Issues

Journal & Issues

Volume 22 (2022): Issue 5 (October 2022)

Volume 22 (2022): Issue 4 (August 2022)

Volume 22 (2022): Issue 3 (June 2022)

Volume 22 (2022): Issue 2 (April 2022)

Volume 22 (2022): Issue 1 (February 2022)

Volume 21 (2021): Issue 6 (December 2021)

Volume 21 (2021): Issue 5 (October 2021)

Volume 21 (2021): Issue 4 (August 2021)

Volume 21 (2021): Issue 3 (June 2021)

Volume 21 (2021): Issue 2 (April 2021)

Volume 21 (2021): Issue 1 (February 2021)

Volume 20 (2020): Issue 5 (October 2020)

Volume 20 (2020): Issue 4 (August 2020)

Volume 20 (2020): Issue 3 (June 2020)

Volume 20 (2020): Issue 2 (April 2020)

Volume 20 (2020): Issue 1 (February 2020)

Volume 19 (2019): Issue 6 (December 2019)

Volume 19 (2019): Issue 5 (October 2019)

Volume 19 (2019): Issue 4 (August 2019)

Volume 19 (2019): Issue 3 (June 2019)

Volume 19 (2019): Issue 2 (April 2019)

Volume 19 (2019): Issue 1 (February 2019)

Volume 18 (2018): Issue 6 (October 2018)

Volume 18 (2018): Issue 5 (October 2018)

Volume 18 (2018): Issue 4 (August 2018)

Volume 18 (2018): Issue 3 (June 2018)

Volume 18 (2018): Issue 2 (April 2018)

Volume 18 (2018): Issue 1 (February 2018)

Volume 17 (2017): Issue 6 (December 2017)

Volume 17 (2017): Issue 5 (October 2017)

Volume 17 (2017): Issue 3 (June 2017)

Volume 17 (2017): Issue 2 (April 2017)

Volume 17 (2017): Issue 1 (February 2017)

Volume 16 (2016): Issue 6 (December 2016)

Volume 16 (2016): Issue 5 (October 2016)

Volume 16 (2016): Issue 4 (August 2016)

Volume 16 (2016): Issue 3 (June 2016)

Volume 16 (2016): Issue 2 (April 2016)

Volume 16 (2016): Issue 1 (February 2016)

Volume 15 (2015): Issue 6 (December 2015)

Volume 15 (2015): Issue 5 (October 2015)

Volume 15 (2015): Issue 4 (August 2015)

Volume 15 (2015): Issue 3 (June 2015)

Volume 15 (2015): Issue 2 (April 2015)

Volume 15 (2015): Issue 1 (February 2015)

Volume 14 (2014): Issue 6 (December 2014)

Volume 14 (2014): Issue 5 (October 2014)

Volume 14 (2014): Issue 4 (August 2014)

Volume 14 (2014): Issue 3 (June 2014)

Volume 14 (2014): Issue 2 (April 2014)

Volume 14 (2014): Issue 1 (February 2014)

Volume 13 (2013): Issue 6 (December 2013)

Volume 13 (2013): Issue 5 (October 2013)

Volume 13 (2013): Issue 4 (August 2013)

Volume 13 (2013): Issue 3 (June 2013)

Volume 13 (2013): Issue 2 (April 2013)

Volume 13 (2013): Issue 1 (February 2013)

Volume 12 (2012): Issue 6 (December 2012)

Volume 12 (2012): Issue 5 (October 2012)

Volume 12 (2012): Issue 4 (August 2012)

Volume 12 (2012): Issue 3 (June 2012)

Volume 12 (2012): Issue 2 (April 2012)

Volume 12 (2012): Issue 1 (February 2012)

Volume 11 (2011): Issue 6 (December 2011)

Volume 11 (2011): Issue 5 (October 2011)

Volume 11 (2011): Issue 4 (August 2011)

Volume 11 (2011): Issue 3 (June 2011)

Volume 11 (2011): Issue 2 (April 2011)

Volume 11 (2011): Issue 1 (February 2011)

Volume 10 (2010): Issue 6 (December 2010)

Volume 10 (2010): Issue 5 (October 2010)

Volume 10 (2010): Issue 4 (August 2010)

Volume 10 (2010): Issue 3 (June 2010)

Volume 10 (2010): Issue 2 (April 2010)

Volume 10 (2010): Issue 1 (February 2010)

Volume 9 (2009): Issue 6 (December 2009)

Volume 9 (2009): Issue 5 (October 2009)

Volume 9 (2009): Issue 4 (August 2009)

Volume 9 (2009): Issue 3 (June 2009)

Volume 9 (2009): Issue 2 (April 2009)

Volume 9 (2009): Issue 1 (February 2009)

Volume 8 (2008): Issue 6 (December 2008)

Volume 8 (2008): Issue 5 (October 2008)

Volume 8 (2008): Issue 4 (August 2008)

Volume 8 (2008): Issue 3 (June 2008)

Volume 8 (2008): Issue 2 (April 2008)

Volume 8 (2008): Issue 1 (February 2008)

Journal Details
Format
Journal
eISSN
1335-8871
First Published
07 Mar 2008
Publication timeframe
6 times per year
Languages
English

Search

Volume 9 (2009): Issue 2 (April 2009)

Journal Details
Format
Journal
eISSN
1335-8871
First Published
07 Mar 2008
Publication timeframe
6 times per year
Languages
English

Search

4 Articles
Open Access

On Size-Biased Negative Binomial Distribution and its Use in Zero-Truncated Cases

Published Online: 29 May 2009
Page range: 33 - 35

Abstract

On Size-Biased Negative Binomial Distribution and its Use in Zero-Truncated Cases

A size-biased negative binomial distribution, a particular case of the weighted negative binomial distribution, taking the weights as the variate values has been defined. A Bayes' estimator of size-biased negative binomial distribution (SBNBD) has been obtained by using non-informative and gamma prior distributions. Also comparison has been made of this estimator with the corresponding maximum likelihood estimator (MLE) with the help of R- Software.

Keywords

  • size-biased negative binomial distribution
  • Bayes' estimator
  • R- Software
Open Access

Analysis and Modeling of the Galvanic Skin Response Spontaneous Component in the context of Intelligent Biofeedback Systems Development

Published Online: 29 May 2009
Page range: 36 - 41

Abstract

Analysis and Modeling of the Galvanic Skin Response Spontaneous Component in the context of Intelligent Biofeedback Systems Development

The paper presents an approach to galvanic skin response (GSR) spontaneous component analysis and modeling. In the study a classification of biofeedback training methods is given, importance of intelligent methods development is shown. The INTENS method, which is perspective for intellectualization, is presented. An important problem of biofeedback training method intellectualization - estimation of the GSR spontaneous component - is solved in the main part of the work. Its main characteristics are described; results of GSR spontaneous component modeling are shown. Results of small research of an optimum material for GSR probes are presented.

Keywords

  • galvanic skin response
  • spontaneous reactions
  • biofeedback
  • skin conductivity measurement
  • intelligent
  • modeling
Open Access

Astronavigation System as an Autonomous Enhancement Suite for a Strapdown Inertial Navigation System: An Evaluation

Published Online: 29 May 2009
Page range: 42 - 48

Abstract

Astronavigation System as an Autonomous Enhancement Suite for a Strapdown Inertial Navigation System: An Evaluation

The determination of spacecraft coordinates is embodied by a navigation solution with high degree of autonomy, high precision and reliability. The foremost requirement for the solution of this problem is a strapdown inertial navigation system (SINS), which is autonomous, reliable and jamming resistant, but at the same time, errors in SINS increase with time. Therefore, for the SINS eiror correction, astronavigation system (ANS) is used as an additional navaid. This paper considers the ANS as an enhancement source for the SINS and presents its theoretical and practical aspects. The typical ANS makes use of star-trackers which are expensive, complicated in their structure and demand a-priori definition and vigilant preparation of each onboard attitude fix. To make this system cost effective and simple, an advanced configuration employs a charge coupled device (CCD) based star sensor rigidly mounted on a strapdown inertial measurement unit (SIMU). Consequently, in this evaluation, the ANS makes use of CCD based star sensors. Simulation results are presented to demonstrate the validity of the method for improving the navigation reliability and performance.

Keywords

  • Astronavigation
  • inertial navigation
  • Kalman filter
  • spacecraft
  • star sensor
Open Access

Precision Measurement of Cylinder Surface Profile on an Ultra-Precision Machine Tool

Published Online: 29 May 2009
Page range: 49 - 52

Abstract

Precision Measurement of Cylinder Surface Profile on an Ultra-Precision Machine Tool

This paper describes the measurement of the surface straightness profile of a cylinder workpiece on an ultra-precision machine tool which has a T-base design with a spindle, an X-slide and a Z-slide. The movement range of the X-slide is 220 mm and that of the Z-slide is 150 mm, which have roller bearings in common. Two capacitive sensors are employed to scan a cylinder workpiece mounted on the spindle along the Z-axis. The straightness error motion of the Z-slide is measured to be approximately 100 nm by the reversal method. The straightness profile of the cylinder workpiece is evaluated to be approximately 400 nm by separation of the motion error, simultaneously.

Keywords

  • Measurement
  • Surface Profile
  • Error Motion
  • Straightness
  • Machine Tool
  • Slide
  • Reversal Method
4 Articles
Open Access

On Size-Biased Negative Binomial Distribution and its Use in Zero-Truncated Cases

Published Online: 29 May 2009
Page range: 33 - 35

Abstract

On Size-Biased Negative Binomial Distribution and its Use in Zero-Truncated Cases

A size-biased negative binomial distribution, a particular case of the weighted negative binomial distribution, taking the weights as the variate values has been defined. A Bayes' estimator of size-biased negative binomial distribution (SBNBD) has been obtained by using non-informative and gamma prior distributions. Also comparison has been made of this estimator with the corresponding maximum likelihood estimator (MLE) with the help of R- Software.

Keywords

  • size-biased negative binomial distribution
  • Bayes' estimator
  • R- Software
Open Access

Analysis and Modeling of the Galvanic Skin Response Spontaneous Component in the context of Intelligent Biofeedback Systems Development

Published Online: 29 May 2009
Page range: 36 - 41

Abstract

Analysis and Modeling of the Galvanic Skin Response Spontaneous Component in the context of Intelligent Biofeedback Systems Development

The paper presents an approach to galvanic skin response (GSR) spontaneous component analysis and modeling. In the study a classification of biofeedback training methods is given, importance of intelligent methods development is shown. The INTENS method, which is perspective for intellectualization, is presented. An important problem of biofeedback training method intellectualization - estimation of the GSR spontaneous component - is solved in the main part of the work. Its main characteristics are described; results of GSR spontaneous component modeling are shown. Results of small research of an optimum material for GSR probes are presented.

Keywords

  • galvanic skin response
  • spontaneous reactions
  • biofeedback
  • skin conductivity measurement
  • intelligent
  • modeling
Open Access

Astronavigation System as an Autonomous Enhancement Suite for a Strapdown Inertial Navigation System: An Evaluation

Published Online: 29 May 2009
Page range: 42 - 48

Abstract

Astronavigation System as an Autonomous Enhancement Suite for a Strapdown Inertial Navigation System: An Evaluation

The determination of spacecraft coordinates is embodied by a navigation solution with high degree of autonomy, high precision and reliability. The foremost requirement for the solution of this problem is a strapdown inertial navigation system (SINS), which is autonomous, reliable and jamming resistant, but at the same time, errors in SINS increase with time. Therefore, for the SINS eiror correction, astronavigation system (ANS) is used as an additional navaid. This paper considers the ANS as an enhancement source for the SINS and presents its theoretical and practical aspects. The typical ANS makes use of star-trackers which are expensive, complicated in their structure and demand a-priori definition and vigilant preparation of each onboard attitude fix. To make this system cost effective and simple, an advanced configuration employs a charge coupled device (CCD) based star sensor rigidly mounted on a strapdown inertial measurement unit (SIMU). Consequently, in this evaluation, the ANS makes use of CCD based star sensors. Simulation results are presented to demonstrate the validity of the method for improving the navigation reliability and performance.

Keywords

  • Astronavigation
  • inertial navigation
  • Kalman filter
  • spacecraft
  • star sensor
Open Access

Precision Measurement of Cylinder Surface Profile on an Ultra-Precision Machine Tool

Published Online: 29 May 2009
Page range: 49 - 52

Abstract

Precision Measurement of Cylinder Surface Profile on an Ultra-Precision Machine Tool

This paper describes the measurement of the surface straightness profile of a cylinder workpiece on an ultra-precision machine tool which has a T-base design with a spindle, an X-slide and a Z-slide. The movement range of the X-slide is 220 mm and that of the Z-slide is 150 mm, which have roller bearings in common. Two capacitive sensors are employed to scan a cylinder workpiece mounted on the spindle along the Z-axis. The straightness error motion of the Z-slide is measured to be approximately 100 nm by the reversal method. The straightness profile of the cylinder workpiece is evaluated to be approximately 400 nm by separation of the motion error, simultaneously.

Keywords

  • Measurement
  • Surface Profile
  • Error Motion
  • Straightness
  • Machine Tool
  • Slide
  • Reversal Method

Plan your remote conference with Sciendo