This paper presents a model of professional development through the participation in a virtual CoP. This model is rooted in a definition of professional development and of professional practice. The model is then used for analyzing the activity of a virtual CoP of tutors involved in a computersupported collaborative learning training. The analysis provides guidelines for developing online servi...

We introduce our framework for logic-based compositional e-commerce interaction. We aim to provide opensource software which adds a light-weight formal messaging layer to business communications, to increase the accessibility of e-commerce infrastructure to smaller business players. In the process we hope to develop a comprehensive theory of business communication. We present the logical struct...

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We compute the Boundary Superstring Field Theory partition function on the annulus in the presence of independent linear tachyon profiles on the two boundaries. The R-R sector is found to contribute non-trivially to the derivative terms of the space-time effective action. In the process we construct a boundary state description of D-branes in the presence of a linear tachyon. We quantize the op...

Background This study was conducted to identify cardiac dysfunction and the relationship of hemoglobin A1c (HbA1c) levels and serum lipids to echocardiographic indices in children and adolescents with T1DM. Materials and Methods: This  case-control study was conducted on  100 cases  including 50 children and adoles...

Long-term X-ray variability of the low-luminosity active galactic nucleus of M81 was studied, using 16 ASCA observations spanning 5.5 years. The object exhibits a factor three variation over the 5.5 years. The source intensity was relatively constant within each observation which lasted typically for one day, but intra-day variability by 30% was detected on the 15th observation. The power-spect...

The concept of a preopen set in a topological space was introduced by H. H. Corson and E. Michael in 1964 [3]. A subset A of a topological space (X, τ) is called preopen or locally dense or nearly open if A ⊆ Int(Cl(A)). A set A is called preclosed if its complement is preopen or equivalently if Cl(Int(A)) ⊆ A. The term, preopen, was used for the first time by A. S. Mashhour, M. E. Abd El-Monse...

abstract this study investigates the impact of housing and non- housing investment on the iran's gross domestic production (gdp) using quarterly data from 1370-1 to 1386-4. considering that iran has an open economy and that the net export plays an important role in gdp fluctuations, this research focuses on the difference between the effects of residential and non-residential investment in open...

Objective To compare pulmonary function, functional capacity and clinical outcomes amongst three groups of patients with left ventricular dysfunction following off-pump coronary artery bypass, namely: 1) conventional mechanical ventilation (CMV); 2) late open lung strategy (L-OLS); and 3) early open lung strategy (E-OLS). Methods Sixty-one patients were randomized into 3 groups: 1) CMV (n=21)...