Browsing by Author "Lai, Chih-Hung"

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A Review of Intervention Studies On Technology-assisted Instruction From 2005-2010
(2013-07-01)
Wu, Ying-Tien
;
Hou, Huei-Tse
;
Hwang, Fu-Kwun
;
Lee, Min-Hsien
;
Lai, Chih-Hung
By reviewing papers published in five important SSCI journals from 2005 to 2010, this study aimed to provide insights into intervention studies on technology-assisted instruction. It was found that still relatively little research on educational technology which addresses the effects of specific instructional interventions on student learning was conducted during this period. Moreover, most reviewed studies were conducted in higher education, rather than in high school, elementary school, or adult education contexts. The two subject domains, science and engineering (including computer studies), were most frequently involved in these studies, the majority of which addressed achievement as research (learning outcome) foci, while relatively fewer studies investigated students' learning process or affective outcomes. Regarding technology adoption, this study revealed that, in both the 2005-2007 and 2008-2010 periods, technologies for specific instructional purposes(e.g., a specially designed system for online collaborative writing) were more frequently adopted than those for general purposes (such as PowerPoint). This study also reveals that technology-mediated interpersonal interactions are commonly utilized in these intervention studies, with the focus mainly on student-student interactions.
Epitaxial Magnetic Oxide Nanocrystals Via Phase Decomposition of Bismuth Perovskite Precursors
(2012-12-19)
Bogle, Kashinath A.
;
Cheung, Jeffrey
;
Chen, Yong-Lun
;
Liao, Sheng-Chieh
;
Lai, Chih-Hung
The phase instability of bismuth perovskite (BiMO3), where M is a ferromagnetic cation, is exploited to create self-assembled magnetic oxide nanocrystal arrays on oxide supports. Conditions during pulsed laser deposition are tuned so as to induce complete breakdown of the perovskite precursor into bismuth oxide (Bi2O3) and metal oxide (M-Ox) pockets. Subsequent cooling in vacuum volatizes the Bi2O3 leaving behind an array of monodisperse nanocrystals. In situ reflective high energy electron diffraction beam is exploited to monitor the synthesis in real-time. Analysis of the patterns confirms the phase separation and volatization process. Successful synthesis of M-Ox, where M = Mn, Fe, Co, and Cr, is shown using this template-free facile approach. Detailed magnetic characterization of nanocrystals is carried out to reveal the functionalities such as magnetic anisotropy as well as larger than bulk moments, as expected in these oxide nanostructures.