Gogineni Krishna Chaitanya and Krovi Raja Sekhar
The existing authentication procedures (pin, pattern, password) are not very secure. Therefore, the Gait pattern authentication scheme is introduced to verify the own user. The…
Abstract
Purpose
The existing authentication procedures (pin, pattern, password) are not very secure. Therefore, the Gait pattern authentication scheme is introduced to verify the own user. The current research proposes a running Gaussian grey wolf boosting (RGGWB) model to recognize the owner.
Design/methodology/approach
The biometrics system plays an important role in smartphones in securing confidential data stored in them. Moreover, the authentication schemes such as passwords and patterns are widely used in smartphones.
Findings
To validate this research model, the unauthenticated user's Gait was trained and tested simultaneously with owner gaits. Furthermore, if the gait matches, the smartphone unlocks automatically; otherwise, it rejects it.
Originality/value
Finally, the effectiveness of the proposed model is proved by attaining better accuracy and less error rate.
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R. Raghavendra Rao and K. Raja Sekhar
This paper aims to study the effects of couple stresses and surface roughness on the minimum film thickness of heavily loaded rollers and to discuss these by following Grubin's…
Abstract
Purpose
This paper aims to study the effects of couple stresses and surface roughness on the minimum film thickness of heavily loaded rollers and to discuss these by following Grubin's approach and Crook's approximations.
Design/methodology/approach
A generalised form of Reynolds equation for rough surfaces with lubricant as couple stress fluid is derived. This equation is then used to study the combined effect of couple stresses and surface roughness on the roller bearings under heavily loaded conditions. EHD minimum film thickness expressions is obtained by following Grubin's approach and Crook's approximation and it is studied numerically.
Findings
It is found that, as the chain length of the additive molecules increases, the elastohydrodynamic minimum film thickness increases. Also, as the mean height of roughness asperities increases, the elastohydrodynamic minimum film thickness increases for the transversal roughness and it decreases in the case of longitudinal roughness.
Research limitations/implications
These effects are studied theoretically by the mathematical equations in heavily loaded roller bearings.
Practical implications
Reduction of the film thickness in the EHD lubrication between the rollers can be compensated by the use of lubricants containing additives of molecules of size. As a result the bearing performance can be improved.
Originality/value
This research paper provides a closed form of the expressions for the bearings in EHD lubrication and is studied with regard to couple stress parameter. This paper helps to manufacture better bearings.
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Said Sobhi, Mohamed El Khlifi and Mohamed Nabhani
The purpose of this study is to present a theoretical investigation of the effects of cavitation and couple stress on the squeeze film behavior between an anisotropic poroelastic…
Abstract
Purpose
The purpose of this study is to present a theoretical investigation of the effects of cavitation and couple stress on the squeeze film behavior between an anisotropic poroelastic rigid disc and a sinusoidally oscillating rigid disc.
Design/methodology/approach
Based on the microcontinuum theory of Vijay Kumar Stokes and the Elrod–Adam algorithm, the non-Newtonian Reynolds equation coupled with modified Darcy's law for lubricant flow through the porous disc is derived. This numerical study includes the continuity of tangential velocity at the porous–fluid interface and the effects of percolation of the polar additives into the anisotropic porous disc.
Findings
The effects of couple stress, oscillating amplitude, percolation additives, permeability and anisotropic permeability on the squeeze film characteristics are discussed. It is found that both the percolation effect of the lubricant additives and the anisotropic structure of the porous surface reduce the flow in the porous disc, resulting in a decrease in pressure. It is also observed that cavitation effects are more pronounced for Newtonian fluids than couple stress fluids.
Originality/value
The results of this study can be used to design a variety of engineering applications such as bearings, wet clutches and non-contact mechanical seals.
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Although managers and academicians have recognised the importance of high-commitment work systems (HCWS), work engagement and psychological capital (PsyCap) in service firms, many…
Abstract
Purpose
Although managers and academicians have recognised the importance of high-commitment work systems (HCWS), work engagement and psychological capital (PsyCap) in service firms, many questions remain unanswered. This study aims to fill the gaps in the area of work engagement by considering the relationships among HCWS, PsyCap and work engagement. In this cross-sectional study, the author drew on the social exchange theory to analyse these relationships.
Design/methodology/approach
Cross-sectional data from 309 employees from India’s services sector was collected to investigate HCWS and work engagement associations. The data were analysed by structural equation modelling.
Findings
The study findings integrate the existing literature on human resource (HR) systems and positive psychology by identifying the critical role of PsyCap in passing the positive effects of HCWS to engage employees in their work. Further, it supports the assumption that PsyCap is formed primarily based on organisational practices, thereby addressing the paucity of research that examined the antecedents of PsyCap.
Practical implications
Owing to study findings, service firms are encouraged to carry out human resource development intervention(s) to make their employees psychologically capable. Since PsyCap is a state-like construct, it can be developed among individuals. Thus, managers can develop their employees’ PsyCap through various training interventions.
Originality/value
The mediating role of PsyCap in the HCWS and work engagement in India’s service industries settings was tested. The present study’s findings contribute to the theory of strategic human resource management by explaining how HCWS can help employees engage better in their work.
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Priyanka Nayak and Pratap Kumar Jena
The purpose of this paper is to investigate how the rising domestic food price inflation in India is influenced by global macroeconomic factors like crude oil, exchange rate…
Abstract
Purpose
The purpose of this paper is to investigate how the rising domestic food price inflation in India is influenced by global macroeconomic factors like crude oil, exchange rate, foreign aid, global food prices and trade openness from January 1993 to December 2022.
Design/methodology/approach
The study has employed the structural break, autoregressive distributed lag cointegration tests to assess the stationarity and long-term relationship between the variables and the Toda–Yamamoto Granger causality test to demonstrate the causal relationship between the variables.
Findings
The study highlights the long-term relationships among variables, shedding light on the influence of global macroeconomic factors on domestic food price inflation in India. It reveals that food price inflation in India is positively influenced by crude oil prices and global food prices while being negatively affected by currency rates, foreign direct investment and trade openness.
Originality/value
Based on the findings, the study suggests that initiatives to reduce demand for crude oil and imported food products could help mitigate domestic food price inflation in India. Addressing the depreciation of the exchange rate is crucial to combat significant inflation in domestic food prices, calling for specific government interventions. Furthermore, promoting trade liberalization and foreign direct investment in the agricultural sector could help alleviate domestic food price inflation, emphasizing the importance of reducing customary trade barriers to encourage investment and trade openness.
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This paper aims to clarify some aspects of the application of the Godunov method for the Baer–Nunziato equations solution on the example of the problem of shock wave – dense…
Abstract
Purpose
This paper aims to clarify some aspects of the application of the Godunov method for the Baer–Nunziato equations solution on the example of the problem of shock wave – dense particles cloud interaction.
Design/methodology/approach
The statement of the problem corresponds to the natural experiment. Mathematical model is based on the Baer–Nunziato system of equations with algebraic right-hand side source terms that takes into account the interphase friction force. Two numerical approaches are used: Harten-Lax-van Leer method and Godunov method.
Findings
For the robust simulation using Godunov method, the application of the pressure relaxation procedure is proposed. The comparative analysis of the simulation results using two methods is carried out. The Godunov method provides significantly smaller numerical diffusion of the solid phase volume fraction in the cloud that leads to the much better agreement of the pressure curves on transducers and the dynamics of the cloud motion with the experimental data.
Originality/value
Godunov method for the Baer–Nunziato equations is applied for the simulation of the natural experiment on the shock wave particles cloud interaction. Up to now, the examples of the application of the Godunov method for the Baer–Nunziato equations to the investigation of the practical problems have been limited by the works of the authors of the method and the field of detonation in the heterogeneous explosives. For the robust simulations in the presence of interphase boundaries, it is proposed to use the Godunov method together with the pressure relaxation procedure.