Junji Sugiyama
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View article: Formation of disordered regions is caused by drying in cellulose microfibrils of Egeria densa
Formation of disordered regions is caused by drying in cellulose microfibrils of Egeria densa Open
Periodically disordered regions can be induced by drying in cellulose microfibrils of several plant species. In this study, cellulose nanocrystals were prepared from never-dried and oven-dried cellulose samples from Egeria densa by sulfuri…
View article: Paralimibaculum aggregatum gen. nov. sp. nov. and Biformimicrobium ophioploci gen. nov. sp. nov., two novel heterotrophs from brittle star Ophioplocus japonicus
Paralimibaculum aggregatum gen. nov. sp. nov. and Biformimicrobium ophioploci gen. nov. sp. nov., two novel heterotrophs from brittle star Ophioplocus japonicus Open
Two novel Gram-stain-negative, strictly aerobic, halophilic and non-motile bacterial strains, designated NKW23 T and NKW57 T , were isolated from a brittle star Ophioplocus japonicus collected from a tidal pool in Wakayama, Japan. The resu…
View article: Quantitative morphological transformation of vascular bundles in the culm of moso bamboo (Phyllostachys pubescens)
Quantitative morphological transformation of vascular bundles in the culm of moso bamboo (Phyllostachys pubescens) Open
Vascular bundles of bamboo are determinants for mechanical properties of bamboo material and for physiological properties of living bamboo. The morphology of vascular bundles reflecting mechanical and physiological functions differs not on…
View article: Potential of machine learning approaches for predicting mechanical properties of spruce wood in the transverse direction
Potential of machine learning approaches for predicting mechanical properties of spruce wood in the transverse direction Open
To predict the mechanical properties of wood in the transverse direction, this study used machine learning to extract the anatomical features of wood from cross-sectional stereograms. Specimens with different orientations of the ray parenc…
View article: Intra-annual fluctuation in morphology and microfibril angle of tracheids revealed by novel microscopy-based imaging
Intra-annual fluctuation in morphology and microfibril angle of tracheids revealed by novel microscopy-based imaging Open
Woody cells, such as tracheids, fibers, vessels, rays etc., have unique structural characteristics such as nano-scale ultrastructure represented by multilayers, microfibril angle (MFA), micro-scale anatomical properties and spatial arrange…
View article: Examination of Cinnamomum camphora interlocked grain adopting X-ray computed tomography combined with particle image velocimetry
Examination of Cinnamomum camphora interlocked grain adopting X-ray computed tomography combined with particle image velocimetry Open
Trees develop wood grain more or less parallel to the tree axis as they grow laterally. However, many tree species also develop interlocked grain that is expressed as a change in the wood grain orientation, periodically switching between l…
View article: Flexural behavior of wood in the transverse direction investigated using novel computer vision and machine learning approach
Flexural behavior of wood in the transverse direction investigated using novel computer vision and machine learning approach Open
A deep-learning-based semantic segmentation approach (U-Net) was used to partition the anatomical features in the cross-section of hinoki ( Chamaecyparis obtusa ) wood during a micro three-point bending test. Using the Crocker–Grier linkin…
View article: Wood Classification of Japanese Fagaceae using Partial Sample Area and Convolutional Neural Networks
Wood Classification of Japanese Fagaceae using Partial Sample Area and Convolutional Neural Networks Open
Wood identification is regularly performed by observing the wood anatomy, such as colour, texture, fibre direction, and other characteristics. The manual process, however, could be time consuming, especially when identification work is req…
View article: Histochemical Structure and Tensile Properties of Birch Cork Cell Walls
Histochemical Structure and Tensile Properties of Birch Cork Cell Walls Open
Tensile tests of birch cork were performed in the tangential direction. Birch cork in the wet state showed significantly higher extensibility and toughness than those in the oven-dried state. The histochemical structure of birch cork was i…
View article: Evaluation of image partitioning strategies for preserving spatial information of cross-sectional micrographs in automated wood recognition of Fagaceae
Evaluation of image partitioning strategies for preserving spatial information of cross-sectional micrographs in automated wood recognition of Fagaceae Open
Although wood cross sections contain spatiotemporal information regarding tree growth, computer vision-based wood identification studies have traditionally favored disordered image representations that do not take such information into acc…
View article: Flexural anisotropy of rift-sawn softwood boards induced by the end-grain orientation
Flexural anisotropy of rift-sawn softwood boards induced by the end-grain orientation Open
Inspired by the use of rift-sawn softwood board for covering curved surfaces in Kokerabuki, a traditional Japanese roofing method, we investigated the flexural anisotropy of wood caused by its end-grain orientation. We measured the flexura…
View article: Wood Identification of Tea Rooms in the Urasenke Residence Designated as an Important Cultural Property
Wood Identification of Tea Rooms in the Urasenke Residence Designated as an Important Cultural Property Open
近年，茶室における樹種識別調査と用材観解明の重要性が周知されてきている。本研究では，裏千家を代表する茶室でもある京都府京都市に位置する重要文化財裏千家住宅保存修理工事において，63試料について光学顕微鏡および放射光X線µCTによる樹種識別調査を行った。その結果16種類もの木材が使用されていたことが判明した。中でも，咄々斎では，床柱や床框に珍しいマタタビ属（Actinidia）が使用されていることも判明するなど，当時の裏千家における茶室建築における木材利用，ならびに用材観の解…
View article: Wood identification of two anatomically similar Cupressaceae species based on two-dimensional microfibril angle mapping
Wood identification of two anatomically similar Cupressaceae species based on two-dimensional microfibril angle mapping Open
Identifying two anatomically similar species of Cupressaceae, Chamaecyparis obtusa and Thujopsis spp., is important to better understand the culture of wood use in Japan. However, the conventional method, which involves observing their cro…
View article: Exploration of wood species at Enggano Island: Identification and fiber morphology measurements
Exploration of wood species at Enggano Island: Identification and fiber morphology measurements Open
The objectives of this exploration were to identify and characterize the lesser-known wood species in Enggano island, and to find the suitability especially for construction and sawn-timbers. Wood samples were taken by drilling the trees t…
View article: Classification of Wood Species Frequently Used for Modern and Ancient Buildings Utilizing Near-Infrared Spectroscopy with Multivariate Analysis and Enhancement of Its Generalization Performance
Classification of Wood Species Frequently Used for Modern and Ancient Buildings Utilizing Near-Infrared Spectroscopy with Multivariate Analysis and Enhancement of Its Generalization Performance Open
近赤外分光法は，樹種間におけるわずかな化学成分の違いを検出することにより，顕微鏡観察では不可能であった樹種の識別を可能とする。本研究では，近赤外分光と多変量解析ならびに特徴量選択法を用いることにより，日本の建築用材として重要かつ解剖学的に類似する樹種であるヒノキ・アスナロ属，ならびにツガとベイツガの識別について検討した。これに加えて，ヒノキ・アスナロ属の現生材で構築されたモデルを用いて伝統建築に使われたヒノキ・アスナロ属古材の識別も実施した。現生材の場合は，9割近い精度で識…
View article: Anatomical Properties and Near Infrared Spectra Characteristics of Four Shorea Species from Indonesia
Anatomical Properties and Near Infrared Spectra Characteristics of Four Shorea Species from Indonesia Open
This study investigated the anatomical properties and absorbance characteristics of NIR spectra of four Shorea species from Indonesia. Macroscopic section revealed that Balau has similarity with Heavy Red Meranti, whereas White Meranti was…
View article: Spectral observation of agarwood by infrared spectroscopy: The differences of infected and normal Aquilaria microcarpa
Spectral observation of agarwood by infrared spectroscopy: The differences of infected and normal Aquilaria microcarpa Open
Adi DS, Hwang SW, Pramasari DA, Amin Y, Widyaningrum BA, Darmawan T, Septiana E, Dwianto W, Sugiyama J. 2020. Spectral observation of agarwood by infrared spectroscopy: The differences of infected and normal Aquilaria microcarpa. Biodivers…
View article: Wood Identification of Historical Architecture in Korea by Synchrotron X-ray Microtomography-Based Three-Dimensional Microstructural Imaging
Wood Identification of Historical Architecture in Korea by Synchrotron X-ray Microtomography-Based Three-Dimensional Microstructural Imaging Open
For visual inspection-based wood identification, optical microscopy techniques typically require a relatively large sample size, and a scanning electron microscope requires a clean surface. These novel techniques experience limitations for…
View article: Structural changes in sugarcane bagasse cellulose caused by enzymatic hydrolysis
Structural changes in sugarcane bagasse cellulose caused by enzymatic hydrolysis Open
Cellulose I is not completely saccharified to glucose at a low cellulase concentration. In this study, sugarcane cellulose saccharification residues were investigated. Transmission electron microscopy images indicated that the cellulose mi…
View article: Evaluation of a model using local features and a codebook for wood identification
Evaluation of a model using local features and a codebook for wood identification Open
We designed a model for wood identification based on scale-invariant feature transform (SIFT) descriptors and a codebook. A dataset consisting of cross-sectional optical micrographs of the Lauraceae family including 39 species was used for…
View article: Anatomical traits of Cryptomeria japonica tree rings studied by wavelet convolutional neural network
Anatomical traits of Cryptomeria japonica tree rings studied by wavelet convolutional neural network Open
Tree ring analysis is an important field of science, and is vital in modeling the environmental response system of tree growth. In most cases, analyses have been conducted using one parameter from one tree ring, e.g., ring-width, density, …
View article: Two-dimensional microfibril angle mapping via polarization microscopy for wood classification
Two-dimensional microfibril angle mapping via polarization microscopy for wood classification Open
A new method is presented for measuring microfibril angles (MFAs) from transverse tree sections by using polarized optical microscopy combined with a liquid-crystal tunable filter. The MFA transition analysis of tree growth rings via gener…
View article: Neural network for classification of Chinese zither panel wood via near-infrared spectroscopy
Neural network for classification of Chinese zither panel wood via near-infrared spectroscopy Open
The wood grade used for Chinese zither panels is primarily determined through an artificial experience method, and the number of related practitioners is decreasing annually. In this study, a method using an improved BP neural network is p…