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Article
Publication date: 1 December 2004

George K. Stylios

Examines the tenth published year of the ITCRR. Runs the whole gamut of textile innovation, research and testing, some of which investigates hitherto untouched aspects…

Abstract

Examines the tenth published year of the ITCRR. Runs the whole gamut of textile innovation, research and testing, some of which investigates hitherto untouched aspects. Subjects discussed include cotton fabric processing, asbestos substitutes, textile adjuncts to cardiovascular surgery, wet textile processes, hand evaluation, nanotechnology, thermoplastic composites, robotic ironing, protective clothing (agricultural and industrial), ecological aspects of fibre properties – to name but a few! There would appear to be no limit to the future potential for textile applications.

Details

International Journal of Clothing Science and Technology, vol. 16 no. 6
Type: Research Article
ISSN: 0955-6222

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Article
Publication date: 20 March 2017

Enrique Soriano Heras, Fernando Blaya Haro, José María de Agustín del Burgo and Manuel Enrique Islán Marcos

The purpose of this paper is to present a solution for the levelling plate of fused deposition modelling (FDM) additive manufacturing (AM) systems. This automatic…

Abstract

Purpose

The purpose of this paper is to present a solution for the levelling plate of fused deposition modelling (FDM) additive manufacturing (AM) systems. This automatic levelling system is presented as an evolution of actual systems, which uses a new ultrasound sensing system.

Design/methodology/approach

After obtaining a prototype, different tests were conducted for getting a system which solves the level plate problem and can be mounted in any FDM AM machine. Several benchmark models were obtained and compared with current equipment concepts for the validity of the product.

Findings

All tests were performed with high accuracy, enabling the production of geometries that could not have been achieved without this novel system.

Practical implications

This development will enable experienced users to set aside the problems of calibration and focus on the purpose of this type of machines, making prototypes.

Originality/value

A system architecture has been developed and integrated into an open hardware AM system, allowing real-time adjustment of the plate during each layer, thus eliminating the need of levelling the plate, allowing to achieve easier printing, and without increasing the cost significantly.

Details

Rapid Prototyping Journal, vol. 23 no. 2
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 18 May 2020

Amalina Andrade and Karen A. Smith

This paper investigates tourism distribution channels in a small island destination with capacity constraints and contributes to understanding distribution in an emerging…

Abstract

Purpose

This paper investigates tourism distribution channels in a small island destination with capacity constraints and contributes to understanding distribution in an emerging economy. Using the case of Fernando de Noronha in Brazil, the structures and factors underlying channel choice behaviour of tourism suppliers and intermediaries were investigated.

Design/methodology/approach

41 in-depth interviews were conducted with the private sector (tourism suppliers based on Fernando de Noronha and intermediaries, based on the island as well as mainland Brazil) as well as governmental organisations. A stratified purposeful sample was taken to select suppliers and data were examined based on thematic analysis.

Findings

Both direct and indirect distribution channels are used, with limited airline tickets influencing the suppliers' choice of channels in this small island and capacity-constrained destination. Many suppliers focused on relationships with destination-based ground operators. These local intermediaries are important and extremely relevant to small island destinations building an effective business network to connect the destination to geographically distant markets and intermediaries.

Research limitations/implications

Limitations include the absence of air and cruise operators as interviewees.

Originality/value

The paper provides a comprehensive representation of the structures and analysis of tourism distribution channels in fragile small island destinations, specifically, in an emerging country context. This includes emphasising previously unexplored indirect channels of cruise ship operators and supplier's associations.

Details

Journal of Hospitality and Tourism Insights, vol. 3 no. 2
Type: Research Article
ISSN: 2514-9792

Keywords

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Article
Publication date: 2 October 2018

Víctor H. Andaluz, Cristian M. Gallardo, Fernando A. Chicaiza, Christian P. Carvajal, José Morales, Giovanny Cuzco, Vicente Morales, Byron E. Vaca and Nicolay Samaniego

This paper aims to present a unified motion control scheme for quadcopters which not only solves the point stabilization and trajectory tracking problems but also the path…

Abstract

Purpose

This paper aims to present a unified motion control scheme for quadcopters which not only solves the point stabilization and trajectory tracking problems but also the path following problem.

Design/methodology/approach

The control problem is solved based on the kinematic model of the unmanned aerial vehicles (UAV). Next, a dynamic compensation controller is considered through of a quadcopter-inner-loop system to independently track four velocity commands: forward, lateral, up/downward and heading rate. Stability and robustness of the whole control system are proved through the Lyapunov’s method. To evaluate the controller’s performance, a multi-user application which allows bilateral communication between a ground station and the Phantom 3 PRO quadrotor is developed.

Findings

The performance of the proposed unified controller is shown through real experiments for the different motion control objectives: point stabilization, trajectory tracking and path following. The experiments confirm the capability of the unified controller to solve different motion problems by an adequate selection of the control references.

Originality/value

This work proposes the design of three types of motion controllers, which can be switched to comply a task in outdoor. Based on the software development kit provided by the company DJI, an application to get and send data to the UAV is developed. By means of this application, the three tasks are tested and the robustness of the controllers is proved.

Details

Assembly Automation, vol. 38 no. 5
Type: Research Article
ISSN: 0144-5154

Keywords

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Article
Publication date: 3 October 2016

Santiago Gamba-Santamaria, Oscar Fernando Jaulin-Mendez, Luis Fernando Melo-Velandia and Carlos Andrés Quicazán-Moreno

Value at risk (VaR) is a market risk measure widely used by risk managers and market regulatory authorities, and various methods are proposed in the literature for its…

Abstract

Purpose

Value at risk (VaR) is a market risk measure widely used by risk managers and market regulatory authorities, and various methods are proposed in the literature for its estimation. However, limited studies discuss its distribution or its confidence intervals. The purpose of this paper is to compare different techniques for computing such intervals to identify the scenarios under which such confidence interval techniques perform properly.

Design/methodology/approach

The methods that are included in the comparison are based on asymptotic normality, extreme value theory and subsample bootstrap. The evaluation is done by computing the coverage rates for each method through Monte Carlo simulations under certain scenarios. The scenarios consider different persistence degrees in mean and variance, sample sizes, VaR probability levels, confidence levels of the intervals and distributions of the standardized errors. Additionally, an empirical application for the stock market index returns of G7 countries is presented.

Findings

The simulation exercises show that the methods that were considered in the study are only valid for high quantiles. In particular, in terms of coverage rates, there is a good performance for VaR(99 per cent) and bad performance for VaR(95 per cent) and VaR(90 per cent). The results are confirmed by an empirical application for the stock market index returns of G7 countries.

Practical implications

The findings of the study suggest that the methods that were considered to estimate VaR confidence interval are appropriated when considering high quantiles such as VaR(99 per cent). However, using these methods for smaller quantiles, such as VaR(95 per cent) and VaR(90 per cent), is not recommended.

Originality/value

This study is the first one, as far as it is known, to identify the scenarios under which the methods for estimating the VaR confidence intervals perform properly. The findings are supported by simulation and empirical exercises.

Details

Studies in Economics and Finance, vol. 33 no. 4
Type: Research Article
ISSN: 1086-7376

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Article
Publication date: 23 September 2019

Fernando Rojas

This paper aims to propose a supply model of periodic review with joint replenishment for multi-products grouped by several variables with random and time dependence demand.

Abstract

Purpose

This paper aims to propose a supply model of periodic review with joint replenishment for multi-products grouped by several variables with random and time dependence demand.

Design/methodology/approach

The products are grouped by multivariate cluster analysis. The stochastic inventory model describes the random demand of each product, considering the temporal dependency through a generalized autoregressive moving average model. Stochastic programming for the total cost of inventory is obtained considering the expected value of the demand per unit of time.

Findings

The total costs for the products grouped with the proposed model are 6% lower than for the individual inventory policy. The expected shortage units decrease significantly in the proposed grouped model with temporary dependence. In addition, the proposal with temporary dependency has lower costs than when the independent and identically distributed demand is considered.

Originality/value

The proposed policy is exemplified with real-world data from a Chilean hospital, where the products (drugs) are segmented by grouping variables, forming clusters of drugs with homogeneous behavior within the groups and heterogeneous behavior between groups.

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Article
Publication date: 12 March 2018

Suzana Paula Gomes Fernando da Silva Lampreia, José Fernando Gomes Requeijo, José António Mendonça Dias, Valter Martins Vairinhos and Patrícia Isabel Soares Barbosa

The application of condition-based maintenance on selected equipment can allow online monitoring using fixed, half-fixed or portable sensors. The collected data not always…

Abstract

Purpose

The application of condition-based maintenance on selected equipment can allow online monitoring using fixed, half-fixed or portable sensors. The collected data not always allow a straightforward interpretation and many false alarms can happen. The paper aims to discuss these issues.

Design/methodology/approach

Statistical techniques can be used to perform early failure detection. With the application of Cumulative Sum (CUSUM) Modified Charts and the Exponentially Weighted Moving Average (EWMA) Charts, special causes of variation can be detected online and during the equipment functioning. Before applying these methods, it is important to check data for independence. When the independence condition is not verified, data should be modeled with an ARIMA (p, d, q) model. Parameters estimation is obtained using the Shewhart Traditional Charts.

Findings

With data monitoring and statistical methods, it is possible to detect any system or equipment failure trend, so that we can act at the right time to avoid catastrophic failures.

Originality/value

In this work, an electro pump condition is monitored. Through this process, an anomaly and four stages of aggravation are forced, and the CUSUM and EWMA modified control charts are applied to test an online equipment monitoring. When the detection occurs, the methodology will have rules to define the degree of intervention.

Details

Journal of Quality in Maintenance Engineering, vol. 24 no. 1
Type: Research Article
ISSN: 1355-2511

Keywords

Content available
Article
Publication date: 7 September 2020

Sandra Maria Correia Loureiro, Ricardo Godinho Bilro and Fernando José de Aires Angelino

The purpose of this paper is to review studies on the use of virtual reality (VR) and gamification to engage students in higher education for marketing issues to identify…

Abstract

Purpose

The purpose of this paper is to review studies on the use of virtual reality (VR) and gamification to engage students in higher education for marketing issues to identify the research topics, the research gaps and to prepare a future research agenda.

Design/methodology/approach

A literature review is performed based on two search terms applied to Web of Science, resulting in a final pool of 115 articles. A text-mining approach is used to conduct a full-text analysis of papers related to VR and gamification in higher education. The authors also compare the salient characteristics presented in the articles.

Findings

From this analysis, five major research topics are found and analysed, namely, teaching methodologies and education, experience and motivation, student engagement, applied theories in VR and gamification. Based on this and following the theory concept characteristics methodology framework, the paper provides directions for future research.

Originality/value

There is no comprehensive review exploring the topics, theories, constructs and methods used in prior studies concerning VR and gamification applied to higher education services based on all the articles published in well-regarded academic journals. This review seeks to provide deeper insights, to help scholars contribute to the development of this research field.

Propósito

En este documento se revisan los estudios sobre el uso de la realidad virtual (RV) y la Gamificación para involucrar a los estudiantes en la educación superior en marketing, se identifican los principales temas de investigación tratados, las lagunas de investigación y se sugiere una agenda futura de investigación.

Diseño/metodología/enfoque

Una revisión de la literatura basada en dos búsquedas en Web of Science (WOS) permitió identificar 115 artículos. La minería de textos se utilizó para realizar un análisis de texto completo de los artículos relacionados con RV y gamificación en la educación superior. Los autores también compararon las características más destacadas de los artículos.

Hallazgos

A partir de este análisis, se encuentran y analizan cinco grandes temas de investigación: metodologías de enseñanza y educación, experiencia y motivación, compromiso de los estudiantes, aplicadas a la RV y la gamificación. Basándose en esto y siguiendo el marco del TCCM, el artículo proporciona una agenda futura de investigación.

Originalidad/valor

No hay una revisión exhaustiva que explore los temas, las teorías, construcciones y métodos utilizados en estudios anteriores relativos a RV y gamificación aplicados a servicios de educación superior basados en todos los artículos publicados en revistas académicas. Esta revisión proporciona una panorámica más detallada y sugiere a los académicos nuevas líneas de trabajo para seguir desarrollando este campo de investigación.

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Article
Publication date: 10 October 2016

Cleiton Silva de Jesus and Fernando Motta Correia

The purpose of this paper is to investigate whether fiscal policy may be a complementary instrument to monetary policy in the macrostabilization process.

Abstract

Purpose

The purpose of this paper is to investigate whether fiscal policy may be a complementary instrument to monetary policy in the macrostabilization process.

Design/methodology/approach

The authors developed a dynamic system with two linear differential equations in order to verify if an active fiscal policy can be compatible with macroeconomic equilibrium in three monetary policy regimes (conservative, alternative and hybrid). The authors also use numerical simulations because it is impossible to extract analytically full conclusions from the theoretical model.

Findings

The results suggest that fiscal policy can be a useful tool for macroeconomic stabilization; the counter-cyclical role of fiscal policy is compatible with dynamic equilibrium only if the monetary authority is not lenient towards inflation; and under an active fiscal policy a hybrid monetary regime is preferable to a conservative one.

Originality/value

This paper offers a theoretical contribution to explicate the macroeconomic implications of fiscal policy.

Details

Journal of Economic Studies, vol. 43 no. 5
Type: Research Article
ISSN: 0144-3585

Keywords

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Article
Publication date: 7 August 2020

Frank Bivar Franque, Tiago Oliveira, Carlos Tam and Fernando de Oliveira Santini

This study aims to describe, synthesise and clarify the findings of published studies on individual continuance intention to use an information system (IS), considering…

Abstract

Purpose

This study aims to describe, synthesise and clarify the findings of published studies on individual continuance intention to use an information system (IS), considering the fact that the number of studies in the continuance intention context are growing exponentially and cover several different subjects.

Design/methodology/approach

The research uses meta- and weight analysis by taking 115 empirical studies from continuance intention to use an IS. The data are presented in different views using significant and non-significant relationships from all the studies. Furthermore, it uses hierarchical linear meta-analysis to analyse potential moderators that can influence continuance intention.

Findings

The results reveal that affective commitment, attitude, satisfaction, hedonic value and flow are the best predictors of continuance intention to use an IS. Sample size, individualism, uncertainty avoidance and long-term orientation moderate the relationship of perceived usefulness on continuance intention. Power distance, masculinity and indulgence moderate relationship satisfaction on continuance intention.

Practical implications

The results reveal that continuance intention to use an IS has been studied in different countries, with different cultures; therefore, IS providers should have diversified managing strategies, to ensure the satisfaction of users and long-term usage of their IS.

Originality/value

The study provides a systematic overview of the most relevant variables used in the literature, including a temporal analysis of the theoretical models, highlighting the evolution of the constructs and presents a moderation analysis.

Details

Internet Research, vol. 31 no. 1
Type: Research Article
ISSN: 1066-2243

Keywords

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