멜라민수지 함침지 적층에 의한 소나무재의 표면 강화

한규성,Han, Gyu-Seong 한국가구학회 2006 한국가구학회지 Vol.17 No.1

Because the surface of pine wood is very soft, there have been many attempts, like as surface coating, resin impregnation, and densificationt, to harden the surface of wood for its interior use. This study was carried out for surface hardening of pine wood by laminating of melamine resin sheet. The effect of laminating method on the characteristics of melamine resin sheet-laminated wood(MLW) was investigated. Flat-sawn softwoods were suitable for MLW making. And the pre-drying of wood at $105^{\circ}C$ for 30min, before laminating, was effective for preparing of defect-free MLW. The abrasion resistance of pine wood was greatly improved by laminating of melamine resin sheet on its surface. Consequently, the laminating of melamine resin sheet was proved to be a favorable method for improvement of surface abrasiveness of pine wood.

농업부산물인 산업용 대마(Cannabis sativa L.) 목부를 이용한 고밀화 펠릿 연료

한규성,이수민,신수정,Han, Gyu-Seong,Lee, Soo-Min,Shin, Soo-Jeong 한국자원식물학회 2009 한국자원식물학회지 Vol.22 No.4

종자 수확 후 버려지는 산업용 대마를 이용한 목질 펠릿제조 가능성과 제조된 펠릿의 특성을 살펴보았다. 산업용 대마의 성분 분석 결과 활엽수와 비슷한 리그닌 함량과 당구성을 보였으며, 회분 분석 결과 무기물 함량이 0.5% 정도이어서 연료로 사용할 경우 재의 생산량은 크지 않을 것이다. 원소 분석 결과 대기 오염을 유발할 수 있는 질소와 황 함량을 분석한 결과, 황 성분은 전혀 포함하지 않고 있으며, 약간의 질소 성분을 포함하고 있는데 이는 현사시나무와 비슷한 수준이었다. 고위발열량 측정 결과 대마 목부는 현사시나무보다 다소 낮은 값을 나타내었다. 바이오매스 생산량이 큰 대마 목부를 이용하여 제조한 펠릿은 활엽수로 제조한 펠릿과 비슷한 화학적 성질과 발열 특성을 가질 것으로 기대되어 고체연료로서의 이용이 가능할 것으로 사료되었다. We prepared densified wood pellet by agricultural waste. The hemp woody core was used as replacing wood resource. Hemp was separated into the bast fiber and the woody core by hot steaming treatment. The hemp woody core had a similar lignin content(19.4%) and carbohydrate composition with hardwood(20-25% lignin in hardwood), respectively. Also, the hemp had a low ash content(0.5%), which resulted in a low ash formation in pellet burning. Heating value of the hemp pellet(18.40 MJ/kg) had a very similar to the pellet made by hardwoods. The hemp woody core could be replaced the hardwood for densified wood pellet.

2050 탄소중립 사회 실현을 위한 목재산업의 역할

한규성 ( Gyu-seong Han ) 한국목재공학회 2021 한국목재공학회 학술발표논문집 Vol.2021 No.1

최근 2050 탄소중립이 미래사회를 위한 거대담론의 중심이 되고 있다. 산림, 임업 및 목재산업 분야에서도 2050 탄소중립을 위해 어떤 역할과 노력을 해야 할 지에 대해 깊은 고민과 성찰이 필요한 시기이다. 그런데 우리나라의 산림산업과 목재산업은 ‘착한 산림탄소순환체계’를 지켜 나가기가 점점 어려워지고 있다. 장기화되고 있는 코로나19 사태와 건설경기 침체 등 다양한 외부적 요인으로 인해 국내 목재산업에 불황의 그림자가 점차 짙어지고 있기도 하다. 실제 국산 목재수요의 감소로 입목벌채량이 2018년 546만2000㎥에서 2019년 518만4000㎥로 약 5.1% 감소해 산림산업과 목재산업 모두 힘든 시기를 마주하고 있다. 지금은 그 어느 때보다 산림자원을 적기에 벌채하여 자원으로 활용해야 하고, 그 자리에 다시 나무를 심어 산림의 탄소흡수기능이 더 잘 유지하도록 하는 ‘착한 산림탄소순환체계’ 구축이 시급한 시기임에 틀림없다. 다시 말해 기후문제를 극복하고 탄소중립사회를 구현하기 위해서는 더 적극적인 신규조림, 재조림, 산림갱신, 목재제품(재료와 에너지로) 이용이라는 순환체계를 구축하여야 하는 것이다. 이를 통해 산림의 탄소 흡수 기능을 개선하며, 더불어 산림이 건강하게 조성되도록 하고, 궁극적으로는 산불예방, 산사태 방지 등 국민안전을 위협하는 재해에도 대비할 수 있기 때문이다.

대장직장암에서 수술 전 생검 조직의 범내피세포와 림프관 표지자 발현의 의의

한규성(Gue Sung Han),김범규(Beom Gyu Kim),차성재(Seong Jae Cha),장인택(In Taek Chang),이태진(Tae Jin Lee) 대한외과학회 2007 Annals of Surgical Treatment and Research(ASRT) Vol.73 No.2

Purpose: Panendothelial markers such as factor Ⅷ, CD34, CD31, CD105 (endoglin) and D2-40 are useful to identify proliferating endothelium that is related to tumor invasion. This study was designed to identify the correlation between the expressions of panendothelial and lymphatic vessel markers in preoperative biopsy specimens and the clinicopathologic factors. Methods: Preoperative biopsy specimens from 72 patients were immunostained for CD105, CD34, CD31, Factor Ⅷ and D2-40. The microvessel and lympathic vessel densities (MVD and LVD) were counted in dense vascular foci (hot spots) on a ×200 field in each specimen. The correlation between these factors and the clinicopathologic parameters were analyzed. Results: The MVD by CD105 showed statistically significant correlation with tumor emboli, the T-stage, nodal metastasis and the stage, and the MVD by CD34 had statistically significant correlation with tumor emboli, nodal metastasis and the stage. The lympathic vessel density (LVD) by D2-40 showed a statistically significant correlation with tumor emboli, the T-stage and nodal metastasis. Conclusion: The MVD by CD105 and the LVD by D2-40 in preoperative biopsy specimens of colorectal cancers may be useful markers for the prediction of invasiveness.

아세틸화 활엽수재의 치수변화 특성

한규성(Gyu Seong Han) 한국가구학회 2000 한국가구학회지 Vol.11 No.2

It is well-known fact that dimensional stability of wood is greatly enhanced by acetylation of<br/> wood. This dimensional stability results from bulking of the reacted acetate within the cell wall, which reduces further swelling when the modified woods come into contact with water or water vapor. The purpose of this research was to determine the water absorption and dimensional stability of the acetylated solid wood in liquid water and in humidity tests. Beech and red oak were acetylated. Moisture and water absorption of acetylated wood were quite dependent on weight percent gain(WPG). Antiswelling efficiency(ASE) was quite dependent on WPG, but was not dependent on species.<br/> Keywords: acetylation, dimensional stability, hardwood, ASE<br/>

수증기 처리에 의한 열압밀화목재의 압축 고정 ( Fixation of Compression Set of Heat-Compressed Wood by Steaming )

한규성(Gyu Seong Han),이원희(Weon Hee Lee) 한국가구학회 2000 한국가구학회지 Vol.11 No.2

This study investigated the effect of steaming on fixation of compression set and the effect of these treatments on mechanical properties of heat-compressed wood specimens. To determine the effect of steaming after compression set, wood specimens were compressed for 100min at 180"C and then steamed for 20-100min at 120"C. Swelling tests were used to evaluate recovery of compression set. Bending, compression, and Brinell hardness tests were carried out for evaluating mechanical properties. Compressed wood steamed for 100 min at 120"C showed 1.9% recovery of set, increases in bending and compressive properties, and no hardness change. We concluded that almost complete fixation of compression set in wood can be achieved by steaming compressed wood.<br/> Keywords: heat-compressed wood, fixation of compression set, steaming<br/>

발수제 처리 소나무재의 치수안정성

한규성(Gyu-Seong Han) 한국가구학회 2008 한국가구학회지 Vol.19 No.3

The objective of this study was to investigate the influence of the water repellents' treatment on the water absorptivity and the dimensional stability of Korean red pine wood(Pinus densiflora). The alkylketene dirner(AKD), fluororesin emulsion(Wood-seal, WS), and paraffin wax emulsions(PW25, PW40, and PW1200) were used as water repellents. PW40 and WS were proved as excellent water repellents for pine wood, because the samples treated with these agents showed high contact angles and large reduction in water absorptivities. Also, the dimensional stability(antiswelling efficiency) of pine wood was considerably improved by water repellents treatments, such as PW40 and WS at the pressure of 2MPa. The water repellent treated woods with WS, PW40, and PW1200 at the pressure of 2MPa were relatively stable to the wet-dry cyclic leaching test.

목재-ABS수지 복합체의 물성에 미치는 상용화제의 효과

한규성(Gyu Seong Han) 한국가구학회 1993 한국가구학회지 Vol.4 No.1

Composites of acrylonitrile-butadiene-styrene copolymer(ABS) with woody fibers were prepared. and the effect of compatibilizers on their mechanical properties was evaluated. To improve the compatibility of wood fibers and the matrix polymers. six kinds of compatibilizers were developed. The tensile strength and the elastic modulus of wood-ABS composite increased with the increases in the wood content. however. the break elongation of that decreased. On the tensile strength of wood-ABS composite, the chemically-reactive compatibilizer was effective. On the other hand. the compatibilizer. a methyl acrylate added styrene-acrylonitrile copolymer, was effective on the break elongation of wood-ABS composite

용액화목질로부터 페놀계 접착제의 제조

한규성(Gyu Seong Han),조남석(Nam Seok Cho) 한국가구학회 1996 한국가구학회지 Vol.7 No.1

Formaldehyde-type adhesive was prepared from liquefied wood. The effects of the liquefaction and resinification conditions on the adhesive properties were investigated. The Liquefaction of wood catalyzed with 5% of phenol sulfonic acid at 150˚c for 30 minutes can be considered as a very appropnate condition for the preparation of adhesive. And the resinification of liquefied wood at 90˚c for 30 minutes was good for the preparation of adhesive. The adhesive strength(tensile shear strength after cyclic boil test) of the resinified liquefied(phenolated) wood met Korean Standard of commercial phenol-formaldehyde adhesive for plywood(KS M3702). However, the the storage life at 60 t and th ε viscosity of prepared adhesive were below standard.<br/> Key words: resinification, liquefaction, phenol, adhesive, tensile shear strength<br/>

목질계 바이오매스 에너지화 목재펠릿 산업의 동향과 전망

한규성 ( Gyu Seong Han ) 한국공업화학회 2012 공업화학전망 Vol.15 No.6

우리나라에서는 2008년 말부터 상업적인 목재펠릿 생산이 시작되어, 주택용 펠릿보일러 및 난로, 농업용 펠릿온풍기 및 펠릿보일러, 산업용 펠릿보일러에서의 사용이 점차 확대되고 있으며, 최근에는 발전소의 연료로 사용되기에 이르렀다. 2011년에 약 45천 톤의 목재펠릿이 소비되었을 것으로 추산되며, 2012년에는 현재의 추세대로라면 약 140천 톤이 소비될 것으로 전망된다. 그리고 2013년에는 무려 350천 톤의 펠릿이 소비될 것으로 전망된다. 지속적인 성장을 위해서는 정부 정책에만 의지하지 않고 업계 스스로 자립할 수 있는 기반이 조성되어야 하는데, 다행히도 열공급 분야에서 목재펠릿의 경제성이 확보되어 있는 실정이다. 따라서 안전하면서 고효율의 연소기기가 뒷받침이 된다면 목재펠릿 시장은 지속가능한 연료시장으로 성장해 나갈 수 있을 것이다.