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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: 27 July 2012

Indra Gunawan and Nasser S. Fard

Multistage Interconnection Networks (MINs) are a class of network systems designed to improve communication in large‐scale parallel processing systems. These networks facilitate…

Abstract

Purpose

Multistage Interconnection Networks (MINs) are a class of network systems designed to improve communication in large‐scale parallel processing systems. These networks facilitate the communications to perform a single overall task in a parallel processing system consisting of a large number of processors that are working together. The purpose of this paper is to discuss two types of MINs: gamma networks and extra‐stage gamma networks. It is shown that a specific modification in the structure of a standard gamma network will add multiple paths from a specific source to a specific destination.

Design/methodology/approach

The terminal reliability of these networks are evaluated and analyzed in terms of the number of their paths connecting a source i, i=1, 2, … , N to any terminal. Numerical examples are also given to demonstrate each network's performance.

Findings

In this paper, terminal reliability as a function of the reliability of a switching element of MINs is analyzed. Terminal reliability, generally used as a measure of robustness of a MIN, is the probability of existence of at least one fault free path between a designated pair of input (s) and output (t) terminals. The fault‐tolerance and terminal reliability capabilities as well as the reliability of these networks are evaluated. It is observed that the additional stage provides more redundant paths in the networks. Therefore, an additional stage leads to extra paths and improves the system's fault tolerance. It has been shown that in a Shuffle‐Exchange Network Systems, an addition of an extra stage leads to higher terminal reliability of that network. However, the additional stage does not necessarily improve the terminal reliability of the gamma network. The additional stage could add to the switch complexity and increase the probability of a path failure as well. Therefore, the extra‐stage gamma network has multiple paths in every source‐destination pair including the case when the tag value is 0, that is, when (s=t).

Originality/value

Other authors have not done this kind of research analysis.

Details

International Journal of Quality & Reliability Management, vol. 29 no. 7
Type: Research Article
ISSN: 0265-671X

Keywords

Article
Publication date: 6 February 2019

Soni Bisht and S.B. Singh

The purpose of this paper is to evaluate various reliability measures like reliability, expected lifetime (mean time to failure), signature reliability and compare networks based…

Abstract

Purpose

The purpose of this paper is to evaluate various reliability measures like reliability, expected lifetime (mean time to failure), signature reliability and compare networks based on the different flows.

Design/methodology/approach

The reliability characteristics of complex bridge networks have been evaluated using different algorithms with the help of universal generating function (UGF). Further, the signature reliability of the considered networks has been determined using Owen’s method.

Findings

The present paper proposes an efficient algorithm to compute the reliability indices of complex bridge networks having i.i.d. lifetime components (nodes, edges) with the help of UGF and Owen’s method. This study reveals that a slight change in the complex bridge network affects the reliability significantly. Finally, by the reliability structure function, proposed algorithms are used to find the signature and MTTF. From signature, we have determined the different failure probabilities corresponding to edges of the network.

Originality/value

In this work, we have evaluated reliability characteristics and signature reliability of the complex bridge networks using UGF method and Owen’s method respectively unlike done in the past.

Details

International Journal of Quality & Reliability Management, vol. 36 no. 2
Type: Research Article
ISSN: 0265-671X

Keywords

Article
Publication date: 19 January 2022

Shoufeng Ji, Yaoting Xue and Guosong Zhu

The Physical Internet (PI) application in a supply chain is explored by automakers to achieve a digital supply chain to challenge timely delivery while maintaining high customised…

153

Abstract

Purpose

The Physical Internet (PI) application in a supply chain is explored by automakers to achieve a digital supply chain to challenge timely delivery while maintaining high customised production at the lowest operating cost.

Design/methodology/approach

A bi-objective mixed integer model is formulated, where production is performed in multistage manufacturing systems (MMS) and then delivered in a two-level distribution system. Next, a hybrid iterative method algorithm is developed to solve the practical-scale problem within an admissible time. Finally, PI's benefits on production and supply chain operation are discussed through extensive computational experiments in different supply chain configurations.

Findings

Three significant findings are obtained. First, PI can achieve a comparable or better service level, while the cost is always lower. Second, PI can improve the utilisation of production and transportation resources. Third, with a more complex supply chain and a higher production cost or truck fixed cost, PI's advantages over traditional supply chain become more vigorous, but the increase in orders will weaken it.

Practical implications

The auto enterprise should adopt a PI-enabled supply chain (PI-SC), especially with the increase of network complexity and specific cost factors.

Social implications

Importance should be attached to the PI-SC to make customers better involved in the supply chain.

Originality/value

First, the application of PI in the existing plant is described. Second, MMS production with multi-mode transportation is jointly scheduled. Third, the decision support of the PI-SC is provided for auto enterprises.

Article
Publication date: 1 April 2003

Georgios I. Zekos

Aim of the present monograph is the economic analysis of the role of MNEs regarding globalisation and digital economy and in parallel there is a reference and examination of some…

86938

Abstract

Aim of the present monograph is the economic analysis of the role of MNEs regarding globalisation and digital economy and in parallel there is a reference and examination of some legal aspects concerning MNEs, cyberspace and e‐commerce as the means of expression of the digital economy. The whole effort of the author is focused on the examination of various aspects of MNEs and their impact upon globalisation and vice versa and how and if we are moving towards a global digital economy.

Details

Managerial Law, vol. 45 no. 1/2
Type: Research Article
ISSN: 0309-0558

Keywords

Open Access
Article
Publication date: 4 November 2022

Bianca Caiazzo, Teresa Murino, Alberto Petrillo, Gianluca Piccirillo and Stefania Santini

This work aims at proposing a novel Internet of Things (IoT)-based and cloud-assisted monitoring architecture for smart manufacturing systems able to evaluate their overall status…

1899

Abstract

Purpose

This work aims at proposing a novel Internet of Things (IoT)-based and cloud-assisted monitoring architecture for smart manufacturing systems able to evaluate their overall status and detect eventual anomalies occurring into the production. A novel artificial intelligence (AI) based technique, able to identify the specific anomalous event and the related risk classification for possible intervention, is hence proposed.

Design/methodology/approach

The proposed solution is a five-layer scalable and modular platform in Industry 5.0 perspective, where the crucial layer is the Cloud Cyber one. This embeds a novel anomaly detection solution, designed by leveraging control charts, autoencoders (AE) long short-term memory (LSTM) and Fuzzy Inference System (FIS). The proper combination of these methods allows, not only detecting the products defects, but also recognizing their causalities.

Findings

The proposed architecture, experimentally validated on a manufacturing system involved into the production of a solar thermal high-vacuum flat panel, provides to human operators information about anomalous events, where they occur, and crucial information about their risk levels.

Practical implications

Thanks to the abnormal risk panel; human operators and business managers are able, not only of remotely visualizing the real-time status of each production parameter, but also to properly face with the eventual anomalous events, only when necessary. This is especially relevant in an emergency situation, such as the COVID-19 pandemic.

Originality/value

The monitoring platform is one of the first attempts in leading modern manufacturing systems toward the Industry 5.0 concept. Indeed, it combines human strengths, IoT technology on machines, cloud-based solutions with AI and zero detect manufacturing strategies in a unified framework so to detect causalities in complex dynamic systems by enabling the possibility of products’ waste avoidance.

Details

Journal of Manufacturing Technology Management, vol. 34 no. 4
Type: Research Article
ISSN: 1741-038X

Keywords

Article
Publication date: 28 June 2022

Johannes W. Veile

The purpose of the study is to shed light on how to implement Industry 4.0 effectively across companies in buyer–supplier relationships.

Abstract

Purpose

The purpose of the study is to shed light on how to implement Industry 4.0 effectively across companies in buyer–supplier relationships.

Design/methodology/approach

The study follows an exploratory research design and analyzes qualitative empirical data of eight case companies from the German automotive industry. The data are inductively categorized to uncover patterns and structures in a qualitative content analysis, whereupon a deeper data structure is developed.

Findings

The research reveals that a comprehensive implementation approach is required to pave the way for digitalized and interconnected supply chains. Several challenges occur during the implementation, such as system heterogeneity and resource scarcity. Prerequisites and fundamentals for a successful implementation include a vision and strategy, management involvement, and sufficient resources. Lastly, indications on how to conduct the implementations were found.

Research limitations/implications

The study is based on an exploratory methodology, analyzing data from the German automotive industry. The methodology entails some limitations, and caution must be given when transferring the results to different industries and national contexts. Future studies could complement the findings by studying different contexts and including further supply chain levels.

Practical implications

Managers and practitioners can study the recurring themes in the implementation approaches and the best practices and subsequently learn from the experiences. This knowledge could aid to shape the strategy of companies accordingly.

Originality/value

The study empirically sheds light on the Industry 4.0 implementation approach across companies in buyer–supplier relationships and helps to understand the success factors and underlying mechanisms.

Details

The International Journal of Logistics Management, vol. 34 no. 5
Type: Research Article
ISSN: 0957-4093

Keywords

Open Access
Article
Publication date: 19 April 2022

Liwei Ju, Zhe Yin, Qingqing Zhou, Li Liu, Yushu Pan and Zhongfu Tan

This study aims to form a new concept of power-to-gas-based virtual power plant (GVPP) and propose a low-carbon economic scheduling optimization model for GVPP considering carbon…

Abstract

Purpose

This study aims to form a new concept of power-to-gas-based virtual power plant (GVPP) and propose a low-carbon economic scheduling optimization model for GVPP considering carbon emission trading.

Design/methodology/approach

In view of the strong uncertainty of wind power and photovoltaic power generation in GVPP, the information gap decision theory (IGDT) is used to measure the uncertainty tolerance threshold under different expected target deviations of the decision-makers. To verify the feasibility and effectiveness of the proposed model, nine-node energy hub was selected as the simulation system.

Findings

GVPP can coordinate and optimize the output of electricity-to-gas and gas turbines according to the difference in gas and electricity prices in the electricity market and the natural gas market at different times. The IGDT method can be used to describe the impact of wind and solar uncertainty in GVPP. Carbon emission rights trading can increase the operating space of power to gas (P2G) and reduce the operating cost of GVPP.

Research limitations/implications

This study considers the electrical conversion and spatio-temporal calming characteristics of P2G, integrates it with VPP into GVPP and uses the IGDT method to describe the impact of wind and solar uncertainty and then proposes a GVPP near-zero carbon random scheduling optimization model based on IGDT.

Originality/value

This study designed a novel structure of the GVPP integrating P2G, gas storage device into the VPP and proposed a basic near-zero carbon scheduling optimization model for GVPP under the optimization goal of minimizing operating costs. At last, this study constructed a stochastic scheduling optimization model for GVPP.

Details

International Journal of Climate Change Strategies and Management, vol. 15 no. 2
Type: Research Article
ISSN: 1756-8692

Keywords

Article
Publication date: 13 February 2019

Hui-Ju Wang

With society’s growing environmental concern, developing a green brand identity provides cities with opportunities to enhance their competitiveness. Nevertheless, few studies have…

1619

Abstract

Purpose

With society’s growing environmental concern, developing a green brand identity provides cities with opportunities to enhance their competitiveness. Nevertheless, few studies have explored green city branding and specifically considered the diverse perceptions of multiple stakeholders. Accordingly, this study aims to explore green city branding from the perceptions of multiple stakeholders.

Design/methodology/approach

Based on associative network theory, the study uses brand concept maps and network analysis approaches to construct and analyze the content and structure of mental models among local residents and foreign tourists for a green city brand. This study further seeks empirical support for the findings via a survey, using the sample case of Yilan County in Taiwan.

Findings

The results of this study reveal that foreign tourists possess a more diverse and heterogeneous brand perception than local residents. Additionally, the study uncovers significant green city brand associations regarding their influences on the behavioral decisions of local residents and foreign tourists.

Originality/value

This research is the first attempt to advance the knowledge of green city branding by empirically exploring the green city brand perceptions of multiple stakeholders based on associative network theory. The results provide brand researchers with different analytical perspectives on the existing knowledge about city brand perceptions and offer strategic information for city managers.

Details

Journal of Product & Brand Management, vol. 28 no. 3
Type: Research Article
ISSN: 1061-0421

Keywords

Article
Publication date: 4 August 2021

Subburaman Bhuvaneshwari and Sundharajan Kanthamani

This study aims to present two stage pseudomorphic high electron mobility transistor-based low noise amplifier (LNA) designed using low temperature co-fire ceramic (LTCC…

Abstract

Purpose

This study aims to present two stage pseudomorphic high electron mobility transistor-based low noise amplifier (LNA) designed using low temperature co-fire ceramic (LTCC) technique for ultra-high frequency (UHF) band. The LNA operates in the frequency range of (400∼500) MHz which is suitable for wireless communication applications.

Design/methodology/approach

This LNA uses resistive capacitive (RC) feedback in the first stage to have wide bandwidth and interstage network for gain enhancement. By using external RC feedback, stability is improved and noise matching in the input stage is isolated by decoupling inductor. The excellent performance parameters including gain, noise figure (NF), wideband and linearity are attained without affecting the power consumption, compactness and cost of the proposed design.

Findings

Simulation is carried out using advanced design software and the result shows that gain of 33.7 dB, NF 0.416 dB and 1 dB compression point (P1dB) of 18.59 dBm are achieved with a supply voltage of 2.5 V. The return loss of input and output are −19.3 dB and −10.5 dB, respectively. From the above aforementioned parameters, it is confirmed that the proposed LNA is a promising candidate for receivers where high gain and very low NF are always demandable with good linearity for applications operating in the UHF band.

Originality/value

The innovation of the proposed LNA is that the concurrent attainment of high gain, low NF, wideband, optimum input matching, good stability by RC feedback and interstage network using LTCC technique to achieve robustness, low cost and compactness to prove the applicability of design for wireless applications.

Details

Circuit World, vol. 48 no. 4
Type: Research Article
ISSN: 0305-6120

Keywords

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