1. From the Editor-in-Chief

   • Kimon P. Valavanis

   Editorial 29 July 2021 Article: 89

2. ICAR 2019 Special Issue

   • Guilherme A. S. Pereira
   • Paulo L. J. Drews Jr.
   • Leonardo S. Mattos

   GUEST EDITORIAL 23 July 2021 Article: 88

3. Evaluation of ROS Navigation Stack for Social Navigation in Simulated Environments

   • Fagner de Assis Moura Pimentel
   • Plinio Thomaz Aquino-Jr

   Regular Paper 23 July 2021 Article: 87

4. Health State Monitoring of 4-mecanum Wheeled Mobile Robot Actuators and its Impact on the Robot Behavior Analysis

   • Samia Mellah
   • Guillaume Graton
   • Alain Planchais

   Regular Paper 20 July 2021 Article: 86

5. Knowledge Acquisition from Pedestrian Flow Analysis using Sparse Mobile Probe Data

   • Ranulfo Plutarco Bezerra Neto
   • Kazunori Ohno
   • Satoshi Tadokoro

   Regular Paper Open access 17 July 2021 Article: 85

6. Event-Triggered Adaptive Hybrid Position-Force Control for Robot-Assisted Ultrasonic Examination System

   • Mohamed Abbas
   • Sami Al Issa
   • Santosha K. Dwivedy

   Regular Paper 14 July 2021 Article: 84

7. Engineering Swarms of Cyber-Physical Systems with the CPSwarm Workbench

   • Micha Sende
   • Melanie Schranz
   • Martina Umlauft

   Short Paper 13 July 2021 Article: 83

8. On the Design and Development of Vision-based Tactile Sensors

   • Umer Hameed Shah
   • Rajkumar Muthusamy
   • Lakmal Seneviratne

   Short Paper 10 July 2021 Article: 82

9. Image-Based Visual Servo Tracking Control of a Ground Moving Target for a Fixed-Wing Unmanned Aerial Vehicle

   • Lingjie Yang
   • Zhihong Liu
   • Lincheng Shen

   Regular Paper 09 July 2021 Article: 81

10. Camera-Based Tracking of Floating Objects using Fixed-wing UAVs

    • Håkon Hagen Helgesen
    • Torleiv H. Bryne
    • Tor Arne Johansen

    Regular Paper Open access 08 July 2021 Article: 80

11. Relative Camera Pose Estimation using Synthetic Data with Domain Adaptation via Cycle-Consistent Adversarial Networks

    • Chenhao Yang
    • Yuyi Liu
    • Andreas Zell

    Regular Paper Open access 08 July 2021 Article: 79

12. Enhanced Center Constraint Weighted A* Algorithm for Path Planning of Petrochemical Inspection Robot

    • Xin Lai
    • JiaHe Li
    • Jonathon Chambers

    Short Paper 08 July 2021 Article: 78

13. Reinforcement Learning versus Conventional Control for Controlling a Planar Bi-rotor Platform with Tail Appendage

    • Halil Ibrahim Ugurlu
    • Sinan Kalkan
    • Afsar Saranli

    Regular Paper 08 July 2021 Article: 77

14. Biomechanical Assessment of Adapting Trajectory and Human-Robot Interaction Stiffness in Impedance-Controlled Ankle Orthosis

    • João M. Lopes
    • Joana Figueiredo
    • Cristina P. Santos

    Regular Paper 08 July 2021 Article: 76

15. A Climbing Robot for Steel Bridge Inspection

    • Son Thanh Nguyen
    • Hung Manh La

    Regular Paper 05 July 2021 Article: 75

16. Observer-based Geometric Impedance Control of a Fully-Actuated Hexarotor for Physical Sliding Interaction with Unknown Generic Surfaces

    • Ran Jiao
    • Ramy Rashad
    • Stefano Stramigioli

    Regular Paper 02 July 2021 Article: 74

17. Human-Robot Collaborative Manipulation with the Suppression of Human-caused Disturbance

    • Shiqi Li
    • Haipeng Wang
    • Shuai Zhang

    Regular Paper 02 July 2021 Article: 73

18. Structure Aided Odometry (SAO) : A Novel Analytical Odometry Technique Based on Semi-Absolute Localization for Precision-Warehouse Robotic Assistance in Environments with Low Feature Variation

    • Kartik Prakash
    • Mohamed Naveed Gul Mohamed
    • Zohaib Hasnain

    Regular Paper 02 July 2021 Article: 72