Browsing by Author "Prajwal, K."

Now showing 1 - 8 of 8

Cardiovascular Disease Prediction Using Machine Learning
(Institute of Electrical and Electronics Engineers Inc., 2022) Prajwal, K.; Tharun, K.; Navaneeth, P.; Anand Kumar, M.
As the human population increases, so is the chance of getting diseases. There are many illnesses globally, and one of the biggest problems faced by the hospital systems today is the lack of technology to know when the patients are ill. One such illness is Cardiovascular Disease or CVD. It refers to any heart disease, vascular disease, or blood vessel disease. According to WHO, more people die of CVD's worldwide than any other cause. It affects the low and middle-income countries more. It is very hard for people living alone to contact the hospital when they are sick. Therefore, we have developed a model that can detect when a patient is ill and report back to the hospital. The system currently only identifies patients with heart disease and reports back to the hospital. We decided to go with heart disease identification because it is one of the most deadly diseases, and the risk of patients dying because of heart disease is high. Predicting whether a patient has heart disease or not is very clearly a classification problem. Therefore, we have used five models to classify. We take several factors such as blood sugar level, age, cholesterol level, and many more and give the outcome based on the input. Â© 2022 IEEE.
Development of Multifunctional Thin Film Based X-Ray Intensity Filters for Space-Based Payloads
(2019) Prajwal, K.; Dey, A.; Sudhakar, M.; Nandi, A.; Esther, A.C.M.; Sridhara, N.; Yougandar, B.; Kumar, P.; Arya, S.B.; Rajendra, A.
We report the development, thorough characterizations and space worthiness studies of multifunctional aluminized film as x-ray intensity filter for space-based payloads, suitably designed to place in Sun Earth Lagrangian (L1) point. The L1 point is the ideal location for uninterrupted observation of Sun to study the solar flares in hard x-rays. For our specific purpose, we make use of two different types of x-ray detectors (e.g., CdTe and CZT) which are generally used for hard x-ray studies in the energy band of 5 to 200 keV. Further, these aforesaid two detectors require specified thermal control characteristic for optimal performance. Aluminization of Kapton films is proposed which would satisfy the thermo-optical and x-ray transmission requirements of the proposed payload. The developed aluminized films are thoroughly studied by field emission scanning electron microscopy and atomic force microscopy techniques for micro-structural characteristic, x-ray diffraction for phase purity, nanoindentation for mechanical integrity at micro-structural length scale and spectrophotometer for thermo-optical properties. X-ray transmission test is carried out with two radioactive sources, namely 55Fe and 241Am, with various aluminized Kapton layer combinations. Finally, space worthiness of the aluminized Kapton films is examined by accelerated environments, e.g. humidity, thermal cycling and thermo-vacuum tests. 2019, ASM International.
Development of Multifunctional Thin Film Based X-Ray Intensity Filters for Space-Based Payloads
(Springer New York LLC barbara.b.bertram@gsk.com, 2019) Prajwal, K.; Dey, A.; Sudhakar, M.; Nandi, A.; Esther, A.C.M.; Sridhara, N.; Yougandar, B.; Kumar, P.; Arya, S.; Rajendra, A.
We report the development, thorough characterizations and space worthiness studies of multifunctional aluminized film as x-ray intensity filter for space-based payloads, suitably designed to place in Sun–Earth Lagrangian (L1) point. The L1 point is the ideal location for uninterrupted observation of Sun to study the solar flares in hard x-rays. For our specific purpose, we make use of two different types of x-ray detectors (e.g., CdTe and CZT) which are generally used for hard x-ray studies in the energy band of 5 to 200 keV. Further, these aforesaid two detectors require specified thermal control characteristic for optimal performance. Aluminization of Kapton films is proposed which would satisfy the thermo-optical and x-ray transmission requirements of the proposed payload. The developed aluminized films are thoroughly studied by field emission scanning electron microscopy and atomic force microscopy techniques for micro-structural characteristic, x-ray diffraction for phase purity, nanoindentation for mechanical integrity at micro-structural length scale and spectrophotometer for thermo-optical properties. X-ray transmission test is carried out with two radioactive sources, namely 55Fe and 241Am, with various aluminized Kapton layer combinations. Finally, space worthiness of the aluminized Kapton films is examined by accelerated environments, e.g. humidity, thermal cycling and thermo-vacuum tests. © 2019, ASM International.
Development of reflective co-sputtered nanostructured metallic films
(Taylor and Francis Ltd., 2021) Prajwal, K.; Priyanka, G.L.; Hasan, M.A.; Carmel Mary Esther, A.; Sridhara, N.; Rajendra, A.; Arya, S.B.; Dey, A.
DC magnetron co-sputtering technique is utilised to develop reflective Ag- and Al-based metal films co-sputtered with Ni deposited on quartz glass substrates. The sputtered films are characterised by field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM) and X-ray diffraction (XRD) techniques to investigate microstructure, topology and phase analysis, respectively. Further, average thermo-optical properties such as solar reflectance, absorptance and IR emittance and electrical property such as sheet resistance of the deposited films are evaluated. The reflectance property as a function of wavelength is also investigated. Sputtered Ag and Al films show high (>93%) reflectance, however, co-sputtered Al + Ni and Ag + Ni offer comparatively lesser value, e.g. 45% and 73%, respectively. The significant lower reflectance of Al + Ni is possibly due to the presence of higher amount of Ni in the film and the formation of intermetallic compounds. © 2020 Institute of Materials, Minerals and Mining Published by Taylor & Francis on behalf of the Institute.
Language Detection in Overlapping Multilingual Speech: A Focus on Indian Languages
(Institute of Electrical and Electronics Engineers Inc., 2025) Kolsur, A.A.; Prajwal, K.; Vijayasenan, D.
The growing demand for technology capable of recognizing spoken languages and extracting information from real-world audio, especially in scenarios with overlapping speech, has become a significant focus of research due to its essential role in improving global connectivity and accessibility. In our paper, we focus on identifying languages present in audio files that consist of overlapping speech. We have focused our research particularly on Indian languages, as there is limited research on identifying low-resource languages in overlapping speech. In this paper, we have synthesized a custom dataset from the VoxLingua107 dataset due to the lack of overlapping Indian speech data. Further, we have developed a novel solution that first separates the overlapped audio using a speaker separation model and then uses a language recognition model to detect the languages present in the separated audio. We have compared the results obtained through our method with the current state-of-the-art model, Whisper, and concluded that our solution significantly outperforms the Whisper model. The results highlight the potential for significant improvements in multilingual communication systems and speech processing applications, paving the way for more inclusive and accurate language recognition technologies. Â© 2025 IEEE.
Multi-Vehicle Tracking and Speed Estimation Model using Deep Learning
(Association for Computing Machinery, 2022) Prajwal, K.; Navaneeth, P.; Tharun, K.; Anand Kumar, M.A.
Speed estimation of vehicles is one of the prime application of speed estimation of moving objects. The YOLOv5 model has proven to have a very good accuracy in detecting moving objects in real-time. The vehicles on the road are extracted from each frame of the video by running it through a custom YOLOv5 object detector. The YOLO model splits the frame into a grid and each grid detects a vehicle within itself. An instance identifier tracks the vehicle across the frames. The tracking algorithm computes deep features for every bounding box and utilizes the similarities within the deep features to identify and track the object. The pixel per meter metric has to adjusted based on perspective after which the speed of the vehicle can be estimated. Finally a comparison of our model metrics with the existing state of the art models is provided. Â© 2022 ACM.
RF transparent vanadium oxide based single and bi-layer thin films as passive thermal control element for satellite antenna application
(2018) Prajwal, K.; Carmel, Mary, Esther, A.; Dey, A.
Germanium coated black polyimide (GBP) is often used as passive thermal control element for sunshield membrane of satellite antenna. However, GBP degrades fast while there is no protective coating applied. The present work is aimed towards the development of protective films which could hinder the degradation of GBP. At the same time, the basic characteristic of GBP membrane that is RF transparency should not be trade off. Here, RF transparent and protective vanadium oxide (VO) and vanadium oxide/silicon dioxide (VO/SO) thin films are developed by RF magnetron sputtering technique on GBP at a constant 400 W. Field emission scanning electron microscopy (FESEM) and X-ray photoelectron spectroscopy (XPS) techniques are utilized to investigate microstructural and oxide characteristics, respectively. Thermo-optical properties such as, solar absorptance (?s) and IR emittance (?ir) are also evaluated. Introduction of SiO2 layer over vanadium oxide layer leads to decrease in ?s to about 12%. RF losses e.g. insertion loss and return loss are measured in Ka band (27 39 GHz) and they found to be RF transparent characteristic. Thermal stability of the oxide films are also studied by differential scanning calorimetry (DSC) technique. 2018 Elsevier Ltd and Techna Group S.r.l.
RF transparent vanadium oxide based single and bi-layer thin films as passive thermal control element for satellite antenna application
(Elsevier Ltd, 2018) Prajwal, K.; Carmel Mary Esther, A.; Dey, A.
Germanium coated black polyimide (GBP) is often used as passive thermal control element for sunshield membrane of satellite antenna. However, GBP degrades fast while there is no protective coating applied. The present work is aimed towards the development of protective films which could hinder the degradation of GBP. At the same time, the basic characteristic of GBP membrane that is RF transparency should not be trade off. Here, RF transparent and protective vanadium oxide (VO) and vanadium oxide/silicon dioxide (VO/SO) thin films are developed by RF magnetron sputtering technique on GBP at a constant 400 W. Field emission scanning electron microscopy (FESEM) and X-ray photoelectron spectroscopy (XPS) techniques are utilized to investigate microstructural and oxide characteristics, respectively. Thermo-optical properties such as, solar absorptance (?s) and IR emittance (?ir) are also evaluated. Introduction of SiO2 layer over vanadium oxide layer leads to decrease in ?s to about 12%. RF losses e.g. insertion loss and return loss are measured in Ka band (27–39 GHz) and they found to be RF transparent characteristic. Thermal stability of the oxide films are also studied by differential scanning calorimetry (DSC) technique. © 2018 Elsevier Ltd and Techna Group S.r.l.