1. “Ventilation Diagnosis of Angle Grinder Using Thermal Imaging”
by Adam Glowacz
Sensors 2021, 21(8), 2853; https://doi.org/10.3390/s21082853
Available online: https://www.mdpi.com/1424-8220/21/8/2853

2. “LSTM Networks Using Smartphone Data for Sensor-Based Human Activity Recognition in Smart Homes”
by Sakorn Mekruksavanich and Anuchit Jitpattanakul
Sensors 2021, 21(5), 1636; https://doi.org/10.3390/s21051636
Available online: https://www.mdpi.com/1424-8220/21/5/1636

3. “A Modified Sparrow Search Algorithm with Application in 3d Route Planning for UAV”
by Guiyun Liu, Cong Shu, Zhongwei Liang, Baihao Peng and Lefeng Cheng
Sensors 2021, 21(4), 1224; https://doi.org/10.3390/s21041224
Available online: https://www.mdpi.com/1424-8220/21/4/1224

4. “Predictive Maintenance and Intelligent Sensors in Smart Factory: Review”
by Martin Pech, Jaroslav Vrchota and Jiří Bednář
Sensors 2021, 21(4), 1470; https://doi.org/10.3390/s21041470
Available online: https://www.mdpi.com/1424-8220/21/4/1470

5. “Roadmap of Terahertz Imaging 2021”
by Gintaras Valušis, Alvydas Lisauskas, Hui Yuan, Wojciech Knap and Hartmut G. Roskos
Sensors 2021, 21(12), 4092; https://doi.org/10.3390/s21124092
Available online: https://www.mdpi.com/1424-8220/21/12/4092

6. “Deep Learning-Based Industry 4.0 and Internet of Things towards Effective Energy Management for Smart Buildings”
by Mahmoud Elsisi, Minh-Quang Tran, Karar Mahmoud, Matti Lehtonen and Mohamed M. F. Darwish
Sensors 2021, 21(4), 1038; https://doi.org/10.3390/s21041038
Available online: https://www.mdpi.com/1424-8220/21/4/1038

7. “Reliable Industry 4.0 Based on Machine Learning and IoT for Analyzing, Monitoring, and Securing Smart Meters”
by Mahmoud Elsisi, Karar Mahmoud, Matti Lehtonen, and Mohamed M. F. Darwish
Sensors 2021, 21(2), 487; https://doi.org/10.3390/s21020487
Available online: https://www.mdpi.com/1424-8220/21/2/487

8. “Impact of COVID-19 on IoT Adoption in Healthcare, Smart Homes, Smart Buildings, Smart Cities, Transportation and Industrial IoT”
by Muhammad Umair, Muhammad Aamir Cheema, Omer Cheema, Huan Li and Hua Lu
Sensors 2021, 21(11), 3838; https://doi.org/10.3390/s21113838  
Available online: https://www.mdpi.com/1424-8220/21/11/3838

9. “AI-Driven Framework for Recognition of Guava Plant Diseases through Machine Learning from DSLR Camera Sensor Based High Resolution Imagery”
by Ahmad Almadhor, Hafiz Tayyab Rauf, Muhammad Ikram Ullah Lali, Robertas Damaševičius, Bader Alouffi and Abdullah Alharbi
Sensors 2021, 21(11), 3830; https://doi.org/10.3390/s21113830
Available online: https://www.mdpi.com/1424-8220/21/11/3830

10. “An Overview of Autonomous Vehicles Sensors and Their Vulnerability to Weather Conditions”
by Jorge Vargas, Suleiman Alsweiss, Onur Toker, Rahul Razdan and Joshua Santos
Sensors 2021, 21(16), 5397; https://doi.org/10.3390/s21165397
Available online: https://www.mdpi.com/1424-8220/21/16/5397