Weave types of commercial woven fabrics were determined by analysing the two-dimensional Fourier transformation patterns of the reflected images. Data collection and data analysis were done by image processing system based on a microcomputer. The relationships between the structural units of weave types and the Fourier power spectra are summarized as follows: (1) structural unit is observed in the unit cell defined by the neighboring two warp yarns and two filling yarns in Fourier space, (2) weave harrness is obtained by counting the number of power spectra inside the unit cell, (3) structural unit is equivalent to the Fourier power spectrum arrangement of the reflected image rotated by 90 degree.

View full abstract

This report theoretically studies the process in which clothes were obtained, kept and scrapped and tries to clarify its relation to the surveyed data.
The theory which was an application of Queuing theory was able to satisfactorily explain the process, by dividing it into two cases. The first case was the non-equilibrium condition which was applied to the students.
The second case was the equilibrium condition which was applied to the adults.
Main results were as follows.
(1) The distribution of obtaining clothes was provided to be Poisson distribution.
(2) In the non-equilibrium condition, an equation to express the number of possessed clothes which varied in years, was introduced. All characteristic values in this equation were calculated from the surveyed data. By means of the statistic test, it was proved that this equation was appropritate to some surveyed data.
(3) By using obtained values and equations, the number of possessed clothes in some years after was forecast.
(4) In the equilibrium condition, the equation was obtained as a special case of non-equilibrium condition. As the application of the results, the life span of the clothes was introduced.

View full abstract

The static charge (voltage) and it's decay curve of rubbed fabric are measured and recorded automatically by the newly developed KB system. The accuracy and reproducibility of the KB system have been compared with those of existing Rotary Static Tester and Faraday's Cage Method prescribed in the Japanese Industrial Standard (JIS). It has been proved that the KB system has higher accuracy, higher reproducibility and lower variation than those of the existing methods.

View full abstract