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A robotic test rig for performance assessment of prosthetic joints (2022)
Journal Article
Etoundi, A. C., Dobner, A., Agrawal, S., Semasinghe, C. L., Georgilas, I., & Jafari, A. (2022). A robotic test rig for performance assessment of prosthetic joints. Frontiers in Robotics and AI, 8, https://doi.org/10.3389/frobt.2021.613579

Movement within the human body is made possible by joints connecting two or more elements of the musculoskeletal system. Losing one or more of these connections can seriously limit mobility, which in turn can lead to depression and other mental issue... Read More about A robotic test rig for performance assessment of prosthetic joints.

Therapy Easy: A co-designed hand rehabilitation system using Leap motion controller (2022)
Conference Proceeding
Jena, A., Chong, J., Jafari, A., & Etoundi, A. (2022). Therapy Easy: A co-designed hand rehabilitation system using Leap motion controller. In 2021 24th International Conference on Mechatronics Technology (ICMT)https://doi.org/10.1109/icmt53429.2021.9687286

Disability affects over 1 billion people across the globe [1]. About 190 million people in this demographic aged 15 or older require healthcare services due to having significant difficulties in functioning [1]. Upper limb disability is one such issu... Read More about Therapy Easy: A co-designed hand rehabilitation system using Leap motion controller.

Integration of computer vision in a testing facility for prosthetic joint inspection and performance assessment (2022)
Conference Proceeding
Glanville, S., Chong, J. J., Jafari, A., & Etoundi, A. (2022). Integration of computer vision in a testing facility for prosthetic joint inspection and performance assessment. In 2021 24th International Conference on Mechatronics Technology (ICMT)https://doi.org/10.1109/icmt53429.2021.9687237

This paper presents a computer vision system within a test facility for prosthetic joint inspection and performance by analysing range of motion data. Testing with individuals rather than using a testing facility can cause issues, such as irritation,... Read More about Integration of computer vision in a testing facility for prosthetic joint inspection and performance assessment.

Mimicking condylar knee to design bio-inspired robotic knee joint based on magnetic resonance imaging (2022)
Conference Proceeding
Hung, C. H., Etoundi, A., Jafari, A., Matthews, J., Chang, W. C., & Chong, J. J. (2022). Mimicking condylar knee to design bio-inspired robotic knee joint based on magnetic resonance imaging. In 2021 24th International Conference on Mechatronics Technology (ICMT)https://doi.org/10.1109/icmt53429.2021.9687202

The process of designing bio-inspired knee joint has been a challenging issue due to the complicated kinematics and dynamics of the human knee joint. This paper addresses this issue by presenting a design methodology that has been used to model the h... Read More about Mimicking condylar knee to design bio-inspired robotic knee joint based on magnetic resonance imaging.

Physiological data measurement in digital manufacturing (2022)
Conference Proceeding
Chong, J., Yacoub, A. A., Agrawal, S., Giuliani, M., Etoundi, A., & Jafari, A. (2022). Physiological data measurement in digital manufacturing. In 2021 24th International Conference on Mechatronics Technology (ICMT)https://doi.org/10.1109/ICMT53429.2021.9687200

As industry is moving towards a new digital rev-olution, identifying workers' mental and physical status is key to improved productivity in a digital manufacturing scenario. The main objective here is to provide an overview of sensing technologies in... Read More about Physiological data measurement in digital manufacturing.

Virtual inertia as an energy dissipation element for haptic interfaces (2022)
Journal Article
Choi, H., Kim, N. G., Jafari, A., Singh, H., & Ryu, J. H. (2022). Virtual inertia as an energy dissipation element for haptic interfaces. IEEE Robotics and Automation Letters, 7(2), 2708-2715. https://doi.org/10.1109/LRA.2022.3144492

Adding virtual damping to dissipate energy has been a major tool for designing stable haptic interfaces in most passivity-based approaches. However, virtual damping is known to dissipate a limited amount of energy. It even generates energy during hig... Read More about Virtual inertia as an energy dissipation element for haptic interfaces.

Bio-inspired knee joint: Trends in the hardware systems development (2021)
Journal Article
Etoundi, A. C., Semasinghe, C. L., Agrawal, S., Dobner, A., & Jafari, A. (2021). Bio-inspired knee joint: Trends in the hardware systems development. Frontiers in Robotics and AI, 8, https://doi.org/10.3389/frobt.2021.613574

The knee joint is a complex structure that plays a significant role in the human lower limb for locomotion activities in daily living. However, we are still not quite there yet where we can replicate the functions of the knee bones and the attached l... Read More about Bio-inspired knee joint: Trends in the hardware systems development.

Application of machine learning towards design optimisation of bio-inspired transfemoral prosthetic socket for robotic leg test rig (2020)
Conference Proceeding
Etoundi, A., Semasinghe, C., Agrawal, S., Sabau, P., Chong, J. J., & Jafari, A. (2020). Application of machine learning towards design optimisation of bio-inspired transfemoral prosthetic socket for robotic leg test rig. https://doi.org/10.23919/iccas50221.2020.9268404

In the past century many medical advancements in prosthetics have been achieved, however, discomfort in prosthetic socket remains one of the toughest challenges faced by both amputees and prosthetists. Wearing an uncomfortable socket can lead to user... Read More about Application of machine learning towards design optimisation of bio-inspired transfemoral prosthetic socket for robotic leg test rig.

A de-risked bio-inspired condylar prosthetic knee joint for a robotic leg test rig (2020)
Conference Proceeding
Agrawal, S., Simasinghe, C., Jafari, A., Etoundi, A., & Jie Chong, J. (in press). A de-risked bio-inspired condylar prosthetic knee joint for a robotic leg test rig

The design of the human knee joint has been a challenging task due to the presence of intricate parts, complex mechanisms and their interdependence which joins them together. A bio-inspired design for the condylar knee joint has been proposed in earl... Read More about A de-risked bio-inspired condylar prosthetic knee joint for a robotic leg test rig.

Application of machine learning towards design optimisation of bio-inspired transfemoral prosthetic socket for robotic leg test rig (2020)
Conference Proceeding
Sabau, P., Jie Chong, J., Jafari, A., Agrawal, S., Semasinghe, C., & Etoundi, A. (in press). Application of machine learning towards design optimisation of bio-inspired transfemoral prosthetic socket for robotic leg test rig

In the past century many medical advancements in prosthetics have been achieved, however, discomfort in prosthetic socket remains one of the toughest challenges faced by both amputees and prosthetists. Wearing an uncomfortable socket can lead to user... Read More about Application of machine learning towards design optimisation of bio-inspired transfemoral prosthetic socket for robotic leg test rig.

Multilateral teleoperation over communication time delay using the time-domain passivity approach (2019)
Journal Article
Ryu, J., Ha-Van, Q., & Jafari, A. (2020). Multilateral teleoperation over communication time delay using the time-domain passivity approach. IEEE Transactions on Control Systems Technology, 28(6), 2705 - 2712. https://doi.org/10.1109/TCST.2019.2948126

A general framework to stabilize multilateral teleoperation system over a communication time delay based on the well-known time-domain passivity approach (TDPA) is proposed. The uniqueness of this framework is that it is independent of the amount of... Read More about Multilateral teleoperation over communication time delay using the time-domain passivity approach.

Enhancing the rate-hardness of haptic interaction: Successive force augmentation approach (2019)
Journal Article
Singh, H., Janetzko, D., Jafari, A., Weber, B., Lee, C. I., & Ryu, J. H. (2020). Enhancing the rate-hardness of haptic interaction: Successive force augmentation approach. IEEE Transactions on Industrial Electronics, 67(1), 809-819. https://doi.org/10.1109/TIE.2019.2918500

© 1982-2012 IEEE. There have been numerous approaches that have been proposed to enlarge the impedance range of haptic interaction while maintaining stability. However, enhancing the rate-hardness of haptic interaction while maintaining stability is... Read More about Enhancing the rate-hardness of haptic interaction: Successive force augmentation approach.

Enhancing the force transparency of time domain passivity approach: Observer-based gradient controller (2019)
Presentation / Conference
Singh, H., Jafari, A., & Ryu, J. (2019, May). Enhancing the force transparency of time domain passivity approach: Observer-based gradient controller. Paper presented at The 2019 International Conference on Robotics and Automation (ICRA)

Passivity has been the most often used constraint for the stable controller design of bilateral teleoperation systems. Especially, Time Domain Passivity Approach (TDPA) has been used in many applications since it has been known as one of the least co... Read More about Enhancing the force transparency of time domain passivity approach: Observer-based gradient controller.

Enhancing the Command-Following Bandwidth for Transparent Bilateral Teleoperation (2018)
Journal Article
Singh, H., Jafari, A., Ryu, J. H., & Peer, A. (2018). Enhancing the Command-Following Bandwidth for Transparent Bilateral Teleoperation. Proceedings of the ... IEEE/RSJ International Conference on Intelligent Robots and Systems. IEEE/RSJ International Conference on Intelligent Robots and Systems, 4972-4979. https://doi.org/10.1109/IROS.2018.8593866

© 2018 IEEE. Enhancing transparency of a teleoperation system by increasing the command-following bandwidth has not received lots of attention so far. This is considered a challenging task since in a teleoperation system the command-following bandwid... Read More about Enhancing the Command-Following Bandwidth for Transparent Bilateral Teleoperation.

Lyapunov observer/controller for stable haptic interaction (2018)
Conference Proceeding
Jafari, A., Singh, H., Karunanayaka, H., Ryu, J. H., Chong, J., & Etoundi, A. (2018). Lyapunov observer/controller for stable haptic interaction. https://doi.org/10.1109/AIM.2018.8452311

© 2018 IEEE. Passivity has been the most common tool to achieve stability in haptic and teleoperation systems; however passivity-based approaches suffer from the conservativism of passivity criteria. Therefore, it is essential to have an approach whi... Read More about Lyapunov observer/controller for stable haptic interaction.

Modelling of a Bio-Inspired Knee Joint and Design of an Energy Saving Exoskeleton Based on Performance Maps Optimisation for Condylar Knee Prosthetics (2018)
Conference Proceeding
Etoundi, A., Chong, J., & Jafari, A. (2018). Modelling of a Bio-Inspired Knee Joint and Design of an Energy Saving Exoskeleton Based on Performance Maps Optimisation for Condylar Knee Prosthetics. https://doi.org/10.1109/CoDIT.2018.8394776

© 2018 IEEE. The process of designing bio-inspired knee joint for prosthetics/exoskeletons has been a challenging issue due to the complicated relationships between the performance criteria and the link lengths of the design space, or workspace in th... Read More about Modelling of a Bio-Inspired Knee Joint and Design of an Energy Saving Exoskeleton Based on Performance Maps Optimisation for Condylar Knee Prosthetics.

Design of anatomy-based 3D patient-specific knee replacement implant model from medical imaging (2018)
Presentation / Conference
Chong, J., Matthews, J., Jafari, A., & Appolinaire, E. (2018, June). Design of anatomy-based 3D patient-specific knee replacement implant model from medical imaging. Paper presented at 2018 The 2nd International Conference on Mechanical, System and Control Engineering (ICMSC 2018)

This paper focuses on the design of an anatomy-based 3D patient-specific knee replacement implant model, which is derived from medical imaging. The investigation extracted the knee profiles from MRI scans to develop a 3D model of the knee, including... Read More about Design of anatomy-based 3D patient-specific knee replacement implant model from medical imaging.

A conceptual exoskeleton shoulder design for the assistance of upper limb movement (2018)
Journal Article
Perez, C. N., Georgilas, I., Etoundi, A., Chong, J., & Jafari, A. (2018). A conceptual exoskeleton shoulder design for the assistance of upper limb movement. Lecture Notes in Artificial Intelligence, 10965 LNAI, 291-302. https://doi.org/10.1007/978-3-319-96728-8_25

© Springer International Publishing AG, part of Springer Nature 2018. There is an increased interest on wearable technologies for rehabilitation and human augmentation. Systems focusing on the upper limbs are attempting to replicate the musculoskelet... Read More about A conceptual exoskeleton shoulder design for the assistance of upper limb movement.

Realizing low-impedance rendering in admittance-type haptic interfaces using the input-to-state stable approach (2017)
Journal Article
Nabeel, M., Jafari, A., & Ryu, J. H. (2017). Realizing low-impedance rendering in admittance-type haptic interfaces using the input-to-state stable approach. Proceedings of the ... IEEE/RSJ International Conference on Intelligent Robots and Systems. IEEE/RSJ International Conference on Intelligent Robots and Systems, 2017-September, 914-919. https://doi.org/10.1109/IROS.2017.8202254

© 2017 IEEE. This paper proposes an approach to enlarge the impedance range of admittance-type haptic interfaces. Admittance-type haptic interfaces have advantages over impedance-type haptic interfaces in the interaction with high impedance virtual e... Read More about Realizing low-impedance rendering in admittance-type haptic interfaces using the input-to-state stable approach.

The Input-to-State Stable (ISS) approach for stabilizing haptic interaction with virtual environments (2017)
Journal Article
Jafari, A., Nabeel, M., & Ryu, J. H. (2017). The Input-to-State Stable (ISS) approach for stabilizing haptic interaction with virtual environments. IEEE Transactions on Robotics, 33(4), 948-963. https://doi.org/10.1109/TRO.2017.2676127

© 2004-2012 IEEE. Passivity has been a major criterion for designing a stable haptic interface due to its numerous advantages. However, passivity-based controllers have suffered from the design conservatism of the passivity criterion, particularly wh... Read More about The Input-to-State Stable (ISS) approach for stabilizing haptic interaction with virtual environments.