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By using a Papkovich Neuber potential based 3D numerical contact modeling method [1], it has been shown that using a wave structured contact surface topography can reduce contact interface resistance by a factor of 2 at a given normal load. It has been proposed that a wave structured topography can be used to reduce contact normal force as a method to reduce connector mating forces. Since there is...
Machine learning is a useful method to assess biomedical data. However, due to the complexity of these data, it is important to rely on a robust methodology. Predictions with machine learning are not only an add-on to statistical analysis but are a real process of discovering and establishing clinical validity of the diagnostic techniques. This paper describes a machine learning approach to predict...
This paper presents the design, implementation, and control of a novel microelectromechanical system (MEMS) force sensor. The device features bidirectional electrostatic actuators and on-chip piezoresistive displacement sensors. For the fabrication, a standard silicon-on-insulator process is used. Due to the bidirectional geometry, the probe is able to perform force measurement in both push and pull...
In this paper we present the use of a dielectrophoresis (DEP) cytometry technique to study changes in single cells upon application of a particular stimulus. In one case we measure single CHO cells immediately after exposure to pulsed electric fields. Our results show a significant change in the dielectric response of cells after application of sufficiently strong pulses. In another study we investigate...
This paper presents the implementation of a Finger force detection platform capable to measure the exerted forces by the index, middle, ring and little finger in single-axis direction (flexion); and in dual-axis direction (flexion/adduction) by the thumb. It can be adapted to different sizes in both right or left hand. A test protocol is established. Also, a Graphical User Interface (GUI) is developed...
Robotic-assisted surgery requires an intuitive and effective human-machine interface. Providing haptic feedback for pinching and dissecting motions of bipolar forceps, a tool commonly used in neurosurgery, could potentially improve the surgeon's experience. Current haptic hand controllers have limited actuation and feedback capability, requiring surgeons to hold the handle differently compared to...
Numerous robotic devices have been developed to assist hand rehabilitation; however, a majority of these are difficult for stroke survivors to wear. The purpose of this study was to develop an assistive device for treating flexion contracture, which supports the extension of each finger and may easily be worn on a paralyzed hand. To facilitate ease of use, we suggested a new wearing method for this...
Microscopy enables an unprecedented methodology to interrogate matter characteristics which revolutionizes the development of modern science. However, not all information about matters can be obtained by simply seeing their shape and dimensions. Consequently complex light-matter interaction is often required to reveal the hidden perspectives of light. Among the many unseen optical properties of matters,...
This paper describes a force sensor using metallic piezoresistive transducer for measuring the force originated by the physical interaction of the rigid body or arm incorporated autonomous vehicles in x, y and z co-ordinates [Fx, Fy and Fz]. It explains a theory, design and construction of single axis and multi-axis force/torque sensor. Here presents a novel idea for design a three degree of freedom...
Atomic force microscope (AFM) is a useful apparatus for measuring interaction forces between an AFM tip and samples at nanoscale. These forces can be classified into a normal force and a lateral force based on the deformation of AFM cantilever. The reliability of the measurement result is influenced by calibrating the spring constant of the AFM probe directly. However, it is still a challenge to quantitative...
Fundamental understanding of the mechanics of contact for metallic nanocontacts is crucial for scanning probe microscopy (SPM) techniques that enable precise measurements of electrical properties of surfaces. The conventional approach for quantitative analysis of electrical SPM measurements relies on combining continuum mechanics models of contact with classical or ballistic electronic transport theories...
Functional electrical stimulation (FES) is a type of neuroprosthesis in which muscles are stimulated by electrical pulses in order to compensate for the loss of voluntary movement control. Modulating the stimulation intensities to reliably generate movements is a challenging control problem. For the first time, this paper presents a feedback controller for FES to control arm movements in a 2D (table-top)...
Static stretching is widely performed to decrease muscle tone as a part of rehabilitation protocols. Finding out the optimal duration of static stretching is important to minimize the time required for rehabilitation therapy and it would be helpful for maintaining the patient's motivation towards daily rehabilitation tasks. Several studies have been conducted for the evaluation of static stretching;...
Difficulty of swallowing, called dysphagia, leads to aspiration pneumonia which is particularly a big health concern in aging societies. Therefore, prevention and treatment of dysphagia would contribute to extending healthy-life and QOL of elderly people and decreasing healthcare cost. Robotics technologies are expected as one of the effective methods to solve the problem in terms of detecting malfunction...
The paper proposes a novel apparatus to measure the dynamic elasticity of human limb in order to help the design and fabrication of the personalized prosthetic socket. To take measurements of the dynamic elasticity, the desired force generated as an exponential chirp signal in which the frequency increases and amplitude is maintained according to time progress is applied to human limb and then the...
(We describe the fabrication, characterization and operation of a microfabricated, overhanging micromachined SU-8 device that can stretch and compress individual cells. This compliant device is composed of folded beams with a single actuation point. Upon actuation with a glass micropipette attached to an XYZ positioner, it can apply varying deformation to multiple cells simultaneously. The applied...
Numerous endeavors have been made in creating automated post-stroke hand rehabilitation and assistive devices over the last decade. An extensive variety of actuators have been investigated in directing the patients' finger to maneuver in a natural path. Despite the fact that their execution is considered satisfactory for some typical undertakings, there is ample room for improvement by applying late...
This paper proposes the use of an instrumented object for the study of the human grasping strategies. The proposed object is able to measure the grasping forces by means of three Force Sensitive Resistor (FSR) sensors and triaxial acceleration through an accelerometer. The object orientation angles (roll and pitch) can be estimated from the accelerometer output in quasi-static condition, whereas slippage...
Working at micro-scale efficiently requires accurate and integrated force feedback implemented with a sensor adapted to the scale. This paper presents a 3D-printed vision-based micro-force sensor intended to be used inside the chamber of a Scanning Electron Microscope (SEM). The combination of 3D printed elastic structures with a highly effective vision based measurement method allows to design integrated...
In order to enhance the performance of rehabilitation robots, it is imperative to know both force and motion caused by the interaction between user and robot. However, common direct measurement of both signals through force and motion sensors not only increases the complexity of the system but also impedes affordability of the system. As an alternative of the direct measurement, in this work, we present...
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