Rohan Roy

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Papers by Rohan Roy

Segmental Schwannomatosis of the Lower Extremity – A Case Series

Neurology India

Analysis of the Long-Term Outcome in Open Carpal Tunnel Release Surgeries with and without External Neurolysis of Median Nerve, Using Boston Carpal Tunnel Questionnaire (BCTQ)–Hindi Version

Journal of Neurosciences in Rural Practice

Background The effectiveness of open carpal tunnel release (OCTR) in treating carpal tunnel syndr... more Background The effectiveness of open carpal tunnel release (OCTR) in treating carpal tunnel syndrome (CTS) is well known. However, the role of ancillary external neurolysis of the median nerve is not well-documented. The Boston carpal tunnel questionnaire (BCTQ) is a commonly used disease-specific outcome instrument for CTS, which is validated across major languages of the world. No such validated Hindi version of BCTQ exists. Objectives To analyze and compare the long-term outcome in patients who underwent OCTR alone and OCTR with external neurolysis of the median nerve, using BCTQ–Hindi version, while checking its validity. Materials and Methods A retrospective, cross-sectional study was conducted at a tertiary care institute. The BCTQ was translated into Hindi language by a language expert. Eighty-four consecutive patients who underwent either unilateral/bilateral OCTR, with or without external neurolysis of the median nerve, between 2009 and 2019 were included in the study. Outc...

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Ceftazidime-resistant Burkholderia pseudomallei masquerading as isolated atypical neuromelioidosis

Indian Journal of Medical Microbiology

Hydropower: Its Amazing Potential-A Theoretical Perspective

With the energy becoming the current catch phase in business, industry and society, energy altern... more With the energy becoming the current catch phase in business, industry and society, energy alternative are becoming increasingly popular. Hydroelectricity exists as one option to meet the growing demand for energy and also a reliable renewable resource. In simple terms, inexpensive and reliable electricity is critical to the sustained economic growth and security of any nation. Today's world is dependent on reliable, low cost and abundant energy. In nature energy cannot be created or destroyed, but its form can change. People have been using water to their advantage for thousands of years. With the passage of the time they are now using moving water for power generation. By using water for power generation, people have worked nature to achieve a better life style. In generating hydropower electricity kinetic energy of moving water is converted to electrical energy. Since water is the initial source of energy, we call this hydroelectric power or hydropower in short. Worldwide, an...

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Sparse Encoding Algorithm for Real-Time ECG Compression

Recent Trends in Signal and Image Processing, 2018

In this paper, we propose a sparse encoding algorithm consisting of two schemes namely geometry-b... more In this paper, we propose a sparse encoding algorithm consisting of two schemes namely geometry-based method (GBM) and the wavelet transform-based iterative thresholding (WTIT). The sub-algorithm GBM reduces the minimal ECG voltage values to zero level. Subsequently, WTIT encodes the ECG signal in time-frequency domain, obtaining high sparsity levels. Compressed Row Huffman Coding (CRHC) algorithm converts the sparse matrices into compressed, transmittable matrices. The performance of the algorithms is validated in terms of compression ratio (CR), percentage RMS difference (PRD), and time complexity.

Student Permanent Transfer 2014 Seat Allocatation Report Non-NRI - B.F.Tech

UREQA: Leveraging Operation-Aware Error Rates for Effective Quantum Circuit Mapping on NISQ-Era Quantum Computers

Noisy Intermediate-Scale Quantum (NISQ) computers are enabling development and evaluation of real... more Noisy Intermediate-Scale Quantum (NISQ) computers are enabling development and evaluation of real quantum algorithms, but due to their highly erroneous nature, careful selection of qubits to map the algorithm on to real hardware is required to minimize the error rate of the algorithm output. In this paper, we propose UREQA, a new approach that introduces quantum-operation-aware error rate prediction to minimize of output errors of quantum algorithms running on NISQ devices.

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Model of real time biomedical signal transmission using wavelet based adaptive thresholding

2017 IEEE Calcutta Conference (CALCON), 2017

In real time, remote biomedical signal (such as ECG, EEG, etc.) monitoring systems, continuous fa... more In real time, remote biomedical signal (such as ECG, EEG, etc.) monitoring systems, continuous fast transmission of the signal is of utmost importance. In this paper, we propose a time-efficient algorithm for compression of ECG signal which involves decomposition of signal into coefficients of time-frequency domain. The proposed algorithm uses an adaptive frame positioning technique with an iterative thresholding selection process based on the detailed coefficients of discrete wavelet transform (DWT). Various parameters used in our proposed Vertical Frame Sliding Method (VFSM) algorithm are optimised to yield better performance. The performance of our algorithm have been evaluated in terms of Compression Ratio (CR) and Percentage root mean square deviation (PRD).

Analysing the Viability of Replacing Sand with Glass Powder in Concrete using Fly Ash

International Journal For Science Technology And Engineering, 2016

The alteration in quantities for preparing sundry concrete mix has been a great challenge for the... more The alteration in quantities for preparing sundry concrete mix has been a great challenge for the concrete industry. The present work investigates replacement of sand and cement with glass powder (GP) and fly ash (FA) respectively. GP being rich in silica has the potential to replace sand as fine aggregate in concrete. The propensity of using FA as a supplementary cementitious material was done to improve the properties of concrete that utilized finely crushed waste GP, especially with regards to inhibit the alkalisilica reaction (ASR). This proportionate replacement of sand with GP can possibly solve the ongoing crisis of sand procurement through mining which is a direct cause of erosion. The term environmental economics has been used to analyse the burgeoning effects on nature and to alleviate the increasing cost of construction. The GP was used in proportions of 0%, 5%, 10%, 15% and 20% as a fine aggregate replacement. An experimental study was made where compression strength, flexural strength, tensile strength and modulus of elasticity of proportioned concrete mixes were examined and compared. Therefore viable improvisation can be done by using FA and GP as binders to make an efficacious concrete.

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State of the Art on Bamboo- A Viable Tool in Construction

The present work investigates on use of bamboo and its application in the field of construction. ... more The present work investigates on use of bamboo and its application in the field of construction. Across the world, people have been using bamboo in construction for millennia. Its strong and lightweight characteristic gives an easy to build option in bamboo construction. Moreover it is resilient to wind, earthquake forces and readily repairable in the event of damage. This paper lays down emphasis on key parameters of viable use of bamboo in construction such as housing, protection of bamboo components, it’s associated products (bamboo based panels and bamboo reinforced concrete) and various jointing techniques. As a renewable material, with incredibly fast growth rate and properties similar to wood, bamboo has the potential to play an important role in meeting construction needs for a rapidly urbanizing world in an environmentally sustainable way. Therefore constructive improvisation needs to be done in order to exploit bamboo as a construction material and further burgeoning effor...

Development of an Automatic Thread Tension Adjusting Device for Single Needle Lock Stitch Machine

Lecture Notes in Mechanical Engineering, 2021

Go west: Bristol and the post-Brexit immigration system

A 35 Gb/s junction-less dual parallel Mach-Zehnder modulator for short reach interconnects

Microsystem Technologies, 2021

An electrostatic doping (ED) based 35 Gb/s dual-parallel Mach-Zehnder modulator (DP-MZM) for phot... more An electrostatic doping (ED) based 35 Gb/s dual-parallel Mach-Zehnder modulator (DP-MZM) for photonic integrated circuits (PICs) is proposed and analyzed. Theoretical formulation of the transfer function and linearity analysis of the proposed modulator is also presented here. The proposed modulator contains two ED-aided sub-MZMs and an ED-aided optical phase shifter (PS) in a MZI structure. Numerical simulations are performed using commercially available tools and the simulation results are presented here. From the results we estimate that the proposed DP-MZM with 400 μm long sub-MZMs can offer peak dynamic extinction ratio (ER) of 14 dB with maximum 8.7 dB of insertion loss (IL) at 10 Gb/s data rate. Using dual-tone test method, the predicted spurious free dynamic range (SFDR) of the modulator are 62.74 dB·Hz1/2 and 99.35 dB·Hz $$^{2/3}$$ for second and third harmonic intermodulation distortions (IMD2 and IMD3), respectively. From the transient analysis, the estimated maximum operating frequency and 3-dB EO bandwidth of the modulator are approximately 35.5 GHz and 32.37 GHz, respectively. At maximum data rate, 5.89 dB of dynamic ER is offered by the proposed DP-MZM for OOK modulation. Simulation verifies successful transmission of 25 Gb/s OOK modulated PRBS data stream over a 10 km standard single mode fiber (SSMF) link. Furthermore, we have shown that the proposed DP-MZM is capable of generating 50 Gb/s PAM-4 signal, which makes the modulator suitable for next-generation short-reach interconnects.

‘Fairest of Peruvian Maids’: Planting Cinchonas in British India

Malarial Subjects

The real Eldorado of India is Cinchona. 1 Where Andes hides his cloud-wreathed crest in snow And ... more The real Eldorado of India is Cinchona. 1 Where Andes hides his cloud-wreathed crest in snow And roots his base on burning sands below; Cinchona, fairest of Peruvian maids, To health's bright goddess, in the breezy glades Of Quito's temperate plains, an altar reared, Trilled the loud hymn, the solemn prayer preferred. 2 Europeans owed their initial encounters with cinchona plants to the consolidation of Spanish imperial rule in the interiors of South America. As objects of commerce and knowledge, cinchonas had been made to travel from South America to various corners of Europe and beyond since the mid-seventeenth century. 3 However the mid-nineteenth century was particularly significant in the history of the cinchonas as the Dutch, British and French colonial governments began to express a new interest in these plants. The 1850s, as many historians have shown, witnessed the beginnings of organised attempts to collect and transport cinchona seeds and plants from 'natural' South American forests towards the sites of 'experimental plantations' in colonial Africa and the East and

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Introduction Nonhuman Empires

Comparative Studies of South Asia, Africa and the Middle East, 2015

"Nonhuman(Empires"(contributes(to(a(critique(of(anthropocentrism(in(the(field(of(imperial(history... more "Nonhuman(Empires"(contributes(to(a(critique(of(anthropocentrism(in(the(field(of(imperial(history.(It(reveals(the(variety(of(ways(in(which(the(historical(trajectories(of(nonhuman(animals(and(empires(intersected,(and(informed(one(another.(Beyond(merely(rehabilitating(nonhuman(themes(in(conversations(about(imperial(history,(it(provides(a(platform(for(rethinking(both(nonhumans(and(empires(as(they(are(envisioned(conventionally(in(the(historiography.(This(introductory(article(begins(by(situating(this(special(section(as(a(conversation(between(science(studies,(and(animal(studies,(on(the(one(hand,(and(the(historiography(of(empires,(on(the(other.(It(then(proceeds(to(suggest(ways(to(reK conceptualize(agency,(subjects,(nonhumans,(and(empire(by(combining(certain(shared(concerns(of(subaltern(studies(and(actorKnetwork(theory.(The(paper(ends(by(emphasizing(the(need(to(integrate(postcolonial(critiques(with(emerging(scholarship(about(the(posthuman.

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White Ants, Empire, and Entomo-Politics in South Asia

The Historical Journal, 2019

By focusing on the history of white ants in colonial South Asia, this article shows how insects w... more By focusing on the history of white ants in colonial South Asia, this article shows how insects were ubiquitous and fundamental to the shaping of British colonial power. British rule in India was vulnerable to white ants because these insects consumed paper and wood, the key material foundations of the colonial state. The white ant problem also made the colonial state more resilient and intrusive. The sphere of strict governmental intervention was extended to include both animate and inanimate non-humans, while these insects were invoked as symbols to characterize colonized landscapes, peoples, and cultures. Nonetheless, encounters with white ants were not entirely within the control of the colonial state. Despite effective state intervention, white ants did not vanish altogether, and remained objects of everyday control until the final decade of colonial rule and after. Meanwhile, colonized and post-colonial South Asians used white ants to articulate their own distinct political ag...

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Weld defect identification in friction stir welding using power spectral density

IOP Conference Series: Materials Science and Engineering, 2018

Power spectral density estimates are powerful in extraction of useful information retained in sig... more Power spectral density estimates are powerful in extraction of useful information retained in signal. In the current research work classical periodogram and Welch periodogram algorithms are used for the estimation of power spectral density for vertical force signal and transverse force signal acquired during friction stir welding process. The estimated spectral densities reveal notable insight in identification of defects in friction stir welded samples. It was observed that higher spectral density against each process signals is a key indication in identifying the presence of possible internal defects in the welded samples. The developed methodology can offer preliminary information regarding presence of internal defects in friction stir welded samples can be best accepted as first level of safeguard in monitoring the friction stir welding process.

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Performance analysis of an electrostatic doping assisted silicon microring modulator

Optics Communications, 2019

In this paper, we propose and numerically analyze electrostatic doping (ED) assisted silicon micr... more In this paper, we propose and numerically analyze electrostatic doping (ED) assisted silicon microring modulator (MRM) realizable on SOI platform having ∼ 10 nm free spectral range (FSR). The proposed modulator consists of a vertical metal-insulator-semiconductor (MIS) junction and a lateral metal-semiconductor (MS) junction. It utilizes ED to achieve free carriers inside the rib waveguide that eventually introduces the free carrier plasma dispersion effect. The proposed device does not employ any lateral or vertical PN or PIN junction and offers high operating speed with negligible static power consumption. Numerical simulation using commercially available TCAD tools and mode solvers are used to estimate the performance of the proposed modulators. Palladium (Pd) and aluminum (Al) are used as electrodes to realize ED enabled MIS-MS charge plasma diode. The performance of the proposed modulator is extensively studied both in steady state and transient state. Results predict that a maximum 37.8 dB and 33 dB of extinction ratio (ER) is achievable by the modulator while operating in inversion and accumulation mode, respectively. Predicted insertion losses are 1.97 dB and 1.49 dB when operated in inversion and accumulation mode respectively. The proposed modulator is expected to provide a maximum of 26.3 Gbps and 32.2 Gbps operating speed with a 9.21 GHz and 11.9 GHz of 3-dB optical bandwidth in inversion and accumulation mode of operation, respectively. Simulation result predicts that the dynamic energy per bit for the proposed ED assisted MRM is approximately 31 fJ/bit and 68 fJ/bit in inversion and accumulation mode of operation, respectively.

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Performance evaluation of low cost microfluidic chips made using a digital craft cutter for point of care applications in nucleic acid tests

2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2014

A point of care (POC) diagnostic system development for nucleic acid testing (NAT) for developing... more A point of care (POC) diagnostic system development for nucleic acid testing (NAT) for developing countries faces several challenges and barriers among which affordability is a very critical one [1,4]. Hence a study was made to evaluate the effectiveness of microfluidic chips made from a digital craft cutter to be used as a disposable cartridge. Low cost materials like double sided tapes, transparent sheets and connectors were used to realize the microfluidic chip [2]. An in-house IVD sample preparation kit for nucleic acid extraction was used as a representative assay. Modifications were made to the assay workflow considering the feature sizes, design and volume of the microfluidic chip made from the paper cutter and other POC system requirements like turnaround time (TAT). The workflow was optimized by reducing overall TAT from 50min to 15min, sample volume from 150 μL to 12.5 μL and reduced reagent volumes. The method was also optimized to work at an isothermal condition. The results showed good correlation and yield in terms of both quality and quantity when compared to results obtained from the established baseline protocol. Thus microfluidic chips made using a digital craft cutter can very well be a low cost alternative to manufacture disposable chips for POC applications in nucleic acid tests.

Quinine, mosquitoes and empire: reassembling malaria in British India, 1890–1910

South Asian History and Culture, 2013

The drug quinine figured as an object of enforced consumption in British India between the late 1... more The drug quinine figured as an object of enforced consumption in British India between the late 1890s and the 1910s, when the corresponding diagnostic category malaria itself was redefined as a mosquito-borne fever disease. This article details an overlapping milieu in which quinine, mosquitoes and malaria emerged as intrinsic components of shared and symbiotic histories. It combines insights from new imperial histories, constructivism in the histories of medicine and literature about non-humans in science studies to examine the ways in which histories of insects, drugs, disease and empire interacted and shaped one another. Firstly, it locates the production of historical intimacies between quinine, malaria and mosquitoes within the exigencies and apparatuses of imperial rule. In so doing, it explores the intersections between the worlds of colonial governance, medical knowledge, vernacular markets and pharmaceutical business. Secondly, it outlines ways to narrate characteristics and enabling properties of non-humans (such as quinines and mosquitoes) while retaining a constructivist critique of scientism and empire. Thirdly, it shows how empire itself was reshaped and reinforced while occasioning the proliferation of categories and entities like malaria, quinine and mosquitoes.

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