• 한국자원식물학회지
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• 제28권4호
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• pp.400-410
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• 2015

Juniperus chinensis (Cupressaceae) is a valuable woody plant resource, but this rare plant is only distributed in restricted regions in Korea. In this study, we surveyed the geographic distribution regions, variation of sex ratio and the dynamics of natural populations of J. chinensis. in order to establish conservation strategies for the sustainable conservation of this important resource tree. The 17 natural populations of J. chinensis are restrictively distributed in the shore cliffs of (1) Ulleungdo island, (2) Gyeongju-si to Gangneung-si of the eastern coast, the riverside cliff along (3) Donggang-river of Jungsun-gun and Pyeongchang-gun and (4) branch of Nakdonggang-river in Uiseong-gun. The populations in Ulleungdo island showed continuous population distribution of over 200 individuals, but populations in other regions had discontinuous population distribution of under 200. The population of J. chinensis surveyed in Korea was estimated in ca. 3,200 individuals. The sex ratio (male/female) among populations of J. chinensis was diverse with variation from 0.46~1.67 range, but showed no significance. The sex ratio of the total individuals by species level was 0.74, and the percentage of female tree was significantly higher than the male. The results of dynamics analysis within population among regions showed that seedlings and saplings of J. chinensis in three regions surveyed were continuously regenerating. The distribution of DBH class showed a stable population structure of inverse J shape graph, but fragmentation and decrease in populations because of invading broad-leaved shrubs and trees from the surroundings were concerned. Further studies, and in situ and ex situ conservation strategies for the sustainable conservation on natural populations of this rare resources woody plant, J. chinensis in Korea are recommended.

• 한국자원식물학회지
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• 제20권1호
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• pp.1-6
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• 2007

한반도 희귀식물인 백운산 나도승마 자생지에 대한 식물사회학적 조사를 수행하였다. 본 조사지의 식생은 전형적인 온대남부의 참나무림으로서 토양습도는 높고, 아고산지역의 평평한 지역으로 조사되었다. 본 조사지는 동아시아에만 한정적으로 분포하는 나도승마 보전을 위한 매우 중요하다. 그러므로 장기생태 관측을 통한 연구를 통하여 보전지구로의 지정 등의 보전방안이 시급히 마련되어야 할 것으로 생각된다.

• 산업경영시스템학회지
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• 제37권4호
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• pp.82-89
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• 2014

Recently, the mineral resource protection policies and regulations in production countries of natural resources including rare metals are becoming more stringent. Such environment makes which market has malfunction. In other word, those are not perfect or pure market. Therefore because each market of natural resources have special or unique characters, it is difficult to forecast their market prices. In this study, we constructed several models to estimate prices of natural resources using statistical tools like ARIMA and their business indices. And for examples, Indium and Coal were introduced.

• 자원리싸이클링
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• 제28권6호
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• pp.9-17
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• 2019

4차산업 혁명과 에너지 신산업 등의 성장에 따라 희유금속의 사용이 계속하여 증가하고 있으며, 희유금속의 사용 증가에 따라 희유금속의 재활용이 중요해 지고 있다. 본 논문에서는 희유금속 중 하나인 주석 소재의 국내·외 품질 기준 현황과 재활용된 주석의 성능 테스트에 관해 조사하였다. 성능 테스트 결과, 천연자원 주석과 재활용된 주석의 성능 차이는 없는 것으로 분석되었다.

• 마이크로전자및패키징학회지
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• 제18권2호
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• pp.1-9
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• 2011

Rare metals, called as vitamins of industry, are defined as the elements which are very few in the earth and are difficult to extract from ores. The requirements for total amounts of rare metals have increased as the global economics grows and the function of electronic components varies considerably. The rare metals have been maldistributed to America, CIS(Commonwealth of Independent States), China, Australia, Canada as about 80% of total natural resources, which also lead to unequal materials flow or distribution. Therefore, it was needed to investigate the feature of rare metals in terms of industry as well as technology. We could identify the industrial issues associated with the supply of critical rare elements in electronic components.

• 식물분류학회지
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• 제42권2호
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• pp.167-170
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• 2012

희귀식물 분포연구의 일환으로 조사 과정 중 국내 분포가 명확하지 않고 극히 한정된 지역에 분포하는 양치식물 2종의 신분포지가 확인되었다. 함경도와 강원도에 분포하는 것으로 알려진 보태면마(Dryopteris coreano-montana)가 전남 장성군 입암산에서 확인되었으며, 제주도 남쪽에서 드물게 자라는 난대성 양치식물인 공작지네고사리(Dryopteris decipiens)가 전남 장흥군 천관산에서 발견되었다.

• Natural Product Sciences
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• 제16권3호
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• pp.198-201
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• 2010

Acanthopanax divaricatus var. albeofructus is one of the indigenous medicinal plant and the fruits of Acanthopanax spp. used as a remedial for "wipe out evil wind". Two anthocyanin were isolated from the fruits of Acanthopanax divaricatus var. albeofructus. Their structures were elucidated as cyanidin 3-lathyroside (1) and cyanidin 3-galactoside (2) by chemicophysical and spectroscopic analysis. And also, four chemical, syringin, chlorogenic acid, caffeic acid and acanthoside D were identified. Both anthocyanide were isolated for the first time from Acanthopanax species. cyanidin 3-lathyroside is one of the rare anthocyanin in natural resources.

• 한국조경학회지
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• 제30권2호
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• pp.39-49
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• 2002

The purpose of this study is to propose an objective and rational methodology for the selection of proposed sites far the National Trust(NT), which is the new alterative proposal far the conservation of natural environments destroyed by injudicious land development and economic growth. That is to enforce many analysis for the effective estimation of rare ecological and landscape resources and to propose a model based on estimation and united indicators. Using the estimative model, we apply it to the selection of the proposed site in micro scale and simultaneously offer the basic methodology of effective and systematic land conservation in macro scale. The results of this study are as follows: 1) The results of analysis for the reliability of estimative items and indicators, presented no problem in that the coefficient of reliability was over 0.7. 2) The correlation measure of the estimative indicator indicated that 'succession'and 'regenerating restorability' were highly correlative in the item of plants. Another three items showed a tendency to be alike. 3) The results of factor analysis on the characteristics of indicators, classified plants into four categories including a stable factor. The item of animals was classified as a stable and rare factor. The item of landscape was classified as a physical and mental factor and the environment as a pollutional and conditional factor. 4) The model of estimation created through factor analysis was valid for the approval of the regression model because significant probability was 0.00. When we consider the NT proposed site as a complex body that is composed of diverse natural and manmade resources, certainly the synthetic methodology of estimation is needed. If these studies are carried out, NT sites will be selected more rationally and effectively than at present. Consequently, they have the potential to play a core role of natural ecosystem conservation in Korea.

• 한국환경생태학회지
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• 제20권2호
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• pp.130-142
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• 2006

월출산은 남부형 식물의 북한계 선상에 위치하는 국립공원으로 식물지리학적으로 중요하며, 확인된 소산식물은 106과 318속 453종 59변종 4품종으로 총 516종류이다. 산림청이 지정한희귀 및 멸종위기종은 산닥나무, 수정난풀, 께묵, 끈끈이주걱, 통발 및 이삭귀개 등 6종이었다. 식물구계학적 특산식물 종 중 III등급에서 V종은 12종으로 확인되었다. 귀화율은 4.65%, 도시화지수는 9.06%로 확인되어 비교적 낮은 비율로나타났다.

• 한국환경생태학회지
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• 제19권2호
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• pp.112-118
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• 2005

월악산국립공원지역에 분포하는 식물 중에서 환경부 지정의 식물구계학적 특정 식물 종은 I등급에 29분류군, II등급에 12분류군, III등급에 II분류군, IV등급에 9분류군 및 V등급에 6분류군 등 총 68분류군을 확인하였다. 환경부 지정 멸종위기 야생 동$\cdot$식물 II급종은 솔나리와 망개나무 2분류군을 확인하였다. 산림청 지정 희귀 및 멸종위기 식 물은 고란초, 솔나리, 망개나무, 땅나리 , 천마, 쥐방울덩굴, 모감주나무, 흰참꽃, 미치광이 풀, 개불알꽃, 백작약 및 백리향 등 12분류군이었다.