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Article
Publication date: 1 June 1979

John T. Mentzer and Stephen C. Cosmas

The application of computer modelling and simulation to logistics networks has been quite common. The primary reason is that logistical systems possess inherent…

Abstract

The application of computer modelling and simulation to logistics networks has been quite common. The primary reason is that logistical systems possess inherent characteristics which are compatible to computer modelling and simulation. One such technique which provides modelling and simulation capabilities and has yet to be applied to logistical networks is GERT (Graphical Evaluation and Review Technique). This article discusses the application of GERT to the area of logistics. The first section presents a brief background on the applicability of computer simulation in logistics. The second section presents an overview of the GERT simulation model. The third section describes an application of the GERT model to a logistics problem. Finally, the fourth section discusses areas of potential research in logistics utilising GERT.

Details

International Journal of Physical Distribution & Materials Management, vol. 10 no. 1
Type: Research Article
ISSN: 0269-8218

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Article
Publication date: 3 March 2021

Shuli Yan, Xiangyan Zeng, Pingping Xiong and Na Zhang

In recent years, online public opinion reversal incidents have been occurring frequently, which has increased the complexity of the evolution of online public opinion, and…

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Abstract

Purpose

In recent years, online public opinion reversal incidents have been occurring frequently, which has increased the complexity of the evolution of online public opinion, and they have become a difficult issue for public opinion management and control. It is of great significance to explore the regularity of online public opinion reversal.

Design/methodology/approach

Combined with the grey characteristics of online public opinion information, a grey graphical evaluation review technique (G-GERT) network model is constructed based on kernel and grey degree, and the frequency, probability and time of online public opinion reversal nodes are calculated using C-marking method and Z-marking method.

Findings

Throughout the online public opinion reversal events, there are all repeated outbreak nodes occurring, so the authors regard the repeated occurrence of outbreak nodes as reversal. According to the average frequency, probability and time of repeated outbreak nodes in the G-GERT network model, the authors predict the corresponding key information of reversal. It can simulate the evolution process of public opinion events accurately.

Originality/value

The G-GERT network model based on kernel and grey degree reveals the regulation of public opinion reversal, predicts the frequency, probability and time of reversal nodes, which are the most concerned and difficult issues for decision-makers. The model provides the decision basis and reference for government decision-making departments.

Details

Grey Systems: Theory and Application, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2043-9377

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Article
Publication date: 29 July 2014

Ruiting Xu, Zhigeng Fang and Jinyu Sun

– The purpose of this paper is to find out a scientific method to evaluate quality of complex products, whose quality is different from general products.

Abstract

Purpose

The purpose of this paper is to find out a scientific method to evaluate quality of complex products, whose quality is different from general products.

Design/methodology/approach

Based on interval grey number theory, reliability analysis method and stochastic network theory, authors have established grey success tree analysis-graph evaluation and review technique (GSTA-GERT) model in this paper.

Findings

Comparing complex products and general products, authors have found that complex products have two characters, i.e. quality of manufacture and quality of service. Furthermore, this paper has proved the GSTA-GERT model is a scientific and reasonable approach to estimate quality of complex products from the sight of manufacture-service network.

Originality/value

This paper has established GSTA-GERT model, which surmounts the defect of traditional estimation method, such as lacking logic analysis in the method of analytic hierarchy process.

Details

Grey Systems: Theory and Application, vol. 4 no. 2
Type: Research Article
ISSN: 2043-9377

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Article
Publication date: 2 January 2018

Soumen Kumar Roy, A.K. Sarkar and Biswajit Mahanty

The purpose of this paper is to study the effect of a critical subsystem development indigenously on the outcome of an Indian defence R&D project. Indigenous development…

Abstract

Purpose

The purpose of this paper is to study the effect of a critical subsystem development indigenously on the outcome of an Indian defence R&D project. Indigenous development of the critical subsystem requires the development of a number of technologies; hence the study is taken up for indigenously development of critical subsystem.

Design/methodology/approach

A simulation-based approach is used in this paper for studying the effect of indigenization decisions. A defence R&D project with the critical subsystems is modeled in Graphical Evolution and Review Technique (GERT) networks, and simulated in Arena simulation software using discrete event simulation model. The simulation model is thereafter experimented with decision options for the critical subsystem. Data were collected from the project management office (PMO) of short range homing guided missile (SRHGM) for this simulation study.

Findings

It has been found in this case that timely development of technology plays a key role in the Indian defence R&D projects. While indigenization of critical components reduces cost of development, the trade-off lies in much increased project development time. It is imperative that project teams should identify critical components early and work out appropriate strategies of indigenous development to avoid time overrun of the projects.

Research limitations/implications

The accuracy of results of the study could perhaps be affected on account of the extent of data forthcoming from the PMO. However, GERT framework presented in this paper is realistically derived from the practices used in the SRHGM project.

Originality/value

The study would help the project teams to identify critical subsystems early and work out appropriate strategies of indigenous development to avoid time overrun of the projects. This study would also make the project as well as the R&D teams aware of the causes for delays and cost overruns, and assist to deliver a product meeting end-user requirements.

Details

World Journal of Science, Technology and Sustainable Development, vol. 15 no. 1
Type: Research Article
ISSN: 2042-5945

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Article
Publication date: 29 April 2014

Saurabh Agrawal, Rajesh K. Singh and Qasim Murtaza

– The purpose of this paper is to develop a model for forecasting product returns to the company for recycling in terms of quantity and time.

Abstract

Purpose

The purpose of this paper is to develop a model for forecasting product returns to the company for recycling in terms of quantity and time.

Design/methodology/approach

Graphical Evaluation and Review Technique (GERT) has been applied for developing the forecasting model for product returns. A case of Indian mobile manufacturing company is discussed for the validation of this model. Survey conducted by the company and findings from previous research were used for data collection on probabilities and product life cycle.

Findings

Product returns for their recycling are stochastic, random and uncertain. Therefore, to address the uncertainty, randomness and stochastic nature of product returns, GERT is very useful tool for forecasting product returns.

Practical implications

GERT provides the visual picture of the reverse supply chain system and helps in determining the expected time of product returns in a much easier way but it requires probabilities of different flows and product life cycle. Both factors vary over a period, so require data update time to time before implementation.

Originality/value

This model is developed by considering all possible flows of sold products from customer to their reuse, store or recycle or landfill. First time this type of real life flows have been considered and GERT has been applied for forecasting product returns. This model can be utilized by managers for better forecasting that will help them for effective reverse supply chain design.

Details

Journal of Advances in Management Research, vol. 11 no. 1
Type: Research Article
ISSN: 0972-7981

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Article
Publication date: 1 February 1993

Gauri Shankar and B.N. Mohapatra

Introduces a conditional repetitive group sampling plan. The OC and ASN functions are derived by GERT approach. The present development would be a valuable addition to the…

Abstract

Introduces a conditional repetitive group sampling plan. The OC and ASN functions are derived by GERT approach. The present development would be a valuable addition to the literature and a useful device to quality control practitioners and also to quality control engineers and plan designers in the development of further new plans.

Details

International Journal of Quality & Reliability Management, vol. 10 no. 2
Type: Research Article
ISSN: 0265-671X

Keywords

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Article
Publication date: 30 April 2021

Irem Caglayan and Yasemin Afacan

The increasing number of older passengers is resulted in a growing significance of international senior tourism industry. In today's competitive airport environments…

Abstract

Purpose

The increasing number of older passengers is resulted in a growing significance of international senior tourism industry. In today's competitive airport environments, improving the airport service performance (ASP) for older passengers is crucial to take an important place in the market. ASP design has been in the focal point of many researchers and airport stakeholders. However, the service performance evaluation regarding airport architectural design and use of older passengers have been mostly underrated.

Design/methodology/approach

The study focused on ASP evaluation of architectural building elements. The proposed simulation-based service walkthrough (SBSW) was applied in a case airport building in Istanbul. Experts performed landside passenger activities to evaluate its ASP with a given walkthrough instruction. An empathic tool, GERonTologic age simulation (GERT) suit, was used to experience the physical limitations of older passengers during the experiment.

Findings

Results showed that SBSW positively influenced experts' evaluation of ASP, where higher service problems were obtained. The GERT suit created a significant difference, where lower ASP scores and higher perceived empathy were observed within the group with the GERT suit. The study concluded that the proposed ASP criteria and SBSW could provide a useful research framework during service design of age-friendly airports.

Originality/value

The study addressed a novel area of enquiry by proposing a new set of ASP criteria for older passengers considering the airport architectural design and evaluating these criteria through a new empathic approach “SBSW”.

Details

Archnet-IJAR: International Journal of Architectural Research, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2631-6862

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Article
Publication date: 1 April 1991

Gauri Shankar, B.N. Mohapatra and S. Joseph

This article presents a new chain sampling plan for three atttibute classes where items are classified into three categories namely good, marginal and bad. Various…

Abstract

This article presents a new chain sampling plan for three atttibute classes where items are classified into three categories namely good, marginal and bad. Various performance characteristics of interest to quality control engineers and plan designers are derived through GERT approach. In order to facilitate the operation and construction of the plan, Poisson unity values have been tabulated for a useful subset of the proposed plan.

Details

International Journal of Quality & Reliability Management, vol. 8 no. 4
Type: Research Article
ISSN: 0265-671X

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Article
Publication date: 8 June 2012

Baohua Yang, Shili Fang and Jinshuai Zhao

The purpose of this paper is to attempt to realize a complete analysis at scenario deduction of unconventional incidents coupling based on the GERTS network method.

Abstract

Purpose

The purpose of this paper is to attempt to realize a complete analysis at scenario deduction of unconventional incidents coupling based on the GERTS network method.

Design/methodology/approach

Starting from the manifestation of coupling objects, three types of emergency coupling are analyzed according to different rules, which are “events‐events” coupling, “event‐factors” coupling and “factors‐factors” coupling. Then the coupling mechanism for emergency is focused on analyzing, and the concepts of three types of coupling are put forward, at the same time, three quantitative models for coupling mechanisms are present. Also, a case was discussed to verify the analysis of coupling mechanism of emergency.

Findings

According to the types of factors rules, the classes of coupling of emergency have been divided into three types. The coupling mechanism of emergency can be used to describe the novel coupling models.

Practical implications

This research provides the method for coupling analysis in the scenario of unconventional incidents and guides the emergency managers to develop contingency strategies.

Originality/value

The paper succeeds in constructing a novel coupling model for emergency, and it could provide an effective tool for a quantitative study on unconventional incidents coupling.

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Article
Publication date: 10 June 2020

Steve Lambert

The purpose of this viewpoint paper is to explore middle leaders' ability to recognise emotions in the context of workplace research, and to propose measures that might…

Abstract

Purpose

The purpose of this viewpoint paper is to explore middle leaders' ability to recognise emotions in the context of workplace research, and to propose measures that might support them in their role.

Design/methodology/approach

This paper combines a contemporary literature review with reflections from practice to develop more nuanced understandings of middle leadership. This paper applied the Geneva Emotional Recognition Test (GERT) to explore the level of emotional recognition of 86 individuals (teachers to headteachers (equivalent to school principals)).

Findings

The preliminary findings suggest that teachers and headteachers have higher levels of emotional recognition than middle and senior leaders. This paper subsequently argues that the task-orientated nature middle leadership compounds an individual's ability to engage effectively in relationship-orientated tasks. This explains why middle leaders scored lower on the GERT assessment. This is further inhibited by the anti-correlation in the brain's ability to deal with the task-positive network (TDM) and default mode network (DMN) processing functions where individuals operate in one neural mode for long periods.

Research limitations/implications

The viewpoint paper proposes a number of implications for middle leaders and suggests that middle leaders should proactively seek out opportunities to be engaged in activities that support the DMN function of the brain and subsequently the relationship-orientated aspects of leadership, for example, coaching other staff members. However, it has to be recognised that the sample size is small and further work is needed before any generalisations can be made.

Originality/value

This paper offers a contemporary review of the role of middle leaders underpinned by a preliminary study into individuals' ability to recognise emotions.

Details

Journal of Work-Applied Management, vol. 12 no. 2
Type: Research Article
ISSN: 2205-2062

Keywords

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