• 한국해양학회지
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• v.3 no.1
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• pp.16-25
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• 1968

This study was undertaken to assess the annual cycle of primary production and plant pigments in a downstream of the Han River. Measurements were carried out at three week intervals during April 1966 and March 1967, and ancillary data include water temperature, transparency, pH, dissolved oxygen and phytoplankton cell number. The seasonal cycle in water temperature profile shows the hihgest in the end of August with 27$^{\circ}C$, lowest in the middle of February with 0.2$^{\circ}C$. The transparency with Secchi disk reading varied from a maximum 4.0m in fall and a minimum 0.5m or less in early spring and flood season of summer. The pH of the river water varied from 6.5 to 7.3, averaged 6.91 in the surface water and 6.98 in the bottom water, showed little seasonalvariability. The dissolved oxygen in the surface water ranged from 5.93-9.64ml/L, while in the bottom water it ranged from 5.54-9.72 ml/L, and the oxygen saturation never fall below 94%. None thermal, the distribution of pH and content of oxygen, stratifications occurred. An apparent seasonal cycle of primary productivity was observed with remarkably high levels in the spring and fall, the lowest level in the winter. The range of net carbon assimilations showed 3.1-112.6 mgC/㎥/day or 15-427 mgC/㎡/day in spring, 37.0-271.2 mgC/㎥/day or 115-329 mgC/㎡/day in summer, 27.2-168.0 mgC/㎥ /day or 139-415 mgC/㎡/day in fall and 0.5-10.9 mgC/㎥/day or 5-19 mg/㎡/day in winter, respectively. Amount of chlorophyll ${\alpha}$ ranged from a minimum concentration of 0.2-0.3 mg/㎥ in the middle of February and a maximum 4.1-6.7 mg/㎥ in the middle of June. A general increase trend in chlorophyll ${\alpha}$ concentration was noted with increase of the river water temperature.

• Resources Recycling
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• v.29 no.3
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• pp.24-35
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• 2020

Management of resource productivity is important for the reduction of natural resources and energy consumption. This is closely linked to circular economy which has recently been stressed worldwidely. Resource productivity is a key indicator which is to be managed in various industry sectors. Especially Korea which is heavily dependent on the natural resources import from overseas needs to give attention to this point. Nevertheless resource productivity related domestic researches and policies are extremely rare. This paper thus presents trends on resources productivities and their management policies of European countries and OECD G7 countries compared to the situation of Korea. In addition, the decoupling phenomenon of DMC (domestic material consumption) and GDP of Europe is analyzed and the resource productivity promotion strategy of Korea is proposed.

• JOURNAL OF ELECTRICAL WORLD
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• s.386
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• pp.56-57
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• 2009

인도차이나의 서쪽, 태국 라오스 중국 방글라데시 인도에 둘러싸인 미얀마는 비옥한 토양과 천연자원의 혜택을 입고 있는 나라이다. 에너지자원으로서는 풍부한 포장 수력이 있는 외에 천연가스의 혜택도 입고 있다. 경제적으로는 네 윈 정권 하에서의 쇄국경제체제 이후 해외로부터의 경제원조가 중지되고, ASEAN 가맹을 달성한 현재에도 민주화운동의 탄압에 대한 유럽 미국 등의 엄한 대응에 의하여 서방 여러 국가로부터의 경제원조는 제한되어 있다. 이 때문에 성장이 두드러지고 있는 ASEAN 여러 국가 중에서 뒤처지고 있다. 1인당 국민총생산(GDP)을 보더라도 237 미달러(2007년 IMF 추정)로 ASEAN 여러 국가 중에서도 가장 낮은 실정이다. 전력부문에 있어서는, 설비의 신설 갱신이 충분히 시행되지 못하여 공급력이 상당히 부족한 상태이다. 이러한 상황 하에서 미얀마 정부는 영해 내에서 산출되는 천연가스를 태국에 수출하여 귀중한 외화 수입원으로 하는 한편, 전원으로서는 수력을 선택하여 중국에서의 경제원조도 받아 대규모의 수력 개발을 위해 매진하고 있다. 이 글에서는 미얀마의 수력개발의 현황과 앞으로의 전망에 대하여 소개한다.

• Journal of the Korean Professional Engineers Association
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• v.12 no.4
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• pp.26-31
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• 1979

The Natural Gas and petroleum have the same Origin, Namely, Ocean bottom deposits of the marine plant, plankton which are subdued to the biological action of the bacterium under the anaerobic circumstance, and changed to the hydrocarbon gas and oils. and such resources are appeared in the aqueous sedimentary rocks in the tertiary. There are three types of gas field, which are oil well gas field, structural gas field and water soluble gas field.

• Prospectives of Industrial Chemistry
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• v.22 no.2
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• pp.25-43
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• 2019

미세플라스틱으로 인한 환경생태오염이 심화함에 따라, 기존 난분해성 플라스틱을 대체할 수 있는 친환경 소재에 관심이 높아지고 있다. 또한 석유 기반 자원의 고갈 및 이산화탄소 배출로 인한 온난화 환경문제 등으로 기존 석유계 플라스틱 소재를 대체 보완하는 친환경 천연소재 개발의 사회적 요구는 더욱 커지고 있다. 이에, 생분해가 가능한 천연자원으로부터 다양한 물리 화학적 엔지니어링 기능성을 추가하여 플라스틱의 환경문제를 극복하려는 시도들이 활발히 진행되고 있다. 본 기고에서는 나노셀룰로오스, 생분해성 고분자, 멜라닌 소재를 중심으로 친환경 기능성 천연소재의 최신 연구 동향을 소개하고, 이의 기존 합성 플라스틱 대체응용 방안의 가능성을 탐색한다.

• Environmental and Resource Economics Review
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• v.18 no.4
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• pp.787-813
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• 2009

Because of global warming, the thawing of the Arctic ice cap is slowly accelerating. That is the hot issue nowadays. According to the each country's climate change policy, it is boom in the world to lessen the consuming of the fossil fuel those are oil, coal and natural gas. But on the contrary the thawing of the Arctic ice cap is the chance to make the natural gas producing unit cost lower. The purpose of this paper is to search the Arctic policy of each country under the contradictory relationship between promoting the climate change policy and exploiting the natural gas on the Arctic. Specially, there are huge natural gas reserves in Russia on the Arctic region, Russia's exploiting the natural gas on the Arctic will affect on the natural gas supply-demand balance of world natural gas market strongly in the future. Therefore it needs to prepare the future energy alternative policy for Korea's energy security. Russia has Yamal Peninsular where is abundant on natural gas reserver, and she can supply natural gas by LNG ship all over the world via the Arctic route. This means that the structure of world natural gas market be changed gradually. It will be possible in 2030~2040. And such a change is very important because new natural gas trading type can do it through not only overcoming the geological restriction but also shifting the main trading type from PNG(Pipeline Natural Gas) to LNG(Liquified Natural Gas). Therefore it is necessary that we should let this be a good lesson to ourselves through the government action of other countries (China, Japan) those also have no sovereignty over the Arctic as Korea.

• Proceedings of the KSEEG Conference
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• 2001.05b
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• pp.6-15
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• 2001

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2003.10a
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• pp.101-106
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• 2003

• Journal of agriculture & life science
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• v.45 no.5
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• pp.33-39
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• 2011

This study was conducted to distribution characteristic of root diameter class between natural and planted stands of one-age class in Pinus densiflora for. eracta in Gangwon. Root development presented that 0.5-2.0 mm diameter class was large part in total root number and length but 0.5-2.0 mm diameter class have a low distribution in each stand. Below 5.0 mm diameter class between natural and planted stands observed outstanding natural stand more than planted stand, but reverse over 5.0 mm diameter class. Root development depending on soil level of vertical and horizontal was presented various natural stand more than planted stand because root distribution of planted stand was concentrated low soil level in 10 cm of soil depth and 20 cm of soil horizontal layer. We can understand that the root distribution presented different between natural and planted stand, therefore this result can used as a basic information for correct of outplanting.

• 전기의세계
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• v.15 no.2
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• pp.8-14
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• 1966

보편적으로 들수 있는 상용에너지 공급원으로는 신탄, 석탄, 석유, 천연가스, 수력을 들 수 있고 최근에는 핵분열(Nuclear Fission)을 이용한 원자력이 장래 에너지 공급원으로 가장 유망시되고 있다. 이 밖에 아직 상용으로 각광을 받지 못하고 있지만 금후 개발잠재력(Development Potential)을 갖고 있는 조력, 풍력, 태양열, 지열등이 있다. 이중 풍력은 주로 농사용 양수동력에 조력, 태양열, 지열은 발전용으로 상당히 이용되고 있는 지감도 있다. 본 고에서는 일차에너지인 수력, 석탄, 석유 천연가스 핵자원등에 대하여 살펴보기로 한다.