Wyniki wyszukiwania - BazTech

1

Distributed situation awareness in a demanding maritime operation: a case study of the subsea segment

Norstein E., Sharma A., Jungefeldt S., Nazir S.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2019

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Vol. 13. no. 4

811--822

EN

Maritime subsea operations have increased significantly in size and complexity during the last decades as a result of the advances in the offshore oil industry. Despite the fact that subsea operations can involve hundreds of personnel, working together with complex technology, limited research can be found regarding the operations in the available literature. This study aims to analyze a routine subsea operation using the Distributed Situation Awareness (DSA) framework and understand how the operators on board maintain their DSA in routine operations through a case study. In order to understand how the operation unfold in complex sociotechnical systems and how situational awareness (SA) is distributed across agents and artefacts, the theoretical framework of DSA can be useful as the focus is on the interactions at a systemic level. To achieve the research objectives, a combination of qualitative methods was utilized to illustrate DSA on board a subsea vessel. Initially an observation was conducted during a live subsea survey operation to capture the interaction between personnel and instruments. Furthermore, all observed personnel were subjected to retrospective interviews to elicit further knowledge of the operation. Finally, the data was analyzed according to the propositional network approach and Hierarchical Task Analysis (HTA). The result of this study portrays the SA of a subsea survey operation as propositional networks for the main phases identified in the HTA. The main findings of the study show a significantly difference in DSA among the Bridge personnel and personnel located in the Online Control Room (ONCR). Furthermore, it was found that the dynamic of the system allowed personnel to have different level of DSA without jeopardizing the overall operation. Finally, the summary of the findings provides a basic understanding of how a routine subsea survey operation unfolds.

2

An empirical study on the influences of management’s attitudes toward employees with disabilities in the hospitality sector

Sharma A., Zsarnoczky M., Dunay A.

Polish Journal of Management Studies

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2018

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Vol. 18, No. 2

311--323

EN

Internationally, the participation of people with disabilities (irrespective of the type and severity of disability) in the labour market is on the rise. Within the Hungarian context, research on employment of people with disabilities is limited. The objective of this study was to ascertain the attitudes of employers towards employees with disabilities in the hospitality industry. The sample consisted of 174 participants from the city of Budapest, Hungary and quantitative methods were used to analyse the data. Factor analysis was used to evaluate the factorial structure for this study that yielded six meaningful factors, and ANOVA, Sample t- test and Independent t-test were used to examine the relationship between attitudes of personnel with business and employers’ demographics. This study yielded important results regarding the attitudes of employers toward the employees with disabilities in Hungary. One of the major findings of this study was that the employers displayed neutral responses toward employees with disabilities at the place of work. Managerial implications, limitations and recommendations for future studies are further discussed.

PL

Na arenie międzynarodowej wzrasta udział osób niepełnosprawnych (niezależnie od rodzaju i stopnia niepełnosprawności) na rynku pracy. W kontekście węgierskim, badania dotyczące zatrudnienia osób niepełnosprawnych są ograniczone. Celem tej pracy było zbadanie postaw pracodawców wobec pracowników niepełnosprawnych w branży hotelarsko-gastronomicznej. Próba składała się z 174 uczestników z Budapesztu na Węgrzech, a do analizy danych wykorzystano metody ilościowe. Analizę czynnikową wykorzystano do oceny struktury czynnikowej dla tego badania, która dostarczyła sześciu znaczących czynników, a ANOVA, próbny test t-Studenta i niezależny t-test posłużyły do zbadania zależności między postawami personelu a biznesem i demografią pracodawców. Badanie to przyniosło ważne wyniki dotyczące postaw pracodawców wobec pracowników niepełnosprawnych na Węgrzech. Jednym z głównych wyników tego badania było to, że pracodawcy wykazywali neutralną reakcję na pracowników niepełnosprawnych w miejscu pracy. Poniżej omówiono implikacje dotyczące zarządzania, ograniczenia i zalecenia dotyczące przyszłych badań.

3

Vibration of skew plate with circular variation in thickness and Poisson’s ratio

Sharma A.

Mechanics and Mechanical Engineering

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2018

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Vol. 22, nr 1

49--58

EN

The present study analyzes the natural vibration of non homogeneous visco elastic skew plate (parallelogram plate) with non uniform thickness under temperature field. Here non homogeneity in the plate's material arises due to circular variation in Poisson's ratio. Also the circular variation in thickness causes non uniformity in the shape of the plate. Bi linear temperature variation on the plate along both the axes is being viewed. The equation of motion related to frequency modes are solved by Rayleigh Ritz method. The findings of the present analysis are presented with the help of tables.

4

Propagation of torsional surface waves in a nonhomogeneous half-space with circular irregularity in free surface

Sethi M., Sharma A. K., Sharma A.

International Journal of Applied Mechanics and Engineering

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2018

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Vol. 23, no. 4

929--939

EN

The present paper studies the effect of circular regularity on propagation of torsional surface waves in an elastic non-homogeneous half-space. Both rigidity and density of the half-space are assumed to vary inversely linearly with depth. Separation of variable method has been used to get the analytical solutions for the dispersion equation of the torsional surface waves. Also, the effects of non-homogeneity and irregularity on the phase velocity of torsional surface waves have shown graphically.

5

Laminar mixed convection flow from a vertical surface with induced magnetic field and convective boundary

Chaudhary K., Sharma A., Jha A. K.

International Journal of Applied Mechanics and Engineering

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2018

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Vol. 23, no. 2

307--326

EN

The objective of this investigation is to study the influence of thermal radiation and radiation absorption parameter on a mixed convection flow over a continuously moving porous vertical plate under the action of transverse applied magnetic field taking into account the induced magnetic field with convective boundary. Under certain assumptions, the solutions for the velocity field, temperature distribution and induced magnetic field are obtained. The influences of various parameters on the velocity, temperature fields and on induced magnetic fields are studied graphically. It is also found that the dimensionless Prandtl number, Grashof number, Schmidt number and magnetic parameter have an appreciable influence on the independent variables.

6

An Innovative B2C E-commerce Websites Selection using the ME-OWA and Fuzzy AHP

Aggarwal A. G., Sharma A.

Annals of Computer Science and Information Systems

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2018

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Vol. 14

13--19

EN

Today internet has emerged as a huge marketplace of products and services for meeting needs of more than a million customers worldwide. It provides users a platform to access information globally in electronic form as well as in terms of business transaction, such as,e-payments, e-orders and e-booking etc. The advent of the internet has led to the establishment of electronic commerce. Today a large number of B2C e-commerce websites are available, which makes it difficult not only for the customers to find right product at right price, but also for a company to choose a better site for selling its product. Thus, there is need to rank e-commerce websites in B2C electronic commerce. The objective of this paper is to rank e-commerce websites on the basis of success factors, namely, System Quality, Content Quality, Usages, Trust, Customer Support, Online Customer Feedback and Personalization. Here we have used a two stage approach combining maximum entropy-ordered weighted averaging aggregation (ME-OWA) with fuzzy Analytic Hierarchy Process (FAHP) for choosing the best B2C e-commerce website.

7

A Perspective Approach (OABC) Algorithm using Square Odd Routing for minimized Energy Consumption

Sharma A., Sharma V. P., Sharma H.

Annals of Computer Science and Information Systems

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2018

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Vol. 14

151--154

EN

ABC set of principles has been already proposed furthermore with some drove guidelines, yet the length of the work parameter has been spinning round detecting the hubs in static or dynamic way with no accentuation at the power consumption parameter ideal from the crossing hubs vitality to warmth dissemination control or the entire charge for navigating or detecting every one of the hubs or the time admission for the hub records to get transmitted from one hub to each other. Our proposed work is essentially constructed generally in light of the sending of the system however now not arbitrarily but rather to some extent construct absolutely with respect to parameters. Our work proposed a totally one of a kind and favored an approach of ABC calculation for unpracticed detecting of actualities with regards to control looking after age. The proposed set of guidelines guarantees the identification of implied objective however with the ideal strategy with diminished vitality utilization. The ABC has a few applications for choosing the optical neighboring arrangement construct absolutely for the most part with respect to swarm knowledge. Our paper concentrates on the versatile system of ABC calculation with the versatile approach of the square and strange statute so as to pick the most appropriate course of unpracticed transmission. Our papers have changed the conventional approach of the honey bee state to keep successively in the meantime as not having any unique measurements. We have proposed an unpracticed switch based absolutely convention in WSN. We have proposed the square odd technique to improve the conventional strategy in the more prominent dynamic way. The considered arrangement of principles should offer rest to trade hubs in the meantime the unmistakable hub is vigorous. Our proposed procedure will definitely decrease the quality utilization and at the indistinguishable time will bring about looking through the related most astounding decent bearing to embellish the test results fabulously.

8

A comparative analysis of promethee, ahp and topsis aiding in financial analysis of firm performance

Sharma A., Kuur G., Bansal J.

Annals of Computer Science and Information Systems

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2018

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Vol. 14

145--150

EN

Multi-criteria decision making methods are extensively used in the decision making problems. Decision making is the activity of a person that helps obtain responses to the questions posed by a stakeholder in a decision process. This study compares the financial performance of seven companies in the banking sector listed on the National Stock Exchange (NSE) for years from 2014 to 2017. The PROMETHEE, AHP and TOPSIS methods are used independently to evaluate the financial performance and to decide on the best performing firm for the four year period. The evaluated ranks are then compared with the actual ranks (based on investments) using Spearman's rank correlation. The calculation of financial performance measures is based on four main criteria and nine sub-criteria. Using the following methods, our study suggests that Punjab National Bank (PNB) has the best financial performance as compared to other companies.

9

Distributed Situation Awareness in pilotage operations: implications and challenges

Sharma A., Nazir S.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2017

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Vol. 11, no. 2

289--293

EN

Pilotage is considered as the most critical leg of navigation and a complex operation in maritime domain. In this paper, we argue that Distributed Situation Awareness (DSA) is an important construct in pilotage as the information required to carry out operations is distributed between agents and artefacts. We identify the central themes from the theory of DSA which are useful in describing modern day complex socio-technical systems. Further, based on the central themes, we propose guidelines for evaluating bridge teams involved in pilotage operations.

10

Effect of fan arrangement and air flow direction on thermal performance of radiators in a power transformer

Paramane S. B., Van der Veken W., Sharma A., Coddé J.

Journal of Power Technologies

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2017

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Vol. 97, nr 2

127--134

EN

The focus of the present numerical work is to study the effect of fan air flow direction and mounting arrangement on the thermal performance of the radiators of power transformers using Computational Fluid Dynamics analysis. The study is carried out for four radiators of 3 m height and 30 fins with 0.52 m width and two fans of 1 m diameter in vertical and horizontal air flow directions. The horizontal flows from the two fans are considered in the same and the opposite direction, with the fans located on the same and the opposite side, respectively running at the same speed of 860 rpm for all configurations. Thermal radiation is modelled using the discrete transfer radiation model. A comparison of different flow and heat transfer patterns as well as heat dissipation - for the four different configurations - is presented. Velocity and temperature contours are used to visualize the heat and fluid flow distribution over the radiators. Fans placed on one side of the radiators result in larger heat dissipation than the other arrangements studied. The reasons for the improvement in heat dissipation are presented.

11

Mathematical modeling of torsional surface wave propagation in a non-homogeneous transverse isotropic elastic solid semi-infinite medium under a layer

Sethi M., Sharma A., Vasishth A.

International Journal of Applied Mechanics and Engineering

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2017

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Vol. 22, no. 2

415--426

EN

The present paper deals with the mathematical modeling of the propagation of torsional surface waves in a non-homogeneous transverse isotropic elastic half-space under a rigid layer. Both rigidities and density of the half-space are assumed to vary inversely linearly with depth. Separation of variable method has been used to get the analytical solutions for the dispersion equation of the torsional surface waves. Also, the effects of nonhomogeneities on the phase velocity of torsional surface waves have been shown graphically. Also, dispersion equations have been derived for some particular cases, which are in complete agreement with some classical results.

12

Propagation of SH waves in an regular non homogeneous monoclinic crustal layer lying over a non-homogeneous semi-infinite medium

Sethi M., Sharma A.

International Journal of Applied Mechanics and Engineering

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2016

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Vol. 21, no. 2

447--459

EN

The present paper discusses the dispersion equation for SH waves in a non-homogeneous monoclinic layer over a semi infinite isotropic medium. The wave velocity equation has been obtained. In the isotropic case, when non-homogeneity is absent, the dispersion equation reduces to the standard SH wave equation. The dispersion curves are depicted by means of graphs for different values of non-homogeneity parameters for the layer and semi-infinite medium.

13

CAC DPLB MCN: A Distributed Load Balancing Scheme in Multimedia Mobile Cellular Networks

Sharma A., Shah A., Chatterjee M., Bhattacharya U.

Foundations of Computing and Decision Sciences

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2016

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Vol. 41, No. 4

261--296

EN

The problem of non-uniform traffic demand in different cells of a cellular network may lead to a gross imbalance in the system performance. Thus, the users in hot cells may suffer from low throughput. In this paper, an effective and simple load balancing scheme CAC_DPLB_MCN is proposed that can effectively reduce the overall call blocking. This model considers dealing with multi-media traffic as well as time-varying geographical traffic distribution. The proposed scheme uses the concept of cell-tiering thereby creating fractional frequency reuse environment. A message exchange based distributed scheme instead of centralized one is used which help the proposed scheme be implemented in a multiple hot cell environment also. Furthermore, concept of dynamic pricing is used to serve the best interest of the users as well as for the service providers. The performance of the proposed scheme is compared with two other existing schemes in terms of call blocking probability and bandwidth utilization. Simulation results show that the proposed scheme can reduce the call blocking significantly in highly congested cell with highest bandwidth utilization. Use of dynamic pricing also makes the scheme useful to increase revenue of the service providers in contrast with compared schemes.

14

Analysis of QKD multifactor authentication in online banking systems

Sharma A., Lenka S. K.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2015

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Vol. 63, nr 2

545--548

EN

In the present scenario internet usage and the online banking sectors are experiencing spectacular growth. The Internet is the fastest growing banking channel today, both in the fields of corporate and retail banking. Banks prefer their customers to use the online banking facility as it reduces their cost, primarily through labour costs. The online banking system addresses several emerging trends: customers’ demand for anytime, anywhere service, product time-to-market imperatives and increasingly complex back-office integration challenges. Online fraud has become major source of revenue for criminals all over the globe. The challenges that oppose online banking are the concerns of security and privacy of information. This has made detecting and preventing these activities a top priority for every major bank. The use of single-factor authentication, such as a user name and the password, has been inadequate for guarding against account fraud and identity theft, in sensitive online banking systems. In this paper we are going to analyze the QKD multifactor authentication in online banking systems.

15

Influence of soret effect on mhd mixed convection flow of visco-elastic fluid past a vertical surface with hall effect

Jha A. K., Choudhary K., Sharma A.

International Journal of Applied Mechanics and Engineering

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2014

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Vol. 19, no. 1

79--95

EN

The present paper deals with the unsteady motion of an MHD free convection flow of an incompressible non- Newtonian viscoelastic fluid past an infinite vertical plate in the presence of a heat source and Soret effect. A parametric study illustrating the influence of various parameters on the temperature, velocity as well as on the skin-friction and rate of heat transfer is conducted. The results of the effect of the magnetic field, the parameter describing the non-Newtonian behavior, and the velocity of suction and injection on both the velocity and temperature distributions are examined and shown graphically.

16

Reducing Call Blocks in Cellular Network with Non-Uniform Traffic Conditions

Sharma A., Sharma P., Chaki R, Bhattacharya U.

Foundations of Computing and Decision Sciences

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2014

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Vol. 39, No. 4

301--318

EN

In cellular networks, while the motivation behind all basic channel assignment strategies is the better utilization of the available frequency spectrum with the consequent reduction of the call blocking probability in each cell, very few of them deal with the problem of non-uniform traffic demand in different cells which may lead to a gross imbalance in the system performance. Mobile users in hot cells (the cells with heavy traffic loads) may suffer from low throughput due to the load imbalance problem. In this paper, we propose a cost effective and simple load balancing scheme that can effectively reduce the overall call blocking. A common set of channels are determined dynamically which can be used simultaneously in all the cells. Cell tiers with different radii are used to cope with the interference introduced by using same set of channels simultaneously in all cells. The performance of the proposed scheme is presented in terms of call blocking probability and channel utilization. Simulation results show that the proposed scheme can reduce the call blocking significantly in highly congested cell.

17

Synthesis and optical characteristics of silver nanoparticles on different substrates

Budhiraja N., Sharma A., Dahiya S., Parmar R., Vidyadharan V.

International Letters of Chemistry, Physics and Astronomy

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2013

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Vol. 14

80--88

EN

Silver nanoparticles have been deposited on glass and polyethylene substrate by Chemical Bath Deposition (CBD) technique and Chemical rolling method. A comparative study has shown that Chemical bath technique is superior compared to rolling technique for uniform deposition of silver nanoparticles on glass substrate. Crystallography investigation of these materials is done by X-ray diffraction (XRD) which reveals that average grain size is in nano region. Scanning Electron Microscope (SEM) is used for topography study of these prepared nanostructures. Optical properties of the synthesized materials are studied by UV-VIS in detail to check their potential for next era industrial revolution.

18

Study of Stannous-Cerium Oxide Nanocomposites as Nanofilm, Nanodot and Nanorod

Budhiraja N, Sharma A., Kumar S., Kaur A., Unikrishnan N. V.

International Letters of Chemistry, Physics and Astronomy

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2013

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Vol. 14

69--79

EN

In the present paper, main emphasis is given to synthesize the Stannous-Cerium oxide nanocomposites in nanofilms, nanodots and nanorods by Chemical bath method, Chemical drop method and Chemical rolling Method. These nanocomposite materials are synthesized on a glass substrate at 100 °C temperature. Crystallography investigation of these materials is done by X-ray diffraction (XRD) which reveals that average grain size is 58.9 nm and 62.3 nm for nanofilms and nanodots on glass substrate respectively whereas XRD diffraction for nanorod on glass substrate reveals that material is amorphous in nature.

19

Resolution of propranolol and atenolol enantiomers on β-cyclodextrin-impregnated silica gel layers

Joshi S, Sharma A.

Acta Chromatographica

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2012

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Vol. 24, no. 2

317--322

EN

Enantiomeric resolution of two commonly used β-blockers, namely, (±)-propranolol and (±)-atenolol, has been achieved on silica gel layers which were bulkimpregnated with β-cyclodextrin. Solvent systems DMF-ethyl acetate-butanol (3:2:5, υ/υ) and butanol-acetic acid-ethyl acetate-ammonia (5:2:2:0.5, υ/υ) successfully resolved the enantiomers of (±)-propranolol and (±)-atenolol, respectively. The spots were located with iodine vapor. The effects of concentration of the chiral selector and mobile phase variation were also studied.

20

Spaces of entire functions represented by vector valued Dirichlet series

Srivastava G. S., Sharma A.

Journal of Mathematics and Applications

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2011

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Vol. 34

97--107

EN

Spaces of entire functions ƒ represented by vector valued Dirichlet series and having finite order and finite type are considered. These are endowed with a certain topology under which they become a Frechet space. On this space the form of linear continuous functionals is characterized. Proper bases are also characterized in terms of growth parameters.