In 2005 an integrated blended e-learning service based on Moodle Learning Management System (LMS), was introduced in Silesian University of Technology, Gliwice, Poland [1]. Review of LMS content shows that some courses contain insufficient number of components, and in many cases the quality of resources is poor. The goal of our research was to identify why some teachers are reluctant to utilize LMS. A survey was carried out in order to examine to what extent teachers accept and make use of various LMS elements. Teachers were also asked to indicate main barriers to LMS-based teaching and present their comments on perspectives of blended learning. Several figures, charts and comments resulting from the survey are presented in the paper. The main obstacles were identified and the suggestions how to eliminate them are presented in the paper.

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Abstract-The linear-phase IIR filters are described in many cases, mainly due to distortion-free transmission of signals. One of the major problems of IIR filter design is stability, which can be obtained with suitable value of group delay τ . This paper concerns calculation of filter order N and group delay τ in case of quasi-equiripple design of IIR filters. We propose a novel procedure for determining N and τ values; the procedure is valid for all types of filters with arbitrary number of zeros and a few non-zero poles. Evaluation of the proposed approach as well as examples illustrating its application are provided in the paper.

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