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Safety Management Practices in Small and Medium Enterprises in India
Unnikrishnan, Seema,Iqbal, Rauf,Singh, Anju,Nimkar, Indrayani M. Occupational Safety and Health Research Institute 2015 Safety and health at work Vol.6 No.1
Background: Small and medium enterprises (SMEs) are often the main pillar of an economy. Minor accidents, ergonomics problems, old and outdated machinery, and lack of awareness have created a need for implementation of safety practices in SMEs. Implementation of healthy working conditions creates positive impacts on economic and social development. Methods: In this study, a questionnaire was developed and administered to 30 randomly chosen SMEs in and around Mumbai, Maharashtra, and other states in India to evaluate safety practices implemented in their facilities. The study also looked into the barriers and drivers for technology innovation and suggestions were also received from the respondent SMEs for best practices on safety issues. Results: In some SMEs, risks associated with safety issues were increased whereas risks were decreased in others. Safety management practices are inadequate in most SMEs. Market competitiveness, better efficiency, less risk, and stringent laws were found to be most significant drivers; and financial constraints, lack of awareness, resistance to change, and lack of training for employees were found to be main barriers. Conclusion: Competition between SMEs was found to be major reason for implementation of safety practices in the SMEs. The major contribution of the study has been awareness building on safety issues in the SMEs that participated in the project.
Thermal characteristics of defective carbon nanotube-polymer nanocomposites
Unnikrishnan, V.U.,Reddy, J.N.,Banerjee, D.,Rostam-Abadi, F. Techno-Press 2008 Interaction and multiscale mechanics Vol.1 No.4
The interfacial thermal resistance of pristine and defective carbon nanotubes (CNTs) embedded in low-density polyethylene matrix is studied in this paper. Interface thermal resistance in nanosystems is one of the most important factors that lead to the large variation in thermal conductivities in literature and the novelty of this paper lies in the estimation of the interfacial thermal resistance for defective nanotubes-systems. Thermal properties of CNT nanostructures are estimated using molecular dynamics (MD) simulations and the simulations were carried out for various temperatures by rescaling the velocities of carbon atoms in the nanotube. This paper also deals with the mesoscale thermal conductivities of composite systems, using effective medium theories by considering the size effect in the form of interfacial thermal resistance and also using the conventional micromechanical methods like Hashin-Shtrikman bounds and Wakashima-Tsukamoto estimates.
Reversed percentile residual life and related concepts
N. Unnikrishnan Nair,,B. Vineshkumar 한국통계학회 2011 Journal of the Korean Statistical Society Vol.40 No.1
In this work we discuss the properties of the reversed percentile residual life function and its relationship with the reversed hazard function. Some models with simple functional forms for both reversed hazard rate and reversed percentile residual life function are proposed. A method of distinguishing decreasing (increasing) reversed hazard rates (reversed percentile lives) is also presented.
Safety Management Practices in Small and Medium Enterprises in India
Seema Unnikrishnan,Rauf Iqbal,Anju Singh,Indrayani M. Nimkar 한국산업안전보건공단 산업안전보건연구원 2015 Safety and health at work Vol.6 No.1
Background: Small and medium enterprises (SMEs) are often the main pillar of an economy. Minor accidents,ergonomics problems, old and outdated machinery, and lack of awareness have created a needfor implementation of safety practices in SMEs. Implementation of healthy working conditions createspositive impacts on economic and social development. Methods: In this study, a questionnaire was developed and administered to 30 randomly chosen SMEs inand around Mumbai, Maharashtra, and other states in India to evaluate safety practices implemented intheir facilities. The study also looked into the barriers and drivers for technology innovation and suggestionswere also received from the respondent SMEs for best practices on safety issues. Results: In some SMEs, risks associated with safety issues were increased whereas risks were decreasedin others. Safety management practices are inadequate in most SMEs. Market competitiveness, betterefficiency, less risk, and stringent laws were found to be most significant drivers; and financial constraints,lack of awareness, resistance to change, and lack of training for employees were found to bemain barriers. Conclusion: Competition between SMEs was found to be major reason for implementation of safetypractices in the SMEs. The major contribution of the study has been awareness building on safety issuesin the SMEs that participated in the project.
Characterization of Some Multivariate Distributions
Nair, N.Unnikrishnan The Korean Statistical Society 1989 Journal of the Korean Statistical Society Vol.18 No.1
In this article the problem of characterizing multivariate distributions, possessing certain conditional distributions that have the same form as the parent model, are considered. It is shown that the forms of such conditional distributions characterize some well known distributions like the multivariate exponential, multivariate Burr, multivariate Lomax etc.
Characterization of Some Continuous Distributionsby Properties of Partial Moments
B. Abraham,N. Unnikrishnan Nair,P. G. Sankaran 한국통계학회 2007 Journal of the Korean Statistical Society Vol.36 No.3
In this paper we present characterizations of the Pareto, Lomax, expo-nential and beta models by some properties of theirrth partial momentdened as r(t) = E[(X t)+ ]r, where (X t)+ = max(X t;0). Giventhe partial moments at a few truncation points, these results enable us tocalculate the moments at many other points.
Quantile based reliability aspects of partial moments
P. G. Sankaran,N. Unnikrishnan Nair,S.M. Sunoj 한국통계학회 2013 Journal of the Korean Statistical Society Vol.42 No.3
Partial moments are extensively used in literature for modeling and analysis of lifetime data. In this paper, we study properties of partial moments using quantile functions. The quantile based measure determines the underlying distribution uniquely. We then characterize certain lifetime quantile function models. The proposed measure provides alternate definitions for ageing criteria. Finally, we explore the utility of the measure to compare the characteristics of two lifetime distributions.
Nanomaterial Enhanced Polyelectrolyte Membranes for Hydrogen-Oxygen Fuel Cells
Abdul Kalam Azad,Lakshmi Unnikrishnan,Smita Mohanty,Sanjay Kumar Nayak 한국고분자학회 2021 폴리머 Vol.45 No.1
The solid electrolyte membrane for a hydrogen-oxygen fuel cell was prepared and investigated from the potential of sulfonated poly(ether ether ketone) (SPEEK) embedded together with montmorillonite (MMT). Acid hydrophilized poly(ether ether ketone) (PEEK) and MMT with varying sulfonation levels of 25-70% prepared through solvent casting were investigated for their performance. The nuclear magnetic resonance (1H NMR) spectra at 7.5 ppm affirmed the occurrence of sulfonation reaction, and its degree was studied by both 1H NMR and titration method. The reaction time was varied to achieve sulfonation levels from 25 to 70%. The effect of incorporation of pristine and sulfonated MMT into SPEEK was examined. The membranes, prepared using solvent casting technique, were involved for water uptake over the wide range of temperature, thermal stability, and proton conductivity measurements. The cross-sectional surface arrangement of the membrane and clay dispersion was deliberated using SEM. The proton exchange membrane fuel cell (PEMFC) single cell’s tests revealed that sulfonated PEEK membrane demonstrated service performance comparable to that of Nafion, as validated using MATLAB software.
Algorithm for Vertical Handover Decision using Least Cost Function
Siddharth Goutam,Srija Unnikrishnan,Sundary S. Prabavathy,Archana Karandikar 대한전자공학회 2021 IEIE Transactions on Smart Processing & Computing Vol.10 No.1
Next Generation Networks (NGNs) will be heterogeneous due to the presence of the various Radio Access Technologies (RATs). The number of smartphone users is increasing exponentially, and smartphones are being equipped with multiple network interfaces. Smartphone users desire to be connected to the best network among the available networks while moving across geography. The requirement of seamless connectivity along with a maintained Quality of Service (QoS) can be achieved through Vertical Handover (VHO).Vertical Handover is an important factor to be considered in network design. The full potential of various access networks can be achieved using efficient and effective Vertical Handover Decision Algorithms (VHDAs). In this context, the research paper proposes a model for VHDA based on a Least Cost function. The primary function of VHDA is to provide “All-Time Connectivity to the Best Possible Network with the Best Quality of Service at the Least Cost”. The main parameters considered in the VHDA are RSS, bandwidth, network coverage, packet loss, jitter, and latency.