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Nara-shi, Japan

Kobayashi K.,Kyoto University | Akada M.,Kyushu National Museum | Torigoe T.,Nara National Museum | Imazu S.,Kyushu National Museum | Sugiyama J.,Kyoto University
Journal of Wood Science | Year: 2015

The identification of wood species used in the cultural artifacts is important in terms of their preservation and inheritance. However, a nondestructive method is required, and wood samples must be partly cut off in conventional methods such as microscopy. In this study, we constructed a novel system for wood identification using image recognition of X-ray computed tomography images of eight major species used in Japanese wooden sculptures. Texture analyses of the computed tomography images were carried out using the gray-level co-occurrence matrix, from which 15 textural features were calculated. The k-nearest-neighbor algorithm combined with cross validation was applied for classification and evaluation of the system. Input datasets with a variation in image qualities (resolution, gray level, and image size) were investigated using this novel system, and the accuracy was greater than 98 % when the input images had a certain quality level. Although there are still technical problems to be overcome, progress in the development of automated identification is extremely encouraging in that such an approach has the potential to make a valuable contribution in adding scientific species notion to the artifacts; otherwise, only the literal documents are available. © 2015 The Author(s)

Himmi S.K.,Kyoto University | Himmi S.K.,Indonesian Institute of Sciences | Yoshimura T.,Kyoto University | Yanase Y.,Kyoto University | And 3 more authors.
Journal of Wood Science | Year: 2014

The nesting biology of the drywood termite, Incisitermes minor, is poorly understood. To date, no published data are available regarding the in situ nest-gallery development of I. minor. Three naturally infested Sitka spruce (Picea sitchensis Bong. Carriere) timbers were analyzed by X-ray computer tomography to observe the structure of the first royal chamber and the termite's nest-founding behavior. One timber was infested by a group of termites which emerged from their natal nest. The other two timbers were infested by dealate reproductives from the nuptial flight. The study revealed that the drywood termite engages in outside foraging activity and has great foraging flexibility. Computer tomographic images also revealed that I. minor reproductives showed anatomical selectivity in their nest-founding activity. The structure of the initial royal chambers varied to follow the anatomical texture of the timbers, which resembled either a European pear shape or a cashew nut shape. © 2014 The Japan Wood Research Society.

Himmi S.K.,Kyoto University | Himmi S.K.,Indonesian Institute of Sciences | Yoshimura T.,Kyoto University | Yanase Y.,Kyoto University | And 3 more authors.
Wood Science and Technology | Year: 2016

Termite nest architecture has important biological attributes, as the whole structure represents a morphological expression of the sum of behavioral patterns which relate to a better understanding of their feeding ecology. The nest-gallery system of the western drywood termite, Incisitermes minor, inside naturally infested wood was visualized by X-ray computed tomography. Drywood termites are considered one-piece nesters; therefore, studying the anatomical properties of wood could increase the insight into those factors that influence the mechanisms used when the nest-gallery system is established. The interactions between the I. minor colony and environment, represented by the wood’s anatomical properties of fibers and growth rings, generate a distinctive and unique foraging pattern, which lead to selective excavation of the nest-gallery system. The results indicated that drywood termites exhibited continual adaptation to their environment as well as self-organization, similar traits of foraging and nesting biology can also be found in intermediate and separate nesters, however, at a different ecological scale. © 2016 Springer-Verlag Berlin Heidelberg

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