Search results

In recent years, the increasing complexity of the hyper-connected world demands new approaches for social network analysis. The main challenges are to find new computational methods that allow the representation, characterization and analysis of these social networks. Nowadays, formal concept analysis (FCA) is considered an alternative to identifying conceptual structures in a social network. In this FCA-based work, this paper aims to show the potential of building computational models based on implications to represent and analyze two-mode networks.

This study proposes an approach to find three important substructures in social networks such as conservative access patterns, minimum behavior patterns and canonical access patterns. The present study approach considered as a case study a database containing the access logs of a cable internet service provider.

The result allows us to uncover access patterns, conservative access patterns and minimum access behavior patterns. Furthermore, through the use of implications sets, the relationships between event-type elements (websites) in two-mode networks are analyzed. This paper discusses, in a generic form, the adopted procedures that can be extended to other social networks.

A new approach is proposed for the identification of conservative behavior in two-mode networks. The proper implications needed to handle minimum behavior pattern in two-mode networks is also proposed to be analyzed. The one-item conclusion implications are easy to understand and can be more relevant to anyone looking for one particular website access pattern. Finally, a method for a canonical behavior representation in two-mode networks using a canonical set of implications (steam base), which present a minimal set of implications without loss of information, is proposed.

Currently, social network (SN) analysis is focused on the discovery of activity and social relationship patterns. Usually, these relationships are not easily and completely observed. Therefore, it is relevant to discover substructures and potential behavior patterns in SN. Recently, formal concept analysis (FCA) has been applied for this purpose. FCA is a concept analysis theory that identifies concept structures within a data set. The representation of SN patterns through implication rules based on FCA enables the identification of relevant substructures that cannot be easily identified. The authors’ approach considers a minimum and irreducible set of implication rules (stem base) to represent the complete set of data (activity in the network). Applying this to an SN is of interest because it can represent all the relationships using a reduced form. So, the purpose of this paper is to represent social networks through the steam base.

The authors’ approach permits to analyze two-mode networks by transforming access activities of SN into a formal context. From this context, it can be extracted to a minimal set of implications applying the NextClosure algorithm, which is based on the closed sets theory that provides to extract a complete, minimal and non-redundant set of implications. Based on the minimal set, the authors analyzed the relationships between premises and their respective conclusions to find basic user behaviors.

The experiments pointed out that implications, represented as a complex network, enable the identification and visualization of minimal substructures, which could not be found in two-mode network representation. The results also indicated that relations among premises and conclusions represent navigation behavior of SN functionalities. This approach enables to analyze the following behaviors: conservative, transitive, main functionalities and access time. The results also demonstrated that the relations between premises and conclusions represented the navigation behavior based on the functionalities of SN. The authors applied their approach for an SN for a relationship to explore the minimal access patterns of navigation.

The authors present an FCA-based approach to obtain the minimal set of implications capable of representing the minimum structure of the users’ behavior in an SN. The paper defines and analyzes three types of rules that form the sets of implications. These types of rules define substructures of the network, the capacity of generation users’ behaviors, transitive behavior and conservative capacity when the temporal aspect is considered.

The scientific community shares a heritage of knowledge generated by several different fields of research. Identifying how scientific interest evolves is relevant for recording and understanding research trends and society’s demands.

This article presents SciBR-M, a novel method to identify scientific interest evolution from bibliographic material based on Formal Concept Analysis. The SciBR-M aims to describe the thematic evolution surrounding a field of research. The method begins by hierarchically organising sub-domains within the field of study to identify the themes that are more relevant. After this organisation, we apply a temporal analysis that extracts implication rules with minimal premises and a single conclusion, which are helpful to observe the evolution of scientific interest in a specific field of study. To analyse the results, we consider support, confidence, and lift metrics to evaluate the extracted implications.

The authors applied the SciBR-M method for the Educational Data Mining (EDM) field considering 23 years since the first publications. In the digital libraries context, SciBR-M allows the integration of the academy, education, and cultural memory, in relation to a study domain.

Cultural changes lead to the production of new knowledge and to the evolution of scientific interest. This knowledge is part of the scientific heritage of society and should be transmitted in a structured and organised form to future generations of scientists and the general public.

The method, based on Formal Concept Analysis, identifies the evolution of scientific interest to a field of study. SciBR-M hierarchically organises bibliographic material to different time periods and explores this hierarchy from proper implication rules. These rules permit identifying recurring themes, i.e. themes subset that received more attention from the scientific community during a specific period. Analysing these rules, it is possible to identify the temporal evolution of scientific interest in the field of study. This evolution is observed by the emergence, increase or decrease of interest in topics in the domain. The SciBR-M method can be used to register and analyse the scientific, cultural heritage of a field of study. In addition, the authors can use the method to stimulate the process of creating knowledge and innovation and encouraging the emergence of new research.

This study focuses on intellectual capital (IC) as a driver of better business performance. Recent studies suggest that a set of variables may mediate this relationship. This research discusses the mediating role of dynamic capabilities, network competence, technological capabilities, absorptive capabilities and innovation performance between intellectual capital and business performance.

The conceptual model is tested using a sample of 533 Portuguese firms by means of a structural equation model.

It confirms that intellectual capital impacts business performance. Moreover, this only happens indirectly through the mediating chain defined by the variables dynamic capabilities, network competence, technological capabilities, absorptive capabilities and innovation performance.

This study analyzes new mediator variables between the dimensions of the intellectual capital and Portuguese business performance.

This paper aims to explore a new causal link between learning, market and entrepreneurial orientations and firms' performance by introducing dynamic capabilities and competitive advantages as mediator variables.

The mediating role of dynamic capabilities and competitive advantages is tested using a sample of 1,190 Portuguese firms, and structural equation models.

It is shown that dynamic capabilities mediate the relationship between the three orientations–learning, market and entrepreneurial–and competitive advantages of differentiation and cost leadership, and both competitive advantages lead to firm's performance. It is also shown that learning orientation is an antecedent of market orientation and entrepreneurial orientation.

This research shows that firm's performance depends on the capacity of firms to learn, innovate, be proactive, take risks and collect the best market data. Indeed, by optimizing the internal management and knowledge dissemination, firms will develop a set of capabilities and competitive advantages that lead to an appropriate response to market challenges.

This study tests the relationship between strategic orientations and firm's performance by taking the mediating effects of dynamic capabilities and competitive advantages into account. This research was conducted in Portugal.

The complexity of the firm’s external environment, with its constant changes, forces managers to develop novel strategies that can meet new strategic needs. The purpose of this study is to examine the role of reward systems (RSs) in strategic management, as well as their relationship to learning and entrepreneurial orientation (EO), commonly referred to as the driving force behind growth, competitive advantages (CAs) and improved performance. It also focuses on the study of the relationship between EO and business performance (BP), the introduction and testing of the possible antecedents of this relationship and potential mediating factors.

A conceptual model was tested on a sample of 1,190 Portuguese firms using a structural equation model.

It is shown for the first time that learning orientation (LO) is an antecedent of the RSs and, subsequently, of EO. Additionally, the CAs of differentiation and cost leadership play a mediating role in the relationship between EO and BP. Furthermore, RSs are also a driving force behind both CAs.

This study makes several empirical and theoretical contributions, addressing the gap in the literature about the role of RSs in strategic management. It tests the relationship between LO and the firm’s performance by taking the mediating effects of RSs, EO and CAs into account. Additionally, we discuss LO as an antecedent strategic variable of human resources practices, in particular, RSs. Finally, we broaden the scope of our research by examining these issues in the context of Portuguese SMEs from different industries.

This paper aims to explore a new causal link between market orientation and business performance by introducing dynamic capabilities as a mediator of the relationship between market orientation and competitive advantages, which ultimately determine business performance.

The mediating roles of dynamic capabilities and competitive advantages are tested with a sample of 1,190 Portuguese firms using a structural equation model.

The results confirm the hypotheses regarding the mediating roles of the competitive advantages (differentiation and cost leadership) in the relationship between dynamic capabilities and business performance. Additionally, dynamic capabilities also mediate the relationship between market orientation and competitive advantages.

This study shows that business performance depends on the capacity of firms to collect the best market information on customers and competitors, to disseminate this information throughout their internal structure and ultimately optimize its use to respond appropriately to market challenges and trends. These will provide firms with a set of capabilities and a competitive advantage.

This study provides empirical evidence on the understanding of the relationship between market orientation and performance, through the mediating effects of both dynamic capabilities and competitive advantages.

This paper aims to analyze the adherence of social responsibility management (SRM) in Brazilian organizations and to identify the driving and the resistance forces to implement it.

This article presents a deep literature review on SRM, corporate social responsibility (CSR) and stakeholder management, which aim to support a survey research to define, according to experts, the market perception of adherence of SRM.

The paper presents evidence that there is adherence on the part of the practices of organizations that adhere to the theoretical foundations of SRM in Brazil. It was found that organizations should seek to improve nine areas to implement SRM and can use each of these areas strategically or all together.

This study provides an opportunity for employees whose perceptions are aligned based on educational programs and engagement in CSR, and these gains favor the improvement of their own management and the quality of relationships.

The research provides an opportunity to recast actions and the possibility of being recognized by stakeholders as active agents in this process.

This study sheds new light on both SRM and the CSR literature because of its attempt to bridge the theoretical foundations and market practices, which was performed to verify the gaps in corporative SRM process of Brazilian organizations. This study highlights for researchers and practitioners a relevant field of study whose importance is widely recognized but whose results remain scarce and limited.

Broad-spectrum cephalosporin resistance is rapidly increasing in Escherichia coli, representing a food safety problem. The purpose of this paper is to characterize eight extended-spectrum-ß-lactamase (ESBL) and acquired AmpC ß-lactamase-producing E. coli isolates and virotypes associated, obtained from chicken and pork food samples in Puebla, Mexico.

Samples (36 from chicken and 10 from pork) were cultured on Levine agar plates supplemented with cefotaxime (2 mg/L) for isolation of cefotaxime-resistant (CTXR) E. coli. CTXR-E. coli isolates were detected in 33 of 46 samples (72 percent), and one isolate/sample was characterized (28 from chicken and 5 from pork), for ESBL production, phylogenetic group, sequence typing, resistance and virulence genes by PCR and sequencing.

Results showed 16 ESBL-E. coli (35 percent) (12/16 belonging to phylogroup B1) and 8 CMY-2-E. coli (17 percent). ESBL detected were as follows (number of isolates): CTX-M-2 (8); CTX-M-1 (2); CTX-M-15 (1); SHV-2a (4) and TEM-52c (1). In total, 20 different sequence types (STs) were identified among the ESBL- or CMY-2-producing E. coli strains, which included four new ones. The CTX-M-15 β-lactamase was detected in one E. coli ST617-ST10 Cplx-B1 strain that also carried ibeA gene. One CMY-2-positive strain of lineage ST224-B2 was detected and it carried the qnrA1 gene.

In this study, a ST131-based virotyping scheme for strains from food of animal origin was established since this kind of strains constitutes an important vehicle of virulent ESBL- and CMY-2-producing E. coli isolates, which could be transmitted to humans by direct contact or through the food chain.

This issue includes five of the best papers, from six different countries, presented in the Cladea Assembly of 2015. This introduction summarises the papers and presents an analysis of Latin American publications on management, and of the advantages and conditions for international collaboration. The first article looks at the positive impact of the decentralization of decision-making processes and the formalisation of work in the innovation of small and medium enterprises. The second studies the fear of failure in work and its relationship to demographic variables. The third analyses the impact of the domestic violence suffered by workers on customer services in Puerto Rican companies. The fourth discusses the relationship between teleworking and the work-family conflict, and finally, the fifth is aimed at optimising the management of dependent demand inventory systems.

This issue includes five articles chosen among the best papers presented at the Cladea Assembly of 2015 organised by Universidad de Valparaíso (Chile). The articles were sent in from Brazil, Chile, Colombia, Costa Rica, Spain, and Puerto Rico, and were the best assessed in the fields of organisational behaviour, leadership and human capital management, entrepreneurships and SMEs, technology management and innovation, and operations management and value chains.

The selection process began with the evaluation of the works sent to the conference for each topic. The author wish to thank the organisers, those in charge of each topic, and all the evaluators that helped select the best works. In particular, we thank Sergio Olavarrieta, José Ernesto Amorós, Jorge Ayala, Silvio Borrero, Daniel Cabrera, Reinaldo Calvo, Consuelo García, Valeska Geldres, Jorge Gilbert, Olga Pizarro, José Antonio Robles, and Jorge Tarzijan. Authors interested in publishing their articles were asked to send in a revised version. These new versions were then subjected to a double blind evaluation, and subsequent revisions until reaching the current publication. This has been a collective process in which dozens of academics from all the Cladea schools and countries have taken part.

Este número incluye cinco de los mejores trabajos presentados en la asamblea de Cladea 2015, provenientes de seis países. En la presente introducción se resumen y comentan los trabajos, se ofrece un análisis acerca de las publicaciones latinoamericanas sobre gerencia y de las ventajas y condiciones de la colaboración internacional. El primer artículo analiza el positivo impacto de la descentralización de las decisiones y la formalización del trabajo en la innovación de las PYMES. El segundo estudia el miedo al fracaso en el trabajo y su relación con variables demográficas. El tercero analiza el impacto en el servicio al cliente de la violencia doméstica experimentada por trabajadoras en empresas de Puerto Rico. El cuarto estudia la relación entre el trabajo a distancia en el hogar (teletrabajo) y el conflicto familia-empresa. El quinto se orienta a optimizar el manejo de inventarios en sistemas con demanda dependiente.

En este número publicamos cinco artículos escogidos entre las mejores ponencias presentados en la Asamblea de CLADEA 2015 organizada por la Universidad de Valparaíso (Chile). Los artículos provienen de Brasil, Chile, Colombia, Costa Rica, España y Puerto Rico, y fueron los mejor evaluados en los temas de comportamiento organizacional, liderazgo y gestión del capital humano, emprendimientos y PYMES (pequeña y mediana empresa), gestión tecnológica e innovación, y gestión de operaciones y cadena de valor.

El proceso de selección se inició por las evaluaciones que se hicieron en cada tema para aceptar los trabajos enviados a la asamblea. Debemos agradecer a los organizadores, a los encargados de cada tema y a todos los evaluadores que permitieron tener una selección de los mejores trabajos, en especial a Sergio Olavarrieta, José Ernesto Amorós, Jorge Ayala, Silvio Borrero, Daniel Cabrera, Reinaldo Calvo, Consuelo García, Valeska Geldres, Jorge Gilbert, Olga Pizarro, José Antonio Robles, y Jorge Tarzijan. Posteriormente desde esta revista procedimos a solicitar versiones revisadas a los autores que estuvieran interesados en publicarlos, versiones sometidas a evaluación doble ciego, que llevaron a posteriores revisiones hasta la publicación actual. Ha sido un proceso colectivo donde participaron docenas académicos de todas las escuelas y países de Cladea.