gaussian channel. First, we investigate the structure of such class of lattices: we derive consistency conditions for the binary codes appearing in their decomposition and express their nominal coding gain and some bounds for their error coefficient in terms of the parameters of the component codes. Then we describe a general multistage bounded‐distance decoding algorithm with low complexity and we evaluate its performance. Finally, we develop a design example and report the corresponding simulation results; as a reference some comparisons with standard TCM codes are also presented.

Block codeTheoretical computer scienceApplied MathematicsConcatenated error correction codeBinary numberLinear codeCoding gainComputer Science Applicationssymbols.namesakeAdditive white Gaussian noiseComputational Theory and MathematicssymbolsBinary codeElectrical and Electronic EngineeringAlgorithmDecoding methodsMathematics
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The influence of different generations of computer algorithms on diabetes control

1990

With all control schedules, the management of diabetes is possible using Skyler's algorithm. In general, those control algorithms which do not allow the individual adaptation to changing conditions lead to overinsulinisation. So-called meal-related algorithms do usually minimise the fluctuations in blood sugar. The introduction of self-adapting algorithms, detecting peripheral insulin resistance, may further improve metabolic diabetes control.

Blood GlucoseControl algorithmbusiness.industryControl (management)Blood sugarHealth InformaticsPeripheral insulin resistancemedicine.diseaseDrug Administration ScheduleComputer Science ApplicationsEatingDiabetes controlTherapy Computer-AssistedDiabetes mellitusDiabetes MellitusmedicineHumansInsulinProspective StudiesAdaptation (computer science)businessAlgorithmAlgorithmsSoftwareRetrospective StudiesComputer Methods and Programs in Biomedicine
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Incretin Response to Mixed Meal Challenge in Active Cushing’s Disease and after Pasireotide Therapy

2022

Cushing’s disease (CD) causes diabetes mellitus (DM) through different mechanisms in a significant proportion of patients. Glucose metabolism has rarely been assessed with appropriate testing in CD; we aimed to evaluate hormonal response to a mixed meal tolerance test (MMTT) in CD patients and analyzed the effect of pasireotide (PAS) on glucose homeostasis. To assess gastro-entero-pancreatic hormones response in diabetic (DM+) and non-diabetic (DM–) patients, 26 patients with CD underwent an MMTT. Ten patients were submitted to a second MMTT after two months of PAS 600 µg twice daily. The DM+ group had significantly higher BMI, waist circumference, glycemia, HbA1c, ACTH le…

Blood GlucoseCushing’s disease; diabetes mellitus; incretin; mixed meal test tolerance test; pasireotidemixed meal test tolerance testGastric Inhibitory PolypeptideIncretinsCatalysisInorganic ChemistryGlucagon-Like Peptide 1HumansInsulinPhysical and Theoretical ChemistryPituitary ACTH HypersecretionMolecular BiologyMealsSpectroscopyGlycated HemoglobinpasireotideC-Peptidediabetes mellituOrganic Chemistrydigestive oral and skin physiologyGeneral MedicineCushing’s diseaseGlucagonincretinComputer Science ApplicationsDiabetes Mellitus Type 2Cushing’s disease; mixed meal test tolerance test; diabetes mellitus; incretin; pasireotidediabetes mellituspasireotide.Insulin ResistanceSomatostatinhormones hormone substitutes and hormone antagonists
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EVOO's Effects on Incretin Production: Is There a Rationale for a Combination in T2DM Therapy?

2022

Type 2 diabetes mellitus (T2DM) is a serious public health concern as it is one of the most common chronic diseases worldwide due to social and economic developments that have led to unhealthy lifestyles, with a considerable impact both in terms of morbidity and mortality. The management of T2DM, before starting specific therapies, includes cornerstones such as healthy eating, regular exercise and weight loss. Strict adherence to the Mediterranean diet (MedDiet) has been related to an inverse association with the risk of T2DM onset, as well as an improvement in glycaemic control; in particular, thanks to the consumption of extra virgin olive oil (EVOO). Agonists of gut-derived glucagon-like…

Blood GlucoseDipeptidyl-Peptidase IV InhibitorsHypoglycemic Agent[SDV]Life Sciences [q-bio]Organic ChemistryEVOOT2DMGeneral MedicineIncretinIncretinsCatalysisComputer Science ApplicationsInorganic ChemistryDiabetes Mellitus Type 2Glucagon-Like Peptide 1Insulin SecretionHumansHypoglycemic AgentsMedDietPhysical and Theoretical ChemistryGLP-1Molecular BiologySpectroscopyHuman
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A multicompartment model for open-loop control of glucose in insulin-dependent diabetics

1990

This paper describes a model that has been developed for individually adjusted therapy management in insulin-dependent diabetics. The multicompartment model considers all relevant aspects of glucose kinetics and its dependence on insulin. The structure of the model reflects that of the physiological system. Its parameters can be classified into (a) general parameters that are independent of the individual, (b) classifying parameters that are related systematically to the individual, and (c) distinguishing parameters. Classifying parameters allow a very convenient adjustment to relevant features of the individual like sex, age, body weight and length. The model can be employed in open-loop c…

Blood GlucoseFood intakeInsulinmedicine.medical_treatmentOpen-loop controllerHealth InformaticsPhysical exerciseBody weightModels BiologicalComputer Science ApplicationsTherapy managementDiabetes Mellitus Type 1Body CompositionmedicineHumansGlucose kineticsBiological systemInsulin dependentSoftwareSimulationMathematicsComputer Methods and Programs in Biomedicine
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Real-time estimation of plasma insulin concentration from continuous glucose monitor measurements

2015

Continuous glucose monitors can measure interstitial glucose concentration in real time for closed-loop glucose control systems, known as artificial pancreas. These control systems use an insulin feedback to maintain plasma glucose concentration within a narrow and safe range, and thus to avoid health complications. As it is not possible to measure plasma insulin concentration in real time, insulin models have been used in literature to estimate them. Nevertheless, the significant interand intra-patient variability of insulin absorption jeopardizes the accuracy of these estimations. In order to reduce these limitations, our objective is to perform a real-time estimation of plasma insulin co…

Blood GlucoseMaleInsulin pump0209 industrial biotechnologymedicine.medical_treatmentBiomedical EngineeringArtificial pancreas030209 endocrinology & metabolismBioengineering02 engineering and technologyArtificial pancreas03 medical and health sciencesExtended Kalman filter020901 industrial engineering & automation0302 clinical medicineComputer SystemsTime estimationmedicineHumansInsulinComputer SimulationObservabilityMathematicsType 1 diabetesBlood Glucose Self-MonitoringInsulinReproducibility of ResultsGlucose insulin modelsGeneral MedicineMiddle AgedModels Theoreticalmedicine.diseaseINGENIERIA DE SISTEMAS Y AUTOMATICAExtended Kalman filterComputer Science ApplicationsHuman-Computer InteractionDiabetes Mellitus Type 1Type 1 diabetesFemalePlasma insulinMATEMATICA APLICADAAlgorithmsInsulin estimationBiomedical engineeringComputer Methods in Biomechanics and Biomedical Engineering
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