230 research outputs found
Evaluation of 3D Voxel Rendering Algorithms for Real-Time Interaction on a SIMD Graphics Processor
The display of three-dimensional medical data is becoming more common, but current hardware and image rendering algorithms do not generally allow real-time interaction with the image by the user. Real-time interactions, such as image rotation, utilize the motion processing capabilities of the human visual system, allowing a better understanding of the structures being imaged. Recent advances in general purpose graphics display equipment could make real-time interaction feasible in clinical setting. We have evaluated the capabilities of one type of advanced display architecture, the PIXAR Imaging Computer, for real-time interaction while displaying three-dimensional medical data as two-dimensional projections. It was discovered during this investigation that most suitable algorithms for implementation were based on the rendering of voxel rather than surface data. Two voxel-based techniques, back-to-front and front-to-back rendering produced acceptable, but not real-time performance. The quality of the images produced was not high, but allowed the determination of an image orientation which could then be used by a later high-quality rendering technique. Two conclusions were reached: first, the current performance of display hardware may allow acceptable interactive performance and produce high-quality images if a scheme of adaptive refinement is used wherein successively higher quality images are generated for the user. Second, the correct algorithm to use for fast rendering of volume data is highly dependent upon the architecture of the display processor, and in particular upon the ability of the processor to randomly access image data. If the processor is constrained to sequential or near sequential access to the voxel data, the choice of algorithms and the utilization of parallel processing is severely limited
Dělat gender
CĂlem tohoto ÄŤlánku je rozvinout novĂ© chápánĂ genderu jako rutinnĂho vĂ˝konu zakotvenĂ©ho v kaĹľdodennĂch interakcĂch. ÄŚinĂme tak kritickĂ˝m zhodnocenĂm stávajĂcĂch pohledĹŻ na pohlavĂ a gender a zavedenĂm dĹŻleĹľitĂ©ho rozlišenĂ mezi pohlavĂm, pohlavnĂ kategoriĂ a genderem. HlavnĂm argumentem ÄŤlánku je tvrzenĂ, Ĺľe uznánĂ analytickĂ© nezávislosti tÄ›chto konceptĹŻ je zásadnĂm krokem pro porozumÄ›nĂ interakÄŤnĂmu fungovánĂ faktu bytĂ genderovanou osobou ve spoleÄŤnosti. Jádro našich poznámek mĂřà k teoretickĂ© rekonceptualizaci, ale zvaĹľujeme rovněž plodnĂ© smÄ›ry, jimiĹľ se na základÄ› zmĂnÄ›nĂ© reformulace mĹŻĹľe ubĂrat empirickĂ˝ vĂ˝zkum
The Ursinus Weekly, October 21, 1971
Nat. opinion poll indicates approval of legal abortion • President Pettit approves 3rd U.S.G.A. open dorm proposal • Action-packed Homecoming slated for Saturday, October 30 • Andrew Wyeth to receive degree on Founder\u27s Day • Ursinus professors present history forum October 20th • Editorial: Sign out • Focus: Rich Hofferman • Enforced adolescence: Place on the college community? • I.R. Club hosts to model U.N. • Probable parable • Spotlight: Pauline D. Pearson • Evening School enrolls 745; Numbers down • Women enjoy freedom with extended curfew • Soccer undefeated; 2-0-2 record • Third team rolls • Feiger\u27s field goal wins for Ursinushttps://digitalcommons.ursinus.edu/weekly/1109/thumbnail.jp
Microscopic modeling of photoluminescence of strongly disordered semiconductors
A microscopic theory for the luminescence of ordered semiconductors is
modified to describe photoluminescence of strongly disordered semiconductors.
The approach includes both diagonal disorder and the many-body Coulomb
interaction. As a case study, the light emission of a correlated plasma is
investigated numerically for a one-dimensional two-band tight-binding model.
The band structure of the underlying ordered system is assumed to correspond to
either a direct or an indirect semiconductor. In particular, luminescence and
absorption spectra are computed for various levels of disorder and sample
temperature to determine thermodynamic relations, the Stokes shift, and the
radiative lifetime distribution.Comment: 35 pages, 14 figure
The Ursinus Weekly, October 12, 1972
Freshman voters elect leaders • Senator George L. Murphy to speak at convocation - dedication ceremonies • Continued false alarms may bring restrictions • Messiah\u27s annual performance slated for December 7th • Student-teachers assignments presented to seniors • Editorial: The Weekly wants you! • Student from Sri-Lanka speaks to Socratic Club • Stenzler sculpture in review: A good show • ProTheatre presents: Albee\u27s American dream • Faculty portrait: Emilio Paul • Bear Gridders win first • Harriers return to winning ways; Roll over three opponents • Aggressive play leads to victory at Goucher games • Manning takes helm; Aggression made keyhttps://digitalcommons.ursinus.edu/weekly/1087/thumbnail.jp
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