• 환경생물
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• 제29권4호
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• pp.265-273
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• 2011

Bacterial diversity based on the denaturing gradient gel electrophoresis (DGGE) analysis of PCR-amplified 16S rRNA gene sequences was determined for soil samples from two abandoned mine sites and the corresponding enrichment cultures using soil sample as key inoculum. Sequencing analysis of DGGE bands obtained from both the soil samples matched mostly with sequences of uncultured and newly described organisms, or organisms recently associated with the acid mine drainage environment. However, the enrichment of soil samples in ferrous sulfate and elemental sulfur media yielded sequences that were consistent with well-known iron- and sulfur-oxidizing acidophilic bacteria. Analysis of enrichment cultures of soil samples from Dalsung mine revealed abundant ${\gamma}$-$Proteobacteria$, whereas that of Gubong mine sample displayed acidophilic groups of ${\gamma}$-$Proteobacteria$, ${\alpha}$-$Proteobacteria$, $Actinobacteria$ and $Firmicutes$. Chemical elemental analysis of the mine samples indicated that the Dalsung site contained more iron and sulfate along with other toxic components as compared with those of the Gubong site. Biogeochemistry was believed to be the primary control on the acidophilic bacterial group in the enrichment samples.

• 자원리싸이클링
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• 제15권3호
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• pp.3-19
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• 2006

본 연구에서는 우리나라 미이용 자원의 유효이용 즉, 리싸이클링의 동향을 조사하기에 앞서 다양한 자원의 전체현황을 파악하려고 노력하였다. 그러기 위해서 자원수급의 세계적인 추세를 논하였고, 우리나라와 비교 검토하기 위해서 일본의 주요금속의 머티리얼 흐름을 조사하였다. 끝으로 우리나라 금속자원, 에너지자원 및 광물자원의 수급동향을 탐색, 고찰하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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• pp.1395-1399
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• 2008

국내 토층 사면을 대상으로 강우에 의해 발생되는 침투수 거동 특성을 분석함으로써 지속적인 토층의 물성 변화 계측을 통해 산사태 예 경보시스템을 구축이 가능하다. 본 연구에서는 산사태 예 경보시스템 구축의 사전 단계로써, 국내 대표적인 지질 매질인 화강암 풍화토, 편마암 풍화토와 주문진 표준사에 대해 공극률과 체적함수비 등의 토질 물성 변화를 고려한 실내 보정실험을 수행하였다. 실험조건은 공극률, 체적함수비 변화에 대한 측정센서의 측정 정밀도 향상과 이를 통해 국내 현장토에 대한 고유 보정기법을 제시하기 위함이다. 측정센서는 각 실험 조건별 물성 변화에 따라 전압을 측정함으로써 현장토에 대한 물성치와 상호 분석이 가능하도록 하였다. 주문진 표준사 뿐만 아니라 국내 현장토인 화강암 풍화토와 편마암 풍화토에 대한 체적함수비에 대한 보정식도 함께 제시하였다.

• 자원환경지질
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• 제15권3호
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• pp.113-122
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• 1982

The surveyed Boseong river, flows from south to north crossing Boseong gun Mirukg myon, Nodong myon, Yuleo myon, Bocgnae myon, Mundeog myon, and Seungju gun Nam myon, Jeonranam do. The geology of the surveyed area consists of age-unknown composite gneiss and schist, crystaline chlorite gneiss, porphyroblastic gneiss and granite gneiss, and metasediments of Myon Bong formation and Seologri formation. These metamorphic rocks are intruded by cretaceous biotite granite, granodiorite, and quartz diorite. The heavy sands occur in Quarternary alluvium and colluvium. The composition of the river bed is sand 60%, gravel 30%, and clay 10%. The gravel content of the river bed decreases as the increases. The average depth of auger boring is 0.87 m. The average heavy mineral composition of the heavy sand is monazite 6.83%, zircon 4.88%, ilmenite 11.36%, magnetite 8.36% and garnet 4.84%. The best heavy minerals separation procedure would be primary treatment of the sand by humphrey spiral and table, and retreatment of the table concentrate by magnetic separator. The minimum economically feasible capacity of gravity and magnetic separation plant would be 500 ton/hr when only the heavy minerals are recovered but it may be reduced to 100 ton/hr. capacity, if gravels and sands are added to the valuable products.

• 한국식품영양학회지
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• 제35권5호
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• pp.295-301
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• 2022

The medicines for treating osteoporosis currently in use have minor to severe side effects, and can be financially burdensome. Thus, there is a need for prevention and alternative supplement that is relatively inexpensive, and can be easily consumed daily as an alternative dietary therapy. In this study, bone marrow density of the spine and femur of osteoporosis patients were checked before and after consuming complex composed of calcium and magnesium, considered to be the core of bone mineral content. November 2017-November 2021, patients with T-score of less than -2.5 or -1.0 < T-score < -2.5 with history of fractures or recent fractures were enrolled. The data of 60 patients who orally administered Ionized Cal/Mag^TM Complex were reviewed retrospectively, and it was significantly confirmed that the average value of T-score was up-regulated by 0.5. Additionally, the cumulative dose was observed to have a positive effect, on the improvement of BMD in the 2nd Lumbar and Femur neck. It is expected that better results will be achieved if use of the supplement is continued.

• 자원환경지질
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• 제23권2호
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• pp.161-181
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• 1990

The lead-zinc-silver-iron deposits from the Janggun mine are of hydrothermal-metasomatic origin, characterized by the marked hydrothermal alteration of the wallrocks, such as hydrothermal manganese enrichment of carbonate rocks, silicification, chloritization, sericitization, montmorillonitization and argillic alteration. The ore deposits have been emplaced within the Janggun Limestone of Cambro-Ordovician age at the immediate contacts with apophyses injected from the Chunyang Granite plutons of Late Jurrasic age. They have been structurally controlled by fractures in the carbonate rocks and the irregular intrusive contacts of granitic rocks, and are closely associated with hypogene manganese carbonate deposits. In the mine nine seperate orebodies are being mined. On the basis of the petrological study, hydrothermal alteration zone of this mine may be divided into the following four zones from wallrock to orebody. (I) Primary calcite and dolomite zone${\rightarrow}$(II) dolomitic limestone zone${\rightarrow}$(III) dolomitic zone${\rightarrow}$(IV) rhodochrosite zone${\rightarrow}$ orebody. There was not recongnized Mn and Fe elements in the primary calcite and dolomite zone. But, in the dolomitic limestone and dolomite zone, calcite and dolomite were subjected to weak hydrothermal manganese enrichment and the grade of the manganese enrichment increase oreward. By means of electron probe microanalysis, it was found that manganoan dolomite occured between primary dolomite grains, cross the cleavage of the primary dolomite and around the dolomite grains. Above these result supports that the Janggun manganese carbonate deposits are of hydrothermal metasomatic origin.

• 한국토양비료학회지
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• 제33권6호
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• pp.377-383
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• 2000

본 연구는 해수의 작용으로 운반퇴적된 해성토와 하천에 의해 집적생성된 하성토가 혼합된 삽교호 유역의 하해혼성충적토에서, 토양의 이화학적 특성과 토양광물 분포를 밝혀 토양 발달정도를 추정하고 지형적인 연관성이 토양광물 조성에 미친 영향을 구명하기위하여, 간척지 숙성화 정도가 상이한 광활통, 춘포통, 복천통, 공덕통의 논토양과 간석지 1지점에 대하여 토양 이화학적분석, 시차열분석, 열중량분석, X-선회절분석을 실시한 결과로서 다음과 같이 요약할 수 있다. 해안에 위치한 토양일수록 토양의 입경분포에서 미사와 점토함량은 증가하고, 토양산도와 치환성 Na가 높아지고 CEC는 약간 감소하는 경향을 보였으며, 공덕통이탄층의 CEC는 $65cmol^+kg^{-1}$이었다. 토양 중 모래의 주광물은 석영, 운모, 장석, 녹니석, 각섬석이었으며, 광활통과 춘포통은 운모, 복천통과 공덕통은 석영의 분포가 높았으며, 내륙에 위치하는 토양일수록 장석, 녹니석의 상대적 비율이 높아 상부 곡간지로부터 유입된 풍화퇴적물의 영향을 받은 것으로 추정된다. 공시토양 대부분의 주점토광물은 kaolinite, illite, vermiculice로 토양의 산도가 낮은 공덕통의 모재층은 hydroxy interlayered mineral이 함유되어 있었고, 점토광물의 분포는 내륙에서 해안으로 갈수록 1:1광물이 감소하고 2:1광물의 비율이 증가하는 경향이었다.

• 한국지구과학회지
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• 제27권5호
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• pp.521-527
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• 2006

CHIME 연대측정을 위한 전자현미분석(EPMA)에서는 통상적으로 핵 연료 물질 등 구하기 어렵고 관리에 민감한 표준 물질을 사용하므로 이를 구하지 못하는 실험실에서는 적용에 어려움이 있다. 이 연구에서는 이러한 표준 물질을 대신할 수 있는 새로운 실험실 표준법을 제시한다. CHIME 연대 측정이 원활하게 이루어지고 일련의 표준 물질이 잘 구비된 실험실에서 X선 세기가 균질함이 확인된 모나자이트와 같은 광물편을 대상으로 보정 상수를 정확히 구하고, Th, U 등의 특성 X선 세기를 측정해두면, 다른 실험실에서는 단지 광물편의 특성 X선 세기를 측정하는 것만으로 바로 사용할 수 있는 표준 물질로 활용할 수 있다. 이 기법은 전자 현미 분석에서 화학성분과 X선 간섭 보정 계수의 결정에 필요한 표준 물질로 모두 활용이 가능하며, 광물 표준 물질의 복잡한 화학 성분에 대해 독립적이다.

• 자원환경지질
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• 제15권4호
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• pp.221-233
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• 1982

Ssangjeon tungsten ore deposits is a complex pegmatite deposits embedded along the contact between pre-Cambrian Buncheon granite gneiss and amphibolite. This pegmatite vein developed 2 km along the strike and thickness varies from 10m to 40m. Mineral constituent of the normal pegmatite are quartz, microcline, plagioclase, muscovite, biotite, tourmaline and garnet. The vein paragenesis is complicated by repeated deposition of quartz but three distinct depositional stage can be recognized. Quartz A stage is the stage of the earliest milky white quartz deposition as a rock forming mineral of normal pegmatite. Quartz B stage is the stage of gray to dark gray quartz replace earlier formed normal pegmatite minerals. Quartz C stage is the stage of latest white translucent massive quartz replace quartz A and B. Tungsten ore minerals and other sulfide minerals were precipitated during quartz B stage. Ore minerals are ferberite and scheelite. Minor amount of molybdenite, arsenopyrite, pyrrhotite, pyrite, chalcopyrite, sphalerite, galena, pentlandite, bismuthinite, native bismuth and marcasite accompanied. Fluid inclusion in quartz A and B are gaseous inclusions and liquid inclusions are contained in quartz C as a primary inclusions. Salinity of inclusions in quartz A and B ranges from 4.5 to 9.5 wt. % and from 5.1 to 6.0 wt. % equivalent NaCl respectively. Homogenization temperature of quartz A; quartz B and quartz C ranges from 415 to $465^{\circ}C$, from 397 to $441^{\circ}C$ and from 278 to $357^{\circ}C$. $CO_2$ content of the ore fluid increased at the ends of quartz B stage.

• 한국재료학회지
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• 제12권5호
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• pp.334-340
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• 2002

$TiO_2$-coated fly ash was synthesized by dropping method of coating agent in order to get $TiO_2$ coating layer with high photocatalytic activity on the surface of coal fly ash. The properties of the $TiO_2$ coating layer such as morphology, crystal structure, crystal size and photocatalytic activity were compared with those of the $TiO_2$-coated fly ash prepared by the traditional method of precipitation. $TiCl_4$ aqueous solution was used as a titanium stock solution and $NH_4HCO_3$ was used as a precipitant. The $TiO_2$ coating layer obtained by dropping method of coating agent was more uniform than that coated by precipitation. However, the crystal of $TiO_2$ coated by dropping method of coating agent was easy to grow by heat treatment because of the small primary particle size and bulky morphology, and its photocatalytic activity was consequently lower than that of the $TiO_2$ coated by precipitation. The $TiO_2$ coating layer obtained by both methods had a crystal structure of anatase, and the temperature of phase transformation into rutile was 90$0^{\circ}C$. The minimum crystal size of $TiO_2$ for the highest photocatalytic activity was found to be about 10nm.