Search results

1 – 10 of over 12000
Article
Publication date: 1 March 1984

Dan M. Frangopol

The paper attempts to establish the connection between structural reliability and structural optimization for the particular case of plastic structures. Along this line, the paper…

Abstract

The paper attempts to establish the connection between structural reliability and structural optimization for the particular case of plastic structures. Along this line, the paper outlines a reliability‐based optimization approach to design plastic structures with uncertain interdependent strengths and acted on by random interdependent loads. The importance of such interdependencies, and of some of the other statistical parameters used as input data in probabilistic computations, is demonstrated by several examples of sensitivity studies on both the probability of collapse failure as well as the reliability‐based optimum solution.

Details

Engineering Computations, vol. 1 no. 3
Type: Research Article
ISSN: 0264-4401

Article
Publication date: 5 October 2012

Stephen Twum, Elaine Aspinwall and Jörg Fliege

Reliability is a major quality characteristic which has grown in importance as products/systems have become ever more sophisticated. Neglecting it could spell great losses in…

Abstract

Purpose

Reliability is a major quality characteristic which has grown in importance as products/systems have become ever more sophisticated. Neglecting it could spell great losses in terms of patronage, revenue, and even lives. The purpose of this paper is to present a multi‐criteria optimisation model and methodology for the Pareto optimal assignment of reliability to the components of a series‐parallel system in order to maximise its reliability.

Design/methodology/approach

The subsystems' reliabilities are maximised independently but simultaneously in order to maximise the overall system reliability, while a penalty function modelling cost of reliability improvement is minimised. The resultant continuous and nonlinear optimisation problem is scalarised by a convex combination of the criteria and the MATLAB Optimisation Toolbox is used to generate the solutions.

Findings

The results for an illustrative example problem extracted from the literature show that: higher reliabilities could be assigned to the components, in order to achieve or exceed target system reliability; cost increased sharply with slight improvements in the component reliabilities, and the model was stable under the weighting scheme used.

Originality/value

The novelty of this work is in: the multi‐criteria optimisation view taken of the design problem; the focus on the subsystems' reliabilities and cost as the criteria to be optimised; the use of the two aforementioned qualities for the purpose of Pareto assignment of component reliabilities in a system's design; and the use of the model and methodology in the context of series‐parallel systems.

Details

International Journal of Quality & Reliability Management, vol. 29 no. 9
Type: Research Article
ISSN: 0265-671X

Keywords

Article
Publication date: 1 February 1987

Dan M. Frangopol and Rachid Nakib

In the last twenty years, the methods for structural system reliability evaluation have evolved considerably. Since these methods are based on different assumptions, it is…

Abstract

In the last twenty years, the methods for structural system reliability evaluation have evolved considerably. Since these methods are based on different assumptions, it is necessary to evaluate their capabilities. For this reason, a research study was initiated at the University of Colorado at Boulder in order to investigate the accuracy and reliability of various methods for structural system reliability evaluation. This paper emphasizes certain important parametric studies on system reliability methods under uncertainty. The sensitivity of the accuracy of the methods to changes in both strength and load correlations is demonstrated by means of numerical examples.

Details

Engineering Computations, vol. 4 no. 2
Type: Research Article
ISSN: 0264-4401

Article
Publication date: 1 September 2005

Tomoaki Akiba, Hisashi Yamamoto and Yasuhiro Tsujimura

For the considered system, an enumeration method is applicable to evaluate the exact system reliability only for very small‐sized systems, because, when the size of system is…

Abstract

Purpose

For the considered system, an enumeration method is applicable to evaluate the exact system reliability only for very small‐sized systems, because, when the size of system is large, it takes huge execution time. Therefore, the paper provides approximate values for the system reliability as useful for calculating the reliability of large systems in a reasonable execution time.

Design/methodology/approach

The paper provides upper and lower bounds of the system reliability, and limit theorem for the reliability of our considered system in i.i.d. case.

Findings

The paper experimentally finds that the proposed upper and lower bounds are effective when component reliabilities close to one or the value of k becomes larger. Next, it concludes approximate values for approximate equation derived from the limit theorem are always smaller than lower bound through numerical experiments.

Research limitations/implications

The upper and lower bounds for the reliability of a system can be calculated by using the reliability of a small system by the same idea as previous study for two‐dimensional system.

Practical implications

Up to now some researchers studied multi‐dimensional consecutive‐k‐out‐of‐n:F systems, and showed promising applications of such multi‐dimensional models, e.g. diagnosis of a disease diagnosed by reading an X‐ray. As another examples, three‐dimensional system can be applied for the mathematical model of a three‐dimensional flash memory cell failure model, and so on.

Originality/value

The paper considers a kind of three‐dimensional k‐within‐consecutive‐r‐out‐of‐n:F system. It proposes upper and lower bounds of the system reliability and limit theorem.

Details

Journal of Quality in Maintenance Engineering, vol. 11 no. 3
Type: Research Article
ISSN: 1355-2511

Keywords

Article
Publication date: 8 May 2018

Taha Radwan

A multi-state linear k-within-(r, s)-of-(m, n): F lattice system consists of m×n components arranged in m rows and n columns. The possible states of the system and its components…

Abstract

Purpose

A multi-state linear k-within-(r, s)-of-(m, n): F lattice system consists of m×n components arranged in m rows and n columns. The possible states of the system and its components are: 0, 1, 2, …, H. According to k values, the system can be categorized into three special cases: decreasing, increasing and constant. The system reliability of decreasing and constant cases exists. The purpose of this paper is to evaluate the system reliability in increasing case with i.i.d components, where there is no any algorithm for evaluating the system reliability in this case.

Design/methodology/approach

The Boole-Bonferroni bounds were applied for evaluating the reliability of many systems. In this paper, the author reformulated the second-order Boole-Bonferroni bounds to be suitable for the evaluation of the multi-state system reliability. And the author applied these bounds for deriving the lower bound and upper bound of increasing multi-state linear k-within-(r, s)-of-(m, n): F lattice system.

Findings

An illustrated example of the proposed bounds and many numerical examples are given. The author tested these examples and concluded the cases that make the new bounds are sharper.

Practical implications

In this paper, the author considered an important and complex system, the multi-state linear k-within-(r, s)-of-(m, n): F lattice system; it is a model for many applications, for example, telecommunication, radar detection, oil pipeline, mobile communications, inspection procedures and series of microwave towers systems.

Originality/value

This paper suggests a method for the computation of the bounds of increasing multi-state linear k-within-(r,s)-of-(m,n): F lattice system. Furthermore, the author concluded that the cases that make these bounds are sharper.

Details

International Journal of Quality & Reliability Management, vol. 35 no. 5
Type: Research Article
ISSN: 0265-671X

Keywords

Article
Publication date: 1 April 2006

Rajanand Rajagopalan and C. Richard Cassady

The purpose of this paper is to develop an improved, enumerative solution procedure for solving the original selective maintenance problems. Selective maintenance refers to the…

1037

Abstract

Purpose

The purpose of this paper is to develop an improved, enumerative solution procedure for solving the original selective maintenance problems. Selective maintenance refers to the process of identifying the set of maintenance actions to perform from a desirable set of maintenance actions.

Design/methodology/approach

A series of four improvements to a previously proposed enumerative solution procedure are presented. The improvements are defined and tested sequentially on an experimental set of problem instances. The improvements are characterized relative to the achieved reduction in CPU time for a software application.

Findings

The improved enumerative procedure reduces the CPU time required to solve the selective maintenance problems by as much as 99 per cent. There is a corresponding increase in practical problem size of more than 200 per cent.

Practical implications

Almost all organizations use a variety of repairable systems to achieve their mission. Typically, these systems have to share the limited maintenance resources possessed by the organization. Therefore, an improved ability to solve selective maintenance problem is relevant to many industries.

Originality/value

The body of knowledge relative to selective maintenance continues to grow. However, this is the first study aimed at improving the capability of engineers to solve practically‐sized selective maintenance problems.

Details

Journal of Quality in Maintenance Engineering, vol. 12 no. 2
Type: Research Article
ISSN: 1355-2511

Keywords

Article
Publication date: 24 August 2021

Vipin Sharma, Abdul Q. Ansari and Rajesh Mishra

The purpose of this paper is to design a efficient layout of Multistage interconnection network which has cost effective solution with high reliability and fault-tolerence…

Abstract

Purpose

The purpose of this paper is to design a efficient layout of Multistage interconnection network which has cost effective solution with high reliability and fault-tolerence capability. For parallel computation, various multistage interconnection networks (MINs) have been discussed hitherto in the literature, however, these networks always required further improvement in reliability and fault-tolerance capability. The fault-tolerance capability of the network can be achieved by increasing the number of disjoint paths as a result the reliability of the interconnection networks is also improved.

Design/methodology/approach

This proposed design is a modification of gamma interconnection network (GIN) and three disjoint path gamma interconnection network (3-DGIN). It has a total seven number of paths for all tag values which is uniform out of these seven paths, three paths are disjoint paths which increase the fault tolerance capability by two faults. Due to the presence of more paths than the GIN and 3-DGIN, this proposed design is more reliable.

Findings

In this study, a new design layout of a MIN has been proposed which provides three disjoint paths and uniformity in terms of an equal number of paths for all source-destination (S-D) pairs. The new layout contains fewer nodes as compared to GIN and 3-DGIN. This design provides a symmetrical structure, low cost, better terminal reliability and provides an equal number of paths for all tag values (|S-D|) when compared with existing MINs of this class.

Originality/value

A new design layout of MINs has been purposed and its two terminal reliability is calculated with the help of the reliability block diagram technique.

Details

International Journal of Pervasive Computing and Communications, vol. 17 no. 4
Type: Research Article
ISSN: 1742-7371

Keywords

Article
Publication date: 1 January 1984

Mohammad Hashim

This article sets out to prove that the basic concepts and techniques of reliability engineering, which are normally applied to material products, can also be applied effectively…

1452

Abstract

This article sets out to prove that the basic concepts and techniques of reliability engineering, which are normally applied to material products, can also be applied effectively to intangible services. It deals in some detail with the power and communication industries and refers also to government.

Details

International Journal of Quality & Reliability Management, vol. 1 no. 1
Type: Research Article
ISSN: 0265-671X

Article
Publication date: 16 October 2020

Som Sekhar Bhattacharyya

The growth of the international business is a new global reality of emerging economy firms. The increasing international footprint of business firms is transpiring into firms…

Abstract

Purpose

The growth of the international business is a new global reality of emerging economy firms. The increasing international footprint of business firms is transpiring into firms being embedded in the nest of the international business landscape. corporate social responsibility (CSR) initiatives cater to stakeholders. Given this, it is imperative that International CSR (ICSR) initiatives are undertaken for meeting the expectations of international stakeholders. It is important that ICSR is both efficient and effective. The purpose of this paper is to explicate the concept of ICSR in this study.

Design/methodology/approach

This is an exploratory study and for this, a qualitative research approach is applied. Based upon the inputs from the literature a semi-structured open-ended questionnaire is prepared. Non-probabilistic purposive snowball sampling is used to identify experts on ICSR. Qualitative in-depth personal interviews are conducted. The qualitative data is collected by in-depth personal interviews with 31 Indian ICSR experts by using a semi-structured open-ended questionnaire. Data collection was stopped after reaching thematic saturation post 31 interviews. The data is thematic and relational content analysed for seeking an answer to the research questions posed.

Findings

The author for explicating ICSR developed a moderated mediation model. The developed moderated mediation model on ICSR is having nine factors, namely – firm ICSR perspective (FICSRP), ICSR practice (ICSRP), CSR planning function (ICSRPF), organisational ICSR commitment (OICSRC), organisational stakeholder inclusivity orientation (OSIO), firm international exposure (FIE), bounded rationality of ICSR practitioners (BRICSRP), ICSR management bounded reliability (ICSRMBR) and nature of ICSR footprint (NICSRF). The author found that “firm outlook”, “CSR planning plus implementation” and “CSR commitment” are the independent variables. While firm “international exposure” and “stakeholder inclusivity orientation” are the mediating variables. CSR bounded “reliability” and “rationality” are moderating variables. The “nature of ICSR” (classified as an island or mixed or extension) is the dependent variable.

Research limitations/implications

This study is set in the context of internationalisation of the emerging economy firms of India. This qualitative empirical research study developed a moderated mediation model on ICSR. There are nine factors in the model, namely, “firm outlook”, “CSR planning plus implementation” and “CSR commitment” as independent variables, firm “international exposure” and “stakeholder inclusivity orientation” as the mediating variables, CSR bounded “reliability” and “rationality” as moderating variables and the “nature of ICSR” as the dependent variable.

Practical implications

Managers engaging in planning and implementation of ICSR initiatives in various foreign countries could best upon this study findings improve the ICSR delivery. Managers in their firms could improve the “firm outlook” to enhance ICSR, undertake increased “CSR planning plus implementation” and “CSR commitment”. Managers could base upon this study results to improve the moderating conditions of ICSR that is CSR bounded “reliability” and “rationality”. Better firm managers “international exposure” and “stakeholder inclusivity orientation” will better mediate ICSR action. All these would finally help the ICSR managers to better deliver the more effective “nature of ICSR”.

Social implications

A better understanding of ICSR will help foreign managers to develop more efficient and effective foreign CSR initiatives. This will help a better quality of CSR work done in foreign countries. This will help the host country communities and society in general.

Originality/value

This study is one of the first set of studies in the context of ICSR. This qualitative empirical study is also one of the first studies to explicate ICSR through a moderated mediation model consisting of organisational variables such as “firm outlook”, “CSR planning plus implementation” and “CSR commitment” as the independent variables. The ICSR model is composed of the firm “international exposure” and “stakeholder inclusivity orientation” as the mediating variables, CSR bounded “reliability” and “rationality” as moderating variables and the “nature of ICSR” as the dependent variable.

Details

Review of International Business and Strategy, vol. 30 no. 4
Type: Research Article
ISSN: 2059-6014

Keywords

Article
Publication date: 28 June 2019

Som Sekhar Bhattacharyya

The purpose of this paper is to develop a framework on international corporate social responsibility (ICSR). This ICSR framework would help portray the nature and process of…

Abstract

Purpose

The purpose of this paper is to develop a framework on international corporate social responsibility (ICSR). This ICSR framework would help portray the nature and process of internationalization of CSR activities of a firm. Further, this review paper presents a typology on the internationalization of corporate social responsibility (CSR) activities of a firm.

Design/methodology/approach

In this conceptual review paper, the author based upon inputs from a diverse set of the extant literature on international business strategy, resource-based view, stakeholder theory, strategic planning and implementation applied logical argumentation incrementally and sequentially to develop the ICSR framework and subsequently ICSR typology (consisting of archetypes).

Findings

This conceptual review paper offers a novel and rich theoretical perspective on an integrated framework on ICSR. This expands the extant theoretical knowledge boundaries on internationalization of CSR. Further, the proposed ICSR framework not only provides insight into the process of internationalization of CSR but also on typology regarding the nature of internationalization of CSR activities of a firm.

Research limitations/implications

There are two major theoretical contributions. First, this is one of the first integrated frameworks on ICSR that encompasses perspectives from diverse literature domains such as business environment, stakeholder theory, resource-based view, bounded rationality, bounded reliability, strategy planning and strategy execution. The second major theoretical contribution is towards categorization of firm international CSR activities based on CSR characteristics and mechanisms of deployment. The author prescribed four typologies for ICSR based upon variances in CSR perspective and CSR management. This ICSR categorization or archetypes is also a theoretical contribution.

Practical implications

The International Corporate Social Responsibility (ICSR framework developed would help both strategy and CSR managers to design ICSR programs and CSR activities of a firm based on a firms’ transferable resources and capabilities, replicable organizational process and activities, strategic focus and expected organizational benefits.

Originality/value

This is the first scholarly work on developing an integrated ICSR framework and ICSR typology (read archetypes). In this review paper, a holistic but comprehensive theoretical perspective on strategy and typology of ICSR has been provided. CSR and strategy managers for the first time would have a tool to design and manage firm international CSR initiatives in an effective and efficient manner.

Details

Social Responsibility Journal, vol. 16 no. 5
Type: Research Article
ISSN: 1747-1117

Keywords

1 – 10 of over 12000