• Journal of the Korean Wood Science and Technology
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• v.39 no.1
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• pp.33-40
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• 2011

In this study, we identified wood species used in manufacturing Streetcar No. 381 from Seoul Museum of History. This Streetcar No. 381 is an important cultural heritage as one of the 2 streetcars remained in Seoul. It is important to preserve this streetcar through restoration and to maintain without any damage or degradation. The information on species of wood members should be needed for its original restoration. Thus, 6 interior and 1 exterior wood members were sampled and identified microscopically. Among the 7 wood members identified, 2 were found to be douglas-fir ($Pseudotsuga$), 2 lauan ($Shorea$), 1 exotic hard pine of ponderosa group ($Pinus$), 1 larch ($Larix$), and 1 oak of cerris group ($Quercus$), respectively.

• 한국지구과학회:학술대회논문집
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• 2010.04a
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• pp.101-102
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• 2010

규화목은 목본식물의 2차목부가 화석화된 것으로 화석화 과정에서 여러 종류의 무기물이 세포를 치환하거나 세포의 내강 또는 간극에 침투하여 고화된 것이다. 이 과정에서 목재의 해부학적 구조가 잘 보존되는 경우가 많고 이를 통해 목재의 수종을 비교적 정확히 동정할 수 있을 뿐만 아니라 과거 환경에 대한 정보를 얻을 수 있다. 목재는 유관속 형성층에 의해 매년 새롭게 형성되어 축적되며 형성된 조직은 성장하는 당해 기후변화를 반영하게 된다. 따라서 화석목재를 통해 과거 기후조건을 복원할 수 있는 정보를 얻을 수 있는 경우도 많다). 본 연구는 포항 분지의 신제3기 마이오세 장기층군에서 채집한 규화목의 조직과 나이테 분석을 통해 고환경을 해석한 것이다. 장기층군에서 채집한 15개의 규화목 표본 중 나이테가 잘 나타나는 5개 표본에서 나이테를 분석하고 그중 조직이 잘 보존된 1개의 표본에 대해 목재해부학적 연구를 수행하였다. 나무가 성장함에 따라 나타나는 나이테의 폭은 환경적 요인 등으로 매년 일정하지 않다. 이런 인접연륜간의 연륜변동성을 알아보기 위해 연륜연대학(Dendrochronology)에서 널리 사용되는 평균민감도 측정 방법을 사용하였다. 평균민감도는 연륜변동이 어느 정도있느냐를 알아보는 것으로 인접한 연륜들 사이의 차이를 측정하여 인접연륜간 연륜변동성을 나타낸다. 평균민감도 값이 크면 연륜폭 변동이 크다는 것을 의미하며 나무가 자라는 당시 환경인자의 변화량이 컸다고 해석할 수 있다. 조직이 잘 보존된 1개의 표본은 목재해부학적 특징상 느릅나무과(Ulmaceae) 느릅나무속(Ulmus)으로 동정되었다. 또한 5개 표본의 나이테를 분석한 결과 평균민감도는 0.34~0.41 범위를 나타내며 전체 평균은 0.37의 값을 갖는 것으로 나타났다. 이것은 규화목 생성 당시 환경이 온대기후를 지시하며, 물 공급이 매년 계절적인 제한을 받았거나 다양한 변화가 있어 계절적으로 강수량 변화가 있었음을 지시한다.

• The Journal of the Convergence on Culture Technology
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• v.6 no.1
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• pp.463-469
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• 2020

People enjoy more leisure time these days as the government introduced the workweek last year and there is a growing interest on living healthy life. Amidst such change in society, trekking in forest has gained popularity along more people spending leisure time by walking for health. As a result, there are many scenic trails being built using wood deck. Usually certain parts of trails are built with wood deck where the path maybe too dangerous for walking or where nature needs to be protected. However wood material used for deck is easily prone to defects which can lead to safety issues. This study aims to understand the differences by materials used for wood deck and to investigate a link between different materials used and causes for defect occurrence. And further, the study aims to identify materials and construction methods for high workability and safety. The study was able to conclude that different materials used and different construction methods of applied for wood deck yield different results in terms of workability and defect occurrence.

• Journal of Conservation Science
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• v.36 no.6
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• pp.505-510
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• 2020

In this study, the anti-stain effect of the Traditional Myoung-oil, which has been reproduced through traditional method, the Clean Myoung-oil, which was developed in an eco-friendly method through scientific analysis of Traditional Myoung-oil, and the perilla oil, which is the raw material of Myoung-oil and is currently used as a finishing agent when repairing wooden cultural properties was evaluated. As a result of the evaluation, perilla oil showed almost no anti-stain effect, whereas both types of Myoung-oil showed high anti-stain effect. However, it was confirmed that the anti-stain effect was significantly reduced after 4 weeks of exposure to the strain when Myoung-oil was diluted with terpene oil, a natural solvent. Thus, it was considered that the amount of treatment in the wood affected the anti-stain effect of Myoung-oil. In other words, in constructing wooden buildings, Myoung-o il is more suitable as a finishing agent to suppress mold growth than perilla oil. And, in order to increase the applicability of Myoung-oil, it is suggested that additional research on the optimal treatment amount and treatment method that can inhibit mold growth inhibition in outdoor environments is necessary.

• Journal of the Korean Wood Science and Technology
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• v.40 no.6
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• pp.397-405
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• 2012

Installation of deck has been on the rise in Korea recently, but there is little of research on the safety of deck. One of the major factors affecting maneuverability of a pedestrian is frictional force between an outsole of shoe and a surface of the deck. The frictional force is influenced by many factors such as raw material variance of deck, surface convex shape of deck, outsole patterns of shoes, and moist condition of contact surface between deck and shoes. This study focused on evaluating the effect of these factors on the frictional force. Two kinds of deck, which were made of natural wood and wood plastic composite, were used in this study. The surface convex patterns of deck were classified to single nonslip (longitudinal groove processing) and double nonslip (longitudinal and transverse groove processing). Two kinds of shoe outsole patterns, W-shape and rectangle-shape, were used in the tests. Also, the friction tests were carried out at dried surface conditions and water-adsorbed surface condition.

• Journal of the Korean Wood Science and Technology
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• v.29 no.4
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• pp.33-39
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• 2001

Laboratory particleboards (PBs) were made with urea-formaldehyde (UF) resins at four press times and two resin application rates. Enclosed caul system was used for collecting the exhaust gases materials generated during the hot-pressing of PB. Exhaust gases materials generated inside the enclosed caul during the hot-pressing of PB were collected in a controlled air stream. Formaldehyde from the exhaust gases collected was determined per a chromotropic method of the National Institute of Occupational Safety and Health Method 3500. The test results showed that formaldehyde emissions during the hot-pressing of PB increased with increasing press time, UF resin mole ratio, and resin application rate.

• Journal of the Korean Wood Science and Technology
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• v.48 no.5
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• pp.710-721
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• 2020

This study used a building model made up of cement, brick, and wood to measure temperature and relative humidity for 3 days in a closed environment with a diameter of 900 mm, and performed a comparative analysis of the effect of types of building materials on the indoor temperature environment and heat transfer characteristics. The water installed inside the building model represented the person in the room and was used to assess how the environment effects the person. Wooden building model showed the lowest heat loss due to the higher thermal insulation properties than cement and brick buildings. The thermal comfort of each building model was calculated using temperature and relative humidity, and the wooden building model created a more pleasant environment than the cement and brick building models.

• Journal of the Korean Wood Science and Technology
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• v.43 no.6
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• pp.804-809
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• 2015

Since Korea is home to Reticulitermes speratus, a kind of subterranean termites that prefer dark and humid conditions, there have been increasing damages to wooden structures by termites. One noticeable attribute of Korean subterranean termites is that they prefer than Pinus densiflora, the major construction material for Korean traditional houses. And because wide varieties of termites are distributed all over the world, it is not so easy to choose appropriate control methods depending on specific areas. This necessitates careful applications of the following control methods depending on the kinds of termites: fumigation treatment, soil termiticide, preservatives and insect treatment, termite colony elimination system, chemical treatment, and other physical and biological treatment methods. The purpose of this study is to investigate the control effects of environmentally-friendly Alkaline copper quaternary (ACQ), Copper Azole (CuAZ) and Micronized copper quarter (MCQ) on the termites contributing to the damage of wooden structures. It was found in this study that wood with preservative treatment produced a significantly higher termicidal efficacy than untreated wood.

• Journal of the Korea institute for structural maintenance and inspection
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• v.19 no.2
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• pp.76-83
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• 2015

This paper aims at developing an environmentally friendly modular dome structure system with highly filled extrusion wood-plastic composite (WPC) member, and manufacturing a real-size specimen by modularizing members and nodes. The member used in the model is the WPC member with 70% wooden fiber contests, which is higher then previous WPC one. Its members and nodes are modularized by analyzing geometric characteristics of icosahedral-based geodetic dome. Applicapability of the 6ea prototype nodes and 3ea prototype members to the modular dome is examined with the results of the modulaization and the making process for the real-size specimen. Besides, from the analysis results, the lowest buckling mode is expected to be a nodal buckling on a node near the boundary.

• Conservation Science in Museum
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• v.2
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• pp.27-34
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• 2000

24 wooden objects excavated from Daho-ri were identified into 8 categories such as Quercus spp. (37.7%), Castanea crenata (8.3%), Prunus (8.3%), Ilex (4.1%), Alnus spp. (25%), Prunus spp. (4.1%), Zelkova serrata (4.1%) and Fraxinuse (8.3%). Physical properties of the above high water content, high contraction rate and significant density reduction. As for degradation pattern, observation with polarizing microscope showed significant decrease of double reflection phenomenon in most of the excavated objects excluding vessel compared to other kinds of objects, and observation with SEM showed remarkable degradation of organization structure including the 2nd cell wall of wood. Reagent can be easily penetrated and diffused into the objects with high degradation rate, so it's beneficial to treat them with polymers such as PEG#4000(MW:3,350), but in order to prevent contraction and change in shape, high concentration of Reagent is required in treatment to hold wood organization structure.