• 보존과학회지
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• 제36권6호
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• pp.505-510
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• 2020

본 연구에서는 전통적인 방법으로 재현한 전통 명유, 전통 명유를 과학적으로 분석하여 친환경적인 방법으로 개발한 크린 명유, 그리고 명유의 원료이자 현재 목조문화재를 보수할 때 단청의 마감제로 사용되고 있는 생들기름의 방미효력을 평가하였다. 평가 결과, 생들기름은 방미효력이 거의 없는 것으로 나타난 반면에, 두 종류의 명유는 모두 높은 성능의 방미효력을 보였다. 하지만, 명유를 천연용제인 테르펜유에 희석하여 사용하면 균주에 노출된 지 4주 만에 방미효력이 현저히 감소하는 것을 확인 할 수 있었다. 목재에 처리된 약제의 함량이 명유의 방미효력에 영향을 주는 것으로 판단된다. 즉, 목조건축물을 축조함에 있어서 명유가 들기름보다 곰팡이 발생을 억제하기 위한 마감제로 더 적합하며, 야외 환경에서의 곰팡이 성장 억제를 저해 할 수 있는 최적의 처리량 및 처리 방법에 대한 추가 연구를 통하여 명유의 적용 가능성을 높힐 수 있을 것으로 생각한다.

• 한국산림과학회지
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• 제96권4호
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• pp.432-437
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• 2007

본 논문의 목적은 강원내륙산간권역인 춘천시, 원주시, 홍천군, 횡성군, 평창군, 철원군, 화천군, 양구군, 인제군 총 9개 시군을 대상으로 지역별로 다양성을 추구하며 차별화할 수 있는 단기소득임산물을 선정하는 것이다. 생산액의 규모가 비교적 큰 송이버섯, 생표고, 밤, 잣, 도토리, 수지, 산양삼, 고사리, 도라지, 더덕, 두릅, 취나물, 수액, 목초액 등 14개 임산물을 분석대상으로 하였다. 분석방법으로는 지역별 품목 비중과 품목별 지역의 비중, 산업연관분석에서 사용되는 입지계수를 응용하여 만들어진 임산물계수를 이용하였다. 분석 결과, 춘천시에서는 밤, 원주시와 평창군에서는 생표고, 홍천군에서는 잣이 선정되었다. 횡성군과 화천군에서는 더덕, 철원군에서는 도토리가 선정되었다. 양구군에서는 취나물, 인제군에서는 수액이 선정되었다.

• Journal of the Korean Wood Science and Technology
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• 제51권5호
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• pp.419-430
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• 2023

In this study, the floor impact sound insulation performance of Korean domestic Cross-Laminated Timber (CLT) slabs was evaluated according to their joint types, species and thicknesses in laboratory experiments. The sound insulation performance of the CLT has not been investigated before, thus, this study was conducted to quantify basic data on floor impact sound insulation performance of CLT slabs. 5-ply and 150 mm thick CLT panels made of 2 species, Larix kaempferi and Pinus densiflora, were used for the study. The CLT panels were assembled by 3 types of inter-panel joints to form floor slabs: spline, butt and half-lap. And the 150 mm thick Larix CLT slabs were stacked to the thicknesses of 300 mm and 450 mm. The heavy-weight floor impact sound insulation performance of the 150 mm CLT slabs were evaluated to be 70 dB for the Larix slabs and 71.6 dB for the Pinus slabs, and the light-weight floor impact sound insulation performance, 78.3 dB and 79.6 dB, respectively. No significant difference in the sound insulation performance was found between the slabs of the 2 species or among the 3 types of joints. The reduction of 1 dB in the heavy-weight floor impact sound and 1.6 dB in the light-weight floor impact sound per 30 mm increase in thickness were confirmed through the experiments. This study can be viewed as the basic research for the evaluation of floor impact sound insulation performance of CLT.

• Steel and Composite Structures
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• 제50권6호
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• pp.689-703
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• 2024

Construction of high-rise structures, formwork systems that can be installed quickly, resistant to external loads, can be used more than once, have become a necessity. Timber and composite timber materials are preferred in the formation of such formwork systems due to their durability, ease of assembly, light weight and easy to use more than one time. Formwork beams are the most commonly used structural component in the formation of such formwork systems, and these beams can be damaged for different reasons during their lifetime. In this study, H20 top P type timber formwork beams with 1800 and 2450 mm length which is among the products of DOKA(c) company is damaged under the effect of static loading up to a high load level of 85% of the maximum ultimate capacity and after being retrofitted using anchored CFRP strips, performance and behavior of the beams under the influence of various loading types such as static, fatigue and impact are investigated experimentally. Two different lengths of retrofitted timber formwork beams were tested by applying monotonic static, fatigue and impact loading and comments were made about the effects of the retrofit method on performance under different loading types.

• Journal of Forest and Environmental Science
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• 제39권3호
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• pp.155-166
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• 2023

Consumption and selling of Non Timber Forest Products (NTFPs) are important means to meet nutritional requirements and improve the socio-economic conditions of the rural population. The purpose of this study was to document the status and utilization pattern and assess the economic value of NTFPs sold in the markets of the Itanagar Capital Region (ICR) of Arunachal Pradesh. Five major markets with 182 vendors were surveyed, and a total of 94 plant-based products under 63 species belonging to 32 families were found to be sold in the markets. Species like Acmella oleracea, Clerodendrum glandulosum, Dioscorea alata, Houttuynia cordata, Phoebe goalparensis, Piper pedicellatum, Zanthoxylum rhetsa, etc. are found to be highly preferred and have a higher demand in the local markets. The edible products of species like Piper pedicellatum and Phoebe goalparensis though highly consumed in the study area, are used only within the region, and the national and international demands of the species are nil. The animal-base products are not included in the study.

• Journal of the Korean Wood Science and Technology
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• 제34권5호
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• pp.19-28
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• 2006

There has been considerable research in recent times in light-timber med structures in fires. These structures have included horizontal (floor-like) panels in bending and walls under eccentric and approximately concentric vertical loading. It has been shown that compression properties are the most dominant mechanical properties in affecting structural response of these structures in fire. Compression properties have been obtained by various means as functions of one variable only, temperature. It has always been expected that compression properties would be significantly affected by moisture and stress, as well. However, these variables have been largely ignored to simplify the complex problem of predicting the response of light-timber framed structures in fire. Full-scale experiments on both the panels and walls have demonstrated the high level of significance of moisture and stress for a limited range of conditions. Described in this paper is an overview of these conditions and experiments undertaken to obtain compression properties as a functions of moisture, stress and temperature. The experiments limited temperatures to $20{\sim}100^{\circ}C$. At higher temperatures moisture vaporizes and moisture and stress are less significant. Described also is a creep model for wood at high temperatures.

• 한국산림과학회지
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• 제98권3호
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• pp.231-241
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• 2009

한-EU FTA 체결에 따른 수입 시장의 품목별 경쟁력을 분석하기 위하여 무역특화지수, 수입시장점유율과 단가지수, MCA지수 등을 이용하였다. 그 결과 단기소득임산물 가운데에는 크게 우려할 만한 품목이 없을 것으로 예상된다. 그러나 목재류의 경우 활엽수합판, 성형판(침엽수류), 고밀도화목재, 목모와 목분, 합판(기타), 파티클보드(기타), 기타섬유판, 배향성스트랜드보드(기타), 파티클보드(전체기타), 파티클보드(기타 미가공목재), 조립식 건축물(목재의 것), 목질재기타섬유판(밀도 0.5~0.8), 목제의 그림틀 사진틀, 기목세공과 상감세공 등의 품목은 FTA 체결에 따라 수입이 증가할 것으로 예상된다. 한국 수출품의 경우 단기소득임산물은 모두 시장 경쟁력이 없는 것으로 나타났으며, 목재류의 경우에도 목초액만 MCA 지수 및 TSI 지수에서 경쟁력이 있는 것으로 나타났으나, 그나마 수출이 지속적으로 발생하는 것이 아니라 경쟁력을 판단할 수준이 못된다고 할 수 있다.

• Journal of the Korean Wood Science and Technology
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• 제43권5호
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• pp.682-690
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• 2015

The bonding performance of two types of wood adhesives, namely phenol-resorcinol-formaldehyde (PRF) resin and melamine-urea-formaldehyde (MUF) resin for glued laminated timber manufactured by high frequency (HF) heating was evaluated. The HF heating system consists of HF oscillator with dielectric heating system for curing adhesives, and hydraulic press system for clamping glued laminated timber. The designed frequency and output power of the HF system was as 5 MHz and 60 kW, respectively. To verify dielectric heating mechanism under HF oscillation, the heat loss factors of laminae and adhesives were measured. The results show that it is possible to selectively heat adhesives for their curing due to the remarkably higher loss factor of the adhesives than those of wood laminae. The temperature of adhesive in the bonding line reached up to the set temperature within a few seconds by high frequency oscillating, which advanced the curing of adhesive afterwards. The bonding performance, such as shear strength of bonding line, water soaking delamination, and boiling water soaking delamination of PRF resin met the requirement of Korean Standard (KS), however the MUF resin did not meet the KS requirement of boiling water soaking delamination. These results indicate that the HF heating system is successful to manufacture glued laminated timbers with PRF resins to meet the bonding requirements.

• 대한건축학회논문집:계획계
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• 제34권8호
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• pp.129-136
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• 2018

Termites are important sub-baits of natural ecosystems and are beneficial insects that are natural decomposer. However, the building materials used by human beings can not coexist with each other on timber which is a termite food. As of 2017, due to fertile forests, warming, and the spread of boilers, termite damage to timber construction is increasingly occurring day by day. Currently, Korea utilizes fumigation, Beit system, preserved wood, etc. of chemical products as termite control measures. But in the case of control measures, timber that has already been eaten by termites can not serve as a structural material and must be repaired. On the other hand, in the case of overseas, Scale of damage to termites the influence on the construction is also large, and a lot of research has been carried out on the prevention methods. In this thesis, investigate such foreign control measures, Would like to suggest a suitable method for Korea.

• 한국가구학회지
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• 제23권4호
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• pp.460-466
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• 2012

This study was conducted to investigate the surface hardness of thermally-compressed larch wood by compression set and temperature. The surface hardness of thermally-compressed larch wood increased with increasing compression set and temperature. For compression set 60%, the specific gravity was increased as 0.93. However, the surface hardness was lower value as 31.1 N/$mm^2$ compared with a similar specific gravity of the tropical timber. For density profile, less than compression set 40%, compression was observed mainly surface area. On the other hand, more than 50%, density profile variation was reduced by compression of central part. Results of this study indicate that thermally-compressed larch wood can be replace some imported hardwoods such as oak or cherry. However, thermally-compressed larch wood was difficult to replace the tropical timber being imported in terms of surface hardness.