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이동흡(Dong-Hub Lee),오형민(Hyung-Min Oh),강창호(Chang-Ho Kang),손동원(Dong-Won Son),김종인(Jong-In Kim) 한국산림바이오에너지학회 2002 산림바이오에너지 Vol.21 No.2
천연물계의 유지를 목재에 처리하여 발수성능을 평가하였다. 시험에 사용한 유지는 아마인유, 피마자유, 올리브유, 콩기름, 들기름, 해바라기씨기름이다. 발수성 평가는 흡습성, 흡수성 시험과 접촉각 시험으로 하였다. 발수 처리한 목재를 빛과 수분에 의해 촉진열화 시킨 후에 열화정도를 색차계로 측정하였다. 촉진열화된 처리목재의 발수성능을 흡수성 시험과 접촉각 시험을 통하여 비교 측정하였다. <br/> 흡습성 시험결과, 흡습 초기에는 무처리에 비하여 흡습량이 적으나 흡습처리 시간이 증가할수록 무처리의 흡습량에 가까워져 48시간 흡습처리 후에는 흡습비의 큰 차이는 없었다. 접촉각 시험의 결과, 처리재와 무처리재간의 결과가 큰 차이를 나타내었다. 유지의 농도와 종류에 따른 접촉각변화는 흡습성 시험과 같이 큰 차이는 나타나지 않았다. 천연유지의 발수성능으로는 기상열화에 대한 안정성이 낮았다. 천연오일 단독처리만으로는 광열화에 대한 안정성을 기대하기 어려웠다.<br/> This research was carried out to investigate water repellent effectiveness of natural oil treated wood. Linseed oil, castor oil, olive oil, bean oil, perilla oil and sunflower oil were used in this test.<br/> For evaluation of water repellent of natural oil treated wood, moisture absorption test, water-drop contact angle test and color difference test of accelerated decomposition by UV and water were used. <br/> The moisture absorption amount of natural oil treated wood was less than untreated wood until 3 hours, but it was increased with time, there was no big difference with oil treated wood and untreated wood after 48hours.<br/> Oil treated wood and untreated wood showed big difference on contact angle test. It was no big difference by kind and oil concentration. Natural oil treated wood did not showed stability on the weather aging test. Contact angle test could be used on evaluation of wood surface status treated with natural oil. <br/>
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황순미(Soonmi Hwang),오형민(Hyung-Min Oh),남수용(Soo-Yong Nam),강태순(Tae-Soon Kang) 한국연안방재학회 2021 한국연안방재학회지 Vol.8 No.4
In the vicinity of the coast, there is a risk of complex disasters in which inland flooding, wave overtopping, storm surge, and tsunami occur simultaneously. In order to prepare for such complex disasters, it is necessary to set priorities for disaster preparedness through risk assessment and establish countermeasures. In this study, risk assessment is carried out targeting on Marine city, Centum city, and Millak waterside parks in Busan, where complex disasters have occurred or are likely to occur. For risk assessment, inundation prediction map constructed by the Ministry of Public Administration and Security in consideration of sea level rise, rainfall and storm surge scenarios and authorized data on social and economic risk factors were collected. The socioeconomic risk factors selected are population, basements, buildings, sidewalks, and roads, and the risk criteria for damage targets are set for each risk factors. And it was assessed considering the maximum inundation depth and maximum flow velocity of the inundation prediction map. Weights for each factor were derived through expert questionnaires. The risk assessment index that was finally evaluated by calculating the risk index for each element and applying weights was expressed as a risk map by different colors into four levels of attention, caution, alert and danger.
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라디에타소나무 단판적층재의 밀도,접착,강도성능 및 내부후성
서진석 ( Jin Suk Suh ),이동흡 ( Dong Heub Lee ),황원중 ( Won Joung Hwang ),오형민 ( Hyung Min Oh ),박영란 ( Young Ran Park ),강승모 ( Sung Mo Kang ) 한국목재공학회 2011 목재공학 Vol.39 No.4
라디에타소나무 단판적층재(LVL)를 제조함에 있어서, CuAz 및 ACQ 방부처리와 비처리, 수성비닐우레탄 접착제와 페놀변성 리조시놀수지 접착제의 상온경화형 접착제를 적용함에 따른 밀도경사, 접착·강도성능 및 내부후성(방부효력)을 살펴보았다. 결과, LVL의 밀도경사에서 접착층 주변이 원추형으로 밀도가 커지는 경사패턴을 보였다. 접착성은 수성비닐우레탄 접착의 경우, 자비반복시험 후 전층이 박리되거나, 일부 층이 박리하고 할렬·틈새 현상이 일어났다. 페놀변성 리조시놀수지 접착제 접착의 경우, 자비반복시험 후 접착층의 응력이 큰데 연유한 굽음과 상하 접착층 사이의 단판의 수직할렬 현상이 있었으나, 접착층의 박리나 할렬이 거의 발견되지 않아 침지박리접착력은 높은 것으로 판단되었다. 한편, 방부효력시험에 있어서, 수성비닐우레탄 접착제로 적층한 LVL의 경우 갈색부후균에 의한 부후도가 백색부후균보다 크게 나타났다. 페놀변성 리조시놀수지 접착제로 LVL을 제조한 경우에는 갈색부후균에 의한 질량감소가 적었고, 약제를 처리하지 않더라도 그 피해가 낮았으며, 약제처리한 것은 질량감소율 0 수준을 보일 정도로 방부효력이 큰 것을 알 수 있었다. In this study, LVLs of radiata pine were fabricated with non-preservative treated veneers, CuAz treated veneers, and ACQ treated veneers, using aqueous vinyl urethane adhesive and phenol modified resorcinol resin adhesive. Then density gradient, bonding strength, bending properties and decay resistance of LVLs were evaluated. As results, the cone-shaped and higher density gradient pattern was found in layer close to glueline. After cyclic water boiled test, the LVL bonded with aqueous vinyl urethane resin adhesive was delaminated in all layers or partly delaminated including check, chasm in glueline layer. In the case of LVL bonded with phenol modified resorcinol resin adhesive, despite slight cupping due to great glueline stress and vertical check between glueline layers, it was observed that the bonding strength to delamination was higher, owing to most absence of delamination through overall glueline. On the other hand, in the decay test, mass loss by brown rot fungi was greater than white rot fungi in LVL bonded with aqueous vinyl urethane resin adhesive However, in LVL bonded with phenol modified resorcinol resin adhesive, the mass loss by brown rot fungi was slight and non-preservative treated LVL was low. The mass loss of preservative-treated LVL was 0 (zero), showing the high decay resistance effect.
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이동흡,이명재,오형민,손동원 한국목재공학회 2004 목재공학 Vol.32 No.2
본 실험은 건조되지 않은 목재를 고온의 아마인유에 침지처리함으로써 목재건조와 동시에 발수효과를 얻고자 실시하였다. 함수율 90% 이상의 소나무생재를 온도 150℃의 아마인유에서 6시간 침지처리하였을 때 목재함수율은 10%까지 떨어졌으며, 목재 축방향의 깊이에 관계없이 목재단면의 20%에 해당하는 아마인유가 침투하였다. 이때 목재의 강도적 손실은 발생하지 않은 것으로 나타났다. 목재표면의 천공처리는 목재의 내부할열방지에 효과적이었고, 아마인유의 깊은 침투를 유도할 수 있었다. 흡수성 시험 결과 처리재는 무처리재에 비하여 높은 발수효과를 나타냈다. 변색균 및 부후균에 대한 항균효력시험은 처리재 자체로서 균에 대한 독성 기작이 없었으나, 백색부후균 및 갈색부후균에 대해서는 무처리재보다 낮은 중량감소율을 나타내는 등 방부효력의 상승이 있었다. This study attempted to evaluate the water repellency and drying effectiveness of linseed oil treated-solid wood at high temperature by immersion. The moisture content of green wood (Pinus densiflora) sample (above 90%) was reduced about 10% after 6 hours treatment at 150℃. When the treated samples were cut into cross section along the length, it was observed that the linseed oil penetrated into up to 20% of the sample cross section area in all locations. However, a strength loss of the specimen was not detected. The pre-drilling before linseed oil treatment was effective in reducing the defects such as checks and splits, and improved the linseed oil penetration into all samples from the surfaces. The result of water absorption test of treated-wood showed that the water repellent efficacy of treated-wood was greater than that of the control. The anti-fungal activity of treated samples using five sap stains and thee decay fung was not detected in broad-spectrum toxic mechanism. However, decay test using white rot fungi(Tyromyces palustris) and brown rot fungi(Trametes versicolor) showed that the treated sample has a decay resistance to thew two fungi.
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