• 기술사
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• 제38권6호
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• pp.1-9
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• 2005

The Republic of Korea (South) and the Peaples Republic of Korea (North) had agreed to exploit the North Korean rich natural resources starting from the year of 2006. Through this mutual agreement DPRK shall quarantee ROK's investment in the North Korean Mines and supply mineral products for the compasation of the financial investment supported by ROK. In the area of northern part of Korea, many kind of natural resources such as Magnesite, Iron, Gold & Silver, Copper, Lead & Zinc, and Coal are plentifully deposited. In the area of southern part of Korea, however, most kind of natural resources have been exhausted and so presently major minerals such as Gold & Silver, Copper, Lead & Zinc and Coal are being imported and relying on foreign countries in whole quantity of the requirement. On the other hand Northern Part of Korea is making very slow progress in mining and exploitation owing to the lack of investment even though there are rich deposits of natural resources. And in Southern Part of Korea, they have most advanced production facilities and technologies in the world in the fields of Mineral Floatation, Steel Manufacturing, Nonferrous Metal Smelting & Refining and those plants fabrications. A combination of Southern Technologies together with Financial Support and Northern rich natural resources & Labour Power will be a most hopeful, desirable and mutually required 'South-North economic Cooperation' as the mining industries are labour intensive.

• 한국가금학회지
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• 제33권3호
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• pp.189-194
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• 2006

본 연구의 목적은 천연 미네랄 제제의 첨가가 산란계의 생산성, 난질 및 혈액과 난황 내 미네랄 함량에 미치는 영향을 알아보고자 실시하였다. 72주령 Hy-line Brown 240수를 공시하였고, 6주간 사양 시험을 실시하였다. 처리구는 1) Control(CON), 2) Control + 3% 키토산 + 0.50% 천연미네랄 제제 (M 0.5), 3) Control + 3% 키토산 + 0.10% 천연미네랄 제제 (M 1.0), 4) Control +3% 키토산 + 0.15% 천연미네랄 제제(m1.50)로 총 4 처리를 하여 처리당 10반복, 반복당 6수씩 임의 배치하였다. 산란율은 M1.5 처리구가 대조구, M1.0 처리구와 비교하여 유의적으로 높게 나타났다(P<0.05). 하지만 난중은 M0.5 처리구가 다른 처리구와 비교하여 유의적으로 높게 나타났다(P<0.05). 난각 강도는 처리구와 대조구간에 차이를 보이지 않았으나, 난각 두께는 M1.5 처리구가 대조구 및 다른 처리구와 비교하여 유의적으로 높게 나타났다(P<0.05). 난황색은 미네랄 처리구에서 첨가 수준의 증가에 따라 감소하는 경향을 보였다. Haugh unit은 대조구와 M1.0 처리구가 가장 높게 나타났다(P<0.05). 난황 내 K의 함량은 M1.5 처리구가 대조구와 비교하여 증가하였다(P<0.05). 그러나 난황 내 Ca과 Fe 함량에 있어서 처리구간의 유의적인 차이는 없었다(P<0.05). 혈액 내 Ca과 Fe 함량은 M1.5 처리구에서 대조구와 비교하여 높게 나타났다(P<0.05). 따라서 산란계에서 1.5% 천연 복합 미네랄 제제의 급여는 산란율, 난각 두께를 개선시켰고, 혈액 및 난황 내 미네랄 조성을 변화시켰다.

• 한국광물학회지
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• 제19권4호
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• pp.363-381
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• 2006

거창화강석의 품질기준 설정을 위한 정확한 광물조성을 구하기 위하여 거창지역 석산을 포함하여 포천, 익산 및 중국에서 수입된 총 39개의 화강석 시료를 대상으로 현미경 육안관찰에 의한 광물모드 분석, X-선 형광분석에 의한 CIPW 노름 계산, 그리고 X-선 회절 데이터를 이용하여 리트벨트법에 의한 광물정량분석을 각각 실시하였다. 거창화강석은 회백색 내지 암색으로 중립질의 반상조직을 가지며, 구성광물은 석영, 사장석, 알칼리장석 및 흑운모가 우세하다 광물조성을 결정하기 위해 3가지 분석방법을 비교한 결과, 노름 계산은 화강암의 광물조성을 제대로 반영한다고 보기 어려우며, 현미경 육안관찰에 의한 모드 분석보다 X-선 회절 데이터를 이용한 리트벨트 정량법이 상대적으로 정확한 광물조성을 보여주는 것으로 판단된다. Q-A-P 삼각도에 작도한 결과, 거창화강석은 전형적인 화강섬록암의 광물조성을 보여주며, 포천화강석은 몬조화강암, 익산석은 몬조화강암 내지 화강섬록암, 그리고 중국거창석은 화강섬록암의 조성을 각각 보여준다. 특히 중국거창석과 비교하여 거창화강석이 광물조성으로는 전혀 구별이 되지 않는 유사한 조성을 보여준다.

• 한국물환경학회지
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• 제32권5호
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• pp.442-449
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• 2016

The goal of this study is to provide basic data to establish a foundation for the provision of safe drinkable water. The raw water of natural mineral water was analyzed to determine the quantities of anions (F^-, Cl^-, NO_3-N^-, and SO₄^2- ) and cations (Ca²⁺, K⁺, Mg²⁺, and Na⁺) during the former and latter half of 2016. Analysis of the current quality of the raw water of natural mineral water among domestic manufacturers showed average anions contents of 0.46mg/L of fluorine, 8mg/L of chlorine ion, 1.5mg/L of nitrate nitrogen, and 12mg/L of sulfate ion. While the fluorine content was greater than the water quality criterion of 2.0mg/L at four points, the fluorine level was overall stable. The average cations contents included 21.3mg/L of calcium, 1.0mg/L of potassium, 3.4mg/L of magnesium, and 9.6mg/L of sodium. The chemical characteristics were compared among the major ions, and the results are presented in a piper diagram. The content ratio of cations was in the order of Ca²⁺> Na⁺>Mg²⁺>K⁺, whereas that of anions was in the order of SO₄^2->Cl^->NO_3-N^->F^-. While the cations were slightly scattered, the anions were generally concentrated except for at a few points. The Ca-Na-HCO₃ type was dominant overall in water sources from diorite, gneiss, and granite, while the Na-Mg-Ca-HCO₃-Cl type was dominant in basalt sources. Mineral water manufacturers source their water under various conditions, including in-hole casing, excavation depth, and contact state of bedrock; even within the same rocky area, some differences in the water quality type can occur. When the depth of the water source was taken into account, the mean anions contents of F^-, Cl^-, NO_3-N^-, and SO₄^2- were similar, with no significant differences according to depth. Of the cations, K⁺ and Na⁺ showed no significant differences across all the tubular wells, whereas Ca²⁺ and Mg²⁺ decreased in content with depth.

• 대한한의학회지
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• 제21권2호
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• pp.43-51
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• 2000

Objectives : It is well known that vegetables and fruits contain minerals, including potassium, sodium and phosphorus etc. Though most oriental herbal medications are made of natural plants, western scientists suppose that they also contain certain amounts of minerals and so are injurious to kidney disease such as chronic renal disease. However, by the reason of the limitation of western medical treatment on kidney disease, many patients depend on oriental medical treatment, which includes taking oriental herbal medicine. So, in order to find out the mineral contents in oriental herbal medicine, and to establish the oriental herbal medication's safety in kidney disease, studies were performed. Methods : In this study, we analyzed 42 oriental herbs commonly used in kidney disease by the Inductively Coupled Plasma(ICP) method. Results : 1. The potassium and sodium contents of oriental herbs were 3-10 times as much as of food. 2. The mineral contents of a daily dose of oriental herbal medicine satisfied the restriction of dietary mineral in CRF, though the amount of mineral intakes by food was considered. Conclusions : The mineral contents of oriental herbal medicine are less than the limits of mineral restriction in renal failure. The yielded results, we carefully suggest that oriental herbal medicine does not induce accumulation of minerals or damage in kidney disease patients.

• 한국환경농학회지
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• 제18권4호
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• pp.366-371
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• 1999

점토광물을 혼합한 사료를 급여하여 발생한 우분을 토양에 혼합하여 14, 18, 22, $25^{\circ}C$로 배양하면서 토양 중에서의 질소의 변화과정을 추적하였다. 사료에 혼합한 점토광물은 벤토나이트, 지올라이트, 맥반석이었는데 CEC는 Bentonite> Zeolite > Pophyry로 맥반석은 세 점토광물 중 가장 낮은 값인 12.02이었다. 점토광물을 혼합한 사료 급여후에 배출된 분의 CEC는 Bentonite, Zeolite, Porphyry급여의 경우 147.5, 137.0, 114.0cmol/㎏로 점토광물이 혼합되지 않은 일반분의 107.5cmol/㎏보다 높은 수치를 나타냈다. 분과 토양을 혼합하여 $18^{\circ}C$이상의 온도에서 배양되면 8주후에는 처리구간의 차이가 적어져서 안정화되는 것으로 나타났다. 분 배양후 $NH_4\;^+-N$ 함량은 처리구별로 차이를 크게 보이지 않은 반면에 $NO_3-N$ 함량은 Zeolite > Bentonite > Porphyry > 일반분의 순으로 나타났다. 점토광물이 혼합된 분이 처리된 토양에서 NO₃^--N의 함량이 높게 유지된 것은 점토광물에 $NH_4\;^+-N$이 흡착되어 휘산 등에 의한 손실이 줄어들었기 때문이라고 판단된다.

• 에너지공학
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• 제27권2호
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• pp.70-80
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• 2018

Natural organic matter (NOM) is among the most common pollutant in underground and surface waters. It comprises of humic substances which contains anionic macromolecules such as aliphatic and aromatic compounds of a wide range of molecular weights along with carboxylic, phenolic functional groups. Although the concentration of NOM in potable water usually lies in the range of 1-10 ppm. Conventional treatment technologies are facing challenge in removing NOM effectively. The main issues are concentrated to low efficiency, membrane fouling, and harmful by-product formation. Ion-exchangers can be considered as an efficient and economic pretreatment technology for the removal of NOM. It not only consumes less time for pretreatment but also resist formation of trihalomethanes (THMs), an unwanted harmful by-product. This article provides a comprehensive review of ion exchange processes for the removal of NOM.

• Composites Research
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• 제20권3호
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• pp.63-66
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• 2007

Structural analysis of automotive engine cover under vibration excitation is performed by finite element analysis (FEA) in order to identify the critical area of the structure. Assembly load due to the tightening of the bolts as well as the vibration excitation were considered to describe the actual loading condition. Natural frequencies of the system were extracted considering the damping effect of the structure. Dynamic analysis was performed based on the extracted natural frequency of the system. Experimental modal analysis (EMA) and measurement of strains were performed to verify the results of the analysis. Analysis results correlated closely with the experimental results. Analysis and experiments showed that contribution of the assembly load should not be ignored to predict the structural failure of the engine cover.

• 한국세라믹학회지
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• 제51권2호
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• pp.72-81
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• 2014

The main mineral phases of natural hydraulic lime (NHL) as a hydraulic lime binderare $Ca(OH)_2$, $C_2S$, $C_3S$, $C_3A$, and $SiO_2$ residues. Also, NHL has the characteristic of setting and hardening by a hydration reaction with water and by carbonation reactions with carbon dioxide from the air. In this study, in an effort to investigate changes of the mineral phases by NHL hydration and carbonation reactions, transitions of mineral phases and the microstructures of hardened pastes were analyzed by XRD, DSC, SEM, and by pore size distributions using domestic and foreign-sourced NHL pastes after curing at 1, 3, 7, and 28 days. On the basis of the analysis results, it was confirmed that domestic low-grade limestone can be used for the manufacturing of NHL. The main hydration mineral phases were $Ca(OH)_2$, $CaCO_3$, $C_2S$, and $SiO_2$ residues, while in the case of foreign-sourced NHL, a small amount of an aluminium hydration phase formed. Also, the $CaCO_3$ content after the carbonation reaction increased with an increase in the curing time. After hydration for 28 days, NHL containing considerable amounts of $C_2S$ and $C_3S$ showed higher carbonation ratios than others types.

• 자원환경지질
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• 제40권6호
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• pp.785-795
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• 2007

최근 정보의 활용환경이 특정기관에서 생산된 정보차원에서 벗어나 기관간 혹은 국가간의 정보를 통합하여 활용하고자하는 인식으로 바뀌고 있다. 특히 자연재해는 다양한 분야와 복합적으로 연계되어 있기 때문에 재해예방 및 피해저감을 위해서 관련분야와의 연계된 정보 활용이 필요하다. 이 연구에서는 정보의 통합적 활용에 대한 필요성을 바탕으로 자연재해분야의 통합정보활용방안을 마련하였다. 이를 위해 정보통합에 요구되는 관련 기술, 동향 및 사례에 대한 검토를 통해, 국내의 정보활용환경과 관련된 정보의 접근방법, 이용현황, 정보수요현황 등에 대하여 각 자연재해관련 분야별 자연재해정보의 실 사용자 및 일반인들을 대상으로 설문조사를 수행하였다. 설문 결과와 국외 분석 결과를 토대로 국내 자연재해정보의 통합적 활용방안을 제시한다.