• Journal of the Korean Wood Science and Technology
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• v.45 no.6
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• pp.797-808
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• 2017

Automatic wood species identification systems have enabled fast and accurate identification of wood species outside of specialized laboratories with well-trained experts on wood species identification. Conventional automatic wood species identification systems consist of two major parts: a feature extractor and a classifier. Feature extractors require hand-engineering to obtain optimal features to quantify the content of an image. A Convolutional Neural Network (CNN), which is one of the Deep Learning methods, trained for wood species can extract intrinsic feature representations and classify them correctly. It usually outperforms classifiers built on top of extracted features with a hand-tuning process. We developed an automatic wood species identification system utilizing CNN models such as LeNet, MiniVGGNet, and their variants. A smartphone camera was used for obtaining macroscopic images of rough sawn surfaces from cross sections of woods. Five Korean softwood species (cedar, cypress, Korean pine, Korean red pine, and larch) were under classification by the CNN models. The highest and most stable CNN model was LeNet3 that is two additional layers added to the original LeNet architecture. The accuracy of species identification by LeNet3 architecture for the five Korean softwood species was 99.3%. The result showed the automatic wood species identification system is sufficiently fast and accurate as well as small to be deployed to a mobile device such as a smartphone.

• Journal of the Korean Wood Science and Technology
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• v.44 no.6
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• pp.897-902
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• 2016

This study was conducted to identify wood species from main pillars of Daeungjeon Hall, the main building of Jeonghyesa Temple located in Suncheon, Jeollanamdo Province in Korea. It was known that this temple had been built in the $8^{th}$ century by Hyeso, a national master in the Unified Silla period, and was designated as Treasure No. 804 in 1984 due to its historic and academic values. The results of wood species identification showed that main pillars from Daeungjeon Hall of the Jeonghyesa Temple were made of hard pine, Korean fir (Abies spp.) and Zelkova tree (Zelkova spp.). In addition to the wood species identification, floor plan documentation was also done to help identify what wood species had been used for main pillars. These results could be applied and utilized for the conservation and restoration of Daeungjeon Hall in future. This study may help with the authenticity of conservation works.

• Journal of the Korean Wood Science and Technology
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• v.46 no.4
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• pp.402-414
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• 2018

Species identification of wood provides important information for archaeology, restoration of cultural assets, preventing illegal logging, and more. Wood species are usually identified based on their anatomical features with the use of a microscope. However, this method may not be able to distinguish between anatomically similar species or subspecies. To overcome this problem, wood species need to be identified at the molecular level using DNA sequencing. However, unlike living plant cells, wood is difficult to pulverize using a mortar, and DNA extraction from dried wood is challenging. To solve these problems, we propose a pretreatment method in which wood is pulverized using 60-grit sandpaper and hydrated with water for 2 days. Using this method, we were able to stably amplify the rpoB gene from the extracted DNA of Pinus rigida. In addition, sequence analysis of the rpoB gene revealed six single nucleotide polymorphisms (SNPs), which classified the rpoB sequences in the genus Pinus into five groups. Our data indicate that although these SNPs were not suitable for species identification, they can potentially be used to determine the origin of different wood subspecies or individual samples of wood.

• Korean Journal of Microbiology
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• v.19 no.3
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• pp.128-136
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• 1981

In order to investigate early identification of species of the wood-decaying fungi in the the mycelial stage, the authors isolated of 41 species, 28 genus, 9 family at 8 locations in Korea and cultivated these isolates on the various kinds of solid media. After investigating such cultural characteristics as oxidase reactions with tannic and gallic acid, various morphological features of colony and growth grade, appeared on the various media, the authors obtained the following results : 1. The oxidase reactions with tannic and gallic acid in the PDTA, DTA, PDGA and DGA media are available for identificantion of the wood-decaying fungi. 2. The oxidase reactions with guaiacol, pyrogallol and hydroquinone in the PDGUA, PDPA and PDHA media are not so much available for identification of the wood-decaying fungi. 3. Morphological features of colonies such as mycelium color, floccose, floccose-powdery, mycelloid, powdery-mycelloid, velvet, radiate, contoured, rosulate and growth grade on the PDA, PSA and PXA media are useful for identification of wood-decaying fungi. 4. It is believed that early identification in species level of wood-decaying fungi using cultural characteristics in the mycelial stage is possible. 5. The key for the identification of 41 species of wood-decaying fungi is proposed by the cultural characteristics using several solid media.

• Journal of the Korean Wood Science and Technology
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• v.15 no.1
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• pp.22-55
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• 1987

This study was executed to offer the basic data needed to plywood industry in Korea for the future based on microscopic wood features as our previous paper reported by the macroscopic features. Microscopic wood characteristics for 50 species selected by the viewpoint of possible utility in future were examined and described by the species. Also, keys for the identification based on microscopic features were briefly prepared and presented by gymnosperm and angiospenn respectively.

• Journal of the Korea Furniture Society
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• v.12 no.2
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• pp.39-47
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• 2001

This study was carried out to identify wood species excavated at the temple site of Backjae dynasty in Neungsanri, Buyeo. At the temple site, there were great excavations such as Backjae Incense Burner(National Treasure No.287) and Stone Reliquary(National Treasure No.288). The King Chang 13 Year carved on Stone Reliquary indicated that this temple was completed in A.D 567. Identification of wood species were as follows: The Temple building was constructed by Pinus densiflora Sieb. et Zucc. The species of the main pillar of Wooden Pagoda which preserved relics of the Buddha was Zelkova serrate Makino.

• Journal of the Korean Wood Science and Technology
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• v.46 no.3
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• pp.270-277
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• 2018

This study was conducted to identify wood species of two printing woodblocks either from the Park clan's documentary or Ji-dang documentary of Songok clan of the Milseong Park, Songok, Gyeongju, Korea. Eighty-eight woodblocks out of the total 282 woodblocks were randomly selected to compare anatomical features for the identification of wood species, using a light microscope. As a result, seven wood species were identified, and all of them were diffuse-porous hardwood species. The most significant portion, i.e., 39.8% of wood species was Carpinus laxiflora Blume. Then, Pyrus pyrifolia Nakai, Acer mono Maxim, Prunus sargentii Rehder, Tilia amurensis Rupr, Diospyros kaki Thunb, and Betula costata Trautv was 25.0%, 15.9%, 10.2%, 3.4%, 3.4% and 2.3%, respectively, indicating that all diffuse-porous hardwood species had been used for the woodblocks. It was believed that diffuse-porous hardwoods had been used because they provided an easy of engraving complex Chinese letters, of acquiring these wood species in Gyeongju areas, and a high resistance to repeated printing.

• Journal of the Korean Wood Science and Technology
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• v.49 no.6
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• pp.574-590
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• 2021

International efforts to prevent illegally logged wood are expanding around the world. The "Legal Wood Trade Promotion System" was enacted in Korea in 2019 to strengthen the legal import and distribution of commercial wood in Korea. Since then, this system has promoted and ensured that the imported wood and wood products are legal with respect to the country of origin, wood species, and harvested area. As verification methods, DNA analysis technology and anatomical analysis using a microscope are mainly used in conjunction. Therefore, in this study, wood species of plywood were identified by analyzing the anatomical characteristics of various wood products for the first time. Douglas fir (Pseudotsuga menziesii (Mirb.) Franco.) and larch (Larix kaempferi (Lamb.) Carriere) plywoods (7, 9 ply) were obtained from four companies that supply plywood in Korea. After cutting each company's plywood to a size of about 1 cm³, the layers from top to bottom were separated into single layers, and three sections were observed using an optical microscope. The results revealed that the plywood was composed of a mixture of softwood and hardwood wood species, pine wood species, poplar wood species, or a mixture of larch and pine wood species. Identification of wood species using microscopy is important and can enable the scientific analysis and verification of various wood products, including plywood, imported from countries where the likelihood of indiscriminate distribution of illegal wood and illegal logging is high.

• Journal of the Korea Furniture Society
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• v.26 no.2
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• pp.163-170
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• 2015

This study was conducted to identify wood species for 51 excavated wooden shoes in the 12~16 Chungjin district of Jongno. Wood species of 31 Pinus sp., 12 Torreya nucifera S. et Z., 4 Ginkgo biloba L., 2 Salix sp., 1 Kalopanax pictus (Thunb.) Nakai. and 1 Morus sp. were identified. Wood used for wooden shoes was a species that can be mainly obtained easily around. Among them, Torreya nucifera S. et Z. grows in warm temperate zone of Korea, which shows that interregional cooperation has occurred.

• Journal of the Korean Wood Science and Technology
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• v.43 no.3
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• pp.295-303
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• 2015

Daewungbojeon hall of Magoksa temple is a korean traditional wood building well representing Joseon Dynasty architecture in the 17th century. The purpose of this study was to identify the wood species of 42 wooden elements collected from Pillar (Gidung), Head-penetrating tie (Changbang), Pyeongbang, Angle rafter (Chunyeo), End-angle rafter (Sarae) and Hwalju. According to the microscopical investigation, Pillar, Head-penetrating tie, Pyeongbang and Hwalju were identified as domestic hard pine species. However, Chunyeo were identified as either Zelkova serrata Makino or Gingko biloba L. and Sarae as exotic hard pine species. It might be related to the high replace rate of wood elements for the roof. Especially, exotic hard pine species seem to be replaced in recent years when Daewungbojeon hall was repaired.