Journal & Issues

Volume 31 (2023): Issue 52 (June 2023)

Volume 30 (2022): Issue 51 (November 2022)

Volume 30 (2022): Issue 50 (June 2022)

Volume 29 (2021): Issue 49 (September 2021)

Volume 29 (2021): Issue 48 (June 2021)

Volume 28 (2020): Issue 47 (September 2020)

Volume 28 (2020): Issue 46 (June 2020)

Volume 27 (2019): Issue 45 (September 2019)

Volume 27 (2019): Issue 44 (June 2019)

Volume 27 (2019): Issue s1 (December 2019)
Special Number

Volume 26 (2018): Issue 43 (September 2018)

Volume 26 (2018): Issue 42 (June 2018)

Volume 25 (2017): Issue 41 (September 2017)

Volume 25 (2017): Issue 40 (June 2017)

Volume 24 (2016): Issue 39 (December 2016)

Volume 24 (2016): Issue 38 (September 2016)

Volume 24 (2016): Issue 37 (June 2016)

Volume 23 (2015): Issue 36 (June 2015)

Volume 23 (2015): Issue s1 (August 2015)
Issue Title: Special number

Volume 22 (2014): Issue 341 (December 2014)
Special Issue

Volume 22 (2014): Issue 35 (December 2014)

Volume 22 (2014): Issue 34 (June 2014)

Volume 21 (2013): Issue Special-Issue (June 2013)

Volume 21 (2013): Issue 33 (December 2013)

Volume 20 (2012): Issue Special-Number (December 2012)
CO-MAT-TECH 2012

Volume 20 (2013): Issue 32 (January 2013)

Volume 19 (2011): Issue 31 (January 2011)

Volume 19 (2011): Issue 30 (January 2011)

Volume 18 (2010): Issue 29 (January 2010)

Volume 18 (2010): Issue 28 (January 2010)

Journal Details
Format
Journal
eISSN
1338-0532
ISSN
1336-1589
First Published
03 Mar 2011
Publication timeframe
2 times per year
Languages
English

Search

Volume 19 (2011): Issue 30 (January 2011)

Journal Details
Format
Journal
eISSN
1338-0532
ISSN
1336-1589
First Published
03 Mar 2011
Publication timeframe
2 times per year
Languages
English

Search

0 Articles
Open Access

Monitoring the Influence of Chemical Composition of Electrical and Dielectric Properties of Special Glasses

Published Online: 21 Sep 2011
Page range: 9 - 15

Abstract

Monitoring the Influence of Chemical Composition of Electrical and Dielectric Properties of Special Glasses

The paper deals with the results of experimentally determined influence of the chemical composition change of pure Ge-Se-Te glasses systems with the rare earths elements additions (Pr, Er and Ho in oxide or pure metal form) on electrical and dielectric properties of the glasses. We used chalcogenide bulk glasses Ge20Se80-xTex for x ∈ (0, 5, 10, 15) prepared by systematic replacement of Se by Te. We wanted to find how electrical and dielectric properties of chosen chalcogenide glasses change with the change of content and form of rare earths. We carried out the measurements at different temperatures from 20 °C to 170 °C. Results show that the inhomogeneity and defects in the measured glasses have had an impact on the measured dielectric parameters.

Keywords

  • special glasses
  • chalcogenide glasses
  • conductivity
  • rare earth elements
  • permittivity
  • electric module
Open Access

Number of Points for Roundness Measurement - Measured Results Comparison

Published Online: 21 Sep 2011
Page range: 19 - 24

Abstract

Number of Points for Roundness Measurement - Measured Results Comparison

Paper deals with filtering roundness. It presents experimental results measured for roundness turning and cylindrical grinding. Roundness was measured using Prismo Navigator 5 coordinate measuring machine. Evaluation was done by four methods: Minimum zone reference circles (MZCI), Least squares reference circle (LSCI), Minimum circumscribed reference circle (MCCI) and Maximum inscribed reference circle (MICI). The filters used were: Gauss, Spline and no filter.

Keywords

  • roundness
  • reference circle
  • filter
  • measurement
  • evaluation methods
Open Access

Metrological Control of Selected Surface Types of a Mechanical Part by Using On-Machine Measurement System

Published Online: 21 Sep 2011
Page range: 25 - 35

Abstract

Metrological Control of Selected Surface Types of a Mechanical Part by Using On-Machine Measurement System

The paper is focused on the research of On-machine measurement systems for a CNC multi-axis milling machine. Research is aimed at the suitable selection of measuring parameters for On-machine measurement systems in order to reach an accurate and reliable quality control of the mechanical part. Theoretical information and overall concept of research are also presented.

Keywords

  • on-machine measurement systems
  • coordinate measuring machine
  • accuracy
  • touch probe
Open Access

Application of Six Sigma Method to EMS Design

Published Online: 21 Sep 2011
Page range: 39 - 44

Abstract

Application of Six Sigma Method to EMS Design

The Six Sigma method is a complex and flexible system of achieving, maintaining and maximizing the business success. Six Sigma is based mainly on understanding the customer needs and expectation, disciplined use of facts and statistics analysis, and responsible approach to managing, improving and establishing new business, manufacturing and service processes.

Keywords

  • management
  • LCA
  • SixSigma
  • quality
  • environment
Open Access

Determining the Total Dispersion Zone for Micrometer SM Measuring Equipment

Published Online: 21 Sep 2011
Page range: 45 - 50

Abstract

Determining the Total Dispersion Zone for Micrometer S<sub>M</sub> Measuring Equipment

The aim of the total dispersion zone for measuring equipment SM is to define if three workers A, B, C can achieve the same values of measurement using the same measuring equipment. Before estimating the total dispersion zone for measuring equipment SM. the calibration of the micrometer was carried out. The values were obtained by measuring the width of clip anchor. It is necessary to calculate the average values XA, XB, X C and to calculate standard deviations SΔA, SΔB, SΔC for three workers. Finally, the total dispersion zone SM will be calculated and the results will be interpreted.

Keywords

  • measuring equipment
  • average value
  • standard deviation
  • dispersion zone
Open Access

The Process Capability Study of Pressing Process for Force Closed

Published Online: 21 Sep 2011
Page range: 51 - 57

Abstract

The Process Capability Study of Pressing Process for Force Closed

Objective of the statistical assessment process is to determine whether all major manageable causes of instability of the process have been removed. The basis for statistical regulation is management of production processes. If a process operates a large number of random effects, the resulting distribution has the character of a normal distribution. Processes are considered as eligible if the indexes Cp and Cpk are greater than 1.33.

Keywords

  • process
  • stability
  • normality
  • capability
Open Access

Self-Study and Cooperation of Pupils in Project Based Instruction

Published Online: 21 Sep 2011
Page range: 61 - 66

Abstract

Self-Study and Cooperation of Pupils in Project Based Instruction

This paper is focused on the use of cooperative and individualized concepts of instruction in project based learning. Part of the paper includes partial results of the questionnaire survey carried out within the grant project KEGA No. 031-035 SUT — 4 "Project models of teaching at the secondary vocational schools".

Keywords

  • individualized instruction
  • self-study
  • cooperative instruction
  • cooperation
  • project based learning
Open Access

Quality and Dynamic Characteristics of Control System Visualization in Control Web

Published Online: 21 Sep 2011
Page range: 67 - 72

Abstract

Quality and Dynamic Characteristics of Control System Visualization in Control Web

Progress of information technologies and their applications create the necessary need to explore the analysis of techniques to estimate the impact of architecture control system on dynamic characteristics of control. Major impact factors on dynamics and quality of visualization, control modes selection and impact analysis are described in the article.

Keywords

  • Visualization
  • Control Web
  • Modicon
  • control
  • real-time
Open Access

Acoustical Specification of New Equipment with Respect to Noise Policy

Published Online: 21 Sep 2011
Page range: 73 - 82

Abstract

Acoustical Specification of New Equipment with Respect to Noise Policy

Increasingly, the Slovakian and European occupational health and safety legislation requires designers, manufacturers and suppliers of industrial plants and equipment to minimise hazards, such as excessive noise associated with their products, and to provide information about potential hazards. Even so, noise is still often overlooked with the result that the working environment is needlessly noisy. The purpose of this paper is to:

- provide guidelines for the preparation of noise specifications;

- show how to calculate the maximum acceptable noise level for new equipment;

- show how to interpret noise information provided by suppliers.

Keywords

  • noise policy
  • noise manager
  • acceptable noise level
  • noise information
Open Access

Size and Return Periods of Extreme Disasters

Published Online: 21 Sep 2011
Page range: 83 - 91

Abstract

Size and Return Periods of Extreme Disasters

Extreme disasters occur rarely and altogether occasionally, and therefore, the determination of maximum possible size or maximum expected size of natural and other disasters is important for the safety management and for the insurance domain, and considerable attention is paid to it. Systematic methodology development has been supported by professional papers since 70s of the last century or so. At present, the extreme value methods based on the great numbers of law, fuzzy sets etc. are used. The example shows the high differences in the extreme values existing in the application of old concepts and new methods. By use of the extreme value methods, it is also possible to calculate the return period of extreme disasters. The example showing return periods for different disaster sizes is given.

Keywords

  • disasters
  • hazard
  • extreme impacts
  • extreme disaster size
Open Access

Students Relationships and Teacher's Authority as Axiological, Ethical, Pedagogical, Social and Psychological Problems

Published Online: 21 Sep 2011
Page range: 93 - 98

Abstract

Students Relationships and Teacher's Authority as Axiological, Ethical, Pedagogical, Social and Psychological Problems

The paper is focused on the research into the problems of education regarding the relations between students (bullying, competiveness and cooperation) and the decreasing teacher's authority in schools and society. We found that relations between pupils and students of elementary and secondary schools show several negative tendencies including harming each other, reduced rate of mutual sensitivity and preference of rivality to cooperation. Authority of teachers is permanently decreasing not only with pupils and students, but with parents and society, too. Society, parents and students much less value study results and wisdom, and these issues consequently influence the decreasing teacher's status. On the other hand, this behavior leads to decreasing the interest in semantic learning. The roots of these problems can be found in the postmodern crisis of Western culture, associated with severe deficiencies of the political system and market economy as well as one-sided rational orientation of Western society at the expense of the spiritual needs of man.

Keywords

  • education
  • society
  • authority
  • problems
  • teacher
  • students
  • postmodern
Open Access

Event Processing and Variable Part of Sample Period Determining in Combined Systems Using GA

Published Online: 21 Sep 2011
Page range: 99 - 104

Abstract

Event Processing and Variable Part of Sample Period Determining in Combined Systems Using GA

This article deals with combined dynamic systems and usage of modern techniques in dealing with these systems, focusing particularly on sampling period design, cyclic processing tasks and related processing algorithms in the combined event management systems using genetic algorithms.

Keywords

  • events
  • sample period
  • genetic algorithms
  • combined dynamic systems
Open Access

Five Years of Research Into Technology-Enhanced Learning at the Faculty of Materials Science and Technology

Published Online: 21 Sep 2011
Page range: 105 - 114

Abstract

Five Years of Research Into Technology-Enhanced Learning at the Faculty of Materials Science and Technology

The article describes a five-year period of Technology Enhanced Learning (TEL) implementation at the Faculty of Materials Science and Technology (MTF) in Trnava. It is a part of the challenges put forward by the 7th Framework Programme (ICT research in FP7) focused on "how information and communication technologies can be used to support learning and teaching". The empirical research during the years 2006-2008 was focused on technology-driven support of teaching, i. e. the development of VLE (Virtual Learning Environment) and the development of database applications such as instruments developed simultaneously with the information support of the project, and tested and applied directly in the teaching of bachelor students.

During this period, the MTF also participated in the administration of the FP7 KEPLER project proposal in the international consortium of 20 participants. In the following period of 2009-2010, the concept of educational activities automation systematically began to develop. Within this concept, the idea originated to develop a universal multi-purpose system BIKE based on the batch processing knowledge paradigm. This allowed to focus more on educational approach, i.e. TEL educational-driven and to finish the programming of the Internet application - network for feedback (communication between teachers and students). Thanks to this specialization, the results of applications in the teaching at MTF could gradually be presented at the international conferences focused on computer-enhanced engineering education. TEL was implemented at a detached workplace and four institutes involving more than 600 students-bachelors and teachers of technical subjects. Four study programmes were supported, including technical English language. Altogether, the results have been presented via 16 articles in five countries, including the EU level (IGIP-SEFI).

Keywords

  • Technology Enhanced Learning
  • Computer Assisted Learning
  • Batch Knowledge Processing
Open Access

Influence of Retardants to Burning Lignocellulosic Materials

Published Online: 21 Sep 2011
Page range: 115 - 123

Abstract

Influence of Retardants to Burning Lignocellulosic Materials

The paper deals with monitoring retardant changes of lignocellulosic materials. Combustion of lignocellulosic materials and fire-technical characteristics are described. In assessing the retarding effect of salt NH4H2PO4, fire-technical characteristics as limiting oxygen index (LOI) were measured, and by using thermoanalytical TG and DSC methods. High-temperature process of cellulose degradation at various flame concentrations was studied.

Keywords

  • burning
  • fire-technical characteristics
  • limiting oxygen index
  • thermal analysis
0 Articles
Open Access

Monitoring the Influence of Chemical Composition of Electrical and Dielectric Properties of Special Glasses

Published Online: 21 Sep 2011
Page range: 9 - 15

Abstract

Monitoring the Influence of Chemical Composition of Electrical and Dielectric Properties of Special Glasses

The paper deals with the results of experimentally determined influence of the chemical composition change of pure Ge-Se-Te glasses systems with the rare earths elements additions (Pr, Er and Ho in oxide or pure metal form) on electrical and dielectric properties of the glasses. We used chalcogenide bulk glasses Ge20Se80-xTex for x ∈ (0, 5, 10, 15) prepared by systematic replacement of Se by Te. We wanted to find how electrical and dielectric properties of chosen chalcogenide glasses change with the change of content and form of rare earths. We carried out the measurements at different temperatures from 20 °C to 170 °C. Results show that the inhomogeneity and defects in the measured glasses have had an impact on the measured dielectric parameters.

Keywords

  • special glasses
  • chalcogenide glasses
  • conductivity
  • rare earth elements
  • permittivity
  • electric module
Open Access

Number of Points for Roundness Measurement - Measured Results Comparison

Published Online: 21 Sep 2011
Page range: 19 - 24

Abstract

Number of Points for Roundness Measurement - Measured Results Comparison

Paper deals with filtering roundness. It presents experimental results measured for roundness turning and cylindrical grinding. Roundness was measured using Prismo Navigator 5 coordinate measuring machine. Evaluation was done by four methods: Minimum zone reference circles (MZCI), Least squares reference circle (LSCI), Minimum circumscribed reference circle (MCCI) and Maximum inscribed reference circle (MICI). The filters used were: Gauss, Spline and no filter.

Keywords

  • roundness
  • reference circle
  • filter
  • measurement
  • evaluation methods
Open Access

Metrological Control of Selected Surface Types of a Mechanical Part by Using On-Machine Measurement System

Published Online: 21 Sep 2011
Page range: 25 - 35

Abstract

Metrological Control of Selected Surface Types of a Mechanical Part by Using On-Machine Measurement System

The paper is focused on the research of On-machine measurement systems for a CNC multi-axis milling machine. Research is aimed at the suitable selection of measuring parameters for On-machine measurement systems in order to reach an accurate and reliable quality control of the mechanical part. Theoretical information and overall concept of research are also presented.

Keywords

  • on-machine measurement systems
  • coordinate measuring machine
  • accuracy
  • touch probe
Open Access

Application of Six Sigma Method to EMS Design

Published Online: 21 Sep 2011
Page range: 39 - 44

Abstract

Application of Six Sigma Method to EMS Design

The Six Sigma method is a complex and flexible system of achieving, maintaining and maximizing the business success. Six Sigma is based mainly on understanding the customer needs and expectation, disciplined use of facts and statistics analysis, and responsible approach to managing, improving and establishing new business, manufacturing and service processes.

Keywords

  • management
  • LCA
  • SixSigma
  • quality
  • environment
Open Access

Determining the Total Dispersion Zone for Micrometer SM Measuring Equipment

Published Online: 21 Sep 2011
Page range: 45 - 50

Abstract

Determining the Total Dispersion Zone for Micrometer S<sub>M</sub> Measuring Equipment

The aim of the total dispersion zone for measuring equipment SM is to define if three workers A, B, C can achieve the same values of measurement using the same measuring equipment. Before estimating the total dispersion zone for measuring equipment SM. the calibration of the micrometer was carried out. The values were obtained by measuring the width of clip anchor. It is necessary to calculate the average values XA, XB, X C and to calculate standard deviations SΔA, SΔB, SΔC for three workers. Finally, the total dispersion zone SM will be calculated and the results will be interpreted.

Keywords

  • measuring equipment
  • average value
  • standard deviation
  • dispersion zone
Open Access

The Process Capability Study of Pressing Process for Force Closed

Published Online: 21 Sep 2011
Page range: 51 - 57

Abstract

The Process Capability Study of Pressing Process for Force Closed

Objective of the statistical assessment process is to determine whether all major manageable causes of instability of the process have been removed. The basis for statistical regulation is management of production processes. If a process operates a large number of random effects, the resulting distribution has the character of a normal distribution. Processes are considered as eligible if the indexes Cp and Cpk are greater than 1.33.

Keywords

  • process
  • stability
  • normality
  • capability
Open Access

Self-Study and Cooperation of Pupils in Project Based Instruction

Published Online: 21 Sep 2011
Page range: 61 - 66

Abstract

Self-Study and Cooperation of Pupils in Project Based Instruction

This paper is focused on the use of cooperative and individualized concepts of instruction in project based learning. Part of the paper includes partial results of the questionnaire survey carried out within the grant project KEGA No. 031-035 SUT — 4 "Project models of teaching at the secondary vocational schools".

Keywords

  • individualized instruction
  • self-study
  • cooperative instruction
  • cooperation
  • project based learning
Open Access

Quality and Dynamic Characteristics of Control System Visualization in Control Web

Published Online: 21 Sep 2011
Page range: 67 - 72

Abstract

Quality and Dynamic Characteristics of Control System Visualization in Control Web

Progress of information technologies and their applications create the necessary need to explore the analysis of techniques to estimate the impact of architecture control system on dynamic characteristics of control. Major impact factors on dynamics and quality of visualization, control modes selection and impact analysis are described in the article.

Keywords

  • Visualization
  • Control Web
  • Modicon
  • control
  • real-time
Open Access

Acoustical Specification of New Equipment with Respect to Noise Policy

Published Online: 21 Sep 2011
Page range: 73 - 82

Abstract

Acoustical Specification of New Equipment with Respect to Noise Policy

Increasingly, the Slovakian and European occupational health and safety legislation requires designers, manufacturers and suppliers of industrial plants and equipment to minimise hazards, such as excessive noise associated with their products, and to provide information about potential hazards. Even so, noise is still often overlooked with the result that the working environment is needlessly noisy. The purpose of this paper is to:

- provide guidelines for the preparation of noise specifications;

- show how to calculate the maximum acceptable noise level for new equipment;

- show how to interpret noise information provided by suppliers.

Keywords

  • noise policy
  • noise manager
  • acceptable noise level
  • noise information
Open Access

Size and Return Periods of Extreme Disasters

Published Online: 21 Sep 2011
Page range: 83 - 91

Abstract

Size and Return Periods of Extreme Disasters

Extreme disasters occur rarely and altogether occasionally, and therefore, the determination of maximum possible size or maximum expected size of natural and other disasters is important for the safety management and for the insurance domain, and considerable attention is paid to it. Systematic methodology development has been supported by professional papers since 70s of the last century or so. At present, the extreme value methods based on the great numbers of law, fuzzy sets etc. are used. The example shows the high differences in the extreme values existing in the application of old concepts and new methods. By use of the extreme value methods, it is also possible to calculate the return period of extreme disasters. The example showing return periods for different disaster sizes is given.

Keywords

  • disasters
  • hazard
  • extreme impacts
  • extreme disaster size
Open Access

Students Relationships and Teacher's Authority as Axiological, Ethical, Pedagogical, Social and Psychological Problems

Published Online: 21 Sep 2011
Page range: 93 - 98

Abstract

Students Relationships and Teacher's Authority as Axiological, Ethical, Pedagogical, Social and Psychological Problems

The paper is focused on the research into the problems of education regarding the relations between students (bullying, competiveness and cooperation) and the decreasing teacher's authority in schools and society. We found that relations between pupils and students of elementary and secondary schools show several negative tendencies including harming each other, reduced rate of mutual sensitivity and preference of rivality to cooperation. Authority of teachers is permanently decreasing not only with pupils and students, but with parents and society, too. Society, parents and students much less value study results and wisdom, and these issues consequently influence the decreasing teacher's status. On the other hand, this behavior leads to decreasing the interest in semantic learning. The roots of these problems can be found in the postmodern crisis of Western culture, associated with severe deficiencies of the political system and market economy as well as one-sided rational orientation of Western society at the expense of the spiritual needs of man.

Keywords

  • education
  • society
  • authority
  • problems
  • teacher
  • students
  • postmodern
Open Access

Event Processing and Variable Part of Sample Period Determining in Combined Systems Using GA

Published Online: 21 Sep 2011
Page range: 99 - 104

Abstract

Event Processing and Variable Part of Sample Period Determining in Combined Systems Using GA

This article deals with combined dynamic systems and usage of modern techniques in dealing with these systems, focusing particularly on sampling period design, cyclic processing tasks and related processing algorithms in the combined event management systems using genetic algorithms.

Keywords

  • events
  • sample period
  • genetic algorithms
  • combined dynamic systems
Open Access

Five Years of Research Into Technology-Enhanced Learning at the Faculty of Materials Science and Technology

Published Online: 21 Sep 2011
Page range: 105 - 114

Abstract

Five Years of Research Into Technology-Enhanced Learning at the Faculty of Materials Science and Technology

The article describes a five-year period of Technology Enhanced Learning (TEL) implementation at the Faculty of Materials Science and Technology (MTF) in Trnava. It is a part of the challenges put forward by the 7th Framework Programme (ICT research in FP7) focused on "how information and communication technologies can be used to support learning and teaching". The empirical research during the years 2006-2008 was focused on technology-driven support of teaching, i. e. the development of VLE (Virtual Learning Environment) and the development of database applications such as instruments developed simultaneously with the information support of the project, and tested and applied directly in the teaching of bachelor students.

During this period, the MTF also participated in the administration of the FP7 KEPLER project proposal in the international consortium of 20 participants. In the following period of 2009-2010, the concept of educational activities automation systematically began to develop. Within this concept, the idea originated to develop a universal multi-purpose system BIKE based on the batch processing knowledge paradigm. This allowed to focus more on educational approach, i.e. TEL educational-driven and to finish the programming of the Internet application - network for feedback (communication between teachers and students). Thanks to this specialization, the results of applications in the teaching at MTF could gradually be presented at the international conferences focused on computer-enhanced engineering education. TEL was implemented at a detached workplace and four institutes involving more than 600 students-bachelors and teachers of technical subjects. Four study programmes were supported, including technical English language. Altogether, the results have been presented via 16 articles in five countries, including the EU level (IGIP-SEFI).

Keywords

  • Technology Enhanced Learning
  • Computer Assisted Learning
  • Batch Knowledge Processing
Open Access

Influence of Retardants to Burning Lignocellulosic Materials

Published Online: 21 Sep 2011
Page range: 115 - 123

Abstract

Influence of Retardants to Burning Lignocellulosic Materials

The paper deals with monitoring retardant changes of lignocellulosic materials. Combustion of lignocellulosic materials and fire-technical characteristics are described. In assessing the retarding effect of salt NH4H2PO4, fire-technical characteristics as limiting oxygen index (LOI) were measured, and by using thermoanalytical TG and DSC methods. High-temperature process of cellulose degradation at various flame concentrations was studied.

Keywords

  • burning
  • fire-technical characteristics
  • limiting oxygen index
  • thermal analysis