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1 – 10 of over 43000Nam‐Hyeon Kim, Dong‐Won Sohn and James A. Wall
The first of two exploratory studies investigated the conflict management approaches of 310 South Korean leaders. Each recalled the most recent dispute they had encountered either…
Abstract
The first of two exploratory studies investigated the conflict management approaches of 310 South Korean leaders. Each recalled the most recent dispute they had encountered either between two subordinates or between a subordinate and a person outside the workgroup (i.e., an outsider). Subsequently, they reported the techniques used to manage the dispute. As predicted, the leaders were more assertive in managing subordinate‐subordinate conflicts. Unexpectedly, they also pressed their own subordinates quite forcefully in the subordinate‐outsider disputes. The second study investigated subordinates' interventions in their leaders’ disputes. In these conflicts, subordinates adopted a low‐key shuttle diplomacy; meeting separately with the parties, listening to their opinions, transmitting these to the other side, and calling for each side's empathy and understanding.
Mohammad Ghalambaz, S.A.M. Mehryan, Muneer A. Ismael, Ali Chamkha and D. Wen
The purpose of the present paper is to model a cavity, which is equally divided vertically by a thin, flexible membrane. The membranes are inevitable components of many…
Abstract
Purpose
The purpose of the present paper is to model a cavity, which is equally divided vertically by a thin, flexible membrane. The membranes are inevitable components of many engineering devices such as distillation systems and fuel cells. In the present study, a cavity which is equally divided vertically by a thin, flexible membrane is model using the fluid–structure interaction (FSI) associated with a moving grid approach.
Design/methodology/approach
The cavity is differentially heated by a sinusoidal time-varying temperature on the left vertical wall, while the right vertical wall is cooled isothermally. There is no thermal diffusion from the upper and lower boundaries. The finite-element Galerkin technique with the aid of an arbitrary Lagrangian–Eulerian procedure is followed in the numerical procedure. The governing equations are transformed into non-dimensional forms to generalize the solution.
Findings
The effects of four pertinent parameters are investigated, i.e., Rayleigh number (104 = Ra = 107), elasticity modulus (5 × 1012 = ET = 1016), Prandtl number (0.7 = Pr = 200) and temperature oscillation frequency (2p = f = 240p). The outcomes show that the temperature frequency does not induce a notable effect on the mean values of the Nusselt number and the deformation of the flexible membrane. The convective heat transfer and the stretching of the thin, flexible membrane become higher with a fluid of a higher Prandtl number or with a partition of a lower elasticity modulus.
Originality/value
The authors believe that the modeling of natural convection and heat transfer in a cavity with the deformable membrane and oscillating wall heating is a new subject and the results have not been published elsewhere.
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Rainald Löhner, Lingquan Li, Orlando Antonio Soto and Joseph David Baum
This study aims to evaluate blast loads on and the response of submerged structures.
Abstract
Purpose
This study aims to evaluate blast loads on and the response of submerged structures.
Design/methodology/approach
An arbitrary Lagrangian–Eulerian method is developed to model fluid–structure interaction (FSI) problems of close-in underwater explosions (UNDEX). The “fluid” part provides the loads for the structure considers air, water and high explosive materials. The spatial discretization for the fluid domain is performed with a second-order vertex-based finite volume scheme with a tangent of hyperbola interface capturing technique. The temporal discretization is based on explicit Runge–Kutta methods. The structure is described by a large-deformation Lagrangian formulation and discretized via finite elements. First, one-dimensional test cases are given to show that the numerical method is free of mesh movement effects. Thereafter, three-dimensional FSI problems of close-in UNDEX are studied. Finally, the computation of UNDEX near a ship compartment is performed.
Findings
The difference in the flow mechanisms between rigid targets and deforming targets is quantified and evaluated.
Research limitations/implications
Cavitation is modeled only approximately and may require further refinement/modeling.
Practical implications
The results demonstrate that the proposed numerical method is accurate, robust and versatile for practical use.
Social implications
Better design of naval infrastructure [such as bridges, ports, etc.].
Originality/value
To the best of the authors’ knowledge, this study has been conducted for the first time.
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Rhodri L.T. Bevan, Roland W. Lewis and Perumal Nithiarasu
The purpose of this paper is to numerically model forced convection heat transfer within a patient‐specific carotid bifurcation and to examine the relationship between the…
Abstract
Purpose
The purpose of this paper is to numerically model forced convection heat transfer within a patient‐specific carotid bifurcation and to examine the relationship between the temperature and wall shear stress.
Design/methodology/approach
The procedure employs a parallel, fully explicit (matrix free) characteristic based split scheme for the solution of incompressible Navier‐Stokes equations.
Findings
The arterial wall temperature, rather than the blood temperature dominates the regions of low wall shear stress and high oscillating shear stress. Additionally, negligible temperature gradient was detected proximal to the arterial wall in this locality.
Originality/value
The presented results demonstrate a possible mechanism for cold air temperature to influence the atherosclerotic plaque region proximal to the stenosis. The proposed patient‐specific heat transfer analysis also provides a starting point for the investigation of the influence of induced hypothermia on carotid plaque and its stability.
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Mo‐Hwa Wang and Klaus‐Jürgen Bathe
The primitive variable finite element formulation is used in a straightforward manner to solve for two turbulent pipe flows. The solution is based on the use of the Nikuradse—van…
Abstract
The primitive variable finite element formulation is used in a straightforward manner to solve for two turbulent pipe flows. The solution is based on the use of the Nikuradse—van Driest mixing‐length formula but no special wall element is employed. The finite element solutions are compared with experimental results.
R Lohner, Muhammad Baqui, Eberhard Haug and Britto Muhamad
The purpose of this paper is to develop a first-principles model for the simulation of pedestrian flows and crowd dynamics capable of computing the movement of a million…
Abstract
Purpose
The purpose of this paper is to develop a first-principles model for the simulation of pedestrian flows and crowd dynamics capable of computing the movement of a million pedestrians in real-time in order to assess the potential safety hazards and operational performance at events where many individuals are gathered. Examples of such situations are sport and music events, cinemas and theatres, museums, conference centres, places of pilgrimage and worship, street demonstrations, emergency evacuation during natural disasters.
Design/methodology/approach
The model is based on a series of forces, such as: will forces (the desire to reach a place at a certain time), pedestrian collision avoidance forces, obstacle/wall avoidance forces; pedestrian contact forces, and obstacle/wall contact forces. In order to allow for general geometries a so-called background triangulation is used to carry all geographic information. At any given time the location of any given pedestrian is updated on this mesh. The model has been validated qualitatively and quantitavely on repeated occasions. The code has been ported to shared and distributed memory parallel machines.
Findings
The results obtained show that the stated aim of computing the movement of a million pedestrians in real-time has been achieved. This is an important milestone, as it enables faster-than-real-time simulations of large crowds (stadiums, airports, train and bus stations, concerts) as well as evacuation simulations for whole cities.
Research limitations/implications
All models are wrong, but some are useful. The same applies to any modelling of pedestrians. Pedestrians are not machines, so stochastic runs will be required in the future in order to obtain statistically relevant ensembles.
Practical implications
This opens the way to link real-time data gathering of crowds (i.e. via cameras) with predictive calculations done faster than real-time, so that security personnel can be alerted to potential future problems during large-scale events.
Social implications
This will allow much better predictions for large-scale events, improving security and comfort.
Originality/value
This is the first time such speeds have been achieved for a micro-modelling code for pedestrians.
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James Jianxin Gong and S. Mark Young
We examine the role of financial and nonfinancial performance measures in managing revenues derived from life cycles of a type of intellectual property products − motion pictures.
Abstract
Purpose
We examine the role of financial and nonfinancial performance measures in managing revenues derived from life cycles of a type of intellectual property products − motion pictures.
Design/approach
Our study focuses on the first two markets in which audiences can watch a motion picture – the upstream theatrical market and the downstream home video market. We combine data collected from numerous public and proprietary sources and form a final sample of 654 motion pictures. Then we perform regression analysis on the data.
Findings
First, three measures of a movie’s performance in the theatrical market, opening box office revenue, peak rank, and weeks at the peak rank, have positive effects on subsequent revenues in the home video market. Second, the same set of performance measures also predicts the motion picture’s life span in the theatrical market. Third, when the actual life span of a motion picture in the theatrical market deviates from its predicted value, the total return on investment in the motion picture decreases.
Research limitations
We do not have data on other downstream markets related to motion pictures, such as pay-per-view and online video streaming.
Practical implications
This study suggests that the public and proprietary data can be used to inform managerial decisions regarding intellectual property product life cycles.
Originality/value
This is the first accounting study that directly examines life cycle revenues of intellectual property products. We also extend literature on revenue driver and revenue management research to the product level.
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H. Zargartalebi, M. Ghalambaz, A. Chamkha, Ioan Pop and Amir Sanati Nezhad
A numerical model of an unsteady laminar free convection flow and heat transfer is studied in a cavity that comprises a vertical flexible thin partition.
Abstract
Purpose
A numerical model of an unsteady laminar free convection flow and heat transfer is studied in a cavity that comprises a vertical flexible thin partition.
Design/methodology/approach
The left and right vertical boundaries are isothermal, while the horizontal boundaries are insulated. Moreover, the thin partition, placed in the geometric centerline of the enclosure, is considered to be hyper elastic and diathermal. Galerkin finite-element methods, the system of partial differential equations along with the appropriate boundary conditions are transformed to a weak form through the fluid-structure interaction and solved numerically.
Findings
The heat transfer characteristics of the enclosure with rigid and flexible partitions are compared. The effect of Rayleigh number and Young’s modulus on the maximum nondimensional stress and final deformed shape of the membrane is addressed.
Originality/value
Incorporation of vertical thin flexible membrane in middle of a cavity has numerous industrial applications, and it could noticeably affect the heat and mass transfer in the enclosure.
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The purpose of this study is to quantify the energy heating performance of apartment buildings in Kosovo built after 2003 and compare it against the energy heating performance of…
Abstract
Purpose
The purpose of this study is to quantify the energy heating performance of apartment buildings in Kosovo built after 2003 and compare it against the energy heating performance of buildings in member states of EU and selected European countries.
Design/methodology/approach
This paper takes a case study approach focussed on the assessment of the heating energy performance of the building. This approach facilitated a detailed calculation of the selected materials’ energy performance used in a representative building structure in Kosovo comparing with passive buildings standard and energy heating performance of buildings in member states of EU and selected European countries.
Findings
Results of quantitative research find that the energy heating performance of apartment buildings in Kosovo built after 2003 is far higher than that of passive buildings standard and is better than the average annual energy heating performance of apartment buildings in member states of the EU and selected European countries.
Research limitations/implications
The research provides new knowledge regarding energy heating performance in new residential buildings in Kosovo and compares the findings with earlier research and energy consumption in other selected European countries. The research provides great benefits for researchers and practitioners working in the field of energy management as it compares the energy performance of residential buildings across Europe.
Originality/value
This paper provides a perspective on investigating the energy performance of a building structure of a residential apartment building in Prishtina, Kosovo. By unveiling the level of energy consumption of a residential apartment building in Kosovo representative of the new construction period can help the facility managers to acknowledge the standards they must achieve to refurbish the old building stock to achieve at least the same standard as the buildings in the new construction period.
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A bibliographical review of the finite element methods (FEMs) applied for the linear and nonlinear, static and dynamic analyses of basic structural elements from the theoretical…
Abstract
A bibliographical review of the finite element methods (FEMs) applied for the linear and nonlinear, static and dynamic analyses of basic structural elements from the theoretical as well as practical points of view is given. The bibliography at the end of the paper contains 1,726 references to papers, conference proceedings and theses/dissertations dealing with the analysis of beams, columns, rods, bars, cables, discs, blades, shafts, membranes, plates and shells that were published in 1996‐1999.
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