We present PROPO-an experimental expert system using probability-possibility transformation for p... more We present PROPO-an experimental expert system using probability-possibility transformation for pulmonary tuberculosis diagnosis. We describe a transformation between the probabilistic logic and the possibilistic logic as a suitable reasoning engine for medical expert systems. Further more, a structure of the system including knowledge base and inference of the system is proposed. An example of performance of the system testing the knowledge base on pulmonary tuberculosis diagnosis is illustrated.
Two types of co-operatives can be distinguished in Hanoi: transformed co-operatives and newly est... more Two types of co-operatives can be distinguished in Hanoi: transformed co-operatives and newly established co-operatives. Transformed co-operatives are the old-style collective co-operatives that were transformed after the adoption of the Co-operative Law in 1997. New co-operatives are those established after the new law. These two types of co-operatives have different characteristics and strategies. Transformed co- operatives are more engaged in
1 School of Chemical Engineering and Bioengineering, University of Ulsan, Daehak-ro 102, Nam-gu, ... more 1 School of Chemical Engineering and Bioengineering, University of Ulsan, Daehak-ro 102, Nam-gu, Ulsan 680-749, South Korea 2 Department of Physics and Energy Harvest-Storage Research Center, University of Ulsan, Daehak-ro 102, Nam-gu, Ulsan 680-749, South ...
Large area thin films of few-layered unfunctionalized graphene platelets are developed with fine ... more Large area thin films of few-layered unfunctionalized graphene platelets are developed with fine control over the thickness. The thin films are obtained by a Langmuir-Blodgett assembly at the interface of graphene solution in N-methyl-2-pyrrolidone (NMP) and water, and their optoelectronic properties and conduction mechanism are investigated in relation to lateral flake size and thin film thickness. The electrical conductivity and carrier mobility are affected by the flake size (200 nm to 1 μm) and by the packing of the nanostructure platelet network. General effective medium theory is used to explain the thickness dependent conductivity and to determine the percolation threshold film thickness which was found to be about 10 nm (at a volume fraction of ~39%) for a Langmuir-Blodgett film of an average platelet lateral size of 170 ± 40 nm. The electronic behaviour of the material shows more similarities with polycrystalline turbostratic graphite than thin films of reduced graphene oxide, carbon nanotubes, or disordered conducting polymers. While in these systems the conduction mechanism is often dominated by the presence of an energy barrier between conductive and non-conductive regions in the network, in the exfoliated graphene networks the conduction mechanism can be explained by the simple two-band model which is characteristic of polycrystalline graphite.
We report a solution-processed gas sensor based on vertically aligned ZnO nanorods (NRs) on a che... more We report a solution-processed gas sensor based on vertically aligned ZnO nanorods (NRs) on a chemically converted graphene (CCG) film. The prepared sensor device effectively detected 2ppm of H2S in oxygen at room temperature. A high sensitivity of the gas sensor ...
Temperature-dependent photoluminescence (PL) of graphene oxide (GO) reduced with hydrazine and he... more Temperature-dependent photoluminescence (PL) of graphene oxide (GO) reduced with hydrazine and heat has been measured to investigate the effect of reduction type on the bandgap of the reduced GO. Nitrogen functionalities formed in the hydrazine-treated GO were responsible for a strong localization of carriers that caused in a fluctuation in PL peak position with temperature. The intensity of C-OH peak was relatively low in the heat-treated GO, indicating that raising temperature facilitated the removal of hydroxyl groups, resulting in larger sp2 domain size and smaller bandgap energy.
We report a device that combines indium tin oxide (ITO) nanodot nodes with two-dimensional chemic... more We report a device that combines indium tin oxide (ITO) nanodot nodes with two-dimensional chemically converted graphene (CCG) films to yield a GaN-based light emitting diode (LED) with interesting characteristics for transparent and current spreading electrodes for the potential use in the ultraviolet region. The current-voltage characteristics and electroluminescence output power performance showed that CCG network on ITO nanodot nodes operated as a transparent and current spreading electrode in LED devices.
Photoluminescence (PL) and Raman studies have been performed to investigate the optical propertie... more Photoluminescence (PL) and Raman studies have been performed to investigate the optical properties of graphene thin films prepared by chemical and thermal reductions of graphene oxide (GO). The G peak in Raman spectra red-shifted after reduction of GO. Thermal ...
TiO2 films were successfully deposited onto hot quartz substrates by airbrush spraying using an a... more TiO2 films were successfully deposited onto hot quartz substrates by airbrush spraying using an aqueous dispersion. The films consisting of cubic or cauliflower-shaped structures expressed higher photodegradation efficiencies of methylene blue than those with prism-, ...
We present PROPO-an experimental expert system using probability-possibility transformation for p... more We present PROPO-an experimental expert system using probability-possibility transformation for pulmonary tuberculosis diagnosis. We describe a transformation between the probabilistic logic and the possibilistic logic as a suitable reasoning engine for medical expert systems. Further more, a structure of the system including knowledge base and inference of the system is proposed. An example of performance of the system testing the knowledge base on pulmonary tuberculosis diagnosis is illustrated.
Two types of co-operatives can be distinguished in Hanoi: transformed co-operatives and newly est... more Two types of co-operatives can be distinguished in Hanoi: transformed co-operatives and newly established co-operatives. Transformed co-operatives are the old-style collective co-operatives that were transformed after the adoption of the Co-operative Law in 1997. New co-operatives are those established after the new law. These two types of co-operatives have different characteristics and strategies. Transformed co- operatives are more engaged in
1 School of Chemical Engineering and Bioengineering, University of Ulsan, Daehak-ro 102, Nam-gu, ... more 1 School of Chemical Engineering and Bioengineering, University of Ulsan, Daehak-ro 102, Nam-gu, Ulsan 680-749, South Korea 2 Department of Physics and Energy Harvest-Storage Research Center, University of Ulsan, Daehak-ro 102, Nam-gu, Ulsan 680-749, South ...
Large area thin films of few-layered unfunctionalized graphene platelets are developed with fine ... more Large area thin films of few-layered unfunctionalized graphene platelets are developed with fine control over the thickness. The thin films are obtained by a Langmuir-Blodgett assembly at the interface of graphene solution in N-methyl-2-pyrrolidone (NMP) and water, and their optoelectronic properties and conduction mechanism are investigated in relation to lateral flake size and thin film thickness. The electrical conductivity and carrier mobility are affected by the flake size (200 nm to 1 μm) and by the packing of the nanostructure platelet network. General effective medium theory is used to explain the thickness dependent conductivity and to determine the percolation threshold film thickness which was found to be about 10 nm (at a volume fraction of ~39%) for a Langmuir-Blodgett film of an average platelet lateral size of 170 ± 40 nm. The electronic behaviour of the material shows more similarities with polycrystalline turbostratic graphite than thin films of reduced graphene oxide, carbon nanotubes, or disordered conducting polymers. While in these systems the conduction mechanism is often dominated by the presence of an energy barrier between conductive and non-conductive regions in the network, in the exfoliated graphene networks the conduction mechanism can be explained by the simple two-band model which is characteristic of polycrystalline graphite.
We report a solution-processed gas sensor based on vertically aligned ZnO nanorods (NRs) on a che... more We report a solution-processed gas sensor based on vertically aligned ZnO nanorods (NRs) on a chemically converted graphene (CCG) film. The prepared sensor device effectively detected 2ppm of H2S in oxygen at room temperature. A high sensitivity of the gas sensor ...
Temperature-dependent photoluminescence (PL) of graphene oxide (GO) reduced with hydrazine and he... more Temperature-dependent photoluminescence (PL) of graphene oxide (GO) reduced with hydrazine and heat has been measured to investigate the effect of reduction type on the bandgap of the reduced GO. Nitrogen functionalities formed in the hydrazine-treated GO were responsible for a strong localization of carriers that caused in a fluctuation in PL peak position with temperature. The intensity of C-OH peak was relatively low in the heat-treated GO, indicating that raising temperature facilitated the removal of hydroxyl groups, resulting in larger sp2 domain size and smaller bandgap energy.
We report a device that combines indium tin oxide (ITO) nanodot nodes with two-dimensional chemic... more We report a device that combines indium tin oxide (ITO) nanodot nodes with two-dimensional chemically converted graphene (CCG) films to yield a GaN-based light emitting diode (LED) with interesting characteristics for transparent and current spreading electrodes for the potential use in the ultraviolet region. The current-voltage characteristics and electroluminescence output power performance showed that CCG network on ITO nanodot nodes operated as a transparent and current spreading electrode in LED devices.
Photoluminescence (PL) and Raman studies have been performed to investigate the optical propertie... more Photoluminescence (PL) and Raman studies have been performed to investigate the optical properties of graphene thin films prepared by chemical and thermal reductions of graphene oxide (GO). The G peak in Raman spectra red-shifted after reduction of GO. Thermal ...
TiO2 films were successfully deposited onto hot quartz substrates by airbrush spraying using an a... more TiO2 films were successfully deposited onto hot quartz substrates by airbrush spraying using an aqueous dispersion. The films consisting of cubic or cauliflower-shaped structures expressed higher photodegradation efficiencies of methylene blue than those with prism-, ...
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