1,720,959 research outputs found
Discrete-time control for DC-AC converters based on sliding mode design
No full textA discrete-time linear state-feedback controller with feedforward compensation is presented for the design of voltage source DC-AC converters. The proposed algorithm is based on duty-ratio control and is obtained by modifying an existing sliding mode design method. It does not introduce chattering in the output waveforms, and its robustness with respect to parameter variations is enhanced by introducing an integral action. An intuitive approach for the selection of the controller parameters is developed. The design criteria are illustrated with reference to a laboratory prototype by means of various experiments, intended to test both stationary and dynamic performance. © 2012 The Institution of Engineering and Technology
Exploring bluewashing practices of alleged sustainability leaders through a counter-accounting analysis
No full textThis paper is aimed at analyzing, through a counter-accounting approach, to what extent companies considered to be sustainability leaders release transparent and balanced information on their commitment to the United Nations Global Compact (UNGC) and Sustainable Development Goals (SDGs). A content analysis was conducted on the sustainability reports of a sample of 28 companies from the UNGC LEAD program, and the results were compared with information disclosed by external sources not controlled by the studied organizations. Corporate disclosure counter-accounting reveals that more than 80% of the significant negative events related to LEAD companies were not reported or were only partially reported in their sustainability reports. Contrary to researchers' initial expectations, the length of the sustainability reports was not positively associated with their completeness or transparency. The findings of this study contribute to the literature on bluewashing and counter-accounting. They question the performance of companies considered to be sustainability leaders and the transparency of their reporting practices. From a managerial standpoint, the analysis of the results points at the necessity to shift the focus from the quantity of reports to their quality and transparency
Corporate social responsibility embeddedness through a social network analysis: The case of an Italian multiutility company
No full textTo gain substantial benefits, corporate social responsibility (CSR) needs to be embedded within an organization. Through a social network analysis, this study analyzes to what extent an Italian multiutility company, strategically committed to sustainability, integrates social and environmental issues in its strategy, operations, and routines. The paper aims to answer the following two questions: (a) How can an investigation of the level of information exchange help in identifying whether CSR is embedded or peripheral in a company?; (b) how can an investigation of the role of the CSR department help in identifying whether CSR is embedded or peripheral in a company? The study reveals the frequency and density of information exchange regarding social and environmental issues among 67 business units as well as highlighting the real role played by the CSR department. This research contributes to the current debate on CSR embeddedness by showing how an exploration of internal social networks reveals the extent to which CSR is integrated within strategy, operations, and routines. It also provides useful suggestions for managers on ways to improve the level of integration
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Triple Junction solar cells: system implications of the evolution of photovoltaic technology
No full textRom
- …
