All issues
Volume 43, Issue 1
Displaying 1-3 of 3 articles from this issue
- |<
- <
- 1
- >
- >|
-
Part 2: Judgement by Fuzzy InferenceShigeru Komai, Yohzo Yamada1997 Volume 43 Issue 1 Pages 1-8
Published: 1997
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSThe purpose of this paper is to develop a color difference judging method, in which we introduce the standard region of color difference judgement by an expert who engages in the color inspection on woven fabrics.
In our color judging method by Fuzzy inference, we construct standard value, limited value and tilt angle for every element region into which CIELAB color space is divided.
The membership functions used in Fuzzy inference rules are designed in correspondence to color discriminating region of an expert which defines standard values and limited values for judgement. The optimization coefficient ki (I=1-4) which optimizes membership functions is used to apply color difference judgement to whole color space. Therefore this method enables us to carry out the color difference judgement by Fuzzy inference whenever the reference color value exists in CIELAB.
As the result of the computer simulation using fabric samples, we pointed out that the present method is useful in constructing the color difference judgement system which is equivalent to the visual judgement by an expert.View full abstractDownload PDF (1133K) -
Part 3: Comparison between experts and non-expertsShigeru Komai, Yohzo Yamada, Takashi Harada1997 Volume 43 Issue 1 Pages 9-13
Published: 1997
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSThe purpose of this paper is to make a quantitative study of the color difference judgement of woven fabrics between experts and non-experts by using the color judging method by approximate ellipse in CIE L*a*b* color space.
1) The level of color difference judgement of experts is about twice or three times higher than that of non-experts. That level of non-expert-women in the first half of their twenties is closer to the expert level than that of non-expertmen in the half of their thirties.
2) The dispersion of color difference judgement among experts is small and their judgement is more stable than that of non-experts. The dispersion among non-expert-men in their early thirties in inspecting dark blue which strict judgement is about twice larger than that among experts.View full abstractDownload PDF (660K) -
Jinlian Hu1997 Volume 43 Issue 1 Pages 14-20
Published: 1997
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSIn the present study, the concept of twist redistribution of folded yarns in a woven fabrics is introduced and the reasons for the twist redistribution of folded yarns have been given.
Two pure cotton woven fabrics are compared. These two fabrics have similar industrial specifications, except that one is made of 100s/2 folded yarns, the other of single sis yarns. Using the concept of twist redistribution of folded yarns in a woven fabric and variation of yarns in a woven fabric, this paper makes use of these two fabrics to explain why 100s/2 woven fabrics are becoming more and more popular or how the folded yarn fabrics are superior to the single yarn fabrics.
Through comparing the measured geometrical and mechanical properties of these two fabrics, it is shown that, in addiction to their better appearance than 50s woven fabrics, 100s/2 fabrics have better quality in terms of mechanical properties and handle.
It is believed that the twist redistribution takes place during the formation of woven fabric made of folded yarns. However, it may be more realistic to see the redistribution as a tendency rather than an exact relationship between fabric sett and yarn twist.View full abstractDownload PDF (1688K)
- |<
- <
- 1
- >
- >|