Corporate Governance and Firm Performance: Results from Greek Firms

In this paper, we construct a Governance Index for a sample of Greek companies quoted on the Athens Stock Exchange. We then classify firms, using each firm governance index, into three governance portfolios. Furthermore, the Fama and French model, extended to include a momentum variable, is tested for each of the three governance portfolios. Our findings suggest that most of the firms in our sample are semi-democracies followed by democracies and dictatorships respectively. Good governance appears to be of value in as much as we found higher Tobin’s q ratios for democracies followed by semi-democracies and dictatorships. We, also, report significant negative abnormal returns for shareholder-friendly and manager-friendly firms. The findings of significant negative abnormal returns are consistent with inefficient capital markets. At a practitioner level, the results imply that firms should practice vigorously good governance, as it is a policy of value to shareholders and possibly to other stakeholders.Corporate Governance, Firm Performance, Democratic and Dictatorship Firms

Fiber Optic-Based Pressure Sensing Surface for Skin Health Management in Prosthetic and Rehabilitation Interventions

Applied physic

Corporate Governance and Firm Performance: Results from Greek Firms

In this paper, we construct a Governance Index for a sample of Greek companies quoted on the Athens Stock Exchange. We then classify firms, using each firm governance index, into three governance portfolios. Furthermore, the Fama and French model, extended to include a momentum variable, is tested for each of the three governance portfolios. Our findings suggest that most of the firms in our sample are semi-democracies followed by democracies and dictatorships respectively. Good governance appears to be of value in as much as we found higher Tobin’s q ratios for democracies followed by semi-democracies and dictatorships. We, also, report significant negative abnormal returns for shareholder-friendly and manager-friendly firms. The findings of significant negative abnormal returns are consistent with inefficient capital markets. At a practitioner level, the results imply that firms should practice vigorously good governance, as it is a policy of value to shareholders and possibly to other stakeholders

Corporate Governance and Firm Performance: Results from Greek Firms

In this paper, we construct a Governance Index for a sample of Greek companies quoted on the Athens Stock Exchange. We then classify firms, using each firm governance index, into three governance portfolios. Furthermore, the Fama and French model, extended to include a momentum variable, is tested for each of the three governance portfolios. Our findings suggest that most of the firms in our sample are semi-democracies followed by democracies and dictatorships respectively. Good governance appears to be of value in as much as we found higher Tobin’s q ratios for democracies followed by semi-democracies and dictatorships. We, also, report significant negative abnormal returns for shareholder-friendly and manager-friendly firms. The findings of significant negative abnormal returns are consistent with inefficient capital markets. At a practitioner level, the results imply that firms should practice vigorously good governance, as it is a policy of value to shareholders and possibly to other stakeholders

Efficient and Validated Time Domain Numerical Modeling of Semiconductor Optical Amplifiers (SOAs) and SOA-based Circuits

Semiconductor optical amplifiers (SOAs) have been extensively used in a wealth of telecom and datacom applications as a powerful building block that features large optical gain, all-optical gating function, fast response, and ease of integration with other functional semiconductor devices. As fabrication technologies are steadily maturing toward enhanced yield, SOAs are foreseen to play a pivotal role in complex photonics integrated circuits (PICs) of the near future. From a design standpoint, accurate numerical modeling of SOA devices is required toward optimizing PICs response from a system perspective, while enhanced circuit complexity calls for efficient solvers. In this book chapter, we present established experimentally validated SOA numerical modeling techniques and a gain parameterization procedure applicable to a wide range of SOA devices. Moreover, we describe multigrid concepts and implicit schemes that have been only recently presented to SOA modeling, enabling adaptive time stepping at the SOA output, with dense sampling at transient phenomena during the gain recovery and scarce sampling during the steady-state response. Overall, a holistic simulation methodology approach along with recent research trends are described, aiming to form the basis of further developments in SOA modeling

Chapter Efficient and Validated Time Domain Numerical Modeling of Semiconductor Optical Amplifiers (SOAs) and SOA-based Circuits

Artificial intelligenc