Participation in virtual communities of practice (vCoP) can be influenced at the same time by technology acceptance and by community factors. To overcome methodological issues connected with the analysis of these influences, learning analytics were applied. Based on a recent vCoP model, the collaborative dialogue comprising 4040 interventions in 1981 messages created by a vCoP located at a US A...

Combinations of C++ features, like inheritance, templates, and class nesting, allow for the expression of powerful component patterns. In particular, research has demonstrated that, using C++ mixin classes, one can express layered component-based designs concisely with efficient implementations. In this paper, we discuss pragmatic issues related to component-based programming using C++ mixins. ...

While most object-oriented programming is done in classbased languages, the trend in theoretical study has been to develop formal systems that are object-based, without classes and often without explicit inheritance mechanisms. This paper studies the correspondence between object primitives and class constructs of the form found in C++, Eiffel, and Java. The main qualitative insight is that suc...

We have been developing an Intelligent Tutoring System to teach students to analyze and debug C++ programs for semantic and run-time errors. In this tutor, we have used Model-Based Reasoning for domain modeling and explanation generation. In addition, we plan to use it for program animation. In this paper, we will present our design of the tutor, and results from evaluating one instance of the ...

This paper concerns agent based experiments in the field of negotiation and exchange simulation. A computer simulation environment is built, showing the emergence of chaotic price sequences in a simple model of interacting consumers and vendors, both equipped with minimal rules. “Swarm” is the framework of the model (www.santafe.edu/projects/swarm), a simulation tool with a strong object orient...

This paper explores techniques for implementing adaptable software components. Such techniques can greatly facilitate the implementation of software product lines. The techniques we present allow the construction of large transparently adaptable components via composition and parameterization. Functional and structural adaptation, to any level of nesting, is achieved at the point of instantiati...

a Computational Social Science Program, George Mason University, 4400 University Drive, Fairfax, VA 22030, United States b Department of Computer Science and Engineering, Department of Psychology, and Center for the Study of Complex Systems, University of Michigan, 1085 South University Avenue, MI 48109, United States c School of Natural Resources and Environment, University of Michigan, 440 Ch...

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W hen we are asked to describe something, our natural impulse is to reach for an exhaustive definition. If what we are asked to describe is a software concept—and if we are using a programming language— we will usually start writing a record, structure, or class definition, and we won't come back until we have all the properties in place. A bank account is the combination of the account holder'...

To ensure long-term security of energy supply and to mitigate climate change, sustainable low-carbon alternatives to fossil fuels are needed. Second generation biomassto-liquid biofuels provide such an alternative and are widely considered a promising technology that may overcome the environmental and economic problems associated with first generation biofuels. In Austria, a research group at t...