Results 1 - 10 of 5,101

On Mutually-Exclusive Roles and Separation of

by Ninghui Li, Mahesh V. Tripunitara, Ziad Bizri
"... Separation of Duty (SoD) is widely considered to be a fundamental principle in computer security. A Static SoD (SSoD) policy states that in order to have all permissions necessary to complete a sensitive task, the cooperation of at least a certain number of users is required. Role-Based Access Contr ..."
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Control (RBAC) is today’s dominant access control model. It is widely believed that one of RBAC’s main strengths is that it enables the use of constraints to support policies such as Separation of Duty. In RBAC Statically Mutually Exclusive Roles (SMER) constraints are used to enforce SSoD policies

ON MUTUALLY-EXCLUSIVE ROLES AND SEPARATION OF DUTY

by Ninghui Li, Ziad Bizri, Mahesh V. Tripunitara , 2004
"... Separation of Duty (SoD) is widely considered to be a fundamental principle in computer security. A Static SoD (SSoD) policy states that in order to have all permissions necessary to complete a sensitive task, the cooperation of at least a certain number of users is required. In Role-Based Access Co ..."
Abstract - Cited by 24 (7 self) - Add to MetaCart
Control (RBAC), Statically Mutually Exclusive Roles (SMER) constraints are used to enforce SSoD policies. In this paper, we pose and answer fundamental questions related to the use of SMER constraints to enforce SSoD policies. We show that directly enforcing SSoD policies is intractable (co

The serial cultivation of human diploid cell strains. Exp Cell Res

by L. Hayflick, P. S. Moorhead , 1961
"... ONLY limited success has been obtained in developing strains of human cells that can be cultivated for long periods of time in vitro and that still preserve the diploid chromosomal configuration [41, 47, 48, 58, 591. Indeed, heteroploidy may be a necessary corollary or even the cause of the altera-t ..."
Abstract - Cited by 497 (2 self) - Add to MetaCart
hundred have been reported in the literature, have serious limitations for many kinds of biological studies. Chief among these is the exclusion of their use for the production of human virus vaccines. This limitation is based on the supposition that such hetero-ploid cell lines, whether of normal

RESEARCH ARTICLE Mutually Exclusive Roles of SHARPIN in

by Integrin Inactivation, Nf-κb Signaling, Nicola De Franceschi, Emilia Peuhu, Maddy Parsons, Sami Rissanen
"... SHANK-associated RH domain interactor (SHARPIN) inhibits integrins through interaction with the integrin α-subunit. In addition, SHARPIN enhances nuclear factor-kappaB (NF-κB) activity as a component of the linear ubiquitin chain assembly complex (LUBAC). However, it is currently unclear how regulat ..."
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regulation of these seemingly different roles is coordinated. Here, we show that SHARPIN binds integrin and LUBAC in a mutually exclusive manner. We map the integrin binding site on SHARPIN to the ubiquitin-like (UBL) domain, the same domain implicated in SHARPIN interaction with LUBAC component RNF31 (ring

exclusion

by Jean-louis Arcand, Natascha Wagner
"... Using unique village census data collected in 2003 and 2008 in Senegal, we assess the impact of a major World Bank-funded Community Driven Development (CDD) program on membership and assortative matching in community-based organizations (CBOs). We implement both standard discrete choice and dyadic r ..."
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membership is reduced in treated villages, with significant differences between men and women. Our results suggest that grassroots level development projects which target CBOs must be carefully designed and executed if they are not to result, paradoxically, in a greater degree of social exclusion

Elementary Gates for Quantum Computation

by Adriano Barenco , Charles H. Bennett, Richard Cleve, David P. DiVincenzo, Norman Margolus, Peter Shor, Tycho Sleator, John Smolin, Harald Weinfurter , 1995
"... We show that a set of gates that consists of all one-bit quantum gates (U(2)) and the two-bit exclusive-or gate (that maps Boolean values (x, y)to(x, x⊕y)) is universal in the sense that all unitary operations on arbitrarily many bits n (U(2 n)) can be expressed as compositions of these gates. We in ..."
Abstract - Cited by 280 (11 self) - Add to MetaCart
We show that a set of gates that consists of all one-bit quantum gates (U(2)) and the two-bit exclusive-or gate (that maps Boolean values (x, y)to(x, x⊕y)) is universal in the sense that all unitary operations on arbitrarily many bits n (U(2 n)) can be expressed as compositions of these gates. We

Developments in the Measurement of Subjective Well-Being

by Daniel Kahneman , Alan B Krueger - Psychological Science. , 1993
"... F or good reasons, economists have had a long-standing preference for studying peoples' revealed preferences; that is, looking at individuals' actual choices and decisions rather than their stated intentions or subjective reports of likes and dislikes. Yet people often make choices that b ..."
Abstract - Cited by 284 (7 self) - Add to MetaCart
of others and depart from the standard model of the rational economic agent in other ways. If people display bounded rationality when it comes to maximizing utility, then their choices do not necessarily reflect their "true" preferences, and an exclusive reliance on choices to infer what people

Pricing in computer networks: Motivation, formulation, and example

by Ron Cocchi, Scott Shenker, Deborah Estrin, Lixia Zhang - IEEE/ACM TRANSACTIONS ON NETWORKING , 1993
"... We study the role of pricing policies in multiple service class networks. We first argue that some form of serviceclass sensitive pricing is required for any multiclass service discipline ’ to attain the desired level of performance. Borrowing heavily from the Nash implementation paradigm in econom ..."
Abstract - Cited by 234 (3 self) - Add to MetaCart
We study the role of pricing policies in multiple service class networks. We first argue that some form of serviceclass sensitive pricing is required for any multiclass service discipline ’ to attain the desired level of performance. Borrowing heavily from the Nash implementation paradigm

INSTITUTIONS DON’T RULE: DIRECT EFFECTS OF GEOGRAPHY ON PER CAPITA INCOME

by Jeffrey D. Sachs , 2003
"... In a series of papers, my colleagues and I have demonstrated that levels of per capita income, economic growth, and other economic and demographic dimensions are strongly correlated with geographical and ecological variables such as climate zone, disease ecology, and distance from the coast. Three r ..."
Abstract - Cited by 212 (2 self) - Add to MetaCart
recent papers purport to show that the role of geography in explaining cross-country patterns of income per capita operates predominantly or exclusively through the choice of institutions, with little direct effect of geography on income after controlling for the quality institutions. This note shows

Extending Object-Oriented Systems with Roles

by Georg Gottlob, Michael Schrefl, Brigitte Röck - ACM TRANSACTIONS ON INFORMATION SYSTEMS , 1994
"... In many class-based object-oriented systems the association between an instance and a class is exclusive and permanent. Therefore these systems have serious difficulties in representing objects taking on different roles over time. Such objects must be reclassified any time they evolve (e.g., if a ..."
Abstract - Cited by 151 (0 self) - Add to MetaCart
In many class-based object-oriented systems the association between an instance and a class is exclusive and permanent. Therefore these systems have serious difficulties in representing objects taking on different roles over time. Such objects must be reclassified any time they evolve (e
Results 1 - 10 of 5,101