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Author Aros, R.; Contreras, M.
Title Torsion induces gravity Type
Year 2006 Publication Physical Review D Abbreviated Journal Phys. Rev. D
Volume 73 Issue 8 Pages 4 pp
Keywords
Abstract In this work the Poincare-Chern-Simons and anti-de Sitter-Chern-Simons gravities are studied. For both, a solution that can be cast as a black hole with manifest torsion is found. Those solutions resemble Schwarzschild and Schwarzschild-AdS solutions, respectively.
Address Univ Andres Bello, Dept Cinemas Fis, Santiago, Chile
Corporate Author Thesis
Publisher American Physical Soc Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1550-7998 ISBN Medium
Area Expedition Conference
Notes WOS:000237159600093 Approved
Call Number UAI @ eduardo.moreno @ Serial 43
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Author Canessa, E.; Riolo, R.L.
Title An agent-based model of the impact of computer-mediated communication on organizational culture and performance: an example of the application of complex systems analysis tools to the study of CIS Type
Year 2006 Publication Journal Of Information Technology Abbreviated Journal J. Inf. Technol.
Volume 21 Issue 4 Pages 272-283
Keywords agent-based modeling; computer-mediated communication; organizational communication; organizational culture; network stability
Abstract Organizations that make use of computer information systems (CIS) are prototypical complex adaptive systems (CAS). This paper shows how an approach from Complexity Science, exploratory agent-based modeling (ABM), can be used to study the impact of two different modes of use of computer-mediated communication (CMC) on organizational culture (OC) and performance. The ABM includes stylized representations of (a) agents communicating with other agents to complete tasks; (b) an OC consisting of the distribution of agent traits, changing as agents communicate; (c) the effect of OC on communication effectiveness (CE), and (d) the effect of CE on task completion times, that is, performance. If CMC is used in a broad mode, that is, to contact and collaborate with many, new agents, the development of a strong OC is slowed, leading to decreased CE and poorer performance early on. If CMC is used in a local mode, repeatedly contacting the same agents, a strong OC develops rapidly, leading to increased CE and high performance early on. However, if CMC is used in a broad mode over longer time periods, a strong OC can develop over a wider set of agents, leading to an OC that is stronger than an OC which develops with local CMC use. Thus broad use of CMC results in overall CE and performance that is higher than is generated by local use of CMC. We also discuss how the dynamics generated by an ABM can lead to a deeper understanding of the behavior of a CAS, for example, allowing us to better design empirical longitudinal studies.
Address Univ Adolfo Ibanez, Fac Sci & Technol, Vina Del Mar 1625, Chile, Email: ecanessa@uai.cl
Corporate Author Thesis
Publisher Palgrave Macmillan Ltd Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0268-3962 ISBN Medium
Area Expedition Conference
Notes WOS:000243393900007 Approved
Call Number UAI @ eduardo.moreno @ Serial 17
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Author de Mateo, F.; Coelli, T.; O'Donnell, C.
Title Optimal paths and costs of adjustment in dynamic DEA models: with application to chilean department stores Type
Year 2006 Publication Annals Of Operations Research Abbreviated Journal Ann. Oper. Res.
Volume 145 Issue 1 Pages 211-227
Keywords cost of adjustment; dynamic DEA; path of adjustment
Abstract In this paper we propose a range of dynamic data envelopment analysis (DEA) models which allow information on costs of adjustment to be incorporated into the DEA framework. We first specify a basic dynamic DEA model predicated on a number or simplifying assumptions. We then outline a number of extensions to this model to accommodate asymmetric adjustment costs, non-static output quantities, non-static input prices, and non-static costs of adjustment, technological change, quasi-fixed inputs and investment budget constraints. The new dynamic DEA models provide valuable extra information relative to the standard static DEA models-they identify an optimal path of adjustment for the input quantities, and provide a measure of the potential cost savings that result from recognising the costs of adjusting input quantities towards the optimal point. The new models are illustrated using data relating to a chain of 35 retail department stores in Chile. The empirical results illustrate the wealth of information that can be derived from these models, and clearly show that static models overstate potential cost savings when adjustment costs are non-zero.
Address Univ Adolfo Ibanez, Recreo, Vina Del Mar, Chile, Email: fdemateo@uai.cl
Corporate Author Thesis
Publisher Springer Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0254-5330 ISBN Medium
Area Expedition Conference
Notes WOS:000241281800014 Approved
Call Number UAI @ eduardo.moreno @ Serial 16
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Author Gajardo, A.; Goles, E.
Title Crossing information in two-dimensional Sandpiles Type
Year 2006 Publication Theoretical Computer Science Abbreviated Journal Theor. Comput. Sci.
Volume 369 Issue 1-3 Pages 463-469
Keywords Sandpile; discrete dynamical system; cellular automata; calculability; complexity
Abstract We prove that in a two-dimensional Sandpile automaton, embedded in a regular infinite planar cellular space, it is impossible to cross information, if the bit of information is the presence (or absence) of an avalanche. This proves that it is impossible to embed arbitrary logical circuits in a Sandpile through quiescent configurations. Our result applies also for the non-planar neighborhood of Moore. Nevertheless, we also show that it is possible to compute logical circuits with a two-dimensional Sandpile, if a neighborhood of radius two is used in Z(2); crossing information becomes possible in that case, and we conclude that for this neighborhood the Sandpde is P-complete and Turing universal. (c) 2006 Elsevier B.V. All rights reserved.
Address Univ Adolfo Ibanez, Santiago, Chile, Email: anahi@ing-mat.udec.cl
Corporate Author Thesis
Publisher Elsevier Science Bv Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0304-3975 ISBN Medium
Area Expedition Conference
Notes WOS:000242765000035 Approved
Call Number UAI @ eduardo.moreno @ Serial 34
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Author Hernandez, R.R.
Title Schwarzian derivatives and a linearly invariant family in c(n) Type
Year 2006 Publication Pacific Journal Of Mathematics Abbreviated Journal Pac. J. Math.
Volume 228 Issue 2 Pages 201-218
Keywords several complex varaibles; Schwarzian derivative; linearly invariant families; sturm comparison
Abstract We use Oda's definition of the Schwarzian derivative for locally univalent holomorphic maps F in several complex variables to define a Schwarzian derivative operator phi F. We use the Bergman metric to define a norm 11,vertical bar vertical bar phi F vertical bar vertical bar for this operator, which in the ball is invariant under composition with automorphisms. We study the linearly invariant family F-alpha = {F : B-n -> C-n vertical bar F(0) = 0, DF(0) = Id, vertical bar vertical bar phi F vertical bar vertical bar <= alpha}, estimating its order and norm order.
Address Univ Adolfo Ibanez, Fac Ciencias & Tecnol, Penalolen 2640, Chile, Email: rodrigo.hernandez@uai.cl
Corporate Author Thesis
Publisher Pacific Journal Mathematics Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0030-8730 ISBN Medium
Area Expedition Conference
Notes WOS:000248988600001 Approved
Call Number UAI @ eduardo.moreno @ Serial 41
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