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Event-driven programming is a popular model for writing programs for tiny embedded systems and sensor network nodes. While event-driven programming can keep the memory overhead down, it enforces a state machine programming style which makes many programs difficult to write, maintain, and debug. We present a novel programming abstraction called protothreads(More)
Creative information exploration refers to a novel framework for exploring large volumes of heterogeneous information. In particular, creative information exploration seeks to discover new, surprising and valuable relationships in data that would not be revealed by conventional information retrieval, data mining and data analysis technologies. While our(More)
  • Oliver Schmidt, Arnd Geis, Peter Kiesel, Chris G Van De Walle, Noble M Johnson, Andrey Bakin +2 others
  • 2005
The electrical properties of high-resistivity zinc oxide (ZnO) bulk and epi-samples are strongly influenced by the sample ambient. Bulk samples that are highly resistive in ambient air can be reversibly transformed into a high conducting state under vacuum. As an explanation we suggest a conducting electron channel at the ZnO surface. Under vacuum this(More)
Most of the ZnO semiconductor device applications are currently hampered by the lack of control over the electrical conductivity. As-grown ZnO usually exhibits n-type conductivity, and the cause for this residual doping is heavily debated. Possible origins for the n-background doping of ZnO are (1) unintentionally incorporated impurities (e. (3) extended(More)
  • Oliver Schmidt, Michael Bassler, Peter Kiesel, Oliver Wolst, Gottfried H Döhler
  • 2006
In optical biosensors waveguides are a good choice to deliver light to the area used for sensing. In traditional optical waveguides the light is confined by total internal reflection inside of a high index layer surrounded by regions of low refractive index. Since many sensing applications are based on liquids, it is necessary to guide the light within the(More)
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