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Islam J.,IIT RoorkeeUttarakhand | Rahman Z.,IIT RoorkeeUttarakhand
Telematics and Informatics | Year: 2017

The advent of interactive digital platforms has led people to progressively interact on such platforms, urging organizations to create online communities to engage customers with them and with each other to enhance brand loyalty. This study attempts to investigate what motivates customers to engage in these brand communities. Through a questionnaire survey of 430 Facebook users, this study investigates whether and how the unique characteristics (information quality, system quality, virtual interactivity, and rewards) of online brand communities affect customer engagement. The consequent effect of customer engagement on brand loyalty is also examined. This study frames and empirically validates a model for engaging customers with online brand communities on Facebook, considering the moderating role of gender. The Stimulus-Organism-Response paradigm is solicited to justify the theoretical background of this study. The data were analyzed using structure equation modelling. Results reveal that each of the characteristics positively influences customer engagement, with information quality and virtual interactivity bearing the strongest influence. Customer engagement also exhibits a strong positive impact on brand loyalty. This results further reveal that gender gap in the online environment is declining as the impact of all the four characteristics of online brand communities on customer engagement was invariable across male and female members. © 2017 Elsevier Ltd


Katiyar R.S.,IIT RoorkeeUttarakhand | Jha P.K.,IIT RoorkeeUttarakhand
Polymer (United Kingdom) | Year: 2017

We have performed fully atomistic molecular dynamics simulations of aqueous solutions of a weak, pH-responsive polyelectrolyte, polyacrylic acid (PAA). Model oligomers of PAA of different tacticities, molecular weights, degrees of deprotonation, and deprotonation patterns are simulated with water molecules. Deprotonation of PAA chains that occurs with an increase in pH results in an increase in Coulomb repulsion between chain segments on one hand, and a non-monotonic change in the hydrogen bonding between chain segments on the other hand. Consequently, at the single chain level, PAA chains are stretched at higher pH values, where the amount of stretching varies with chain tacticity. For the multiple chains case, PAA forms aggregates at higher concentrations, which are relatively denser and contain lesser water (solid-like) at lower pH than compared to higher pH (liquid-like). Such phase transitions of PAA aggregates with pH has possible implications in the design of pH-responsive polyelectrolytes for applications in drug delivery. © 2017 Elsevier Ltd


Akkera H.S.,Functionalnanomaterials Research Laboratory | Singh I.,IIT RoorkeeUttarakhand | Kaur D.,Functionalnanomaterials Research Laboratory
Journal of Magnetism and Magnetic Materials | Year: 2017

The influence of Cr substitution for In on the martensitic phase transformation and magnetocaloric effect (MCE) has been investigated in Ni-Mn-Cr-In ferromagnetic shape memory alloy (FSMA) thin films fabricated by magnetron sputtering. Temperature dependent magnetization (M-T) measurements demonstrated that the martensitic transformation temperatures (TM) monotonously increase with the increase of Cr content due to change in valence electron concentration (e/a) and cell volume. From the study of isothermal magnetization curves (M-H), magnetocaloric effect around the martensitic transformation has been investigated in these FSMA thin films. The magnetic entropy change ∆SM of 7.0 mJ/cm3-K was observed in Ni51.1Mn34.9In9.5Cr4.5 film at 302 K in an applied field of 2 T. Further, the refrigerant capacity (RC) was also calculated for all the films in an applied field of 2 T. These findings indicate that the Cr doped Ni-Mn-In FSMA thin films are potential candidates for room temperature micro-length-scale magnetic refrigeration applications. © 2016 Elsevier B.V.


Swain S.,IIT RoorkeeUttarakhand | Niyogi R.,IIT RoorkeeUttarakhand
ACM International Conference Proceeding Series | Year: 2017

Due to the proliferate use of mobile devices, the Internet is now easily accessible and such ubiquitousness helps users by offering services anytime, anywhere. Typically, a complex user request is satisfied by composing several services. In pervasive systems the set of services may change as the context changes. In this paper, we model context-aware services composition problem as a planning problem. Some salient aspects of our approach are: (i) a user gives request in her native language, which is then compiled to a planning domain description language (PDDL) and (ii) the environment is monitored and a plan is generated according to the situation. We have implemented a context-aware education system to illustrate our approach. © 2017 ACM.


Deshpande P.,IIT RoorkeeUttarakhand | Sharma S.C.,IIT RoorkeeUttarakhand | Kumar P.S.,IIT RoorkeeUttarakhand
International Conference on Computing, Communication and Automation, ICCCA 2015 | Year: 2015

This paper reports a detailed analysis and categorization of various security threats in a cloud computing environment along with a brief taxonomy of intrusion detection system. The security attacks are launched on a private cloud and the detection and prevention are carriedout by using SNORT IDS. A portscan and TCP Flood attack are used for the analysis purpose. © 2015 IEEE.


Saini D.,IIT RoorkeeUttarakhand | Kaushik B.K.,IIT RoorkeeUttarakhand
RAECE 2015 - Conference Proceedings, National Conference on Recent Advances in Electronics and Computer Engineering | Year: 2015

Owing to the benefits of organic electronics, flexible, large area and low cost circuits can be easily implemented, however, these circuits are marred by low performance. The performance improvement of the organic devices requires serious efforts to make them practically viable. Dual gate transistors can be one of the solutions for improving the performance. This research paper focuses towards the performance analysis of Pentacene based unipolar dual gate organic thin film transistor (DG-OTFT). Encouragingly, the DG-OTFT enhances the mobility by 30% and the Ion/Ioff ratio by more than six times in comparison to the single gate OTFT. An inverter and a ring oscillator based on DG-OTFT are analyzed that demonstrate significantly improved performance. The operational frequency of 2.3 KHz is achieved for the unipolar ring oscillator using DG-OTFT. © 2015 IEEE.


Sharma S.K.,Center for Transportation Systems | Kumar A.,IIT RoorkeeUttarakhand
Procedia Engineering | Year: 2016

A rail wheel contact mechanism has been a keen interest area for railway engineers. The present study focuses on the influence of interacting wheel and rail profile topology. A standard rail UIC 60 and standard wheel profile, as per the standards of Indian railways, were taken for different rail profile radii, wheel profile radii and wheel profile tapers. The mathematical and numerical studies were done by using Quasi-Hertz and FE analysis to analyze the impact of the interacting wheel and rail profiles on the distribution of contact zones and stresses. Moreover, the effect of contact forces and contact stresses on the deformation of rolling wheels and rails were also evaluated. The effect of lateral movement in the evaluation of frictional forces was found using Kalker theory. © 2016 The Authors.


Satyanarayana D.V.V.,Defence Metallurgical Research Laboratory | Prakash U.,IIT RoorkeeUttarakhand | Khaple S.,Defence Metallurgical Research Laboratory | Baligidad R.G.,Defence Metallurgical Research Laboratory | Prasad V.V.S.,Defence Metallurgical Research Laboratory
Materials at High Temperatures | Year: 2014

Tensile creep of a Fe-16 wt-%Al-0·5 wt-%C alloy was investigated over a temperature range of 773 to 873 K and stress range of 80 to 200 MPa. Creep curves exhibited very limited primary and secondary creep regimes. An extended tertiary creep regime was observed for all the test conditions. Stress dependence of minimum creep rate can be represented by a power-law equation with stress exponents being in the range 4 to 5. The activation energy for creep was found to be ∼340 kJ mol-1. The observed stress exponent and activation energy for creep suggest that creep is controlled by dislocation climb. Creep fracture in Fe3Al-C alloy is predominantly by transgranular ductile mode by nucleation, growth and coalescence of microvoids formed at FeAlC0·5 particle/matrix interface by decohesion as well as fracture of elongated particles. Extended tertiary creep observed in the alloy was analysed in the light of the mechanisms proposed for nickel based superalloys. © W. S. Maney & Son Ltd. 2014.


Pare S.,Indian Institute of Information Technology, Design and Manufacturing | Kumar A.,Indian Institute of Information Technology, Design and Manufacturing | Bajaj V.,Indian Institute of Information Technology, Design and Manufacturing | Singh G.K.,IIT RoorkeeUttarakhand
Applied Soft Computing Journal | Year: 2016

Amongst all the multilevel thresholding techniques, standard histogram based thresholding approaches are very impressive for bi-level thresholding. But, it is not effective to select spatial contextual information of the image for choosing optimal thresholds. In this paper, a new color image thresholding technique is presented by using an energy function to generate the energy curve of an image by considering spatial contextual information of the image. The property of this energy curve is very much similar to histogram of the image. To estimate the spatial contextual information for thresholding practice, in place of histogram, the energy curve function is used as an input. A new energy curve based color image segmentation approach using three well known objective functions named Kapur's entropy, between-class-variance, and Tsalli's entropy is proposed. In this paper, cuckoo search (CS) and egg lying radius-cuckoo search (ELR-CS) optimization algorithms with different parameter analysis have been used for solving the color image multilevel thresholding problem. The experimental results demonstrate that the proposed CS-Kapur's energy curve based segmentation can powerfully and accurately search the multilevel thresholds. © 2016 Elsevier B.V.


Aparna K.P.,IIT RoorkeeUttarakhand | Jain A.K.,IIT RoorkeeUttarakhand
Indian Concrete Journal | Year: 2016

Performance evaluation of a multistoreyed building subjected to seismic loading involves estimating its ductility capacity and ductility demand and correlating with the damage levels. Nonlinear analysis, both static (Pushover) and dynamic (Time history), are used in the present study for evaluating the performance of a 10 storey RC frame. The extent of damage is quantified by evaluating the ductility demand imposed on the building by the site specific earthquake response spectra as well as the El Centro accelerogram of May 1940. The results show that the static pushover analysis methods give results close to those obtained by nonlinear dynamic analysis for the frame considered in the present work. The significance of providing ductile detailing based on IS 456 and IS 13920 codes to meet the demand ductility of frames in seismic zone V and II was evaluated through material quantity estimation against ordinarily designed frames confirming to IS 456 specifications.

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