Search results

1 – 10 of 171
To view the access options for this content please click here
Article
Publication date: 23 August 2011

Antonio Gonzalez Rodriguez, Angel Gonzalez Rodriguez and Pierluigi Rea

The paper aims to present a new mechanical scheme for a leg to be included in legged vehicles that simplifies the control actuations along the stride.

Abstract

Purpose

The paper aims to present a new mechanical scheme for a leg to be included in legged vehicles that simplifies the control actuations along the stride.

Design/methodology/approach

The scheme includes three four‐bar links grouped in two mechanisms. The first one decouples the vertical and horizontal foot movements. The second one produces a constant horizontal foot velocity when the corresponding motor is given a constant speed. A hybrid robot with wheels at the end of the hind legs has been simulated and constructed to validate the leg performance.

Findings

The gait control requires only five commands for the electronic cards to control the leg. Decoupling vertical and horizontal movements allows a more adequate selection of actuators, a reduction of energy consumption, and higher load capacity and robot velocity. Additional mechanical benefits, such as improved robustness and lower inertia, are obtained. The hind legs can also be articulated, allowing the robot to overcome an obstacle and to climb up and down stairs.

Research limitations/implications

A hybrid robot offers greater stability with respect to a legged robot. This way the lateral movement is not a concern, and therefore it has not been tested yet during the walking cycle.

Originality/value

This new scheme obtains a quasi‐Cartesian behaviour for the foot movement that drastically simplifies the control of the walking cycle. Although the decoupling between movements has already been obtained in previous configurations, these follow a pantograph structure and suffer from blocking problems when they are subject to lateral forces. These schemes were suitable for crab‐like gaits. The proposed leg moves according to a mammal‐like gait.

Details

Industrial Robot: An International Journal, vol. 38 no. 5
Type: Research Article
ISSN: 0143-991X

Keywords

To view the access options for this content please click here
Article
Publication date: 9 January 2009

Antonio Gonzalez Rodriguez, Nestor Eduardo Nava Rodriguez and Angel Gaspar Gonzalez Rodriguez

The purpose of this paper is to propose a novel actuator with adaptable compliance for robotic applications.

Abstract

Purpose

The purpose of this paper is to propose a novel actuator with adaptable compliance for robotic applications.

Design/methodology/approach

In order to achieve limb actuation similar to that of human muscles, a novel actuator with adaptable compliance is proposed. Three principal design paradigms currently exist in the development of artificial muscles that have been adopted at several research centres, universities and commercial organizations around the world. The first approach consists of using compliant actuator systems such as pneumatic actuators. The second approach undertakes the development of electroactive polymers that deform when a voltage is applied. The third approach involves electromechanical devices typically comprising an electrical actuator and an elastic element in combination. The proposed actuator extends on the third approach. It comprises an electrical DC motor in serial configuration and a novel elastic device exhibiting variable stiffness.

Findings

The novel elastic device complements the mechanical structure of the device, enabling adaptation to the dynamic effects of external forces.

Practical implications

Several applications for the actuator with adaptable compliance have been identified in the field of human‐like robotics.

Originality/value

Prototypic experimentation has successfully demonstrated the variable stiffness of the device.

Details

Industrial Robot: An International Journal, vol. 36 no. 1
Type: Research Article
ISSN: 0143-991X

Keywords

To view the access options for this content please click here
Article
Publication date: 25 October 2018

Alejandro García-Jurado, Pilar Castro-González, Mercedes Torres-Jiménez and Antonio L. Leal-Rodríguez

This research has three main objectives. First, it examines influence of gamification on the behavioral intention to use an e-commerce platform. Second, it analyzes the…

Abstract

Purpose

This research has three main objectives. First, it examines influence of gamification on the behavioral intention to use an e-commerce platform. Second, it analyzes the role of the flow state given its importance in terms of behavior in online environments. Finally, the study aims to detect and analyze differences between Millennials and Generation X.

Design/methodology/approach

The theoretical basis for this study stems from technology acceptance model. The extended model incorporates gamification and the optimal state of intrinsic motivation, flow state, as additional constructs. An online consumer panel was used to collect data from 253 Spanish Amazon users. A structural equation modeling, partial least squares, is proposed and multi-group moderation was studied.

Findings

Gamification in Millennials has positive and significant indirect effects on behavioral intention through the flow state. In the case of the Generation X, it has been detected that flow interferes in its perception of ease of use. The behavioral intention of using the Web page is directly correlated with the purchase intention. Companies should offer a fun interface to Millennials and an environment easier to use to the Generation X, for gamification to be successful.

Originality/value

This study expands the research scope in gamification by focusing on e-commerce sector, a field where scientific research is still scarcely developed. It emphasizes the importance of flow as mediator. Age differences confirm the need for segmentation when applying gamification and marketing strategies in e-commerce.

Details

Kybernetes, vol. 48 no. 6
Type: Research Article
ISSN: 0368-492X

Keywords

To view the access options for this content please click here
Article
Publication date: 7 March 2016

Ricardo Monge-González, Juan Antonio Rodríguez-Alvarez and Juan Carlos Leiva

The purpose of this paper is to estimate the impact of one productive development program (PROPYME) in a developing nation like Costa Rica. This program seeks to increase…

Abstract

Purpose

The purpose of this paper is to estimate the impact of one productive development program (PROPYME) in a developing nation like Costa Rica. This program seeks to increase the capacity of small and medium-sized firms (SMEs) to innovate.

Design/methodology/approach

Impacts have been estimated assuming that beneficiary firms are trying to maximize their profits and that PROPYME aims to increase these firms productivity. The impacts were measured in terms of three result variables real average wages employment demand and the probability of exporting. A combination of fixed effects and propensity score matching techniques was used in estimations to correct for any selection bias. The authors worked with panel data companies treated and untreated for the period 2001-2011.

Findings

PROPYME’s beneficiaries performed better than other firms in terms of labor demand and their probability of exporting. In addition, the dose and the duration of the effects of the treatment (timing effects) are important.

Originality/value

The authors study the impact in ways that go beyond the average treatment effects on the treated (ATT) usually estimated in the existing literature. Specifically, the research focusses on the identification of the timing or dynamic effects (i.e. how long should we wait to see results?) and treatment intensity (dosage effects).

Propósito

Se estima el impacto de un programa de desarrollo productivo (Propyme) en un país en vías de desarrollo como Costa Rica. El Propyme busca incrementar la capacidad innovadora de las pequeñas y medidas empresas (pymes) costarricenses.

Diseño/metodológico

el impacto se ha estimado y evaluado asumiendo que las pymes beneficiaras buscan maximizar sus beneficios y que Propyme se enfoca en incrementar la productividad de esas empresas. El impacto se valoró en función de tres variables: salarios reales medios, empleo demandado y la probabilidad de exportar. Se utilizó una combinación de técnicas de efectos fijos y emparejamiento en las estimaciones con el fin de prevenir sesgos de selección. Se trabajó con un panel de datos, incluyendo empresas tratadas (beneficiarias de Propyme) así como no tratadas para el periodo 2001-2011.

Hallazgos

los beneficiarios de Propyme tuvieron mejor desempeño que las restantes empresas en términos de empleo demandado y su posibilidad de exportar. Adicionalmente los efectos dinámicos (dosis y duración) de los tratamientos son importantes.

Originalidad y valor

este artículo evalúa el impacto de una forma que va más allá de lo usual en la literatura por medio de los efectos promedios de los tratamientos sobre los beneficiarios. Esto por cuanto se enfoca en efectos dinámicos como la duración así como la intensidad.

To view the access options for this content please click here
Article
Publication date: 29 March 2021

Antonio-Rafael Ramos-Rodriguez, María Paula Lechuga Sancho and Salustiano Martínez-Fierro

Analyze patterns of co-authorship in hospitality and tourism (H&T) research using bibliometric methods. The purpose of this paper is to answer three questions related to…

Abstract

Purpose

Analyze patterns of co-authorship in hospitality and tourism (H&T) research using bibliometric methods. The purpose of this paper is to answer three questions related to collaborative practices, the number of authors, the order of signatures and the role of the corresponding author.

Design/methodology/approach

The methodology is based on the bibliometric techniques of authorship analyzes published in leading H&T journals. Evaluative techniques provide longitudinal evidence of the evolution of some indicators of authors’ collaboration: the percentage of alphabetized authorships; the percentage of articles were the most relevant author signs in the first, middle or last position; and the position of the corresponding author in the by-line.

Findings

First, the collaborative nature of H&T research is confirmed; almost 80% of articles in the sample are co-authored. Second, over the past 30 years, the alphabetized signature model has been in decline in this field. Today, about 20% of articles indexed in JCR journals are signed alphabetically. Third, the first author’s placement is less consistent than that of the corresponding author.

Practical implications

This work provides relevant information on researchers’ authorship habits that may help evaluators assign credit and accountability and avoid malpractice in the authorial assignment.

Originality/value

This study explores the habits of researchers who collaborate to improve their productivity, impact and reputation. This is often linked to facilitating access to research funding and obtaining recognition from incentive systems. Yet, no research specifically examines trends in signature order or the corresponding author’s role in the H&T field.

Details

International Journal of Contemporary Hospitality Management, vol. 33 no. 4
Type: Research Article
ISSN: 0959-6119

Keywords

To view the access options for this content please click here
Article
Publication date: 6 April 2021

Bruno Fernandes Abrantes, Miguel Torres Preto and Nelson António

This paper aims to explore the characteristics of capability exchange within internationalizing small and medium enterprises (SMEs) of the Portuguese metallurgic and…

Abstract

Purpose

This paper aims to explore the characteristics of capability exchange within internationalizing small and medium enterprises (SMEs) of the Portuguese metallurgic and metal-mechanic sectors.

Design/methodology/approach

Multiple case research instrumentalizes a (manifest) content analysis based upon qualitative data gathered from the interviewing of the strategic apex of four multinational enterprises, codified in the light of the well-known Weber protocol.

Findings

The results uncover the existence of a multi-diffusional approach with a bi-directional regime of transferability, where reciprocal transference is non-simultaneous. Operational rigidities are asserted to be stifling the diffusion of capabilities across subsidiaries and hindering higher economies of learning.

Research limitations/implications

The current paradigm of international capabilization of the sector requires substantial enhancements in its design for the benefit of the firm’s international competitiveness, growth and wealth.

Originality/value

Organizational capabilities are a determinant of competitiveness. Hitherto, the phenomena of (capabilities) mobility and transferability are still acknowledged as a clear gap. This study opens, therefore, avenues on international capabilization in relation to the modeling and testing of global dynamic capabilities and its replicability across industries.

Details

Review of International Business and Strategy, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2059-6014

Keywords

To view the access options for this content please click here
Book part
Publication date: 23 March 2017

Barbara de Lima Voss, David Bernard Carter and Bruno Meirelles Salotti

We present a critical literature review debating Brazilian research on social and environmental accounting (SEA). The aim of this study is to understand the role of…

Abstract

We present a critical literature review debating Brazilian research on social and environmental accounting (SEA). The aim of this study is to understand the role of politics in the construction of hegemonies in SEA research in Brazil. In particular, we examine the role of hegemony in relation to the co-option of SEA literature and sustainability in the Brazilian context by the logic of development for economic growth in emerging economies. The methodological approach adopts a post-structural perspective that reflects Laclau and Mouffe’s discourse theory. The study employs a hermeneutical, rhetorical approach to understand and classify 352 Brazilian research articles on SEA. We employ Brown and Fraser’s (2006) categorizations of SEA literature to help in our analysis: the business case, the stakeholder–accountability approach, and the critical case. We argue that the business case is prominent in Brazilian studies. Second-stage analysis suggests that the major themes under discussion include measurement, consulting, and descriptive approach. We argue that these themes illustrate the degree of influence of the hegemonic politics relevant to emerging economics, as these themes predominantly concern economic growth and a capitalist context. This paper discusses trends and practices in the Brazilian literature on SEA and argues that the focus means that SEA avoids critical debates of the role of capitalist logics in an emerging economy concerning sustainability. We urge the Brazilian academy to understand the implications of its reifying agenda and engage, counter-hegemonically, in a social and political agenda beyond the hegemonic support of a particular set of capitalist interests.

Details

Advances in Environmental Accounting & Management: Social and Environmental Accounting in Brazil
Type: Book
ISBN: 978-1-78635-376-4

Keywords

To view the access options for this content please click here
Article
Publication date: 13 November 2017

Raquel Garde Sánchez, Manuel Pedro Rodríguez Bolívar and Antonio M. López Hernández

The purpose of this paper is to analyse the influence of perceptions of pressure from stakeholders on the managers of state-owned enterprises (SOEs) regarding the need to…

Abstract

Purpose

The purpose of this paper is to analyse the influence of perceptions of pressure from stakeholders on the managers of state-owned enterprises (SOEs) regarding the need to implement socially responsible policies in the supply chain and to disclose corporate social responsibility (CSR) information. The authors also analyse the benefits perceived by public managers from applying CSR in the supply chain and from the greater disclosure of CSR information.

Design/methodology/approach

A structured questionnaire was developed, based on a set of items related to aspects of CSR, and taking into account previous research in this field. The authors also propose a theoretical model with which to analyse relations among the variables studied. This model was verified using structural equation modelling.

Findings

The results obtained are consistent with the proposed model and show that stakeholder pressure has a direct influence on the CSR policies applied by public managers regarding suppliers and information disclosure. The authors also find that public managers believe that applying socially responsible policies in their dealings with suppliers will benefit their business.

Originality/value

Although the question of CSR has been widely debated in the context of private business, very little research has addressed this question in the public sphere, especially in that of SOEs, regarding the practice of socially responsible management with suppliers. Aspects of social responsibility towards suppliers are of considerable importance and some complexity, particularly in public enterprises, which are sometimes the main or only consumer. A better understanding of the connections between these constructs will allow corporate decision makers, particularly those in public companies, to devise appropriate strategies for social responsibility in the supply chain and for the disclosure of CSR information, and thus incorporate stakeholders’ expectations into the design of these strategies.

Details

The International Journal of Logistics Management, vol. 28 no. 4
Type: Research Article
ISSN: 0957-4093

Keywords

To view the access options for this content please click here
Book part
Publication date: 10 November 2016

Núria Puig and Anna Vilanova

The chapter begins by examining the origins of sociology of sport in Spain, which dates back to the transition to democracy, during which period sport became transformed…

Abstract

The chapter begins by examining the origins of sociology of sport in Spain, which dates back to the transition to democracy, during which period sport became transformed progressively from an object of social concern into an object of sociological study. It then goes on to analyse the main factors of activation in particular processes of university teaching staff accreditation which acted as catalysts for the set of processes that fostered the emergence of sociology of sport in Spain. Lastly, the principal study fields are analysed by grouping them into three areas: sport and society, social attitudes to sport and sport facilities and organisations. In the conclusion, an assessment is made of contributions made to the speciality as well as of sociology of sport’s progressive internationalisation, a rare phenomenon prior to 2005 which is now regarded as a major indicator of the maturity of the discipline.

Details

Sociology of Sport: A Global Subdiscipline in Review
Type: Book
ISBN: 978-1-78635-050-3

Keywords

To view the access options for this content please click here
Article
Publication date: 8 January 2019

Luis Ricardo Jacobo, Rafael Garcia, Victor Hugo Lopez and Antonio Contreras

The purpose of this paper is to study the effect of heat treatment (HT) applied to an API X60 steel in corrosion resistance and stress corrosion cracking (SCC…

Abstract

Purpose

The purpose of this paper is to study the effect of heat treatment (HT) applied to an API X60 steel in corrosion resistance and stress corrosion cracking (SCC) susceptibility through slow strain rate tests (SSRT) in NS4 solution and congenital water (CW) to assess external and internal SCC, respectively.

Design/methodology/approach

API X60 steel was heat treated at a temperature of 1,200°C for 30 min followed by water quenching. Specimens from this steel were machined according to NACE TM 198. SSRT were performed in a constant extension rate tests (CERT) machine at room temperature at a strain rate of 1 × 10–6 s–1. For this purpose, a glass cell was used. Corrosion behavior was evaluated through polarization curves (PCs).

Findings

The SCC index obtained from SSRT indicates that the steel heat treated could be susceptible to SCC in CW and NS4 solution; the mechanism of SCC was hydrogen embrittlement. Thus, CW may promote the SCC phenomenon in pipelines. HT improves the steel corrosion resistance. Higher corrosion rate (CR) was observed when the steel is exposed to CW. The corrosion process in X60 steel shows that the oxidation reaction in the anodic branch corresponds to an activation process, and the cathode branches reveal a diffusion process.

Originality/value

The purpose of the heat treatment applied to X60 steel was to generate a microstructure of acicular ferrite to improve the corrosion resistance and SCC behavior.

Details

Anti-Corrosion Methods and Materials, vol. 66 no. 3
Type: Research Article
ISSN: 0003-5599

Keywords

1 – 10 of 171