Journal of the Korean wood science and technology最新文献_第7页

Conversion of Glucose and Xylose to 5-Hydroxymethyl furfural, Furfural, and Levulinic Acid Using Ethanol Organosolv Pretreatment under Various Conditions 不同条件下乙醇-有机溶剂预处理葡萄糖和木糖制备5-羟甲基糠醛、糠醛和乙酰丙酸

Journal of the Korean wood science and technology Pub Date : 2022-11-01 DOI: 10.5658/wood.2022.50.6.475

K. Gwak, Chae-Hwi Yoon, Jong-Chan Kim, Jong-Hwa Kim, Young-Min Cho, I. Choi

引用次数: 0

Inhibition of Biofilm Formation in Yersinia enterocolitica by Edible Plant Extracts Including Polygoni Multiflori Radix 何首乌等可食植物提取物对小肠结肠炎耶尔森菌生物膜形成的抑制作用

Journal of the Korean wood science and technology Pub Date : 2022-11-01 DOI: 10.5658/wood.2022.50.6.448

Youngseok Ham, Tae-Jong Kim

引用次数: 0

Mask Region-Based Convolutional Neural Network (R-CNN) Based Image Segmentation of Rays in Softwoods 基于掩模区域的卷积神经网络（R-CNN）的软木光线图像分割

Journal of the Korean wood science and technology Pub Date : 2022-11-01 DOI: 10.5658/wood.2022.50.6.490

Hye-Ji Yoo, O. Kwon, Jeong-Wook Seo

{"title":"Mask Region-Based Convolutional Neural Network (R-CNN) Based Image\u0000 Segmentation of Rays in Softwoods","authors":"Hye-Ji Yoo, O. Kwon, Jeong-Wook Seo","doi":"10.5658/wood.2022.50.6.490","DOIUrl":"https://doi.org/10.5658/wood.2022.50.6.490","url":null,"abstract":"The current study aimed to verify the image segmentation ability of rays in tangential thin sections of conifers using artificial intelligence technology. The applied model was Mask region-based convolutional neural network (Mask R-CNN) and softwoods (viz. Picea jezoensis , Larix gmelinii , Abies nephrolepis , Abies koreana , Ginkgo biloba , Taxus cuspidata , Cryptomeria japonica , Cedrus deodara , Pinus koraiensis ) were selected for the study. To take digital pictures, thin sections of thickness 10–15 μm were cut using a microtome, and then stained using a 1:1 mixture of 0.5% astra blue and 1% safranin. In the digital images, rays were selected as detection objects, and Computer Vision Annotation Tool was used to annotate the rays in the training images taken from the tangential sections of the woods. The performance of the Mask R-CNN applied to select rays was as high as 0.837 mean average precision and saving the time more than half of that required for Ground Truth. During the image analysis process, however, division of the rays into two or more rays occurred. This caused some errors in the measurement of the ray height. To improve the image processing algorithms, further work on combining the fragments of a ray into one ray segment, and increasing the precision of the boundary between rays and the neighboring tissues is required.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45108395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of Anti-Asthmatic Activity of Essential Oils from the Lauraceae Family in Lipopolysaccharide (LPS)-Stimulated NCI-H292 Cells 樟科精油对脂多糖(LPS)刺激NCI-H292细胞抗哮喘活性的评价

Journal of the Korean wood science and technology Pub Date : 2022-11-01 DOI: 10.5658/wood.2022.50.6.414

Jiyoon Yang, Su-Yeon Lee, Hyunjeong Na, Soo-Kyeong Jang, M. Park

引用次数: 1

Mechanical Properties of Cork Composite Boards Reinforced with Metal, Glass Fiber, and Carbon Fiber 金属、玻璃纤维和碳纤维增强软木复合板的机械性能

Journal of the Korean wood science and technology Pub Date : 2022-11-01 DOI: 10.5658/wood.2022.50.6.427

Min-Seong Cha, So-Jeong Yoon, Jin-Ho Kwon, H. Byeon, Han-Min Park

{"title":"Mechanical Properties of Cork Composite Boards Reinforced with Metal,\u0000 Glass Fiber, and Carbon Fiber","authors":"Min-Seong Cha, So-Jeong Yoon, Jin-Ho Kwon, H. Byeon, Han-Min Park","doi":"10.5658/wood.2022.50.6.427","DOIUrl":"https://doi.org/10.5658/wood.2022.50.6.427","url":null,"abstract":"For effective applicability of reinforced cork, cork composites reinforced with metal, glass fiber, and carbon fiber were developed, and the effects of the reinforcing materials on the mechanical properties of cork composites were investigated. The bending moduli of elasticity (MOE) of cork composites were in the 32.7–35.9 MPa range, while the bending strength values were in the 1.62–1.73 MPa range. The strength performance decreased in the order cork-metal > cork-carbon fiber > cork-glass fiber. The bending MOEs were improved by 29%–41% compared with simple cork boards, while the bending strengths of reinforced cork were 35%–45% higher. The strength performance significantly improved following the incorporation of thin mesh materials into the middle layer of the studied cork composites. The bending strains of the cork composites were remarkably higher compared with oak wood, making them promising for applications that require bending processing, such as curved jointing. The internal bond strengths of the cork composites were 0.26–0.44 MPa, approximately 0.36–0.60 times lower compared with medium-density fiber boards.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47383224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Synchrotron X-Ray Diffraction Studies on Crystalline Domains in Urea–Formaldehyde Resins at Low Molar Ratio 低摩尔比脲醛树脂晶体结构的同步加速器x射线衍射研究

Journal of the Korean wood science and technology Pub Date : 2022-09-01 DOI: 10.5658/wood.2022.50.5.353

E. Wibowo, Byung‐Dae Park, V. Causin, Dongyup Hahn

{"title":"Synchrotron X-Ray Diffraction Studies on Crystalline Domains in\u0000 Urea–Formaldehyde Resins at Low Molar Ratio","authors":"E. Wibowo, Byung‐Dae Park, V. Causin, Dongyup Hahn","doi":"10.5658/wood.2022.50.5.353","DOIUrl":"https://doi.org/10.5658/wood.2022.50.5.353","url":null,"abstract":"The crystalline domain of thermosetting urea–formaldehyde (UF) resins at low formaldehyde-to-urea (F/U) molar ratios (≤ 1.0) is known to be responsible for their poor performance as wood adhesives. Crystallization has been observed in 1.0 F/U UF resins during the addition reaction stage and at the end of the synthesis process (neat UF resins). The crystallinity and X-ray diffraction (XRD) spectra of the uncured neat UF resins, on the other hand, differed significantly from those of the cured neat UF resins, raising the possibility that their crystal structures were also different. This study demonstrates for the first time that the crystalline domains in 1.0 F/U UF resins generated from uncured and cured samples are identical. Despite having a lower crystallinity value, the synchrotron XRD patterns of purified neat UF resins were equivalent to the XRD patterns of cured neat UF resins. Transmission electron microscope images of the cured UF resins showed that the crystals were lamellar structures. This finding suggests that the crystal at low molar ratio UF resins are isotropic polycrystals with random orientation.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48274000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Monitoring of Moisture and Dimensional Behaviors of Nail-Laminated Timber (NLT)-Concrete Slab Exposed to Outdoor Air 暴露在室外空气中的钉层合木材(NLT)-混凝土板的水分和尺寸特性监测

Journal of the Korean wood science and technology Pub Date : 2022-09-01 DOI: 10.5658/wood.2022.50.5.301

Sung-Wook Hwang, Hyunwoo Chung, Taekyeong Lee, Kyung-Sun Ahn, S. Pang, Jun-Sun Bang, H. Kwak, Jung-Kwon Oh, H. Yeo

{"title":"Monitoring of Moisture and Dimensional Behaviors of Nail-Laminated\u0000 Timber (NLT)-Concrete Slab Exposed to Outdoor Air","authors":"Sung-Wook Hwang, Hyunwoo Chung, Taekyeong Lee, Kyung-Sun Ahn, S. Pang, Jun-Sun Bang, H. Kwak, Jung-Kwon Oh, H. Yeo","doi":"10.5658/wood.2022.50.5.301","DOIUrl":"https://doi.org/10.5658/wood.2022.50.5.301","url":null,"abstract":"The moisture and dimensional behaviors of a nail-laminated timber (NLT)–concrete slab composed of an NLT–plywood composite and topping concrete are monitored for 385 days. The slab is developed for using as flexural elements such as floors. The humidity control of wood gently introduces significant fluctuations under the ambient relative humidity into the slab, and fluctuations in the relative humidity result in dimensional changes. The equilibrium moisture content of the slab increases from 6.7% to 15.3% during the monitoring period, resulting in a width (radial) strain of 0.58%. The length (longitudinal) strain is negligible, and the height (tangential) strain is excluded from the analysis because of abstruse signal patterns generated. Concrete pouring causes a permanent increase in the width of the NLT–plywood composite. However, the width deforms because the weight of the concrete mixture loosens the nail-laminated structure, not because of the significant amount of moisture in the mixture. The dimensional stabilization effect of the nail-laminated system is demonstrated as the composite strain is lower than the total strain of lumber and plywood, which are elements constituting the nail-laminated structure.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70827816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Investigation of Sound Absorption Ability of Hinoki Cypress (Chamaecyparis obtusa) Cubes 日本柏木(Chamaecyparis obtusa)立方体吸声性能的研究

Journal of the Korean wood science and technology Pub Date : 2022-09-01 DOI: 10.5658/wood.2022.50.5.365

E. Jang

引用次数: 5

Antioxidative and Circadian Rhythm Regulation Effect of Quercus gilva Extract 栎树提取物的抗氧化及昼夜节律调节作用

Journal of the Korean wood science and technology Pub Date : 2022-09-01 DOI: 10.5658/wood.2022.50.5.338

Jin-Sung Huh, Sora Lee, Dong-Soo Kim, M. Choi, Hyunmo Choi, Kyung-Ha Lee

{"title":"Antioxidative and Circadian Rhythm Regulation Effect of\u0000 Quercus gilva Extract","authors":"Jin-Sung Huh, Sora Lee, Dong-Soo Kim, M. Choi, Hyunmo Choi, Kyung-Ha Lee","doi":"10.5658/wood.2022.50.5.338","DOIUrl":"https://doi.org/10.5658/wood.2022.50.5.338","url":null,"abstract":"Herein, water and ethanol extracts were obtained from the leaves, branches, kernels, and pericarp of Quercus gilva and subsequently analyzed for antioxidant activity and circadian rhythm regulation effects. Candidate components that may affect circadian rhythm and antioxidant activity were investigated to discover potential functional materials. Antioxidant activity was analyzed via 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2’-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical scavenging activity assays, showing that the hot water extract exhibited higher activity than that of the ethanol extract. In particular, the branch extract showed high antioxidant activity. By measuring total contents of polyphenols, flavonoids, and tannins, the hot water branch extract showed the highest concentrations, highlighting their significant contribution to the antioxidant activity. Examination of the circadian rhythm regulation of each extract showed that the ethanol extract exhibited greater impacts on the circadian rhythm amplitude compared to the water extract. The branch ethanol extract induced circadian rhythm amplitude changes via clock gene Bmal1 expression regulation. Determination of 12 phenolic compound concentrations showed that the branch ethanol extract contained many phenolic compounds, including catechin. This suggests that these compounds affected circadian rhythm regulation. In conclusion, the hot water branch extract has potential as an natural antioxidant material, while the corresponding ethanol extract has potential as a functional material for regulating circadian rhythm.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44337918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Influence of Alkali and Silane Treatment on the Physico-Mechanical Properties of Grewia serrulata Fibres 碱处理和硅烷处理对细齿Grewia纤维物理力学性能的影响

Journal of the Korean wood science and technology Pub Date : 2022-09-01 DOI: 10.5658/wood.2022.50.5.325

Bhupesh Jain, R. Mallya, S. Nayak, Srinivas Shenoy Heckadka, S. Prabhu, G. Mahesha, G. Sancheti

引用次数: 3