• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1996.11a
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• pp.97-101
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• 1996

산림부산물인 수피에 의한 카드뮴 이온의 선택적 흡착 현상을 이용하여 인공폐수로부터 카드뮴이온의 제거를 시도하였다. 카드뮴 이온 선택성이 우수한 소나무와 상수리 나무의 수피를 이용한 효율적인 연속식 대량 수처리 시스템의 개발을 위한 기초 실험으로 카드뮴 이온흡착 등온선을 조사하였고, batch stirred reactor, airlift reactor, packed bed column 등 여러 접촉시스템에서의 카드뮴 이온의 제거 효율을 검토하였다. 카드뮴 흡착등온선은 두 수피 모두 Langmuir 형식으로 나타났으며 소나무 수피의 최대흡착용량은 약 7 mg/g, 상수리나무 수피의 경우에는 약 8 mg/g 정도로 나타났다. Batch stirred reactor를 이용한 시스템에서 초기농도 13 ppm의 카드뮴용액 100 $m\ell$ 을 수피 10 g 과 접촉시킨 결과 30분 이내에 95% 이상 제거되는 효율성을 보여주었다. Airlift reactor를 이용한 시스템에서는 수피 30 g 을 포기농도 10 ppm 카드뮴 용액 1 liter와 접촉시킨 결과 15분 이내에 93 % 이상 제거되었으며 4 cycle 반복 운전에서도 거의 같은 성능을 유지하였고 그 이상의 cycle에서는 점점 성능이 떨어짐을 보여주었다. Packed bed column을 이용한 시스템에서는 20 g의 수피를 충전시켰을 경우 초기농도 20 ppm에서 effluent 2.5 liter 까지는 95% 정도의 제거효율을 보여주었다.

• Journal of Korean Society of Forest Science
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• v.102 no.2
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• pp.300-304
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• 2013

Pine wilt disease caused by pine wood nematode, Bursaphelenchus xylophilus (Steiner et Buhrer) Nickle, has become the most serious threat to pine trees in Korea since 1988. Pine wood nematode is transferred to healthy trees by Monochamus alternatus (Coleoptera: Cerambycidae) during its maturation feeding and female oviposition. A typical control method against insect vectors in Korea is fumigation of the dead trees by using metam-sodium SL (25%). However, this method is not environment friendly because of the forest contamination by chemical application and destroying landscape by plastic cover. Portable Bark Remover (PBR) was invented to reduce these environmental problems. The vectors oviposit under the bark of the newly dead trees only. Debarking infested trees prevents the vectors from laying eggs and eventually, they can not complete their life cycle. The PBR is a modified debarking device that is attached on the top of the electrical chain saw, which allows ease and rapid debarking of the infested trees. The new method by PBR is expected to be more economic and effective than other conventional methods such as "crushing", "burning" and "fumigation".

• Journal of Korea Foresty Energy
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• v.21 no.2
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• pp.1-9
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• 2002

Pine bark was carbonized by using a small-scale experimental kiln and three different types of large-scale kilns (simple (400-$500^{\circ}C$), improved (600-$700^{\circ}C$) and special kiln (800-$1,000^{\circ}C$). The physical properties and pore structures of the bark charcoals prepared were analyzed. When the bark was carbonized at various temperatures ranging from 500 to $900^{\circ}C$in the presence of nitrogen, carbonization yield decreased rapidly with increasing carbonization temperature and it remained constant from 700 to $900^{\circ}C$. The carbonization yield of the bark was 16 - 18% higher than that of pine wood. The BET specific surface areas and iodine values increased with a decrease in carbonization yield. The BET specific surface areas of the bark charcoals reached about 400 -$500m^2／g$ for carbonization yield of 32-40%. The pine wood charcoal prepared at $600^{\circ}C$ for 30 min resulted in a more microporous structure, whereas the bark charcoal prepared at the same condition was more mesoporous. The carbonization yields and physical properties such as iodine values and BET specific surface areas of bark charcoals prepared by using the large-scale kilns were very similar to those of the small-scale kiln. The results indicated that the pine bark could be used as starting material to produce good quality charcoal having a large specific surface area and a high carbonization yield.

• Journal of the Korean Wood Science and Technology
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• v.27 no.2
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• pp.46-52
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• 1999

Alkaline sulfite-anthraquinone(AQ) cooking was examined for their effectiveness in delignification of pine (Pinus densiflora S. et Z.) bark. Better delignification was achieved with alkaline sulfite liquor compared to monosulfite liquor, but the degree of delignification was less than 90% indicating need for improvement in cooking method, Remarkable increase in the rate of cooking and delignification was obtained by the simple addition of AQ to the alkaline sulfite cooking, Selectivity of delignification was also improved by the addition of AQ, Consequently, 90% of delignification was achieved with the addition of 0.2% AQ to the alkaline sulfite cooking. The selectivity of delignification was slightly affected by cooking temperature and NaOH concentration during alkaline sulfite-AQ cooking of the bark. The selectivity of delignification was highly affected by the concentration of $Na_2SO_3$, and the optimum concentration of $Na_2SO_3$ for the high delignification was 30% as $Na_2O$.

• Proceedings of the Materials Research Society of Korea Conference
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• 2003.03a
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• pp.63-63
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• 2003

플라즈마 공정은 DRAM, 이종접합 양극성 트랜지스터(HBTs), 레이저, 평면도파로(planar lightwave circuit)와 같은 전자소자 및 광조자 제작에 있어서 핵심 공정중의 하나이다. 최근 미세 구조의 크기가 극도로 감소하게 됨에 따라 실제 소작 제작에 있어서 미세한 모양을 식각하는 공정이 매우 중요하게 되었다. 그 중에서 고밀도 유도결합 플라즈마(high density inductively coupled plasma)를 이용한 기술은 빠르고 정확한 식각률, 우수한 식각 균일도와 높은 재현성 때문에 습식식각 기술보다 선호되고 있다. 본 연구는 평판형(planar) 고밀도 유도결합 플라즈마 식각장치를 이용하여 BCl$_3$와 BCl$_3$/Ar 플라즈마에 따른 AlGaAs/GaAs의 식각결과를 비교 분석하였다. 공정 변수는 ICP 소스(source power)파워, RIE 척(chuck) 파워, 공정 압력, 그리고 Ar 조성비(0-100%)이었다. BCl$_3$에 Ar을 첨가하게 되면 순수한 BCl$_3$ 플라즈마에서의 AlGaAs/GaAs 식각률(> 3000 $\AA$/min) 보다 분당 약 1000$\AA$ 이상 높은 식각률(>4000 $\AA$/min)을 나타내었다. 이 결과는 Ar 플라즈마의 이온보조(ion-assisted)가 식각률 증가에 기인한다고 예측된다. 그리고 전자주사 현미경(SEM)과 원자력간 현미경(AFM)을 사용하여 식각 후 표면 거칠기 및 수직 측벽도 둥을 분석하였다. 마지막으로 XPS를 이용하여 식각된 후에 표면에 남아 있는 잔류 성분 분석을 연구하였다. 본 결과를 종합하면 BCl$_3$에 기초한 평판형 유도결합 플라즈마는 AlGaAs/GaAs 구조의 식각시 많은 우수한 특성을 보여주었다.79$\ell/\textrm{cm}^3$, 0.016$\ell/\textrm{cm}^3$, 혼합재료 2는 0.045$\ell/\textrm{cm}^3$, 0.014$\ell/\textrm{cm}^3$, 혼합재료 3은 0.123$\ell/\textrm{cm}^3$, 0.017$\ell/\textrm{cm}^3$, 혼합재료 4는 0.055$\ell/\textrm{cm}^3$, 0.016$\ell/\textrm{cm}^3$, 혼합재료 5는 0.031$\ell/\textrm{cm}^3$, 0.015$\ell/\textrm{cm}^3$, 혼합재료 6은 0.111$\ell/\textrm{cm}^3$, 0.020$\ell/\textrm{cm}^3$로 나타났다. 3. 단일재료의 악취흡착성능 실험결과 암모니아는 코코넛, 소나무수피, 왕겨에서 흡착능력이 우수하게 나타났으며, 황화수소는 펄라이트, 왕겨, 소나무수피에서 다른 재료에 비하여 상대적으로 우수한 것으로 나타났으며, 혼합충진재는 암모니아의 경우 코코넛과 펄라이트의 비율이 70%:30%인 혼합재료 3번과 소나무수피와 펄라이트의 비율이 70%:30%인 혼합재료 6번에서 다른 혼합재료에 비하여 우수한 것으로 나타났으며, 황화수소의 경우 혼합재료에 따라 약간의 차이를 보였다. 4. 코코넛과 소나무수피의 경우 암모니아가스에 대한 흡착성능은 거의 비슷한 것으로 사료되며, 코코넛의 경우 전량을 수입에 의존하고 있다는 점에서 국내 조달이 용이하며, 구입 비용도 적게 소요되는 소나무수피를 사용하는 것이 경제적이라고 사료된다. 5. 마지막으로 악취제거 미생물균주를 접종한 소나무수피 70%와 펄라이트 30%의 혼합재료를 24시간동안 장기간 운전

• The Korean Journal of Mycology
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• v.24 no.2 s.77
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• pp.93-103
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• 1996

In order to find out effect on the inorganic and organic compounds as a soil amendment to control Fusarium wilt of cucumber caused by Fusarium oxysporum f. sp. cucumerinum, this study was conducted during the last two years from 1993 to 1995. According to add 14 inorganic chemicals (1%, w/v) including $Al_2(SO_4)_3$ individually in vitro, these chemicals were confirmed their suppression, and especially Alum, CaO and $Al_2(SO_4)_3$ suppressed not only $20.9{\sim}25.0$ percent on mycelial growth of the fungus, but also inhibited $72.8{\sim}97%$ on conidial germination. $Ca(NO_3)_2$ suppressed mycelial growth only, while KCl, $K_2SO_4,\;NH_4NO_3$, and Urea suppressed conidial germination. The 7 chemicals were finally seleced. Composted pine bark (CPB) suppressed definely more than 90% on conidial germination in the different extract concentration (2,5 and 10%), although mycelial growth on extract medium of CPB and milled alfalfa leaves (MAL) were not remarkable. The antagonist Trichoderma sp. (Tr-3) mixed with an amended soil (1%, w/w) containing composted pine bark showed a good mycelial growth to compete the causal fungus. And the antagonist Pseudomonas sp. (7-1-3) was also confirmed its antagonistic ability with culture filterate. It is known that a CPB soil amendment mixed with the two antagonists (1%, w/w) controlled almost completely Fusarium wilt of cucumber in greenhouse pots and a field experiment. It is therefore expected that biocontrol on Fusarium wilt of cucumber by a soil amendment can be applied to farmmer's fields.

• Journal of Korean Society of Environmental Engineers
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• v.29 no.8
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• pp.930-937
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• 2007

Korean pine(Pinus densiflora) bark was evaluated for its adsorption capacity of Cu(II) ions from aqueous solution by running a series of batch experiments. Prior to the tests, the milled barks were treated with 1 N NaOH or 1 N HCl to examine the effect of surface modification. For comparison, untreated bark was tested under same condition. Within the tested pH range between 3 and 6, NaOH treatment increased Cu(II) adsorption capacity by $139\sim184%$, while HCl treatment decreased it by $37\sim42%$. Maximum copper ion uptake by bark was observed at pH $5\sim6$, but pH of solution was not a potent influence. A pseudo second-order kinetic model fitted well for the sorption of copper ion onto bark. For NaOH-treated bark, the calculated sorption capacity$(q_e)$ increased from 6.58 to 12.77 mg/g, while the equilibrium rate constant$(k_2)$ decreased from 0.284 to 0.014 g/mg/min as initial Cu(II) concentration doubled from 100 mg/L. A batch isotherm test using NaOH-treated bark showed that equilibrium sorption data were represented by both the Langmuir model and the Freundlich model. It was confirmed that carboxylic acid of bark was involved in the Cu(II) adsorption. For NaOH-treated bark, in particular, carboxylate ion produced by hydrolysis or saponification appeared to be a major functional roup responsible for the enhanced Cu(II) sorption.

• Journal of Korean Society of Forest Science
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• v.71 no.1
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• pp.59-65
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• 1985

In this study, the vegetation of Pinus densiflora S. et Z., Pinus regida Miller, Pinus koraiensis S. et Z., and Larix kaempferi Satgent (major conifers) stands planted in the Chungcheong-province was investigated to obtain the fundamental informations for the improvement of coniferous barks utilization. The results may be summarized as follows; 1) Barks are much richer in quantity of extractives and lignin than the corresponding wood. Alcohol-benzene extractives of Pinus koraiensis barks are the highest among others. Pentosan contents are lower in the bark than in the wood, but pentosan contents of the Larix kaempferi bark is the highest among others. 2) Barks are acid in nature, and PH values of barks varying from 3.5 to 4.1 are lower than that of wood. The ash contents of barks are greater than the corresponding wood. 3) A bark comprises from 13.9 to 19.8 percents of a typical log by volume. The calorific values are higher in the barks than in the wood, and calorific values of Pinus koraiensis barks are the highest among others.

• Journal of Korea Foresty Energy
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• v.21 no.3
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• pp.18-27
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• 2002

Pine bark was liquefied in the presence of phenol using organic sulfonic acids as catalysts, and the liquefied barks were characterized. It was found that the organic sulfonic acids were more effective catalysts than hydrochloric acid for complete liquefaction of pine bark. The liquefied barks prepared from phenol-organic sulfonic acid liquefaction were highly phenolated, and the amounts of combined phenol were 2-3 times greater than that of the liquefied bark obtained from phenol-hydrochloric acid liquefaction. The glass transition points (Tg) were lower than that of the liquefied barks prepared from phenol-hydrochloric acid. It can be concluded that by using the organic sulfonic acids, the phenol used as a liquefying reagent is highly introduced into the bark, resulting in the phenolated bark preventing further condensation reactions, which may occur during the liquefaction. The carbohydrates such as cellulose and hemicellulose in the liquefied barks were almost decomposed during the liquefaction, from the results of IR spectra and neutral sugar analyses. Energy dispersive X-ray spectromery (EDS) results from the residues and the liquefied barks showed that the organic sulfonic acid catalysts did not lead to serious corrosion of the reactor compared with the hydrochloric acid catalyst.

• Journal of Korean Society of Forest Science
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• v.80 no.3
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• pp.279-286
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• 1991

This study was carried out to investigate relationships between atmospheric $SO_2$ concentration and both soluble sulphur contents in the tree leaves and bark pH to test the possibility of using them as bioindicators for air pollution. Mt. Kwanak, Mt. Nam, Mt. Bukhan (located in Seoul) and Mt. Paldal (located in Suwon, Kyonggi-do) as polluted areas and Pyongchang, Kwangwon-do as an unpolluted area were selected for this study. Soluble sulphur contents in the leaves and hark pH of two tree species (Pines densiflora S. et Z. and Quercus mongolica Fisch.) were analyzed in May, August, and October, 1990 by $BaSO_4$ precipitation method and pH measurement, respectively. In both species, concentration of soluble sulphur in the leaves increased with increasing concentration of atmospheric $SO_2$ (correlation coefficient : 0.52). Soluble sulphur contents in the 2-year-old needles of Pines densiflora (0.170%) and current year leaves of Quercus mongolica (0.081%) in Mt. Nam in the center of Seoul were higher than those in unpolluted Pyongchang area (0.023% and 0.034%, respectively). Bark pH decreased with increasing atmospheric $SO_2$ concentration (correlation coefficient : -0.52). Bark pH of P. densiflora (pH 3.42) and Q. mongolica (pH 3.63) in Mt. Nam were lower than those in Pyongchang area (pH 3.94 and pH 4.93, respectively). Both soluble S content in the leaves and bark pH were recognized as suitable bioindicators for air pollution by $SO_2$. Especially, bark pH showed more sensitive response to air pollution by $SO_2$ than soluble S concentration in the leaves. The lowest concentration of soluble sulphur and the highest bark pH in August were considered to be due to heavy rain during the rainy season. Soluble S content in the leaves and bark pH were not significantly different at 5% level between the two species in polluted areas.