Diego P. Morales

Diego P. Morales
University of Granada | UGR · Department of Electronics and Computer Technology

Tenured Professor

About

136
Publications
31,510
Reads
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1,191
Citations
Citations since 2017
101 Research Items
976 Citations
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Introduction
Diego P. Morales currently works at the Department of Electronics and Computer Technology, University of Granada. Diego does research in Electronic Engineering, Bioengineering and Computer Engineering. Their current project is 'Reconfigurable flexible instrumentation'. Diego belongs to the Biochemistry and Electronics as Sensing Technologies research group (BEST research group)
Additional affiliations
October 2006 - present
Universidad de Granada
October 2006 - present
University of Granada
Position
  • Professor (Associate)
November 2001 - September 2006
Universidad de Almería

Publications

Publications (136)
Article
Full-text available
Citation: Mauro, G.; De Carlos Diez, M.; Ott, J.; Servadei, L.; Cuellar, M.P.; Morales-Santos, D.P. Few-Shot User-Adaptable Radar-Based Breath Signal Sensing. Sensors 2023, 23, 804. Abstract: Vital signs estimation provides valuable information about an individual's overall health status. Gathering such information usually requires wearable devices...
Article
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This paper presents a low-cost, self-recoverable, double-node upset tolerant latch aiming at nourishing the lack of these devices in the state of the art, especially featuring self-recoverability while maintaining a low-cost profile. Thus, this D-latch may be useful for high reliability and high-performance safety-critical applications as it can de...
Article
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Hardware Security Modules (HSM) serve as a hardware based root of trust that offers physical protection while adding a new security layer in the system architecture. When combined with decentralized access technologies as Blockchain, HSM offers robustness and complete reliability enabling secured end-to-end mechanisms for authenticity, authorizatio...
Article
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Functional nanomaterials have become one of the most fascinating fields in nanotechnology [...]
Article
The extensive use of smartphones with point-of-care (POC) applications has boosted the development of what is commonly known as Healthcare 4.0. The ability to track biomarker parameters has become a critical part of monitoring the progression of certain diseases, with a potential application in a large population group. In this line, this work pres...
Article
There is a growing interest in pushing computation to the Edge, especially the problem-solving abilities of Artificial Neural Networks (ANNs). This paper presents a simplified method to obtain a Ternary Neural Network based on the Multilayer Perceptron. The method is focused on resource-constrained devices, where memory, computing power, and batter...
Article
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In this work a versatile hardware platform based on reconfigurable devices is presented. This platform it intended for the acquisition of multiple biosignals, only requiring a reconfiguration to switch applications. This prototype has been combined with graphene-based, flexible electrodes to cover the application to different biosignals presented i...
Article
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This paper presents and implements a novel remote attestation method to ensure the integrity of a device applicable to decentralized infrastructures, such as those found in common edge computing scenarios. Edge computing can be considered as a framework where multiple unsupervised devices communicate with each other with lack of hierarchy, requesti...
Article
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Two novel metal-organic frameworks (MOFs), based on dysprosium as the metal and the 5-aminoisophthalic acid (5aip) ligand, have been solvothermally synthesized, with the aim of studying and modulating their luminescence properties according to the variation of solvent in the structure. These materials display intense photo-luminescence properties i...
Article
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This case report presents a real example of a study which introduces the use of reconfig- urable platforms in the teaching of electronics engineering to establish a bridge between theory and practice. This gap is one of the major concerns of the electronics engineering students. Different strategies, such as simulation tools or breadboard implement...
Article
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Technological advances and scalability are leading Human-Computer Interaction (HCI) to evolve towards intuitive forms, such as through gesture recognition. Among the various interaction strategies, radar-based recognition is emerging as a touchless, privacy-secure, and versatile solution in different environmental conditions. Classical radar-based...
Article
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Herein, we present the syntheses of a novel coordination polymer (CP) based on the perylene-3,4,9,10-tetracarboxylate (pery) linkers and sodium metal ions. We have chosen sodium metal center with the aim of surmising the effect that the modification of the metal ion may have on the relative humidity (RH) experimental measurements of the material. W...
Article
The name Edge Intelligence , also known as Edge AI , is a recent term used in the last few years to refer to the confluence of Machine Learning, or broadly speaking Artificial Intelligence, with Edge Computing. In this manuscript, we revise the concepts regarding Edge Intelligence, such as Cloud, Edge and Fog Computing, the motivation to use Edge I...
Article
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The recent release of the standard USB-PD 3.1 specifies variable output voltages from 5 V to 48 V featuring a step forward towards a universal adaptor but rising new challenges for the converter topologies used up to now. In such applications, a first AC-DC stage is followed by a DC-DC stage. In this paper, emerging WBG technologies are applied to...
Thesis
Full-text available
MOTIVATION AND OBJECTIVES The power supplies or power converters are required in many applications to convert between the AC of the distribution grid to AC or DC at different voltage and current levels required by the electric loads. Each applica-tion may include different conversion steps and at different voltage levels. In every conversion step...
Article
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The interfaces between users and systems are evolving into a more natural communication, including user gestures as part of the interaction, where air-writing is an emerging application for this purpose. The aim of this work is to propose a new air-writing system based on only one array of ultrasonic transceivers. This track will be obtained based...
Article
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The switching loss of the secondary side rectifiers in LLC resonant converters can have a noticeable impact on the overall efficiency of the complete power supply and constrain the upper limit of the optimum switching frequencies of the converter. Two are the main contributions to the switching loss in the secondary side rectifiers: on the one hand...
Article
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This work studies the feasibility of a novel two-step algorithm for infrastructure and object positioning, using pairwise distances. The proposal is based on the optimization algorithms, Scaling-by-Majorizing-a-Complicated-Function and the Limited-Memory-Broyden-FletcherGoldfarb-Shannon. A qualitative evaluation of these algorithms is performed for...
Conference Paper
Recent market trends are shaping the direction of power adaptors development. On the one hand, USB-PD standard [1] that allows the reuse of power adaptors for multiple devices, thus reducing the electronic waste generated [2]; on the other hand, fast battery charging features for mobile devices bring the need for higher adaptor power levels, result...
Conference Paper
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In this paper, the design of a new complete power supply for server applications is discussed. The main constraints of the new solution are the very high peak efficiency, the long holdup time and the maximum outer dimension. The PSU is comprised of a front-end ACDC bridgeless totem-pole PFC and a back-end DCDC half-bridge LLC. Due to the extended h...
Patent
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Método, dispositivo y sistema para el almacenamiento, la codificación y la decodificación de información basada en códigos con capacidad de detección de errores. Se describe un dispositivo compuesto por al menos dos capas, una de las cuales es invariante y contiene un código visual con capacidad de corregir errores, y al menos una capa que es varia...
Article
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There have been significant advances regarding target detection in the autonomous vehicle context. To develop more robust systems that can overcome weather hazards as well as sensor problems, the sensor fusion approach is taking the lead in this context. Laser Imaging Detection and Ranging (LiDAR) and camera sensors are two of the most used sensors...
Article
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Data acquisition and treatment are key issues for any Deep Learning (DL) technique, especially in computer vision tasks. A big effort must be done for the creation of labeled datasets, due to the time this task requires and its complexity in cases where different sensors must be used. This is the case of radar imaging applications, where radar data...
Article
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In 1971, Prof. L. Chua theoretically introduced a new circuit element, which exhibited a different behavior from that displayed by any of the three known passive elements: the resistor, the capacitor or the inductor. This element was called memristor, since its behavior corresponded to a resistor with memory. Four decades later, the concept of mem-...
Article
In this article, a power converter based on an asymmetrical half-bridge flyback topology is analyzed and optimized for small form factor and fast-charging power adaptors. Two resonant control methods, taking advantage of the forward and flyback characteristics of the converter, as well as the benefits of each of them depending of the operation poin...
Article
CNT-Based RC networks are described with the purpose of showing empirical findings on the influence of the interdigitated electrodes (IDE) spacing, the dispersant compound and the number of deposited layers, on the impedance magnitude and phase of the CNTs. Additionally, we propose use-cases for these networks, applying them to the realization of f...
Article
Full-text available
The aim of this work is to prove that it is possible to develop a system able to detect gestures based only on ultrasonic signals and Edge devices. A set of 7 gestures plus idle has been defined, being possible to combine them to increase the recognized gestures. In order to recognize them, Ultrasound transceivers will be used to detect the 2 dimen...
Article
In this communication we present the design, simulation and implementation of a floating flux-controlled meminductor emulator based on the Riordan gyrator. Firstly, the circuit is presented theoretically, from its original version to emulate inductors to its adaptation for floating meminductors. Once its theoretical equations are presented, using S...
Article
We report a simple, rapid, low-resource and one-step method for formation of fluorescent silicon nanodots (SNDs) in a microfluidic paper-based analytical device (µPAD) incorporated in a reusable, portable and flexible heater for determination of total carbohydrates. The synthesis of SNDs is based on the redox reaction between (3-aminopropyl) trieth...
Conference Paper
Salivary pH is one of the indicators of the dental health of a person. To enable fast and easy dental health observations, we developed a flexible capacitive pH sensor using graphene oxide (GO) sensing layer on the laser-induced graphene (LIG) electrode produced from a polyimide (PI) film acting both as LIG precursor material and substrate. Cyclic...
Conference Paper
Laser reduced graphene oxide (LrGO) has been considered as temperature sensor and its thermal sensitivity has been studied as a function of the reduction laser power level. To do so, LrGO squares of 1 cm 2 on a flexible substrate have been fabricated. We found that for the lower tested power (50 mW), both the nominal resistance (about 500 Ω) and te...
Article
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In this letter, we present the extension of a previous work on a cost-effective method for fabricating highly sensitive humidity sensors on flexible substrates with a reversible response, allowing precise monitoring of the humidity threshold. In that work we demonstrated the use of three-dimensional metal-organic framework (MOF) film deposition bas...
Article
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This work presents an innovative application of carbon dots (Cdots) nanoparticles as sensing layer for relative humidity detection. The developed sensor is based on interdigitated capacitive electrodes screen printed on a flexible transparent polyethylene terephthalate (PET) film. Cdots are deposited on top of these electrodes. An exhaustive charac...
Article
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Although the number of Internet of Things devices increases every year, efforts to decrease hardware energy demands and to improve efficiencies of the energy-harvesting stages have reached an ultra-low power level. However, no current standard of wireless communication protocol (WCP) can fully address those scenarios. Our focus in this paper is to...
Article
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This work demonstrates a cost-effective manufacturing method of flexible and fully printed microheaters, using carbon nanotubes (CNTs) as the heating element. Two different structures with different number of CNT layers have been characterized in detail. The benchmarking has been carried out in terms of maximum operating temperature, as well as nom...
Article
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RF energy harvesting (RFEH) has recently become part of the alternatives for powering wireless sensor networks. Our focus in this paper was to introduce a design, MSwitch, able to use off-the-shelf dc/dc converters for running a real and self-powered Internet of Things (IoT) application. MSwitch is an RF dual-band energy harvesting stage employing...
Article
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In this work, we presented the design and simulation of a new flux-controlled meminductor emulator based on a modified version of the well-known Antoniou’s inductor simulator circuit. The constitutive theoretical equations of meminductance are presented and subsequently correlated with the electrical behavior of Antoniou’s circuit, hence illustrati...
Article
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In this paper flexible printed electrodes applicable to wearable electronics are presented. Using innovative materials as Laser Induced Graphene (LIG) and printed electronics, three type of electrodes based in LIG, silver chloride and carbon inks have been compared during the acquisition of bipotentials as electrocardiogram, electromyogram and elec...
Article
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Herein we present, for the first time, a 2D-MOF based on copper and 4-hydroxypyrimidine-5-carbonitrile as linker. Each MOF layer is perfectly flat and neutral, as is the case for graphene. High pressure X-Ray diffraction measurements reveal that such layered structure can be modulated between 3.01 to 2.78 Å interlayer separation, with an evident pi...
Article
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The parasitic capacitances of modern Si SJ MOSFETs are characterized by their non-linearity. At high voltages the total stored energy Eoss(VDC) in the output capacitance Coss(v) differs substantially from the energy in an equivalent linear capacitor Coss(tr) storing the same amount of charge. That difference requires the definition of an additional...
Article
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In this paper, we present a comparative study of a cost-effective method for the mass fabrication of electrodes to be used in thin-film flexible supercapacitors. This technique is based on the laser-synthesis of graphene-based nanomaterials, specifically, laser-induced graphene and reduced graphene oxide. The synthesis of these materials was perfor...
Article
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A portable reconfigurable platform for hemoglobin determination based on inner filter quenching of room-temperature phosphorescent carbon dots (CDs) in the presence of H2O2 is described. The electronic setup consists of a light-emitting diode (LED) as the carbon dot optical exciter and a photodiode as a light-to-current converter integrated in the...
Conference Paper
This work presents a novel approach for the fabrication of Electrochemical Capacitors (ECs) based on the screen-printing of a commercial carbon-based conductive ink on flexible substrates. This technique enables the fast and cost-effective production of ECs with high flexibility and outstanding performance over bending states and voltage cycling, a...
Conference Paper
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The irruption of Internet of Things and 5G in our society comes along with several technological challenges to overcome. From an overall perspective, the low-cost and environmental friendliness of these technologies need to be ensured for their universal deployment in different areas, starting with the sensors and finishing with the power sources....
Article
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Radio frequency identification (RFID) security is a relevant matter. The wide spread of RFID applications in the general society and the persistent attempts to safeguard it confirm it, especially since its use involves payments and the store or transmission of sensitive information. In this contribution, we present an innovative solution for improv...
Article
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In this paper, we present a simple, fast, and cost-effective method for the large-scale fabrication of high-sensitivity humidity sensors on flexible substrates. These sensors consist of a micro screen-printed capacitive structure upon which a sensitive layer is deposited. We studied two different structures and three different sensing materials by...
Article
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The search and investigation of resistive switching materials, the most consolidated form of solid-state memristors, has become one of the fastest growing areas in the field of electronics. This is not only due to the huge commercial interest in developing the so-called Resistive Random-Access Memories (ReRAMs) but also because resistive switching...
Article
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Flexible electronics is one of the fundamental technologies for the development of electronic skin, implant wearables, or ubiquitous biosensing. In this context, graphene-derived materials have attracted great interest due to their unique properties to fulfill the demands of these applications. Here we report a simple one-step method for the fabric...
Article
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The requirements for the blocking voltage of the rectification devices on the secondary side of Phase Shift Full Bridge DCDC converter topology are, by nature, higher than for other quasi-resonant or fully resonant topologies (DAB, LLC). This is especially aggravated in wide range operation converters and further increased by the rectifiers' drain...
Article
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The phase shift full bridge (PSFB) is a widely known isolated DC-DC converter topology commonly used in medium to high power applications, and one of the best candidates for the front-end DC-DC converter in server power supplies. Since the server power supplies consume an enormous amount of power, the most critical issue is to achieve high efficien...
Article
Full-text available
In this paper, we present a simple and inexpensive method for the fabrication of high-performance graphene-based heaters on different large-scale substrates through the laser photothermal reduction of graphene oxide (laser-reduced graphene-oxide, LrGO). This method allows an efficient and localized high level of reduction and therefore a good elect...
Article
This work presents a novel algorithm for the measurement of resistive-type gas sensors with carbon nanotubes (CNTs) as sensitive layer. Contrary to conventional strategies, which extract the sensor information from the normalized resistance, the proposed algorithm is based on the variation in resistance over time. The results have demonstrated that...
Article
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This paper proposes a novel modulation technique for the bidirectional operation of the Phase Shift Full Bridge (PSFB) DC/DC power converter. The forward or buck operation of this topology is well known and widely used in medium to high power DC to DC converters. In contrast, backward or boost operation is less typical since it exhibits large drain...