Sami Jokela

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In the SmartPush project professional editors add semantic metadata to information flow when the content is created. This metadata is used to filter the information flow to provide the end users with a personalized news service. Personalization and delivery process is modeled as software agents, to whom the user delegates the task of sifting through(More)
Digitalization of content and exponential growth of Internet and electronic commerce are changing the media industry. The availability of structured content enables new ways to produce and deliver information. This paper explains the role of semantic metadata in developing content for an adaptive news service in the SmartPush-project. In SmartPush, news(More)
Zinc oxide ͑ZnO͒ is a wide-band gap semiconductor that has attracted tremendous interest for optical, electronic, and mechanical applications. First-principles calculations by ͓C. G. Van de Walle, Phys. Rev. Lett. 85, 1012 ͑2000͔͒ have predicted that hydrogen impurities in ZnO are shallow donors. In order to determine the microscopic structure of hydrogen(More)
The pressure response of the ultraviolet photoluminescence of ZnO nanocrystallites and MgZnO nanoalloy of composition 15% Mg:85% Zn of the wurtzite structure was studied. The authors found that up to 7 GPa the pressure coefficients of ZnO and MgZnO are 23.6 and 27.1 meV/ GPa, respectively. The pressure coefficient of the ZnO nanocrystallites is similar to(More)