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