• Journal of the Korean Data and Information Science Society
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• v.20 no.1
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• pp.65-75
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• 2009

Most of universities have carried out course evaluation to improve students's satisfaction for the established lecture and apply the performance appraisal for professor. But, course evaluation depends on many variables such as class size, type of lecture, evaluator's grade and so on. As the results, such variables lead to serious bias which makes lecturers distrust the course evaluation results. In this paper, we compare some equating methods for the course evaluation and the efficiencies for some equating methods. And we will recommend one of them which has best efficiency. Also we give the example to which the method is applied.

• Journal of the Korean Data and Information Science Society
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• v.21 no.3
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• pp.513-521
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• 2010

Most of universities have carried out course evaluation to apply the performance appraisal for professor. But, course evaluation depends on characteristics of each class such as class size, type of lecture, evaluator's grade and so on. As the results, such characteristics of each class lead to serious bias which makes lecturers distrust the course evaluation results. Hence, we propose a equating method for the course evaluation by regression analysis which use stepwise variable selection. And we compare proposed method with the other method by Cho et al. (2009) with respect to efficiencies. Also we give the example to which the method is applied.

• Journal of the Korean Institute of Telematics and Electronics
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• v.22 no.6
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• pp.41-45
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• 1985

A suboptimum block quantization method is investigated for efficent transform coding. In our study the following method has appeared as suboptimum. At first, optimum bit allocation is done assuming the varances of the transform coefficients are known. Secndly, a varance estimation algorithm which results from the approximate equations governing the optimum vit alllocation is applied. The better performance of the proposed block quantization method has been confirmed by simulations based on varous pdf assumptions. the results indicate that the proposed method yields overall improvements of about 25% in NMSE for both the symmetric nonuniform and uniform quantizer at the coding rate of 1 bit/pel.