Anubhav Tiwari - Academia.edu (original) (raw)

Papers by Anubhav Tiwari

Volume 4: Biomedical and Biotechnology; Design, Systems, and Complexity

Creating a system to analyse human jaw motion is required for people affected with Temporomandibu... more Creating a system to analyse human jaw motion is required for people affected with Temporomandibular Disorder. A guiding system is required for creating the rehabilitation steps in such cases. Currently, capturing and estimating the kinematics for the Temporomandibular Joint (TMJ) is difficult due to its intricate position. The capture of the motion by using the stationary camera is a common practice in the available market and gives a reasonable output; However, the setup cost of this instrument setup is too high. Hence, there is a need for a sensor system that is cost-effective and portable in nature. A sensory system is required which can record the kinematics of the motion of the jaw system with the required accuracy. In this paper, a simple system is proposed to capture the required information. The system would require a computer in close vicinity and would rely on a few software for post-processing of the signals obtained from the system. This could be used to reproduce the f...

Jindal Global Law Review

Assam has been a site for a hugely contested project of (re)determining an Indian ‘citizen’ throu... more Assam has been a site for a hugely contested project of (re)determining an Indian ‘citizen’ through a purely identity document–based administrative legal exercise. Verification of citizenship-related documents has been a ubiquitous reality in Assam, almost since India’s independence, but in recent years, more pertinently, as a result of the Supreme Court–monitored update of the National Register of Citizens (NRC) in Assam. The NRC’s interwoven relationship with the existing legal framework applicable to ‘foreigners’, particularly with the role of the Foreigners Tribunals (FT) in the state, creates a ‘legal’ picture of individuals, based on an incessant reliance on State-recognised identification documents. Law, thus, comes across as highly technocratic, with the potential to ignore the human aspects of deprivation of citizenship status as well as the hardships and anxieties around citizenship determination processes. One of the critical perspectives on such a legal outlook is to divert the spotlight towards the people’s experiences, particularly the marginalised, and their interactions with such legal, bureaucratic citizenship determination processes. Drawing from narratives from a study conducted in Assam between June and August 2018, this article seeks to provide a contextual analysis around the question of the potential legal violence unleashed by the NRC exercise which sought to ‘update’ the register of Indian citizens in Assam and exclude ‘foreigners’ pending appeals before the FTs. It puts forth the argument that certain marginalised and vulnerable persons experienced violence sanctioned by law during the NRC process itself due to the Supreme Court’s ignorance and its preoccupation with the image of the ‘illegal migrant’. Therefore, this article is an attempt to contextualise the potential violent effects of law in identifying the ‘other’ in relation to the Indian ‘citizen’ during the NRC, conducted under the supervision of the Supreme Court, which should also have been concerned with the implementation of fundamental rights under the Constitution for the marginalised and the vulnerable.

Applied Sciences, 2022

The purpose of this study is to design a patient-specific TMJ implant and study its behaviour und... more The purpose of this study is to design a patient-specific TMJ implant and study its behaviour under different loading conditions compared with natural intact TMJ. There are several diseases, which affect the proper growth and function of TMJ, and in some cases, TMJ injury results from accidents. To repair the TMJ, temporomandibular joint replacement or TJR surgery is performed. In this work, CT-scan data of the skull and mandible region with broken condylar head were used to study the biomechanical behaviour of the intact mandible and customized TMJ prostheses in order to design a patient-specific total TMJ implant. The customized TMJ implant was virtually studied under simulated loading conditions using finite element method (FEM) in ANSYS Workbench and then compared to the intact jaw-mandible for the combinations of two different biocompatible material models. It is observed that the natural TMJ has a higher deformation value as compared to the patient-specific TMJ implant due to ...

2020 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (ASONAM), 2020

being able to halt the spread of this and future unknown infectious disease outbreak more effecti... more being able to halt the spread of this and future unknown infectious disease outbreak more effectively and efficiently. In this paper, we developed an interactive visualization platform 1 to closely monitor the global COVID-19 situation and the social media & news reports. Besides showing the latest COVID-19 cases numbers, the platform preserves the historical records and enable users to see the COVID-19 spreading trends. In addition, the platform collects and digests the tweets streams and grab people's top concern, providing users a One-stop experience of the overview COVID-19 situation. To summarize, our platform has the following contributions:

Diagnostics, 2020

Dermatoscopy, high-frequency ultrasonography (HFUS) and spectrophotometry are promising quantitat... more Dermatoscopy, high-frequency ultrasonography (HFUS) and spectrophotometry are promising quantitative imaging techniques for the investigation and diagnostics of cutaneous melanocytic tumors. In this paper, we propose the hybrid technique and automatic prognostic models by combining the quantitative image parameters of ultrasonic B-scan images, dermatoscopic and spectrophotometric images (melanin, blood and collagen) to increase accuracy in the diagnostics of cutaneous melanoma. The extracted sets of various quantitative parameters and features of dermatoscopic, ultrasonic and spectrometric images were used to develop the four different classification models: logistic regression (LR), linear discriminant analysis (LDA), support vector machine (SVM) and Naive Bayes. The results were compared to the combination of only two techniques out of three. The reliable differentiation between melanocytic naevus and melanoma were achieved by the proposed technique. The accuracy of more than 90% ...

TIJ's Research Journal of Economics & Business Studies - RJEBS, 2019

This paper discusses the case of Afghanistan as a potential business hub for South Asia with trem... more This paper discusses the case of Afghanistan as a potential business hub for South Asia with tremendous investment opportunities as well as inherent issues and Challenges. It relates the story of Afghanistan being transformed from a War torn country to a sovereign republic with high hopes and immense possibilities. Despite being land locked it is having a very strategic location as being surrounded by six different countries and having access to Central Asia on the north ,middle east through Iranian border on the west and Asian countries like China on the northeast & Pakistan on the east as well as south. Moreover the completion of the new trade route through Chabahar port in Iran and the Silk-route trade project has worked wonders for them as it can provide a business corridor through Afghanistan connecting South Asia with Central Asia as well as Middle East. This has a very special significance for developing this country as a potential business hub. Further Afghanistan’s member...

Smart Computing and Self-Adaptive Systems, 2021

2020 5th International Conference on Computing, Communication and Security (ICCCS), 2020

Smart Social Distancing is one of the effective ways to break chain of contagion. Simply by isola... more Smart Social Distancing is one of the effective ways to break chain of contagion. Simply by isolating symptomatic people will not be enough for slowing down the virus like COVID19, many asymptomatic individuals carry virus and can infect others. Hence a cost effective and highly efficient solution is required which provide an alert when any two or more users come in close vicinity of each other which is lower than the permissible safe distance limit. This paper presents how ST BlueNRG-2 based device enables social distancing solution; the device generates an alert if the two or more devices are at lesser distance than safe distance limit (for example 2 meters or less). Two devices are advertising and scanning together to check if any other beacon is detected. Mathematical filters are applied to reduce the variation of RSSI observed, even when the devices are at fixed distance. The advertised data can be randomized to keep the communication secure and avoid spoofing. State machine for different modes were implemented which includes different Low Power Modes state for longer battery life and high probability detection mode.

IOP Conference Series: Materials Science and Engineering, 2021

This research describes about the thermal analysis of fins by FEA method. Fins are extended surfa... more This research describes about the thermal analysis of fins by FEA method. Fins are extended surfaces which help to increase the heat transfer rate[1]. In this research we observe that when heat is produced in IC engine when fuel is burned, will have to be at higher level so that thermal efficiency increases, but to fend off from damages like thermal damage, useless or excess heat have to be removed from the engine. In air cooled engine, fins are placed at upper layer or on boundary of engine cylinder to increase heat transfer rate, because of this analysis of fins is very important and help to enhance the performance of engine and also increase the life span of the engine parts. The main aim of this research is to analyse the thermal properties of fins by varying certain conditions i.e. doing some modifications in conventional model, in our research work we have done two modifications in the fins geometry. In modified model-1 we have increased the number of fins, to achieve this we ...

Biomedical Signal Processing and Control, 2021

Abstract In this study microbubble (MB) cavitation signal analysis was performed in both pressure... more Abstract In this study microbubble (MB) cavitation signal analysis was performed in both pressure and exposure duration domains of the acoustic field with the aim to optimize current cavitation dosimetry model by the application of signal processing. The discrete wavelet transform is applied to denoise the non-stationary US signals. For the development of universal cavitation dosimetry model and unification of cavitation dosimetry protocols, we have defined the optimal frequency range to be associated with the highest values of differential inertial cavitation dose (ICD). At our experimental conditions, it was evaluated to be 1.5–1.8 MHz, as ICD, quantified in this frequency band, is clearly distinguished from ICD of other frequency ranges. The explicitly high RMS values, obtained in 1.5–1.8 MHz frequency range, not only allow to track MB dynamics with the highest accuracy but also perform sonoporation optimization in exposure duration scale by RMS decrease to the background level. For sonoporation temporal dosimetry we have introduced “MB survival time” - the estimate, based on system output characteristics and directly related to sonoporation outcome. The rate of “MB survival time” has high correlation (R = 0.85, p

Sensors, 2020

Analytical modelling is an efficient approach to estimate the directivity of a transducer generat... more Analytical modelling is an efficient approach to estimate the directivity of a transducer generating guided waves in the research field of ultrasonic non-destructive testing of the large and complex structures due to its short processing time as compared to the numerical modelling and experimental techniques. The wave patterns or the amplitude variations along the region of ultrasonic transducer itself depend on its behavior, excitation frequency, and the type of propagating wave mode. Depending on the wave-pattern of a propagating wave mode, the appropriate value of the amplitude correction factor must be multiplied to the amplitudes of the excitation signal for the accurate evaluation of directivity pattern of the ultrasonic transducers generating guided waves in analytical modelling. The objective of this work is to analyse the wave patterns under the region of macro-fiber composite (MFC) transducer to improve the accuracy of a previously developed analytical model for the predic...

Materiali in tehnologije, 2018

The accurate three-dimensional (3D) displacement profile of a contact-type ultrasonic transducer ... more The accurate three-dimensional (3D) displacement profile of a contact-type ultrasonic transducer ensures that the transducer is free of defects during its manufacturing or installation. It also ensures the applicability of the transducer in structural health monitoring (SHM) and non-destructive testing (NDT). Since its invention in 1996 by NASA, the macro-fiber composite (MFC) transducer was positively accepted by researchers due to its lightweight, flexibility, durability and reliability. As it can be embedded quite easily on the structure under inspection, there are different ways to which it can be used for the detection of defects in the composite materials using guided Lamb waves. The objective of the presented work was to investigate the operational performance of an unloaded macro fiber composite (MFC) transducer of P1-type by estimating its 3D displacement components. The 3D spatial displacements of vibrating MFC were investigated using a Polytec 3D scanning laser vibrometer (PSV-500-3D-HV) in order to determine the directions/planes along which the ultrasonic guide waves would be generated most effectively. The behaviour of the MFC transducer of P1 type based on the displacement characteristics confirmed that it works in d33 (elongation) mode, as specified in the manufacturer's specifications. Keywords: macro fiber composite, ultrasonic NDT, spatial displacements, Lamb waves, 3D-scanning laser vibrometer Natan~en tridimenzionalni profil (3D) premikov kontaknega ultrazvo~nega pretvornika omogo~a, da je le-ta brez napak med izdelavo ali namestitvijo. To namre~zagotavlja uporabnost pretvornika za strukturno zdravstveno opazovanje (angl. SHM) in neporu{no testiranje materialov (angl. NDT). NASA je leta 1996 izumila ultrazvo~ni kompozitni pretvornik na osnovi makrovlaken (MFC; angl.: Macro-Fiber Composite). Raziskovalci so potem pretvornik kmalu pozitivno sprejeli zaradi njegove majhne mase, prilagodljivosti, trajnosti in zanesljivosti. Obstajajo razli~ni na~ini njegove uporabe za odkrivanje napak v kompozitnih materialih z uporabo kontroliranih Lambovih valov, ker ga je zelo lahko namestiti na preiskovano strukturo. Predmet raziskave predstavljene v tem~lanku, so lastnosti obratovanja neobremenjenega MFC-pretvornika tipa P1 z oceno njegovih 3D-premikov. Prostorske premike vibrirajo~ega MFC so avtorji preiskovali s 3D-laserskim skenirnim vibrometrom Polytec (PSV-500-3D-HV) in s tem dolo~ili smeri in ravnine, vzdol`katerih so vodeni ultrazvo~ni valovi najbolj u~inkovito generirani. Potrdili so, da le-ta deluje v na~inu d33 (raztezek) in da so karakteristike obna{anja MFC pretvornika tipa P1 v skladu s proizvajal~evo specifikacijo. Klju~ne besede: kompozit iz makrovlaken, ultrazvo~na neporu{na preiskava (NDT), prostorski premiki, Lambovi valovi, 3D-laserski skenirni vibrometer

Journal of Vibroengineering, 2017

The presented work demonstrates the most suitable architecture for the FPGA-based signal processi... more The presented work demonstrates the most suitable architecture for the FPGA-based signal processing which makes available various real-time filtering algorithms, such as band pass, high pass, low pass, and band-reject for FIR filters. The processor was implemented with the fixed-point arithmetic using VHDL, which can be downloadable on FPGA device. The FPGA device can be interfaced with an analog-to-digital converter (ADC), digital-to-analog converter (DAC) and a personal computer with MATLAB for the user interface and feeding coefficients and order of the filter. The core part of this paper was to find the reconfigurable and efficient architecture of the processor with only one multiplier which can work for Finite Impulse response (FIR) filter with the best- suited structure. The system will be used for automatic generation of fixed-point FIR filters. The model was also implemented in MATLAB script and the verification of results in the case of low-pass filtering confirmed that bot...

Electronics, 2019

The estimation of the size and location of defects in multi-layered composite structures by ultra... more The estimation of the size and location of defects in multi-layered composite structures by ultrasonic non-destructive testing using guided waves has attracted the attention of researchers for the last few decades. Although extensive signal processing techniques are available, there are only a few studies available based on image processing of the ultrasonic B-scan image to extract the size and location of defects via the process of ultrasonic non-destructive testing. This work presents an image processing technique for ultrasonic B-scan images to improve the estimation of the location and size of disbond-type defects in glass fiber-reinforced plastic materials with 25-mm and 51-mm diameters. The sample is a segment of a wind turbine blade with a variable thickness ranging from 3 to 24 mm. The experiment is performed by using a low-frequency ultrasonic system and a pair of contact-type piezoceramic transducers kept apart by a 50-mm distance and embedded on a moving mechanical panel....

Procedia Structural Integrity, 2018

During their operation, modern aircraft engine components are subjected to increasingly demanding... more During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data.

The Journal of Strain Analysis for Engineering Design, 2018

In this work, the most promising ultrasonic signal processing methods—discrete wavelet transform,... more In this work, the most promising ultrasonic signal processing methods—discrete wavelet transform, variational mode decomposition and Hilbert transform—are applied for the analysis of disbond-type defects in the segment of wind turbine blade. Two disbond-type artificial defects having diameters of 81 and 25 mm were located on the main spar of wind turbine blade. The low-frequency ultrasonic system developed by Ultrasound Research Institute of the Kaunas University of Technology was used for the experimental investigation of wind turbine blade using guided waves and only one side of the blade segment was accessed. Two contact type ultrasonic transducers separated by 50 mm distance and fixed on a movable mechanical panel were used as a transmitter–receiver pair during the experiment for the ultrasonic signals recording up to the scanning distance of 250 mm with the scanning step of 1 mm. Both types of defects were marginally detected from the conventional experimental B-scan and theref...

Sensors (Basel, Switzerland), Jan 9, 2017

This work proposes a novel hybrid signal processing technique to extract information on disbond-t... more This work proposes a novel hybrid signal processing technique to extract information on disbond-type defects from a single B-scan in the process of non-destructive testing (NDT) of glass fiber reinforced plastic (GFRP) material using ultrasonic guided waves (GW). The selected GFRP sample has been a segment of wind turbine blade, which possessed an aerodynamic shape. Two disbond type defects having diameters of 15 mm and 25 mm were artificially constructed on its trailing edge. The experiment has been performed using the low-frequency ultrasonic system developed at the Ultrasound Institute of Kaunas University of Technology and only one side of the sample was accessed. A special configuration of the transmitting and receiving transducers fixed on a movable panel with a separation distance of 50 mm was proposed for recording the ultrasonic guided wave signals at each one-millimeter step along the scanning distance up to 500 mm. Finally, the hybrid signal processing technique comprisin...