• 월간 기계설비
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• s.224
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• pp.64-72
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• 2009

바이오에너지는 여러 가지 신재생에너지 자원 중에서도 자원의 잠재량이 많고 비교적 경제적이며 선진국에서는 활발희 개발 보급되고 있음에 비해 국내에서는 개발이용이 상대적으로 미흡하다. 그러나 최근의 고유가 문제, 기후변화 협약 의무이행 문제, 심각한 농 임산, 축산, 음식물쓰레기, 슬러지 등의 유기성 폐기물 처리 문제 등으로 국내에서도 바이오에너지 보급의 중요성이 부각되고 있다. 바이오에너지기술은 유기성폐자원 분야, 목질계 바이오매스 분야, 수송용 분야로 구분되는 데 바이오에너지를 생산하기 위한 플랜트 건설이 필요하다. 설비건설업계가 앞으로 이 부분에 주목할 필요가 있다는 지적이다. 정부가 집단에너지 보급에 있어 바이오에너지 사용의 가능성에 대해 적극 검토하고 있는 등 앞으로 바이오 에너지의 활용이 증대될 것으로 기대되고 있다. 이번 호에서는 바이오에너지 중 가장 큰 부분을 차지하는 유기성페자원을 중심으로 바이오에너지의 기술 및 적용사례를 알아본다.

• Journal of the Korean Wood Science and Technology
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• v.16 no.2
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• pp.62-68
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• 1988

잣나무의 Diterpene resin acids의 함량을 조사하기 위하여 침엽(needle), 일차조직(cortex), 목질부(sylem)별로 수지를 채취하여 최근 유행하고 있는 capillary column을 사용하는 GC를 이용하여 정량분석을 하였다. 분석결과 7종의 resin acid가 밝혀졌으며, 그 중 lambertianic acid는 neelde에서 74~87%, cortex에서 42-57%, xylem에서 18-28%로 분석되었는데, 다른 Pinus류에서 보다 훨씬 많은 양이 함유되어 병리곤충 분야나 농약 분야에서 고찰할 만한 가치가 있다고 생각하며, 그 외 l-obrnyltrans-p-coumarate, isocupressic acid pinusolide 등도 분석 되었다.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.36 no.3
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• pp.1-8
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• 2004

It is very difficult to compare directly the research results of enzymatic process in pulp and paper industry because commercial enzymes have diversity in its property. The chemical and biological properties of commercial enzymes were Investigated to help comparison of various commercial enzymes each other. In most case, the solid content of liquid enzymes was about 20%. The higher protein content in enzyme product does not mean the higher enzyme activity. Enzymes for paper process should selected by basis of enzyme activity, not by price of enzyme products. The chemical composition of fiber was not so much change with enzyme treatment. The enzymatic hydrolysis of fiber might negligible in paper process.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.36 no.1
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• pp.30-36
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• 2004

Waste papers(MOW and ONP) were deinked with alkaline cellulolytic enzyme from Coprinus cinereus 2249. The effectiveness of alkaline enzyme on sticky contaminant removal and bleaching of recycling pulp was investigated. The conclusions obtained from the results are as follows. The brightness of deinked pulps MOW and ONP was most high in 0.4IU enzyme treatment. \circled2 The removal effect of sticky contaminant was enhanced with alkaline cellulolytic enzyme treatment. Bleaching with sodium hydrosulfite was most effective in one and two stage bleaching after enzyme treatment of mixed wastepaper of MOW and colored paper. \circled4 The brightness of alkaline enzyme deinked ONP was increased 20％ with $H_2O$$_2$ bleaching.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2008.04a
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• pp.272-275
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• 2008

공연장음향성능에 영향을 미치는 중요한 부자재중의 하나인 음향반사판의 면밀도 변화에 따른 흡음특성 변화를 조사하였다. 음향반사판은 목질계반사판으로 밀도 변화는 $11\;㎏/m^2{\sim}41k\;㎏/m^2$으로 총 3개의 시료를 대상으로 측정하였다. 저주파 대역에서의 흡음률을 측정하기 위하여 서브우퍼와 무지향성 스피커를 사용하였으며 측정결과 중고주파수 대역의 흡음률은 면밀도 변화에 따라 큰 차이가 없었으나 저주파수 대역의 흡음률을 면밀도 변화에 따라 차이가 있는 것으로 나타났다. 향후 음악 공연 공간내의 음향반사판의 면밀도 변화에 따른 실내 음향 특성 변화 및 설계지침에 대한 연구가 필요할 것으로 사료된다.

• Journal of Korea Foresty Energy
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• v.18 no.1
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• pp.17-24
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• 1999

This study was conducted to examine the change in the structure of the lignin during liquefaction of kraft pulp lignin in Pinus korainsis and lignin sulfonic acid. The lignin liquefied compounds were extracted with chloroform from aqueous, liquefied lignins. Through the examination by IR, H($^{13}$C) - NMR and GC-MS spectrometers, phenolic compounds such as diguaiacol, acetic acid phenyl ester, phenol, 1-phenyl ethanone were identified with many of unknown phenolic compounds.

• 한국가시화정보학회:학술대회논문집
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• 2003.11a
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• pp.83-86
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• 2003

Synchrotron X-ray micro imaging technique was employed to non-invasively monitor the water flow inside xylem vessels in a bamboo leaf. The phase contrast X-ray images clearly visualized plant anatomy and the rise of a water front inside the vessels. Consecutive X-ray images taken for 60 seconds revealed water rise kinetics against gravity in the xylem of a cut dry leaf taken from a bamboo tree. For the first time, traces of water rise, variation of contact angle between water and xylem wall as well as the internal structure of xylem were obtained. In xylem vessels, a repeating flow pattern has a typical flow velocity of $30.7{\mu}m/s$ and faster flow is established intermittently. It is concluded that the transmission type of X-ray micro imaging can be used as a powerful tool to investigate the ascent of sap in the xylem vessels at a resolution higher than that of MRI.

• Journal of the Korea Furniture Society
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• v.15 no.2
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• pp.1-17
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• 2004

This paper attempted to review measuring methods of formaldehyde emission from wood-based panel products. Methods included for the discussion were desiccator methods, extraction method, and various chamber methods. First, the procedures and testing conditions of 24-hour desiccator method was critically reviewed, and an improvement of this method was proposed to meet international standards. Two different small chamber methods ($20\ell$ and $1m^3$ chamber methods) were also compared in terms of their advantages and disadvantages. In addition, the regulation levels of formaldehyde emission of wood-based composite panels were compared for different countries. The selection of a reference method of measuring formaldehyde emission of wood panel products should consider the ease of conducting test and cost required. Results should be exchangeable for different methods.

• Journal of the Korea Furniture Society
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• v.24 no.3
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• pp.257-262
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• 2013

This study was carried out to investigate the susceptibility of wood-based composite panels exposed to mould and sap-stain fungi. Five wood deterioration fungi (three mould fungi, two sap stain fungi) were inoculated into two types of commercial wood-based composite panels (medium density fiberboard and particleboard), which have three class of formaldehyde emission. All wood-based composite panels were more or less susceptible to mould and sap stain fungi. The attacking mode of the fungi was highly dependent on formaldehyde emission. This study indicates that all wood-based composite panels, specially low formaldehyde emission class panels should be considered to prevent fungal deterioration when they are used for exterior and humid interior applications.

• Applied Microscopy
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• v.34 no.4
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• pp.271-276
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• 2004

The genus of Biscogniauxia, well known wood degrading fungi, is a member of the Xylariales, which has woody to carbonaceous, brown to dark brown stromata. Daldinia concentrica and Biscogniauxia sp. isolated from heavily decayed hardwood, are precisely described under light microscopic and scanning electron microscopic level. Daldinia concentrica will be the first ultrastructural description in Korea. The unidentified species collected, having small size of ascospores $11.4\;15.6{\times}9.6\;12.0{\mu}m$ with full germ slit, are taxono-mically compared with similar species found in Korea.