Alexander Zemliak, Fernando Reyes and Sergio Vergara
In this paper, we propose further development of the generalized methodology for analogue circuit optimization. This methodology is based on optimal control theory. This approach…
Abstract
Purpose
In this paper, we propose further development of the generalized methodology for analogue circuit optimization. This methodology is based on optimal control theory. This approach generates many different circuit optimization strategies. We lead the problem of minimizing the CPU time needed for circuit optimization to the classical problem of minimizing a functional in optimal control theory.
Design/methodology/approach
The process of analogue circuit optimization is defined mathematically as a controllable dynamical system. In this context, we can formulate the problem of minimizing the CPU time as the minimization problem of a transitional process of a dynamical system. To analyse the properties of such a system, we propose to use the concept of the Lyapunov function of a dynamical system. This function allows us to analyse the stability of the optimization trajectories and to predict the CPU time for circuit optimization by analysing the characteristics of the initial part of the process.
Findings
We present numerical results that show that we can compare the CPU time for different circuit optimization strategies by analysing the behaviour of a special function. We establish that, for any optimization strategy, there is a correlation between the behaviour of this function and the CPU time that corresponds to that strategy.
Originality/value
The analysis shows that Lyapunov function of optimization process and its time derivative can be informative sources for searching a strategy, which has minimal processor time expense. This permits to predict the best optimization strategy by analyzing only initial part of the optimization process.
VENEZUELA: Opposition arrest will inflame tensions
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DOI: 10.1108/OXAN-ES242708
ISSN: 2633-304X
Keywords
Geographic
Topical
His calls come amid a corruption scandal surrounding his efforts in February to encourage military defections and force humanitarian aid into Venezuela from Colombia. While the…
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DOI: 10.1108/OXAN-DB244681
ISSN: 2633-304X
Keywords
Geographic
Topical
Judith Vergara Garavito and Sergio J. Chión
This paper aims to examine the relationship between cash holdings (CH) and expected equity return in a sample of firms of Pacific alliance countries.
Abstract
Purpose
This paper aims to examine the relationship between cash holdings (CH) and expected equity return in a sample of firms of Pacific alliance countries.
Design/methodology/approach
This paper constructed a panel of Pacific alliance firms for the period ranging from 2010 to 2016. This paper estimated different specification models using multivariate regression, and the statistical technique used to validate the hypothesis was panel data.
Findings
Results showed that there is a positive relationship between CH and expected equity return (r). The relationship between CH and systematic risk (ß) was estimated and this paper found a positive and statistically significant association. Findings suggest that corporate liquidity contains underlying information that contributes to explain the expected equity return, which, if ignored, can produce quite misleading results.
Originality/value
The results of this study have both academic and practical implications. First, the findings of the research contribute to a better understanding of the asset pricing models in emerging countries. On the other hand, the results obtained in this study can serve shareholders to make better estimations of the expected equity return, so investors can improve the risk-return trade-off due to the model allow a better estimation of the risk-return relation.
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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 politics in…
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.
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Gabriela Lobo Veiga, Edson Pinheiro de Lima, José Roberto Frega and Sergio E. Gouvea da Costa
To investigate the relationship between performance frontier and operations strategy. A two-level conceptual framework is proposed based on performance elements that act as…
Abstract
Purpose
To investigate the relationship between performance frontier and operations strategy. A two-level conceptual framework is proposed based on performance elements that act as output/input variables and delimit the scope of the frontier analysis.
Design/methodology/approach
The framework proposition is based on the fourth round of high-performance manufacturing survey data. A representative set of variables for assessing performance based on operations strategy constructs is defined through multivariate data analysis techniques. The main method used is the principal component analysis.
Findings
The proposed first-level conceptual framework formalizes the relationships between performance frontier analysis techniques and operations strategy, delimiting the scope and the structural definitions. The second-level conceptual framework defines the constructs of the input and output dimensions for frontier analysis studies.
Originality/value
The paper contribution is developed in the gap of market-led orientation to study operations strategy performance frontier since most related literature focuses on capabilities development with a main focus on the resource-based view (RBV) approach. A conceptual framework based on the competitive priorities is therefore proposed to represent the operations strategy in the view of the frontier techniques. The value lies in defining performance measures which are not a straightforward task as the growth of organization competitiveness and complexity require multiple performance measures. A deeper understanding of frontier estimation on the operations strategy context is also provided, contributing to positively influence firms to succeed in the current dynamic competitive environments.
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Dimitrios Kafetzopoulos, Katerina Gotzamani and Fotios Vouzas
The main purpose of this study is to investigate the role of organizational culture in creating a supportive environment for business model innovation (BMI) by focusing on the…
Abstract
Purpose
The main purpose of this study is to investigate the role of organizational culture in creating a supportive environment for business model innovation (BMI) by focusing on the mediating role of strategic flexibility and the moderating effect of technological capability.
Design/methodology/approach
To achieve this objective an empirical survey was conducted among 379 participant firms in Greece. CFA and finally hierarchical regression analysis were performed to validate the data and examine the hypothesized relationships.
Findings
The results show that strategic flexibility mediates the relationship between organizational culture and BMI. The effect of organizational culture on strategic flexibility is stronger for firms with increased technological capability.
Research limitations/implications
Data were collected at only one point in time from one country, Greece. This might pose limitations on the generalizability of our results. Furthermore, we did not explore many internal or external mediating or moderating factors in the relationship between organizational culture and BMI.
Practical implications
Managers should consider incorporating a suitable organizational culture into their strategies to enable them improve their strategic flexibility, which further promotes BMI.
Originality/value
The current state of knowledge of both theory and practice for critical organizational factors such as organizational culture, strategic flexibility, BMI and technological capability will be extended.
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Conservative, continuity candidate Federico Gutierrez still appears to be Petro’s closest challenger. However, a late surge by populist Rodolfo Hernandez has shocked the…