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Extended Schemes for Visual Cryptography
, 1995
"... An extended visual cryptography scheme, (\Gamma Qual ; \Gamma Forb ; m)EVCS for short, with pixel "expansion" m, for an access structure (\Gamma Qual ; \Gamma Forb ) on a set of n participants, is a technique to encode n innocent looking images in such a way that when we stack together th ..."
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Cited by 32 (6 self)
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An extended visual cryptography scheme, (\Gamma Qual ; \Gamma Forb ; m)EVCS for short, with pixel "expansion" m, for an access structure (\Gamma Qual ; \Gamma Forb ) on a set of n participants, is a technique to encode n innocent looking images in such a way that when we stack together
Extended Capabilities for Visual Cryptography
, 1999
"... An extended visual cryptography scheme, EVCS for short, for an access structure (\Gamma Qual ; \Gamma Forb ) on a set of n participants, is a technique to encode n images in such a way that when we stack together the transparencies associated to participants in any set X 2 \Gamma Qual we get the sec ..."
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Cited by 45 (0 self)
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An extended visual cryptography scheme, EVCS for short, for an access structure (\Gamma Qual ; \Gamma Forb ) on a set of n participants, is a technique to encode n images in such a way that when we stack together the transparencies associated to participants in any set X 2 \Gamma Qual we get
A Finite Relation Algebra with Undecidable Network Satisfaction Problem
, 1999
"... We define a finite relation algebra and show that the network satisfaction problem is undecidable for this algebra 1 . Keywords: Network satisfaction problem, relation algebra, undecidability, tiling 1 Notation and Definitions Let A = (A; +; \Gamma; 0; 1; 1 0 ;; ; ) be a relation algebra (see ..."
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Cited by 6 (2 self)
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We define a finite relation algebra and show that the network satisfaction problem is undecidable for this algebra 1 . Keywords: Network satisfaction problem, relation algebra, undecidability, tiling 1 Notation and Definitions Let A = (A; +; \Gamma; 0; 1; 1 0 ;; ; ) be a relation algebra (see
The Nature Conservancy
"... Global biodiversity is in decline. This is of concern for aesthetic and ethical reasons, but possibly also for practical reasons, as suggested by experimental studies, mostly with plants, showing that biodiversity reductions in small study plots can lead to compromised ecosystem function. However, ..."
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18), and it is tempting to assume that a global decline in biodiversity is necessarily accompanied by declines at smaller spatial scales. However, this is not a logical inevitability because, unlike other key variables involved in global environmental change, biodiversity at large scales (often termed gamma diversity