yusuke1997/dblp-id-title huggingface dataset:
Pulse Oximetry Markers for Cardiovascular Disease in Sleep Apnea
Effects of Interpolation on the Inverse Problem of Electrocardiography
Identification of ECG Signal Pattern Changes to Reduce the Incidence of Ventricular Tachycardia False Alarms
Elements Read GUI: a Versatile Tool to Display and Analyse Electrophysiological Experimental Data
Quantitative Comparison of Two Cardiac Electrical Imaging Methods to Localize Pacing Sites
Impact of baseline drift removal on ECG beat classification and alignment
A Convolutional Neural Network-based Deformable Image Registration Method for Cardiac Motion Estimation from Cine Cardiac MR Images
Heart Rate Variability Associated with Different Modes of Respiration during Zen Meditation
Inducibility of Atrial Fibrillation Depends Chaotically on Ionic Model Parameters
Increase of QRS Duration as a Predictor of Impending Ventricular Fibrillation during Coronary Artery Occlusion
Normal Ventricular Repolarization Dispersion Range with Abrupt Heart Rate Changes
Predicting Neurological Recovery from Coma After Cardiac Arrest: The George B. Moody PhysioNet Challenge 2023
Left Atrial Appendage Morphology Impacts Thrombus Formation Risks in Multi-Physics Atrial Models
Noninvasive Electrocardiographic Imaging with Magnetic Resonance Tomography in Candidates for Cardiac Resynchronization Therapy
False Alarm Reduction in Atrial Fibrillation Screening
Cuffless Hypertension Risk Assessment and the Significance of Calibration
Model Ensembling for Predicting Neurological Recovery After Cardiac Arrest: Top-Down or Bottom-Up?
Automatic Sleep Arousal Detection Using Heart Rate From a Single-Lead Electrocardiogram
Variability of the Maximal Amplitudes of Impedance Cardiogram and of its First Derivative during Supine, Standing, Paced Breathing, and Exercise Maneuvers
Electrogram Coupling as a Measure of Local Conduction during Atrial Fibrillation
Noncontact Sensing of Electrocardiographic Potential and Body Proximity by In-bed Conductive Fabrics
A Novel Mapping Strategy of Repetitive Patterns in Consecutive Recordings to Localize Atrial Fibrillation Sources: an In-Silico Study
Parsing HL7 aECG Files and Segmenting Leads for Interactive Progressive-based Interpretation of the 12-Lead Electrocardiogram
HRV Spectral and Fractal Analysis in Heart Failure Patients with Different Aetiologies
An Optimization Approach to EEG Feature Extraction for the Prediction of Neurological Outcome
Versatile Detector of Pseudo Periodic Patterns
Cardiac-gated Slit Lamp Videography as a Novel Approach to Assessing a Microcirculatory Network
Noninvasive Fetal QRS Detection using a Linear Combination of Abdomen ECG Signals
Computing in Cardiology, CinC 2015, Nice, France, September 6-9, 2015
Phase-Rectified Signal Averaging for Automatic Detection of QRS Fragmentation
PhysioZoo ECG: Digital electrocardiography biomarkers to assess cardiac conduction
A New Computer-Aided Solution for the Automatic Detection of Metal Stent Struts in Follow-up Evaluation in OCT Images
ECGlib: Library for Processing Electrocardiograms
Fusion of Edge Enhancing Algorithms for Atherosclerotic Carotid Wall Contour Detection in Computed Tomography Angiography
Development of an Early Warning System for Sepsis
Changes in Instantaneous Complex Dynamics during Exercise in Chronic Mountain Sickness
Index of T-wave Variation as a Predictor of Sudden Cardiac Death in Chronic Heart Failure Patients with Atrial Fibrillation
Quantitative Evaluation of Myocardial Ischemia by Cardiac Magnetic Resonance Imaging
Optimizing Atrial Electrogram Classification Based on Local Ablation Outcome in Human Atrial Fibrillation
Weakly Supervised Deformation Network for 3D Echocardiography Segmentation on Left Ventricle
Classification of Fetal Behavioral States by Using 1D-CNN Based on Fetal Electrocardiography
QRS Detectors Performance Comparison in Public Databases
The Frequency Changes in Electrograms During Ischemia Experiments - Analysis by Matching Pursuit Decomposition
Automated Quiet Sleep Detection for Premature Newborns Based on Video and ECG Analysis
Assessment of Dynamic Autonomic Changes with Posture using Instantaneous Entropy Measures
A Framework for Left Atrium Segmentation on CT Images with Combined Detection Network and Level Set Model
The Combination of Pulmonary Vein Electrophysiology and Atrial Fibrosis Determines Driver Location
Deep Learning Based Classification of True/False Arrhythmia Alarms in the Intensive Care Unit
Identification of Myocardial Scar in Ventricular Tachycardia: Correlation between CT based results and Electro-Anatomic Map Findings
New Indices for Sleep Apnea Detection in Long-Time ECG Recordings
Quantitative Assessment of Respiratory Distress Using Convolutional Neural Network for Multivariate Time Series Segmentation
Non-Invasive Electrophysiological Mapping Entropy Predicts Atrial Fibrillation Ablation Efficacy Better Than Clinical Characteristics
Efficiency of Different Heartbeat Detection Methods by Using Alternative Noise Reduction Algorithms
Effect of Stethoscope Position on Auscultatory Blood Pressure Measurement
New Mathematical Model of Electromechanical Coupling in Rat Cardiomyocytes
Atrial Fibrosis Distribution Generation Based on the Diffusion Models
Classification of Atrial Fibrillation Episodes by Means of Phase Variations of Time-Frequency Transforms
The Influence of Left Atrial Wall Thickness and Curvature on Wall Strain in Patient-Specific Atrium Models
Development of Fetal Heart Rate Dynamics before and after 30 and 35 Weeks of Gestation
The Differential Meaning of LV and LA Strains in Aortic Valve Stenosis: A Feature Tracking MRI Study
Evaluating the Risks of Arrhythmia through Big Data: Automatic Processing and Neural Networks to Classify Epicardial Electrograms
Raising High-Risk Awareness in Hemodynamic Treatment with Reinforcement Learning for Septic Shock Patients
Effect of Propranolol and Its Dosages on Maternal-Fetal Heart Rates Coupling in Pregnant Mice and Fetuses
Atrial Fibrillation Episode Patterns and Their Influence on Detection Performance
Abnormal Rhythm Detection from a Single-Lead ECG via a Recurrent Neural Network
AF Detection and ECG Classification based on Convolutional Recurrent Neural Network
A Noninvasive Cardiac Output Trend Monitor Targeting Telemedicine Applications
Sensitivity Study of Fiber Orientation on Stroke Volume in the Human Left Ventricle
A Deep Learning Model for Recognizing Pediatric Congenital Heart Diseases Using Phonocardiogram Signals
Hemodynamic Monitoring Using Switching Autoregressive Dynamics of Multivariate Vital Sign Time Series
Computationally Efficient Early Prognosis of the Outcome of Comatose Cardiac Arrest Survivors Using Slow-Wave Activity Features in EEG
Fetal Magnetic Resonance Image Denoising Based on Homogeneity Testing and Non Local Means
An Open-Source Algorithm for Standardized Bullseye Visualization of High-Resolution Cardiac Ventricular Data: UNISYS
Modelling and Simulation Reveals Density-Dependent Re-Entry Risk in The Infarcted Ventricles After Stem Cell-Derived Cardiomyocyte Delivery
Investigating the Response to Dofetilide with Symmetric Projection Attractor Reconstruction of the Electrocardiogram
Combined Action Potential- and Dynamic-Clamp for Accurate Computational Modeling of the Kinetics of Cardiac IKr Current
Morphologic Features of the ECG for Detection of Stress-Induced Ischemia
Multiple P-Wave Morphologies in Paroxysmal Atrial Fibrillation Patients During Sinus Rhythm: A Simulation Study
A Simple Algorithm for Ventilation Detection in the Capnography Signal During Cardiopulmonary Resuscitation
Complexity of Spontaneous QT Variability Unrelated to RR Variations and Respiration During Graded Orthostatic Challenge
Reliability of APD-Restitution Slope Measurement: Quantification and Methodological Comparison
Characterizing Dry Electrodes Impedance by Parametric Modeling for Arm Wearable Long-term Cardiac Rhythm Monitoring
Regional Conduction Velocity Calculation based on Local Activation Times: A Simulation Study on Clinical Geometries
Parameter Identification of a Cardiovascular Model for the Estimation of Ventricular Pressure on Aortic Stenosis
Fetal Heart Rate Pattern in Prenatal Diagnosis - Fetal Autonomic Brain Age Score
Knowledge extraction based on wavelets and DNN for classification of physiological signals: Arousals case
Age and Changes in Extracted Features of Lagged Poincare Plot
Extracting Myofibre Orientation from Micro-CT Images: An Optimisation Study
An HTML5-based ECG Viewer
Assessment of the Fibrotic Myocardial Tissue Mechanics by Image Processing
An Evaluation of Different Coating for TiN Microelectrode Chambers Used for Neonatal Cardiomyocytes
Long-term HRV in Critically Ill Pediatric Patients: Coma versus Brain Death
QRS Fragmentation Index as a New Discriminator for Early Diagnosis of Heart Diseases
Effects of Acetylcholine Release Spatial Distribution on the Frequency of Atrial Reentrant Circuits: a Computational Study
A Quaternion-based Approach to Estimate Respiratory Rate from the Vectorcardiogram
Use of Atrial Fibrillation Organization to Evaluate the Efficacy of Guided Ablation
Deep Learning System for Left Ventricular Assist Device Candidate Assessment from Electrocardiograms
Tailoring Process for the Regional Personalization of Atrial Fibrillation with a Novel Cardiac Model
Classification Atrial Fibrillation Using Stacked Autoencoders Neural Networks
Time-Padded Random Forest Ensemble to Capture Changes in Physiology Leading to Sepsis Development
The Effects of External Pressure on Multi-Wavelength Photoplethysmography Signals
Automatic Detection of Mitral Annulus in Echocardiography based on Prior Knowledge and Local Context
Towards the Development of an in Silico Model for the Zebrafish Action Potential
Propofol General Anesthesia Decreases the Coupling Strength Between Mean Arterial Blood Pressure and Mean Cerebral Blood Flow Velocity in Patients Undergoing Coronary Artery Bypass Grafting
Electrocardiographic Measurements of the QT Interval During Embryonic Development in Fertilized Chicken Eggs
Autonomic Nervous System Non-stationary Response to Hyperbaric Environments
A New Phase Space Analysis Algorithm for the Early Detection of Syncope during Head-Up Tilt Tests
An Embedding Approach for Biomarker Identification in Hypertrophic Cardiomyopathy
Robust Feature Extraction from Noisy ECG for Atrial Fibrillation Detection
A Robust, Simple and Reliable Measure of Heart Rate Variability using Relative RR Intervals
Effects of Density and Distribution of Non-Spontaneous Myocytes, Scars and Fibroblasts Inside the Human Sinoatrial Node
Automatic Detection of Characteristic Waves in Electrocardiogram
Detection of Congestive Heart Failure using Renyi Entropy
A Tensor Approach to Heart Sound Classification
Ventricular Conduction System Modeling for Electrophysiological Simulation of the Porcine Heart
A Novel Preprocessing Tool to Enhance ECG R-wave Extraction
Inverse Localization of the Latest-Activated Areas in the Ventricles from Body Surface Potential Maps
Post Extrasystolic T Wave Change in Subjects With Structural Healthy Ventricles - Measurement and Simulation
Optimizing the Reconstruction of Cardiac Potentials Using a Novel High Resolution Pericardiac Cage
ECG-Based Predictors of Sudden Cardiac Death in Chagas' Disease
A Deep Neural Network and Reconstructed Phase Space Approach to Classifying 12-lead ECGs
Optimizing the Short- and Long Term Regression for QRS Detection in Presence of Missing Data
Automatic Generation of Surface Meshes for Right Ventricle with 1-to-1 Vertex Correspondence from Cine-MR Images
Aortic Pulse Wave Velocity using Wavelet Analysis in Magnetic Resonance Imaging
How Accurately can Cardiac Conductivity Values be Determined from Heart Potential Measurements?
Detection of Short Supraventricular Tachycardias in Single-lead ECGs Recorded Using a Handheld Device
Experimental Validation of Image-Based Modeling of Torso Surface Potentials During Acute Myocardial Ischemia
Exaggerated Amplitude and Peak Location of Ta Wave in Tachycardia as an Indicator for Atrial Disorders
Online Tool for Dynamical Heart Rate Variability Analysis
Mobile App for the Digitization and Deep-Learning-Based Classification of Electrocardiogram Printed Records
A New Approach for Mapping Electrical Conduction in Ventricular Tachycardia
Predicting Mood Changes in Bipolar Disorder through Heartbeat Nonlinear Dynamics: a Preliminary Study
In Silico Characterization of Repolarization Duration and Variability in the Long QT1 Syndrome Under β-Adrenergic Stimulation
Uncoupling Between Heart Rate Variability and Heart Rate During Exercise and Recovery as a Predictor of Cardiovascular Events
A Two-Phase Multilabel ECG Classification Using One-Dimensional Convolutional Neural Network and Modified Labels
Analysis of Seismocardiogram Capability for Prediction of Mild to Moderate Hemorrhage: Preliminary Results
Electrocardiogram Monitoring and Interpretation: From Traditional Machine Learning to Deep Learning, and Their Combination
AF Classification from a Short Single Lead ECG Recording: the Physionet Computing in Cardiology Challenge 2017
A Computational Framework to Benchmark Basket Catheter Guided Ablation
Fusion Imaging of Computed Tomography and 3D Echocardiography: Combined Assessment of Coronary Anatomy and Myocardial Function
Breakthrough Wave Detection in a 3D Computer Model of Atrial Endo-Epicardial Dissociation
Controlling the Inspiration/Expiration Ratio Benefits the Deceleration Capacity Index of Heart Rate in Assessing the Sympatho-vagal Balance
Effects of Physical Exercise and Glibenclamide in Local Activation Waves During Ventricular Fibrillation
Predicting Atrial Fibrillation Recurrence After Catheter Ablation Through Time Variability of P-wave Features
Deep Neural Network Trained on Surface ECG Improves Diagnostic Accuracy of Prior Myocardial Infarction Over Q Wave Analysis
Repolarization Lability Measured by Spatial TT' Angle
Early Prediction of Sepsis from Clinical Data: the PhysioNet/Computing in Cardiology Challenge 2019
A Fast Algorithm for Facilitating Heartbeat Annotation in Long-Term ECG Signals
Recording and Identification of Cardiac Neuron Activity in the Right Atrium Ganglionated Plexus
Wearable Technology: Signal Recovery of Electrocardiogram From Short Spaced Leads in the Far-Field Using Discrete Wavelet Transform Based Techniques
Altered Nonlinear Dynamics of Atrial Fibrillation Detected After Ablation
Heart Rate Turbulence Modeling using Boosted Regression Trees
Quantification of Linear and Nonlinear Cardiorespiratory Interactions Under Autonomic Nervous System Blockade
A Robust Framework for Noninvasive Extraction of Fetal Electrocardiogram Signals
Machine Learning-based Classification of Ischemic and Non-Ischemic Exercise Stress Test ECG
Deep Convolutional Encoder-Decoder Framework for Fetal ECG Signal Denoising
Estimation and Removal of T Wave Component in Atrial Flutter ECG to Aid Non-Invasive Localization of Ectopic Source
Determining the Connection between Capacitively Coupled Electrocardiography Data and the Ground Truth
Deep Learning Based Heart Murmur Detection Using Frequency-time Domain Features of Heartbeat Sounds
Noise and Spatial-resolution Effect of Electrode Array on Rotor Tip Location during Atrial Fibrillation: A Simulation Study
Validation of Activation Recovery Interval in Structurally Normal Human Ventricles by Optical Mapping
The Effect of Heart Rate and Atrial Contraction on Left Ventricular Function
Alternans and 2-D Spiral Wave Dynamics in Human Atria with Short QT Syndrome Variant 3: A Simulation Study
Evaluation of ECGI Localization Accuracy for Single Pacings in CRT Patients
ECG Artefact Detection Using Ensemble Decision Trees
Identification of Strict Left Bundle Branch Block, Using a Moving Dipole Model
Measurement of Noise in ECG Signals to Improve Automatic Delineation
Computer-Assisted Quantitative Analysis of New Interventional Treatment Methods
Computer Modeling of Irrigated-tip Electrodes During RF Cardiac Ablation: Comparative Analysis between Including and Excluding the Problem of Fluid Dynamics
In Silico Investigation of the Functional Effects of KCNQ1-G269S Mutation in Human Ventricles
Evaluating Pauses in Holter ECG Signals
Respiratory Rate Estimation from Multilead ECG Delineation using VCG Directions on Fiducial Points
OSAS Severity is Associated to Decreased Heart Rate Turbulence Slope
Cardiovascular Effects of Mental Stress in Healthy Volunteers
Unsupervised Artefact Detection and Screening Using Emfit Sensor in Patients With Sleep Apnea
Wavelet Analysis for Multiresolution Tissue Characterization in Intracoronary Optical Images
A Wavelet-Based Approach for Automatic Diagnosis of Strict Left Bundle Branch Block
Computer-based Assessment of the Effects of Amiodarone on Short QT Syndrome Variant 1 in Human Ventricles
Cardiovascular Reflections of Sympathovagal Imbalance Precede the Onset of Atrial Fibrillation
Three-Dimensional Echocardiography Based Evaluation of Right Ventricular Remodeling in Patients with Pressure Overload
Cardiac Abnormality Detection in 12-lead ECGs With Deep Convolutional Neural Networks Using Data Augmentation
Predictive Analysis of Cardiac Resynchronization Therapy Response by means of the ECG
Electrocardiography-Based Assessment of Cardiac Contractility
Fast and Accurate Power Spectral Analysis of Heart Rate Variability using Fast Gaussian Gridding
Classification of Cardiac Abnormalities From ECG Signals Using SE-ResNet
Repolarization Parameters of Heart Transplant Subjects
Multi-level Information for Non-invasive Identification of Exit Site of Ventricular Tachycardia
Spatial Characterization of Hypertension Clusters using a Rural Australian Clinical Database
Continuous Vital Monitoring and Automated Alert Message Generation for Motorbike Riders
Classification of Supraventricular and Ventricular Beats by QRS Template Matching and Decision Tree
Evaluation of Computed Tomography to Ultrasound 2D Image Registration for Atrial Fibrillation Treatment
Comparison of Heart Rate Variability Assessment During Exercise from Polar RS800 and ECG
Deep Learning for Pulse Detection in Out-of-Hospital Cardiac Arrest Using the ECG
A Sliding Window Approach to Regularization in Electrocardiographic Imaging
Identifying Normal, AF and other Abnormal ECG Rhythms using a Cascaded Binary Classifier
eLab: A Web-based Platform to Perform HRV Analysis and Store Cardiac Signals
Personalized Ventricular Arrhythmia Simulation Framework to Study Vulnerable Trigger Locations on Top of Scar Substrate
Image-Guided Cardiac Interventions Using Contemporary Mid-Field Magnetic Resonance Imaging
Webbase Online Consulting System for Quasi Real Time Consultations of Cardiac Images
Causal Squared Coherence Analysis to Estimate Cardiorespiratory Coupling in Athletes
Contribution of the Slow Delayed Rectifier K + Current to Pacemaker Activity of the Human Sinoatrial Node
Bayesian Classification Applied to Strain in Arrhythmogenic Left-Ventricle Cardiomyopathy
A Parameter Identification Approach towards Analyzing Hemodynamics Based on Capnography
Effect of Reducing the Number of Leads from Body Surface Potential Mapping in Computer Models of Atrial Arrhythmias
A Computational Model of Open-Irrigated Electrode for Endocardial RF Catheter Ablation
Cardiac Effect of Acupuncture on the Neiguan Point
Intrapartum Fetal-State Classification Using Long Short-Term Memory Neural Networks
Sulfur Dioxide Effects on Human Atrial Action Potential. In Silico Study
Automated Musical Rhythm Transcription of ECG RR Interval Time Series as a Tool for Representing Rhythm Variations and Annotation Anomalies in Arrhythmia Heartbeat Classifications
A Qualitative Dynamical Model for Cardiotocography Simulation
Novel Method for Orientation-Independent Analysis in Equi-Spaced Multi-Electrode Arrays
Synchronization of Respiratory, Heartbeat and Blood Pressure Signals: 3D Plots and Indices
ECGlab: User Friendly ECG/VCG Analysis Tool for Research Environments
Time Delay Stability Analysis of Pairwise Interactions Amongst Ensemble-Listener RR Intervals and Expressive Music Features
Vital Sings Monitoring using a New Flexible Polymer Integrated PPG Senor
ECGI Periodicity Unraveled: A Deep Learning Approach for the Visualization of Periodic Spatiotemporal Patterns in Atrial Fibrillation Patients
Pro-arrhythmic Effects of Increased Late Sodium Current in Failing Human Heart
Physiological Variations in CX43 and Fibrosis Deposition Affect Human Ventricular Electrophysiology Promoting Arrhythmia
Spatiotemporal Activation Time Estimation Improves Noninvasive Localization of Cardiac Electrical Activity
Atrial Fibrillation Detection Using Boosting and Stacking Ensemble
Measures of Right Atrial Organization as a Means to Select Candidates for Sinus Rhythm Restoration by Catheter Ablation
Assessing Effect of Beat Detector on Detection Dependent Signal Quality Indices
Safety Ranges for Heart Rate Variability Parameters in Hyperbaric Environments
Speckle Tracking Analysis for Early Detection of Cardiotoxicity in Breast Cancer Patients
Nonlinear Energy Operators for Defibrillation Shock Outcome Prediction
ECG-Based Reconstruction of Heart Position and Orientation with Bayesian Optimization
Loss of Transverse-Tubules Promotes the Development of Ectopic Activity in Guinea-pig Ventricle
Role of Mechanics in Rhythm Disturbances in 1D Mathematical Model of Myocardial Tissue with Local Ca2+-Overload
Creating a Digital Twin to Investigate AV Block: In-sights From a Validated Electromechanical Full-Heart Model
Optimized Adjustment of Single Action-potentials to Case-specific Atrial Physiology: Towards Clinical Implementation
A Mixed-Domain Self-Attention Network for Multilabel Cardiac Irregularity Classification Using Reduced-Lead Electrocardiogram
Lightweight Arrhythmia Detection Based on Momentum Contrast Learning
Using Deep Gated RNN with a Convolutional Front End for End-to-End Classification of Heart Sound
Atrial Fibrillation Detection from PPG Interbeat Intervals via a Recurrent Neural Network
An Improved Iterative Pace-Mapping Algorithm to Detect the Origin of Premature Ventricular Contractions
Attacking Pathways of Health Information System (HIS)
Quantification of Cardiorespiratory Coupling in Acute Schizophrenia Applying High Resolution Joint Symbolic Dynamics
Cepstrum Feature Selection for the Classification of Sleep Apnea-Hypopnea Syndrome based on Heart Rate Variability
Hidden Hazards Beneath Cross-Validation Methods in Machine Learning-Based Sleep Apnea Detection
Heart Position Uncertainty Quantification in the Inverse Problem of ECGI
A Signal Decomposition Approach to Morphological Modeling of P-wave
Fetal Pulsed-Wave Doppler Atrioventricular Activity Detection by Envelope Extraction and Processing
Deep Generative Modeling and Analysis of Cardiac Transmembrane Potential
A Learning Based Statistical Approach for Combining Multiple Measurements in Electrocardiographic Imaging
An Algorithm to Sample an Anatomy With Uncertainty
Heartbeat Classification System using Adaptive Learning form Selected Beats
Autocorrelation Function for Predicting Arrhythmic Recurrences in Patients Undergoing Persistent Atrial Fibrillation Ablation
A Novel Model of Acute Myocardial Ischemia in Human Ventricular Cardiomyocytes
Detailed Electromechanical Model of Ventricular Wedge
An Eye-Tracking Assessment of Coronary Care Nurses during the Interpretation of Patient Monitoring Scenarios
Diastolic Augmentation Index Improves Augmentation Index in Assessing Arterial Stiffness
Validation of the V-index as a Metric of Ventricular Heterogeneity in Endocavitary Recordings
Unexpected Errors in the Electrocardiographic Forward Problem
Evaluation of Arterial Diameter by Mathematical Transformation of APG for Ambulatory Stiffness
Greedy Selection of the Torso Electrodes for the Solution of Inverse Problem with a Single Dipole
Time-frequency Analysis of the Autonomic Response to Head-up Tilt Testing in Brugada Syndrome
A Probabilistic Function to Model the Relationship between Quality of Chest Compressions and the Physiological Response for Patients in Cardiac Arrest
Will Two Do? Varying Dimensions in Electrocardiography: The PhysioNet/Computing in Cardiology Challenge 2021
Adaptive placement of the pseudo-boundaries improves the conditioning of the inverse problem