Shubham Singh - Academia.edu (original) (raw)

Papers by Shubham Singh

AIP Conference Proceedings

Fuel Cells have been around us for about 8 decades and boats for almost forever. In this paper, a... more Fuel Cells have been around us for about 8 decades and boats for almost forever. In this paper, a mode of water transport/vehicle is suggested. The idea is to use Solar Panel to harness the solar energy which is then fed to an Electrolyzer. The electrolyzer is fed with 2 inputs, water, and power. The water is split into Hydrogen and Oxygen by a process called Electrolysis. The hydrogen then becomes the input/fuel for a Proton Exchange Membrane Fuel Cell (PEMFC). PEMFC converts Hydrogen and Oxygen (present in Air) to power, which is supplied to a motor to run the propeller.The above idea has been simulated using MATLAB/SIMULINK.

2020 IEEE First International Conference on Smart Technologies for Power, Energy and Control (STPEC)

For a k-level multi-level inverter (MLI), several modulation techniques have been introduced in r... more For a k-level multi-level inverter (MLI), several modulation techniques have been introduced in recent years. Multiple carrier sinusoidal pulse width modulation (PWM) techniques are most popularly used due to its simplicity and effectiveness in minimizing the harmonic distortion in the output waveforms. Multiple carrier PWM is classified in level shifted PWM (LSPWM) and phase shifted PWM, out of which LSPWM delivers better harmonic profile. But LSPWM has the problem of uneven heat distribution, which limits its outreach in applications of high power. To solve the problem carrier rotation strategy is used in which carrier is rotated so that each switch conducts for equal durations. In this paper, carrier has been rotated at different rotation frequencies for five level, seven level and nine level cascaded H-bridge MLI and comparative THD analysis is performed. A new carrier rotation method has been proposed in which carrier is rotated at a rotation frequency three times the frequency of reference signal. Also, two algorithms are presented to calculate the periods of device conduction in new carrier rotation method. To showcase the improved performance, parameters of proposed carrier rotation method and phase disposition PWM (no rotation) are compared.

Computers & Industrial Engineering, 2021

Abstract An intuitive way to handle optimization problems with data affected by the uncertainty s... more Abstract An intuitive way to handle optimization problems with data affected by the uncertainty set is to undergo a robust optimization problem where the solution must be satisfied for any possible realization of the data in the uncertainty set. In this work, we addressed an uncertain linear programming problem in which some constraints involves the product of two uncertain parameters that are robust in nature. Hereafter, we discuss the max-min regret approach and subsequently with the help of Lagrangian duality, establish an equivalent approximation of the robust counterpart of such types of uncertain programming problems. Further, for the application purpose, we propose a multi-objective, multi-product production planning model of a captive repair shop for overhauling and repairing products or machines which indicates the relevance of the theoretical performance.

Comprehensive Natural Products III, 2020

This study develops an indirect optimal control solver based on the Homotopy Analysis Method. A f... more This study develops an indirect optimal control solver based on the Homotopy Analysis Method. A finite interval boundary value problem is generated by using the necessary conditions of optimality and applying the Pontryagin’s Minimum Principle. Validation of the solver is performed using comparisons with a collocation-based boundary value problem solver, MATLAB’s bvp4c. The results demonstrate how simple initial guess to the boundary value problem can be used to produce high quality solutions. The accuracy of the solutions can be increased by increasing the order of solution at the cost of computational resources.

2018 International Conference on Advanced Computation and Telecommunication (ICACAT), 2018

Physical layer Key generation is an attractive and recent alternative to achieve security in wire... more Physical layer Key generation is an attractive and recent alternative to achieve security in wireless networks. However, like other security algorithms, performance of physical layer key generation depends on randomness attained by generated keys. In this paper, different types of random tests like Frequency test, Serial test, Entropy test etc. are described and suitability of NIST statistical test suite for physical layer key generation is discussed. Furthermore, various applications of randomness are also briefly described. Since secrecy of key is crucial for wireless communication, a simulation model is developed for physical layer key generation and randomness of generated key is tested using NIST test suite. A set of arbitrary keys is also evaluated for randomness using NIST test. It is found that key generated using developed model is more random as compared to that of set of arbitrary keys. Therefore, this study suggests physical layer key generation as good candidature for a...

Polymers and Polymer Composites, 2021

This study investigates the free vibration responses of laminated composite sandwich beam with mu... more This study investigates the free vibration responses of laminated composite sandwich beam with multi-cores using experimental and numerical methods. The laminated composite face sheets are made by using hand layup method. An experimental modal test has been carried for different configurations of multi-core sandwich beams under different end conditions. The single-core and multi-core sandwich beams has been modeled and the natural frequencies of sandwich beams are determined using ANSYS software. The numerical model is verified by comparing the obtained natural frequencies with experimental results. The numerical and experimental results indicate that the multi-core sandwich beam greatly influences the structural stiffness compared with single-core sandwich beam under different end conditions. Furthermore, the influence of several parameters such as the end conditions, thickness of the core layer, and stacking sequence on the natural frequencies of the various configurations of the ...

Journal of Management and Research, 2014

The report analyses the concept of Foreign Direct Investment in India and studies it in various c... more The report analyses the concept of Foreign Direct Investment in India and studies it in various contexts like growth and policies implemented after the independence. With the economic direction of gradual increase in the liberalization and globalization, several factors influencing the patterns for the investment in India have also been discussed in the paper. The report entails the advantages and limits of FDI, main sectors with Equity/Route limit in India & factors affecting FDI with respect to Indian Economy. The paper purports to explain the purpose of studying this topic and gives insights on different proposals of encouraging the flow of foreign capital through FDI & analyzing the largest sectors of the investments in India. We have also performed case studies on organization such as PepsiCo, to justify our assumptions and to clarify the concepts.

Langmuir, 2020

The present article reports the hitherto unreported phenomenon of arrested evaporation dynamics i... more The present article reports the hitherto unreported phenomenon of arrested evaporation dynamics in pendent droplets in an electric field ambience. The evaporation kinetics of pendant droplets of electrically conducting saline solutions in the presence of a transverse, alternating electric field is investigated experimentally. It has been observed that while increase of field strength arrests the evaporation, increment in field frequency has the opposite effect. The same 2 has been explained on the solvation kinetics of the ions in the polar water. Theoretical analysis reveals that change in surface tension and diffusion driven evaporation model cannot predict the arrested or decelerated evaporation. With the aid of Particle Image Velocimetry, suppression of internal circulation velocity within the droplet is observed under electric field stimulus, and this affects the evaporation rate directly. A mathematical scaling model is proposed to quantify the effects of electrohydrodynamic circulation, electro-thermal and electro-solutal advection on the evaporation kinetics of the droplet. The analysis encompasses major governing parameters, viz. the thermal and solutal Marangoni numbers, the Electrohydrodynamic number, the electro-Prandtl and electro-Schmidt numbers and their respective contributions. It has been shown that the electro-thermal Marangoni effect is supressed by the electric field, leading to deteriorated evaporation rates. Additionally, the electro-solutal Marangoni effect further supresses the internal advection, which again arrests the evaporation rate by a larger proportion. Stability analysis reveals that the electric body force retards the stable internal circulation within such droplets and arrests advection. The stability mapping also illustrates that if the field strength is high enough for the electro-solutal advection to overshadow the solutal Marangoni effect completely, it can lead to improvement in evaporation rates. The present findings on the competitive electrohydrodynamic and electro-solutal behavior within pendant droplets may find strong implications in microscale flows involving aspects such as droplet electrokinetics, dielectrophoresis, and electrostriction and so on.

2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2018

Journal of Natural Resource Conservation and Management, 2020

A field experiment was conducted at School of Natural Resource Management, College of Post Gradua... more A field experiment was conducted at School of Natural Resource Management, College of Post Graduate Studies in Agricultural Sciences, Umiam, Meghalaya during kharif 2017 to investigate the influence of Azolla on soil acidity and nutrient availability in acid Inceptisol of Meghalaya. Rice (var. Shasharang) was raised as test crop with six treatments viz., control (T1), fresh Azolla incorporation @ 1.6 t ha-1 (T2), 30 kg N ha-1 through urea (T3), 60 kg N (T4), 30 kg N ha-1 + Azolla 1.6 t ha-1 (T5) and 60 kg N ha-1 + Azolla 1.6 t ha-1 (T6) in randomized block design with four replications. The experimental soil was sandy clay loam in texture having pH 5.1, bulk density 1.36 Mg m-3 and organic carbon 17.5 g kg-1. The highest soil pH was observed in T2 and increased significantly in treatments receiving both Azolla and mineral N-fertilizer (T2, T5 and T6) compared to their sole applications (T1, T3 and T4). The exchangeable calcium and magnesium (c mol (p +) kg-1), CEC (c mol (p +) kg-1) and base saturation percentage also showed the same trends and the highest values were observed as 1.92, 7.90 and 24.30 in T2. However, in contrast to this, the lowest values of exchangeable aluminum, exchangeable acidity and acidity saturation percentage were observed in T2 indicating that the sole application of Azolla improved soil acidity indices. The soil available P and K contents were recorded higher in the treatments with Azolla integrated with mineral fertilizer (T2, T5 and T6) as compared to the sole application of urea (T3 and T4) or control (T1) at different crop growth stages and at maturity. Available phosphorus in T6 was statistically significant over T4 whereas T5 was significant over T3 with respect to advancement in crop age. The organic carbon data followed the same trends.

Journal of Air Pollution and Health, 2021

The issue of pollution in urban cities is a major problem these days especially in cities like th... more The issue of pollution in urban cities is a major problem these days especially in cities like the New Delhi is detected with more number of toxic gases in air, which has deduced the air quality of New Delhi. Thus, predictive analytics play a significant role in predicting the future instances of air quality based on the historical data. Forecasting the air quality of these cities is mandatory to overcome its consequences. Several machines learning algorithm is widely used these days to predict the future instances. Such as random forest, support vector machine, regression, classification, and so on. Main pollutants which present in the air are PM2.5, PM10, CO, NO2 , SO2 and O3 . In this paper we have focused mainly on data set of New Delhi for predicting ambient air pollution and quality using several machines learning algorithm.

Proceedings of the 34th ACM/SIGAPP Symposium on Applied Computing, 2019

Proceedings of the 12th Innovations on Software Engineering Conference (formerly known as India Software Engineering Conference), 2019

Smartphone applications are getting more complicated as they compete with their desktop counterpa... more Smartphone applications are getting more complicated as they compete with their desktop counterparts regarding the functionalities they provide. Learning to use these applications can be difficult for old, differently abled, or relatively new users of the smartphones. The customer service associates cannot guide them if they don&#39;t have visibility into users&#39; interactions with their phones at runtime. Software developers need such clarity while debugging the applications to understand what inputs users are providing. In this paper, we present an approach using static analysis and code synthesis to capture the users&#39; interactions with their smartphone applications. We propose a middleware, in terms of a library, to add record and control capabilities to the applications. We implement it as an Android library, which can be integrated in an automated manner with any Android application. While there exist solutions that grant a complete control of the smartphone to a remote person, our solution finds a middle ground as to not violate user&#39;s privacy and yet provide effective remote interactions. Our middleware is generic enough to support Android devices across all dimensions, resolutions and orientations, yet capable enough to support a versatile set of complex GUI gestures while preserving users&#39; privacy. To evaluate our solution for its efficiency in terms of ease of use, resources and user-friendliness, we added it to Plaid, a popular open-source Android application. The results show that our solution changed only 0.34% of the LOC of the original source code. We compare the efficiency of our solution with that of TeamViewer using TeamViewer Remote Control and QuickSupport. As compared to QuickSupport, our solution uses 10 times less RAM, 15 times less network, 3 times less CPU, and less than half power. We evaluate the user experience of our solution by a survey which shows that none of the participants felt the UI interference or lag to be excessive.

Indian Journal of Image Processing and Recognition, 2021

The major part of the underlying idea is going to detect the fire from upcoming smoke and the sha... more The major part of the underlying idea is going to detect the fire from upcoming smoke and the shade color of the smoke using convolutional neural network. The fire detection followed by the smoke detection is going to depend on the shade and the direction vector analysis in this paper. Image processing from the available set of data is very vague ideation so in order to strengthen the idea we are incorporating two main features that is the smoke shade and direction vector. For this major process we will involve data preprocessing through bi-variate hypothesis to select two variables as the color of smoke and the direction of the smoke and hence do the further analysis on other features that how are they going to help in the upcoming detection neurons for the robust algorithm of fire detection.

Chemical Science, 2021

A persulfide/hydrogen sulfide generation strategy through artificial substrates for 3-mercaptopyr... more A persulfide/hydrogen sulfide generation strategy through artificial substrates for 3-mercaptopyruvate sulfurtransferase (3-MST) is reported, which enhances cellular persulfides, attenuates reactive oxygen species (ROS), and alleviates inflammation.

2020 IEEE First International Conference on Smart Technologies for Power, Energy and Control (STPEC), 2020

This paper presents a comparative analysis of modulation schemes implemented on multi-level inver... more This paper presents a comparative analysis of modulation schemes implemented on multi-level inverters (MLIs). A five level three phase Cascaded H-bridge multilevel inverter (CHBMLI) is simulated to compare the performance of various modulation techniques. In this paper, phase disposition pulse width modulation, phase opposition disposition pulse width modulation, alternate phase opposition disposition pulse width modulation, phase shifted pulse width modulation, third harmonic injection pulse width modulation, switching frequency optimal pulse width modulation(SFOPWM) and rotated carrier technique have been simulated and their THD and fundamental line-to-line voltages have been compared. This paper also shows the output voltage and THD improvement in the AC output when the reference modulating signal is injected with the third harmonic.

Journal of Evidence Based Medicine and Healthcare, 2020

International Journal of Innovations in Engineering and Science, 2020

In this study, the performance of fir piles in sand has been evaluated. Under reamed piles are de... more In this study, the performance of fir piles in sand has been evaluated. Under reamed piles are deep in-situ concrete piles with one or more enlargements in their stems. The enlargement is called bulb and increases the strength and stability of these piles. The goal of this study was comparing the performance of fir pile and conventional under reamed piles of the same diameter and length in sand. For this purpose, load test is done and the results were compared. Analysis and calculation results showed that fir piles had better performance than the conventional under reamed piles, and had higher ultimate tensile and compressive bearing capacity and lower displacements. Moreover, under reamed piles had higher ultimate tensile bearing capacity and lower uplift in comparison to conventional piles of the same length and different volume.