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One of the most promising advantages of Web service technology is the possibility of creating added-value services by composing existing ones. A key step for composing services lies in the selection of the individual services. In this paper, we propose an approach for selecting optimal Web service composition plan and optimal candidate services, aimed at maximizing service quality and minimizing risk...
A bottom contact organic thin-film transistor (OTFT) using a-sexithiophene (α-6T) as an active layer was fabricated in this paper. α-6T was deposited via vacuum evaporation onto a SiO2/n-Si substrate and was characterized by scanning electron microscope (SEM). The current-voltage characteristics of the α-6T OTFT and its response to different concentrations of methanol, alcohol and secondary butyl...
A CMOS delta-sigma (ΣΔ) pH-to-digital converter has been developed for continuous monitoring of H+-ion concentrations. The SnO2/ITO glass, fabricated sputtering SnO2 on the conductive ITO glass, was used as a pH-sensitive membrane of extended gate field effect transistor (EGFET) operational amplifier. The ΣΔ pH-to-digital converter, constructed by using EGFET-OP to realize switched-capacitor (SC)...
An extended gate ion sensitive field effect transistor with signal interface was presented for continuous monitoring of H+-ion concentrations. The SnO2/ITO glass, fabricated by sputtering SnO2 on the conductive ITO glass, was used as a pHsensitive membrane of extended gate field effect transistor (EGFET). The signal processing circuits, constructed by using differential sensing and noise shaping techniques,...
A bottom contact pentacene based organic thin film transistor (OTFT) was fabricated in this paper. Pentacene thin film acting both as gas sensing layer and the active layer was formed by vacuum evaporation and was characterized by atomic force microscopy (AFM) and x-ray diffraction (XRD). The results show that the film is highly ordered and has a polycrystalline morphology. The current-voltage characteristics...
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