High Accuracy 3D Indoor Positioning Using Broadband Ultrasonic Signals. - Sérgio Ivan Lopes; José Manuel Neto Vieira; Daniel Filipe Albuquerque (TrustCom, 2012)

MobiFree: A Set of Electronic Mobility Aids for the Blind. - Sérgio Ivan Lopes; José Manuel Neto Vieira; Óscar F. F. Lopes; Pedro R. M. Rosa; Nuno A. S. Dias (DSAI, 2012)

Characterization of the Near-Far problem in a CDMA-based acoustic localization system. - Teodoro Aguilera; Fernando J. Álvarez; Almudena Sánchez; Daniel Filipe Albuquerque; José Manuel Neto Vieira; Sérgio Ivan Lopes (ICIT, 2015)

Analysis of the perceptual impact of high frequency audio pulses in smartphone-based positioning systems. - Sérgio Ivan Lopes; José M. N. Vieira; Daniel Filipe Albuquerque (ICIT, 2015)

Accurate smartphone indoor positioning using a WSN infrastructure and non-invasive audio for TDoA estimation. - Sérgio Ivan Lopes; José M. N. Vieira; João Reis 003; Daniel Filipe Albuquerque; Nuno Borges Carvalho (Pervasive Mob. Comput., 2015)

Doppler resilient modulation in a CDMA-based acoustic local positioning system. - Daniel Filipe Albuquerque; José Manuel Neto Vieira; Sérgio Ivan Lopes; Teodoro Aguilera; Fernando J. Álvarez (IPIN, 2016)

High energy OFDM pulse design algorithm for acoustic ToF ranging and localization. - Daniel Filipe Albuquerque; José Manuel Neto Vieira; Sérgio Ivan Lopes; Teodoro Aguilera; Fernando J. Álvarez (IPIN, 2016)

Ubiquitous Environmental Monitoring as Decision Tool - MONITAR SENSE: An Environmental Tool. - Paulo Pinho; Sérgio Ivan Lopes; Gabriel Rodrigues; Pedro Colaço (SMARTGREENS, 2017)

Design of Compact LoRa Devices for Smart Building Applications. - Sérgio Ivan Lopes; Felisberto Pereira; José M. N. Vieira; Nuno Borges Carvalho; António Curado (GreeNets, 2018)

On the design of a Human-in-the-Loop Cyber-Physical System for online monitoring and active mitigation of indoor Radon gas concentration. - Sérgio Ivan Lopes; António Miguel Rosado da Cruz; Pedro Miguel Moreira; Carlos Abreu; Joaquim P. Silva; Nuno Lopes 001; José M. N. Vieira; António Curado (ISC2, 2018)

RnMonitor: a WebGIS-based platform for expedite in situ deployment of IoT edge devices and effective Radon Risk Management. - Sérgio Ivan Lopes; Pedro Miguel Moreira; António M. Cruz; Pedro Martins; Felisberto Pereira; António Curado (ISC2, 2019)

Design of a Cost-Effective Multimodal IoT Edge Device for Building Occupancy Estimation. - Felisberto Pereira; Sérgio Ivan Lopes; Nuno Borges Carvalho (ISC2, 2019)

Short-Term Indoor Radon Gas Study in a Granitic School Building: A Comparative Analysis of Occupation Periods. - Rolando Azevedo; Joaquim P. Silva; Nuno Lopes 001; António Curado; Sérgio Ivan Lopes (SmartCity360°, 2019)

A Visual Analytics Approach for Effective Radon Risk Perception in the IoT Era. - Sérgio Ivan Lopes; Sanne Bogers; Pedro Miguel Moreira; António Curado (SmartCity360°, 2019)

RnMonitor: An IoT-Enabled Platform for Radon Risk Management in Public Buildings. - Pedro Martins; Sérgio Ivan Lopes; Felisberto Pereira; António Curado (SmartCity360°, 2019)

Low-Cost LoRa-Based IoT Edge Device for Indoor Air Quality Management in Schools. - António Abreu; Sérgio Ivan Lopes; Vitor Manso; António Curado (SmartCity360°, 2020)

RnProbe: A LoRa-Enabled IoT Edge Device for Integrated Radon Risk Management. - Felisberto Pereira; Sérgio Ivan Lopes; Nuno Borges Carvalho; António Curado (IEEE Access, 2020)

Challenges in Resource-Constrained IoT Devices: Energy and Communication as Critical Success Factors for Future IoT Deployment. - Felisberto Pereira; Ricardo Correia 003; Pedro Pinho; Sérgio Ivan Lopes; Nuno Borges Carvalho (Sensors, 2020)

Fostering Sustainability on Campus: Design of an IoT-Enabled Smartbottle for Plastic Reduction in the Academic Environment. - João Mendes; Ana Filomena Curralo; António Curado; Sérgio Ivan Lopes (AHFE (19), 2021)

Crowd Quantification with Flow Direction Estimation: a Low-Cost IoT-enabled Solution. - Ricardo Santil; Bruno Gomes; Sara Paiva; Sérgio Ivan Lopes (GCAIoT, 2021)

Evaluation of a Low-Cost COTS Bio Radar for Vital Signs Monitoring. - Fábio Silva; Rita Almeida; Pedro Pinho; Paulo Marques; Sérgio Ivan Lopes (ISC2, 2021)

Improvement of RSSI-Based LoRaWAN Localization Using Edge-AI. - Azin Moradbeikie; Ahmad Keshavarz; Habib Rostami; Sara Paiva; Sérgio Ivan Lopes (SmartCity360°, 2021)

Identification and Classification of Human Body Parts for Contactless Screening Systems: An Edge-AI Approach. - Diogo Rocha; Pedro Rocha; Jorge Ribeiro 001; Sérgio Ivan Lopes (SmartCity360°, 2021)

Security in V2X Communications: A Comparative Analysis of Simulation/Emulation Tools. - João Silva; Luis Barreto; Sérgio Ivan Lopes (SmartCity360°, 2021)

Assessment of Low-Cost Infrared Thermography Systems for Medical Screening in Nursing Homes. - Bruno Braga; Gabriel Queirós; Carlos Abreu; Sérgio Ivan Lopes (WiMob, 2021)

Contactless Smart Screening in Nursing Homes: an IoT-enabled solution for the COVID-19 era. - Sérgio Ivan Lopes; Pedro Pinho; Paulo Marques; Carlos Abreu; Nuno Borges Carvalho; José Ferreira (WiMob, 2021)

Designing a FIWARE-Based Smart Campus with IoT Edge-Enabled Intelligence. - Pedro Martins; Sérgio Ivan Lopes; António Curado (WorldCIST (3), 2021)

Green IoT and Edge AI as Key Technological Enablers for a Sustainable Digital Transition towards a Smart Circular Economy: An Industry 5.0 Use Case. - Paula Fraga-Lamas; Sérgio Ivan Lopes; Tiago M. Fernández-Caramés (Sensors, 2021)

Wearables and Internet of Things (IoT) Technologies for Fitness Assessment: A Systematic Review. - João Passos; Sérgio Ivan Lopes; Filipe Manuel Clemente; Pedro Miguel Moreira; Markel Rico-González; Pedro Bezerra; Luís Paulo Rodrigues (Sensors, 2021)

Low-cost traffic sensing system based on LoRaWAN for urban areas. - Hannaneh Barahouei Pasandi; Asma Haqiqat; Azin Moradbeikie; Ahmad Keshavarz; Habib Rostami; Sara Paiva; Sérgio Ivan Lopes (EmergingWireless@CoNEXT, 2022)

Towards Indoor Radon Analytics: An OLAP-based Multidimensional Approach. - Rolando Azevedo; Joaquim P. Silva; Nuno Lopes 001; António Curado; Leonel J. R. Nunes; Sérgio Ivan Lopes (DATA, 2022)

Exploiting Physical Layer Vulnerabilities in LoRaWAN-based IoT Networks. - Nuno Torres; Pedro Pinto 001; Sérgio Ivan Lopes (WF-IoT, 2022)

A Cost-effective Infrared Thermographic System for Diabetic Foot Screening. - André Rocha; Sérgio Ivan Lopes; Carlos Abreu (WiMob, 2022)

Low-Cost Traffic Sensing System Based on LoRaWAN for Urban Areas. - Hannaneh Barahouei Pasandi; Asma Haghighat; Azin Moradbeikie; Ahmad Keshavarz; Habib Rostami; Sara Paiva; Sérgio Ivan Lopes (CoRR, 2022)

A Hybrid Framework for Visual Positioning: Combining Convolutional Neural Networks with Ontologies. - Abdolreza Mosaddegh; Sérgio Ivan Lopes; Habib Rostami; Ahmad Keshavarz; Sara Paiva (EAI Endorsed Trans. Energy Web, 2022)

Mist and Edge Computing Cyber-Physical Human-Centered Systems for Industry 5.0: A Cost-Effective IoT Thermal Imaging Safety System. - Paula Fraga-Lamas; Daniel Barros; Sérgio Ivan Lopes; Tiago M. Fernández-Caramés (Sensors, 2022)

Hybrid Building Occupancy Estimation using Thermal Imaging and Environmental Sensing. - Daniel Barros; António M. R. Da Cruz; Sérgio Ivan Lopes (ICIT, 2023)

Improving BLE Fingerprint Radio Maps: A Method based on Fuzzy Clustering and Weighted Interpolation. - Hannaneh Barahouei Pasandi; Azin Moradbeikie; Daniel Barros; David Verde; Sara Paiva; Sérgio Ivan Lopes (IIoT-NETs@SIGCOMM, 2023)

RELIANCE: A Reliable and Power Efficient LoRaWAN Optimization Approach for IoT Systems. - Ebrahim Darabi; Azin Moradbeikie; Ahmad Keshavarz; Sérgio Ivan Lopes (WF-IoT, 2023)

Improving LoRaWAN Fingerprint-Based Localization by Detecting and Eliminating Noisy RSSI Measurements. - Asma Haghighat; Zahra Sirous; Azin Moradbeikie; Ahmad Keshavarz; Sérgio Ivan Lopes (WF-IoT, 2023)

Adopting Industry 4.0 and Lean Practices in Heavy Metalworking: Impact of Human Factors on Productivity. - Cristiano Jesus; Eduardo Pontes; Rui M. Lima; Sérgio Ivan Lopes (WorldCIST (3), 2023)

A cost-effective LoRaWAN-based IoT localization method using fixed reference nodes and dual-slope path-loss modeling. - Azin Moradbeikie; Ahmad Keshavarz; Habib Rostami; Sara Paiva; Sérgio Ivan Lopes (Internet Things, 2023)

Predictive Technologies and Methodologies for Human Operator Assessment in Industry 5.0: A Conceptual Framework. - Marco Martinelli 003; Sérgio Ivan Lopes; Mauro Migliardi (ETFA, 2024)

RSSI-Based Localization in Industrial Environments: A Wi-Fi/BLE Hybrid Approach. - Azin Moradbeikie; Rolando Azevedo; Cristiano Jesus; Sérgio Ivan Lopes (ICIT, 2024)

An Overview of Blockchain for Industry 5.0: Towards Human-Centric, Sustainable and Resilient Applications. - Paula Fraga-Lamas; Tiago M. Fernández-Caramés; António Miguel Rosado da Cruz; Sérgio Ivan Lopes (IEEE Access, 2024)

CoViS: A Contactless Health Monitoring System for the Nursing Home. - Sérgio Ivan Lopes; Fábio Silva; Pedro Pinho; Paulo Marques; Carlos Abreu; João Milheiro; Bruno Braga; Gabriel Queirós; Rita Almeida; Nuno Borges Carvalho (IEEE Access, 2024)

Towards a Blockchain and Opportunistic Edge Driven Metaverse of Everything. - Paula Fraga-Lamas; Sérgio Ivan Lopes; Tiago M. Fernández-Caramés (CoRR, 2024)

A Cost-Effective Thermal Imaging Safety Sensor for Industry 5.0 and Collaborative Robotics. - Daniel Barros; Paula Fraga-Lamas; Tiago M. Fernández-Caramés; Sérgio Ivan Lopes (CoRR, 2024)

IoT Architectures for Indoor Radon Management: A Prospective Analysis. - Óscar Blanco-Novoa; Paulo Barros; Paula Fraga-Lamas; Sérgio Ivan Lopes; Tiago M. Fernández-Caramés (CoRR, 2024)

Enhancing LoRaWAN Localization in Industrial Environments: Merging Path-Loss Modeling, Extended Kalman Filtering and Map-Matching. - Azin Moradbeikie; Ahmad Keshavarz; Sérgio Ivan Lopes (IEEE Access, 2025)