• Journal of the Korean Society of Groundwater Environment
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• v.4 no.4
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• pp.169-174
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• 1997

Stream water and precipitates were analyzed for metal contents to evaluate the compositional changes of effluent water from mine waste Danbung mine located in the vicinity of Munkyung. Samples were collected before and after the rainy season in 1995 and before the rainy season in 1997 to observe seasonal variation and the charge of the status of pollution after the lapse of two years. Increased metal contents and lowered pH values after rainy season are thought of the results of flushing of oxidation products of pyrite accumulated during dry season in mine wastes. The results of two years later showed that pollution by AMD have progressed more seriously in that pH has been lowered by one order and metal contents increased about twice. The spatial distribution of various Fe, Al hydroxides and sulfates occurring as red and white precipitates also changed. Red precipitates occurred at stream bed in longer distance after two years and white precipitates occurred far down from the mine wastes where no precipitates had been observed 1995. And metal contents in sediments also increased up to more than ten times.

• The Journal of Engineering Geology
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• v.6 no.2
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• pp.65-81
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• 1996

Friar Tuck, an Abandoned Mine Lands (AML) site, is located on the Greene-Sullivan county line in southwest Indiana. Prior to the on-going reclamation, Friar Tuck was one of the Indiana's largest and most environmentally adverse abandoned mine lands. The direct vegetation method was used to reclaim tailing ponds. Grading, capping, and revegetalon using agricultural limestone, fertilizer, mulch and seed were applied to the gob piles to abate acid mine drainage (AMD) and off-side sedimentaion. Erosion control structures such as terrace, diversion ditch, and gabion structures were also constructed to minimize erosion at slopes. A new method for treatment of AMD using apatite was tested in the laboratory and field. Apatite effectively removed iron, aluminum and sulfate while maintaining an almost constant pH. Apparently, this method can be applied to control AMD from mining refuse materials, even those containing high concentrations of iron and aluminum ions.

• KSBB Journal
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• v.9 no.3
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• pp.287-293
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• 1994

A bacterium isolated from waste coal mine water around Hawsun had an ability for the degradation of hydrogen sulfide. The isolate was identified as Thiobacillus sp. IW. on the basis of its morphological, physiological and chemotaxonomical characteristics. The optimum pH and temperature were 7 and $30^{\circ}C$, respectively. Growth occurred in a pH range of 3 to 9. Due to the sulfate accumulated in liquid medium, the pH decreased. As a consequence the cell growth was inhibited. Potasium nitrate and glutamic acid were utilized as a nitrogen source but urea and ammonium chloride not consumed. Denitrification occurred in a basal medium containing the glucose but did not in a basal medium containing the malate. The maximum specific growth rate of cell was 0.78h-1 and generation time was 0.9 hour. The cell productivity was 6.25mg/1$.$h and the isolate grew logarithmically up to 18 hour. These results indicate that the isolate can be a suitable bacterium responsible for degradation of hydrogen sulfide as malodorous compounds.

• Korean Journal of Soil Science and Fertilizer
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• v.43 no.5
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• pp.546-551
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• 2010

The objectives of this study were to investigate soil chemical and microbiological characteristics in Yeongnam, Honam, Chungcheong and Kangwon for forest rehabilitation and management in abandoned coal mine areas. Average soil pH was 5.5 (4.2 ~ 8.1). Average contents of TOC, total N and available P2O5 were 1.1% (0.1 ~ 2.6%), 0.08% (0.02 ~ 0.14%) and 16.1 ppm (3.4 ~ 63.1 ppm), respectively. Average CEC was 3.4 $cmol_c\;kg^{-1}$ and total no. of bacteria1 showed $4.9{\times}10^{12}CFU\;g^{-1}$. According to areas, soil pH was the highest in Kangwon (6.1), and Yeongnam (5.7), Honam (5.3) and Chungcheong (4.7), respectively. TOC and total no. of bacteria showed no difference. Total-N was higher in order of Yeongnam (0.10%) > Chungcheong (0.08%) = Honam (0.07%) > Kangwon (0.06%), while Av. $P_2O_5$ Yeongnam (23.9 ppm) = Chungcheong (24.5 ppm) > Honam (10.9 ppm) = Kangwon (4.9 ppm). Yeongnam showed higher value in CEC (17.5 $cmol_c\;kg^{-1}$) than any other areas. Generally, soil characteristic of Yeongnam was better for vegetation growth than any other areas, while Kangwon was worse. According to elapsed time from forest rehabilitation, patterns of soil pH and CEC showed decrease according to time while TOC and total-N increased. There were no significant differences in Av. $P_2O_5$ and total no. of bacteria. Soil chemical characteristics in abandoned coal mine areas were disadvantageous for vegetation growth in comparison with general forest soils. Therefore, sustainable managements such as fertilization are necessary for good rooting and growth of vegetation.

• Proceedings of the KSRS Conference
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• 2007.03a
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• pp.296-300
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• 2007

본 연구에서는 강원도 정선지역 및 삼척지역의 폐탄광 지역에서 관측된 지반침하지역의 공간자료와 각종 지반침하 관련요인을 분석하여, 지질학적구조와 지역적 특성이 상이한 지역에서 지반침하에 직접적인 영향을 주는 공통요인을 찾아내고자 하였다. 연구지역의 지반침하 관련요인들에 대해 GIS(Geographic Information System)를 이용하여 래스터 데이터베이스를 구축하고 모든 요인을 이용하여 분석한 위험지역과 하나의 요인씩 제거하며 분석한 위험지역을 비교하는 민감도 분석 (Sensitivity analysis)을 통해 지반침하와 연관성이 높은 요인을 추출하였다. 민감도 분석은 서로 다른 두 지역에 대해 수행하여 그 결과를 비교하였으며, 갱으로부터의 수평거리，RMR(Rock Mass Rating), 지하수 심도가 지반침하에 영향을 주는 공통요인으로 분석되었다. 본 연구결과, 폐탄광지역의 지반침하에 공통적으로 영향을 끼치는 주 요인을 구할 수 있었으며, 타 지역에서 지반침하 예측시 기존 연구에서 사용한 요인들의 데이터를 전부 구하지 못하는 경우에도 최소한의 필요한 요인을 정할 수 있으며 지반침하 예측의 효율성을 높일 수 있을 것이라 기대된다.

• Journal of the KSME
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• v.31 no.7
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• pp.590-603
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• 1991

간단하게 원격 조종시스템에 관한 제반 사항을 고찰하였다. 현존하는 첨단 원격 조종 시스템의 제어방법은 양방향/힘반향 방식이며 시스템의 성능 향상을 위해서 원격 조종 시스템, 조종사, 작업 환경과의 동적 상호작용을 고려한 제어 방식에 대한 연구 및 시간지연 등에 관한 연구가 더 요구되고 있다. 그리고 현재까지 대부분의 원격조종기의 활용은 고가의 제작경비, 고중량/대규 모로 인한 성능 저하 및 이동의 어려움 등으로 인해 대단히 제한되어 있으므로 적, 경량/소규모 고성능 원격 제어기의 개발이 시급하다 하겠다. 이를 위해 구조적 설계 및 제어, 표준 요소 활 용(standard module), 인간-기계 인터페이스 등에 관한 많은 연구가 필요하다. 이러한 고성능의 원격 조종 시스템의 개발은 산업, 우주항공, 바다속 작업, 핵시설 유지, 탄광 작업, 건설 등의 각 분야에서의 활용을 통한 기여 및 작업 효율 증대로 인한 생산성 향상, FMS(flexible manufacturing system) 등에서 지대한 효과를 나타낼 것이며 이를 위해 많은 연구 및 투자가 국내에서도 이루어져야 할 것이다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1993.04a
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• pp.153-173
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• 1993

폭약은 탄광에서 석탄이나 각종 광물을 캐거나, 건설토목현장에서 암반 제거를 위해서 주로 사용되었다. 전쟁에서 군사용으로 파괴를 위한 목적으로 사용되기도 하였으나, 최근의 동서화해 분위기와 남북통일이 무르익는 시대적 조류로 볼때 더이상 파괴용으로의 사용은 제어될 것이고 이제는 평화를 위하여, 건설을 위하여, 산업발전을 위하여 더 많이 사용되어지고 응용되어질 것이다. 작금의 첨단산업의 발달과 산업의 고도화로 우리 화약 업계에도 첨단발파기술의 개발에 많은 관심과 연구.개발을 진행중이다. 첨단발파기술의 응용사례를 소개하면, 건축토목 분야에서 노후 고층빌딩 및 굴뚝의 철거, 노후 교량 및 공장시설의 철거등에 활용되고 있으며, 위락서비스 분야에서 응용으로는 불꽃놀이를 들 수 있다. 최근에는 첨단 과학 장비를 이용하여 각종 꽃불의 모양이 음악과 미술등 예술적인 기능을 기억시킨 컴퓨터를 활용하여 보다 고차원의 공예술품(공학-예술)을 만들어낸다. 아울러 각종 기공식 발파시에도 예술적 기능과 웅장함을 가미하여 그 화려함을 극치에 다다르게 한다. 그외에도 로켓트 발사추진제등의 우주 개발에의 응용, 석유시추등 해양개발에의 응용, 각종 공학 실험연구에의 응용, 폭발 가공에의 응용, 의학에의 응용, 철강산업에의 응용 등으로 그 숫자를 이제는 일일이 나열하기 힘들 정도로 광범위해졌다.

• Economic and Environmental Geology
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• v.28 no.4
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• pp.381-388
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• 1995

The petrographic, geochemical, and physical properties of the Jangseong and Chinese coals were investigated. The most common mineral matters of Jangseong coal are kaolinite, muscovite, sericite, illite, quartz and pyrophyllite. Mineral matters in Chinese coal are mainly composed of quartz, calcite, dolomite and kaolinite. Jangseong coal ash has higher content of $Al_2O_3$, $K_2O$, $TiO_2$, As, Rb and V, and lower content of CaO, MgO, $Na_2O$, $Fe_2O_3$ and $P_2O_5$ than those of Chinese coal ash. The liquid limit and the plasticity index of Jangseong coal were compared with those of Chinese coal. The result shows that the briquetting ability of Jangseong coal is a little bit better than that of Chinese coal. The briquetting ability is found to be principally dependent on the type and the content of mineral matter in coal, especially clay mineral.

• Journal of Preventive Medicine and Public Health
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• v.21 no.2 s.24
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• pp.267-270
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• 1988

The medical record of ECC and pulmonary function test of 297 cases who were dead at hospital or admitted as coal workers' pneumoconiosis were used for the study of the relationship between forced expiratory volume in one second($FEV_{1.0}$) and ECG sign of pulmonale. The incidence of T wave inversion in $V_1$ lead was significantly increased as $FEV_{1.0}$ decrease. The incidence of T wave inversion in $V_1$ lead was over the half in the group of $FEV_{1.0}$ less than 0.7l.

• Journal of Preventive Medicine and Public Health
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• v.21 no.2 s.24
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• pp.245-250
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• 1988

For the evaluation of change of FVC and $FEV_1$ after discontinuance of bronchodilator in the coal workers' pneumoconiosis patients, 17 pairs of patients were selected. They were matched by the age(${\pm}5$ y.o.) and the type of ventilatory impairment. Pulmonary function was measured 2 times bimonthly before and after the drug discontinuance discontinued after measurement of PFT for 2 times. In case group the bronchodilator was discontinued after measurement of PFT for 2 times. In control group there was no interruption of medication. FVC, $FEV_1$ decreased in both group as measurement progress. Simple linear regression coefficients against the month of measurement were calculated in both group and tested for parallelism between two groups. The results of test revealed that both regression coefficients were parallel. So in conclusively, discontinuance of medication of bronchodilator for coal workers pneumoconiosis patients has no effect on the decreasing rate of FVC, $FEV_1$.