• 한국환경과학회지
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• 제19권3호
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• pp.305-312
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• 2010

The purpose of this study is to compare the relative growth of annual ring width of red pine(Pinus densiflora), black pine(Pinus thunbergii) and pitch pine(Pinus rigida) by means of multiple regression method according to Graybill hypothesis. The obtained results are as follows. 1. The changes of rainfall have affected to tree growth during the periods of 1975 through 1978. 2. Among these pine trees, red pine was mostly influenced by environmental factors. 3. The growth of annual ring width was sensitively responded to the changes of rainfall and air temperature. 4. Among the heavy metals analyzed, the concentrations(ppm) of Lead(Pb) and Copper(Cu) were negatively effected on the growth of annual ring width of pine trees. 5. The analytical technique of annual ring width may be useful for estimation of the pollution in forest areas near industrial complexes.

• 한국균학회지
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• 제49권4호
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• pp.469-476
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• 2021

송이는 상업적으로 중요한 야생 식용 버섯이다. 현재까지 송이 재배는 송이감염묘를 이용한 것이 유일한 방법이다. 2020년 송이감염묘로부터 21개의 송이가 홍천 송이시험지에서 발생하였다. 송이감염묘 생산지역의 송이와 이식한 송이감염묘로부터 발생한 송이는 모니터링을 통해 확인하였고, 13개의 microsatellite 마커를 이용하여 분석한 결과 동일한 것이 확인되었다. 송이감염묘는 송이균환 형성과 송이 발생에 성공하였고, 송이발생은 2010년과 2017년부터 2020년까지 발생하였다. 결론적으로 송이 버섯발생은 송이감염묘의 송이균에서 기원한 것이다.

• 한국기후변화학회지
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• 제9권3호
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• pp.293-302
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• 2018

This study was carried out to provide basic information on efficient preservation and management of an Abies koreana forest through analyzing the ecological characteristics by slope in Seseok, Mt. Jirisan. Soil moisture content at southern and northern slopes was 29.9% and 21.7%, respectively, and there was no significant difference among soil properties between southern and northern slopes. The importance value of A. koreana in the southern and northern slopes was high for tree and subtree layers, respectively. It is noteworthy that many seedling and saplings of A. koreana were present on the southern slope. The species diversity was 0.413 for the tree layer, 0.632 for the subtree layer, and 0.609 for the shrub layer on the southern slope and 0.396 for the tree layer, 0.783 for the subtree layer, and 1.215 for the shrub layer on the northern slope. Evenness and dominance ranged from 0.371 to 0.609 and 0.629 to 0.391 on the southern slope and from 0.380 to 0.968 and 0.620 to 0.032 on the northern slope, respectively. The mortality of A. koreana was 9.6% on the southern slope and 24.4% on the northern slope, a distinct difference between the slopes. The mortality type at two slopes was the highest proportion of standing dead. Annual mean tree ring growth of A. koreana on the southern slope (1.76 mm/yr) was higher than that on the northern slope (1.64 mm/yr).

• 한국경영과학회지
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• 제32권4호
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• pp.51-60
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• 2007

In this study, we consider the minimum ADM problem which is the fundamental problem for the cost-effective design of SONET ADM embedded in WDM ring networks. To minimize the number of SONET ADMs, efficient algorithms for the routing and wavelength assignment are needed. We propose a mathematical model based on the graph theory for the problem and propose a branch-and-price approach to solve the suggested model effectively within reasonable time. By exploiting the mathematical structure of ring networks, we developed polynomial time algorithms for column generation subroutine at branch-and-bound tree. In a computer simulation study, the suggested approach can find the optimal solution for sufficient size networks and shows better performance than the greedy heuristic method.

• 한국문화재보존과학회:학술대회논문집
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• 한국문화재보존과학회 2003년도 제17회 학술대회 발표 논문집
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• pp.27-27
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• 2003

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2001년도 학술발표회 논문집(I)
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• pp.146-151
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• 2001

No Abstract (See Full-text)

• 한국제4기학회지
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• 제17권2호
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• pp.139-144
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• 2003

The purpose of this study is to identify the species and to date the woods used in the Keunjung-jeon Hall, main building of the Kyungbok palace in Seoul. Samples (144) were divided into two parts, pillars (52) and other wood materials (92). Only two species were identified. They were Abies holophylla Max. and Pinus densiflora Sieb. et Zucc.Eleven among 20 Pyungju (outer pillars) were Abies holophylla, and 9 were Pinus densiflora. Seven among 12 Naejinkoju (inner pillars) were Abies holophylla, and 5 were Pinus densiflora. Three among 4 Gwikoju (inner corner pillars) were Abies holophylla, and one was Pinus densiflora. In the other wood materials, only 2 of 92 were Abies holophylla, and the others were Pinus densiflora. Tree-ring dating proved that this building was reconstructed during late 1860s. It also revealed that the old woods cut in the 17th century were reused.

• Journal of the Korean Wood Science and Technology
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• 제51권5호
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• pp.345-357
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• 2023

The present study conducted a stem analysis to trace growth information of Japanese larch (Larix kaempferi) and predict the future changes in growth volume. For this purpose, six L. kaempferi trees over 47 years old were cut at 1-2 m intervals from a height of 0.2 m, and circular plates of 5 cm thickness were collected for stem analysis. The analysis indicated that approximately 1-8 years are required to grow up to chest height. The annual height and diameter growth increased rapidly until the trees are 15 years old and gradually decreased after 20 years. The volume of 30-year-old trees in Oegam-ri forests, which were well-managed after artificial reforestation, was 0.4837 m³, whereas that in unmanaged Singi-ri forests was 0.1956 m³. Although the volume of individual trees differed greatly depending on the forest management status, it was found that the volume increased by 1.67-1.76, 2.49, and 3.49 times at 40, 50, and 60 years age, respectively, compared to the legal harvesting age 30. Therefore, factors such as the carbon dioxide reduction effect, forest management benefits, and the condition of trees at the site should be considered before harvesting trees.

• 대한화학회지
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• 제15권6호
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• pp.370-377
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• 1971

The Carbon-14 content in surface air at Seoul, Korea, was measured from February 1970 to August 1971 and a Larix Leptolepis, Gordon tree (Ip-Gal Namu) grown at Kwang-Nung, Kyunggi-Do, Korea, having 37 growth rings, was assayde for $^{14}C$. From the results of the surface air study, it was calculated that during the above period the inventory of excess $^{14}C$ in the atmosphere decreased with a half-time of 4.6 years. The overall yearly decrease was also checked. The tree-ring study showed that the tree's atmosphere was affected by $^{14}C$ from nuclear tests after 1956. In one study, atmospheric $CO^2$ samples were collected bi-monthly by the absorption of $CO^2$ in alkaline hydroxide solution. In the other, 5 year annual growth rings were assayed for radiocarbon. For the radioactivity measurement, carbon atoms in samples were converted to carbon atoms of benzene. The resulting benzene was taken as primary solvent for liquid scintillation counting.

• 한국산림과학회지
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• 제85권3호
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• pp.462-471
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• 1996

본 연구는 인공호수(人工湖水) 조성에 의한 기상환경(氣象環境) 변화(變化)가 주변지역의 수목생장(樹木生長)에 어떻게 작용하는지 밝히기 위하여 수행되었다. 이를 위하여 먼저 지형기후학적(地形氣候學的)인 방법에 의하여 임하댐 주변지역의 담수전(湛水前)과 담수후(湛水後)의 기후값을 추정(推定)하고, 그 편차(偏差)에 의하여 담수에 의한 기상환경 변화를 정량화(定量化)하였다. 또한 임하댐 주변에 생육하고 있는 소나무를 대상으로 거리별(距離別)로 30m에서 5km까지 6단계로 나누어 생장(生長)을 분석(分析)하고 기상변화와 비교함으로써 댐 건설에 의한 기상환경 변화가 주변지역의 수목생장에 미치는 영향(影響)을 정량적으로 분석하였다. 댐이 건설된 이후의 수목생장(樹木生長)은 댐으로부터 1km 이내의 가까운 거리에 있는 수목은 생장이 증가(增加)고 있었지만, 1km 이상 떨어진 지역에 생육(生育)하는 임목은 기상환경 변화와 무관(無關)함을 알 수 있었다. 댐에서 가까운 지역에 생육(生育)하는 수목의 생장 증가는 주로 봄철의 강수량(降水量) 증가와 생육기간 동안의 일사량(日射量) 총량이 담수전에 비하여 늘어난 것에 기인(起因)한 것으로 판단된다. 그러나 월평균기온(月平均氣溫)의 변화량(變化量) 소나무 생장에 큰 영향을 미치지 못한 것으로 추측(推測)되는데 이는 변화량 자체가 크지 않았기 때문으로 생각된다.