• Journal of the Korea Furniture Society
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• 제25권4호
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• pp.345-352
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• 2014

This study was carried out to develop eco-friendly wood street lamp (EFWSL) by using wood resources stacked in the forests after tree tending operations which were mostly abandoned, but economical as renewable wood resources for developing the wood coated street lamps with the effects of cost reduction and their attractive appearances. This study has led to the development of key compact structures of street-lighting wood poles (shaft) using laminated timber. The core technique in this study is related with producing the more stable wood poles (shaft) with the hole inside than wood poles exposed under the natural environment through applicable process to protect the wood from bursting and splitting. We also comprehensively developed the method to conserve the timber durability of wood shaft and connect the wood shaft with groove, race way to be located in the groove, locking ring, current stabilizer connected to the groove and luminaire support arm, base and hand-hole which was partly used in combination with steel materials and wood. Also we increased the utilization of abandoned and stacked woods after thinning in the forests such as Pinus densiflora, Larix leptolepis, and Pinus koraiensis plantations by maximizing the value of these natural wood resources as main materials of eco-friendly street lightings with the effects of cost reduction and attractive appearances and also the expectation of advertising effects of street lightings developed in this study.

• Journal of Conservation Science
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• 제8권1호
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• pp.16-22
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• 1999

Species of 741 charcoal samples, which were excavated from the dwelling sites of the bronze age $(about\;2500\~3100\;B.P)$ at Hyeonwha-ri, Pyungteak, Korea, were identified. Most of samples were deciduous oaks (Quercus spp.; $97.7\%$) and others were alders (Ainus spp.; $1.9\%$) and soft pines (Pinus spp.; $0.4\%$). Tree rings of nine largest samples were also examined. The numbers of annual rings were 8 to 36 and mean ring width was rather narrow $(0.65\~1.82\;mm)$. Most samples possessed pith and tylosis. The results indicate that logs 10 to IS cm diameter had been used for the poles of houses without further processing.

• Journal of Conservation Science
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• 제35권6호
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• pp.670-680
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• 2019

This study attempts to identify whether there were preferred wood species or any required properties depending on the use of wooden objects by comparing wood species analysis results of wooden objects, which are classified specifically by their uses like comb, wooden tablets, containers, etc., excavated from Haman Seongsansansung mountain fortress, which is the archaeological site of the Three Kingdoms era and those excavated from archaeological sites in Gyeongsang province considered to be the similar era of Haman Seongsansansung mountain fortress site. Wooden tablets and combs show the preferred species clearly and containers preferred wood species with the mid-ranged strength and the resistance against moisture migration.

• Journal of Conservation Science
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• 제31권4호
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• pp.341-350
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• 2015

The preservation has been conducted for wooden ship timber excavated from Bonghwang-Dong, Gimhae, Korea. The species were analyzed for conservation as pre-treatment. Outer panel was analyzed as Cinnamomum spp. and trapezoid wooden material, wooden wedge was Cryptomeria japonica D. Don.. Wooden ship timber have been treated by vacuum-freeze drying after impregnation with aqueous PEG#3,350 solution(almost 45%). The timber of Bonghwang-Dong ship is considered as Japanese ship that many data such as conformation of ship, location of site, japanese artifact of around site were confirmed. In addition, The ship timber give us the important information about the international trade with Japan.

• Journal of the Korean Wood Science and Technology
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• 제42권4호
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• pp.385-392
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• 2014

The purpose of this study was to determine the effects of plantation thinning on physical and mechanical properties of Larix kaempferi. Tree samples were obtained from unthinned, moderately, heavily thinned plantations where located in Kwangryung forest research stand. The effects of different thinning methods on the bending and parallel to grain compressive strengths of Larix kaempferi were explored. Average latewood ratio with various thinning treatments revealed the trend of unthinning < moderate thinning < heavy thinning treatment. Average annual ring width with various thinning treatments showed the trend of unthinning < moderate thinning or heavy thinning treatment. Average bending and parallel to grain compressive strengths with various thinning treatments revealed the trend of unthinning > moderate thinning > heavy thinning treatment. This indicates that thinning treatment reduces average bending and parallel to grain compressive strength properties.

• Korean Journal of Environment and Ecology
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• 제14권1호
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• pp.46-56
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• 2000

Vegetation structure of $Hwangs\v{o}ng$ Park in $Ky\v{o}ugju$ was investigated to study ecological value and to suggest a desirable management proposal. To do this, twenty plots were set up and surveyed. The $Hwangs\v{o}ng$ Park forest was classified into five plant communities by the DCA technique, which were two types of Pinus densiflora communities, Quercus spp.-P. densiflora, Robinia pseudoacacia and Q. mongolica community. In the diversity analysis, 29 woody species were observed, but species composition was simple. No. of average species is $5.4\pm2.9$ per a plot($100m^2$), and Pinus densiflora is a dominant species in DBH $27\sim47cm$ class. From the results of tree ring and growth analysis, it was found out that pinus densiflora community of $Hwangs\v{o}ng$ Park has a historical and ecological value, but recently the growth rate was decreasing. The management proposal was suggested upon to the above results.

• Proceedings of the Korea Water Resources Association Conference
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• 한국수자원학회 2011년도 학술발표회
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• pp.425-425
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• 2011

가뭄은 짧게는 한 계절에서 1년, 길게는 10년 이상 지속되는 등 시간 규모가 다양하며, 그 시작과 끝을 명확하게 정의하기 힘든 특성이 있다. 이와 같이 나타나는 가뭄의 장기적 발생 특성으로 인해 지역의 가뭄 특성을 정확하게 분석하기 위해서는 장기간의 자료를 필요로 한다. 그러나 우리나라의 경우 근대적인 관측은 1900년대 초반에 시작되었으며, 현재 운영 중인 대부분의 관측 시설은 1970년대부터 이용 가능한 자료가 존재하는 상황이다. 미국의 경우에도 1800년대 후반부터 관측된 자료를 이용하여 가뭄 및 홍수 분석을 수행하고 있는 실정이다. 이러한 점을 보완하여 보다 장기간의 가뭄 특성 관련 정보를 확보하기 위한 노력이 많은 연구자들을 통해 지속되어 왔다. 강수량이나 유출량 등 근대 관측 이후 이용이 가능한 자료를 통해서도 가뭄과 관련된 유용한 정보를 획득할 수 있으나 보다 장기간의 정보를 확보하기 위해 나이테 등 다양한 기후 지표를 이용한 연구가 수행되고 있다. 특히 과거 가뭄 특성에 대한 복원을 위해 나이테자료를 이용하는 연구는 미국을 중심으로 매우 활발히 이루어지고 있다. 또한 몽골이나 티베트, 중국 등과 같이 근대 기상 관측 자료가 매우 부족한 지역을 대상으로 가뭄 특성을 분석하기 위해 해당 지역에서 확보된 나이테 자료를 이용하는 연구가 매우 활발하다. 그러나 우리나라에서는 나이테자료와 가뭄 특성 간 관계를 검토하고 나이테자료에 근거하여 과거 가뭄 특성을 복원하려는 노력이 거의 전무한 실정이라 할 수 있다. 따라서 본 연구에서는 근대 관측 이전에 대한 가뭄 특성을 복원함에 있어 나이테자료의 활용가능성을 파악하기 위해 가뭄 특성을 나타내는 가뭄지수와 나이테자료의 상관관계를 분석하였다. 이를 위해 우리나라 및 주변 국가에서 확보된 나이테자료를 이용하였으며, PDSI, SPI 등 기존 가뭄지수를 분석에 함께 활용하였다. 본 연구에서 제시된 연구결과는 향후 나이테자료를 기반으로 근대 관측 이전에 대한 가뭄 특성을 복원하는데 있어 유용한 기반 정보로 활용될 수 있을 것으로 판단되며, 나이테자료 등 기후지표를 이용한 가뭄 관련 연구의 기초 정보로 이용될 수 있을 것이다.

• Journal of Korea Water Resources Association
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• 제37권1호
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• pp.55-66
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• 2004

The Hapchon Dam, located upstream of the Hwang River, Korea, was constructed in December, 1988. Due to the lack of storage of water, the dam gate has not been operated during last ten years. Thus, a new ecosystem has been established at the downstream part of the dam. This is not a common phenomenon which can be found elsewhere in the country. The present study investigates the effect of flow regime change on the river morphology and vegetation cover in the downstream river reach after the dam construction. The analysis of flow regime is carried out, and the changes in bed elevation and in channel cross sections are examined. Site investigations including tree ring tests are also performed. The increase in the vegetation cover is estimated by comparing aerial photographs taken before and after dam construction.

• Journal of Conservation Science
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• 제33권4호
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• pp.275-281
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• 2017

The purpose of this study was to carry out radiocarbon dating using a wiggle match, of wooden boards and grains from the Mado shipwreck No. 4, which was excavated from Mado in Taean-gun, Chungcheongnam-do. The result of the wiggle matching for four decennial tree-ring samples of the stern plank produced a ${\pm}2{\sigma}$ radiocarbon date (95.4% confidence interval) of A.D. 1337-1356 or A.D. 1412-1429. The grains produced a ${\pm}2{\sigma}$ radiocarbon date (95.4% confidence interval) of A.D. 1415-1455. This indicated that the Mado shipwreck No. 4 belonged to the early or middle of the 15th century. These radiocarbon dating results correlate with the date that was speculated by archaeologists according to the ship's structure and ceramic style.

• Korean Journal of Agricultural and Forest Meteorology
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• 제8권3호
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• pp.145-151
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• 2006

The purpose of this study was to analyze the relationship between the annual variation in diameter growth of Quercus spp. and climatic factors such as monthly temperature, precipitation and solar radiation in central and northern Korea. Annual diameter growth was measured by using stem cores of 262 Quercus trees, and the correlation between the diameter growth and the climatic factors was analyzed. Mean diameter growth of Quercus spp. in Jungwangsan was larger than that in Woraksan, and mean diameter growth by the species was large in order of Q. serrata>Q. variablis>Q. mongolica>Q. dentata. The diameter growth pattern of Quercus spp. in Woraksan was different from that in Jungwangsan. Positive correlations between diameter growth of Quercus trees and temperature or the solar radiation during July were found in Jungwangsan. Significant correlations between diameter growth and solar radiation during March and precipitation during June were found in Woraksan. It is suggested that climatic factors similarly affect the diameter growth of Quercus spp. in a mountainous terrain, but influences of the climatic factors depend on other environmental conditions such as altitude, topography and soil depth.