Results 1 - 10 of 1,410

Volumetric Obscurance

by Bradford James Loos, Peter-pike Sloan
"... Obscurance and Ambient Occlusion (AO) are popular techniques in both film and games that model how ambient light is shadowed. While it is largely a solved problem for static scenes, for dynamic scenes it is still difficult to compute at interactive rates. Recent attempts to compute AO in screen spac ..."
Abstract - Cited by 16 (1 self) - Add to MetaCart
Obscurance and Ambient Occlusion (AO) are popular techniques in both film and games that model how ambient light is shadowed. While it is largely a solved problem for static scenes, for dynamic scenes it is still difficult to compute at interactive rates. Recent attempts to compute AO in screen

An Empirical Study of Algorithms for Point Feature Label Placement

by Jon Christensen, Joe Marks, Stuart Shieber , 1994
"... A major factor affecting the clarity of graphical displays that include text labels is the degree to which labels obscure display features (including other labels) as a result of spatial overlap. Point-feature label placement (PFLP) is the problem of placing text labels adjacent to point features on ..."
Abstract - Cited by 160 (8 self) - Add to MetaCart
A major factor affecting the clarity of graphical displays that include text labels is the degree to which labels obscure display features (including other labels) as a result of spatial overlap. Point-feature label placement (PFLP) is the problem of placing text labels adjacent to point features

Classification of tilings of the 2-dimensional sphere by congruent triangles

by Yukako Ueno, Yoshio Agaoka - Hiroshima Math. J , 2002
"... We give a new classification of tilings of the 2-dimensional sphere by congruent triangles accompanied with a complete proof. This accomplishes the old classification by Davies, who only gave an outline of the proof, regrettably with some redundant tilings. We clarify Davies ’ obscure points, give a ..."
Abstract - Cited by 16 (0 self) - Add to MetaCart
We give a new classification of tilings of the 2-dimensional sphere by congruent triangles accompanied with a complete proof. This accomplishes the old classification by Davies, who only gave an outline of the proof, regrettably with some redundant tilings. We clarify Davies ’ obscure points, give

Some new indexes of cluster validity

by James C. Bezdek, Nikhil R. Pal - IEEE Trasactions on Systems, Man, and Cybernetics , 1998
"... Abstract—We review two clustering algorithms (hard c-means and single linkage) and three indexes of crisp cluster validity (Hu-bert’s statistics, the Davies–Bouldin index, and Dunn’s index). We illustrate two deficiencies of Dunn’s index which make it overly sensitive to noisy clusters and propose s ..."
Abstract - Cited by 169 (0 self) - Add to MetaCart
Abstract—We review two clustering algorithms (hard c-means and single linkage) and three indexes of crisp cluster validity (Hu-bert’s statistics, the Davies–Bouldin index, and Dunn’s index). We illustrate two deficiencies of Dunn’s index which make it overly sensitive to noisy clusters and propose

Semantic Domains

by C. A. Gunter, D. S. Scott , 1990
"... this report started working on denotational semantics in collaboration with Christopher Strachey. In order to fix some mathematical precision, he took over some definitions of recursion theorists such as Kleene, Nerode, Davis, and Platek and gave an approach to a simple type theory of higher-type fu ..."
Abstract - Cited by 166 (7 self) - Add to MetaCart
this report started working on denotational semantics in collaboration with Christopher Strachey. In order to fix some mathematical precision, he took over some definitions of recursion theorists such as Kleene, Nerode, Davis, and Platek and gave an approach to a simple type theory of higher

Dust obscuration of DLA galaxies

by P. R. Williams, C. Shu, B. Ménard, Giovanni Vladilo , 2005
"... Abstract. We show that the extinction of quasar absorbers increases exponentially with the logarithmic column density of any volatile metal (e.g. zinc), with a charateristic turning point above which the quasars are severely dimmed. We derive the relation between extinction, HI column density (NHI), ..."
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Abstract. We show that the extinction of quasar absorbers increases exponentially with the logarithmic column density of any volatile metal (e.g. zinc), with a charateristic turning point above which the quasars are severely dimmed. We derive the relation between extinction, HI column density (NHI

Resolving the obscuring torus in

by David Raban, Walter Jaffe, Huub Röttgering, Klaus Meisenheimer, Konrad R. W. Tristram , 901
"... We present new interferometric data obtained with MIDI (MID infrared Interferometric instrument) for the Seyfert II galaxy NGC 1068, with an extensive coverage of sixteen uv points. These observations resolve the nuclear mid-infrared emission from NGC 1068 in unprecedented detail with a maximum reso ..."
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We present new interferometric data obtained with MIDI (MID infrared Interferometric instrument) for the Seyfert II galaxy NGC 1068, with an extensive coverage of sixteen uv points. These observations resolve the nuclear mid-infrared emission from NGC 1068 in unprecedented detail with a maximum

Scalable Ambient Obscurance

by C. Dachsbacher, J. Munkberg, J. Pantaleoni (editors, Morgan Mcguire, Michael Mara, David Luebke
"... Figure 1: Given a fixed time budget, our new algorithm substantially increases ambient obscurance resolution and quality over the 2011 AlchemyAO algorithm, which uses the same mathematical estimator. The resulting increased shading fidelity in this example allows the viewer to better discern shape i ..."
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Figure 1: Given a fixed time budget, our new algorithm substantially increases ambient obscurance resolution and quality over the 2011 AlchemyAO algorithm, which uses the same mathematical estimator. The resulting increased shading fidelity in this example allows the viewer to better discern shape

by congruent triangles

by Yukako Ueno, Yoshio Agaoka , 2001
"... Abstract. We give a new classification of tilings of the 2-dimensional sphere by congruent triangles accompanied with a complete proof. This accomplishes the old classification by Davies, who only gave an outline of the proof, regrettably with some redundant tilings. We clarify Davies ’ obscure poin ..."
Abstract - Add to MetaCart
Abstract. We give a new classification of tilings of the 2-dimensional sphere by congruent triangles accompanied with a complete proof. This accomplishes the old classification by Davies, who only gave an outline of the proof, regrettably with some redundant tilings. We clarify Davies ’ obscure

FOUR DIMENSIONAL STRING/STRING/STRING Triality

by M. J. Duff, James T. Liu, J. Rahmfeld , 1995
"... In six spacetime dimensions, the heterotic string is dual to a Type IIA string. On further toroidal compactification to four spacetime dimensions, the heterotic string acquires an SL(2, Z)S strong/weak coupling duality and an SL(2, Z)T × SL(2, Z)U target space duality acting on the dilaton/axion, co ..."
Abstract - Cited by 135 (21 self) - Add to MetaCart
/axion, complex Kahler form and the complex structure fields S, T, U respectively. Strong/weak duality in D = 6 interchanges the roles of S and T in D = 4 yielding a Type IIA string with fields T, S, U. This suggests the existence of a third string (whose six-dimensional interpretation is more obscure
Results 1 - 10 of 1,410