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Search Results: 1 - 10 of 228313 matches for " Douglas R.; "
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A Study on Communication Media Selection: Comparing the Effectiveness of the Media Richness, Social Influence, and Media Fitness  [PDF]
Rui Gu, Kunihiko Higa, Douglas R. Moodie
Journal of Service Science and Management (JSSM) , 2011, DOI: 10.4236/jssm.2011.43035
Abstract: Media selection has become a more complex problem because of the fast development of Information and Communication Technology. However, there is little quantified work on the tools for media selection decisions. The three main tools available are Media Richness Theory (MRT) [1], Social Influence Perspectives (SIP) [2], and Media Fitness Framework (MFF) [3,4]. MFF is a combination of the factors from MRT and SIP with additional factors for environmental and resource limitations. In this research, we tested the effectiveness of media selection prediction of these three tools on 72 communication tasks from 18 companies. We then compared the results to real data. This comparison showed MFF to be more effective than either MRT or SIP, particularly in multiple-media situations. MFF also had a faster convergence of media selection prediction.
Asymptotic behavior of solutions for neutral dynamic equations on time scales
Anderson Douglas R
Advances in Difference Equations , 2006,
Abstract: We investigate the boundedness and asymptotic behavior of a first-order neutral delay dynamic equation on arbitrary time scales, extending some results from difference equations.
Boundedness and vanishing of solutions for a forced delay dynamic equation
Anderson Douglas R
Advances in Difference Equations , 2006,
Abstract: We give conditions under which all solutions of a time-scale first-order nonlinear variable-delay dynamic equation with forcing term are bounded and vanish at infinity, for arbitrary time scales that are unbounded above. A nontrivial example illustrating an application of the results is provided.
STRESS AND THE CONTROL OF APOPTOSIS
Douglas R. Green
The Scientific World Journal , 2001, DOI: 10.1100/tsw.2001.189
Abstract:
Existence of solutions to higher-order discrete three-point problems
Douglas R. Anderson
Electronic Journal of Differential Equations , 2003,
Abstract: We are concerned with the higher-order discrete three-point boundary-value problem $$displaylines{ (Delta^n x)(t)=f(t,x(t+heta)), quad t_1le tle t_3-1, quad -aule hetale 1cr (Delta^i x)(t_1)=0, quad 0le ile n-4, quad nge 4 cr alpha (Delta^{n-3}x)(t)-Beta (Delta^{n-2}x)(t)=Beta(t), quad t_1-au-1le tle t_1 cr (Delta^{n-2}x)(t_2)=(Delta^{n-1}x)(t_3)=0. }$$ By placing certain restrictions on the nonlinearity and the distance between boundary points, we prove the existence of at least one solution of the boundary value problem by applying the Krasnoselskii fixed point theorem.
Oscillation and nonoscillation criteria for two-dimensional time-scale systems of first-order nonlinear dynamic equations
Douglas R. Anderson
Electronic Journal of Differential Equations , 2009,
Abstract: Oscillation criteria for two-dimensional difference and differential systems of first-order linear difference equations are generalized and extended to nonlinear dynamic equations on arbitrary time scales. This unifies and extends under one theory previous linear results from discrete and continuous systems. An example is given illustrating that a key theorem is sharp on all time scales.
Nonlinear triple-point problems on time scales
Douglas R. Anderson
Electronic Journal of Differential Equations , 2004,
Abstract: We establish the existence of multiple positive solutions to the nonlinear second-order triple-point boundary-value problem on time scales, $$displaylines{ u^{Delta abla}(t)+h(t)f(t,u(t))=0, cr u(a)=alpha u(b)+delta u^Delta(a),quad eta u(c)+gamma u^Delta(c)=0 }$$ for $tin[a,c]subsetmathbb{T}$, where $mathbb{T}$ is a time scale, $eta, gamma, deltage 0$ with $Beta+gamma>0$, $0 Keywords Fixed-point theorems --- time scales --- dynamic equations --- cone.
Discourse on the History of Archaeology
Douglas R. Givens
Bulletin of the History of Archaeology , 1991, DOI: 10.5334/bha.01102
Abstract: This space is usually reserved for an outstanding short article on some facet of research in the history of archaeology. However, with this first issue, we list the names and addresses of Associate Editors so that correspondence relating to the history of archaeology may be sent directly to Associate Editors representing various geographic regions.
Current Research
Douglas R. Givens
Bulletin of the History of Archaeology , 1991, DOI: 10.5334/bha.01103
Abstract:
Bibliographic/Archival Material Relating to the History of Archaeology
Douglas R. Givens
Bulletin of the History of Archaeology , 1991, DOI: 10.5334/bha.01104
Abstract:
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