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Market-level information diffused by print media may contribute to the legitimation of an emerging technology and thus influence the diffusion of competing technological standards. After analyzing more than 10,000 trade media abstracts from the Local Area Networks (LAN) industry published between 1981 and 2000, we found the presence of differential effects on the adoption of competing standards by two market-level information types: technology and product availability. The significance of these effects depends on the technology's order of entry and suggests that high-tech product managers should make strategic use of market-level information by appropriately focusing the content of their communications. 相似文献
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Athanasios Kabasakalis George Tsalis Ekaterini Zafrana Demetrios Loupos Vassilis Mougios 《Journal of sports sciences》2013,31(8):747-756
AbstractThroughout adolescence, swimmers begin to carry out demanding endurance and high-intensity training sets, the effect of which on redox status is largely unknown. The aim of the present study was to investigate the effects of 2000-m continuous swimming and 6 × 50-m maximal swimming on the redox status of adolescent swimmers. Fifteen male and 15 female swimmers, aged 14–18 years, provided blood samples before, immediately after, 1 h after, and 24 h after each exercise for the determination of redox status parameters. Oxidative damage was short-lived and manifest as increases in 8-hydroxy-2?-deoxyguanosine (8-OHdG) 1 h after high-intensity exercise (39%, P < 0.001) and in malondialdehyde immediately after both exercises (65%, P < 0.001). Alterations in antioxidant parameters were sustained during recovery: reduced glutathione decreased 24 h post-exercise (11%, P = 0.001), uric acid increased gradually after high-intensity exercise (29%, P < 0.001) and bilirubin peaked 24 h post-exercise (29%, P < 0.001). Males had higher 8-OHdG (49%, P = 0.001) and uric acid (29%, P < 0.001) concentrations than females. However, females showed higher values of malondialdehyde than males immediately post-exercise (30%, P = 0.039), despite lower pre-exercise values. In conclusion, both endurance and high-intensity exercise perturbed the redox balance without inducing prolonged oxidative damage in trained adolescent male and female swimmers. These swimming training trials were not found to be detrimental to the redox homeostasis of adolescents. 相似文献
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Learning outcomes and processes in massively multiplayer online games: exploring the perceptions of players 总被引：1，自引：0，他引：1
Iro Voulgari Vassilis Komis Demetrios G. Sampson 《Educational technology research and development : ETR & D》2014,62(2):245-270
Over the past decade research has recognised the learning potential of massively multiplayer online games (MMOGs). MMOGs can be used by the technology-enhanced learning research community to study and identify good educational practices that may inspire engaging, creative and motivating approaches for education and learning. To this end, in this research paper, we aim to explore the learning outcomes and processes emerging in the environment of MMOGs by initially studying the relevant perceptions of the players. Based on a theoretical framework referring to the cognitive, the social, and the affective aspects of a technology-supported learning environment, and through a mixed-method research and the analysis of qualitative data from 22 individual and group interviews, and quantitative data from a wider survey (minimum N = 221), we map and examine the cognitive, the skill-based, the social, and the affective potential impact of MMOGs. More specifically this study presents the perceptions of players on the learning impact of MMOGs, the potential transfer of skills to other domains, the learning practices they employ, and elements of the design of the environment that may present positive conditions for learning. We attempt to contribute to the research field and also provide insights for the design of technology-enhanced learning environments, by examining and mapping elements of MMOGs from the perspective of the design of an effective learning environment and based on empirical data. 相似文献
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Demetrios SarantisAuthor Vitae Yannis CharalabidisAuthor VitaeDimitris AskounisAuthor Vitae 《Government Information Quarterly》2011,28(1):117-128
As the implementation of e-Government projects is becoming increasingly important in both public and private organizations, the need to successfully tackle project management emerges. Without a project management framework, those who commission an e-government project, those who manage it and also those who work on it will not have the necessary tools to plan, organize, monitor and re-schedule tasks, responsibilities and milestones. The present paper outlines a goal-driven and knowledge-based framework to plan and manage the critical aspects of e-government projects. A specifically designed tool supports the framework application and a lighthouse project of the Greek public sector is presented to illustrate the application context, leading to reusable conclusions on achievements and problems faced. 相似文献
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Rizos D Karababa P Sarandakou A Panagiotakis O Haliassos A Makris K Psarra K Bairaktari E Spyropoulou P Nikolou C Galiatsatos N Trakas N Ferderigou A Seferiadis K;Greek National Clinical Chemistry Registration Commission 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2011,21(1):30-37
In Greece, there is no officially organized training in clinical chemistry for scientists. The Greek Society of Clinical Chemistry-Clinical Biochemistry decided to organize an intensive educational program of 18 seminars on clinical chemistry content as it is described in the EC4 Syllabus. The duration of each seminar was about 6 hours and consisted of 6 to 9 lectures. At the end of each seminar there was a voluntary written examination, comprised of 24 multiple choice questions. Successful completion of the Educational program was leading to a Certificate of Competence. Two cycles of the 18 seminars were performed: 1st cycle from October 2003 to December 2005 and 2nd cycle from March 2005 to October 2007. One hundred eighty nine colleagues was the mean attendance per seminar for the seminars of the 1st cycle and 38 colleagues for the seminars of the 2nd cycle. The mean participation to the examination for each seminar was almost 80% for the 1st cycle and 68% for the 2nd cycle. More than 80% of the participants performed Good or Very good in the examination in both cycles. It is estimated that more than 40% of the scientists who practice Clinical Chemistry in Greece, participated to this educational activity. This program is now provided as an e-learning application, and it is open for all scientists who want to follow the discipline of clinical chemistry. 相似文献
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Abeer Arafat Maram Na’es Vicky Kantarelou Naseem Haddad Anastasia Giakoumaki Vasilike Argyropoulos Demetrios Anglos Andreas-Germanos Karydas 《Journal of Cultural Heritage》2013,14(3):261-269
Selected copper alloy artefacts from the collection of the Umm Qais museum at Irbid, Jordan, were studied by SEM-EDS analysis, while in situ analyses were performed by means of portable μ-XRF and LIBS spectrometers. Analysis and characterization of base metal and corrosion products of the copper alloyed artefacts were performed in relation to the environmental conditions of the display and as part of the overall assessment of the museum environment. Findings of this study are directed towards guiding a preventive conservation strategy for the copper alloyed artefacts at the Umm Qais museum. 相似文献
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