David Naranjo

David Naranjo
Universidad de Sevilla | US · Biomedical Engineering Group

Doctor of Engineering

About

47
Publications
10,955
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769
Citations

Publications

Publications (47)
Article
Full-text available
Frailty syndrome is an independent risk factor for serious health episodes, disability, hospitalization, falls, loss of mobility, and cardiovascular disease. Its high reversibility demands personalized interventions among which exercise programs are highly efficient to contribute to its delay. Information technology-based solutions to support frail...
Article
El presente artículo da cuenta de la investigación para la innovación, diseño y desarrollo industrial de un dispositivo médico portable que obtiene datos relevantes de la bioimpedancia humana con precisión clínica, desarrollado en el Grupo de Ingeniería Biomédica de la Universidad de Sevilla en conjunto con el Tecnológico de Costa Rica para su dise...
Article
Full-text available
Body Sensor Networks (BSN) have emerged as a particularization of Wireless Sensor Networks (WSN) in the context of body monitoring environments, closely linked to healthcare applications. These networks are made up of smart biomedical sensors that allow the monitoring of physiological parameters and serve as the basis for e-Health applications. Thi...
Article
Full-text available
Non-oncologic chronic pain is a common high-morbidity impairment worldwide and acknowledged as a condition with significant incidence on quality of life. Pain intensity is largely perceived as a subjective experience, what makes challenging its objective measurement. However, the physiological traces of pain make possible its correlation with vital...
Article
Full-text available
This work addresses the design and experimental characterization of on-body antennas, which play an essential role within Body Sensor Networks. Four antenna designs were selected from a set of eighteen antenna choices and finally implemented for both passive and active measurements. The issues raised during the process of this work (requirements st...
Article
Full-text available
The purpose of this work is to describe a first approach to a smart bioimpedance spectroscopy device for its application to the estimation of body composition. The proposed device is capable of carrying out bioimpedance measurements in multiple configurable frequencies, processing the data to obtain the modulus and the bioimpedance phase in each of...
Chapter
Rehabilitation treatment of patients with chronic obstructive pulmonary disease (COPD) based on muscle training provides clear benefits in health and quality of life. Its positive effects are usually diminished once the training is over, and the effectiveness of home maintenance programs is limited due to the lack of motivation and adherence of pat...
Chapter
This work presents a model to train medical students in the analysis of different pathologies of the respiratory system. The model allows the simulation of dynamic behaviors of some variables associated with the pulmonary function under diverse physiopathological conditions. Variables such as age, gender, anthropometric factors and lung volumes obt...
Article
Full-text available
This work develops a thorough review of bioimpedance systems for healthcare applications. The basis and fundamentals of bioimpedance measurements are described covering issues ranging from the hardware diagrams to the configurations and designs of the electrodes and from the mathematical models that describe the frequency behavior of the bioimpedan...
Article
Full-text available
In this paper, a first approach to the design of a portable device for non-contact monitoring of respiratory rate by capacitive sensing is presented. The sensing system is integrated into a smart vest for an untethered, low-cost and comfortable breathing monitoring of Chronic Obstructive Pulmonary Disease (COPD) patients during the rest period betw...
Article
Full-text available
Intrabody communication (IBC) is a wireless communication technology using the human body to develop body area networks (BANs) for remote and ubiquitous monitoring. IBC uses living tissues as a transmission medium, achieving power-saving and miniaturized transceivers, making communications more robust against external interference and attacks on th...
Article
Full-text available
This work presents a first approach to the design, development, and implementation of a smart device for the real-time measurement and detection of alterations in heart rate variability (HRV). The smart device follows a modular design scheme, which consists of an electrocardiogram (ECG) signal acquisition module, a processing module and a wireless...
Article
Full-text available
The design and implementation of a framework that facilitates the development of Mobile Health applications to manage the communications with biomedical sensors in compliance with the CEN ISO/IEEE 11073 standard family are presented. The framework includes a set of functional modules that are responsible, among other tasks, of the communication of...
Research
Full-text available
IntraBody communication (IBC) is a promising wireless communication technology for the development of body area networks (BANs) and remote and ubiquitous monitoring. IBC uses the human body as a transmission medium, achieving power-saving and miniaturized transceivers, therefore making communications more robust against interferences and immune to...
Article
Background: Current clinical guidelines recommend nutritional evaluation in respiratory patients. Thanks to bioimpedance it is possible to obtain an estimation of body composition in both normal and disease states, identifying protein and fat reserves. Aim: To compare, in a population of respiratory patients, the two most common methods of analysis...
Chapter
Intrabody Communication (IBC) still poses important technical issues regarding the measurement of pathloss through the human body. In the literature, a number of experimental setups using different measurement equipment and conditions have been proposed, possibly causing the discrepancy observed among results by diverse authors. In addition, the un...
Conference Paper
En este trabajo se propone un método de comunicaciones para la monitorización de pacientes diabéticos basado en el patrón publicador/suscriptor el cual potencia la escalabilidad de dispositivos y usuarios y posee un alto nivel de flexibilidad. Con el fin de realizar una primera validación de la propuesta, se ha implementado un escenario simulado de...
Article
This paper discusses some relevant methodological and implementation experiences acquired during the design and development of an embedded Fall Detection System (FDS), which can be of help in order to develop efficient and safe biomedical software for mobile Health (mHealth). For this purpose, an analysis of concepts like portability and iterative...
Article
Full-text available
Although the roles of body sensor networks (BSNs) are similar to those carried out by the generic wireless sensor networks (WSNs), new solutions must be established to optimize communications for true pervasive biomedical monitoring transparent to the user. In this paper, a proposal of a hardware and software platform for biomedical sensors is perf...
Article
The need for increasingly energyefficient and miniaturized bio-devices for ubiquitous health monitoring has paved the way for considerable advances in the investigation of techniques such as intrabody communication (IBC), which uses human tissues as a transmission medium. However, IBC still poses technical challenges regarding the measurement of th...
Article
Full-text available
Bioimpedance methods are noninvasive, simple and safe techniques for body composition estimation, which is of great interest for the nutritional assessment of patients suffering from Chronic Obstructive Pulmonary Disease (COPD). This work performs a comparative study of the most common bioimpedance analysis methods and their applicability for the n...
Chapter
A different approach is becoming popular nowadays, although it was originally proposed by Zimmerman in 1996. It is based on signal transmission through the human body, called intrabody communication (IBC), and has led to the first definition of Body Area Networks (BANs). This chapter shows the main features of some of the most relevant IBC prototyp...
Article
This paper presents the feasibility study of using a distributed approach for the management of alarms from chronic kidney disease patients. In a first place, the key issues regarding alarm definition, classification and prioritization according to available normalization efforts are analyzed for the main scenarios addressed in hemodialysis. Then,...
Article
Full-text available
This work presents the design, development and implementation of a smart sensor to monitor the respiratory rate. This sensor is aimed at overcoming the drawbacks of other systems currently available in market, namely, devices that are costly, uncomfortable, difficult-to-install, provide low detection sensitivity, and little-to-null patient-to-patie...
Article
This paper presents the feasibility study of using a distributed middleware for the management of infections from Chronic Kidney Disease (CKD) patients. The middleware follows the publish-subscribe pattern, and supports the OMG DDS (Data Distribution Service) standard, which facilitates the real-time monitoring of the distributed information, as we...
Article
Bioimpedance analysis is a simple, safe and noninvasive method for Body Composition Estimation (BCE), which is of great interest for the monitoring of patients on renal replacement therapy. The most featured bioimpedance devices available are based on the bioimpedance spectroscopy technique, the extended Cole model and the Hanai Mixture theory. How...
Article
This paper addresses methods for experimental characterization of active antennas in the context of Body Sensor Networks (BSN). In a previous work, the authors proposed an active antenna design to be used in a biomedical monitoring network, following specifications such as consumption, size and cost minimization. In this work, such an antenna has b...
Article
Galvanic Coupling in Intrabody Communication (IBC) is a technique that couples low-power and low-frequency voltages and currents into the human body, which acts as a transmission medium, and thus constitutes a promising approach in the design of personal health devices. Despite important advances being made during recent years, the investigation of...
Article
One of the main objectives of research into intrabody communication (IBC) is the characterization of the human body as a transmission medium for electrical signals. However, such characterization is strongly influenced by the conditions under which the experiments are performed. In addition, the outcomes reported in the literature vary according to...
Chapter
This chapter develops a thorough review of the methods and techniques used for the analysis of body composition of renal patients based on bioimpedance measurements. The work ranges from the physical principles, to bioelectric models of human body, instrumentation, configurations in the position of electrodes, equations to calculate body compositio...
Chapter
This paper proposes a first approach to multidevice information management developed by a Personal Intelligent Platform (PIP) for pervasive care. This platform must satisfy the specific requirements imposed by the distributed and real-time processing of acquired data from biomedical smart sensors carried by the monitored user. The multi-device mana...
Conference Paper
This paper proposes a processing architecture and a programming framework for the remote and seamless update of the algorithms used in the context of biomedical smart sensors. The generic processing architecture provides, among others, the following facilities to a Body Sensor Network in a seamless way to the user beyond functional modularity: 1) d...
Article
Intrabody Communications (IBC) is a technique that uses the human body as a transmission medium for electri- cal signals, thereby providing an efficient communication cha- nnel for Body Sensor Networks (BSN). Nevertheless, a metho- dology for IBC experimentation that reduces the disparity bet- ween authors' outcomes and helps to develop standardize...
Conference Paper
Intrabody communication (IBC) uses the human body as a transmission medium for electrical signals, providing an efficient channel to interconnect devices in Body Sensor Networks. For IBC galvanic coupling, the signal path is accomplished through two pairs of electrodes deployed on the skin, which suggest the dependence of the attenuation signal on...
Article
This paper presents the hardware and software design and implementation of a low-cost, wearable, and unobstructive intelligent accelerometer sensor for the monitoring of human physical activities. In order to promote healthy lifestyles to elders for an active, independent, and healthy ageing, as well as for the early detection of psychomotor abnorm...
Article
Modeling of intrabody communication (IBC) entails the understanding of the interaction between electromagnetic fields and living tissues. At the same time, an accurate model can provide practical hints toward the deployment of an efficient and secure communication channel for body sensor networks. In the literature, two main IBC coupling techniques...
Article
Intrabody communication (IBC) is a technique that uses the human body as a transmission medium for electrical signals to connect wireless body sensors, e.g., in biomedical monitoring systems. In this paper, we propose a simple, but accurate propagation model through the skin based on a distributed-parameter circuit in order to obtain general expres...
Conference Paper
In this paper, we propose a simple, but accurate propagation model through the skin based on a RGC distributed-parameter circuit that leads to the obtaining of simple and general attenuation expressions for both galvanic and capacitive coupling methods that could assist in the design of Intra-body Communications (IBC) systems. The objective of this...
Conference Paper
In this paper, the major advantages of a distributed processing methodology developed in the context of biomedical sensor networks (BSN) are compared to the most usual wireless communication topology architectures developed in the literature. These advantages are highlighted in the context of a distributed fall detection system developed by the aut...
Article
In this paper, the main results related to a fall detection system are shown by means of a personal server for the control and processing of the data acquired from multiple intelligent biomedical sensors. This server is designed in the context of a telehealthcare system for the elderly, to whom falls represent a high-risk cause of serious injuries,...
Article
The main objective of this work is to perform an optimization methodology of the temporal parameters and operation thresholds (acceleration and energy) for the impact detection in an accelerometer smart sensor. The procedure is based on a sequential approach to values that improve the sensitivity and the specificity of the impact detection. It was...
Conference Paper
In this paper methodological and design issues about the development of a personal platform for the control and processing of data acquired from intelligent biomedical sensors are presented. This platform is designed in the context of a telehealthcare system for the elderly with chronic diseases, and one of its objectives is to monitor and detect f...

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