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A Variational Framework for Image Super-Resolution and Its Applications
Todd Wittman 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.8
Image super-resolution is the process of combining multiple images into a single image that has higher resolution than any of the original images. We present a variational framework for fusing multiple co-registered images using the Total Variation (TV) and Mumford-Shah regularizations. We also propose an alternating minimization strategy for aligning and fusing multiple images in the case when the co-registration parameters are unknown. We discuss applications to video enhancement and present two novel applications to barcode scanning and Magnetic Resonance Imaging (MRI).
Benson, B.,Wittman, D. M.,Golovich, N.,Jee, M. James,van Weeren, R. J.,Dawson, W. A. American Astronomical Society 2017 The Astrophysical Journal Vol.841 No.1
<P>ZwCl 2341.1+0000, a merging galaxy cluster with disturbed X-ray morphology and widely separated (similar to 3 Mpc) double radio relics, was thought to be an extremely massive (10-30 x 10(14) M-circle dot) and complex system, with little known about its merger history. We present JVLA 2-4 GHz observations of the cluster, along with new spectroscopy from our Keck/DEIMOS survey, and apply Gaussian Mixture Modeling to the three-dimensional distribution of 227 confirmed cluster galaxies. After adopting the Bayesian Information Criterion to avoid overfitting, which we discover can bias high the total dynamical mass estimates, we find that a three-substructure model with a total dynamical mass estimate of 9.39 +/- 0.81 x 10(14) M-circle dot is favored. We also present deep Subaru imaging and perform the first weak lensing analysis on this system, obtaining a weak lensing mass estimate of 5.57 +/- 2.47 x 10(14) M-circle dot. This is a more robust estimate because it does not depend on the dynamical state of the system, which is disturbed due to the merger. Our results indicate that ZwCl 2341.1+0000 is a multiple merger system comprised of at least three substructures, with the main merger that produced the radio relics occurring near the plane of the sky, and a younger merger in the north occurring closer to the line of sight. Dynamical modeling of the main merger reproduces observed quantities (relic positions and polarizations, subcluster separation and radial velocity difference), if the merger axis angle of similar to 10(-6)(+34) degrees and the collision speed at pericenter is similar to 1900(-200)(+300) km s(-1).</P>
Finner, Kyle,Jee, M. James,Golovich, Nathan,Wittman, David,Dawson, William,Gruen, Daniel,Koekemoer, Anton M.,Lemaux, Brian C.,Seitz, Stella American Astronomical Society 2017 The Astrophysical journal Vol.851 No.1
<P>The second most significant detection of the Planck Sunyaev-Zel'dovich survey, PLCK G287.0+32.9 (z = 0.385), boasts two similarly bright radio relics and a radio halo. One radio relic is located similar to 400 kpc NW of the X-ray peak and the other similar to 2.8 Mpc to the SE. This large difference suggests that a complex merging scenario is required. A key missing puzzle for the merging scenario reconstruction is the underlying dark matter distribution in high resolution. We present a joint Subaru Telescope and Hubble Space Telescope weak-lensing analysis of the cluster. Our analysis shows that the mass distribution features four significant substructures. Of the substructures, a primary cluster of mass M-200c = 1.59(-0.22)(+0.25) x 10(15) h(70)(-1) M-circle dot dominates the weak-lensing signal. This cluster is likely to be undergoing a merger with one (or more) subcluster whose mass is approximately a factor of 10 lower. One candidate is the subcluster of mass M-200c = 1.16(-0.13)(+0.15) x 10(14) h(70)(-1) M-circle dot located similar to 400 kpc to the SE. The location of this subcluster suggests that its interaction with the primary cluster could be the source of the NW radio relic. Another subcluster is detected similar to 2 Mpc to the SE of the X-ray peak with mass M-200c =1.68(-0.20)(+0.22) x 10(14) h(70)(-1) M-circle dot. This SE subcluster is in the vicinity of the SE radio relic and may have created the SE radio relic during a past merger with the primary cluster. The fourth subcluster, M-200c = 1.87(-0.22)(+0.24) x 10(14) h(70)(-1) M-circle dot, is NW of the X-ray peak and beyond the NW radio relic.</P>
가성광견병에 관한 병리학적 연구 I. 인공감염돈의 병리조직학적 소견
Kim Soon-bok,Kwak Soo-dong,Wittman Georg,Olinger Volker 대한수의사회 1986 대한수의사회지 Vol.22 No.5
In pigs inoculated with Pseudorabies virus, clinical, anatomical and histopathological findings were observed. Nervous sings, high fever and collapse were main clinical symptoms. Anatomical findings were not prominent except swollen lymph nodes with hemor
Golovich, Nathan,Weeren, Reinout J. van,Dawson, William A.,Jee, M. James,Wittman, David American Astronomical Society 2017 The Astrophysical journal Vol.838 No.2
<P>We present and analyze a rich data set including Subaru/SuprimeCam, HST/Advanced Camera for Surveys and Wide Field Camera 3, Keck/DEIMOS, Chandra/ACIS-I, and JVLA/C and D array for the merging cluster of galaxies ZwCl 0008.8+ 5215. With a joint Subaru+ HST weak gravitational lensing analysis, we identify two dominant subclusters and estimate the masses to be M-200 = 5.8(-1.8)(+2.8) x 10(14) M-circle dot. We estimate the projected separation between the two subclusters to be 924(-206)(+243) kpc. We perform a clustering analysis of spectroscopically confirmed cluster member galaxies and estimate the line-of-sight velocity difference between the two subclusters to be 92 +/- 164 km s(-1). We further motivate, discuss, and analyze the merger scenario through an analysis of the 42 ks of Chandra/ACIS-I and JVLA/C and D array polarization data. The X-ray surface brightness profile reveals a merging gas-core reminiscent of the Bullet Cluster. The global X-ray luminosity in the 0.5-7.0 keV band is 1.7. +/- 0.1 x 10(44) erg s(-1) and the global X-ray temperature is 4.90 +/- 0.13 keV. The radio relics are polarized up to 40%,. and along with the masses, velocities, and positions of the two subclusters, we input these quantities into a Monte Carlo dynamical analysis and estimate the merger velocity at pericenter to be 1800(-300)(+400) km s(-1). This is a lower-mass version of the Bullet Cluster and therefore may prove useful in testing alternative models of dark matter (DM). We do not find significant offsets between DM and galaxies, but the uncertainties are large with the current lensing data. Furthermore, in the east, the BCG is offset from other luminous cluster galaxies, which poses a puzzle for defining DM-galaxy offsets.</P>