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      저자 : Dinesh K. V. N. (검색결과 2 건)
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        Automatic Extraction of Vertebral Endplates from Scoliotic Radiographs Using Customized Filter

        Anitha H.,Karunakar A. K.,Dinesh K. V. N. 대한의용생체공학회 2014 Biomedical Engineering Letters (BMEL) Vol.4 No.2

        Purpose The scoliosis diagnosing system needs radio-graphicinformation in terms of spinal curvature estimated usingCobb’s definition. The evaluation process and treatmentanalysis depends on the reliability and reproducibility of thespine curvature in the frontal view. Methods Manual identification of end vertebrae and otheranatomical features required for the estimation of spinalcurvature causes variability and unreliability at higher rate. This paper proposes an automated system to extract therequired anatomical features using customized filter. Thecustomized filter used in this paper is a combination ofanisotropic, sigmoid and differential filter. Combination ofthese filters automatically extracts the anatomical features interms of required vertebral endplates. Automatic identificationof these endplates eliminates the human intervention involvedin the quantification of Cobb angle. Results and Conclusions Analysis of the results revealssignificant difference between the observer variabilitybetween manual, computer assisted and computerized imageunderstanding system in terms of inter and intra crosscorrelation coefficient ratio (ICCR).

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        Drastic photocatalytic degradation of methylene blue dye by neodymium doped zirconium oxide as photocatalyst under visible light irradiation

        Dhandapani, C.,Narayanasamy, R.,Karthick, S.N.,Hemalatha, K.V.,Selvam, S.,Hemalatha, P.,kumar, M. Suresh,Kirupha, S. Dinesh,Kim, Hee-Je Elsevier 2016 OPTIK -STUTTGART- Vol.127 No.22

        <P><B>Abstract</B></P> <P>Nanocrystalline ZrO<SUB>2</SUB> and neodymium doped ZrO<SUB>2</SUB> (Nd–ZrO<SUB>2</SUB>) were successfully prepared by a polymer- assisted, sol-gel method and characterized by XRD, SEM, HRTEM, XPS and UV–vis techniques. X-Ray diffraction studies revealed the formation of highly crystalline structures of ZrO<SUB>2</SUB> and (Nd–ZrO<SUB>2</SUB>) samples. SEM images proved the evenly distributed nano - structured, spherically - shaped ZrO<SUB>2</SUB> particles of size 40nm, which was reduced to 20nm, when doped with neodymium. Light absorption properties of the nanoparticles were studied by UV–vis spectrophotometer. Nd - doped ZrO<SUB>2</SUB> was having a band gap of 2.8ev, while that of ZrO<SUB>2</SUB>, was 2.6ev. Thus, Nd substituted ZrO<SUB>2</SUB> effected substantial shifting of the absorption edge of zirconium oxide to red and resulting in the enhancement of visible light absorption The increase in band gap of Nd–ZrO<SUB>2</SUB> was resulted in an increasing light absorbtion tendency of Nd−ZrO<SUB>2</SUB>, which promoted the photocatalytic efficiency of it. XPS results confirmed substitution of Nd in ZrO<SUB>2</SUB>. Photocatalytic results for the degradation of methylene blue had indicated the fact that neodymium substitution dramatically enhanced the catalytic activity of zirconium oxide. This means that the neodymium − substituted zirconium oxide has the highest photocatalytic activity under visible light irradiation.</P>

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