• 펄프종이기술
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• 제46권6호
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• pp.1-7
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• 2014

Dissolving part of xylan and lignin in lignocellulosic biomass by base can be used as pretreatment technique. Cork oak was pretreated with sodium hydroxide solution and the pretreatment effects were evaluated with two critical factors - NaOH concentration and pretreatment temperature. Some of xylan and lignin were removed by base pretreatment. At $90^{\circ}C$ and 13% NaOH pretreatment, 22.0% of lignin and 78.8% of xylan removed by base treatment. Enzymatic hydrolysis of cork oak which was pretreated at higher temperature or concentration was further improved. After pretreatment of cork oak with 13% NaOH at $90^{\circ}C$, the conversion rate of cellulose to fermentable sugars were reached up to 91.3%. At ethanol fermentation with enzymatic hydrolysate from different pretreatment conditions, all enzymatic saccharification liquids were well fermented by Saccharomyces cerevisiae.

• Nuclear Engineering and Technology
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• 제53권3호
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• pp.920-926
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• 2021

Capsules containing NaCl-MgCl₂ salt with 316L stainless steel or alloy N samples were irradiated in the Ohio State University Research Reactor for 21 nonconsecutive hours. A custom irradiation vessel was designed for this purpose, and details on its design and construction are given. Stainless steel samples that were irradiated during exposure had less corrosive attack than samples exposed to the same conditions without irradiation. Alloy N samples showed no significant effect of irradiation. This work shows a method for conducting in-reactor irradiation-corrosion experiments in static molten salts and presents preliminary data showing that neutron irradiation may decelerate corrosion of alloys in molten chloride salts.

• 한국균학회지
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• 제51권2호
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• pp.121-125
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• 2023

In this study, we examined the ectomycorrhiza (ECM) formed by a species of the genus Tuber, T. koreanum, with two indigenous Korean oak species, Quercus acutissima and Q. dentata. T. koreanum showed a high colonization rate for both oak species, with a higher mean colonization rate observed for Q. acutissima. The mycorrhizal characteristics of T. koreanum were described, revealing distinct morphological and anatomical differences between the ECM formed with the two host plants. This study is significant because it is the first to elucidate ECM formations of T. koreanum in indigenous oak trees. However, further studies are required to differentiate the ECM associations formed by T. koreanum from those of other Tuber species.

• 대한자원환경지질학회:학술대회논문집
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• 대한자원환경지질학회 1999년도 춘계 공동학술발표회
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• pp.4-4
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• 1999

• 대한자원환경지질학회:학술대회논문집
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• 대한자원환경지질학회 1999년도 춘계 공동학술발표회
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• pp.335-335
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• 1999

• 대한자원환경지질학회:학술대회논문집
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• 대한자원환경지질학회 1999년도 춘계 공동학술발표회
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• pp.336-336
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• 1999

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2002년도 추계학술발표회요약집
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• pp.79-79
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• 2002

• The Korean Journal of Ecology
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• 제17권3호
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• pp.345-353
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• 1994

상수리나무림과 리기다소나무에서 낙엽 생산과 분해를 조사하였다. 낙엽 생산량은 litter trap을, 낙엽의 분해는 litterbag를 이용하여 정량적으로 조사하였다. 낙엽의 생산은 연중 계속 되었지만 가을에 최대치를 보였으며, 5월과 6월에는 생식기관이나 눈을 싸고 있던 비늘에 의해 두 번째의 peak가 나타났다. 연간 낙엽 생산량은 상수리나무림과 리가다소나무림에서 각각 567.1g/m2과 653.2g/m2이었다. 본 조사지역의 낙엽 생산량은 다른 지역의 결과에 비해 많았다. 낙엽의 영양염류 함량은 상수리나무가 리기다소나무에 비해 높았고, 칼슘을 제외하고 낙엽생산량이 최대인 가을에 그 값이 낮았다. 1년이 지난 후 낙엽의 잔존률은 상수리나무와 리기다소나무가 각각 43.6%, 58%이었고, 21개월 후에는 그 값이 각각 22.2%와 33.2% 이었다.

• 한국산림과학회지
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• 제106권3호
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• pp.362-369
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• 2017

본 연구는 참나무시들음병 발생지역의 지형적, 공간적 발생분포에 대한 조사와 분석을 통하여 피해 예상지에 대한 적극적인 방제를 위한 기초 자료를 제공하고자 수행되었다. 참나무시들음병 피해는 경기도 파주시 광탄면 3개 지역에서 2011년부터 2015년까지 발생된 피해목을 모두 조사하여 분석하였다. 그 결과 참나무시들음병은 능선에 가까울수록 많은 수의 피해목이 발생되었으며, 보다 효과적인 방제를 위하여 능선을 기준으로 0~40 m까지 중점관리지역으로 선정하여 집중적인 방제작업이 필요할 것으로 사료된다. 또한 경사에 따른 피해상황이 지역에 따라 다르게 나타났으므로 피해발생을 경사도로 예측하기는 어려울 것으로 판단된다. 경급별로는 지역마다 본수비율이 가장 높은 평균 경급에서 피해목의 수가 가장 많은 것으로 분석되었다.

• Journal of Biosystems Engineering
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• 제26권2호
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• pp.147-154
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• 2001

In Korea and Japan, dried oak mushrooms are classified into 12 to 16 different categories based on its external visual quality. And grading used to be done manually by the human expert and is limited to the randomly sampled oak mushrooms. Visual features of dried oak mushrooms dominate its quality and are distributed over both sides of the gill and the cap. The 2nd prototype computer vision based automatic grading and sorting system for dried oak mushrooms was developed based on the 1st prototype. Sorting function was improved and overall system for grading was simplified to one stage grading instead of two stage grading by inspecting both front and back sides of mushrooms. Neuro-net based side(gill or cap) recognition algorithm of the fed mushroom was adopted. Grading was performed with both images of gill and cap using neural network. A real time simultaneous discharge algorithm, which is good for objects randomly fed individually and for multi-objects located along a series of discharge buckets, was developed and implemented to the controller and the performance was verified. Two hundreds samples chosen from 10 samples per 20 grade categories were used to verify the performance of each unit such as feeding, reversing, grading, and discharging unites. Test results showed that success rates of one-line feeding, reversing, grading, and discharging functions were 93%, 95%, 94%, and 99% respectively. The developed prototype revealed successful performance such as the approximate sorting capability of 3,600 mushrooms/hr per each line i.e. average 1sec/mushroom. Considering processing time of approximate 0.2 sec for grading, it was desired to reduce time to reverse a mushroom to acquire the reversed surface image.