Alejandro García-Requejo

ORCID: 0000-0002-4955-8852
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About
Contact & Profiles
Research Areas
  • Indoor and Outdoor Localization Technologies
  • Context-Aware Activity Recognition Systems
  • IoT Networks and Protocols
  • IoT and Edge/Fog Computing
  • Underwater Vehicles and Communication Systems
  • Energy Efficient Wireless Sensor Networks
  • Robotics and Sensor-Based Localization
  • Engineering Applied Research
  • Speech and Audio Processing
  • Flow Measurement and Analysis
  • IoT-based Smart Home Systems

Universidad de Alcalá
2021-2024

Cognitive impairment diseases are becoming more and prevalent mainly due to population aging the increase in life expectancy. Sensory monitoring systems may allow people with mild cognitive impairments (MCIs) or at early stages of dementia live home for longer independence security. This work presents a wireless sensor network (WSN) based on wearables that obtains indoor outdoor location step information, reporting them over long-range WAN (LoRaWAN) network. Each wearable (WWS) uses global...

10.1109/jsen.2023.3239980 article EN cc-by IEEE Sensors Journal 2023-01-31

Enabling the elderly to live independently and maintain their quality of life at home for as long possible constitutes a major public health challenge, especially in rural semi-urban environments where access formal care may be difficult. Tracking activity monitoring allows detect when skills daily activities are going down provide timely treatments avoid future complications. This work presents an IoT system based on wearable prototype intended indoor outdoor tracking physical dementia...

10.1109/memea54994.2022.9856450 article EN 2022 IEEE International Symposium on Medical Measurements and Applications (MeMeA) 2022-06-22

10.1109/memea60663.2024.10596910 article EN 2022 IEEE International Symposium on Medical Measurements and Applications (MeMeA) 2024-06-26

Indoor Device-Free Localisation (DFL) systems are receiving increasing attention to replace traditional active ones in some applications, such as those that support independent living for vulnerable people who not able carry sensors. These analyse the influence channel transmission response of certain emitted signals when interacting with human body order locate it. Whereas most widespread DFL make use radio-frequency through Radar, WiFi or BLE (Bluetooth Low Energy) sensors, this work...

10.1109/ipin57070.2023.10332222 article EN 2023-09-25

This work presents an Android application that allows indoor positioning of portable devices, such as mobile phones or tablets, and its smooth transition to outdoors localization. Different technologies methods have been combined for purpose: Global Navigation Satellite Systems (GNSS), Ultrasonic Local Positioning (ULPS), measurements Inertial Measurement Unit (IMU) carried by the user, Graph-Matching techniques. The U-LPSs, composed a set ultrasonic beacons, are placed in areas where higher...

10.1109/ipin51156.2021.9662536 article EN 2021-11-29

This work presents a system for the remote supervision of vulnerable people in their homes and surroundings, to offer both formal informal carers objective information about indoor outdoor location, activity parameters or risky situations. The is based on an open-source wearable, that includes accelerometer step-counting fall detection; BLE technology symbolic location indoors; GNSS sensor positioning; ambient sensors; panic button. Sensory sent cloud wirelessly using LoRa technology, thus...

10.1109/icumt61075.2023.10333103 article EN 2023-10-30
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