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Lykourentzou I.,CRP Henri Tudor | Djaghloul Y.,CRP Henri Tudor | Papadaki K.,Bank of Greece | Dagka F.,National Technical University of Athens | Latour T.,CRP Henri Tudor
Communications in Computer and Information Science | Year: 2011

Corporate wikis are increasingly being adopted by enterprises as a solution to various organizational processes. Subsequently a significant number of research works have started focusing on providing results on both successful and unsuccessful corporate wiki implementations. Nevertheless, the scope of these studies is usually limited on a specific organizational case or focuses on a limited set of aspects of the wiki adoption, e.g. either the technological or the cultural one. Our objective in this work is to provide an overview of the key factors affecting the successful implementation of an organizational wiki, by analyzing thirty case studies reported in the research literature. The result of this analysis is the identification of a core set of common best practices to be taken into account by stakeholders when planning the integration of a wiki within a corporate context. In this way, the study aims at contributing to the planning and the realization of more successful corporate wiki implementations with enterprise environments. © 2011 Springer-Verlag. Source


Mamatzakis E.,University of Sussex | Koutsomanoli-Filippaki A.,Bank of Greece
Energy Policy | Year: 2014

This paper examines the rationality of the price forecasts for energy commodities of the United States Department of Energy's (DOE), departing from the common assumption in the literature that DOE's forecasts are based on a symmetric underlying loss function with respect to positive vs. negative forecast errors. Instead, we opt for the methodology of Elliott et al. (2005) that allows testing the joint hypothesis of an asymmetric loss function and rationality and reveals the underlying preferences of the forecaster. Results indicate the existence of asymmetries in the shape of the loss function for most energy categories with preferences leaning towards optimism. Moreover, we also examine whether there is a structural break in those preferences over the examined period, 1997-2012. © 2013 Elsevier Ltd. Source


Degiannakis S.,Bank of Greece | Filis G.,Bournemouth University | Kizys R.,University of Portsmouth
Energy Journal | Year: 2014

The paper investigates the effects of oil price shocks on stock market volatility in Europe by focusing on three measures of volatility, i.e. the conditional, the realized and the implied volatility. The findings suggest that supply-side shocks and oil specific demand shocks do not affect volatility, whereas, oil price changes due to aggregate demand shocks lead to a reduction in stock market volatility. More specifically, the aggregate demand oil price shocks have a significant explanatory power on both current- and forward-looking volatilities. The results are qualitatively similar for the aggregate stock market volatility and the industrial sectors' volatilities. Finally, a robustness exercise using short- and long-run volatility models supports the findings. Copyright © 2014 by the IAEE. All rights reserved. Source


Lykourentzou I.,CRP Henri Tudor | Lykourentzou I.,National Technical University of Athens | Dagka F.,National Technical University of Athens | Papadaki K.,Bank of Greece | And 2 more authors.
Enterprise Information Systems | Year: 2012

The wiki technology is increasingly being used in corporate environments to facilitate a broad range of tasks. This survey examines the use of wikis on a variety of organisational tasks that include the codification of explicit and tacit organisational knowledge and the formulation of corporate communities of practice, as well as more specific processes such as the collaborative information systems development, the interactions of the enterprise with third parties, management activities and organisational response in crisis situations. For each one of the aforementioned corporate functions, the study examines the findings of related research literature to highlight the advantages and concerns raised by the wiki usage and to identify specific solutions addressing them. Finally, based on the above findings, the study discusses various aspects of the wiki usage in the enterprise and identifies trends and future research directions on the field. © 2012 Taylor and Francis Group, LLC. Source


Lykourentzou I.,CRP Henri Tudor | Vergados D.J.,Norwegian University of Science and Technology | Papadaki K.,Bank of Greece | Naudet Y.,CRP Henri Tudor
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013

Crowdsourcing is increasingly gaining attention as one of the most promising forms of large-scale dynamic collective work. However current crowdsourcing approaches do not offer guarantees often demanded by consumers, for example regarding minimum quality, maximum cost or job accomplishment time. The problem appears to have a greater impact in corporate environments because in this case the above-mentioned performance guarantees directly affect its viability against competition. Guided crowdsourcing can be an alternative to overcome these issues. Guided crowdsourcing refers to the use of Artificial Intelligence methods to coordinate workers in crowdsourcing settings, in order to ensure collective performance goals such as quality, cost or time. In this paper, we investigate its potential and examine it on an evaluation setting tailored for intra and inter-corporate environments. © Springer-Verlag 2013. Source

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