1. From the Editor-in-Chief

   • Kimon P. Valavanis

   Editorial 30 April 2021 Article: 28

2. Formation Reconfiguration for Fixed-Wing UAVs

   • Hao Chen
   • Xiangke Wang
   • Yangguang Yu

   Regular Paper 30 April 2021 Article: 27

3. The MRS UAV System: Pushing the Frontiers of Reproducible Research, Real-world Deployment, and Education with Autonomous Unmanned Aerial Vehicles

   • Tomas Baca
   • Matej Petrlik
   • Martin Saska

   Regular Paper 30 April 2021 Article: 26

4. Robot Speed Adaption in Multiple Trajectory Planning and Integration in a Simulation Tool for Human-Robot Interaction

   • Paul Glogowski
   • Alexander Böhmer
   • Bernd Kuhlenkötter

   Regular Paper Open access 30 April 2021 Article: 25

5. Unmanned Aircraft Systems Performance in a Climate-Controlled Laboratory

   • Matteo Scanavino
   • Arrigo Avi
   • Giorgio Guglieri

   Regular Paper Open access 27 April 2021 Article: 24

6. Energy Consumption of Control Schemes for the Pioneer 3DX Mobile Robot: Models and Evaluation

   • Lotfi Jaiem
   • Didier Crestani
   • Sébastien Druon

   Regular Paper 27 April 2021 Article: 23

7. An Optimization Approach to Minimize the Expected Loss of Demand Considering Drone Failures in Drone Delivery Scheduling

   • Maryam Torabbeigi
   • Gino J. Lim
   • Seon Jin Kim

   Regular Paper 27 April 2021 Article: 22

8. Estimating Obstacle Maps for USVs Based on a Multistage Feature Aggregation and Semantic Feature Separation Network

   • Jingyi Liu
   • Hengyu Li
   • Yu Sun

   Regular Paper 24 April 2021 Article: 21

9. KIcker: An Industrial Drive and Control Foosball System automated with Deep Reinforcement Learning

   • Stefano De Blasi
   • Sebastian Klöser
   • Timo Zerrer

   Short Paper 24 April 2021 Article: 20

10. Single Pilot Operations IN Commercial Cockpits: Background, Challenges, and Options

    • Paul L. Myers III
    • Arnold W. Starr Jr

    Regular Paper 24 April 2021 Article: 19

11. An Embedded Quaternion-Based Extended Kalman Filter Pose Estimation for Six Degrees of Freedom Systems

    • Rodrigo Alves Medeiros
    • Guilherme Araujo Pimentel
    • Rafael Garibotti

    Regular Paper 22 April 2021 Article: 18

12. sBotics - Gamified Framework for Educational Robotics

    • Lucas Moura do Nascimento
    • Davi Souto Neri
    • Sarah Thomaz de Lima Sá

    Regular Paper 22 April 2021 Article: 17

13. Nonlinear Model Predictive Path Following Controller with Obstacle Avoidance

    • Ignacio Sánchez
    • Agustina D’Jorge
    • Antonio Ferramosca

    Regular Paper 20 April 2021 Article: 16

14. Composite Anti-Disturbance Reference Model L₂-\(L_{\infty }\) Control for Helicopter Slung Load System

    • Lijun Liu
    • Mou Chen
    • Huijiao Wang

    Regular Paper 20 April 2021 Article: 15

15. Whole-Body Teleoperation and Shared Control of Redundant Robots with Applications to Aerial Manipulation

    • Andre Coelho
    • Yuri Sarkisov
    • Christian Ott

    Regular Paper Open access 20 April 2021 Article: 14

16. Designs of the Biomimetic Robotic Fishes Performing Body and/or Caudal Fin (BCF) Swimming Locomotion: A Review

    • Fengran Xie
    • Qiyang Zuo
    • Zheng Li

    Review Paper 19 April 2021 Article: 13

17. SDP-Based Robust Formation-Containment Coordination of Swarm Robotic Systems with Input Saturation

    • Kefan Wu
    • Junyan Hu
    • Farshad Arvin

    Short Paper Open access 19 April 2021 Article: 12

18. Kinematic Cooperative Optimization Control Algorithm for Underground Heavy-Load Robot

    • Lixia Fang
    • Tong Wang
    • Miao Wu

    Regular Paper Open access 19 April 2021 Article: 11

19. Multi-Robot Coordination Analysis, Taxonomy, Challenges and Future Scope

    • Janardan Kumar Verma
    • Virender Ranga

    Review Paper 16 April 2021 Article: 10

20. A review: A Comprehensive Review of Soft and Rigid Wearable Rehabilitation and Assistive Devices with a Focus on the Shoulder Joint

    • Hamed Majidi Fard Vatan
    • Samia Nefti-Meziani
    • Haitham El-Hussieny

    Review Paper Open access 16 April 2021 Article: 9

21. Non-cascade Adaptive Sliding Mode Control for Quadrotor UAVs under Parametric Uncertainties and External Disturbance with Indoor Experiments

    • Tiehua Wang
    • Hardik Parwana
    • Fumitoshi Matsuno

    Short Paper 16 April 2021 Article: 8

22. Lightweight Density Map Architecture for UAVs Safe Landing in Crowded Areas

    • Javier Antonio Gonzalez-Trejo
    • Diego A. Mercado-Ravell

    Regular Paper 15 April 2021 Article: 7

23. Sensitivity Study of Design Parameters for a Fuel Cell Powered Multirotor Drone

    • Jørgen Apeland
    • Dimitrios G. Pavlou
    • Tor Hemmingsen

    Regular Paper Open access 15 April 2021 Article: 6

24. Analysis of Methods for Incremental Policy Refinement by Kinesthetic Guidance

    • Mihael Simonič
    • Tadej Petrič
    • Bojan Nemec

    Regular Paper Open access 15 April 2021 Article: 5

25. Interval Inspired Approach Based on Temporal Sequence Constraints to Place Recognition

    • Renata Neuland
    • Fernanda Rodrigues
    • Edson Prestes

    Regular Paper 14 April 2021 Article: 4

26. MeWBots: Mecanum-Wheeled Robots for Collaborative Manipulation in an Obstacle-Clustered Environment Without Communication

    • Aditya Rauniyar
    • Hem Chandra Upreti
    • Prabhu Sethuramalingam

    Short Paper 13 April 2021 Article: 3

27. DARE-SLAM: Degeneracy-Aware and Resilient Loop Closing in Perceptually-Degraded Environments

    • Kamak Ebadi
    • Matteo Palieri
    • Ali-akbar Agha-mohammadi

    Regular Paper 09 April 2021 Article: 2

28. Event-MILP-Based Task Allocation for Heterogeneous Robotic Sensor Network for Thermosolar Plants

    • Javier G. Martin
    • Ramon A. García
    • Eduardo F. Camacho

    Short Paper 08 April 2021 Article: 1