Data Protection in Clouds using Two Stage Encryption

Pallav Sharma,Varsha Sharma,Sanjeev Sharma,Jitendra Agrawal 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.4

Cloud Computing has been an emergent technology that has opened the space for virtualization, as it provides many computational services and storage services over the Internet with the help of a browser. Cloud computing’s core comprises of services like platform, infrastructure and software as a service. The unpredicted boom in cloud computing is driven by its simple economic benefit. It helps in reducing capital expenses and minimizes operating expenses. This move however, has increased a major concern about the protection of data, as against the traditional system the data is now stored online and is far easily exposed than we realize. This raises a major security issue for data protection. Many techniques for protection of data have been proposed so far. However, the best available option till date is to encrypt user data before storing it over the cloud environment and decrypting it again before handing the data back to the cloud user. In this paper, we introduce a more efficient and stronger encryption process that allows a cloud service provider to protect user data more efficiently.

Viscosity of the oil-in-water Pickering emulsion stabilized by surfactant-polymer and nanoparticle-surfactant-polymer system

Tushar Sharma,G. Suresh Kumara,전보현,Jitendra S. Sangwai 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.4

Information on the viscosity of Pickering emulsion is required for their successful application in upstreamoil and gas industry to understand their stability at extreme environment. In this work, a novel formulationof oil-in-water (o/w) Pickering emulsion stabilized using nanoparticle-surfactant-polymer (polyacrylamide)system as formulated in our earlier work (Sharma et al., Journal of Industrial and Engineering Chemistry,2014) is investigated for rheological stability at high pressure and high temperature (HPHT) conditionsusing a controlled-strain rheometer. The nanoparticle (SiO2 and clay) concentration is varied from 1.0 to 5.0wt%. The results are compared with the rheological behavior of simple o/w emulsion stabilized by surfactant-polymer system. Both the emulsions exhibit non-Newtonian shear thinning behavior. A positive shiftin this behavior is observed for surfactant-polymer stabilized emulsion at high pressure conditions. Yieldstress is observed to increase with pressure for surfactant-polymer emulsion. In addition, increase in temperaturehas an adverse effect on the viscosity of emulsion stabilized by surfactant-polymer system. In caseof nanoparticle-surfactant-polymer stabilized o/w emulsion system, the viscosity and yield stress are predominantlyconstant for varying pressure and temperature conditions. The viscosity data for both o/w emulsionsystems are fitted by the Herschel-Bulkley model and found to be satisfactory. In general, the studyindicates that the Pickering emulsion stabilized by nanoparticle-surfactant-polymer system shows improvedand stable rheological properties as compared to conventional emulsion stabilized by surfactant-polymersystem indicating their successful application for HPHT environment in upstream oil and gas industry.

Concentration Dependent Optical Properties of Rhodamine B Doped Poly(vinyl alcohol) Solutions

Jitendra Tripathi,Anupam Sharma,Shilpa Tripathi,Kallol Kumar Das 한국고분자학회 2016 Macromolecular Research Vol.24 No.7

The optical properties, namely refractive index (RI) studies, are reported on a series of pure and doped poly(vinyl alcohol) (PVA) in solution form. The PVA solutions were synthesized with 1, 2, 3, 4, and 5 wt% of PVA in distilled water followed by doping with Rhodamine B in concentrations ranging from 0.05 wt% to 2 wt%. The absorption spectra show an observable shift in the band edge position towards higher wavelength with increase in PVA wt%. When the dopant molecules are added, the curves are drastically modified with the occurrence of new peaks arising at higher doping concentrations along with change in the bandgap. These effects are prominent for all the concentration of PVA solution. The RI does not change much for low doping wt%. but when dopant is added in higher concentrations, it increases slightly reaching a maximum of ~1.35 at 2 wt%. It is observed that host polymer properties dominate at low doping while a combination of host polymer and dopant dye properties dominate at higher doping concentrations.

Review : Ad-Hoc Cloud Architecture & Modern Cryptography

Jitendra Singh Sengar,Richa Sharma 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.6

This paper is showing the review study on cloud architecture that uses donation based resources in a network & helps multiple organizations to collaborate and yet compete with each other. The resources are utilized non intrusively. Organizations collaborate to create a Data-centre, that doesn’t harm their existence or profitability. At the same time, these organizations can compete by spreading to those locations where they carry certain edge over theirs. An ad-hoc cloud in heterogeneous environment helps to venture into remote areas. To achieve this some, ad-hoc cloud architecture is proposed along with issues and strategies. This is being elaborated in this paper with some effective sense.

Comparative analysis of VMT genes/proteins in selected plant species with emphasis on bread wheat (Triticum aestivum L.)

Sharma Hemant,Shayaba,Kumar Rahul,Kumar Jitendra,Bhadana Deepa,Batra Ritu,Singh Rakhi,Kumar Sachin,Roy Joy K,Balyan Harindra S.,Gupta Pushpendra K. 한국유전학회 2023 Genes & Genomics Vol.45 No.11

Background In recent years, the study of molecular basis of uptake, transport and utilization of grain Fe/Zn (GFe/GZn) in wheat has been an active area of research. As a result, it has been shown that a number of transporters are involved in uptake and transport of Fe. In a recent study, knockout of a transporter gene OsVMT (VACUOLAR MUGINEIC ACID TRANSPORTER) in rice was shown to be involved in Fe homoeostasis. Objective In this study, we analysed VMT genes among six monocots and three dicots with major emphasis on wheat VMT genes (TaVMTs), taking OsVMT gene as a reference. Methods and results Using OsVMT gene as a reference, VMT genes were identified and sequence similarities were examined among six monocots and three dicots. Each VMT protein carried one functional domain and 7 to 10 distinct motifs (including 9 novel motifs). The qRT-PCR analysis showed differential expression by all the six TaVMT genes in pairs of contrasting wheat genotypes with high (FAR4 and WB02) and low (K8027 and HD3226) GFe/GZn at two different grain filling stages (14 DAA and 28 DAA). TaVMT1 genes showed up-regulation in high GFe/Zn genotypes relative to low GFe/Zn genotypes, whereas the TaVMT2 genes showed down-regulation or nonsignificant up-regulation in a few cases. Conclusions At 14 DAA, each of the six TaVMT genes exhibited higher expression in wheat genotypes with high GFe and GZn relative to those with low GFe and GZn, suggesting major role of VMT genes in improvement of grain Fe/Zn homoeostasis, thus making TaVMT genes useful for improvement in Fe/Zn in wheat grains.

A Review of Mobile Robots: Applications and Future Prospect

Nitin Sharma,Jitendra Kumar Pandey,Surajit Mondal 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.9

Approximately eight decades ago, during World War II, the concept of intelligent robots capable of independent arm movement began to emerge as computer science and electronics merged with advancements in mechanical engineering. This marked the starting point of a thriving industry focused on research and development in mobile robotics. In recent years, there has been a growing association between robotics and artificial intelligence, aiming to enable robots to make autonomous decisions akin to human cognition. To achieve this objective, researchers are actively exploring the integration of artificial neural networks with mechatronic robots. These intelligent and self-decision-making robots possess the potential to revolutionize human capabilities and elevate our intelligence to unprecedented levels. In various physical service sectors such as cleaning, security, and other tasks that don't require creative or analytical thinking, these robots can efficiently carry out the assigned responsibilities. Moreover, robots have the potential to play a significant role in military operations, eliminating the need for human lives to be sacrificed in warfare. This review article aims to explore the advancements in mobile robotics since their inception nearly 80 years ago. It will delve into the detailed applications of these robots across different sectors and discuss their profound effects on contemporary human lives and industrial landscapes.

Mechanistic insights into the interaction between energetic oxygen ions and nanosized ZnFe₂O₄: XAS-XMCD investigations

Singh, Jitendra Pal,Kaur, Baljeet,Sharma, Aditya,Kim, So Hee,Gautam, Sanjeev,Srivastava, Ramesh Chandra,Goyal, Navdeep,Lim, Weol Cheol,Lin, H.-J.,Chen, J. M.,Asokan, K.,Kanjilal, D.,Won, Sung Ok,Lee, The Royal Society of Chemistry 2018 Physical Chemistry Chemical Physics Vol.20 No.17

<P>The interactions of energetic ions with multi-cation compounds and their consequences in terms of changes in the local electronic structure, which may facilitate intriguing hybridization between O 2p and metal d orbitals and magnetic ordering, are the subject of debate and require a deep understanding of energy transfer processes and magnetic exchange mechanisms. In this study, nanocrystals of ZnFe2O4 were exposed to O<SUP>7+</SUP> ions with an energy of 100 MeV to understand, qualitatively and quantitatively, the metal-ligand field interactions, cation migration and magnetic exchange interactions by employing X-ray absorption fine structure measurements and X-ray magnetic circular dichroism to get deeper mechanistic insights. Nanosized zinc ferrite nanoparticles (NPs) with a size of ∼16 nm synthesized in the cubic spinel phase exhibited deterioration of the crystalline phase when 100 MeV O<SUP>7+</SUP> ions passed through them. However, the size of these NPs remained almost the same. The behaviour of crystal deterioration is associated with the confinement of heat in this interaction. The energy confined inside the nanoparticles promotes cation redistribution as well as the modification of the local electronic structure. Prior to this interaction, almost 42% of Zn<SUP>2+</SUP> ions occupied AO4 tetrahedra; however, this value increased to 63% after the interaction. An inverse effect was observed for metal ion occupancies in BO6 octahedra. The L-edge spectra of Fe and Zn reveal that the spin and valence states of the metal ions were not affected by this interaction. This effect is also supported by K-edge measurements for Fe and Zn. The t2g/eg intensity ratio in the O K-edge spectra decreased after this interaction, which is associated with detachment of Zn<SUP>2+</SUP> ions from the lattice. The extent of hybridization, as estimated from the ratio of the post-edge to the pre-edge region of the O K-edge spectra, decreased after this interaction. The metal-oxygen and metal-metal bond lengths were modified as a result of this interaction, as determined from extended X-ray absorption fine structure measurements. These measurements further support the observation of cation migration from AO4 tetrahedra to AO6 octahedra and <I>vice versa</I>. The Fe L-edge magnetic circular dichroism spectra indicate that Fe<SUP>3+</SUP> ions occupying sites in AO4 tetrahedra and BO6 octahedra exhibited antiferromagnetic-like ordering prior to this interaction. The NPs that interacted with energetic O ions displayed a different kind of magnetic ordering.</P>

Thermal stability of oil-in-water Pickering emulsion in the presence of nanoparticle, surfactant, and polymer

Tushar Sharma,G. Suresh Kumara,전보현,Jitendra S. Sangwai 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-

Pickering emulsion offers potential applications in several fields including oil and gas industry due totheir enhanced stability. Oil-in-water (o/w) emulsions are usually stabilized by surfactant ornanoparticle or by both but show poor thermal stability which limits their use for high-temperatureapplications. In this work, a novel formulation of o/w emulsion stabilized using nanoparticle-surfactantpolymersystem is investigated for the formulation of thermally stable Pickering emulsion. Theconventional oilfield polymer polyacrylamide (PAM), surfactant, sodium dodecylsulfate (SDS), andnanoparticles such as, SiO2, clay, and CuO in varying concentration are used. It is observed that thenanoparticle in the presence of surfactant and polymer synergistically interacted at the oil–waterinterface. The effect of temperature, pH, and salinity on the interfacial tension is investigated tounderstand the thermal stability. The emulsion system with partially hydrophobic clay nanoparticles inthe presence of PAM and SDS shows higher thermal stability as compared to fully hydrophilic SiO2nanoparticles. In the presence of salt, NaCl (1.0 wt%), the thermal stability of clay and SiO2 stabilizedemulsions is observed to be further promoted at higher temperatures. Scanning electron microscopy(SEM) images confirm the existence of a structured and rigid layer of nanoparticle at the oil–waterinterface.

Character based ASCII Encryption & Decryption on Cloud System

Richa Sharma,K. K. Parashar,Jitendra Singh Sengar 보안공학연구지원센터 2016 International Journal of Database Theory and Appli Vol.9 No.5

This paper proposed a algorithm for automatic key generation which generate from an integer value to create more secure communication over cloud architecture. Character based ASCII encryption scheme is used to satisfy the current requirement to establish secure communication. In this work we have a byte level security at each level of data transmission. It helps to create batter security to perform encryption & decryption over cloud infrastructure i.e., from this work we have technique through which we generate private key which help to establish secure communication between two or more node while they are communicating over cloud system.

3D Printing: It’s Microfluidic Functions and Environmental Impacts

Abhishek Sharma,Jitendra K. Pandey,Surajit Mondal,Amit Kumar Mondal,Soumadeep Baksi,Ravi Kumar Patel,추원식 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.4 No.3

Innovative micro products essential for the utilization of a wide variety of macro subjects have complicated three-dimensional (3D) microstructures in addition to a high aspect ratio. Till date, many micro manufacturing processes have been developed, but a specific class of such processes is applicable for fabrication of true 3D micro assembly. The aptitude to process a broad range of materials and the ability to fabricate functional and geometrically complicated, 3D microstructures provides the additive manufacturing (AM) processes which significant profits over traditional methods, such as lithography-based or micromachining approaches investigated widely in the past. In this paper, 3D micro-AM processes have been classified into three main groups, including scalable micro-AM systems, 3D direct writing, and hybrid processes, and the key processes have been reviewed comprehensively. Principle and recent progress of each 3D micro-AM process have been described, and the advantages and disadvantages of each process have low-cost along with its occupational health safety & environmental issues.