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Applications of the homotopy analysis method to optimal control problems Shubham Singh. Real-time trajectory generation for constrained nonlinear dynamical systems using non-uniform rational B-spline basis functions M. Abstract The performance of different shock capturing viscosities has been examined using our general fluid mechanics algorithm. Four different schemes have been tested, both for viscous [ Abstract An implicit fractional-step method for the numerical solution of the time-dependent incompressible Naiver-Stokes equations in primitive variables is developed and studied [ Abstract An axisymmetrical numerical model has been developed in order to find the temporal evolution of pressure, the position of the exsolution level, the velocity field, the eruption [ Abstract In this paper we describe several finite element methods for solving the diffusion-convection-reaction equation.
None of them is new, although the presentation is non-standard [ Abstract In this paper we study a variational formulation of the Stokes problem that accommodates the use of equal velocity-pressure finite element interpolations. The motivation of [ Abstract In an earlier paper, Zienkiewicz and Codina Int. Full [ Abstract This research emphases on the synthesis of new formulations of intumescent coating with improved thermal performance for steel structures.
The coating formulations were based [ Abstract The objective of this paper is to analyse an iterative procedure for the finite element solution of the Stokes and Navier-Stokes stationary problems. For the latter case, [ The 4-th order Runge-Kutta RK4 integration method [ Abstract The computational modeling and numerical simulation of Friction Stir Welding FSW processes is an extremely challenging task due to the highly nonlinear and coupled nature [ Time integration algorithms for frictionless [ Abstract This paper deals with the computational modeling and numerical simulation of contact problems at finite deformations using the finite element method.
Quasi-static and dynamic [ Abstract This paper presents a numerical model of mould manufacture for the lost foam casting process. The process of mould filling with sand and sand compaction by vibration are modelled [ Abstract In this paper a numerical model for the analysis of coupled thermomechanical multi-body frictional contact problems at finite deformations is presented.
The multi-body frictional [ The thermal exchange between the [ Abstract The evolution of the contact surfaces wear may become particularly important in the definition of the frictional behavior, in particular for frictional contact problems involving [ Abstract We present a numerical procedure for elastic and non linear analysis including fracture situations of solid materials and structures using the Discrete Element Method DEM. Abstract Progressive fracture in quasi-brittle materials is often treated via strain softening models in continuum damage mechanics.
Such constitutive relations favour spurious strain [ Abstract We present a simulation tool for transient events in complex hydraulic networks. The code includes modelling of the transport of suspended cuttings in near-vertical wells.
Abstract The discrete element method DEM is an emerging tool for the calculation of the behaviour of bulk materials. One of the key features of this method is the explicit integration [ Abstract A novel algorithm to reproduce the arrangement of grains in polycrystalline materials was recently published by the authors. In this original approach, a dense package of [ Abstract Several theoretical contributions in order to establish a particle packing methodology are presented.
In this respect, a generic formulation of a new method for packing [ Abstract This paper presents an original thermomechanical model of rock cutting with evaluation of tool wear. The model has been developed within the framework of the discrete element [ Abstract A family of rotation-free three node triangular shell elements is presented. The simplest element of the family is based on an assumed constant curvature field expressed in [ Abstract A stabilized finite element method FEM for the multidimensional steady state advection-diffusion-absorption equation is presented.
The stabilized formulation is based on [ Abstract We present a mixed velocity-pressure finite element formulation for solving the updated Lagrangian equations for quasi and fully incompressible fluids. Details of the governing [ Abstract We present a general formulation for analysis of fluid-structure interaction problems using the particle finite element method PFEM. The key feature of the PFEM is the use [ Nowadays, understanding [ Abstract Residual stresses and distortions are two technical obstacles for popularizing the additive manufacturing AM technology.
The evolution of the stresses in AM components during [ Abstract The out-of-plane response is a complex and at the same time key aspect of the seismic vulnerability of masonry structures. It depends on several factors, some of which are [ Abstract This work studies the effect of the tool tilt angle on the generated heat and the material flow in the work pieces joint by Friction Stir Welding FSW.
An apropos kinematic [ Abstract This work studies computationally and experimentally the joint line remnant defects emerging in friction stir welding FSW due to oxide layer propagation into the weld. Abstract The present paper presents multiscale modelling via coupling of the discrete and finite element methods. Theoretical formulation of the discrete element method using spherical [ Abstract The importance of crack propagation in the structural behaviour of concrete and masonry structures has led to the development of a wide range of finite element methods for [ Abstract AM processes are characterized by complex thermal cycles that have a deep influence on the microstructural transformations of the deposited alloy.
In this work, a general [ Abstract Predictive models are essential in dam safety assessment. Both deterministic and statistical models applied in the day-to-day practice have demonstrated to be useful, although [ Abstract This paper describes some considerations around the analytical structural shape sensitivity analysis when the structural behaviour is computed using the finite element method [ Abstract n this paper, an experimental test performed on a hybrid steel plate girder was subjected to concentrated loads at the end of an unstiffened panel is presented.
This load [ Abstract The advances in information and communication technologies led to a general trend towards the availability of more detailed information on dam behaviour. This allows applying [ These values [ Abstract This paper presents advanced computer simulation of rock cutting process typical for excavation works in civil engineering. Abstract The main objective of this work lies in the development of a variational implicit Material Point Method MPM , implemented in the open source Kratos Multiphysics framework.
The problem of interest consists [ Abstract In this work an extended class of multilayer perceptron is presented. This includes independent parameters, boundary conditions and lower and upper bounds. In some cases, [ Abstract A nonlinear resultant shell element is developed for the solution of problems of composite plates and shells undergoing nonlinear static and nonlinear dynamic behavior with [ Abstract The paper presents a systematically numerical procedure based on the finite-element method for three-dimensional analysis of segmentally constructed prestressed concrete bridges [ Abstract The objective of ITER is to build a new Tokamak, with the goal of demonstrating the scientific and technical feasibility of fusion power.
The First Wall Panels are the inner [ Abstract An excavation process is a nonlinear dynamic problem that includes geometrical, material, and contact nonlinearities. The simulation of ground excavation has to face contact [ Abstract In this work we put the method proposed by van Hinsberg et al. Complex flow phenomena e. Abstract Uncertainties are a daily issue to deal with in aerospace engineering and applications. Robust optimization methods commonly use a random generation of the inputs and take [ Abstract We propose here an efficient approach for treating the interaction between membranes and fluids.
Slight compressibility of the fluid is assumed. Classical total Lagrangian [ Abstract This paper presents numerical modelling of rock cutting processes. The model consists of a tool—rock system. The rock is modelled using the discrete element method, [ Abstract This paper aims to present and validate a numerical technique for the simulation of the overtopping and onset of failure in rockfill dams caused by mass sliding.
This goal [ In the resulting coupled system of equations, the balance [ The physical phenomenon is difficult to model because of the uncertainties in the kinematics of the [ Abstract Se presenta un modelo de elementos discretos o distintos MED en la modelizacion del ensayo de traccion indirecta o ensayo brasileno Brazilian Test. Se realiza una comparacion [ Abstract The solid-shells are an attractive kind of element for the simulation of f orming processes, due to the fact that any kind of generic 3D constitutive law can be employed without [ They have been traditionally based on simple statistical tools such as the hydrostatic-season-time HST model.
These [ A non-local damage model [ Abstract In this work a kinematics for laminated beams enriched with a refined formulation ZigZag RZT , originally presented by Tessler et al. Abstract We present a new 2-noded beam element based on the refined zigzag theory and the classical Euler—Bernoulli beam theory for the static analysis of composite laminate [ The originality of this method [ The novelty of this method is the use of one-dimensional [ Mechanical properties and responses for off-design [ Abstract The aim of the present work is to present an overview of some numerical procedures for the simulation of free surface flows within a porous structure.
A particular algorithm [ Abstract Predictive models are an important element in dam safety analysis. They provide an estimate of the dam response faced with a given load combination, which can be compared [ Abstract The objective of this work is to describe the design and implementation of a framework for building multi-disciplinary finite element programs. The main goals are generality, [ A methodology based on the mixture of try-and-error method [ Abstract The paper presents advances in the discrete element modelling of underground excavation processes extending modelling possibilities as well as increasing computational efficiency.
Abstract We propose a simple technique for improving computationally the efficiency of monolithic velocity—pressure solvers for incompressible flow problems. The idea consists [ Abstract This paper demonstrates the big influence of the control of the mesh quality in the final solution of aerodynamic shape optimization problems.
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It aims to study the trade-off [ Abstract The paper investigates a robust optimisation for detail design of active shock control bump on a transonic Natural Laminar Flow NLF aerofoil using a Multi-Objective Evolutionary [ Abstract In this paper, we propose a computational algorithm for the solution of thermally coupled flows in subsonic regime.
The formulation is based upon the compressible Navier—Stokes [ They have been used in the fields of economics, engineering, computer science and biology due to their [ Abstract In this paper, the aerodynamic shape optimization problems with uncertain operating conditions have been addressed. After a review of robust control theory and the possible [ Abstract This paper presents a methodology for solving shape optimization problems in the context of fluid flow problems including adaptive remeshing.
The method is based on the computation [ Abstract A procedure to derive stabilized space—time finite element methods for advective—diffusive problems is presented. The starting point is the stabilized balance [ Abstract In this work, a novel phenomenological model is proposed to study the liquid-to-solid phase change of eutectic and hypoeutectic alloy compositions. The objective is to enhance [ Abstract This work studies the metallurgical and microstructural aspects of Friction Stir Welding FSW in terms of grain size and microhardness.
The modelling is based on the combination [ Abstract This paper discusses the modeling of cracking in quasi-brittle materials using isotropic and orthotropic damage constitutive laws. Abstract This work adopts a fast and accurate two-stage computational strategy for the analysis of FSW Friction stir welding processes using threaded cylindrical pin tools.
The coupled [ This phenomenon occurs between the pin and the workpiece as the rotating tool moves [ Abstract This paper discusses the finite element modeling of cracking in quasi-brittle materials. Abstract In-plane cyclic loading of masonry walls induces a complex failure pattern composed of multiple diagonal shear cracks, as well as flexural cracks. The realistic modelling [ Abstract Finite element macro-modeling approaches are widely used for the analysis of large-scale masonry structures. Despite their efficiency, they still face two important challenges: [ Abstract Damage-induced strain softening is of vital importance for the modeling of localized failure in frictional-cohesive materials.
This paper addresses strain localization of [ Abstract The testing of mode III and mixed mode failure is every so often encountered in the dedicated literature of mechanical characterization of brittle and quasi-brittle [ Two essential mechanical features are addressed, [ Abstract Tracking algorithms constitute an efficient numerical technique for modelling fracture in quasi-brittle materials. They succeed in representing localized cracks in the numerical [ The numerical results are compared with the experimental campaign carried out [ Abstract This work describes the local—global strategy proposed for the computation of residual stresses in friction stir welding FSW processes.
A coupling strategy between [ Abstract Electron Beam Welding EBW is a highly efficient and precise welding method increasingly used within the manufacturing chain and of growing importance in different industrial [ Abstract From the theoretical point of view, systems composed by masonry arches or vaults would require, during construction, the simultaneous activation of all structural elements [ Abstract A review of methods applicable to the study of masonry historical construction, encompassing both classical and advanced ones, is presented.
Firstly, the paper offers a discussion [ Toggle navigation. Library Groups. A bonded discrete element method for modeling ship—ice interactions in broken and unbroken sea ice fields.
In the paper, we introduce the most frequently encountered ice infested scenarios, the main characteristics of ice-breaking ships and the predicted failure modes of floe-ice depending on the loading conditions, the structure type and the ice feature dimensions and thickness.
For the simulations, a local bonded discrete element method DEM is used to model sea ice and its fractures. The packing of bonded spherical particles which reproduce the ice continuum can break due to ship—ice interactions and the failure modes are studied. A set of validation simulations are first carried out.
A level ice sheet breaking against an installed ice-breaking cone with different slope angles is studied, and the results are compared with other DEM simulations. Then, a group of bonded DEM simulations are performed to predict the different failure modes produced when an ice-breaking ship bow contacts with ice cakes and floe-ice of different dimensions and thickness, typical in broken ice fields. Chebyshev spectral collocation method approximations of the Stokes eigenvalue problem based on penalty techniques.
It is shown that the penalty method approach can successfully be adapted for the eigenproblem to rectify the associated problems such as the existence of zero diagonal entries in the resulting algebraic system. Two different schemes, namely, the standard penalisation with a small penalty parameter, and the iterative penalisation that enables relatively large parameters, are implemented. The employment of the latter leads to a so-called inhomogeneous generalised eigenvalue problem which requires a special attention.
A feasible solution strategy is presented which is adapted from a procedure based on Newton's method proposed for the corresponding standard inhomogeneous eigenvalue problems. Concerning the spatial discretisation, among other possible options, the Chebyshev spectral collocation method based on expanding the unknown fields in tensor product of Chebyshev polynomials is employed. It is shown that the method constitutes a novel way of efficiently examining the approximate eigensolutions of the Stokes operator with the use of Chebyshev spectral collocation method directly, without a decoupling of velocity and pressure.
Logarithmic conformation reformulation in viscoelastic flow problems approximated by a VMS-type stabilized finite element formulation. Codina , J.
Baiges , E. Abstract The log-conformation reformulation, originally proposed by Fattal and Kupferman , allows computing incompressible viscoelastic problems with high Weissenberg numbers which are impossible to solve with the typical three-field formulation. By following this approach, in this work we develop a new stabilized finite element formulation based on the logarithmic reformulation using the Variational Multiscale VMS method as stabilization technique, together with a modified log-conformation formulation. Our approach follows the term-by-term stabilization proposed by Castillo and Codina for the standard formulation, which is more effective when there are stress singularities.
The formulation can be used when the relaxation parameter is set to zero, and permits a direct steady numerical resolution. The formulation is validated in the classical benchmark flow past a cylinder and in the well-known planar contraction , achieving very accurate, stable and mesh independent results for highly elastic fluids. Dynamic term-by-term stabilized finite element formulation using orthogonal subgrid-scales for the incompressible Navier—Stokes problem.
Castillo, R. The essential point of the formulation is the time dependent nature of the subscales and, contrary to residual-based formulations, the introduction of two velocity subscale components. A key idea of the proposed method is that the convective subscale is close to a solenoidal field and the pressure gradient subscale is close to a potential field. Time-dependent semidiscrete analysis of the viscoelastic fluid flow problem using a variational multiscale stabilized formulation. Barrenechea, E. The formulation has shown to have accuracy and robustness in the different benchmarks tested in the viscoelastic framework, and permitting the use of equal interpolation of the unknown fields.
We first present results about a linearized subproblem, for which well-posedness and stability results can be proved. Then, the semidiscrete nonlinear time-dependent case is addressed using a fixed point theorem, which allows us to prove existence of a semidiscrete solution, along with error estimates. Solution of low Mach number aeroacoustic flows using a Variational Multi-Scale finite element formulation of the compressible Navier—Stokes equations written in primitive variables.
Bayona, J. Baiges , R. We also include a weak imposition of implicit non-reflecting boundary conditions in order to overcome the challenges that arise in the aeroacoustic simulations at low compressibility regimes. Several benchmark flow problems are studied, including transient examples and aeroacoustic applications. Pont, O. Guasch, J. Codina , A. The flow eddies in that region become a source of direct aerodynamic sound, which is also diffracted by the speech articulators and radiated outwards. The numerical simulation of these phenomena is complex. A stabilized finite element method that acts as a large eddy simulation model has been adopted to solve the flow dynamics.
Also, a numerical strategy has been implemented that allows the determination, in a single computational run, of the separate contribution of the sound diffracted by the upper incisors from the overall radiated sound. Results are presented for points located close to the lip opening showing the relative influence of the upper teeth depending on frequency. Finite element modeling of nonlinear reaction-diffusion-advection systems of equations.
Komala, R. Heat and Fluid Flows Abstract Purpose This paper aims to present a finite element formulation to approximate systems of reaction—diffusion—advection equations, focusing on cases with nonlinear reaction. The formulation is based on the orthogonal sub-grid scale approach, with some simplifications that allow one to stabilize only the convective term, which is the source of potential instabilities.
The space approximation is combined with finite difference time integration and a Newton—Raphson linearization of the reactive term. Some numerical examples show the accuracy of the resulting formulation. Applications using classical nonlinear reaction models in population dynamics are also provided, showing the robustness of the approach proposed.
The formulation designed has been implemented in a computer code. Numerical examples are run to show the accuracy and robustness of the formulation. Findings The stabilized finite element method from which the authors depart can be adapted to problems with nonlinear reaction. The resulting method is very robust and accurate. The framework developed is applicable to several problems of interest by themselves, such as the predator—prey model.
Original contributions are the design of the stabilization parameters and the linearization of the problem. The application examples, apart from demonstrating the validity of the numerical model, help to get insight in the system of nonlinear equations being solved. Stationary and time-dependent numerical approximation of the lid-driven cavity problem for power-law fluid flows at high Reynolds numbers using a stabilized finite element formulation of the VMS type.
Aguirre, E. Castillo, M. Cruchaga , R. For more convective flows, the solution becomes unstable, describing an oscillatory behavior. A VMS formulation is presented to be validated using existing results, to determine flow conditions at which the instability appears, and lastly, to establish new benchmark solutions for high-Reynolds numbers fluid flows using the power-law model.
Obtained results show a good agreement with those reported in the references, and new data related with the oscillatory behavior of the flow has been found for the non-Newtonian case. In this regard, time-dependent flows show dependence on both Reynolds number and power-law index, and the unsteady starting point has been determined for all studied cases. On hp convergence of stabilized finite element methods for the convection—diffusion equation. The methods discussed are classical-residual based stabilization techniques and also projection-based stabilization methods.
The use of this estimate is not needed in a particular case of H1- projection-based methods, and therefore the theoretical lack of convergence described does not exist in this case. Variational multiscale error estimators for the adaptive mesh refinement of compressible flow simulations. Bayona, R. These subscales are defined to be orthogonal to the finite element space, dynamic and non-linear, and both the subscales in the interior of the element and on the element boundaries are considered.
Unified solver for fluid dynamics and aeroacoustics in isentropic gas flows. Pont, R. Baiges , O. Therefore, a joint isentropic formulation for flow and aeroacoustics can be devised which avoids the need for segregating flow and acoustic scales. Under these assumptions density and pressure fluctuations are directly proportional, and a two field velocity-pressure compressible formulation can be derived as an extension of an incompressible solver. In this sense, a separated imposition of boundary conditions for flow and acoustic scales which allows the evacuation of waves through Dirichlet boundaries without using any tailored damping model will be presented.
Stabilized mixed finite element method for the M1 radiation model. Schmid, Y. Mesri, E. Hachem, R. The question of dealing with heterogeneous physical properties is also considered, and treated by means of an immersed method. The comparison against a large eddy simulation model is presented for numerical discretizations in which the grid is not capable of solving the small scales.
Variational Multiscale error estimators for solid mechanics adaptive simulations: An Orthogonal Subgrid Scale approach. The main idea is to consider a rich model for the subgrid scales as an error estimator. Interpolation with restrictions between finite element meshes for flow problems in an ALE setting.
Abstract The need for remeshing when computing flow problems in domains suffering large deformations has motivated the implementation of a tool that allows the proper transmission of information between finite element meshes. Because the Lagrangian projection of results from one mesh to another is a dissipative method, a new conservative interpolation method has been developed. Unlike other conservative interpolation methods that require a considerable effort in mesh generation and modification, the proposed formulation is mesh independent and is only based on the physical properties of the field being interpolated.
Moreover, the performed corrections are neither coupled with the main calculation nor with the interpolation itself, for which reason the computational cost is very low.
Numerical analysis of a stabilized finite element approximation for the three-field linearized viscoelastic fluid problem using arbitrary interpolations. Mathematical Models and Methods in Applied Sciences The three-field viscoelastic fluid flow problem may suffer from two types of numerical instabilities: on the one hand we have the two inf-sup conditions related to the mixed nature problem and, on the other, the convective nature of the momentum and constitutive equations may produce global and local oscillations in the numerical approximation.
Both can be overcome by resorting from the standard Galerkin method to a stabilized formulation. The one presented here is based on the subgrid scale concept, in which unresolvable scales of the continuous solution are approximately accounted for. In particular, the approach developed herein is based on the decomposition into their finite element component and a subscale, which is approximated properly to yield a stable formulation. The proposed method permits the resolution of the problem using arbitrary interpolations for all the unknowns.
We describe some important ingredients related to the design of the formulation and present the results of its numerical analysis. It is shown that the formulation is stable and optimally convergent for small Weissenberg numbers, independently of the interpolation used. Pont, E. This mesh is successively refined and unrefined at each time step in order to focus the computational effort on the spatial regions where it is required. Smooth solution fields for both velocity and pressure are obtained as a result of the contribution of the stabilization terms.
Finally, a good agreement between the numerical results and the reference experimental data is obtained. Finite element approximation of the viscoelastic flow problem: A non-residual based stabilized formulation. Starting from a residual based formulation, a non-residual based one is designed, the benefits of which are highlighted in this work. Additionally, some results from the numerical analysis of the formulation are stated. Numerical examples are presented to show the robustness of the method, which include the classical 4: 1 planar contraction problem and the flow over a confined cylinder case, as well as a two-fluid formulation for the planar jet buckling problem.
A pseudo-compressible variational multiscale solver for turbulent incompressible flows.gulfcompticwi.gq
Yang, S. Badia, R. We evaluate the effect of the artificial compressibility on the accuracy of the explicit formulation for under-resolved LES simulations. A set of benchmarks have been solved, e. The resulting method is proven to be an effective alternative to implicit methods in some application ranges in terms of problem size and computational resources , providing comparable results with very low memory requirements. Guasch, P. Pont, J. As for any hybrid computational aeroacoustics approach, a first computational fluid dynamics simulation is carried out from which the mean flow characteristics and acoustic sources are obtained.
In a second step, the APE are solved to get the acoustic pressure and particle velocity fields. However, resorting to the finite element method FEM for that purpose is not straightforward. Whereas mixed finite elements satisfying an appropriate inf—sup compatibility condition can be built in the case of no mean flow, that is, for the standard wave equation in mixed form, these are difficult to implement and their good performance is yet to be checked for more complex wave operators.
It is possible to avoid them by resorting to stabilized formulations. The key of the approach resides in the design of the matrix of stabilization parameters. A stabilized finite element method for the two-field and three-field Stokes eigenvalue problems. Boffi, R. As a distinguished feature of the present study, we take the space of the unresolved subscales orthogonal to the finite element space, which promises a remedy to the above mentioned complication. Thus, we do not need to put the whole residual in the formulation, and the linear eigenproblem form is recovered properly.
We report several numerical tests in order to illustrate that the theoretical results are validated. Variational multi-scale finite element approximation of the compressible Navier-Stokes equations. Abstract Purpose The purpose of this paper is to apply the variational multi-scale framework to the finite element approximation of the compressible Navier-Stokes equations written in conservation form.
While the auditory-visual-tactile feedback combination produced the fastest task completion time, there was no significant improvement in operator performance between the four feedback settings tested. Through further understanding of the most preferred feedback modes, or combination of such, identification of improved scanner settings for this device and task can be made.
Keywords : Feedback modalities; redundant feedback; handheld device; wand formfactor; haptic feedback; audible feedback; visual feedback; industrial scanning; service industry; distribution. This satisfaction is measured through patient surveys and understanding patients perceptions of the services they are offered. Increasingly, patient satisfaction has been regarded as a major factor in measuring overall service quality of a healthcare firm. One area that hospitals have found challenging is their service offered over the phone. It is therefore important to observe the call centre operations within a healthcare organization to fully understand what leads to patient dissatisfaction, and thereby recommend ideas to improve patient satisfaction.
The present study analyses a hospital that is facing challenges related to their phone services. The goal is to improve the overall service quality, ultimately leading to improvement in patient satisfaction. Quality tools such as Pareto Analysis and Fishbone Diagrams were used to conduct the analysis. Then, quantitative models from waiting line management were used to determine optimal staffing levels of call centre agents and triage nurses to meet quality goals as stipulated by the management, in terms of acceptable customer waiting time.
This literature review has been undertaken to examine the published literature available on PDS followed the world over, with a specific focus on India. The paper analyses the PDS stakeholders and its components for deficiencies and addresses the solutions for its improvement given in the available literature. The various dimensions of the PDS studied, reveals numerous gaps between the deficiencies identified in the current system and measures to overcome the same. A future research agenda towards increasing the efficiency and efficacy of the PDS supply chain management has also been brought out by this paper.
To understand these dimensions and their impact on supply chain performance, we have analyzed three triadic relationships. Examples in this research paper involve a hospital buyers managing high-cost supplies with outside vendors, but influenced by its physicians; b specialized hospital outpatient units that need to coordinate patient flow with medical staff and attending physicians; and c logistics service providers with assets managing its demand with external customer through an internal brokerage service.
Specifically, we have analytically evaluated organizational- pressures hierarchical versus bureaucratic , practices scheduling, time-blocks , and structures captive versus autonomous and how they influence alignment between interactions in the respective triads to ultimately affect performance, namely, lower supply expenses; balancing customer satisfaction and asset utilization; and profitability. Keywords : Triads; alignment; professionalization; time-blocks; scheduling; simulation; autonomous; captive. Using selected intrinsic and extrinsic motivational factors grounded in Consequentialism, Deontology, and Virtue perspectives, an empirical study was conducted on highly educated knowledge workers in the Pittsburgh, PA area.
Many male respondents felt that engaging in sport-related betting within the workplace was more acceptable than their females and tended to feel more utilitarian in their approach to justify such actions. Typically a Deontology-based ethical perspective suited males as they felt that sport-related gambling activities had a more positive impact on the emotional state of the office atmosphere and were more willing to become personally less productive and use company resources at work during sporting events.
Keywords : case study; cyberdeviance; ethical perspectives; gender differences; sports gambling; Uses and Gratifications Theory; worker productivity. These applications provide necessary data for better decision-making; lowering costs by optimizing rig activity time, besides reducing travel and logistics costs.
The purpose of this study is to determine perceived value and quality from a specific real-time data transmission solution. A quantitative method was applied through an online survey to test the evaluation model of the data transmission solution of an oil operator in Brazil. It was found that the main factor responsible for dissatisfaction is related to technical support. This approach can be used for other solutions and services and showed as being scalable to different scenarios in the oil industry.
As such, a poor sourcing decision has a significant trickle-down effect on the effectiveness of a buying firms manufacturing and logistics decisions. Considering such significance, it is imperative for the firm to make a wise, systematic decision in evaluating and selecting suppliers. To support a critical sourcing decision, we propose a supplier evaluation decision-aid tool within the framework of business analytics which takes into account the multiple facets of supplier performance evaluation criteria.
As a core of such a tool, we develop a relatively new model which is capable of considering both objective and subjective performance criteria simultaneously using a combination of data envelopment analysis DEA and analytic hierarchy process AHP. To verify the practicality and validity of the proposed analytics-based tool, we applied it to an actual problem facing a U.
Keywords : decision analysis; business analytics; supplier evaluation; aerospace procurement. The study investigated the case of Jordanian hotel workers by conducting two focus groups with 16 participants, followed by 25 in-depth interviews. Passion depends on the presence of psychological personal attachment , and situational extrinsic aspects. Passionate workers are assumed to show enthusiasm, commitment, and loyalty, representing the behavioural aspect of passion.
Furthermore, passion is conceived as an advanced state but not detached from job involvement, engagement, and organizational commitment, meaning these can be engendered by the effect of passion. Although the Jordanian hotel employees were found to be not very different in terms of their conceptualizing of work passion, this study presents new factors that are assumed to affect passion.
Finally, contrary to what is proposed in the literature, passion was perceived only as a positive state and distinct from workaholism. Keywords : work passion; job involvement; job engagement; organizational commitment; hotels; Jordan. Supply chain risk management and the role of project managers: a Comparative analysis of U. This paper investigates the patterns of product risk management utilized by U. Key findings include 1 U.
Here, the return rate is considered to be a variable which depends upon the acceptance quality level of the returned items. The manufacturer performs manufacturing and remanufacturing processes to satisfy the retailers demand. The manufacturing process is assumed to be imperfect and produces some defective items. All defective items are then reworked via reworking process. Two recovery processes are considered in the model, which are remanufacturing and refurbishing. The recoverable items which cannot be perfectly recovered will be categorized as refurbishable items and then sold to the secondary market at a reduced price.
A solution methodology is provided to find the optimal solutions of the model. A numerical example and sensitivity analysis are performed to show the application of the model and to understand the effects of the changes in key parameters on the models behavior, respectively. Keywords : remanufacturing; closed-loop supply chain; recovery; inventory; inventory model; refurbishing; imperfect production.
But how can the central and influential network positions be found in the value network? The position of actors is extracted using the hidden structure method HSM and centrality metrics of social network analysis SNA. Both analyses apply adjacency matrix data that reveal direct dependencies of actors in a value network. We measured indegree, outdegree, betweenness, and closeness centralities to each actor to compare SNA and HSM results.
HSM can reveal the actors who conduct the most significant activities, as well as more peripheral actors who have a strong influence on core actors. Thus, HSM does not neglect the hierarchy between actors. Our methodological contribution suggests that in parallel with widely used SNA centrality measures, researchers should leverage HSM to define influential actors.
Two pharmacy concepts in Finland provide the empirical research context. Keywords : value network; network structure; network position; actor; role; hidden structure method; social network analysis; pharmaceutical network; centrality; adjacency matrix. A large Indian foundry facility is utilized to illustrate the adopted approach. Firstly, current state mapping is prepared to have the knowledge of the existing procedure followed in the production of castings.
In addition, relevant data such as, cycle time, changeover time, percentage of defects, percentage downtime and inventory in between the processes are collected for each process. Further, the future state map is created, after amending the entire process, by adopting the methodology proposed by Rother and Shook Additionally, the required buffer size number of Kanbans at each stage and the sequence of production are also estimated by adopting the method advocated by the Lean Enterprise Institute Finally, improvement is accounted in terms of reduced lead time of the process.
Given the divergent views of what the field actually includes, this paper attempts to contribute to an ongoing debate about the current state of the field as a research field and its future development. The paper uses Lakatos view that suggests that instead of individual theories, scientific progress should be viewed in the context of research programs, which consist of the hard core and the protective belt. To identify subfields, the paper combines the literature review with a co-citation network analysis of the behavioral operations management field between and Six clusters are identified.
The Domain base cluster represents the hard core of the field, while five other clusters Newsvendor, Bullwhip and inventory optimization, Social goals, Supplier relationship, and Organizational behavior represent its protective belt. In addition to the exploration of existing clusters, the analysis in the paper offers an excellent starting point to identify and position further research questions.
A study like this is easily replicable and enables following the evolution of the field. Keywords : behavioral operations management; research program; network analysis; co-citation analysis; cluster analysis. In order to respond to requests as fast as possible, the emergency medical centers should be planed in the best condition. There are some cases that affect on emergency medical service operation, like calls distribution, traffic condition and operative costs. The paper combines the optimization techniques with simulation in locating the emergency medical centers in order to decrease the operative costs and also increase the quality of medical emergency services.
The method first, locates the centers using optimization techniques, and then having assigned the ambulances to the centers, it analyzes different scenarios of locating the centers and assigning the ambulances to them in a dynamic method using computer simulation. The proposed method of emergency centers location and ambulance-assignments was implemented in Isfahan Iran as a case study and resulted in lower response time.
The comparison of results with real situations shows the efficiency of this method. The construction of the IT techno parks, development in infrastructure and availability of the right talent pool from the premier colleges in Coimbatore present a promising future for Coimbatore to become the next IT destination in India, beating Chennai IT industry that offers attractive salaries and perks of different kind to the employees. The talented employees always seek the best prospectus for career growth and compensation and they have wide opportunities available in the vast industry.
Retaining the right talent plays a crucial role in the success of the organization. This study examines the perception of the IT employees of the Tidel Park in Coimbatore towards the retention strategies followed in their companies. Salary package, Retention bonus, onsite opportunities, promotion are found to be some of the significant retention factors. The methodology used was a literature review about the theme industrial service and the case study was supported by semi-structured interviews.
The results showed that twelve of the thirteen CSF found in the literature review are completely executed by the company studied, while one is partially applicable. The value of this paper lies in the fact that there is a low number of publications about the subject, especially in South America, highlighting the originality of the study proposed. Keywords : industrial service management; services; service operation management; service industry; critical success factors; industrial service; service sector. The manufacturer sells a product through the Internet and through the retail channel, simultaneously.
It is assumed that the market is controlled by the manufacturer. Thus, the manufacturer becomes leader and the retailers perform as followers. In this setting, the Bertrand and Collusion game-theoretic models are developed to analyze the pricing strategies among the retailers.
Then, the equilibrium decisions are compared and some managerial insights are presented. It is found that the manufacturers profit and the profit of the whole system given by the Bertrand game are higher than by the Collusion, while this inference is reversed for the retailers profits. Moreover, larger the number of the retailers in the retail channel leads to lower retailers profits, whereas the manufacturers profit and the profit of the whole system increase. Over 17, observations were recorded from the operations of 27 offices in North Carolina and analysis performed on the same to delineate operational factors that impact service quality.
The study also provides evidence of the consistency of NCDMVs compensation rates, a surprising result given that these rates were not set by the legislature after adequate data-based analyses. Theoretical implications of the findings are discussed along with the legislative impact of this study. This paper examines the level of importance attributed by consumers to different elementary services customarily provided by companies in the passenger airline industry.
It determines if, and to what extent, this is influenced by consumers socio-demographic characteristics of education, occupation, income, age, gender, and marital status. A total of 20 elementary services often offered by companies in the international passenger airline industry were examined. Findings of the empirical research that was carried out revealed that, while occupation, education, and marital status had no apparent influence; age, gender, and income tend to exert significant influence on the level of importance that consumers attach to services offered in the passenger airline industry.
Managerial implications of this result are discussed, and directions for future research are suggested. With rapidly increasing global competition, elimination of waste and continuous improvement of productivity is vital that greatly depends on how people plan, organize and utilize the facilities in an organization.
In facility layout problems, objective functions are modeled with different objectives that include minimization of cost or flow of materials, maximizations of closeness rewards etc. This paper proposes a mathematical model with a continuous representation of distance based adjacency matrix. The resulting exact model will consider every all-rectangular-department solutions. A nature-inspired firefly algorithm is applied to find out the solution of the model. Keywords : Facility layout; Firefly algorithm; Multi-objective Optimization. The supplier offers a creditrnperiod that is less than the average duration of the inventory model.
The lead time of receivingrnproducts from the vendor to a buyer is a variable which is controllable by adding extra crashing cost. A mathematical model is derived to investigate the effects of ordering cost reduction,rnpermissible delay in payments and investment for quality improvement and it can be achievedrnby optimizing the order quantity, lead time and total number of deliveries in one production runrnsimultaneously with the objective of minimizing joint expected total cost JET C.
Furthermore,rnthe sensitivity analysis is included and the numerical examples are given to illustrate the results. Keywords : Integrated inventory model; Permissible delay in payments; Exponential crashing cost; Investment for quality improvements; Ordering cost reduction. The aim of this study is to identify and evaluate the most important capabilities for the operations strategies used by MSEs in Brazil, to determine whether the degree of importance given to each capability influences the performance of the same, and to ascertain whether companies have strategic alignment.
In methodological terms, this is an exploratory and explanatory quantitative study. Questionnaires were distributed to a sample of 1, MSEs, and we used multinomial logistic regression for the data analysis. These MSEs consider reliability the most important operational capability. A positive relationship was observed between the importance given to a capability by the firm and the probability of achieving superior performance in this capability relative to its competitors.
Moreover, most of the researched firms presented strategic alignment. Grounded theory, action research and an inductive approach has been selected. Due to the nature of the topic requiring the exploration of culture, it is beneficial to utilise qualitative research which is provided by grounded theory that has been adopted. Thus, adhering to the grounded theory process utilising an issue focused approach, Sackmann, Semi-structured interviews, observations and focus-groups were chosen to conduct this exploratory study.
All these aspects have been aggregated through focus groups to 7 main themes. The purpose of this study is to outline the potential of Lean Management as a successful approach to increase efficiency and productivity in operational processes in the hospitality industry. We demonstrate that the proven potential of Lean methods in fields like manufacturing can be successfully transferred to the needs of the hospitality industry. As a result, the research shows a selection of Lean methods which are particularly suitable for application in the hotel sector.
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This study is based on a real case study in order to test the practical application of Lean methods in hospitality. Our research contributes to process optimization in hospitality and can be directly implemented by practitioners. Further it provides future directions in the transformation of Lean methods through digitisation. Keywords : lean management; lean hospitality; lean hotel; digitisation; industry 4. This has the capacity to promote the understanding of regional and global tourism environment through additional alternative methods.
Several studies on organizational performance have deployed the conventional planning and strategies to determine the best alternative that could accelerate business performance and sustain its environment. Evidence from the study reveals that scenario planning has a direct positive effect on non-financial performance of business organizations in the hospitality industry. Thus, the study emphasizes that scenario planning is fundamental and practical strategic tools that could be deployed to accelerate non-financial performance. Its main purpose is to bring back the discussion on consumer satisfaction and loyalty topics that are currently not receiving adequate attention by service management researchers.
As a field grows, integrative review addresses the need to aggregate, critique and re-conceptualize the knowledge, as it continues to develop, this being particularly appropriate when contradictory evidence appears Torraco Nevertheless, this article summarizes comments and integrates the most important models and theories concerning consumer satisfaction models, and adds suggestions for future research.
Keywords : service quality; satisfaction models; satisfaction antecedents; integrative review; loyalty; service management; servqual; rsq; service quality model; quality dimensions;. Thus ensuring optimum task performance in construction project delivery is perceived to be influenced by the level of project team effectiveness and team control. However, little is known about the influence of the dynamics of team control on the effectiveness of construction project teams in task and project team performance.
The aim of this study was to explore the effects of the dynamics modes of team control on the level of team effectiveness in construction project delivery. Through a deductive research approach, a partial least square structural equation modelling PLS-SEM was used on data collected through questionnaire survey conducted in South Africa. This suggests that formal control in project teams makes substantial effects to the level of team effectiveness in project delivery whereas in the case of informal control, it effects could be interpreted as being moderate at the 0. From these findings, it can be considered extremely significant for project teams to enhance and legitimize their formal and informal controls in project delivery towards improving the effectiveness of the team in task and team performance.
Keywords : team control; team effectiveness; project delivery; teamwork. Its unique contribution is the use of national-representative secondary data on the hospitality industry in Thailand, as a case of a major tourist destination country. Covering 2, hotel observations, our estimated regression indicates that service facilities affect native Thai guests and foreign non-Thai guests differently, which can lead to different strategic actions for each group. Among all kinds of service facilities, providing Internet service seems to be the greatest contribution to hotel performance.
Therefore, in terms of managerial implications, hotel managers should make providing a sound Internet connection a priority in order to ensure the successful short-term and long-term performance and development of their business. As for social implications, especially among small and medium-sized hotels, improving hotel performance by upgrading service facilities is another important tool in promoting tourism as a poverty reduction strategy.
The present research focuses on the analysis of the effect of backorders on the IPPDP problem in a three-echelon supply chain that consists of suppliers, manufacturers and retailers. The total net profit obtained for the scenario involving lost sales is compared with that for the scenario which involves lost sales and backordering.
For a set of problem instances, an increase of Keywords : Integrated procurement; production and distribution; backordering; lost sales. The research statistical population included the staff and faculty members of Azad University in Isfahan. Required data were collected based on research model and through distributed questionnaire among staff and faculty members and for investigating the relationship among variables and testing hypotheses, multi-variable regression and structural equations path analysis have been used. Validity of the questionnaires was examined and verified consulting the university professors and experts, and the questionnaires reliability was determined by calculating their Cronbachs alpha, that, indicating adequate reliability of them.
The results have presented that in confident level of 95 percent, there is a significant and positive relationship between psychological capital and the quality of working life as well as psychological capital and with organizational citizenship behavior. The variable of working life quality has also significant and positive relationship with organizational citizenship behavior.
The other finding of research was the significant effect of mediating variable of working life quality according to relationship between psychological capital and organizational citizenship behavior. Keywords : psychological capital; working life quality and organizational citizenship behavior. Via the use of scenario analysis, applied in an in-depth case study that uses plastic buckets for packaging, decision alternatives and uncertainties are considered. For each combination, market, technical and financial feasibility are examined. For each scenario, a single decision alternative was selected from these four possible decision alternatives: Full Backward Integration, Taper Integration, Partial Integration and No Integration Keywords : manufacturing strategy; decision making; Recycle versus Buy; scenario analysis.
Firms that effectively implement customer-focused supply chain strategy are much more likely to achieve better corporate performance in terms of sales, profitability, market share and even customer satisfaction. Customer-focused supply chain also enhances capabilities of the firm to adapt to the rapidly changing business environment. In customer-focused supply chain strategy, supply chains are much more customer focused - they deliver great service at lower cost and a key ingredient of their success is strong emphasis on responsiveness, resiliency, reliability and realignment 4Rs among supply chain partners, where all are focusing on customer value proposition.
This research has developed various frameworks and presented various case studies to emphasize 4Rs as important drivers of customer-focused supply chain strategy. A grid system makes it feasible to run great computing operations through the connected processors.
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In this article, a bi-objective problem of grid scheduling based on quality of service concept is discussed. The first objective is to increase the profit earned from customers and the second, to increase the utilization of computational resources. A mathematical programming model is proposed for the problem and a meta-heuristic NSGA-II algorithm is designed and customized for the problem. In the numerical analysis, by drawing Pareto diagrams and analyzing the sensitivity thereof, the efficiency of the proposed methods and the effect of different parameters of the problem on both the methods are assessed.
According to the results, the proposed NSGA-II algorithm is highly efficient in terms of solution quality and run time. Apparel sector is the largest gross export which contributes as the largest net foreign exchange earner from in Sri Lanka Dheerasinghe, As a leading apparel brand in Sri Lanka, the ABC Company continuously faces a decreasing movement in operational efficiency. This research examines the factors affecting towards the operational efficiency of the ABC Company to avoid operational inefficiency.
Therefore, as a major finding of the study, it has identified the inventory management as the most largely affecting factor towards operational efficiency and the second highest influencing factor as the labour productivity. The least influencing factor is the information system management. However, to make these operations sustainable, continuous improvement is essential. It has been proved in the literature that lean approaches enhance the performance for not only manufacturing sector but also service sectors. The aim of this study is to explore the potential benefits of lean approaches in the banking sector of Jordan.
Three most effective approaches are total quality management TQM , 5S services and Kaizen have been adopted and applied. A questionnaire has been developed and distributed by convenience sampling in all banks of Jordan. A total of responses have been considered and SPSS 23 has been used for data analysis.
The results revealed that all three approaches positively and significantly enhance the operational performance of banking sector. This study will help the managers of banks to make their operations more efficient and productive. For further studies, there is need to test more approaches and especially qualitative investigation to more explore the lean concept.
Keywords : Lean production; Lean practices; Operational performance; Large manufacturing. The proposed model seeks to minimise the total costs associated with the production planning and the cell construction and formation under a dynamic system. To validate the model, it is first converted to a linear programming.
Then, a numerical example is presented based on which the branch and bound method is used to solve it employing the Lingo 8 software. Besides, due to NP-hardness of the problem, two meta-heuristic algorithms namely a GA and a PSO are utilised to solve large-scale problems. In addition, the Taguchi method is used to calibrate the parameters of the meta-heuristics in order to find better quality solutions.
Computational results confirm the efficiency and the effectiveness of the proposed solution algorithms. Keywords : Dynamic cellular manufacturing system; Production planning; Cell formation; Mathematical programming; Limited resource; Genetic algorithm; Particle swarm optimization. The extension of services has expanded considerably, yet their correct combination with products is still problematic to manufacturers. Services are characterized by ambiguities and vagueness, hindering their effective implementation. Conventional product design tools such as Quality Function Deployment QFD are limited when comprehending the intangibility of services and hence evaluating and prioritizing customer requirements.
To address this topic, QFD is adapted to a service context through the integration of the fuzzy logic and the Analytic Hierarchy Process AHP as a means of reducing inaccuracies. The approach is applied to a case study in the medical field and its results are compared to the traditional QFD to analyse its outcomes and the effectiveness of the augmentations in increasing the usefulness of QFD in a PSS context.
Keywords : Service requirements; product-service systems; customer requirement prioritization; quality function deployment; analytic hierarchy process; fuzzy logic. This is particularly true when one considers the paucity of previous studies that have explored the linkages of service operations designs and the construct of SDMs work identity. This paper, using the lens of identity theory, explores the impact of creating an appropriate service operations design, using systems thinking principles, on the restoration of SDMs work identity and behaviour. Using multiple-case study approach in three organisations service Departments in the UK, the results demonstrate that the systems thinking for service operations design is an enabler for promoting dramatic changes to the role of SDMs in the workplace.
These dramatic changes are resembled by the creation of a transformational management style, changing the role of SDMs from employees monitors to supporters, and adoption of new discursive practices that are embracing more people-cantered perspective. While the paper introduces an interesting theorization of managers identity with systems thinking methodology, it also contributes, for the first time, a discussion of managers identity theory to the service system design literature in a highly-demanding business environment.
Kaizen costing as a culturally-based tool: a Portuguese case-study. Indeed, nowadays it is well recognised that what best distinguishes an organisation from its competitors are not physical and tangible characteristics. Intangible dimensions, like organisational culture, play an important role in organisational success or failure. This research argues that organisational culture interacts with kaizen costing so that effective implementation of kaizen requires a special organisational cultural puzzle.
A qualitative approach was adopted. The case study method was used to understand how kaizen costing interacts with organisational culture. The findings suggest that effective implementation of kaizen costing requires a high level of culture coherence. Further research is necessary before we can consistently generalise our conclusion. However, our findings bring new insights to the role of low-level workers in effective implementation of strategic options like kaizen and highlight the importance of intangible assets like organisational culture.
This article draws attention to the tenuous frontier between kaizen costing and lean production, and it puts organisational culture on the centre. It increases the value added activities in production process by eliminating non-value activities and reducing the work-in-process. This paper signifies the implementation of VSM in a garment industry, as a start-up to lean manufacturing.
Initially, an analysis with VSM is performed to determine the processes and material flow. It describes the current state for existing position and future state for the proposed development plan, particularly segregating value activities and non-value activities. Based on the outcomes, the fulfillment of value stream implementation are reduction in production time, inventory level and lead time.
This implementation of VSM in middle range garment industry shows significant improvements. Hence, the understanding of this implementation is essential to adapt in similar garment industries to identify improvements in small and medium scale industries. Keywords : Garment industry; lean manufacturing; value stream mapping. The integrated model utilizes Value Stream Mapping VSM and plant layout for identifying wastes from current state of the organization.
This model utilizes Fuzzy Logic FL to convert the linguistic judgements into numerical values for computation.