scholarly journals Magnitude Finger Forces Analysis During Simulating Pseudo-Haptic Spring

2021 ◽  
pp. 215-220
Author(s):  
Jingtao Chen ◽  
Peter Mitrouchev ◽  
Sabine Coquillart ◽  
Franck Quaine
Keyword(s):  
Force Feedback ◽  
Isometric Force ◽  
Research Work ◽  
Motor Disorder ◽  
Joint Movement ◽  
Finger Force ◽  
Force Magnitude ◽  
Computer Based ◽  
Finger Forces ◽  
Rehabilitation Tasks

AbstractThis paper focuses on finger force magnitude analysis during stiffness discrimination task. In the frame of their Study and research work MS students from the Université Grenoble Alpes specially designed an experimental bench allowing to simulate a pseudo-haptic spring. Then, a series of stiffness discrimination tests between reals springs and a pseudo-haptic spring were performed. Finger pressing forces and students’ (subjects’) perception of spring stiffness were recorded and analyzed. The analysis of psychometric curves indicates that subjects underestimate the simulated stiffness of the pseudo-haptic spring. The results also indicate that the peak of finger force applied on pseudo-haptic spring increases as the simulated stiffness increases. Moreover, it was found that the relationships between the logarithm of stiffness and the finger force were linear for the real springs and the pseudo-haptic spring. Pseudo-haptics effect being provided by specially designed isometric force feedback device, the results of this study may be useful for computer-based rehabilitation tasks designed for motor disorder patients with muscle deficiency associated with limited joint movement range or for injured athletes in the process of rehabilitation.

A Computer-based Clinical Information System

1987 ◽  
Vol 26 (04) ◽  
pp. 189-194
Author(s):  
S. S. El-Gamal
Keyword(s):  
Information System ◽  
Hospital Information System ◽  
Clinical Information System ◽  
Research Work ◽  
Clinical Information ◽  
Hospital Staff ◽  
Vital Role ◽  
Daily Routine ◽  
Specialized Hospital ◽  
Computer Based

SummaryModern information technology offers new opportunities for the storage and manipulation of hospital information. A computer-based hospital information system, dedicated to urology and nephrology, was designed and developed in our center. It involves in principle the employment of a program that allows the analysis of non-restricted, non-codified texts for the retrieval and processing of clinical data and its operation by non-computer-specialized hospital staff.This Hospital Information System now plays a vital role in the efficient provision of a good quality service and is used in daily routine and research work in this hospital. This paper describes this specialized Hospital Information System.

A new representation for a robot grasping quality measure

Robotica ◽  
1995 ◽  
Vol 13 (3) ◽  
pp. 287-295 ◽  
Author(s):  
Venugopal K. Varma ◽  
Uri Tasch
Keyword(s):  
Objective Function ◽  
Material Properties ◽  
Graphical Representation ◽  
Contact Forces ◽  
Geometric Constraints ◽  
Objective Functions ◽  
Finger Force ◽  
Finger Forces ◽  
Robot Grasping ◽  
Selection Of

SummaryWhen an object is held by a multi-fingered hand, the values of the contact forces can be multivalued. An objective function, when used in conjunction with the frictional and geometric constraints of the grasp, can however, give a unique set of finger force values. The selection of the objective function in determining the finger forces is dependent on the type of grasp required, the material properties of the object, and the limitations of the röbot fingers. In this paper several optimization functions are studied and their merits highlighted. The paper introduces a graphical representation of the finger force values and the objective functions that enable one to select and compare various grasping configurations. The impending motion of the object at different torque and finger force values are determined by observing the normalized coefficient of friction plots.

Measuring poststroke spasticity

2000 ◽  
Vol 10 (1) ◽  
pp. 69-74 ◽  
Author(s):  
J. M. Gregson ◽  
A. K. Sharma
Keyword(s):  
Normal State ◽  
Stretch Reflex ◽  
Muscle Activation ◽  
Muscle Tone ◽  
Clinical Syndrome ◽  
Motor Disorder ◽  
Muscle Forces ◽  
Joint Movement ◽  
Stretch Reflexes ◽  
Reflex Action

What is spasticity?Spasticity is a well-recognized and potentially important clinical syndrome comprising inappropriate and involuntary high muscle tone. It has been variably defined, with debate still ongoing. Currently, the most widely accepted definition is that of Lance, stating that spasticity is ‘a motor disorder characterized by a velocity-dependent increase in tonic stretch reflexes (muscle tone) with exaggerated tendon jerks, resulting from hyper-excitability of the stretch reflex.’ Unfortunately, even this description does not fully encompass the multifactorial nature of spasticity, since resistance to movement, even in the normal state, is subject to varied contributors. These include patient volition, inertia, visco-elastic muscle forces and range of joint movement, as well as true muscle activation secondary to reflex action. In the real clinical world, it is often not possible to distinguish which of these features is/are dominant. Furthermore, spastic muscle undergoes physiopathological, rheologic change with stiffness, atrophy, fibrosis and finally contracture.

Characterization of Forces in High-Speed Bone Cutting and Grinding for Haptics Rendering

2016 ◽  
Author(s):  
Avinash Danda ◽  
Yi Tang Kao ◽  
Mathew A. Kuttolamadom ◽  
Bruce L. Tai
Keyword(s):  
Feed Rate ◽  
High Speed ◽  
Force Feedback ◽  
Identical Condition ◽  
Tool Orientation ◽  
Force Magnitude ◽  
Force Profile ◽  
Grinding Conditions ◽  
Surgical Simulations

This study characterizes the forces in high-speed bone cutting and grinding for the use of haptic devices in surgical simulations. Unrealistic force feedback due to the lack of vibrational features is one of the most common drawbacks. Generally, the force profile can be decomposed to a mean force and a vibrational force magnitude. These forces are experimentally measured under various motions, including feed rate and tool orientation, to mimic manual operations and to understand the effects of these parameters. Change in feed rate was found to be insignificant in the overall force feedback, while the change in tool orientation showed statistically significant effects. The grinding burr and cutting burr also exhibited different forces under an identical condition. The explanation for the behavior of the forces based on the cutting and grinding conditions is discussed along with the results.

A Literature Survey on Early Detection of Malignant Tumor Through Computerized Technique

2020 ◽  
Vol 17 (9) ◽  
pp. 3873-3877
Author(s):  
S. V. Shwetha ◽  
L. Dharmanna
Keyword(s):  
Detection System ◽  
Imaging Techniques ◽  
Research Work ◽  
Texture Feature ◽  
Statistical Parameters ◽  
Transformation Ratio ◽  
Initial Stage ◽  
Stage Classification ◽  
Cancer Tumor ◽  
Computer Based

Computer based initial stage classification and detection of breast cancer tumor must be taken as one of the most important parameter to detect cancer in order to assist radiologist. In this paper an overview of current development of computer based detection system has been reviewed. The abnormalities identification and classification based on texture feature and shape of tumor, statistically diagnostic parameters (mean, mode, standard deviation, median etc.), Entropy based, Elliptical Normalized Circumference (ENC), C-means, K-means, Watershed Transformation, Ratio of Perimeter:Area (P :A), Ratio of major axis:minor axis (L:S) and Content Based Image Retrieval (CBIR) have been presented. In this paper the accuracy of the result obtained by various techniques such as texture based classification (80%), statistical parameters based classification (70%), shape based classification (86%), CBIR based classification (60%), etc. are presented. The various imaging techniques and dedicated databases publicly available for the cancer research work have been listed, discussed and reported in this paper.

Modeling constraints to redundancy in bimanual force coordination

2011 ◽  
Vol 105 (5) ◽  
pp. 2169-2180 ◽  
Author(s):  
Xiaogang Hu ◽  
Karl M. Newell
Keyword(s):  
Muscle Force ◽  
Coupling Effect ◽  
Isometric Force ◽  
Force Production ◽  
Force Output ◽  
Task Constraints ◽  
Task Goal ◽  
Force Coordination ◽  
Finger Forces ◽  
Coordination Patterns

This study investigated the interactive influence of organismic, environmental, and task constraints on the organization of redundant force coordination patterns and the hypothesis that each of the three categories of constraints is weighted based on their relative influence on coordination patterns and the realization of the task goal. In the bimanual isometric force experiment, the task constraint was manipulated via different coefficients imposed on the finger forces such that the weighted sum of the finger forces matched the target force. We examined three models of task constraints based on the criteria of task variance (minimum variance model) and efficiency of muscle force output (coefficient-independent and coefficient-dependent efficiency models). The environmental constraint was quantified by the perceived performance error, and the organismic constraint was quantified by the bilateral coupling effect (i.e., symmetric force production) between hands. The satisficing approach was used in the models to quantify the constraint weightings that reflect the interactive influence of different categories of constraints on force coordination. The findings showed that the coefficient-dependent efficiency model best predicted the redundant force coordination patterns across trials. However, the within-trial variability structure revealed that there was not a consistent coordination strategy in the online control of the individual trial. The experimental findings and model tests show that the force coordination patterns are adapted based on the principle of minimizing muscle force output that is coefficient dependent rather than on the principle of minimizing signal-dependent variance. Overall, the results support the proposition that redundant force coordination patterns are organized by the interactive influence of different categories of constraints.

scholarly journals Comparative analysis of selected facial recognition algorithms

2020 ◽  
Vol 39 (3) ◽  
pp. 896-904
Author(s):  
J.A. Popoola ◽  
C.O. Yinka-Banjo
Keyword(s):  
Face Recognition ◽  
Comparative Analysis ◽  
Facial Recognition ◽  
Research Work ◽  
Cost Effective ◽  
Facial Symmetry ◽  
Face Matching ◽  
Computer Based ◽  
Haar Cascade ◽  
Detection And Recognition

Systems and applications embedded with facial detection and recognition capabilities are founded on the notion that there are differences in face structures among individuals, and as such, we can perform face-matching using the facial symmetry. A widely used application of facial detection and recognition is in security. It is important that the images be processed correctly for computer-based facial recognition, hence, the usage of efficient, cost-effective algorithms and a robust database. This research work puts these measures into consideration and attempts to determine a cost-effective and reliable algorithm out of three algorithms examined. Keywords: Haar-Cascade, PCA, Eigenfaces, Fisherfaces, LBPH, Face Recognition.

Digital Clay Force Observer Design and Shape Editing Concept

2009 ◽  
Author(s):  
Cheng Shu Ngoo ◽  
Wayne J. Book
Keyword(s):  
Mathematical Model ◽  
Force Feedback ◽  
Observer Design ◽  
Finger Force ◽  
Input Output ◽  
Force Estimation ◽  
Pressure Force ◽  
Engineering Sciences ◽  
Shape Editing ◽  
Institute Of Technology

Digital Clay is a novel fluid-driven device for shape input/output that potentially has wide application in the areas of engineering, sciences, medicine, military, entertainment etc. Shape display is achieved with the current 5×5 prototype but this research seeks to expand its haptic capability with force feedback, but the absence of pressure/force sensors requires finger force estimation. In this paper, a velocity estimator and a mathematical model are derived for the design of a force observer. A brief overview of the current 5×5 prototype at the Georgia Institute of Technology and a new concept for shape editing are also given.

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