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

Cílem tohoto článku je rozvinout nové chápání genderu jako rutinního výkonu zakotveného v každodenních interakcích. Činíme tak kritickým zhodnocením stávajících pohledů na pohlaví a gender a zavedením důležitého rozlišení mezi pohlavím, pohlavní kategorií a genderem. Hlavním argumentem článku je tvrzení, že uznání analytické nezávislosti těchto konceptů je zásadním krokem pro porozumění interakčnímu fungování faktu bytí genderovanou osobou ve společnosti. Jádro našich poznámek míří k teoretické rekonceptualizaci, ale zvažujeme rovněž plodné směry, jimiž se na základě zmíněné reformulace může ubírat empirický výzkum

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