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This paper discusses procedures for the analysis of instructional strategies incorporated into distance learning materials, especially with regard to the development of the higher order cognitive ability—critical thinking. It examines the function of task analysis as an integral part of the instructional design process, analysing three different approaches available to the instructional designer towards the analysis of tasks required of distance learners. Comparing the learning hierarchy, the concept hierarchy, and the information processing approaches, it was found that the latter was the only one suitable for this current study because of the requirement that critical thinking be linked with domain‐specific knowledge, rather than be learned as an independent ability. Different algorithms for both the student and the designer/analyst are included as part of the information processing approach, and, although these methods are yet to be validated, they seem to offer sufficient promise, while allowing the analyst to make further decisions during the analysis. 相似文献
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Surabhi Verma Som Sekhar Bhattacharyya Saurav Kumar 《Information processing & management》2018,54(5):791-806
Research on the adoption of systems for big data analytics has drawn enormous attention in Information Systems research. This study extends big data analytics adoption research by examining the effects of system characteristics on the attitude of managers towards the usage of big data analytics systems. A research model has been proposed in this study based on an extensive review of literature pertaining to the Technology Acceptance Model, with further validation by a survey of 150 big data analytics users. Results of this survey confirm that characteristics of the big data analytics system have significant direct and indirect effects on belief in the benefits of big data analytics systems and perceived usefulness, attitude and adoption. Moreover, there are mediation effects that exist among the system characteristics, benefits of big data analytics systems, perceived usefulness and the attitude towards using big data analytics system. This study expands the existing body of knowledge on the adoption of big data analytics systems, and benefits big data analytics providers and vendors while helping in the formulation of their business models. 相似文献
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This paper reports the design, implementation, and evaluation of a teleseminar on instructional design (ID) and computer‐mediated communication (CMC) for the purposes of staff development at The University of Southern Queensland, Toowoomba, Australia. Participation was open to any staff with an involvement or interest in distance education. This study was motivated by the following research questions: Is CMC a viable medium for the professional development of staff in distance education? Does the nature of moderation of CMC‐based discussions influence the nature of contributions from subscribers? Do participants use different strategies (interactive, cognitive, and metacognitive) in CMC‐based discussions? To address these questions a teleseminar was instituted with a focus on the issues of ID and CMC. CMC‐based moderation techniques were used to manage the discussion. Both qualitative and quantitative evaluation tools were used to measure the outcomes of the teleseminar. Results of these evaluation data show that CMC proved to be a viable medium for the professional development of staff, that the moderation strategies influenced the nature of contributions from the subscribers, and that participants used a range of strategies to manage the discussion and their participation in it. 相似文献
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Robert M Bernard Som Naidu 《British journal of educational technology : journal of the Council for Educational Technology》1992,23(1):48-60
This study was designed to assess the instructional potential of two learning strategies—post-questioning and concept mapping—in the presence and absence of systematic instructional feedback. It is a first attempt to test combinations of these treatments experimentally in the context of a course in distance education. Five research questions, drawn from the literature of post-questioning, concept mapping and feedback, were formulated to guide the design and analysis. Substantial differences in achievement outcomes were found for four of the five questions. These results are discussed in relation to the existing literature on outcomes of learning strategies and their implication for practice in distance education. 相似文献
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Vasudha Shukla Manish Vashistha Som Nath Singh 《Indian journal of clinical biochemistry : IJCB》2009,24(1):70-75
Aqueous and alcoholic extracts of amalki (Emblica officinalis), spirulina and wheatgrass were prepared and analyzed for antioxidant
vitamin content (vitamin C and E), total phenolic compounds. Antioxidant status, reducing power and effect on glutathione
S-transferase (GST) activity were evaluated in vitro. Vitamin C content of crude amalaki powder was found to be 5.38 mg/g,
while very less amount 0.22 mg/g was detected in wheat grass. Amalki was rich in vitamin E like activity, total phenolic content,
reducing power and antioxidant activity. Total antioxidant activity of aqueous extract of amalki, spirulina and wheat grass
at 1mg/ml concentration were 7.78, 1.33 and 0.278 mmol/l respectively. At similar concentrations the total antioxidant activity
of alcoholic extract of amalaki, spirulina and wheat grass was 6.67, 1.73 and 0.380 mmol/l respectively. Amalki was also found
to be rich source of phenolic compounds (241mg/g gallic acid equivalent). Alcoholic extract of wheat grass showed 50 % inhibition
in FeCl2- ascorbic acid induced lipid peroxidation of rat liver homogenates in vitro. Both aqueous and alcoholic extracts of amalaki
inhibited activity of rat liver glutathione S-transferase (GST) in vitro in dose dependant manner. Since GST acts as powerful
drug metabolizing enzyme its inhibition by amalaki offers possibility of its use for lowering therapeutic dose of herbal preparations.
The aqueous extracts of both amalki and spirulina also showed protection against t-BOOH induced cytotoxicity and production
of ROS in cultured C6 glial cells. 相似文献
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