Search results

Two non‐linear finite element programs have been restructured by using vectorization techniques in order to run efficiently on the Cray X‐MP/416. One of them has also been multi‐tasked to take advantage of the four processors of the machine. The techniques used in restructuring the software are discussed, and it is shown that each program must be treated individually. The resulting speed enhancements are shown to be program dependent, with a speed‐up of approximately 20 being achieved with one of the programs.

The purpose of this study is to identify organizational cultural factors and overarching themes on emergency management evident across the Facebook page of an emergency management organization. This study also aims to understand the dimensions of social capital that influence the reputation of emergency management organization using the lens of organizational culture.

The organizational cultural factors defined in the literature were used to classify content posted by the organization during a six-month period. The posts were read and analyzed thematically to determine the overarching themes evident across the collected posts. The dimensions of social capital defined in the literature were used to determine its influence on the reputation of an emergency management organization.

The organizational cultural factors that emerged from the analysis are openness and future orientation without any evidence on risk-taking and flexibility. An analysis of cultural factors indicates that organizational culture facilitates knowledge exchange and knowledge combination. The key themes embedded in the organization's posts are emergency preparedness, communication devices for emergency management, coordination and admiration. The dimensions of social capital that influenced the reputation of emergency management organization were group characteristics, volunteerism, generalized norms and togetherness. Though previous studies have found the influence of culture on social capital, this study extends those findings by identifying the dimensions of culture (i.e. openness and future orientation) that reflects the social capital dimensions (i.e. generalized norms and group characteristics) in an organizational setting.

This study contributes to theory on the identification of cultural factors from content posted by emergency management organizations on a public social networking site (SNS). The organization benefited in terms of its reputation through the dimensions of social capital which are group characteristics, volunteerism, generalized norms and togetherness. One of the organizational reputation dimensions that was evident in this study was moral reputation which is a contribution of this study.

Among the guiding principles of Sendai Framework for Disaster Risk Reduction, three guiding principles were evident in the posts of the emergency management organization. These principles which represent the practical implications of this study are disaster risk reduction through cooperation, inclusiveness of minority community members and implementing cost-effective and sustainable development policies for future through investment.

Previous studies have examined organizational culture in general, but to date there has been very little research into determining cultural factors that facilitate knowledge exchange and knowledge combination. This is also a unique study which identified the dimensions of social capital and organizational reputation in emergency management.

Purpose — The purpose of this paper is to seek improved solution techniques for combined boundary‐initial value problems (IVPs) associated with the time‐dependent creep deformation and rupture of engineering structures at high temperatures and hence to reconfigure a parallel iterative preconditioned conjugate gradient (PCG) solver and the DAMAGE XXX software, for 3‐D finite element creep continuum damage mechanics (CDM) analysis.Design/methodology/approach — The potential to speed up the computer numerical solution of the combined BV‐IVPs is addressed using parallel computers. Since the computational bottleneck is associated with the matrix solver, the parallelisation of a direct and an iterative solver has been studied. The creep deformation and rupture of a tension bar has been computed for a range of the number of degrees of freedom (ndf), and the performance of the two solvers is compared and assessed.Findings — The results show the superior scalability of the iterative solver compared to the direct solver, with larger speed‐ups gained by the PCG solver for higher degrees of freedom. Also, a new algorithm for the first trial solution of the PCG solver provides additional speed‐ups.Research limitations/implications — The results show that the ideal parallel speed‐up of the iterative solver of 16, relative to two processors, is achieved when using 32 processors for a mesh of ndf = 153,238. Originality/value — Techniques have been established in this paper for the parallelisation of CDM creep analysis software using an iterative equation solver. The significant computational speed‐ups achieved will enable the analysis of failures in weldments of industrial significance.

The purpose of this paper is to provide a holistic and cohesive overview of the development of GATT, Article XX; critically focussing, in particular, on whether the interpretation of the provision permits developed member states to embark on unilateral and protectionist actions.

The methodology for this paper was to assess and review the developing jurisprudence of the World Trade Organization (WTO) that relates to the use of Article XX. The paper adopts a chronological critique to analyse the development of the law; included in this is academic theory that underpins and proffers an explanation for the development.

This paper suggests that while Article XX exists as a potential target to permit unilateral action by developed nations, it does not create a guise for unilateralism and protectionism due to the interpretation afforded to the “Chapeau”.

The paper demonstrates an expansive collection of WTO jurisprudence and case authorities to illustrate the overarching interpretation of Article XX; in doing so, it allows those associated with the WTO to gain a practical overview of the holistic workings of Article XX.

Through demonstration of Article XX, and its interpretation, this paper outlines the social values and norms most likely to enjoy a privileged status to override WTO obligations. This paper also espouses what social values may develop in the future to be classified within Article XX.

This paper provides an original insight by considering holistically, rather than narrowly, the interpretation of Article XX.

This paper aims to analyse whether the World Trade Organisation (WTO) covered agreements ought to be interpreted in a manner that enables an importing country to restrict or prohibit import of goods manufactured using child labour. This question is pertinent, given the WTO-covered agreements do not explicitly mention child labour, yet there is increasing international concern for the phenomenon of child labour, evidenced through international human rights law and international labour law treaties and a push by some developed countries’ WTO Members for inclusion of a “social clause” governing child labour under the covered agreements.

This paper examines the WTO-covered agreements, current trends in interpretation of the covered agreements by panels and the Appellate Body (AB) and scholarly debate regarding connecting trade with labour standards and human rights.

This paper argues: that although inclusion of a social clause in the covered agreements is unlikely, Article XX(a) GATT, Article XX(b) GATT and Article 2.1 TBT can in certain circumstances be interpreted as to allow such restrictions on the import of goods; that no clear academic argument logically precludes connecting trade with labour standards and human rights; and that to legitimate both the WTO and the international legal system as a whole, the covered agreements, as the basis of international trade law, ought to be interpreted in a manner consistent with international labour law and international human rights law.

This paper draws upon the recent AB decision in European Commission – Seal Products, examining the AB’s interpretation of the Article XX(a) GATT “public morals” exception. This paper further seeks to provide a succinct overview of the argument surrounding WTO involvement in the issue of child labour.

The paper aims to review recent developments for analysis of deteriorating stiffened panels subjected to static and explosive forces.

The first part reviews numerical procedures developed for stiffened panels subjected to explosive forces. The structural idealization, the theoretical basis, and the merits of these methods are discussed. The second part reviews the probabilistic procedures developed for analysis of deteriorating stiffened panels. The third part reviews recent work developed in several finite element modelling philosophies for analysis of stiffened panels. The influence of various parameters affecting the structural performance, such as geometric and material imperfections, corrosion, residual stresses, etc. is discussed. The fourth part reviews hybrid procedures developed to provide approximate solutions for the designers. Numerical procedure is presented using combination of energy formulations and mathematical programming techniques to model the interaction between the box girder components.

Localized damage largely affects the performance of stiffened panels and must be accounted for in the design phase. Little emphasis was given in the published literature to developing simplified analytical models that can be used in practice to compute the residual strength of the stiffened panels under these types of loadings. Furthermore, analytical expressions are required to compute the reduction in the stiffness induced due to the structural or material defects. These expressions must be dependent on the type of damage. It must be noted that some of this damages is localized in nature and must be accounted for by using specialized functions to assess the structural defect accurately. Research work is required in this direction.

The paper provides useful resource material for the engineers in practice regarding recent techniques developed to assess damaged stiffened panels subject to static and explosive loadings. The paper reviews work developed over the past 20 years that can be used as a baseline for future developments.

Very limited literature dealt with the ultimate strength of damaged stiffened structure under static and explosive forces. No guidelines are available in current design codes to assess the damage in predicting the strength of deteriorating stiffened panels.

The purpose of this paper is to provide a design and material selection guideline for a plastic ball grid array (PBGA) package in order to improve its reliability and manufacturing ability after post mold cure.

Numerical experiments based on a three‐dimensional (3‐D) viscoelastic finite element method have been conducted to evaluate governing damage mechanisms after post mold cure (PMC) for PBGA packages. The parametric studies for the PBGA package with various molding compounds have been performed. A wide range of the modulus (1MPa∼15GPa) and the coefficient of thermal expansion (CTE) (10ppm∼300ppm) are evaluated to see feasibility of a new class of material set in the molding compound. Effects of thermo‐mechanical properties of selected molding compound on the warpage and residual stress of the PBGA are analyzed.

The present study shows that the material properties such as modulus and CTE of molding compounds play an important role in warpages and reliability of PBGA packages. After post mold cure, compressive normal stress σ_xx is observed in the silicon die, while tensile stress occurs in the rest of the PBGA package. The maximum normal stress σ_xx is observed at the center of the silicon die and decreases near the edge of the package. As the coefficient of thermal expansion of the silicon die is substantially less than that of the molding compound or substrate, the molding compound and the substrate are trying to shrink more when temperature decreases and in turn compressing the silicon chip. The molding compound with low modulus produces low stresses in the Si die and the die attach. Moreover, for the low modulus case, the CTE of molding compound does not affect the warpage of the PBGA package and the stresses in the silicon die or the die attach. However, for the high modulus case, the warpage and stresses are increased significantly by increasing the CTE of molding compound.

It is suggested that adhesion strengths of die attaches should be studied in future studies, since those affect the delamination between dies and substrates.

The findings can be used as general design guidelines for a PBGA package.

The results presented in the paper will be very useful to designers of PBGAs.

The paper deals with the rheological‐dynamical analogy in which the three‐dimensional stress‐strain relations are defined under cyclic variation of stress for Hencky’s total strain theory. In many practical visco‐elasto‐plastic problems, like as multiaxial fatigue under loading at constant stress amplitude and constant stress ratio, the load‐carrying members are subjected to proportional loading. The classical Hencky’s theory has the advantage of mathematical convenience but its disadvantage is that the deformations predicted for the volume element are independent of the loading path. The existing formulations of the constitutive models for metals are mainly based on the Prandtl‐Reuss incremental theory of elasto‐plasticity, slip theory of plasticity or continuum damage mechanics. They have been shown capable of reproducing satisfactorily most experimental results available for metallic specimens. However, from the theoretical viewpoint little has been said about how these formulations relate to realistic predicting many different inelastic and time dependent problems of two‐ or threedimensional solids, such as fatigue, discontinuous plastic deformation etc. In this paper, fundamentally new aspect of isochronous constitutive relations for Hencky’s theory, which are dependent of the each loading path, is achieved by systematically introducing RDA concept into the continuum framework. Specific inelastic and fatigue formulation of triaxial state of stress is developed and discussed within the new theoretical tool and related to von Mises plasticity..

There is growing dissatisfaction with the static, reductionist, socially insensitive and unimaginative methods used in construction management research. The present paper challenges the emerging view that methods are strictly associated with philosophies, and in particular, that quantitative methods are at odds with interpretative aspirations. It does so by providing a practical example of social network analysis, a quantitative method which is sympathetic to these aspirations. The example is set within a crisis management context, and illustrates the dangers of using qualitative or quantitative methods in isolation. The present paper concludes by questioning the association of quantitative methods with causality and the production of universal models, and argues that both quantitative and qualitative methods have a role to play in understanding the complexity of people's changing social roles, positions and behaviours within construction organizations.

The purpose of this paper is to highlight the importance of independence principle of refund guarantees (RGs) and how to make the best of an arbitration clause in the guarantees so that a Korean shipbuilder, a guarantor and an export credit agency (ECA) may possibly protect themselves from buyers’ unlawful demand.

This paper firstly introduces a brief elucidation about RG and the concept of independence principle. By way of presenting factual backgrounds, legal and policy evaluation and analyses, this paper covered all issues and disputes arising out of one shipbuilding contract and the independent RG drawn from the shipbuilding contract, through in-depth cases studies of a judicial case on the matter of independence principle of RG between the beneficiary (the buyer or its assignee) and the guarantor reviewed by an English court, an arbitration case regarding whether the beneficiary (the buyer or its assignee) has any right of refund in the event of the acceptance of a repudiatory breach by the applicant (the builder) in the London Maritime Arbitrators Association, and the beneficiary (the buyer or its assignee)’s appeal to an English court against the award and a judicial case reviewing whether the guarantor has right of reimbursement in accordance with the terms of the export bond insurance with the Korean ECA.

While most RGs, in practice, are drawn as an independent guarantee which is payable on call without any evidence of default, there is another payment scheme in RGs, such as payment upon the submission of an arbitral award which may enhance the application of RGs in shipbuilding contracts. The paper suggested that under these circumstances, Korean builders may opt to make their shipbuilding contract be governed by Korean laws, with the Korean Commercial Arbitration Board as a competent arbitral jurisdiction and forum as far as possible.

This paper proposes prudent approaches and considerations in the issuance and application of RGs which are independent from shipbuilding contracts. The hope is to increase awareness in the utility of arbitration system as well as for fiduciary Korean banks and ECAs to play a more pivotal role in guiding shipbuilding industry stakeholders.