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Fault Diagnosis Based on Likelihood Decomposition
Katsuji Uosaki,Tetsuo Kagawa 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
A novel fault diagnosis method based on likelihood decomposition is proposed for linear stochastic systems described by autoregressive (AR) model. Assuming that at some time instant γ the fault of one of the following two types is occurs: innovation fault (actuator fault); and observation fault (sensor fault), the log-likelihood function is decomposed into two components based on the observations before and after γ, respectively, Then, the type of the fault is determined by comparing the log-likelihoods corresponding two types of faults. Numerical examples demonstrate the usefulness of the proposed diagnosis method.
Kim, Young-Ho,Uosaki, Kohei The Korean Electrochemical Society 2013 Journal of electrochemical science and technology Vol.4 No.4
Tantalum anodic oxide film was prepared in citric acid solution of various concentrations and the prepared Ta anodic oxide film was characterized by various electrochemical techniques and X-ray photoelectron spectroscopy (XPS). The prepared Ta anodic oxide film showed typical n-type semiconducting properties and the dielectric properties were strongly dependent on the citric acid concentration. The variation of electrochemical and electronic properties was explained in terms of electrolyte anion incorporation into the anodic oxide film, which was supported by XPS measurements.
Porous gold nanodisks with multiple internal hot spots
Wi, Jung-Sub,Tominaka, Satoshi,Uosaki, Kohei,Nagao, Tadaaki The Royal Society of Chemistry 2012 Physical chemistry chemical physics Vol.14 No.25
<P>For increasing the number of internal hot spots in the individual plasmonic nanoparticles, porous Au nanostructures were synthesized by a hybrid approach combining a physical process, which defined the overall shapes and dimensions of the nanostructures, and a chemical process, which incorporated nanopores inside the patterned nanostructures. This approach allows us to synthesize lithographically designed Au nanodisks containing numerous internal Raman hot spots in the form of nanopores. The increased number of hot spots successfully improved SERS intensity, and this experimental result was further elucidated by numerical electromagnetic simulations. The highly improved and homogeneous SERS intensities illustrate the great potential of the porous plasmonic nanodisks as a sensitive molecular imaging agent.</P> <P>Graphic Abstract</P><P>Porous plasmonic nanostructures with enhanced SERS activity can be synthesized by incorporating chemically formed nanopores into physically fabricated nanostructures. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp40578d'> </P>