METHOD OF ASSESSMENT OF THE COMMUNICATION CHANNEL BASED ON THE POLYNOMIAL MODEL OF PULSE CHARACTERISTICS

An (electron) microscope can be considered as a communication channel that transfers structural information between an object and an observer. In electron microscopy this information is carried by electrons. According to the theory of Shannon the maximal information rate (or capacity) of a communication channel is given by C = B log2 (1 + S/N) bits/sec., where B is the band width, and S and N the average signal power, respectively noise power at the output. We will now apply to study the information transfer in an electron microscope. For simplicity we will assume the object and the image to be onedimensional (the results can straightforwardly be generalized). An imaging device can be characterized by its transfer function, which describes the magnitude with which a spatial frequency g is transferred through the device, n is the noise. Usually, the resolution of the instrument ᑭ is defined from the cut-off 1/ᑭ beyond which no spadal information is transferred.

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Method for measuring distortions of a speech signal during its transmission over a communication channel to a biometric identification system

Izmeritel`naya Tekhnika ◽

10.32446/0368-1025it.2020-11-65-72 ◽

2020 ◽

pp. 65-72

Author(s):

V. V. Savchenko ◽

A. V. Savchenko

Keyword(s):

Speech Signal ◽

Communication Channel ◽

Speaker Identification ◽

A Priori ◽

Small Samples ◽

Practical Implementation ◽

Identification System ◽

New Information ◽

Discrimination Criterion ◽

A Priori Uncertainty

This paper is devoted to the presence of distortions in a speech signal transmitted over a communication channel to a biometric system during voice-based remote identification. We propose to preliminary correct the frequency spectrum of the received signal based on the pre-distortion principle. Taking into account a priori uncertainty, a new information indicator of speech signal distortions and a method for measuring it in conditions of small samples of observations are proposed. An example of fast practical implementation of the method based on a parametric spectral analysis algorithm is considered. Experimental results of our approach are provided for three different versions of communication channel. It is shown that the usage of the proposed method makes it possible to transform the initially distorted speech signal into compliance on the registered voice template by using acceptable information discrimination criterion. It is demonstrated that our approach may be used in existing biometric systems and technologies of speaker identification.

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PORTFOLIOS ASSESSMENT AS A METHOD OF ASSESSMENT OF LANGUAGE IN ESL CLASSROOM CONTEXT

Jurnal Dinamika Pendidikan ◽

10.33541/jdp.v8i2.115 ◽

2015 ◽

Vol 8 (2) ◽

pp. 61

Author(s):

Juella Rumiris

Keyword(s):

Assessment Tool ◽

Theoretical Perspective ◽

Curriculum Planning ◽

Classroom Context ◽

Learning Program ◽

English As Second Language ◽

English As Foreign Language ◽

Learning Improvement ◽

Method Of Assessment ◽

Teacher's Perspective

The use of portfolios as an assessment tool probably is unlikely common in Asian countries. Portfolios is commonly considered as a compilation of students’ work for a certain period of time. In fact, the portfolios may show the originality of and the nature of students’ learning improvement. In this paper, the writer will discuss portfolios as a method of assessment in English as Second Language or English as Foreign Language (ESL/EFL) classroom context from teacher’s perspective. This paper is designed with this format order: firstly to explain about the degree of portfolios method to assess content, skills and knowledge in the teach-ing-learning program in the ESL/EFL context, to correlate portfolios system to model of curriculum planning and policy context. Secondly, to discuss the strengths and weaknesses of portfolios method from a theoretical perspective, and analyse the validity, reliability, and fairness. Thirdly, to specify the association of portfolios method and the types of assessment and the correlation of portfolios method with assessment for learning. Fourthly, to evaluate the degree of portfolios method of assessment promoting learning of the knowledge, skills, and abilities related to my teaching experience.Keywords : Portfolios, Assessment, Curriculum, Learning, Knowledge, Skills.

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