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Data Sharing for Learning Analytics – Exploring Risks and Benefits through Questioning
Tore Hoel,Weiqin Chen,Jon Mason 이러닝학회 2016 이러닝학회 논문지 Vol.1 No.1
Moving learning analytics from the research labs to the classrooms, lecture halls, and digital learning spaces requires data sharing. Routine production and consumption of data is no limited to controlled settings as data can be sourced from an increasing diversity of data points and combined or aggregated from these sources within and often beyond the institution. This scaling up of learning analytics raises a host of questions on behalf of the data subjects and therefore informs requirements for design of new solutions and practices. This paper analyses a corpus of more than 250 questions gathered by a European project that organized international workshops and facilitated community exchange. It explores how these questions could inform both the problem space of data sharing and the solution space yet to be fully scoped by research and development within this emerging field. The analysis shows that the discourse on data sharing and big data for education is still at an early stage. Conceptual issues dominate this discourse; however, the elicited questions also hold numerous challenges for technical development and implementation. In concluding we propose a short inventory of what the emerging solution space may entail and suggest a path for further work.
C. G. Granqvist,L. F. Reyes,P. Heszler,V. Lantto,A. Hoel 한국물리학회 2004 Current Applied Physics Vol.4 No.5
Nanocrystalline WO3 lms were prepared by gas evaporation and deposition. Their gas-sensing properties were investigated intwo types of devices. Firstly, the lms were exposed to a set of probing gases while the mean conductance change was recorded atvarious gas concentrations and temperatures. For example, 5 ppm of H2S yielded a conductance increase by. 250 times even atroom temperature, and doping by Al or Au enhanced the sensitivity still further. The maximum sensitivity for H2S, N2O, and COwas found at 400, 525, and 700 K, respectively. For another sensor arrangement, conduction noise was measured in the 0.545 Hzfrequency range for thin Au lms covered with WO3 nanoparticles. The power density of the conductance uctuations was increasedby about two orders of magnitude after alcohol exposure, while the mean resistance changed by less than 0.3%, thus showing thepotential of uctuation-based gas sensing.