• Title, Summary, Keyword: 자원량

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Estimation of Total Material Requirement in Expressway Construction using Material Flow Analysis which is based on the Life Cycle Assessment (LCA기반 물질흐름분석 기법을 이용한 고속도로 건설에서의 총 자원요구량 산정)

  • Kong, Chan-Hwi;Hwang, Yong-Woo;Moon, Jin-Young;Kwak, In-Ho
    • Journal of Korean Society of Environmental Engineers
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    • v.38 no.8
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    • pp.403-410
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    • 2016
  • During expressway construction it has been input a lot of material, but it does not manage to estimate quantitatively. In this study, the total material requirement for construction of expressway, which separated direct material requirement and indirect material requirement each section was quantified by combining life cycle assessment (LCA) and material flow analysis (MFA). In the direct material requirement, sand 2.27E + 04 ton/km, limestone 1.02E + 04 ton/km and gravel 4.47E + 03 ton/km were required, in the indirect material requirement, gravel 2.75E + 04 ton/km, iron 9.80E + 03 ton/km and coal 9.74E + 03 ton/km were required. Material such as sand, limestone which has high direct material requirement is require of excess input prevention from construction site, and material such as iron, rare metals(chrome, nickel) and coal which has high indirect material requirement is require additional studies of resource management.

Optimal Management of Mackerel in Korea: A Maximum Entropy Approach (최대 엔트로피 기법을 이용한 한국 연근해 고등어 최적 관리에 관한 연구)

  • Park, Yunsun;Kwon, Oh-Sang
    • Environmental and Resource Economics Review
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    • v.28 no.2
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    • pp.277-306
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    • 2019
  • Mackerel is one of the most widely consumed aquatic products in Korea. Concerns about the depletion of stocks have also arisen as the catch has decreased. The primary purpose of this study is to estimate the mackerel stock and derive the optimal level of catch in Korea. We apply a generalized maximum entropy econometric method to estimate the mackerel growth function, which does not require the steady state assumption. We incorporate a bootstrapping approach to derive the significance levels of parameter estimates. We found that the average ratio of catch to the estimated total stock was less than 30% before the 1990s but exceeded 40% in the 1990s. After 2000, it dropped back to about 36%. This finding indicates that mackerel may have been over-fished in the 1990s, but the government regulations introduced in the 2000s alleviated over-fishing problems. Nevertheless, our dynamic optimization analysis suggests that the total allowable catch may need to be carefully controlled to achieve socially optimal management of resources.

A Bioeconomic Analysis on the Effectiveness of Marine Protected Area (MPA) (MPA 효과에 대한 생물경제학적 분석)

  • Kim, Dohoon
    • Environmental and Resource Economics Review
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    • v.13 no.4
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    • pp.657-684
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    • 2004
  • This study is a theoretical bioeconomic analysis to analyze the effectiveness of Marine Protected Area (MPA) implemented in different stock spatial distributions: Closed System, Source-Sink System, and Density-dependent System. In the analysis, an economic impact of vessel activities is also included and a joint effectiveness of MPA and input control is investigated as well. Results of the analysis show that total fisheries stocks are increased in all systems. However, total harvests are decreased when MPA is implemented in the closed system and in the sink patch of source-sink system. On the contrary, total harvests are increased or decreased according to the rate of stock migration and the level of fisheries stocks in the source patch of source-sink system and in the density-dependent system. Specifically, total harvests are increased more significantly as the rate of migration increases and the level of stock increases higher. In addition, the increase in fishing efforts is restricted due to the increase in fishing cost. Therefore, fishing efforts could not be increased greatly in the fishable area. When input control is combined with MPA, the total stocks could be more increased.

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Analysis of Biomass Energy Potential and Density in Korea (국내(國內) 바이오매스 에너지 잠재량(潛在量) 및 밀집도(密集度) 분석(分析))

  • Kook, Jin Woo;Shin, Ji Hoon;Yoo, Ho Seong;Lee, See-Hoon
    • Resources Recycling
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    • v.22 no.5
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    • pp.56-62
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    • 2013
  • The biomass resources is one of promising ways to solve energy exhaustion issues and global warming issues at the same time. To evaluate domestic biomass resources potential such as agricultural wastes, forestry wastes, livestock wastes and municipal solid wastes, statistics data from various organizations were collected and analyzed in this study. Also, space energy densities of each districts in Korea were calculated and analyzed. The results from the evaluation of biomass energy potential and space energy densities in Korea might be useful to estimate the availability of biomass energy conversion processes and to choice a appropriate process to convert domestic biomass into energy.

Dust Fall Property of Open Cut Limestone Mine (석회석 노천채광장의 분진 비산특성)

  • 이상권;김복윤;조영도;김임호
    • Explosives and Blasting
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    • v.17 no.2
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    • pp.45-51
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    • 1999
  • To find out the characteristics and trend of dust fall in open cut limestone mine in-situ measurement and wind tunnel tests were carried out. In-siti measurement was done by two dust fall samplers at the Halls mine for 60 days. The laboratory test was done in the 100m long temporary wind tunnel installed at the yard of the institute. The most of dust falled within 25m form the dust source and only less than 0.5% defused up to over 100 meters. It was known that the dust fall at 100m away from souces were negligible.

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남극 남쉐틀란드 군도 주변 해역의 크릴 분포 및 자원량

  • 강돈혁;이윤호;신형철;나정열
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • pp.391-392
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    • 2001
  • 남극 크릴(Antarctic krill, euphausia superba)은 남극해의 생태계 피라미드의 하위부분을 차지하고 있지만 동물플랑크톤과 고래, 어류, 펭귄, 조류 등의 상위 포식자들을 연결하는 중요한 연결고리의 역할을 하고 있다. 많은 생체량과 남극해 전체에 골고루 분포하고 있는 크릴은 생태계 자체의 연구뿐만 아니라 수산자원 연구의 중요한 부분을 차지하고 있으므로 분포 위치, 자원량에 대한 연구가 최근 들어 활발히 진행되고 있다. (중략)

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임자도 주변해역의 자치어 분포

  • 전송미;조영철;최옥인;이성환
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • pp.300-301
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    • 2000
  • 우리나라 서해안은 조간대가 넓게 발달하여 있고 조차가 매우 크므로 물의 혼합이 잘 이루어져 먹이가 풍부하며, 탁도가 높아 포식의 위험이 적어 어류의 산란장이나 생육장으로 중요한 역할을 하고 있다. 어류는 난에서 부화하여 자치어기를 거쳐 성장하면서 성어가 되고 어업에 가입이 된다. 어류의 초기 발생 시기에는 주변해역의 환경요인에 영향을 가장 많이 받는 시기로 자치어 생존율은 어류 자원의 크기를 결정짓는다(May,1974). 따라서 어류 자원량 추정과 미래 자원량을 예측하기 위해서는 자치어의 출현량과 분포에 관한 연구가 중요한 정보가 된다. (중략)

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A Pragmatic Approach for Determining Overfishing and Overfished Condition for Assessing Data-deficient Fisheries (평가자료가 결핍된 어업의 과도어획상태와 자원의 남획여부를 결정하는 실용적인 방법)

  • Zhang, Chang-Ik;Lee, Jae-Min
    • Journal of Fisheries and Marine Sciences Education
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    • v.25 no.5
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    • pp.1009-1019
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    • 2013
  • 본 연구는 어업자원이 건강한 상태에 있는지 아니면 남획된 상태에 있는지를 판단하고, 현재 어업활동이 과도한지 아닌지를 판단하기 위한 간단하고 실용적인 방법을 개발하였다. 자원평가를 수행시에는 고가의 자료와 고도의 기술력이 요구되는 어려움이 있는데, 특히 소규모 어업과 다종어업에서 어려움이 더욱 심하다. 본 연구에서 개발된 방법은 어업자원의 구체적인 상태와 어업활동의 객관적인 상태를 고려해서 어업자원을 보존하고 어업활동을 규제할 수 있는 실용적이고 신뢰할 수 있는 방법이다. 예를 들어, 자원량과 어획사망률을 추정하는데 필요한 자료가 없거나, 추정할 수있는 과학적 능력이 부족한 경우에는, 자원량을 대용해서 단위노력당어획량을 사용하고 어획사망률을 대용해서 어획노력량 자료를 사용할 수 있다. 본 연구에서 제시한 방법의 실현가능성과 유용성을 입증하기 위하여, 복수어종으로 집계된 어획량과 어획노력량 만으로 된 경우나 또는 개체군 특성치 정보와 체장자료 만이 이용 가능한 경우에 대해 적용하였다. 이 방법은 수산자원의 보존이라는 전지구적 목표를 달성하는데 있어서, 필요한 자원상태와 어업상태를 판단해서 어획활동을 규제하고 조정할 수 있는 유용한 방법이 될 수 있을 것으로 보인다.

Resource Estimation of Actosity Gold Mineralized Belt, Uzbekistan (우즈베키스탄 악토시티 금광화대 자원량 평가)

  • Chi, Se-Jung;Park, Sung-Won;Kim, In-Joon;Heo, Chul-Ho
    • Economic and Environmental Geology
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    • v.47 no.2
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    • pp.169-180
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    • 2014
  • Surface geological and trench surveys and drilling exploration (total length, 1,100 m; 9 drill holes) were carried out to secure new Au ore bodies in the area($0.96km^2$) of Actosity gold field, where is located at the western Kuldjuktau mineralized district in the middle territory of Uzbekistan. Several Au ore bodies occurring as tabular or lens shapes with thickness of 0.5~35 m were newly discovered on the outcrops and extended to $N40{\sim}70^{\circ}\;W$ direction with dipping of $70{\sim}90^{\circ}$ SW or NE. Indicated ore resource of gold with Au grade of 0.25~3.52 mg/kg was newly estimated by 2,382 t(gold resource of 2.5 t) as a result of 9 drilling exploration in 2010~2012 from the Actosity gold field. Judging from the ore resources and Au grade of the Actosity gold field, economic potentiality of mining development seems to be low. Because of high possibility to secure new ore resources through more detailed exploration works from the Actosity area, the growth of econonic value will be expected by a mine of middle scale.