We investigate whether erroneous examples in the domain of fractions can help students learn from common errors of other students presented in a computer-based system. Presenting the errors of others could spare students the embarrassment and demotivation of confronting their own errors. We conducted lab and school studies with students of different grade levels to measure the effects of learni...

We evaluated the effect of providing error-flagging as support for error detection, but not error correction while the student is solving a problem. We found that providing error-flagging in addition to demand feedback during practice learning was no more effective than providing only demand feedback when the tutor did not explicitly mention that errors were being flagged. On the other hand, ex...

The CoNLL-2014 shared task was devoted to grammatical error correction of all error types. In this paper, we give the task definition, present the data sets, and describe the evaluation metric and scorer used in the shared task. We also give an overview of the various approaches adopted by the participating teams, and present the evaluation results. Compared to the CoNLL2013 shared task, we hav...

In this paper, we construct two classes of t × n, s-disjunct matrix with subspaces in orthogonal space F(2ν+1) q of characteristic 2 and exhibit their disjunct properties. We also prove that the test efficiency t/n of constructions II is smaller than that of D’yachkov et al. (J. Comput. Biol. 12:1129–1136, 2005).

In this paper we develop an integrated model for request mechanism and data transmission in multi-channel wireless local area networks. We calculated the performance parameters for single and multi-channel wireless networks when the channel is noisy. The proposed model is general it can be applied to different wireless networks such as IEEE802.11x, IEEE802.16, CDMA operated networks and Hiperla...

Exclusive and inclusive (ν µ , µ −), (ν e , e −) cross-sections and µ −-capture rates are calculated for 12 C and 16 O using the consistent random phase approximation (RPA) and pairing model. After a pairing correction is introduced to the RPA results the flux-averaged theoretical (ν µ , µ −), (ν e , e −) cross-sections and µ −-capture rates in 12 C are in good agreement with experiment. In par...

In this paper, a construction of optimal constant composition codes is developed, and used to derive some series of new optimal constant composition codes meeting the upper bound given by [13].