Based on experience in orchestrating collaborative learning scenarios with ubiquitous computing technology, three approaches for extending co-constructive modelling and discussion environments with Personal Digital Assistants (PDAs) connected through a wireless network are described. One application is an annotation tool, the second one replicates a modelling system on the PDA and the third one...

We empirically estimate the substitutability of fixed and mobile services for telecommunications access using a large, U.S. household survey conducted over the period 1999-2001. We take advantage of telephone price subsidy programs for low-income households to identify large, exogenous changes in fixed service prices to find substantial demand substitutability between fixed and mobile subscript...

The difficulty of designing and developing more useable and cost-effective intelligent tutoring systems (ITSs) has caused the realization of some new approaches in that field, the realization of intelligent tutoring shells. Our starting point and perspective on developing ITSs shell is motivated by issues of pragmatics and usability. The advancement of AI methods and techniques makes understand...

The adoption of the personal computer and the Internet is studied within a sample of large U.S. farms. Factors such as age and education influence the adoption of both technologies. Likewise, strong relationships exist between the adoption of each technology and the sophistication of farm management and the complexity of the farm business. After controlling for computer adoption, the results su...

This paper provides cumulative distribution function values for the standard multivariate normal distribution. The values are derived from a simulation model for the multivariate normal distribution, which can be run on any standard personal computer. Utilizing user-input distribution parameters, the model simulates the actual standard multivariate normal distribution. Since approximations of t...

Climate anxiety, reflecting concerns about the negative impacts of climate change, is growing. Planning and action on individual specific risks could be a way to reduce personal anxiety.

1 Brahm Prakash 2 This paper reviews the development of information and communication technology (ICT) in the recent past and focuses on the pattern of its growth in Asian countries 3. It tries to assess ICT's development potential for developing countries of the region where the bulk of the world's poor reside and to capture some of the challenges ICT now faces there. Developments in ICT have ...