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Dissertations / Theses on the topic 'ECG extraction'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Peddaneni, Hemanth. "Comparison of algorithms for fetal ECG extraction." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0007480.

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2

Niknazar, Mohammad. "Extraction et débruitage de signaux ECG du foetus." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00954175.

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Les malformations cardiaques congénitales sont la première cause de décès liés à une anomalie congénitale. L''electrocardiogramme du fœtus (ECGf), qui est censé contenir beaucoup plus d'informations par rapport aux méthodes échographiques conventionnelles, peut ˆêtre mesuré'e par des électrodes sur l'abdomen de la mère. Cependant, il est tr'es faible et mélangé avec plusieurs sources de bruit et interférence y compris l'ECG de la mère (ECGm) dont le niveau est très fort. Dans les études précédentes, plusieurs méthodes ont été proposées pour l'extraction de l'ECGf à partir des signaux enregistr

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3

Michael, Pratheek. "Simulation Studies on ECG Vector Dipole Extraction in Liquid Medium." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6625.

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To circumvent some inherent problems in the conventional ECG, this research reinvestigates an ‘unassisted’ approach which enables ECG measurement without the placement of leads on the body. Employed in this research is a widely accepted assumption that the electrical activity of the heart may be represented, largely, by a 3-D time-varying current dipole (3D-CD). From the PhysioBank database, mECG and fECG data were obtained, and Singular Value Decomposition (SVD) was performed to estimate the time-varying Vector ECG dipole. To determine the sensing matrix responsible for transforming the activ

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4

Darrington, John Mark. "Real time extraction of ECG fiducial points using shape based detection." University of Western Australia. School of Computer Science and Software Engineering, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0152.

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The electrocardiograph (ECG) is a common clinical and biomedical research tool used for both diagnostic and prognostic purposes. In recent years computer aided analysis of the ECG has enabled cardiographic patterns to be found which were hitherto not apparent. Many of these analyses rely upon the segmentation of the ECG into separate time delimited waveforms. The instants delimiting these segments are called the

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5

Bin, Safie Sairul Izwan. "Pulse domain novel feature extraction methods with application to ecg biometric authentication." Thesis, University of Strathclyde, 2012. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=17829.

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This thesis presents the concept of representing finite signals in terms of sequential output pulses called pulse domain to extract Electrocardiogram (ECG) features for biometric authentication systems. Two novel methods based on the pulse domain philosophy namely Pulse Active (PA) and Adaptive Pulse Active (APA) techniques are presented in this thesis. A total of 11 algorithms are derived from these two methods and used to generate novel ECG feature vectors. Six algorithms of the PA technique are named as Pulse Active Bit (PAB), Pulse Active Width (PAW), Pulse Active Area (PAA), Pulse Active

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6

Janjarasjitt, Suparerk. "A NEW QRS DETECTION AND ECG SIGNAL EXTRACTION TECHNIQUE FOR FETAL MONITORING." Case Western Reserve University School of Graduate Studies / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=case1144263231.

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7

Tang, Yu. "Feature Extraction for the Cardiovascular Disease Diagnosis." Thesis, Mittuniversitetet, Avdelningen för informationssystem och -teknologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-33742.

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Cardiovascular disease is a serious life-threatening disease. It can occur suddenly and progresses rapidly. Finding the right disease features in the early stage is important to decrease the number of deaths and to make sure that the patient can fully recover. Though there are several methods of examination, describing heart activities in signal form is the most cost-effective way. In this case, ECG is the best choice because it can record heart activity in signal form and it is safer, faster and more convenient than other methods of examination. However, there are still problems involved in t

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8

Islam, Mohd Siblee. "A Decision Support System for StressDiagnosis using ECG Sensor." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-11769.

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Diagnosis of stress is important because it can cause many diseases e.g., heart disease, headache, migraine, sleep problems, irritability etc. Diagnosis of stress in patients often involves acquisition of biological signals for example heart rate, finger temperature, electrocardiogram (ECG), electromyography signal (EMG), skin conductance signal (SC) etc. followed up by a careful analysis of the acquired signals. The accuracy is totally dependent on the experience of an expert. Again the number of such experts is also very limited. Heart rate is considered as an important parameter in determin

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9

Koc, Bengi. "Detection And Classification Of Qrs Complexes From The Ecg Recordings." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12610328/index.pdf.

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Electrocardiography (ECG) is the most important noninvasive tool used for diagnosing heart diseases. An ECG interpretation program can help the physician state the diagnosis correctly and take the corrective action. Detection of the QRS complexes from the ECG signal is usually the first step for an interpretation tool. The main goal in this thesis was to develop robust and high performance QRS detection algorithms, and using the results of the QRS detection step, to classify these beats according to their different pathologies. In order to evaluate the performances, these algorithms were teste

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10

Noorzadeh, Saman. "Extraction de l'ECG du foetus et de ses caractéristiques grâce à la multi-modalité." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT135/document.

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La surveillance de la santé foetale permet aux cliniciens d’évaluer le bien-être du foetus,de faire une détection précoce des anomalies cardiaques foetales et de fournir les traitementsappropriés. Les développements technologies actuels visent à permettre la mesurede l’électrocardiogramme (ECG) foetal de façon non-invasive afin d’extraire non seulementle rythme cardiaque mais également la forme d’onde du signal. Cet objectif est rendudifficile par le faible rapport signal sur bruit des signaux mesurés sur l’abdomen maternel.Cette mesure est donc toujours un challenge auquel se confrontent beau

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11

Andreotti, Lage Fernando. "Extraction and Detection of Fetal Electrocardiograms from Abdominal Recordings." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-222460.

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The non-invasive fetal ECG (NIFECG), derived from abdominal surface electrodes, offers novel diagnostic possibilities for prenatal medicine. Despite its straightforward applicability, NIFECG signals are usually corrupted by many interfering sources. Most significantly, by the maternal ECG (MECG), whose amplitude usually exceeds that of the fetal ECG (FECG) by multiple times. The presence of additional noise sources (e.g. muscular/uterine noise, electrode motion, etc.) further affects the signal-to-noise ratio (SNR) of the FECG. These interfering sources, which typically show a strong non-stati

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12

Hapuarachchi, Pasan. "Feature selection and artifact removal in sleep stage classification." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2879.

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The use of Electroencephalograms (EEG) are essential to the analysis of sleep disorders in patients. With the use of electroencephalograms, electro-oculograms (EOG), and electromyograms (EMG), doctors and EEG technician can make conclusions about the sleep patterns of patients. In particular, the classification of the sleep data into various stages, such as NREM I-IV, REM, Awake, is extremely important. The EEG signal itself is highly sensitive to physiological and non-physiological artifacts. Trained human experts can accommodate for these artifacts while they are analyzing the EEG si

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13

Behar, Joachim. "Extraction of clinical information from the non-invasive fetal electrocardiogram." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:94b866ff-dd57-4446-85ae-79dd6d983cac.

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Estimation of the fetal heart rate (FHR) has gained interest in the last century; low heart rate variability has been studied to identify intrauterine growth restricted fetuses (prepartum), and abnormal FHR patterns have been associated with fetal distress during delivery (intrapartum). Several monitoring techniques have been proposed for FHR estimation, including auscultation and Doppler ultrasound. This thesis focuses on the extraction of the non-invasive fetal electrocardiogram (NI-FECG) recorded from a limited set of abdominal sensors. The main challenge with NI-FECG extraction techniques

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14

Akhbari, Mahsa. "Analyse des intervalles ECG inter- et intra-battement sur des modèles d'espace d'état et de Markov cachés." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT026.

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Les maladies cardiovasculaires sont l'une des principales causes de mortalité chez l'homme. Une façon de diagnostiquer des maladies cardiaques et des anomalies est le traitement de signaux cardiaques tels que le ECG. Dans beaucoup de ces traitements, des caractéristiques inter-battements et intra-battements de signaux ECG doivent être extraites. Ces caractéristiques comprennent les points de repère des ondes de l’ECG (leur début, leur fin et leur point de pic), les intervalles significatifs et les segments qui peuvent être définis pour le signal ECG. L'extraction des points de référence de l'E

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15

Waloszek, Vojtěch. "Identifikace a verifikace osob pomocí záznamu EKG." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442492.

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In the past years, utilization of ECG for verification and identification in biometry is investigated. The topic is investigated in this thesis. Recordings from ECG ID database from PhysioNet and our own ECG recordings recorded using Apple Watch 4 are used for training and testing this method. Many of the existing methods have proven the possibility of using ECG for biometry, however they were using clinical ECG devices. This thesis investigates using recordings from wearable devices, specifically smart watch. 16 features are extracted from ECG recordings and a random forest classifier is used

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16

RANDAZZO, VINCENZO. "Novel neural approaches to data topology analysis and telemedicine." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2850610.

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17

Ředina, Richard. "Model fibrilace síní." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442495.

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The aim of this master thesis is to create a 3D electroanatomical model of a heart atria, which would be able to perform atrial fibrillation. To control the model, the differential equations of the FitzHugh-Nagumo model were chosen. These equations describe the change of voltage on the cell membrane. The equations have established parameters. The modification of them leads to changes in the behavior of the model. The simulations were performed in the COMSOL Multiphysics environment. In the first step, the simulations were performed on 2D models. Simulations of healthy heart, atrial flutter and

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18

Chan, Weng Chi. "ECG parameter extractor of intelligent home healthcare embedded system." Thesis, University of Macau, 2005. http://umaclib3.umac.mo/record=b1445845.

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19

Aydin, Serap. "Extraction Of Auditory Evoked Potentials From Ongoing Eeg." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606641/index.pdf.

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In estimating auditory Evoked Potentials (EPs) from ongoing EEG the number of sweeps should be reduced to decrease the experimental time and to increase the reliability of diagnosis. The &macr<br>rst goal of this study is to demon- strate the use of basic estimation techniques in extracting auditory EPs (AEPs) from small number of sweeps relative to ensemble averaging (EA). For this purpose, three groups of basic estimation techniques are compared to the traditional EA with respect to the signal-to-noise ratio(SNR) improve- ments in extracting the template AEP. Group A includes the combination

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20

Palmadottir, Julia. "Extracting ECA rules from UML." Thesis, University of Skövde, Department of Computer Science, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-541.

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<p>Active technology in database management systems (DBMS) enables the movement of behaviour dependent on the system’s state, from the application software to a rule base in the DBMS. With active technology in database systems, the problem of how to design active behaviour has become an important issue. Modelling processes do not foresee support for design of active rules which can lead to conflicts between the event-condition-action (ECA) rules representing the active behaviour and the application systems, using the active DBMS. The unified modelling language (UML) is a widely used notation l

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21

Galvan, D'Alessandro Leandro. "Eco-procédés pour la récupération sélective d’antioxydants à partir d’Aronia melanocarpa et ses co-produits." Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10134/document.

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Les fruits d’Aronia melanocarpa sont une des sources végétales les plus riches en substances phénoliques antioxydantes et notamment en anthocyanines. L’influence des principaux paramètres opératoires sur la cinétique et les rendements d’extraction assistée par ultrasons des anthocyanines et des polyphénols totaux à partir d’aronia et ses co-produits a été étudiée. La cinétique d’extraction a été décrite par des équations basées sur le modèle de Peleg. Le développement d’un modèle global (intégrant le temps, la température, la composition du solvant et la puissance d’ultrasons) a été proposé co

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22

Nahman, Michal Rachel. "Israeli extraction : an ethnographic study of egg donation and national imaginaries." Thesis, Lancaster University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431739.

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This thesis derives from ethnographic research undertaken in sites of Israeli NF and egg donation between January and September 2002. The thesis begins with an examination of some features of the general context of Israeli ova donation through an analysis of a set of stories about the theft of ova and an egg shortage crisis, which emerged in the year prior to my fieldwork in Israel (2001). It then moves to an examination of NF and egg donation at a state run clinic in Jerusalem. From there I trace some new practices of transnational ova donation in three sites and sets of practices: an IVF cli

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23

Wahl, Casper. "Training Autoencoders for feature extraction of EEG signals for motor imagery." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-53392.

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Electroencephalography (EEG) is a common technique used to read brain activity from an individual, and can be used for a wide range of applications, one example is during the rehab process of stroke victims. Loss of motor function is a common side effect of strokes, and the EEG signals can show if sufficient activation of the part of the brain related to the motor function that the patient is training has been achieved. Reading and understanding such data manually requires extensive training. This thesis proposes to use machine learning to automate the process of determining if sufficient acti

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24

Kaufman, Irene Jennifer. "The Recovery of Protein from Egg Yolk Protein Extraction Granule Byproduct." DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1738.

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In addition to proving an excellent source of nutrients, eggs are used in the food, cosmetic, and biotechnology industries for their rheological and bioactive properties. Much of the potential for the added value is in individual components of the egg, rather than the whole egg. At low speed centrifugation, yolk separates into two distinct fractions—granules and plasma. It is becoming increasingly popular in the industry to remove the plasma fraction of the egg yolk to use for its livetins, particularly immunoglobulin Y, leaving behind a granule by-product (“yellow cake”). Previous research ha

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25

Belghith, Yosra. "Eco-extraction de biomolécules à haute valeur ajoutée à partir de grignons d’olive." Electronic Thesis or Diss., Avignon, 2023. http://www.theses.fr/2023AVIG0119.

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Le grignon d’olive est le coproduit principal généré par le procédé d’extraction de l’huile d’olive. Bien que délétère pour l’environnement, le grignon d’olive est une source potentielle de molécules naturelles bénéfiques pour la santé humaine. Une partie de nos travaux a été consacrée à la caractérisation d’un extrait éthanolique de grignon d’olive. L’analyse par UPLC/MS nous a permis d’identifier 59 métabolites secondaires dont les plus abondants sont l’hydroxytyrosol, le tyrosol, l’oleuropéine aglycone, l’oléoside, l’acide caféique et l’acide pcoumarique. Des tests biologiques ont montré qu

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Dejoye, Céline. "Eco-extraction et analyse de lipides de micro-algues pour la production d'algo-carburant." Thesis, Avignon, 2013. http://www.theses.fr/2013AVIG0251/document.

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La biodiversité des micro-algues constitue un réel potentiel pour la recherche et l’industrie. En comparaison des plantes terrestres, elles sont une piste prometteuse pour les biocarburants. Néanmoins, un certain nombre de verrous technologiques restent à lever comme l’extraction de l’huile algale. L’objectif de cette thèse a donc consisté en l’innovation et le développement de nouvelles méthodologies dits « vertes » d’extraction de lipides de micro-algues pour une application biocarburant.La première partie de ce manuscrit propose une alternative à l’utilisation de solvants pétrochimiques (n-

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27

Grippe, Edward, and Mattias Lönnerberg. "Detecting Epileptic Seizures : Optimal Feature Extraction from EEG for Support Vector Machines." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166702.

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Epilepsy is a chronic neurological brain disorder causing the affected to have seizures.Looking at EEG recordings, an expert is able to identify epileptic activity and diagnosepatients with epilepsy. This process is time consuming and calls for automatization. Theautomation process is done through feature extraction and classification. The featureextraction finds features of the signal and the classification uses the features to classify thesignal as epileptic or not. The accuracy of the classification varies depending on both whichfeatures is chosen to represent each signal and which classifi

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28

Gallis, Rodrigo Bezerra de Araújo. "Extração semi-automática da malha viária em imagens aéreas digitais de áreas rurais utilizando otimização por programação dinâmica no espaço objeto /." Presidente Prudente : [s.n.], 2006. http://hdl.handle.net/11449/100262.

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Resumo: Este trabalho propõe uma nova metodologia para extração de rodovias utilizando imagens aéreas digitais. A inovação baseia-se no algoritmo de Programação dinâmica (PD), que nesta metodologia realiza o processo de otimização no espaço objeto, e não no espaço imagem como as metodologias tradicionais de extração de rodovias por PD. A feição rodovia é extraída no espaço objeto, o qual implica um rigoroso modelo matemático, que é necessário para estabelecer os pontos entre o espaço imagem e objeto. Necessita-se que o operador forneça alguns pontos sementes no espaço imagem para descrever gro

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29

Pradal, Delphine. "Eco-procédés d'extraction de polyphénols antioxydants à partir d'un co-produit agro-alimentaire." Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10190/document.

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Dans un contexte de développement durable, des méthodologies pour l'optimisation multicritère d'éco-procédés pour la récupération de polyphénols antioxydants à partir de co-produits ont été proposées, tenant compte des rendements en polyphénols totaux, de l'activité antioxydante des extraits obtenus à partir de marc de chicorée ainsi que de la consommation d'énergie de l'équipement durant le temps de traitement. L'étude d'un procédé d'extraction assistée par ultrasons a permis de mettre en évidence les gains en durée de traitement et en énergie grâce à l'application des ultrasons. Un modèle gl

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30

Villalpando, Mayra Bittencourt. "Stimuli and feature extraction methods for EEG-based brain-machine interfaces: a systematic comparison." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-19032018-090128/.

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A brain-machine interface (BMI) is a system that allows the communication between the central nervous system (CNS) and an external device (Wolpaw et al. 2002). Applications of BMIs include the control of external prostheses, cursors and spellers, to name a few. The BMIs developed by various research groups differ in their characteristics (e.g. continuous or discrete, synchronous or asynchronous, degrees of freedom, others) and, in spite of several initiatives towards standardization and guidelines, the cross comparison across studies remains a challenge (Brunner et al. 2015; Thompson et al. 20

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Angoy, Alice. "Eco-extraction par micro-ondes couplée à un champ centrifuge Development of microwave-assisted dynamic extraction by combination with centrifugal force for polyphenols extraction from lettuce Microwave technology for food applications." Thesis, Avignon, 2019. http://www.theses.fr/2019AVIG0274.

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Les préoccupations environnementales actuelles comme l’épuisement des ressources fossiles, l’émission de gaz à effets de serre ou le réchauffement climatique imposent aux industriels de réduire leur impact sur l’environnement et de s’insérer dans une démarche plus verte. Dans le domaine de l’extraction cela se traduit, depuis quelques années, par le développement de techniques innovantes pour remplacer les procédés actuels utilisant des solvants pétro-sourcés et très énergivores. L’objectif de cette thèse a donc consisté en la recherche et le développement d’un nouveau procédé d’éco-extraction

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Chaabani, Emna. "Eco-extraction et valorisation des métabolites primaires et secondaires des différentes parties de Pistacia lentiscus." Thesis, Avignon, 2019. http://www.theses.fr/2019AVIG0714.

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Le développement de la chimie verte, l’épuisement des ressources pétrolières et la prise de conscience des risques liée à l’utilisation des solvants pétroliers ont conduit à la recherche de nouvelles alternatives pour réduire l’utilisation des solvants nocifs non renouvelables tels que l’hexane. L’objectif de cette thèse a donc consisté en la recherche de solvants alternatifs plus respectueux de la santé et de l’environnement pour l’éco-extraction des composés phénoliques et des acides gras à partir des graines de Pistacia lentiscus et des arômes à partir de ces feuilles. Pour ce faire, une pr

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Leouffre, Marc. "Extraction de sources d'électromyogrammes et évaluation des tensions musculaires." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT009/document.

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L'évaluation des tensions musculaires chez l'Homme dans les sciences du mouvement et les études posturales présente un grand intérêt pour le sport, la santé ou encore l'ergonomie. La biomécanique s'intéresse tout particulièrement à ces problèmes utilise la cinématique inverse pour recalculer, à partir de mesures physiques externes, les tensions musculaires internes. Le verrou scientifique principal de cette technique est la redondance musculaire, propre au vivant. En effet les actionneurs (muscles) sont plus nombreux que les degrés de liberté à contrôler. Les problèmes de cinématique inverse s

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Caparos, Matthieu. "Analyse automatique des crises d'épilepsie du lobe temporal à partir des EEG de surface." Phd thesis, Institut National Polytechnique de Lorraine - INPL, 2006. http://tel.archives-ouvertes.fr/tel-00118993.

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L'objectif de la thèse est le développement d'une méthode de caractérisation des crises d'épilepsie du lobe temporal à partir des EEG de surface et plus particulièrement de la zone épileptogène (ZE) à l'origine des crises.<br />Des travaux récents validés en stéréoélectroencéphalographie (SEEG) ont démontré une évolution des synchronisations entre structures cérébrales permettant une caractérisation de la dynamique des crises du lobe temporal.<br />L'originalité des travaux consiste à étendre les méthodes développées en SEEG, à l'étude des signaux EEG de surface. Du point de vue médical, ce tr

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35

Barea, Jaqueline Alves. "Extração de DNA de material de arquivo e fontes escassas para utilização em reação de polimerização em cadeia (PCR) /." Botucatu : [s.n.], 2001. http://hdl.handle.net/11449/94771.

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Orientador: Maria Inês de Moura Campos Pardini<br>Resumo: Este trabalho visou a comparação de 5 diferentes métodos de extração de DNA, a partir de amostras de materiais de arquivo (tecido incluído em parafina, lâmina de hemograma corada e não corada com Leishman, lâmina de mielograma, gotas de sangue em Guthrie card) e fontes escassas (células bucais, 1 e 3 bulbos capilares, 2 mL de urina), para avaliar a facilidade de aplicação dos mesmos e possibilidade de amplificação desse DNA pela técnica de PCR. Os métodos incluíram digestão por proteinase K, seguida e não seguida por purificação com fen

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An, Tien Li. "Efeitos da retração dentária sobre o ponto "A" em pacientes submetidos ao tratamento ortodôntico /." Araçatuba : [s.n.], 2003. http://hdl.handle.net/11449/95808.

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Orientador: Osmar Aparecido Cuoghi<br>Banca: Luiz Gonzaga Gandini Júnior<br>Banca: Eduardo César Almada Santos<br>Resumo: Objetivou-se avaliar o efeito da retração dentária sobre o ponto A nos sentidos ântero-posterior e vertical, bem como a correlação e a previsibilidade dos comportamentos dessas estruturas. Utilizou-se 60 telerradiogafias em norma lateral, tomadas no início e no final do tratamento ortodôntico corretivo de 30 pacientes (22 femininos e 8 masculinos) entre 10 e 17 anos, com má oclusão de Classe II, divisão 1 e de Classe I, com extração dos primeiros pré-molares superiores. Alé

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Mnayer, Dima. "Eco-Extraction des huiles essentielles et des arômes alimentaires en vue d'une application comme agents antioxydants et antimicrobiens." Thesis, Avignon, 2014. http://www.theses.fr/2014AVIG0257/document.

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Les huiles essentielles et les arômes des plantes constituent un réel potentiel pour l’industrie dans le but de substituer aux composés synthétiques ayant des effets néfastes sur la santé et l’environnement. Afin de contribuer aux principes de la chimie verte, cette étude porte sur l’éco-extraction et la valorisation des extraits naturels des plantes et le développement d’une nouvelle technologie «verte» pour l’extraction des composés aromatiques naturels. La première partie de ce manuscrit mets en évidence les propriétés biologiques des huiles essentielles et des arômes et l’importance de leu

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Vachirachewin, Ratchaya [Verfasser]. "Thermostability of selected viruses in the presence of liquid egg yolk and distribution of virus during acetone extraction and microfiltration of egg yolk phospholipids / Ratchaya Vachirachewin." Berlin : Freie Universität Berlin, 2013. http://d-nb.info/1034073893/34.

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Gaumer, Gaëtan. "Résumé de données en extraction de connaissances à partir des données (ECD) : application aux données relationnelles et textuelles." Nantes, 2003. http://www.theses.fr/2003NANT2025.

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Les travaux présentés dans cette thèse ont été réalisés dans le cadre d'un contrat CNET JMINER, dont le but est l'étude de pré-traitement et post-traitements en extraction de connaissances à partir des données, appliqués aux lettres de réclamation de France Télécom. Les caractéristiques particulières des données de cette application ont orienté nos travaux de recherche. Nous nous sommes tout d'abord intéressés aux problèmes liés à l'extraction de connaissances à partir de très importants volumes de données. Nous proposons, pour résoudre ces problèmes, de remplacer les données à traiter par un

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Souza, Flávia Vieira de. "Curva de crescimento e exportação de nutrientes e sódio por frutos de mangueira Palmer, Haden e Tommy Atkins /." Jaboticabal : [s.n.], 2007. http://hdl.handle.net/11449/88321.

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Resumo: Objetivou-se com o presente estudo determinar a curva de crescimento e a extração de nutrientes e sódio por frutos de mangueira Haden, Palmer e Tommy Atkins. O estudo foi conduzido em uma área de produção comercial de mangas em Janaúba-MG. O delineamento experimental para cada variedade de manga foi inteiramente casualizado, com cinco repetições e os tratamentos corresponderam as épocas de amostragem das panículas . Cada unidade experimental foi composta por cinco plantas. Durante o pleno florescimento, foram demarcadas seis panículas por planta, iniciando a coleta quando os frutos ati

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Mendes, Tatiana Sussel Gonçalves. "Extração semi-automática de rodovias em imagens digitais usando técnicas de correlação e o princípio de teste ativo /." Presidente Prudente : [s.n.], 2005. http://hdl.handle.net/11449/88530.

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Orientador: Aluir Porfírio Dal Poz<br>Resumo: É esperado que o operador humano permaneça, por um longo tempo, como parte integrante do sistema de extração de feições. Portanto, as pesquisas que caminham para o desenvolvimento de novos métodos semi-automáticos são ainda de grande importância. Nesta linha, esta pesquisa propõe um método semi-automático para a extração de rodovias em imagens digitais. A metodologia é uma combinação entre técnicas de correlação e estratégia de teste ativo. Os resultados experimentais obtidos da aplicação do método em imagens reais mostram que o método funciona cor

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Ranepura, Hewage Lahiru P. "Developing and optimizing methods for grape seed polyphenol extraction." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2023. https://ro.ecu.edu.au/theses/2645.

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Dietary polyphenols have been positively correlated to the reduced risk of several chronic diseases, including Alzheimer' disease (AD). Grape (Vitis vinifera) seed contains 5-8 % polyphenols and annually, 2.5 million tonnes of grape seed is generated in the juice and wine industry. Grape seed extract (GSE) and its compounds gallic acid (GA), resveratrol (RSV) and epigallocatechin gallate (EGCG) have been shown to attenuate AD aetiological features including oxidative stress, protein aggregation, and mitochondrial dysfunction in cell and animal models. The main objectives of this work were to o

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Gupta, Raviranjan. "Fetal ECG Extraction Methods." Thesis, 2015. http://ethesis.nitrkl.ac.in/7716/1/2015_Fetal_ECG_Gupta.pdf.

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The electrocardiogram signal of fetus, i.e; FECG express very clear information which helps doctors in making appropriate and timed decision during labor. The profound interest of FECG analysis is in the field of biomedical applications and clinical diagnosis. FECG is extracted from composite abdominal signals using advanced methodologies, and plays a pivotal role in automated fetal monitoring systems. In this thesis we have used various strategies and existing algorithms for FECG detection and analysis to facilitate proficient and detailed understanding of FECG and its role in monitoring of f

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Huang, Li-An, and 黃立安. "Development of PC-Based ECG system and Image ECG Features Extraction." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/01214174034474159870.

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碩士<br>國立陽明大學<br>醫學工程研究所<br>94<br>Abstract The image electrocardiogram (ECG) display method can give an integral view in temporal evolution and spatial distribution of cardiac signals, and provide 12-lead ECG to enhance the efficacy of differentiation of the signal relativity and variation. In this research, lead II was not only applied to detect P, R, and T wave, but also served as an assistant of localization by the spatial distribution of image ECG. The function of automatic spatial location can facilitate the amateur cardiology doctors understanding the location of waves in image EC

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YOU, HONG-ZHI, and 游宏志. "Adaptive filter design for ECG waveform extraction." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/22051571465035696949.

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MUNJAL, NAVEEN KUMAR. "ECG DENOISING USING THE WAVELETS AND ROBUST ANALYSIS OF ECG SIGNALS." Thesis, 2013. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15780.

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The project aims at the successful development of an algorithm to rapidly and efficiently denoising the ECG waveforms . In general, ECG signals affected by noises such as baseline wandering,power line interference, electromagnetic interference, and high frequency noises during data acquisition. In order to retain the ECG signal morphology, several researches have adopted using different preprocessing methods. I have considered the Discrete Wavelet Transform (DWT) based wavelet denoising have incorporated using different thresholding techniques to remove three major sources of noises from the a

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Chiu, Shao-Yu, and 邱少禹. "Extraction of ECG, EGG and respiratory signal from single composite abdominal signal." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/60950518097141706285.

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碩士<br>國立臺灣大學<br>醫學工程學研究所<br>97<br>The lack of integrated bio-signal detection instruments made monitor patients’ multiple physiology parameters rather complicated in the past. Many electrodes need be applied to the body surface at the same time. Those recording devices may have interference with by each other. In addition, patients at home may have sudden attack of discomfort, an easy implemented device that can record a variety of essential physiological signals through simple operation will be extremely helpful. These signals can also be transferred through the network to health care special

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Panigrahy, Damodar. "Extraction of Fetal ECG Signal from the Single Channel Abdominal ECG Signal Recording." Thesis, 2018. http://ethesis.nitrkl.ac.in/9793/1/2018_PHD_DPanigrahy_513EE1007_Extraction.pdf.

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The popular technique used for detection of fetal heart rate before delivery is Fetal Electrocardiogram (FECG). It shows the muscular function and electrical activity of the fetus heart. It represents the characteristics such as dynamic behaviors, waveform and heart rate of the fetus. These characteristics help to determine the fetal development, the existence of fetal distress, fetal life, fetal maturity or congenital heart disease. These above characteristics help the doctors for appropriate treatment during pregnancy. The heart rate of the fetus can easily be detected after estimation

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Liao, Chun-Kai, and 廖俊凱. "Implementation Real-Time ECG Feature Extraction Using FPGA." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/73033282462503282882.

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碩士<br>中原大學<br>生物醫學工程研究所<br>98<br>The objective is to develop an algorithm for processing the electrocardiogram (ECG) signals that will be extracting the ECG features and to implement it using the FPGA as a testing prototype for System on Chip (Soc) design. The algorithm will be analyzing the component of the ECG signals and information in real time and to identify the abnormal rhythm and heart beat. The program controls the detection, analysis and monitoring of the LCD, USB and Flash Memory of the FPGA. Both the ECG signal in real time and the analyzed information can be displayed on the LCD p

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Wu, S.-chien, and 吳思謙. "Wavelet-Based 12 Lead ECG Characteristic Waves Extraction." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/95646358979592593779.

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碩士<br>中華大學<br>資訊工程學系碩士班<br>95<br>12-lead electrocardiograph (E.C.G.) characteristic waves extraction is important key technique for cardiac disease diagnosis by auto-computer analysis. So far, 12-lead ECG instruments is not having diagnosis and analysis by auto-computer in Taiwan besides HP、Pagewrite200、PHILIPS. Therefore, rely on the development of 12-lead ECG characteristic point extraction, establish a instrument which has cardiac disease diagnosis by auto-computer analysis in Taiwan. Our research is ECG characteristic waves extraction based wavelet transform for all kinds of cardiac diseas

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