Dan Istrate

A Multi-Modal Dataset (MMSD) for Acute Stress Bio-Markers

Communications in computer and information science, 2023

An Ontology-based approach for Robot and Ambient System collaboration

HAL (Le Centre pour la Communication Scientifique Directe), Aug 28, 2017

In activity recognition, sensor based errors or uncertainties induce a wrong statement in the env... more In activity recognition, sensor based errors or uncertainties induce a wrong statement in the environment representation. To overcome these issues we introduce our ontology-based approach where a system, based on a mobile robot and an ambient system, is able to generate collaborative tasks when necessary to recognize activities. Using two ontologies to represent the environment, inconsistencies are detected and high level data are exchanged between both systems to correct and clarify ambiguous description of the environment. This process allows to generate adequate clarifying tasks by explicitly including knowledge and capabilities of each system. We expose our approach in two experiments where interaction between both systems are mandatory to respond a human "find an object" request in a first scenario and recognize multi user activities in a second scenario.

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Détection des artefacts de mouvement en utilisant un accéléromètre pour le suivi à domicile de la grossesse par analyse de l'EHG

HAL (Le Centre pour la Communication Scientifique Directe), May 31, 2017

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Détection automatique de bouffées d'activité contractile sur l'EHG par utilisation du critère d'information bayésien

HAL (Le Centre pour la Communication Scientifique Directe), May 31, 2017

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Physiological Data Recording in VR Simulator for Sleepiness Detection During Driving

Proceedings of the 16th International Joint Conference on Biomedical Engineering Systems and Technologies

Cough sound recognition for COVID-19 risk detection

HAL (Le Centre pour la Communication Scientifique Directe), May 20, 2021

The COVID-19 outbreak prompts the need for new ways to detect and prevent epidemics. Since cough ... more The COVID-19 outbreak prompts the need for new ways to detect and prevent epidemics. Since cough is one of the COVID-19 symptoms, our work proposes a sound recognition system based on our previous works which are able to detect different type of cough through a continuously home sound analysis. It is a part of EpiSemioWatch AMI COVID UTC funded project which aims to develop a detection system of epidemic risk in retirement home using sound and movement sensors. This paper presents the sound part of the global system and more explicitly the differentiation of cough from other environmental sound. The proposed system detects automatically the sound activity through a wavelet based system, realize an acoustic segmentation speech/sound and classify the cough sounds. A first evaluation of the system in our lab is presented.

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Analysis of the Impact of Inter-Beat-Interval Interpolation on real-time HRV Feature Estimation for e-Health Applications

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Multimodal Observation Method of Digital Accessibility for Elderly People

IRBM

Abstract This article presents a new methodological framework for multimodal observation of digit... more Abstract This article presents a new methodological framework for multimodal observation of digital technologies. It is based on the use of mixed methods developed in the interdisciplinary MAN project founded by CNRS. It focuses on the digital accessibility of older people. The originality of the method lies in the implementation of a method combining qualitative and quantitative measurement to determine relevant indicators. These indicators characterize the person's behavior when using a technology and its usability. We show how these indicators are built, based on the cross-referencing of data. We present the different tools (questionnaire, interviews and technological data recording tools) used in the MAN method in a living laboratory environment controlled with four volunteers. Two use scenarios are proposed to illustrate the method in assessing the accessibility of a tactile application for older people without a digital divide and without disabilities. We present the recorded qualitative and quantitative data and illustrate by an example the unrelatedness of these data through a specific annotation tool.

An Ontology-based approach for Robot and Ambient System collaboration

In activity recognition, sensor based errors or uncertainties induce a wrong statement in the env... more In activity recognition, sensor based errors or uncertainties induce a wrong statement in the environment representation. To overcome these issues we introduce our ontology-based approach where a system, based on a mobile robot and an ambient system, is able to generate collaborative tasks when necessary to recognize activities. Using two ontologies to represent the environment, inconsistencies are detected and high level data are exchanged between both systems to correct and clarify ambiguous description of the environment. This process allows to generate adequate clarifying tasks by explicitly including knowledge and capabilities of each system. We expose our approach in two experiments where interaction between both systems are mandatory to respond a human ”find an object” request in a first scenario and recognize multi user activities in a second scenario.

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Pre-term Birth Prediction at Home: Signal Filtering Influence on the Good Prediction Rate

In this paper, we propose an automatic prediction system allowing to predict high probability of ... more In this paper, we propose an automatic prediction system allowing to predict high probability of birth within 1–2 weeks from the EHG measurement [1, 2, 3]. Despite continuous clinical routine improvements, the preterm rate remains steady. With the aim of avoiding long hospitalization for pregnant women we propose an embedded system which acquires and processes EHG signals. We have already proposed a detection and recognition system for intrauterine contractions using directly the EHG signal obtained from a matrix of 16 electrodes. Since the measurements must be made at home, the decrease of computation power is an important constraint. In this work, we compare the results of the preterm birth prediction algorithm using a filtering step and with only the raw signals. The filtering step is applied directly on the raw signals or only on the automatically detected contractions to reduce computation time. We have applied in this, different filtering methods as denoising step to analyse t...

From conservative to dissipative non-linear differential systems. An application to the cardio-respiratory regulation

Discrete & Continuous Dynamical Systems - S, 2018

We start by coupling negative 2-circuits, which are characteristic of the presence of a regulatio... more We start by coupling negative 2-circuits, which are characteristic of the presence of a regulation loop in a dynamical system. This loop can be modelled with coupled differential equations represented in a first approach by a conservative differential system. Then, an example of regulation loop with a dissipative component will be given in human physiology by the vegetative system regulating the cardio-respiratory rhythms.

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Detection of Movement Artefacts and Contraction Bursts Using Accelerometer and Electrohysterograms for Home Monitoring of Pregnancy

IRBM, 2018

Abstract Background In developed countries, 10% of labors occur prematurely and are mainly due to... more Abstract Background In developed countries, 10% of labors occur prematurely and are mainly due to contractions appearing too soon during the pregnancy. To detect such contractions, we developed a wearable device able to record both the electrical activity of the uterus, electrohysterograms (EHG), thanks to 18 electrodes, but also the mother movements, thanks to an embedded accelerometer. Methods In this study, we investigated the detectability of a begin/end of contraction by analyzing EHG signals with the Bayes Information Criterion, and we analyzed the three axis accelerometer signals to characterize the mother activity when she is carrying the device (such movements being possible sources of artifacts in the EHG signals). Results For the contraction detections, we obtained 68.38% (599/876) of good detection but a too high number of false alarms (1073). To reduce this false alarm number, we analyzed the three accelerometer signals and detected 98.7% of static phases of the mother and 95% of dynamic ones. Discussion The detection of precise movements inside the dynamic cluster still has to be investigated to improve the first obtained results, as well as the combination of these two research ways (EHG and accelerometer) applied at the same time during recording.

Quatre ans de recherche urbaine 2001-2004. Volume 2

Destinée à promouvoir une recherche fondamentale pluridisciplinaire, l’Action Concertée Incitativ... more Destinée à promouvoir une recherche fondamentale pluridisciplinaire, l’Action Concertée Incitative Ville (ACIV) créée par le Ministère de la Recherche visait au renouvellement des problématiques, afin de mieux comprendre les enjeux urbains contemporains, les transformations en cours et d’anticiper les évolutions. Cet ouvrage dresse l’inventaire des recherches soutenues lors des quatre années de programmation de l’ACIV. Les deux tomes rassemblent 143 contributions qui manifestent, de la part d’équipes « confirmées », de « jeunes » chercheurs ou de doctorants, le foisonnement et la richesse des thèmes, des problématiques, des méthodes et des terrains. Ces contributions qui rendent compte des recherches financées par l’ACIV et des allocations de thèse soutenues par elle, s’organisent autour de six thématiques : « Formes urbaines, cultures et modes de vie », « Cohésion sociale et citoyenneté », « Modifications d’échelles, recomposition des systèmes territoriaux et gouvernance », « Cultures urbanistiques : des sources de l’histoire urbaine au développement urbain durable », « Milieux physiques, ambiances urbaines et technologies », « Management, gestion et systèmes techniques ». La postface ouvre, quant à elle, une réflexion critique et prospective « à plusieurs voix » sur le devenir de la recherche urbaine

Feasibility study of a serious game based on Kinect system for functional rehabilitation of the lower limbs

European Research in Telemedicine / La Recherche Européenne en Télémédecine, 2016

Summary Introduction Conventional functional rehabilitation costs time, money and effort for the ... more Summary Introduction Conventional functional rehabilitation costs time, money and effort for the patients and for the medical staff. Serious games have been used as a new approach to improve the performance as well as to possibly reduce medical cost in the future for cognitive rehabilitation and body balance control. The objective of this present work was to perform a feasibility study on the use of a new real-time serious game system for improving the musculoskeletal rehabilitation of the lower limbs. Materials and methods A basic functional rehabilitation exercise database was established with different levels of difficulties. A 3D virtual avatar was created and scaled to represent each subject-specific body. A portable and affordable Kinect sensor was used to capture real-time kinematics during each exercise. A specific data coupling process was developed. An evaluation campaign was established to assess the developed system. Results The squats exercise was the hardest challenge. Moreover, the performance of each functional rehabilitation exercise depended on the physiological profile of each participant. Our game system was clear and attractive for all functional rehabilitation exercises. All testing subjects felt motivated and secure when playing the rehabilitation game. Discussion The comparison with other systems showed that our system was the first one focusing on the functional rehabilitation exercises of the lower limbs. Conclusions Our system showed useful functionalities for a large range of applications (rehabilitation at home, sports training). Looking forward, new in-situation exercises will be investigated for specific musculoskeletal disorders.

Serious game and functional rehabilitation for the lower limbs

European Research in Telemedicine / La Recherche Européenne en Télémédecine, 2016

Summary Introduction Conventional functional rehabilitation consists of a therapeutic consultatio... more Summary Introduction Conventional functional rehabilitation consists of a therapeutic consultation, a motor exercise assignment, and an execution task with or without assistance of the therapist. The objective of this technical note was to present a new real-time 3D serious game system concept for musculoskeletal rehabilitation of the lower limbs. Materials and method A generic development workflow of real-time 3D serious game systems for functional rehabilitation of the lower limbs was proposed. A user-friendly system flowchart was also established for a better interaction between end-users and the game system. Result and discussion Different system components like avatar modeling, subject registration, rehabilitation game and feedback visualization and control were detailed and their advantages and limitations were discussed. Conclusions 3D serious game technologies open new perspectives for a large range of rehabilitation applications (at home or in clinic environment, sports training).

Application mobile utilisant des capteurs d’activité physique connectés pour l’accompagnement thérapeutique du patient diabétique

European Research in Telemedicine / La Recherche Européenne en Télémédecine, 2015

Objet de l’etude Le diabete et ses complications provoquent des maladies cardiovasculaires qui so... more Objet de l’etude Le diabete et ses complications provoquent des maladies cardiovasculaires qui sont des causes majeures de mortalite precoce. Dans ce projet, nous proposons une premiere approche pour integrer l’activite physique grâce aux objets connectes pour ameliorer le controle de la glycemie. L’application donnera des notifications en cas de risque d’hypoglycemie ou d’hyperglycemie. Methodes Afin d’integrer l’information de l’activite physique quotidienne du patient, le traqueur d’activite ZIP de Fitbit est utilise pour recueillir les mesures actimetriques du sujet. L’algorithme d’apprentissage non supervise « K-means » est applique pour regrouper les mesures afin de creer et mettre a jour des profils actimetriques types, specifiques au sujet. La methode d’apprentissage supervise « K-NN » est alors utilisee pour detecter le profil le plus proche et decider de declencher ou non une alerte. Resultats obtenus La Figure 1 represente les notifications generees par le programme de controle et de decision dans une journee. Une application mobile Android a ete developpee pour afficher les parametres et les notifications. L’Acceptabilite par les diabetiques Le travail de recherche, de conception et de developpement propose dans cette communication tient compte de la question de l’acceptabilite de cette application mobile de sante par les diabetiques. Un modele de recherche regroupant ces facteurs s’avere donc plus que jamais indispensable. Il doit etre teste a l’aide d’informations recueillies aupres des patients diabetiques pour determiner les facteurs qu’ils considerent comme facilitateurs de l’acceptabilite. Certaines hypotheses pourraient etre envisagees et retenues une fois validees par les malades. Elles porteraient sur la performance et l’usage de l’application mobile elle-meme et de son mode de deploiement. La confiance et la fiabilite sont deux autres facteurs critiques a considerer aussi. Aussi, l’influence sociale, de l’entourage et/ou du medecin traitant pourrait s’averer critique pour l’acceptabilite. Conclusion Cette communication presente une premiere approche d’utilisation des dispositifs de suivi d’activite physique pour les patients diabetiques. L’evaluation est en cours a l’heure actuelle.

Contribution at sound environnment analysis and at multimodal data fusion for activities identification in the framework of medical remote monitoring

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Contribution à l'analyse de l'environnement sonore et à la fusion multimodale pour l'identification d'activités dans le cadre de la télévigilance médicale

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Capteur sonore intelligent pour la réduction de la consommation d'énergie

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Speech and Sound Use in a Remote Monitoring System for Health Care

Lecture Notes in Computer Science, 2006

Ageing affects the economic and social foundations of societies at world level. Health care has t... more Ageing affects the economic and social foundations of societies at world level. Health care has to respond to the challenge that population ageing presents. Medical remote monitoring needs human operator to be assisted by means of smart information systems. Physiological and position sensors give numerous data, but speech analysis and sound classification can give interesting additional information about the patient and may help in decision-making. The entire analysis system is composed of parallel tasks: signal detection & channel selection, sound/speech classification, life sound classification and speech recognition. The multichannel sound processing allows us to localize the source of sound in the apartment and to select appropriate signal segments for analysis. Recognized key words indicative of a distress situation are extracted from sentences. Key words and classification results are sent to the medical remote monitoring application through network. An adapted speech corpus was recorded in French and used for evaluation purposes.

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Generic Implementation of a Distress Sound Extraction System for Elder Care

Medical remote monitoring at home is an alternative to improve the patient's comfort, to detect d... more Medical remote monitoring at home is an alternative to improve the patient's comfort, to detect distress situation rapidly and reduce hospitalization costs. Physiologic and position sensors give already numerous information, but sound classification can give interesting additional information. A Real-Time implementation of a smart sound system capable of detecting and identifying sound events in noisy conditions is presented in this paper. The advantage of this implementation is the use of a generic PC station: the hardware requirements are only a sound card, a microphone and an internet link used to transmit alarm. In the case of an alarm, the information can be sent through network to a remote monitoring center and/or to a close person by email or SMS. The system is composed of 2 modules: detection and classification. The event detection module is carried out in real time in order to extract possible alarm sounds. The sound classification module is launched in a parallel task; it carries out a first segmentation between sound and speech. In the speech case, a speech recognition system is launched (not described in this paper) and in the sound case, a classification between predefined classes is carried out.

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