Hiroyuki Kanai

Identification of Principal Factors of Fabric Aesthetics by the Evaluation from Experts on Textiles and from Untrained Consumers

One of the important end-use performance measures of fabrics and other textile products is the handle, which measures the quality of fabrics as evaluated by reactions obtained not only tactilely but also visually. The well-known Kawabata Evaluation System includes both an objective evaluation and a prediction method of the handle. However, objective evaluations of the handle based on a visual perception of fabric aesthetics have not been investigated systematically. Thus, as the first step of a systematic study, we attempted to carry out a sensory evaluation of fabric aesthetics by experts on textile and untrained consumers using worsted and spun silk woven fabrics, which have different material effect and structural effect. Thereafter, the mean preference scores were examined by factor analysis to identify the principal factors of fabric aesthetics. From the result, it was found that two common factors—‘luster and depth sensation’ and ‘surface roughness sensation’—were identified tentatively as the principal factors of fabric aesthetics.

Non-invasive blood glucose measurement based on ATR infrared spectroscopy

This paper describes a new noninvasive measurement of blood glucose based on an Infrared spectroscopy. This measured the spectrum of human finger by using the Fourier transform infrared spectroscopy of attenuated total reflection. In this study, the time dependencies of the accuracy of the calibration models were examined.

Application of the Infrared Spectroscopy to the Medical Instruments

In the medical field, medical instruments used in the operations should be measured their purification level after the washing and sterilization process, because it is necessary to evaluate them to be clear excellent. However, some problems existed in a current evaluation of purification level. The qualitative and the quantitative evaluation were not enough, and the residual detergent on them has been the other problem. Then, we examined an application of the Fourier transform infrared spectroscopy to qualitative and the quantitative evaluation concerning the soil in this research. This paper aims to propose a new evaluation of purification level. This measurement system is able to evaluate purification level promptly and accurately. In addition, this measurement system needs no preprocessing in every measurement. As a characteristic of measurement, anyone could use this system, and there is not influence of individual difference

Optical Coherence Domain Mid-infrared Spectroscopy

The infrared spectroscopy is widely used as an analysis method of the chemical today. On the other hand, the technology that enables structural information acquisition in compound quality by OCT (Optical Coherence Tomography) develops, too. In this research, it aimed to develop measurement technique of non destructive and non contact of three dimension structure in a new technique for combining these. The measurement system was constructed by using low coherence light source and Michelson interferometer for the verification of principle, and in this thesis, it is a model sample in a known multilayer structure was used and examined. As a result, the possibility of obtaining the location information and element information on each level of model sample was able to be shown. It will aim at a three dimensional mapping in the future and it aims at doing qualitative and quantitative fault image measurement system achievement, and the application is developed

Surface Roughness Evaluation by Laser Speckle

This study describes the novel evaluation method of surface roughness by laser speckle. We observed the reflectance speckle patterns of seven sample metal plates that have different surface roughness. Thereafter, by using computed correlation functions from these patterns that includes information of surface form. By counting the peak on the line profile in horizontal direction of the correlation function, we tried the quantification of surface roughness. On the other hand, we measured surface roughness of the samples by the contact stylus instrument. Five parameters, such as Ra, Ry Rz, Pc, and Sm were measured. We compared the peak number of correlation function with JIS parameters. As the result, it became clear that the peak number is in proportion to JIS parameter. In a word, JIS parameters could be measured based on the peak number of correlation functions. This evaluation method by laser speckle could give the surface roughness of a sample rapidly in non-destructive and non-contact. It takes about 3 seconds to get the surface roughness of a sample.

Microscopic photometry and its parameterization for objective evaluation of aesthetics of woven fabrics

One of the most important end-use performance parameters for fabrics and other textile products are the fabric hands and fabric aesthetics. Our previous research attempted to elucidate the factors that affect the fabric aesthetics using factor analysis and identified two principal factors tentatively labelled as ‘lustre and depth sensation’ and ‘surface roughness sensation’. The focus of the second step in the study of fabric aesthetics is on the investigation of the objective trends in the performance evaluation of textiles. In this study, we developed our own experimental equipment based on microscopic goniophotometric principles and its parameterization method. Subsequently, we attempted to define an index based on the distribution of the reflection intensity of woven fabrics and its characterization in order to evaluate the principal factors governing fabric aesthetics. On the basis of the results, we infer that microscopic goniophotometry and its parameterization is a more viable approach than conventional macroscopic goniophotometry for the quantitative evaluation of the principal factors governing fabric aesthetics.

Application of Laser Speckle method to Water Flow measurement in plant body

We examined the water flowing quantity measurement in the plant body using the laser speckle method in this research. We use a leaf part of a Pothos (Epipremnum aureum) that is the foliage plant, and a Japanese morning glory (Ipomoea nil) that is the garden plant as the test sample. We fixed the leaf of sample with two acrylic boards, and measured the speckle pattern that changes temporally continuously. We were able to obtain the image that seemed water flow in veins of a leaf of sample by calculating the integration value of two or more images. We also consider that this image expresses the activity of the plant though a precise value is uncertain. This method is noninvasive, needs few apparatuses, and can measure in short time. The application to forestry and agriculture is expected because this new method has these advantages. Especially, we think that it is also possible to combine and to use this new technique for a present field server system in agricultural sector

Exploratory Work on the Spinning Condition of the Structure of Staple-core Twin-spun Yarns

In order to design and develop novel-spun yarns with good functionality, we investigated how to construct a core-sheath structure adapted from a multilayered structure of triplet-spun yarn and/or made from a twin-spun yarn with core-staple fibers using an experimental ring-spinning frame. The results were follows: (1) staple-core twin-spun yarn, a new yarn, could be made by applying the production method of triplet-spun yarn and/or combining the production methods of core-spun yarn and twin-spun yarn into one twisting process; (2) by adopting three rovings made from fibers of differing length and fineness, the resulting triplet-spun yarn had the core-sheath structure within an adequate spinning condition; (3) for the construction of core-sheath structure, it is important that there be a difference between spinning tensions at the center and the two sides of the drafted fiber strands or drafted strand lengths from the front roller nip to the point of yarn formation by controlling the distance of the supply rovings and the yarn’s twist factor.

Evaluation of Lane Indication Performance Using CCD Image Sensor

This paper describes a construction of the measurement system for the lane indication performance in a real traffic environment. With this system we investigated the influence of the road pavement for lane indication performance in the sunny and rainy conditions, on daytime and nighttime

Construction of twin staple-core spun yarn with two points of yarn formation in one twisting process

In order to diversify the structure of spun yarn as textile material and to develop novel composite spun yarn with good functionality, we investigated how to construct single yarn with a twin staple-core and sheath structure and/or adopt the production method of triplet spun yarn using an experimental ring spinning frame. Fundamentally, the unique spinning conditions were not only the arrangement and the distances of three rovings and the twist level of yarn, but also the types of staple fibers. The following results were obtained: (1) by adopting the production method of triplet spun yarn with three rovings under the spinning condition with two differing roving distances, the yarn combining side-by-side and sheath-core structures could be constructed by two points of yarn formation and one twisting process without the device for controlling of spinning tension; (2) in the spinning method of twin staple-core spun yarn, it was necessary to control the difference between spinning tensions of the sheath layer and the twin staple-core layer with side-by-side structure under the spinning condition with the lower twist level of yarn and the greater difference between two roving distances; (3) for combining the twin staple-core and the sheath layers, it was important not only to control the greater length of drafted fiber strands for the sheath layer, but also to choose the cut length of the sheath and the core fibers.