• 한국버섯학회지
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• 제20권2호
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• pp.61-68
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• 2022

전라북도농업기술원이 육성한 꽃송이버섯 '너울'의 표준 생육배지 구명을 위해 톱밥과 첨가물의 종류, 배합비를 달리하여 재배특성과 수량을 조사하였다. 톱밥 종류에서는 낙엽송 처리가 재배일수 97일로 가장 짧았으며 수량 역시 143.6 g으로 우수함에 따라 꽃송이버섯 재배에 적합한 수종으로 판단된다. 첨가물 선발시험에서는 수량이 밀기울 처리에서 116.6 g으로 가장 많았고, 수율 역시 밀기울 처리에서 53.1%로 가장 높음에 따라 꽃송이버섯 생산에 적합한 첨가물로 밀기울이 적합하다고 판단된다. 낙엽송 톱밥:비트펄프:밀기울을 이용한 배합비 조성에 따른 시험 결과, 수량은 80:15:5와 85:10:5 처리에서 각각 114.4 g, 111.4 g이었고, 수율은 85:10:5 처리에서 52.5%, 80:15:5 처리에서 51.8%였으나 수량과 수율에서 두 처리간의 통계상 유의성이 없었다. 따라서 꽃송이버섯 생산에 적합한 표준 생육배지로는 낙엽송 톱밥:비트펄프:밀기울을 이용한 80:15:5 또는 85:10:5 배합비가 유리한 것으로 판단되며, 이를 통해 꽃송이버섯 재배에 적합한 C/N율은 184~223 수준임을 추측할 수 있었다. 또한, 배지의 C/N율이 105 이하일 때는 발이가 어려움에 따라 꽃송이버섯 재배에 있어서 배지 pH 외에 배지의 C/N율 역시 발이에 중요한 요인이라는 것을 알 수 있었다.

• 한국환경생태학회:학술대회논문집
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• 한국환경생태학회 2011년 학술대회 논문집 2호
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• pp.122-126
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• 2010

• Journal of the Korean Wood Science and Technology
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• 제49권1호
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• pp.93-102
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• 2021

In this article, withdrawal resistances of axially loaded self-tapping screws on wood products made by Korean Larch were predicted with existing estimation equation, and compared with experimental test data. The research was required because no design methodology for the withdrawal resistance of self-tapping screw is present in Korean building code (KBC). First, the withdrawal resistance of wood screw was predicted to use the withdrawal design value estimation equation in National Design Specification for Wood Construction (NDS). Second, three types of wood products, solid wood, cross-laminated timber (CLT) and plywood, were utilized for withdrawal test. For decades, various engineered wood products have been developed, especially cross-laminated timber (CLT) and hybrid timber composites such as timber composites of solid wood and plywood. Therefore, CLT and plywood were also investigated in this study as well as solid wood. Finally, the predicted values were compared with experimentally tested values. As the results, the tested values of solid wood and CLT were higher than the predicted values. In contrast, it is inaccurate to predict withdrawal resistance of plywood since prediction was higher than tested values.

• Journal of the Korean Wood Science and Technology
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• 제31권6호
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• pp.55-59
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• 2003

The fixation and leaching characteristics of chromated copper arsenate (CCA Type C) and chromium- copper-fluoride-zinc (CCFZ) in domestic softwood (Japanese red pine, Korean pine, and Japanese larch) sapwood were investigated using the expressate method to follow chromium fixation and the American Wood-Preservers' Association (AWPA) leaching procedure to determine leaching properties after fixation. The rates of fixation were affected by preservative types; CCA was fixed much faster than CCFZ for all species evaluated. There were definite differences in the fixation rates of different species, with Korean pine requiring shorter to fix than the other species evaluated. Chromium fixation was greatly enhanced by elevated temperatures, and fixation time can be estimated according to fixation temperatures applied. The percentage of arsenic and zinc leached from domestic softwoods was relatively high compared to chromium and copper, indicating that there is still a relatively high unfixed arsenic and zinc components after complete chromium fixation in CCA-and CCFZ-treated samples, respectively.

• Journal of the Korean Wood Science and Technology
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• 제38권2호
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• pp.94-100
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• 2010

This study was performed to develop an LRFD (Load Resistance Factored Design) Code for Domestic Larch. To accomplish his, we evaluated bending, compression, tension and shear strength. The results of the strength evaluation were utilized to verify the distribution and code conversion. For bending, tension and compressive strength, the Weibull distribution was well-fitted, but for shear strength we observed a normal distribution. For evaluating the bending and compressive strength, a full-sized specimen was used. A small clear specimen was used to test tension and shear strength. Compressive strength in particular was found to be affected by tight knots, although there was little difference between grades. In the code conversion, the design value of the LRFD was larger than the existing allowable stress value in the Korean Building Code. However, the allowable stress in this study was about two times higher than the value listed in the Korean Building Code. This result induced the difference between the soft and hard conversions. For greater reliability, the accumulation of additional data is necessary and further studies should be performed

• 한국지리정보학회지
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• 제24권3호
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• pp.1-9
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• 2021

본 연구에서는 드론으로 취득한 고해상도 정사영상 자료를 이용하여, 컨볼루션 신경망(Convolution Neural Network, CNN)을 이용한 딥러닝 기법을 통해 수종에 대한 자동분류 가능성을 분석해 보고자 하였다. 수종판독을 위한 분류항목을 소나무, 자작나무, 낙엽송, 잣나무 그리고 신갈나무 5개 수종으로 선정하였다. 고해상도 정사영상과 임상도를 이용하여 총 5,000개의 데이터셋을 구축하였다. 수종분류를 위한 학습모델로 CNN 기법을 적용하였고, 데이터셋을 5:3:2의 비율로 훈련데이터, 검증테이터, 테스트데이터를 구분하여 모델의 학습 및 평가에 사용하였다. 모델의 전체 정확도는 89%로 나타났으며, 수종별 정확도는 소나무 95%, 자작나무 89%, 낙엽송 80%, 잣나무 86%, 신갈나무 98%로 나타났다.

• 한국동물학회:학술대회논문집
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• 한국동물학회 1999년도 한국생물과학협회 학술발표대회
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• pp.152.2-152
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• 1999

No Abstract, See Full Text

• Journal of the Korean Wood Science and Technology
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• 제39권2호
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• pp.125-131
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• 2011

The characteristics of radio-frequency/vacuum drying Japanese larch boxed heart round logs with 150 mm and 210 mm in diameter and 2,500 mm in length, subjected to compressive loading, after the pretreatment of kerf were investigated. The results of this study were as the follows: The drying time of about 120 hours~130 hours was needed from green to about 15 percent of moisture content. The gradient of final moisture content for all specimens was very gentle in both longitudinal and transverse directions owing to dielectric heating. The surface checks seriously occurred although the occurrence extent of surface check for the kerfed specimens was slight compared with that for the control specimens because drying stress was relieved by kerf. The occurrence of surface checks for the L-specimen was more serious than that for the S-specimen.

• Journal of the Korean Wood Science and Technology
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• 제19권4호
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• pp.7-17
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• 1991

The feasibility of treating three softwood(Japanese larch pitch pine, and Korean pine) thinned logs by double-diffusion treatment processes was investigated. Some posts were incised before immersion, and others were imersed in hot copper sulfate solution. Comparison among species indicated that. in general, pitch pine was most treatable and Japanese larch least treatable. For all three species, almost all treatment schedules gave consistently good penetration and high net retention, but very steep gradient of preservative distribution. As expected, the treatability was increased by the extension of immersion time, increased concentration of treating solution, incising. and heating of the first solution. Of the variables tested, it appears that heating of the first solution is the most important. From the data in this paper, it may be concluded that, if the first solution is not heated, the best schedule is #3. If the first solution is healed. it appears the best schedules are #10 or #11. Since heating of the first solution improves the treatability. schedules # 10 or :#11 are recommended if the cost of heating might be justified. The data presented in this paper indicate that double-diffusion treatment processes seem to offer a promise as a comparatively effective and easy-operating method of treating thinned logs for the small-scale production of treated stock.

• 한국산림과학회지
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• 제97권5호
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• pp.547-551
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• 2008

The study aimed to develop a cryopreservation method for long-term storage using mature somatic embryo of Japanese larch. In this study, desiccation treatments significantly affected re-induction rates of embryogenic tissue (ET) from dried somatic embryos. In the effect of different dehydration temperature and duration on the re-initiation ET. the highest frequency was shown when somatic embryos were dehydrated at $25^{\circ}C$ for 2 (45.5%) or 1 day (43.3%), respectively. In addition, low temperatures [$4^{\circ}C$, 2 days (44.2%) or 3 days (43.5%)] were marked higher ET initiation. After that, the initiation value was declined with dehydration duration. For comparison of different relative humidity on re-induction frequency of ET, the best re-induction (43.5%) was obtained from somatic embryos pre-dried at $(NH_4)_2SO_4$ (RH 79%). Both $Na_2HPO_4$ (RH 97%) and $Na_2CO_3$ (RH 88%) treatments were showed the similar rate, 34.6, 34.2%, respectively. However the lowest rate (19.6%) was observed in distilled water (RH 100%). In comparison of the various storage temperatures and duration of the dried somatic embryos, the highest frequency (66.9%) of re-initiation was obtained when somatic embryos were cryopreserved for one day. However, the frequency was gradually decreased as the time length of storage increased regardless of types of storage. None of ET re-initiated when stored at $4^{\circ}C$ for 1, 2 and 84 days.