• 한국산학기술학회논문지
• /
• 제16권10호
• /
• pp.6959-6968
• /
• 2015

이 연구는 기존의 목제품 수급모형(FOSMO2013)을 갱신하고, 제품별로 중장기적인 수요와 공급을 전망하는데 목적이 있다. 목제품 시장 수급모형은 주요 제품인 제재목, 합판, 파티클보드, 섬유판, 펄프 등으로 한정하였다. 각각의 제품에 대해 공급함수, 수입수요함수, 수요함수 등을 최신 자료를 이용하여 갱신하였다. 외생변수 가운데 하나인 세계 목재 및 목제품에 대한 가격 전망치는 Buongiorno 등(2012)의 연구결과를 적용하였다. Buongiorno의 연구는 기후변화에 관한 정부간 협의체(IPCC) 시나리오 3개(A1B, A2, B2)와 연료목재 수요에 대한 가정을 변경한 시나리오(A1B_LF)를 추가하여 전망결과를 발표하였는데, 본 연구의 전망치도 이와 같은 시나리오를 반영하여 2050년까지 총 4개의 시나리오에 따른 결과를 전망하였다. 전망 결과 국내 목재 및 목제품에 대한 장기 전망치는 시나리오와 제품별 차이는 있지만 대체적으로 생산은 감소하고 수입은 증가할 것으로 예상되었다.

• 한국공간구조학회:학술대회논문집
• /
• 한국공간구조학회 2008년도 춘계 학술발표회 논문집
• /
• pp.49-52
• /
• 2008

목재자원을 효율적으로 활용하기 위한 목적으로 개발된 공학목재는 기존에 구조용으로 사용되어 오던 목재제품에 비해 강도가 높으면서도 안정적인 장점을 가지고 있다. 또한 설계 상세에 따라 부재를 주문 제작이 가능하며, 대규모 건축물에도 주요 구조체로 사용되어져 오고 있다. 장 스팬이 요구되는 재료로 구조용 집성재나 목재 I형장선, 단판적층재(LVL) 등을 활용하여 사용되고 있다. 본 프로젝트는 공학목재 중에서 집성재 및 막재를 이용한 구조 시스템으로, 강원도 뿌리기념관 공원공사 중 "야외무대 지붕공사"로 구조 재료, 구조설계 및 시공에 관한 내용으로 구성되어 있다. 지붕 구조재는 PVF/PFLT(테드라 필름코팅) 소재의 막이 사용되었다. 기둥 및 경사 부재는 강재(SS400)를 사용하였고, 캔틸레버 보 부재는 비대칭 구성 집성재(10S-28B)를 이용하였다.

• Journal of the Korean Wood Science and Technology
• /
• 제46권4호
• /
• pp.346-354
• /
• 2018

Kemenyan resin from Styrax sumatrana is a unique non-timber forest product (NTFP) native from Sumatera Island, Indonesia. It possesses a wide range of applications in the pharmaceutical, perfume, and cosmetics industries. In this paper, six kemenyan resin samples were investigated to evaluate their free radical scavenging activity using 1,1-diphenyl-2-picrylhydrazyl (DPPH) reagent. The kemenyan resin samples, which originated from North Tapanuli, Pakpak Bharat, and Humbang Hasundutan, showed high antioxidant activity with $IC_{50}$ < 16 mg/L. The antioxidant activity of common kemenyan resin constituents, i.e., cinnamic acid, ethyl cinnamate, gallic acid, and vanillin was also investigated as positive control, although they exhibited lower antioxidant activity ($IC_{50}$ < 1000 mg/L), except for gallic acid ($IC_{50}$ = 5,23 mg/L). The total phenolic and flavonoid contents (TPC and TFC) for all samples were 44-66 mg gallic acid equivalents (GAE)/g sample and 143-160 mg quarcetin equivalents (QE)/g sample. The results revealed that kemenyan resin has high potency as an antioxidant and could be used as a natural antioxidant resource.

• Journal of the Korean Wood Science and Technology
• /
• 제44권4호
• /
• pp.494-504
• /
• 2016

Eucalyptus oils are widely used as spices, perfume industrial materials, food flavorings, and medicines. Several types of Eucalyptus oils also have insecticidal activity and as carminative. This study investigated the chemical composition, insecticidal (larvicidal and repellent) activity of E. urophylla oil against filarial mosquito Culex quinquefasciatus. E. urophylla oil was obtained from fresh leaves by water-steam distillation with oil yield 1.08%. E. urophylla oil in this study had no color (clear), has odor (typical eucalyptus), with specific gravity 0.941; refractive index 1.465; miscibility in 70% ethanol 1 : 3; and optical rotation (-) $5.83^{\circ}$. The major compounds of the oil were ${\alpha}$-pinene (11.73%), 1,8-cineole (49.86%), ${\beta}$-ocimene (6.25%), ${\gamma}$-terpinene (9.11%), and ${\alpha}$-terpinyl acetate (7.63%). The result showed the excellent insecticide activity against C. quinquefasciatus. The oil provided larvicidal activity with $LC_{50}$: 80.21 ppm and $LC_{90}$: 210.18 ppm, and repellent activity with $IC_{50}$: 0.82% and $IC_{90}$: 4.88%. The present study showed the effectiveness of E. urophylla as natural insecticide against C. quinquefasciatus, the mosquito vector of filariasis.

• Journal of the Korean Wood Science and Technology
• /
• 제51권5호
• /
• pp.358-380
• /
• 2023

The intestinal microbiota plays a crucial role in determining human health, rendering it a major focus of scientific investigation. Rather than eliminating all microbes, promoting the proliferation of beneficial microorganisms within the gut has been recognized as a more effective approach to improving health. Unfavorable conditions potentially alter gut microbial populations, including a reduction in microbial diversity. However, intentionally enhancing the abundance of beneficial gut microbes can restore a state of optimal health. Polysaccharides are widely acknowledged for their potential to improve the gut microbiota. This review emphasizes the findings of recent studies examining the effects of forest product-derived polysaccharides on enhancing the gut microbiota and alleviating inflammation, diabetes symptoms, and obesity. The findings of several studies reviewed in this paper strongly suggest that forest products serve as an excellent dietary source for improving the gut microbiota and potentially offer valuable dietary interventions for chronic health problems, such as inflammation, diabetes, and obesity.

• Journal of the Korean Wood Science and Technology
• /
• 제44권6호
• /
• pp.903-912
• /
• 2016

Morphological and anatomical evaluation of grafted P. merkusii have been undertaken to obtain the information about compatible and incompatible symptoms of 18 years old grafts based on morphological observation and microscopic analysis. Samples of compatible and incompatible grafts were obtained from previous research conducted by the Silviculture Departement Team in 1994. Result showed that compatible grafts have normal stem form and secondary growth (diameter growth), but some abnormality symptoms like undulated pattern of annual growth rings, phloem thickening and abnormality resin ducts in inner and middle parts of the union area occurred. Incompatible ones showed abnormality of the stem form, cortex-bark necrosis and swelling in the union area. Microscopic observation showed abnormality of all parts of the union, undulated pattern of annual growth rings, phloem thickening, abnormal resin ducts, low numbers and discontinuity of vascular elements in the union area.

• Journal of the Korean Wood Science and Technology
• /
• 제51권2호
• /
• pp.81-97
• /
• 2023

The aim of this study were to evaluate tannin resorcinol formaldehyde (TRF) for the preparation of cross-laminated timbers (CLTs) made from fast-growing tree species and to analyze the physical and mechanical properties of CLTs. TRF copolymer resin was prepared by using the bark extracts of Swietenia mahagoni (L.) Jacq. It was observed that the TRF adhesive possessed less solid content (23.59%), high viscosity (11.35 poise), and high pH values (10.0) compared to the standard phenol resorcinol formaldehyde. The TRF adhesive was applied to produce CLTs with the addition of 15% tapioca and flour as an extender. The six-layered CLTs were produced from sengon (Falcataria moluccana Miq.), jabon [Anthocephalus cadamba (Roxb) Miq.], coconut (Cocos nucifera L.), and the combination of coconut-jabon and coconut-sengon wood. The analysis of variance revealed that the layer composition of CLT significantly affected the physical and mechanical properties of the beam. While the modulus of rupture met the standard, the moisture content and modulus of elasticity values did not fulfill JAS 1152-2007. All of the CLTs produced in this study demonstrated low formaldehyde emission, ranging from 0.001 mg/L to 0.003 mg/L, thereby satisfying the JAS 1152 for structural glue laminated timber.

• 펄프종이기술
• /
• 제39권3호
• /
• pp.36-40
• /
• 2007

It has been problematic to repulp the dry broke treated with permanent wet strength agents like PAE, UF and MF. Solution type GPAM has the benefit of easy repulping but it has problems of cocross-linking and tends to gel. Therefore, the product concentration must be lower than 10% to reduce the gel generation problem. We developed emulsion type GPAM by an inverse emulsion technology to resolve both the repulping problem with permanent wet strength agents and the stability problem of GPAM solution products.

• 한국화재소방학회논문지
• /
• 제32권3호
• /
• pp.1-7
• /
• 2018

본 연구는 ABC 분말소화약제와 제1인산암모늄의 열분해생성물이 목재표면에 미치는 영향에 대해 검토하였다. 목재표면에서 열분해 생성물을 제거하였을 때 제1인산암모늄은 점도가 높은 투명한 열분해 생성물이 눌어붙어 제거하기 힘들었으나 ABC 분말소화약제는 덩어리진 형태로 쉽게 제거되었다. 열분석 결과 각 시료의 열분해 특성은 유사하나 열분해 잔존물의 중량이 ABC 분말소화약제는 55.9%, 제1인산암모늄은 25.2%로 나타나 차이를 보였다. ABC 분말소화약제에 첨가된 첨가제가 열분해 잔존물의 중량 및 메타인산의 방신효과에도 영향을 미치는 것으로 나타났다.

• Journal of Biosystems Engineering
• /
• 제28권5호
• /
• pp.389-394
• /
• 2003

The concerns of wood vinegar increase with its various applications to food additive, functional drink, and in the sustainable farming. Chaff vinegar, a by-product of chaff charcoal which is produced by distilling smoke and having similar ingredients and efficacy with wood vinegar, contains harmful tar in the acceptable range and can be mass-produced. A chaff vinegar distiller, commercially mass-productive, was developed using a water cooling system. Initially distilled vinegar by the developed system contained little harmful tar in the acceptable range for the agricultural use and its acidity was about pH 3.2. Treatment of the chaff vinegar in the enhancing emergence test showed greater number of emerged seedlings, and vise-versa. Treatment of diluted in 100-holds showed 44.0% of emerged and 8.6% of not-emerged seedlings.