BA Models Research Articles

A comprehensive multi-local-world model for complex networks

The nodes in a community within a network are much more connected to each other than to the others outside the community in the same network. This phenomenon has been commonly observed from many real-world networks, ranging from social to biological even to technical networks. Meanwhile, the number of communities in some real-world networks, such as the Internet and most social networks, are evolving with time. To model this kind of networks, the present Letter proposes a multi-local-world (MLW) model to capture and describe their essential topological properties. Based on the mean-field theory, the degree distribution of this model is obtained analytically, showing that the generated network has a novel topological feature as being not completely random nor completely scale-free but behaving somewhere between them. As a typical application, the MLW model is applied to characterize the Internet against some other models such as the BA, GBA, Fitness and HOT models, demonstrating the superiority of the new model.

The online learning environment—A new model using social constructivism and the concept of ‘Ba’ as a theoretical framework

Organisations that provide education are businesses and, as such, are not immune from the impact that the Internet has had in recent years, both on the way organisations conduct their business and as a business supporting technology. Indeed, the use of the Internet as a facilitating mechanism for educational course delivery has been growing steadily over the last 5–8 years and, although there are some significant issues that have arisen in that time in relation to the quality of learning that can be achieved, there is no doubt that it will continue to be developed as an educational tool. The real issue for educators is, therefore, not whether the Internet will be used in course delivery, or if it is a useful tool, but rather how can a teacher make best use of it to enhance learning? This article documents a study that has analysed five years of student reflections on the scaffolding mechanisms used to promote and encourage learning in five Internet-based courses at the University of Queensland run between 2001 and 2005. The courses involved include three Internet-delivered Masters coursework courses and two Internet-delivered undergraduate courses in three different discipline areas. The outcomes of the study are: (1) a Report Card documenting student evaluations of the scaffolding mechanisms used; (2) a What, Why, How, Where framework of scaffolding mechanisms that are best suited to enabling deep learning through the online environment, and (3) a proposed new model of knowledge acquisition in online learning environments entitled ESCIE, which is based on Nonaka’s SECI and Ba models of knowledge creation.

You Can't Always Get What You Want: Educational Attainment, Agency, and Choice.

Using educational attainment to indicate socioeconomic status, the authors examined models of agency and effects of choice among European American adults of different educational backgrounds in 3 studies. Whereas college-educated (BA) participants and their preferred cultural products (i.e., rock music lyrics) emphasized expressing uniqueness, controlling environments, and influencing others, less educated (HS) participants and their preferred cultural products (i.e., country music lyrics) emphasized maintaining integrity, adjusting selves, and resisting influence. Reflecting these models of agency, HS and BA participants differently responded to choice in dissonance and reactance paradigms: BA participants liked chosen objects more than unchosen objects, but choice did not affect HS participants' preferences. Results suggest that HS and BA models of agency qualitatively differ, despite overlap between HS and BA worlds.

Unified approach to Thermodynamic Bethe Ansatz and finite size corrections for lattice models and field theories

We present a unified approach to the Thermodynamic Bethe Ansatz (TBA) for magnetic chains and field theories that includes the finite size (and zero-temperature) calculations for lattice BA models. In all cases, the free energy follows by quadratures from the solution of a single nonlinear integral equation (NLIE) (a system of NLIE appears for nested BA). We derive the NLIE for: (a) the six-vertex model with twisted boundary conditions, (b) the XXZ chain in an external magnetic field h z and (c) the massive Thirring sine-Gordon model (mT-sG) in a periodic box of size β ≡ T -1 using the light-cone approach. This NLIE is solved by iteration in one regime (high T in the XXZ chain and low T in the sG-mT model). In the opposite (conformal) regime, the leading behaviors are obtained in closed form. Higher corrections can be derived from the Riemann-Hilbert form of the NLIE that we present.