20 research outputs found
Small worlds and board interlocking in Brazil: a longitudinal study of corporate networks, 1997-2007
Social Network Analysis (SNA) is an emerging research field in finance, above all in Brazil. This work is pioneering in that it is supported by reference to different areas of knowledge: social network analysis and corporate governance, for dealing with a similarly emerging topic in finance; interlocking boards, the purpose being to check the validity of the small-world model in the Brazilian capital market, and the existence of associations between the positioning of the firm in the network of corporate relationships and its worth. To do so official data relating to more than 400 companies listed in Brazil between 1997 and 2007 were used. The main results obtained suggest that the configuration of the networks of relationships between board members and companies reflects the small-world model. Furthermore, there seems to be a significant relationship between the firm’s centrality and its worth, described according to an “inverted U” curve, which suggests the existence of optimum values of social prominence in the corporate network
Small Worlds and Board Interlocking in Brazil: A Longitudinal Study of Corporate Networks, 1997-2007
Effect of diffusion on absorption and saturation of infrared radiation in molecular gases
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Localization based on acoustic and seismic array processing
In this poster, we consider the analysis, implementation, and application of wideband sources using both seismic and acoustic sensors. We use the AML algorithm to perform acoustic DOA. For non-uniform noise spectra, whitening filtering was applied to the received acoustic signals before the AML operation. For short-range seismic DOA applications, one method was based on eigen-decomposition of the covariance matrix and a second method was based on surface wave analysis. Experimental estimation of the DOAs and resulting localizations of a source generated by striking a heavy metal plateby a hammer on the ground using the acoustic and seismic signals individually and jointly are reported