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권구중,권성민,김남훈 한국목재공학회 2003 목재공학 Vol.31 No.4
본 연구에서는 국내산 소경재의 보다 효율적인 이용을 위하여 PEG처리한 활엽수재의 환공재 4수종(신갈나무, 굴참나무, 물푸레나무, 오동나무)과 산공재 4수종(산벚나무, 물박달나무, 층층나무, 은사시나무)에 대한 치수안정성을 평가하였다. 수축률은 공시수종 모두 PEG처리에 의해 감소하는 효과가 있었고, 산공재가 환공재보다 낮았다. 중량증가율은 PEG농도의 증가에 따라 증가되었고, 산공재가 환공재보다 다소 높은 증가율을 보여주었다. 벌킹효과는 PEG농도의 증가에 따라 증가하였지만, 분자량이 클수록 감소하였고, 산공재가 환공재보다 벌킹효과가 높게 나타났다. 결론적으로, 산공재가 환공재보다 높은 치수안정성을 보여주었다. 따라서 PEG처리재의 치수안정효과는 목재의 구조(도관의 분포상태 및 타이로시스 존재유무)와 밀도에 크게 영향받는 것으로 생각되었다. This study was carried out to investigate the dimensional stability of wood treated with PEG for better utilization of domestic small-diameter logs. Four species of ring-porous wood(Quercus mongolica F_(ISCH), Quercus variabilis B-(LUME), Fraxinus rbynchopbhlla H_(ANCE), Paulownia coreana U_(YEKI),) and fore species of diffuse-porous wood(Prunus sargentii R-(EHDER), Betjal davurica P_(ALL), Populus tomentiglandulosa T. L_(EE), cornus controversa H_(EMSLEY)) were used for this experiment. The shrinkage of wood decreased with increasing the concentration of PEG. The shrinkage of diffuse- porous woods was lower than that of ring-porous woods. The weight gain increased in proportional to the PEG concentration. Diffuse-porous woods showed a little higher weight gain than ring-porous woods. Bulking effect also increased with increasing the PEG concentration, but was in inverse proportional to the molecular weight of PEG. Diffuse-porous woods showed higher bulking effect than ring-porous woods. Consequently, diffuse-porous woods showed better dimensional stability than ring porous woods. It was considered that dimensional stability was affected by characteristics of wood such as vessel and tylosis, and density.
권구중,이수영,황재현,Kwon, Goo-Jung,Lee, Su-Young,Hwang, Jae-Hyun 한국유기농업학회 2014 韓國有機農業學會誌 Vol.22 No.4
This research estimates the necessity of a better governance plan on the purpose of fulfillment energy recovery by building resource recycling system for biomass resources and waste resources that derive from agricultural and mountain village areas. The utilization of new renewable energy technology which uses waste and biomass sources diverse as variety of resources, collecting method, operator etc. and is structurally complicated the formation of policy is also very difficult. There is failure because of the problems which occurs from the policy led by government. Biomass Town Development Project should be made through the central government and the local government integrated support system and should be formed a consultative group in order to process the project mutually with these two department including the experts from the related areas. This consultative group, while government organizations carry out the hub function of strategic knowledge management, should carry out the control tower function to be able to be net working transfer the information with the cooperation of private and government so vitalize the communication area among the related actors. And to be able to increase the participation rate of the local people the consistent and various educations should be given so a smooth business promotion progress will be desired through the change of perception and coactive participation of people.
염화콜린/요소와 염화콜린/글리세린 전처리로 제조한 셀룰로오스나노섬유 특성
권구중,박찬우,한송이,박지수,이은아,( Azelia Wulan Cindradewi ),김남훈,이승환 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
본 연구는 Sodium chloride와 acetic acid에 의한 탈리그닌 처리(SA처리)와 처리하지 않은 소나무재를 이용하여 염화콜린/요소(ChCl/U)와 염화콜린/글리세린(ChCl/GLY)를 1:2의 몰비로 혼합한 공융용매로 전처리하고 고압 Homogenizer를 이용하여 제조한 셀룰로오스 나노섬유(CNF)의 특성을 검토하였다. 여수 도는 고압균질기 반복횟수가 증가할수록 증가하였다. TEM관찰에 의해 SA처리한 CNF는 10nm이하의 폭을 가진 나노섬유 비율이 높았지만, SA미처리 CNF의 폭은 다양하였다. 또한 ChCl/U 전처리가 ChCl/GLY 전처리에 비해 나노섬유들이 다소 균일하였다. 결정화도는 SA처리 CNF가 고압균질기 반복횟수 증가와 함께 감소하였지만, SA미처리 CNF는 반복횟수에 따른 특징적인 차이는 없었다. CNF현탁액으로 제조한 필름의 인장강도는 고압균질기 반복횟수 증가에 따라 증가하였으며, SA처리재를 ChCl/U 용매로 처리한 조건이 가장 높았다.
권구중,김대영,김은지,강주현 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.4
This study investigated adsorption characteristics of lead on bead-type holocellulose aerogels synthesized from wood fiber by using an alkali hydroxide - urea solution. The synthesized holocellulose aerogels were classified into two groups for comparison according to the source of the precursor hydrogel, a dissolved upper layer and a precipitated bottom layer of hydrogel solution, formed during the synthesis procedure. As the equilibrium concentration of lead in the solution was increased, the amount of lead adsorbed on the holocellulose aerogel increased, eventually reaching a maximum. As the pH was increased, the adsorption capacity of lead also increased. The adsorption rate rapidly increased during the earlier 10 min period and then asymptotically approached equilibrium. However, as the lead concentration in the water was increased, the time required for achieving equilibrium also increased due probably to the dynamic exchange of lead molecules during the adsorption process. The lead adsorbed to the aerogels was visually identified by using Scanning electron microscopy (SEM) and electron dispersive spectroscopy (EDS) analyses. This study suggests that the holocellulose aerogel can be potentially used in many water treatment applications targeting heavy - metal, including lead, removal.
권구중,김남훈 강원대학교 산림과학연구소 2009 Journal of Forest Science Vol.25 No.2
Recently, various efforts for the extended utilization of woody biomass has been attempted due to the fact that global warming, energy and environmental problems are urgent ones to be solved. Development of new energy sources at our national security level is desperately needed as we depend on almost all of energies supplied from other countries, let alone the economic crisis caused by oil price hike. Woody biomass can be converted to energy by means of thermochemical, biological, or direct combustion processes. Many processes are available for producing bioenergy, such as bioethanol, wood pellet, wood chip, combined heat, and power system. Political support and R&D investment should be provided that can boost the utilization of the wood biomass, the eco-environment, and recyclable and alternative energy resources for national power security. In addition, a long-term strategy that can utilize unused and low efficient woody biomass resources, and systematically collect and manage them in a national level should be set up. Even though the possibility in total exchange of fossil oil with woody biomass is quite low, technology developments of woody biomass for the solution to global warming and environmental problem through its commercialization are expected to grow steadily.
권구중,김대영,강규영 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10
Pretreatment of cellulose at below 300 ℃ prior to the carbonization at 1200 ℃ was studied for the production of high-yield biocarbons. Filter paper as the cellulosic raw material was pyrolyzed by heating schemes including 16-h isothermal step at 215-270 ℃ under nitrogen atmosphere, followed by fast heating up to 600 ℃ and finally to 1200 ℃. Cellulose degradation was completed in the 16-h holding isothermal step at above 250 ℃, and it was confirmed by the analyses of IR spectroscopy and X-ray diffraction. The yield of char was increased from 11% to 21% by pretreatment of cellulose after post-treatment at 600 ℃ or 1200 ℃. The BET surface area as the microporosity value was also significantly enhanced from 461 m<SUP>2</SUP>/g to 837 m<SUP>2</SUP>/g by straight heating of 10 ℃/min. It is considered that these results caused by slow heating and stabilizing effects by pretreatment of cellulose at the critical temperature for degradation.