Browsing by Author "Nagesh, DS"

Now showing 1 - 9 of 9
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    Design of Electromagnetic Probe Having Reduced Base Line Drift for Blood Flow Measurement
    (IETE JOURNAL OF RESEARCH, 2015) Nair, SS; Vinodkumar, V; Sreedevi, V; Nagesh, DS
    An improved design for electromagnetic probe for blood flow measurement is presented. The probe produces a magnetic field in the column of blood to induce a voltage as per Faraday's laws. The mechanical and electromagnetic structures are designed to reduce the effect of base line drift and signal variations with time which are very common in electromagnetic flow measurement systems. A signal with very less noise and drift is induced with a sensitivity of more than 80 mV/lpm. The signal has a linear variation with flow rates and need no frequent calibration. Signal variations with time are negligible and had less power signal interferences and noisy spikes.
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    Development of cost effective ventilator ( Project - 8239 )
    (SCTIMST, 2021-06-07) Nagesh, DS; Sarath S, Nair; Vinodkumar, V; Manikandan, S; Manoj, CS
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    Development of decellularised animal tissue for cardiovascular application ( Project - 8016 )
    (SCTIMST, 2011-12-31) Umashankar, PR; Anil S, Das; Krishna Manohar, SR; Muraleedharan, CV; Nagesh, DS; Maya, Nandakumar; Binoy, VS
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    Development of National GLP Guidelines & Identification and selection of National Regulatory Guidelines for Testing and Evaluation of Medical Devices ( Project - 8027 )
    (SCTIMST, 2022-03-31) Mohanan, PV; Muraleedharan, CV; Nagesh, DS; Maya Nandakumar, A; Lissy K, Krishnan; Kumary, TV; Mira, Mohanty; Sreenivasan, K; Bhuvaneshwar, GS
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    Digital Sanitization Systems ( Project - 8226 )
    (SCTIMST, 2020-05-31) Sarath S, Nair; Vinodkumar, V; Nagesh, DS
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    PC based instrumentation as an economic method for quality assurance - An experience based on development of hydrocephalus shunt test system
    (PROCEEDING OF THE FIRST REGIONAL CONFERENCE - IEEE ENGINEERING IN MEDICINE & BIOLOGY SOCIETY AND 14TH CONFERENCE OF THE BIOMEDICAL ENGINEERING SOCIETY OF INDIA, 1995) Nagesh, DS; Nair, SSK; Muraleedharan, CV; Bhuvaneshwar, GS
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    Rotating permanent magnet excitation for blood flow measurement
    (MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING, 2015) Nair, SS; Vinodkumar, V; Sreedevi, V; Nagesh, DS
    A compact, portable and improved blood flow measurement system for an extracorporeal circuit having a rotating permanent magnetic excitation scheme is described in this paper. The system consists of a set of permanent magnets rotating near blood or any conductive fluid to create high-intensity alternating magnetic field in it and inducing a sinusoidal varying voltage across the column of fluid. The induced voltage signal is acquired, conditioned and processed to determine its flow rate. Performance analysis shows that a sensitivity of more than 250 mV/lpm can be obtained, which is more than five times higher than conventional flow measurement systems. Choice of rotating permanent magnet instead of an electromagnetic core generates alternate magnetic field of smooth sinusoidal nature which in turn reduces switching and interference noises. These results in reduction in complex electronic circuitry required for processing the signal to a great extent and enable the flow measuring device to be much less costlier, portable and light weight. The signal remains steady even with changes in environmental conditions and has an accuracy of greater than 95 %. This paper also describes the construction details of the prototype, the factors affecting sensitivity and detailed performance analysis at various operating conditions.
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    Smart Assistive Breathing Device ( Project - 8225 )
    (2020-05-31) Sarath S, Nair; Vinodkumar, V; Nagesh, DS; Thomas, Koshy; Manikandan, S; Manoj, S
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    Success factors of public funded R&D projects
    (CURRENT SCIENCE, 2015) Nagesh, DS; Thomas, S
    Research and development (R&D) projects which are classified into basic research, applied research and product development are being carried out by industries, academia and R&D institutes. Such projects funded by government agencies are common among nations all around the globe. They are basically aimed at developing national science and technological competence than direct market orientation or commercialization and are in many respects different from industrial R&D projects. Most of them are handled by the academic/R&D institutions. Their target is long term, need high intellectual input, benefits may not be tangible and risk is high. The outcome of such R&D projects is not always successful and the underlying reasons may vary widely. Various factors have been identified and projected: out of which many are common, some are contextual and the rest are even contradicting. Not many attempts were carried out to identify the factors which contribute to the success of projects carried out by academic/R&D institutions, which is of high relevance to the Indian context. Hence in this article, we attempt to review various factors contributing to the success of projects which are funded by the government and grouped them into common eight categories such as type of the project, leader's competence, team, environment, funding and other resources, management support, collaboration and degree of difficulty.