E-definitions: Review, rethink and redefine

E-business and e-commerce are commonly used to describe business ventures and activities that make use of computing and telecommunication technologies, especially those related to the use of the Internet. However, despite widespread use of these terms, there are no generally accepted definitions of them.This paper reviews contemporary definitions of e-business and e-commerce and examines problems of these definitions.A new valuecentric approach is proposed to redefine e-business and e-commerce.Examples of e-business and e-commerce organizations are provided to illustrate this new approach.Implications of the new approach to practitioners and potential research opportunities based on the new approach are discussed

Managing ICT costs in e-commerce organizations with the time-driven activity-based costing model: a note

As online business activities continue to grow, it is important for organizations to understand the implications of being an e-commerce organization and the appropriateness of applying existing business techniques to e-commerce organizations. This paper examines issues in managing information and communication technologies (ICT) costs in e-commerce organizations and the potentials of the Time-Driven Activity-Based Costing (TDABC) model as a solution to these issues. The reliance on ICT in value creation, the unique natures of ICT costs and the need to maintain updated costing models present new challenges to e-commerce organizations in management of ICT costs. The TDABC model, as a variant of the Activity-Based Costing (ABC) model, inherits the strengths of activity-based paradigm and has unique features that can provide additional benefits to e-commerce organizations

Can consumer-led mental health services be equally effective? An integrative review of CLMH services in high-income countries

This study examined the evidence from controlled studies for the effectiveness of consumer-led mental health services. Following an extensive search of material published in English from 1980, predefined inclusion criteria were systematically applied to research articles that compared a consumer-led mental health service to a traditional mental health service. A total of 29 eligible studies were appraised; all of them were conducted in high-income countries. Overall consumer-led services reported equally positive outcomes for their clients as traditional services, particularly for practical outcomes such as employment or living arrangements, and in reducing hospitalizations and thus the cost of services. Involving consumers in service delivery appears to provide employment opportunities and be beneficial overall for the consumer-staff members and the service. Despite growing evidence of effectiveness, barriers such as underfunding continue to limit the use and evaluation of consumer-led services. Future studies need to adopt more uniform definitions and prioritize the inclusion of recovery oriented outcome measures. © Springer Science+Business Media, LLC 2010.postprin

Intrinsic Spin Hall Effect in the presence of Extrinsic Spin-Orbit Scattering

Intrinsic and extrinsic spin Hall effects are considered together on an equal theoretical footing for the Rashba spin-orbit coupling in two-dimensional (2D) electron and hole systems, using the diagrammatic method for calculating the spin Hall conductivity. Our analytic theory for the 2D holes shows the expected lowest-order additive result for the spin Hall conductivity. But, the 2D electrons manifest a very surprising result, exhibiting a non-analyticity in the Rashba coupling strength $\alpha$ where the strictly extrinsic spin Hall conductivity (for $\alpha = 0$) cannot be recovered from the $\alpha \to 0$ limit of the combined theory. The theoretical results are discussed in the context of existing experimental results.Comment: 5 pages, 2 figure

Pick, mix or match? A discussion of theories for management accounting research

This paper presents a review on applications of four types of theories for management accounting (MA) research (contingency theory, agency theory, sociological theories and psychological theories) and comments on prospects of combining multiple theories in future MA research. Based on a review of studies that adopted the four types of theories, the authors argue that multiple theories can be applied jointly in future research to enrich our understandings on MA practices from multiple perspectives. However, theories should maintain their distinctiveness in their applications. Blending multiple theories into a single all-purpose theory can be counterproductive due to loss of explanatory power.<br /

Spin Hall Effect in Doped Semiconductor Structures

In this Letter we present a microscopic theory of the extrinsic spin Hall effect based on the diagrammatic perturbation theory. Side-jump (SJ) and skew-scattering (SS) contributions are explicitly taken into account to calculate the spin Hall conductivity, and we show their effects scale as $\sigma_{xy}^{SJ}/\sigma_{xy}^{SS} \sim (\hbar/\tau)/\epsilon_F$, with $\tau$ being the transport relaxation time. Motivated by recent experimental work we apply our theory to n- and p-doped 3D and 2D GaAs structures, obtaining $\sigma_s/\sigma_c \sim 10^{-3}-10^{-4}$ where $\sigma_{s(c)}$ is the spin Hall (charge) conductivity, which is in reasonable agreement with the recent experimental results of Kato \textit{et al}. [Science \textbf{306}, 1910 (2004)] in n-doped 3D GaAs system.Comment: 5 pages, 2 figure

Molecular Dynamics Computer Simulation of the Dynamics of Supercooled Silica

We present the results of a large scale computer simulation of supercooled silica. We find that at high temperatures the diffusion constants show a non-Arrhenius temperature dependence whereas at low temperature this dependence is also compatible with an Arrhenius law. We demonstrate that at low temperatures the intermediate scattering function shows a two-step relaxation behavior and that it obeys the time temperature superposition principle. We also discuss the wave-vector dependence of the nonergodicity parameter and the time and temperature dependence of the non-Gaussian parameter.Comment: 5 pages, Latex, 6 postscript figure

A lower bound for interval routing in general networks

Includes bibliographical references (p. 11).At head of title: Computer science publication.Cover title.published_or_final_versio