4,918 research outputs found
Knowledgezoom for java: A concept-based exam study tool with a zoomable open student model
This paper presents our attempt to develop a personalized exam preparation tool for Java/OOP classes based on a fine-grained concept model of Java knowledge. Our goal was to explore two most popular student model-based approaches: open student modeling and problem sequencing. The result of our work is a Java exam preparation tool, Knowledge Zoom. The tool combines an open concept-level student model component, Knowledge Explorer and a concept-based sequencing component, Knowledge Maximizer into a single interface. This paper presents both components of Knowledge Zoom, reports results of its evaluation, and discusses lessons learned. © 2013 IEEE
New bounds on the signed total domination number of graphs
In this paper, we study the signed total domination number in graphs and
present new sharp lower and upper bounds for this parameter. For example by
making use of the classic theorem of Turan, we present a sharp lower bound on
this parameter for graphs with no complete graph of order r+1 as a subgraph.
Also, we prove that n-2(s-s') is an upper bound on the signed total domination
number of any tree of order n with s support vertices and s' support vertives
of degree two. Moreover, we characterize all trees attainig this bound.Comment: This paper contains 11 pages and one figur
Neural networks in geophysical applications
Neural networks are increasingly popular in geophysics.
Because they are universal approximators, these
tools can approximate any continuous function with an
arbitrary precision. Hence, they may yield important
contributions to finding solutions to a variety of geophysical applications.
However, knowledge of many methods and techniques
recently developed to increase the performance
and to facilitate the use of neural networks does not seem
to be widespread in the geophysical community. Therefore,
the power of these tools has not yet been explored to
their full extent. In this paper, techniques are described
for faster training, better overall performance, i.e., generalization,and the automatic estimation of network size
and architecture
A Proposed Bus Arbitration Scheme for Multimedia Workstations
The integration of video and audio into computers requires the support of continuous streams at the hardware level. This paper proposes a bus bandwidth management and access arbitration scheme for a multimedia workstation. It is assumed that a multimedia workstation consists of several specialized processing modules which are linked by a packet-switched bus. Using the proposed scheme, the bus can support a mix of real-time continuous media streams and random transactions while fulfilling special requirements corresponding to each traffic type. Specifically, the bus provides very fast response to random transactions and serves continuous media streams in such a way that no piece of data falls behind its deadline. Furthermore, the performance with respect to continuous media traffic is maintained independent of time variations of randomm traffic. Practical implementation guidelines are provided. Finally, the performance of the proposed scheme is compared with other possible approaches
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