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SPHERICAL NEWTON DISTANCE FOR OSCILLATORY INTEGRALS WITH HOMOGENEOUS PHASE FUNCTIONS
조규동,이상현,류철우,서영자 호남수학회 2011 호남수학학술지 Vol.33 No.1
In this paper we study oscillatory integrals with analytic homogeneous phase functions for smooth radial functions. We give their sharp asymptotic behavior in terms of spherical Newton distance.
윤권하,유종현,정창원,류철우,김영조,권영만,박미란,조승룡,천권수 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.12
X-ray phase-contrast imaging can provide images with much greater soft-tissue contrast thanconventional absorption-based images. In this paper, we describe differential X-ray phase-contrastimages of insect specimens that were obtained using a grating-based Talbot interferometer and alaboratory X-ray source with a spot size of a few tens of micrometers. We developed the interferometeron the basis of the wavelength, periods, and height of the gratings; the field of view depends onthe size of the grating, considering the refractive index of the specimen. The phase-contrast imageswere acquired using phase-stepping methods. The phase contrast imaging provided a significantlyenhanced soft-tissue contrast compared with the attenuation data. The contour of the sample wasclearly visible because the refraction from the edges of the object was strong in the differentialphase-contrast image. Our results demonstrate that a grating-based Talbot interferometer with aconventional X-ray tube may be attractive as an X-ray imaging system for generating phase images. X-ray phase imaging obviously has sufficient potential and is expected to soon be a great tool formedical diagnostics.