著者
Stephen J.H. Yang Owen H.T. Lu Anna Y.Q. Huang Jeff C.H. Huang Hiroaki Ogata Albert J.Q. Lin
出版者
Information Processing Society of Japan
雑誌
Journal of Information Processing (ISSN:18826652)
巻号頁・発行日
vol.26, pp.170-176, 2018 (Released:2018-02-15)
参考文献数
29
被引用文献数
33

With the rise of big data analytics, learning analytics has become a major trend for improving the quality of education. Learning analytics is a methodology for helping students to succeed in the classroom; the principle is to predict student's academic performance at an early stage and thus provide them with timely assistance. Accordingly, this study used multiple linear regression (MLR), a popular method of predicting students' academic performance, to establish a prediction model. Moreover, we combined MLR with principal component analysis (PCA) to improve the predictive accuracy of the model. Traditional MLR has certain drawbacks; specifically, the coefficient of determination (R2) and mean square error (MSE) measures and the quantile-quantile plot (Q-Q plot) technique cannot evaluate the predictive performance and accuracy of MLR. Therefore, we propose predictive MSE (pMSE) and predictive mean absolute percentage correction (pMAPC) measures for determining the predictive performance and accuracy of the regression model, respectively. Analysis results revealed that the proposed model for predicting students' academic performance could obtain optimal pMSE and pMAPC values by using six components obtained from PCA.
著者
E.J.H.Corner 渡辺清彦著
出版者
廣川書店
巻号頁・発行日
1969
著者
Pawan K. Tiwari G. J. H. Brussaard M. J. v. d. Wiel V. K. Tripathi
出版者
THE PHYSICAL SOCIETY OF JAPAN
雑誌
Journal of the Physical Society of Japan (ISSN:00319015)
巻号頁・発行日
vol.74, no.8, pp.2255-2259, 2005-08-15 (Released:2008-01-24)
参考文献数
23
被引用文献数
1

An indigenously built Ti:sapphire laser system delivering 50 mJ, 100 fs pulses at a repetition rate of 10 Hz, is employed to tunnel ionize air at 1 atm pressure and form a plasma channel. The laser is line focused using a cylindrical lens to a spot size of 20μm×1mm. A folded wave interferometry is used to deduce the radial electron density profile by measuring the phase shift and employing Abel inversion. The maximum value of chord-integrated electron density and radial electron density are estimated to be approximately equal to 3.0×1016 cm−2 and 4.0×1018 cm−3 respectively with density scale length of 20 μm. These results have been theoretically interpreted by developing a unified formalism of tunnel ionization. The experimental results are in reasonable agreement with the theory.
著者
KOEMAN J. H.
雑誌
Nature
巻号頁・発行日
vol.245, pp.385-386, 1973
被引用文献数
7 319