Entity

Time filter

Source Type


Kumar N.,Central Scientific Instruments Organisation CSIO | Singh D.P.,Central Scientific Instruments Organisation CSIO | Kumar A.,Central Scientific Instruments Organisation CSIO | Sohi B.S.,University Institute of Engineering and Technology
International Journal of Medical Engineering and Informatics | Year: 2010

Measuring the heel strike and toe time during walking provides valuable insight to the spatiotemporal parameters of human gait. The authors developed a sensor mechanism using FSR. Result shows that FSR sensor show high degree of accuracy and repeatability for measuring heel strike and toe contact time. The objective of the research was to develop a rugged and robust sensor mechanism to be used in prosthetic shoes which will help to determine the gait parameters for precise control of intelligent prosthetic devices. © 2010 Inderscience Enterprises Ltd. Source


Sidhu H.S.,Thapar University | Kumar S.,Central Scientific Instruments Organisation CSIO | Das A.,Central Scientific Instruments Organisation CSIO | Sardana H.K.,Central Scientific Instruments Organisation CSIO
ICIIP 2011 - Proceedings: 2011 International Conference on Image Information Processing | Year: 2011

A novel and efficient stereo matching algorithm based on robust disparity estimation even in the presence of occlusions is presented in this paper. The algorithm employs the Sum of Absolute Difference (SAD) approach for measure of similarity between two images. A pre-processing stage is applied to smoothen the sharp changes in pixel values at the object boundaries and also help in reducing photometric distortion and noise. Occlusions are removed by using Left-Right consistency constraint which will be explained further in this paper. After the calculation of disparity, image information is combined with the pixel disparities to obtain a cleaner disparity map. The developed algorithm was tested on benchmarked Middlebury data sets as well as acquired sample images. The results obtained are in line with the results of the ground truth images. © 2011 IEEE. Source


Kumar N.,Central Scientific Instruments Organisation CSIO | Soni S.,Central Scientific Instruments Organisation CSIO | Kumar A.,Central Scientific Instruments Organisation CSIO | Sohi B.S.,University Institute of Engineering and Technology
Journal of Scientific and Industrial Research | Year: 2010

This study presents design and development of an electronic knee, which uses attached sensors, microcontrollers and electro pneumatic valve arrangement to emulate near natural walk. Being all sensors and mechanical assembly developed indigenously, prototype would be a low cost electronic knee. Source


Kumar N.,Central Scientific Instruments Organisation CSIO | Sharma G.,Central Scientific Instruments Organisation CSIO | Kumar A.,Central Scientific Instruments Organisation CSIO | Sohi B.S.,Surya World
International Journal of Medical Engineering and Informatics | Year: 2011

The measurements of components of ground reaction force (GRF) are important in biomechanical analysis for clinical gait assessment, gait research, rehabilitation, ergonomics and sports. Ground reaction forces (vertical, fore-aft, lateral) are the reaction forces as a result of contact between the foot and the ground and these forms an integral part of human movement analysis. The purpose of this study was to demonstrate the effects of walking speed on GRF using Kistler quartz force platform embedded on the floor. In order to minimise differences in the gait of normal subjects due to 'constrained' walking, subject were requested to walk with their self-selected walking speed on the walkway. Components of GRF were recorded and analysed using Kistler's Bioware software. It was convincingly observed that with increasing walking speed magnitude of vertical component of ground reaction force increases at F z1 and F z3 whereas decreased at F z2. The for-aft component shows an increasing trend at F y1 and F y2 with increasing walking speed but no such trend can be seen in case of the lateral component. © 2011 Inderscience Enterprises Ltd. Source


Rastogi R.,Central Scientific Instruments Organisation CSIO | Tuteja S.,Central Scientific Instruments Organisation CSIO | Tripathi S.K.,University of Punjab | Kaur I.,Central Scientific Instruments Organisation CSIO | Bharadwaj L.M.,Central Scientific Instruments Organisation CSIO
Advanced Science Letters | Year: 2011

Direct electrochemistry of hemoglobin (Hb) is usually implemented by immobilizing it on the electrode. In-situ determination of Hemoglobin is little bit tough due to slow electron transfer in solution phase owing to its complex structure. In this study, we report in-situ direct electrochemistry of hemoglobin using vertically aligned single walled carbon nanotubes (SWNTs) ropes on indium tin oxide (ITO) platform. Morphological characterization of aligned SWNTs is accomplished using optical surface profiler, FE-SEM and AFM. Electrochemical impedance spectroscopy (EIS) of SWNT/ITO electrode reveals reduction in 'charge transfer resistance' for SWNT/ITO electrode in comparison to ITO. Exchange current density increases tenfold (5.4×10 -2 A cm -2) while standard rate constant increases hundred times (1.2×10 -4 C 2s -1cm -2) after vertical alignment of SWNTs on ITO surface. Cyclic voltammetry (CV) of Hb demonstrates tenfold increase in the currents after SWNT immobilization. Kinetic studies using CV revel surface controlled nature of the reaction that is attributed to concentration of Hb molecules in close proximity of the electrode, which in turn is due to negatively charged carboxyl ends of aligned carbon nanotubes. Moreover, a plausible mechanism for increase of peak currents in acidic pH range is also presented that clearly demonstrates the role of oxygen containing groups at the carbon nanotube ends for direct electron transfer from hemoglobin. Sensitivity of the sensor is determined for both lyophilized Hb and that present in red blood cells (RBCs) separated from whole blood. It is found to be 21.2μAμM -1 and 8.94μAdLg -1 respectively. Lower detection limit of hemoglobin is found to be 10 nM. After successful demonstration of aligned carbon nanotubes (CNTs) in solution phase electrochemistry of hemoglobin, SWNT/ITO electrodes can be used for routine clinical determination of hemoglobin in whole blood samples using RBCs. © 2011 American Scientific Publishers. Source

Discover hidden collaborations