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1 – 10 of over 43000Abstract
Purpose
The purpose of this paper is to research the impact of hybrid series‐parallel and parallel‐series system configurations on system performances based on system reliability and to develop a configuration model to meet the requirement of reconfigurable manufacturing system (RMS).
Design/methodology/approach
Based on the criterion of system reliability, a RMS configuration model is presented – the hybrid parallel‐series model with waiting system characteristics. The configuration model is evaluated from reliability, productivity, and cost by combining system engineering theory, Boolean algebra methodology with statistical analysis theory. The model reliability has been used to ameliorate by adopting the integrated algorithm based on Shrama and Misra optimization algorithm.
Findings
The need for application of this method and model – some constraints must be limited, the hybrid parallel‐series configuration is superior and the integrated algorithm is effective to RMS system configuration.
Research limitations/implications
Cost constraints, equipment weight constraints, and function independency of equipment are main limitations.
Practical implications
The model and method have been used to ameliorate the reconfigurable automobile parts product line in SH automobile motor company of Shanghai. The operation result illustrates the validity of this configuration model and algorithm.
Originality/value
The new RMSs configuration model has been proposed. The new algorithm is proposed to ameliorate and optimize a reconfigurable product line with the integrated algorithm based on Shrama and Misra algorithm. The actual running effect is significant.
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Keywords
Michael Pitt, Fong Kok Wai and Phua Chai Teck
Design errors in an airport passenger building can be extremely costly. Failure to plan may result in configurations and systems that are inappropriate for the future. The…
Abstract
Design errors in an airport passenger building can be extremely costly. Failure to plan may result in configurations and systems that are inappropriate for the future. The performance of an optimal building configuration depends to a large extent on the kind of technology provided for the transportation of passengers and baggage. Poorly selected technology can undermine the operational efficiency of a good configuration and vice versa. With massive growth in air travel and the scale of modern passenger buildings, more reliance will be placed on transport technology to achieve acceptable walk distances and travel times. Therefore it is critical to consider in the overall design strategy how a particular building configuration and its associated technology will perform under conditions of change. Good design practice dictates that performance be assessed using multiple criteria over a broad range of possible conditions. The difficulty in predicting future conditions makes the selection of a robust system critical to the long‐term success of an airport. This paper examines the various systems available and concludes that different system combinations are appropriate for airports with different levels of passenger throughput.
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The purpose of this study is to develop new tandem configurations of erbium-doped fiber amplifier (EDFA) using all possible pump-signal-direction schemes in simulation to identify…
Abstract
Purpose
The purpose of this study is to develop new tandem configurations of erbium-doped fiber amplifier (EDFA) using all possible pump-signal-direction schemes in simulation to identify a system configuration with the best performance in the means of the highest gain with the lowest noise figure (NF) output.
Design/methodology/approach
The spatial evolution of the physical properties such as gain, NF, population density and amplified spontaneous emission along the total length of the double-stage single-pass EDFA and single-stage double-pass EDFA configurations under all possible pumping direction schemes was investigated. Giles and Desurvire method was used for the mathematical modeling of these configurations where the two level coupled system model equations was solved in MATLAB. In the simulation of the all proposed configurations, an input signal of −35 dBm at the wavelength of 1550 nm and a total of 14 mW pump power at the wavelength of 1480 nm was used for a consistent analysis.
Findings
The numerical value of the results obtained is specific to the input parameter values used in the simulations; however, configuration-wise, the EDFA systems found with the best performance are not parameter specific.
Originality/value
The results of this numerical work will help future experimental research of designing and developing ultra-efficient EDFA systems.
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Varinder Singh and P.M. Singru
– The purpose of this paper is to study the impact of restructuring in the manufacturing system at the conceptual stage using graph theoretic model.
Abstract
Purpose
The purpose of this paper is to study the impact of restructuring in the manufacturing system at the conceptual stage using graph theoretic model.
Design/methodology/approach
Some restructuring decisions are conceptualized which reflect the aim of the organization to gradually evolve the manufacturing system towards a leaner structure. This is achieved by way of defining simplified procedures so that lesser hindrance in terms of cycles of interactions is encountered. The restructuring decisions are represented by five restructured configurations of the manufacturing system, through gradual removal of appropriate interaction links. The graph theoretic models are developed for original configuration and each of the new restructured configurations and the resulting structural characterization information is used to compare the structure of restructured configurations with the original configuration. The value of the coefficient of dissimilarity of each of the new configurations with respect to the original configuration is obtained to have a quantitative estimate of the simplification that may be achieved by different contemplated restructuring decisions.
Findings
The present work shows that the restructuring decisions can be represented by different configurations in the form of schematic diagrams involving minor changes in the interaction structure among subsystems of the manufacturing system. The quantitative analysis using coefficient of dissimilarity for restructuring decisions indicated that there are varying levels of impact created by five comparable restructuring decisions considered in the study. The findings have a potential to guide the restructuring efforts by identifying a focus area that can produce greater impact of restructuring.
Research limitations/implications
The findings are valid for a particular case manufacturing organization which does not involve itself in extensive design activity. The study is based on the assumption that the schematic diagram and graph theoretic model captured all the relevant influencing factors of the manufacturing system.
Practical implications
The study provides an easy to use methodology for the practical decision makers in manufacturing industry striving to improve the performance of their organization. It can provide the analysis of restructuring decisions at the conceptual stage itself without the necessity of disturbing the normal functioning of the organization. There is a scope for identifying focus areas where the restructuring may yield comparatively greater dividends.
Originality/value
The study of restructuring by representing it in the form of changes in interactions among subsystems of a manufacturing system and investigation of the impact of such restructuring efforts at the conceptual stage using graph theoretic model has been carried out for the first time.
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Plant configuration management systems address all phases of the plant’s life cycle, from engineering design, re‐design, maintenance, to operations. However, as yet little…
Abstract
Plant configuration management systems address all phases of the plant’s life cycle, from engineering design, re‐design, maintenance, to operations. However, as yet little research has been reported on plant configuration management information systems analysis. During the past decade, the object‐oriented approach has received much attention in information systems development. This paper describes an object structure for plant configuration management systems analysis. Three major aspects of configuration management (maintenance, re‐design change, and business process) and fundamental types of objects engaged in configuration management are described. The association between these objects is then built through identifying the messages between the objects. Practical application of this framework shows that it is useful for the analysis and design of a plant configuration management information system.
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Sara Shafiee, Katrin Kristjansdottir, Lars Hvam and Cipriano Forza
This paper aims to explore the use of the knowledge management (KM) perspective for configuration projects. Configuration projects implement configurators as information…
Abstract
Purpose
This paper aims to explore the use of the knowledge management (KM) perspective for configuration projects. Configuration projects implement configurators as information technology systems that help companies manage the specification process of customised products. An effective method of retrieving and formalising knowledge for configurators is essential, because it can reduce the risk of unsuccessful implementation and the time and effort required for development. Unfortunately, no standard KM frameworks are available specifically for configuration projects. This study identifies the knowledge necessary for different phases of a configuration project (which knowledge, for what purpose and from what sources), examines how it is transformed during a configuration project (what KM activities and tools are used) and establishes how the knowledge can be documented for future maintenance and updates.
Design/methodology/approach
This paper proposes a four-step framework for making the KM process more efficient in configuration projects. The framework is based on the literature, developed in collaboration with industrial partners and tested on four configuration projects in two engineering companies. The framework is a structured KM approach designed to save time for both domain experts and the configuration team. The authors have used a qualitative exploratory design based on multiple data sources: documentation, workshops and participant observation.
Findings
The proposed framework comprises four steps: determination of the system’s scope, to establish the project’s goal based on stakeholders’ requirements and prioritise the required products and processes; knowledge acquisition, to classify the knowledge according to the desired output and identify different knowledge sources; modelling and knowledge validation; and documentation and maintenance, to ensure that the KM system can be maintained and updated in the future.
Research limitations/implications
Because the framework is tested on a limited number of cases, its generalisability may be limited. However, focusing on a few case applications allows us to assess the effectiveness of the framework in detail and in depth to identify the practical challenges of applying it. The results of the tests support the framework’s validity. Although the framework is designed mainly for engineering companies, other industries could benefit from using it as well.
Practical implications
The individual steps of the framework create a structured approach for the KM process. Thus, the approach can save both time and resources for companies, without the need for additional investment.
Originality/value
A standard framework is lacking in the literature on KM for configuration projects. This study fills that gap by developing a KM framework for configuration projects, based on KM frameworks developed for IT projects, and KM tools.
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Allard C.R. Van Riel, Jie J. Zhang, Lee Phillip McGinnis, Mohammad G. Nejad, Milos Bujisic and Paul A. Phillips
While innovative service systems may create substantial value for certain stakeholders, they often destroy value for others. This value paradox frequently leads to unsustainable…
Abstract
Purpose
While innovative service systems may create substantial value for certain stakeholders, they often destroy value for others. This value paradox frequently leads to unsustainable service systems. The purpose of this paper is to explore the use of multiple theories to pinpoint and explain these value paradoxes, build a framework allowing potentially more sustainable value configuration of service systems and develop an agenda for future research. The framework is illustrated with examples from the hospitality industry.
Design/methodology/approach
The paper draws on prevalent theories and approaches, including service-dominant logic, business modeling, transaction cost economics, stakeholder theory, configuration theory and set theory, to develop a value configuration framework.
Findings
In a service system, the configuration of resources and relationships between these resources (i.e. the set of value propositions for various stakeholders of the system) determines which stakeholders will gain and which will lose and to what extent. For that reason, insight into the range of possible service configurations – or business models – will help decision makers consider the effects on various stakeholders, and, where possible, set their priorities right and make their businesses more sustainable. The research produces a rich research agenda.
Research limitations/implications
Examples from hospitality allow an in-depth examination of a range of dynamic configurational and technological innovations, but some idiosyncratic characteristics of the context may impede the wider applicability of the conceptual framework. Future research could complement this work by studying other service sectors.
Practical implications
The paper aims to provide decision makers in the service industry with a conceptual tool to explore, diagnose and, if needed, adjust the value configuration of their service operations. In practice, this tool may help explicate the service system configuration, thus helping managers determine their organizations’ desired positioning in terms of value creation and destruction, and to choose strategic directions by adapting configurations.
Social implications
Legislation and regulations are being adapted to various new service configurations. This paper attempts to – at least conceptually – distinguish different service configurations, allowing policy makers to identify the value trade-offs between stakeholders, including society at large.
Originality/value
Previous research focused primarily on value creation by innovative services and business models. Value creation for one stakeholder, however, could lead to value destruction for another. Taking this paradox into consideration may result in more open service ecosystems that explicitly consider sustainability and value implications in multiple dimensions and for a broader group of stakeholders.
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Ponnaganti Pavani and S.N. Singh
The purpose of the paper is to find the best distributed generators (DGs) location for improving reliability and reducing power loss using distribution system reconfiguration…
Abstract
Purpose
The purpose of the paper is to find the best distributed generators (DGs) location for improving reliability and reducing power loss using distribution system reconfiguration. This is implemented in the presence of the tie-switches. It proposes a search-based algorithm for the reconfiguration problem. Individual DG placement is obtained for all system configurations, and analytical hierarchy process tool is used for finding the overall best location. This is carried out for various system loadings.
Design/methodology/approach
This paper proposes a knowledge-based search algorithm which needs the base conditions of the distribution system. A detailed analysis is carried out for finding the best DG locations from the obtained DG placements for various system configurations. Simulations are rigorously carried out with the help of programming. Results from these simulations are further given to analytical hierarchy tool for obtaining the DGs location.
Findings
The findings of the paper are the DG placement for various system loadings and various system configurations and to obtain the best DG location for any system configuration. A search-based algorithm is designed for accomplishing it.
Originality/value
The proposed method identifies the placement of distributed generation at distribution systems for reliability improvement and power loss reduction which is one of the present day needs for fulfilling the raising power consumers.
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Hare Krishna and Ranjeet Sharma
The purpose of this paper is to consider a General System Configuration (GSC), whose particular cases are all the popular system configurations. In reliability engineering one…
Abstract
Purpose
The purpose of this paper is to consider a General System Configuration (GSC), whose particular cases are all the popular system configurations. In reliability engineering one comes across various system configurations, for example, series, parallel and k‐out of‐m system models, which consist of a number of components.
Design/methodology/approach
The paper gives a general approach to express the reliability properties of the whole system in terms of component parameters. The reliability of a GSC is expressed as a polynomial of the component reliability. Lifetime data on components have been used to estimate the system reliability characteristics through classical and Bayes estimation procedures.
Findings
The paper finds that the underlying distribution is assumed to be Weibull and, in view of cost constraints, Type‐II censored information has been used.
Practical implications
The paper is useful for reliability practitioners as well as theoreticians. It provides an easy method to estimate the reliability of any system configuration.
Originality/value
Three types of estimation procedures for a general system configuration have been developed for the first time. The lifetimes of components are assumed to follow widely used Weibull distribution, whose particular case is the most popular exponential distribution.
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Product configurator is a sales and production‐planning tool that helps to transform customer requirements into bills‐of‐materials, lists of features and cost estimations. The…
Abstract
Purpose
Product configurator is a sales and production‐planning tool that helps to transform customer requirements into bills‐of‐materials, lists of features and cost estimations. The purpose of this paper is to introduce a method of how to analyse sales configuration models by using a design structure matrix (DSM) tool. By applying the DSM techniques, the sales configuration managers may sequence the product configuration questions and organize the connection to production.
Design/methodology/approach
First, the paper explains a sales configuration system structure from published academic and non‐academic works. These sources employ both theoretical and practical views on the topic of computer‐based sales expert systems. Second, the paper demonstrates an application of using DSM for configuration modelling.
Findings
The current sales configuration approaches include constraint‐based, rules‐based, and object‐oriented approaches. Product description methods vary, but the general problem remains the same: the configuration process should be designed in such a way that customer selections do not affect the previous selections. From the user point of view, answering the questions should be smooth and fast. In turn this will lead to the growing importance of building more effective product configuration models. DSM offers a systematic way to organise customer interface in sales configuration systems.
Research limitations/implications
This paper analyses how DSM could help in planning product configuration modelling. Comparison of different sequences is presented. The examples used are hypothetical, but illustrate the suitability of DSM analysis. Companies are trying to establish easily configured product models, which are fast, flexible and cost‐effective for adjustments and modifications. Use of DSM may help in the roll‐out of sales configuration projects. DSM may also be used as a quick view to represent the complexity of product configurability. The future needs for configuration tools will be focused towards product model management from the technical limitations of different data storage approaches.
Practical implications
Configurator software creates product variants, which are logical descriptions of physical products. Variants have parameters which describe the customer‐made selections. The parameter selections may have interconnections between the choices. Some selections may affect further selections and some combinations may not be allowed for incompatibility, cost or safety reasons. There are several commercial software packages available for creating product configurations. Product description methods vary, but the general problem remains the same: the configuration process should be designed in such a way that customer selections do not affect the previous selections. Answering the questions should be smooth and fast. Configuration of complex products, for instance, airplanes, may include several sub‐systems and have various loops within the quotation process. The use of DSM may help in the roll‐out of sales configuration projects. DSM may also be used as a quick view to represent the complexity of product configurability.
Originality/value
The paper helps both researchers and practitioners to obtain a clearer view on the development of sales configuration systems and the potential of systematic DSM‐based product model analysis.
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