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Article
Publication date: 5 September 2018

Ramzi Lajili, Olivier Bareille, Mohamed Lamjed Bouazizi, Mohamed Ichchou and Noureddine Bouhaddi

This paper aims to propose numerical-based and experiment-based identification processes, accounting for uncertainties to identify structural parameters, in a wave…

Abstract

Purpose

This paper aims to propose numerical-based and experiment-based identification processes, accounting for uncertainties to identify structural parameters, in a wave propagation framework.

Design/methodology/approach

A variant of the inhomogeneous wave correlation (IWC) method is proposed. It consists on identifying the propagation parameters, such as the wavenumber and the wave attenuation, from the frequency response functions. The latters can be computed numerically or experimentally. The identification process is thus called numerical-based or experiment-based, respectively. The proposed variant of the IWC method is then combined with the Latin hypercube sampling method for uncertainty propagation. Stochastic processes are consequently proposed allowing more realistic identification.

Findings

The proposed variant of the IWC method permits to identify accurately the propagation parameters of isotropic and composite beams, whatever the type of the identification process in which it is included: numerical-based or experiment-based. Its efficiency is proved with respect to an analytical model and the Mc Daniel method, considered as reference. The application of the stochastic identification processes shows good agreement between simulation and experiment-based results and that all identified parameters are affected by uncertainties, except damping.

Originality/value

The proposed variant of the IWC method is an accurate alternative for structural identification on wide frequency ranges. Numerical-based identification process can reduce experiments’ cost without significant loss of accuracy. Statistical investigations of the randomness of identified parameters illustrate the robustness of identification against uncertainties.

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Article
Publication date: 27 May 2014

Grażyna Bartkowiak, Anna Dąbrowska and Anna Marszałek

People working in the hot environment are constantly exposed to the overheating, that can lead to cardiovascular disorders and as a consequence result in occupational…

Abstract

Purpose

People working in the hot environment are constantly exposed to the overheating, that can lead to cardiovascular disorders and as a consequence result in occupational diseases. The purpose of this paper is to present developed personal liquid cooling system that is able to efficiently draw excess heat from the human organism, protecting against thermal stress.

Design/methodology/approach

The paper presents study concerning the assessment of effect of the coolant temperature in the developed liquid cooling garment (LCG) on physiological parameters of the subjects (heart rate, body temperature, skin temperature) and parameters of the undergarment microclimate, as well as subjective sensations reported by volunteers exercising in hot microclimate while wearing LCG and without LCG.

Findings

Obtained results of physiological parameters measurements, as well as undergarment physical parameters and volunteers subjective sensations, proved satisfactory level of thermal stress reduction while working in the aluminized protective clothing in hot environment by the developed personal liquid cooling system for the variant with coolant temperature 19°C and the flow rate 0.9 dm3/min.

Originality/value

This paper presents a new clothing construction intended for LCG that can efficiently support human thermoregulation processes while working in the hot environment.

Details

International Journal of Clothing Science and Technology, vol. 26 no. 2
Type: Research Article
ISSN: 0955-6222

Keywords

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Article
Publication date: 1 August 2016

Xinsheng Xu, Tiequn Huang, Cheng Wang, Jun Yuan and Fanfan Zhu

Product variant design process consists of a series of asynchronous activities. These activities and the logic relations among them are important in constructing general…

Abstract

Purpose

Product variant design process consists of a series of asynchronous activities. These activities and the logic relations among them are important in constructing general logic workflow structure, which is the foundation of deriving an activity path for variant design business. Traditional process modeling approaches have not defined activities for product variant design and cannot describe the complex relations among these activities because of the lack of logic express elements. Thus, logic workflow structure modeling method is anticipated to meet the requirements of logic description and path generation in product variant design application. This paper aims to address these issues.

Design/methodology/approach

The paper identifies the variant design modes of different types of parts and defines their variant design activities. The procedure of constructing general logic workflow structure of product variant design is proposed. Simultaneously, the principles of inferring logic relations among activities are put forward based on their adjacency information and connectivity probability. A general logic workflow structure of product variant design is constructed. Based on this, activity path corresponding to a variant design business can be generated. The algorithm of generating activity path is designed as well. In addition, Boolean vectors of activity path, based on the functional contour matrix of polychromatic set theory, can be inferred, which denotes the functional character of activity path.

Findings

A general logic workflow structure for product variant design has been established, which comprises variant design activities and basic process logic nodes. The logic relations among activities can be inferred based on their in-degree/out-degree and connectivity probability. The function character of activity path can also be expressed based on the polychromatic set theory.

Originality/value

The combination of variant design activity and basic process logic node makes diverse variant design business descriptions possible in a general workflow structure. The proposed approach provides evidences for designer to plan and develop product variant design system effectively.

Details

Assembly Automation, vol. 36 no. 3
Type: Research Article
ISSN: 0144-5154

Keywords

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Article
Publication date: 2 November 2015

Afonso C.C Lemonge, Helio J.C. Barbosa and Heder S. Bernardino

– The purpose of this paper is to propose variants of an adaptive penalty scheme for steady-state genetic algorithms applied to constrained engineering optimization problems.

Abstract

Purpose

The purpose of this paper is to propose variants of an adaptive penalty scheme for steady-state genetic algorithms applied to constrained engineering optimization problems.

Design/methodology/approach

For each constraint a penalty parameter is adaptively computed along the evolution according to information extracted from the current population such as the existence of feasible individuals and the level of violation of each constraint. The adaptive penalty method (APM), as originally proposed, computes the constraint violations of the initial population, and updates the penalty coefficient of each constraint after a given number of new individuals are inserted in the population. A second variant, called sporadic APM with constraint violation accumulation, works by accumulating the constraint violations during a given insertion of new offspring into the population, updating the penalty coefficients, and fixing the penalty coefficients for the next generations. The APM with monotonic penalty coefficients is the third variation, where the penalty coefficients are calculated as in the original method, but no penalty coefficient is allowed to have its value reduced along the evolutionary process. Finally, the penalty coefficients are defined by using a weighted average between the current value of a coefficient and the new value predicted by the method. This variant is called the APM with damping.

Findings

The paper checks new variants of an APM for evolutionary algorithms; variants of an APM, for a steady-state genetic algorithm based on an APM for a generational genetic algorithm, largely used in the literature previously proposed by two co-authors of this manuscript; good performance of the proposed APM in comparison with other techniques found in the literature; innovative and general strategies to handle constraints in the field of evolutionary computation.

Research limitations/implications

The proposed algorithm has no limitations and can be applied in a large number of evolutionary algorithms used to solve constrained optimization problems.

Practical implications

The proposed algorithm can be used to solve real world problems in engineering as can be viewed in the references, presented in this manuscript, that use the original (APM) strategy. The performance of these variants is examined using benchmark problems of mechanical and structural engineering frequently discussed in the literature.

Originality/value

It is the first extended analysis of the variants of the APM submitted for possible publication in the literature, applied to real world engineering optimization problems.

Details

Engineering Computations, vol. 32 no. 8
Type: Research Article
ISSN: 0264-4401

Keywords

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Article
Publication date: 1 July 2014

Byung-Won On, Gyu Sang Choi and Soo-Mok Jung

The purpose of this paper is to collect and understand the nature of real cases of author name variants that have often appeared in bibliographic digital libraries (DLs…

Abstract

Purpose

The purpose of this paper is to collect and understand the nature of real cases of author name variants that have often appeared in bibliographic digital libraries (DLs) as a case study of the name authority control problem in DLs.

Design/methodology/approach

To find a sample of name variants across DLs (e.g. DBLP and ACM) and in a single DL (e.g. ACM), the approach is based on two bipartite matching algorithms: Maximum Weighted Bipartite Matching and Maximum Cardinality Bipartite Matching.

Findings

First, the authors validated the effectiveness and efficiency of the bipartite matching algorithms. The authors also studied the nature of real cases of author name variants that had been found across DLs (e.g. ACM, CiteSeer and DBLP) and in a single DL.

Originality/value

To the best of the authors knowledge, there is less research effort to understand the nature of author name variants shown in DLs. A thorough analysis can help focus research effort on real problems that arise when the authors perform duplicate detection methods.

Details

Program, vol. 48 no. 3
Type: Research Article
ISSN: 0033-0337

Keywords

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Article
Publication date: 18 May 2015

L. Kleerekoper, A.A.J.F. van den Dobbelsteen, G.J. Hordijk, M.J. van Dorst and C.L. Martin

Due to the predicted global temperature rise and local expansion and densification of cities, Urban Heat Islands (UHI) are likely to increase in the Netherlands. As…

Abstract

Purpose

Due to the predicted global temperature rise and local expansion and densification of cities, Urban Heat Islands (UHI) are likely to increase in the Netherlands. As spatial characteristics of a city influence its climate, urban design could be deployed to mitigate the combined effects of climate change and UHIs. Although cities are already experiencing problems during warm-weather periods, no clear spatial means or strategies are available for urban designers to alleviate heat stress. The paper aims to discuss these issues.

Design/methodology/approach

There is a lack of knowledge on cooling effects that can be achieved through urban design in Dutch neighbourhoods. In this paper, the cooling effects of various design measures are compared on the level of urban blocks and neighbourhoods, with a focus on a 1960s neighbourhood in Amsterdam-West. The cooling effects are simulated by means of the microclimate model ENVI-met, here the effects on air temperature and physiological equivalent temperature will be evaluated.

Findings

The use of green, and a higher roof albedo in particular, seem to perform well as cooling measures. Combinations of cooling measures do not necessarily result in better performance and might even counteract other cooling effects. However, combinations of measures that lead to an increase in the environmental temperature show the largest heating.

Research limitations/implications

Effects of green roofs and facades are beyond the scope of this study, though future suggestions for this research will be included.

Originality/value

The results add to the body of knowledge in the area of climate design enabling policy makers and designers to estimate the effect of simulated measures in comparable neighbourhoods and thus improve thermal comfort in outdoor spaces.

Details

Smart and Sustainable Built Environment, vol. 4 no. 1
Type: Research Article
ISSN: 2046-6099

Keywords

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Article
Publication date: 17 April 2009

Giang Trinh, John Dawes and Larry Lockshin

This study responds to the call of Fader and Hardie for more research on buyer behaviour toward stock keeping units (SKU). This paper aims to examine whether different…

Abstract

Purpose

This study responds to the call of Fader and Hardie for more research on buyer behaviour toward stock keeping units (SKU). This paper aims to examine whether different SKU‐based product variants appeal to buyers with different demographic characteristics.

Design/methodology/approach

This study examines the product variants (such as size, formulation, type) of a range of brands in six consumer goods categories. The authors calculate and compare the market share of each variant within each demographic group. If a variant has a higher market share within a specific demographic group than the overall average, this indicates segmentation at the product variant level.

Findings

The findings show that there are many differences in the market shares of product variants among different demographic groups of buyers. The largest differences are found extensively within the age and employment status variables.

Originality/value

Functionally different product variants tend to draw different demographic‐based segments of buyers, which has not been previously shown.

Details

Journal of Product & Brand Management, vol. 18 no. 2
Type: Research Article
ISSN: 1061-0421

Keywords

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Article
Publication date: 1 March 2006

Jan Holmström, Hille Korhonen, Aki Laiho and Helena Hartiala

The purpose of this article is to propose a planning process that takes into account that manufacturers of original equipment have products at different stages of the…

Abstract

Purpose

The purpose of this article is to propose a planning process that takes into account that manufacturers of original equipment have products at different stages of the product‐life cycle, and utilizes sales and inventory information collected from distributors and retailers.

Design/methodology/approach

The research paper describes the construction and testing of a planning process.

Findings

Trials in a case company indicate that supply chain responsiveness can be improved in product launches using the proposed process. Supply chain efficiency in the maturity phase can also be improved.

Research limitations/implications

The usefulness and effectiveness of the proposed process depend on the assumption that product mix changes can be modeled and point‐of‐sales and channel sell‐through data are available regularly and reliably.

Practical implications

Modeling and monitoring the variant mix on the total market level can be used to improve supply chain responsiveness to mix changes in product launches. The introduction of this planning process reduces the need for planning in the sales units.

Originality/value

The paper shows how the quality of variant forecasting for an original equipment manufacturer can be improved with access to channel visibility in the market introduction phase.

Details

Supply Chain Management: An International Journal, vol. 11 no. 2
Type: Research Article
ISSN: 1359-8546

Keywords

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Article
Publication date: 12 March 2019

Xinsheng Xu, Jing Lin, Ying Xiao, Jianzhe Yu, Qing Liu and Jie Geng

Product variant design can only be achieved after all its constituent parts have been implemented by variant design. It is necessary to plan the sequence of part variant

Abstract

Purpose

Product variant design can only be achieved after all its constituent parts have been implemented by variant design. It is necessary to plan the sequence of part variant design reasonably. The product variant design process involves a large amount of information transfer events at the dimensional level. A reasonable product variant design process needs to make full use of the information transfer characters of parts to decrease the uncertainty of product variant design process. The existing methods of researching the product variant design process mainly focus on resource constraint and activity logic. They are deficient, however, in information transfer resolution and uncertainty management. This paper aims to address these issues.

Design/methodology/approach

This paper identifies the number of dimension transfer paths and the position of dimension locating within a transfer path as being the key factors affecting the information transfer role of dimension. Information transfer utility is proposed to measure the information transfer capability of dimensions and parts. Based on these, a two-stage approach of generating the sequence of part variant design based on information transfer utility is proposed.

Findings

The uncertainty of dimension constraint network is minimal during the product variant design process when parts are implemented by variant design under the sequence generated through a two-stage method based on the information transfer utilities of parts, as does the times of parameter transferring and iteration in dimension constraint network.

Originality/value

Part variant design under the sequence of descending information transferring utilities can decrease the difficulty of implementing product variant design validly and also increase the efficiency. This suggests an innovative method to planning the product variant design process reasonably from the perspective of informatics.

Details

Assembly Automation, vol. 39 no. 1
Type: Research Article
ISSN: 0144-5154

Keywords

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Article
Publication date: 17 February 2020

Bruce H. Bader, M. Affan Badar, Suhansa Rodchua and Alister McLeod

This research brings together two streams of thought applied to decision-making: lean thinking and stakeholder theory. Both have been identified as ways to improve…

Abstract

Purpose

This research brings together two streams of thought applied to decision-making: lean thinking and stakeholder theory. Both have been identified as ways to improve organizational value. Previous studies disagree regarding whether they can work together. This study investigates if managers balance stakeholders and lean thinking in decision-making.

Design/methodology/approach

This research investigates if both lean thinking and stakeholder salience share common literature by using data mining. It surveys organizations that perceive themselves as lean and have multiple diverse stakeholders to determine whether waste and salience are considered when making decisions. An ANOVA is done to see if organization type, management level, organization size, geographic location, or lean maturity has an effect on the priority of stakeholder salience or lean thinking's waste variants when making decisions.

Findings

Findings of this research are: 1) stakeholders salience criteria are considered more often than lean thinking's waste variants in decision-making by managers as a whole and in particular by middle-level managers and senior managers. However, lean thinking's waste variants are considered as often as stakeholder salience criteria by first-line managers. 2) The ranking of stakeholder salience in making decisions is not affected by organization type, respondent position, organization size, perceived lean experience, or geographic location. The organization type, organization size, lean experience, and location do not affect the ranking of lean thinking variants either. But the ranking of lean thinking's waste variants is significantly different for first-line, middle-level, and senior managers. Middle-level managers rank lean thinking higher than that of either first-line or senior-level. Because of this, middle managers have a more balanced approach in using lean thinking and stakeholder salience than other managers. 3) Stakeholder salience criteria have a significantly higher ranking than lean thinking variants in making decisions for all organization types: manufacturing and nonmanufacturing.

Originality/Value

This research demonstrates a significant disconnect exists between lean thinking and demands of stakeholders that impacts the value of an organization, and only middle-level managers bring balance and awareness of both streams of thought. An empirical instrument has been developed to balance the stakeholder salience criteria with the lean thinking variants.

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