Anoop Vyas

Anoop Vyas
Indian Institute of Technology Delhi | IIT Delhi · Centre for Instrument Design Development (IDDC)

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49
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729
Citations

Publications

Publications (49)
Article
Full-text available
This study presents the analysis and classification of maternal status during healthy pregnancy and postpartum using bispectral features of heart rate variability (HRV). Bispectral analysis is applied to HRV to extract a total of 11 features out of which only 6 significantly different feature values are used to classify the subjects into three trim...
Article
A new control approach of integrating a solar PV (Photovoltaic) with a battery storage to a single-phase grid is presented for residential and electric vehicle applications. The main purpose of the proposed work is to feed a continuous power to the grid thereby enhancing the viability of the battery energy storage support connected to the system. T...
Conference Paper
This paper presents an integration of a battery support to a single phase grid with a solar PV system. The unique control of multi-functional voltage source converter achieves controlled charging and discharging of the battery. The implemented converter achieves the extraction of maximum power from varying solar PV array further maintaining the bat...
Article
This work deals with the control of a solar photovoltaic array and a battery storage integrated into a grid. It has versatile control strategy as it provides with maximum power point tracking, battery charging/discharging and a grid current at unity power factor. This configuration along with its control helps in feeding a constant power to the gri...
Article
A grid tied photovoltaic (PV) power conversion topology is presented in this study with a novel scheme of resynchronisation to the grid. This scheme serves the purpose of supplying continuous power to the load along with feeding power to the grid. The control approach helps in mitigation of harmonics and improving the power quality while extracting...
Conference Paper
In this study, we performed heart rate variability (HRV) analysis of the non-medically compromised patients un- dergoing tooth extraction procedure using 2 ml local anaesthetic volume of 2% lignocaine with adrenaline. The increase in heart rate due to vasoconstriction in the peripheral blood vessels has been quantifying the sympathetic stimulation...
Article
A study was conducted to determine the ongoing short-term changes in pulse waveform and pulse transit time in patients during tooth extraction. The sympathetic stimulation produced during tooth extraction under local anesthesia (LA) utilizing 2% lignocaine with adrenaline is evaluated. The increase in pulse rate due to vasoconstriction in the perip...
Article
This paper presents the design, control and performance of a low power standalone solar-photovoltaic (PV) energy generating system. The system includes a maximum power point tracking (MPPT) controller along with a full bridge DC-DC converter, an energy storage system and a voltage source inverter (VSI). The detailed design and modelling of the syst...
Article
In the present study, the ongoing maternal haemodynamic and cardiovascular changes during pregnancy and postpartum stage have been studied using pulse waveform analysis. The ECG and pulse are simultaneously recorded from the subjects in the first trimester, second trimester, third trimester pregnant women and postpartum. The heart rate variability...
Article
Wrist pulse analysis is an approach of health diagnosis described in ancient Indian medicine. This approach is based on the analysis of three fingertip palpations observed over radial artery of both the hands. These three palpations identified as Vata, Pitta and Kapha in this approach are described by their unique characteristics. The characteristi...
Article
This paper describes an m-health system developed for monitoring patients with heart disease and diabetes in India. It has been developed to allow patients in remote rural regions to access health centers in large cities. Wireless medical sensor readings and personal data acquired by health workers are combined into a set of patient monitoring para...
Article
This paper presents the study of bispectrum analysis methods of heart rate variability in normotensive pregnant and postpartum women. The self and cross spectral components are estimated from bispectrum of ECG of pregnant and postpartum women. It is observed that, very low frequency (VLF) and low frequency (LF) component coupling increases while th...
Article
Full-text available
This paper presents identification of 4 different wrist movements by analyzing fore-arm surface Electromyogram (sEMG) signals. In order to reduce noise picked up during the recording, wavelet based denoising is applied using Daubechies mother wavelet. Spectral features along with Wilson's amplitude were extracted and given to a linear classifier. T...
Conference Paper
This paper deals with the analysis, design and control of a proposed standalone hybrid renewable energy conversion system based on solar and wind energy sources employing a full bridge dc-dc converter and a Permanent Magnet Brush-Less DC (PMBLDC) generator. The proposed MPPT (Maximum Power Point Tracking) controllers of solar-PV (Photo-Voltaic) arr...
Conference Paper
Full-text available
This paper presents the study and comparison of linear and non-linear heart rate variability analysis in normotensive pregnant and postpartum women. The ECG is recorded for 124 pregnant women in all three trimesters and 32 women in postpartum. The HRV analysis is carried out based on its spectral, approximate entropy (ApEn) and correlation dimensio...
Article
This paper describes the design of a wrist pulse acquisition system for acquiring the wrist pulse pressure signals for further analysis to obtain the health status. A piezoresistive pressure sensor has been chosen to sense the wrist pulse palpitation and to provide change in the resistance. The corresponding electrical signal is appropriately ampli...
Conference Paper
This paper deals with the design, modeling and control of a variable speed Wind Energy Conversion System (WECS) consisting of a permanent magnet brushless DC (PMBLDC) generator, a rectifier, a push-pull converter and a voltage source inverter (VSI) and the maximum power point tracking (MPPT) controller. The proposed mechanical sensorless MPPT contr...
Article
Full-text available
A telemedicine system is described for monitoring vital signs and general health indicators of patients with cardiac and diabetic conditions. Telemetry from wireless sensors and readings from other instruments are combined into a comprehensive set of measured patient parameters. Using a combination of mobile device applications and web browser, the...
Conference Paper
The primary aim of the present work is to lower the operating temperature of the metal-oxide based sensors for detection of volatile organic compounds (VOCs) without compromising the sensitivity of the device. For this purpose, nanostructured oxides of ITO, Cu and Zn have been explored. The oxides of Cu and Zn have been synthesized by a novel proce...
Conference Paper
This paper deals with the design and modeling of a small scale stand-alone wind energy conversion system (WECS) using a maximum power point tracking (MPPT) controller and permanent magnet brushless dc (PMBLDC) generator. The WECS consists of a wind turbine, PMBLDC generator, MPPT controller, isolated half bridge dc-dc converter, battery, voltage so...
Conference Paper
This paper presents a design and modeling of a sensorless maximum power point tracking (MPPT) controller using a permanent magnet brush-less DC (PMBLDC) generator for a wind energy conversion system (WECS). A low power WECS is designed with an isolated flyback dc-dc converter, a battery and a voltage source inverter (VSI). The sensor-less MPPT cont...
Article
Two separate projects have been carried out to implement m-health programs in India and Iraq, and, for each, this paper describes the work performed by the teams involved, presents results and details a number of lessons learned. In general, it is found that although India and Iraq have very different medical priorities, they pose similar issues wh...
Conference Paper
This paper presents the design procedure and performance of a solar-PV (photovoltaic) energy generating system using an isolated zeta converter for meeting an energy demand of rural households. The solar-PV generating system consists of solar panels, a zeta dc-dc converter, a MPPT (maximum power point tracking) controller, energy storage system, VS...
Article
A sensor for detection of acetone vapors using nanostructured ITO thin film is reported. The ITO film was sputter-deposited on glass substrate using RF magnetron sputtering at 200 W RF power in argon atmosphere at 20 mTorr pressure. The film was then annealed at 450°C for 1h in air. The sensing area was kept to be 3 mm × 3 mm. Two aluminum pads of...
Article
Full-text available
A sensor for detection of vapors of volatile organic compounds (VOCs) incorporating nanostructured zinc oxide film and silicon micromachining is reported. One of the key features of the sensor is the use of nanostructured ZnO material which has been synthesized using a novel low cost process. Considerable reduction in the operating temperature o...
Article
An ethanol sensor incorporating nanostructured zinc oxide film on integrated MEMS platform is reported. A salient feature of the sensor is its lower operating temperature, which has been achieved due to the use of nanostructured material as sensing layer in addition to a catalyst free synthesis technique to grow nanostructures. A suitably designed...
Article
Pulse pressure signals observed over radial artery have been utilised as bio-medical signals for health diagnosis as described by ancient Indian medicine where Vata, Pitta and Kapha are believed as three basic elements regulating the health conditions. Complexity analysis of all the six pulse signals has been carried out using Entropy for healthy a...
Article
Full-text available
This paper presents the design and performance of a low power stand-alone solar photovoltaic (PV) energy generating system. The system is designed considering solar-PV panels of 750W to feed an average load demand of 250W for a rural household. The system includes series-parallel combination of solar panels, MPPT (maximum power point tracking) cont...
Article
In this work, we report fabrication of low-cost and high-efficiency acetone sensors capable of operating at relatively low temperatures. Copper oxide nanowires are grown on large area substrates at relatively low-temperature without using a catalyst or a seed layer. The copper oxide nanowires have been used as sensing element. Copper oxide nanowire...
Article
An ethanol sensor incorporating nanostructures of zinc oxide film on integrated MEMS platform is reported. A salient feature of the sensor is its lower operating temperature, which has been achieved due to the use of nanostructured ZnO material as sensing layer. In addition, a catalyst free synthesis technique has been used to grow the ZnO nanos...
Article
This paper describes the growth of CuO nanowires on oxidized Si wafer by an oxidation reaction. Copper thin films of about 3 μm thickness were sputter deposited on oxidized Si wafer. The samples were then annealed in a furnace at 500 °C, 600 °C and 700 °C under normal atmospheric conditions. After heating, the color of the deposited copper turned b...
Conference Paper
Ancient Indian and Chinese medicine both use non-invasive wrist pulse signals for health diagnosis of patients. In this paper, data obtained from a number of patients have been used to categorize the types of pulse signals that are found in both normal and abnormal health conditions. Features were extracted from the pulse signals using both frequen...
Conference Paper
The security and authenticity of biomedical data are of the subjects of legal requirements. This paper proposes the use of digital watermarking to improve the security of biomedical signals transmitted over a wired or wireless network. The proposed scheme embeds a watermark sequence generated for each patient using the integer wavelet transform. Si...
Conference Paper
Advances in wireless sensor network technologies have realized new opportunities to form Wireless Body Area Network (WBAN) for pervasive remote monitoring of the patients' vital signs at hospital and remote homecare environment, thereby improving healthcare system. The wireless physiological body sensor node is capable of sensing and processing the...
Conference Paper
The pulse wave propagation is the important electromechanical characteristics of biomedical signals. Conventionally the pulse propagation features are extracted by estimating the propagation time delay between two points called pulse transit time(PTT). The PTT estimation is based on the phase analysis of the cross power spectrum and bispectrum betw...
Conference Paper
Full-text available
As electroencephalography (EEG) signals contain sensitive personal health information, it is generally a legal requirement to prevent their unauthorized access. For example, the HIPAA in the US requires that access to personal health information is limited to properly authorized individuals. In this paper, a chaos-based encryption method is propose...
Conference Paper
This paper deals with the design, control and modeling of an isolated solar-PV (Photo-Voltaic) energy generating system. The proposed system is designed for supplying an average consumer load of 1.5 kW. A constant voltage method is applied to the PV array for MPPT (Maximum Power Point Tracking). A push-pull boost dc-dc converter is fed from the PV...
Article
Full-text available
Radial pulse signals have been utilized in ancient culture health diagnosis due to its simple, non invasive approach. Characteristics of a newly identified abnormal pulse in the subjects suffering from gastritis and arthritis are along with commonly visible healthy pulse patterns in this work A binary classifier to segregate such abnormal pulse hea...
Article
Full-text available
In the present work, we report the fabrication and testing of a sensor for the detection of ethanol vapours using RF magnetron sputter deposited ITO thin film on Si substrate. The principle of operation is the change of resistance of ITO film on exposure to ethanol vapours. The ITO films were prepared by RF magnetron sputtering process. The film...
Conference Paper
Radial pulse analysis is popular as complementary approach for health diagnosis in India and China. Three pulse pressure signals on the two hands carry rich information about health status. Pressure applied while observing the pulse signal plays an important role in the analysis of the body conditions based on dynamic nature of the pulse signal. De...
Conference Paper
Radial pulse has been utilized to identify health status in Indian and Chinese complementary medicine approaches. The radial pulse signal in abnormal health conditions show variations in its morphology in comparison to that of the healthy subjects, resulting in changes in the pulse power spectrum. Comparison between the power spectrum of pulse sign...
Conference Paper
The sensor for detection of ethanol vapours using RF sputter deposited ITO thin film on glass and Si substrates is reported. The principle of operation is the change of resistance of ITO film on exposure to ethanol vapours. The films were annealed at 450°C for 1h in air. The films were extensively characterized for their structural properties using...
Article
This paper describes a practical development project to enable the monitoring of vital signs data obtained from patients located in remote rural locations. The data are gathered from a wireless network of sensors attached to a patient's body and stored locally for secure transmission over existing communication infrastructures to a hospital server....
Article
A novel Spectrum Balancing Detector (SBD) for sonar signals is introduced. The detector operates on quadrature signals as well as their Hilbert transforms using cross multiplicative structure in contrast to the square law detector which simply adds up the two components after a squaring operation. It has the special feature of forming an automatic...

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