• Photonics industry news
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• s.6
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• pp.44-47
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• 2001

닷컴기업들의 몰락, 이동 통신 분야의 투자지연,경기 하락 등에서 촉발된 통신기기 산업의 침체는 3세대 서비스 상용화에 의한 신규 투자수요 발생과 통신기기 회사들의 강도 높은 구조 조정에 의한 공급 과잉 문제가 해소된 이우에야 회복이 가능할 것으로 보인다.

• Photonics industry news
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• s.10
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• pp.36-41
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• 2002

인터넷 트래픽의 폭증, 네트워크서비스사업자(NSP)간 경쟁심화, 광기술의 발전 등에 따른 광네트워크화의 급속한 진전은 관련 기업들의 체계적인 준비와 대응을 요구하고 있다.

• Photonics industry news
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• s.9
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• pp.28-33
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• 2002

최근 중국경제의 위기 가능성을 지적하는 목소리가 커지고 있다. 중국이 여러가지 취약점을 안고 있는 것은 사실이나 이들이 경제 및 체제위기로 발전할 가능성은 높지 않다. 중국은 수출과 내수의 적절한 균형을 통해 상당기간 안정적인 성장을 지속할 수 있을것으로 보인다.

• Korean Journal of Remote Sensing
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• v.37 no.3
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• pp.531-542
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• 2021

Open-pit mines require constant monitoring as they can cause surface changes and environmental disturbances. In open-pit mines, there is little vegetation at the mining site and can be monitored using InSAR (Interferometric Synthetic Aperture Radar) coherence imageries. In this study, activities occurring in mine were analyzed by applying the recently developed InSAR coherence-based NDAI (Normalized Difference Activity Index). The March 5 Youth Mine is a North Korean mine whose development has been expanded since 2008. NDAI analysis was performed with InSAR coherence imageries obtained using Sentinel-1 SAR images taken at 12-day intervals in the March 5 Youth Mine. First, the area where the elevation decreased by about 75.24 m and increased by about 9.85 m over the 14 years from 2000 was defined as the mining site and the tailings piles. Then, the NDAI images were used for time series analysis at various time intervals. Over the entire period (2017-2019), average mining activity was relatively active at the center of the mining area. In order to find out more detailed changes in the surface activity of the mine, the time interval was reduced and the activity was observed over a 1-year period. In 2017, we analyzed changes in mining operations before and after artificial earthquakes based on seismic data and NDAI images. After the large-scale blasting that occurred on 30 April 2017, activity was detected west of the mining area. It is estimated that the size of the mining area was enlarged by two blasts on 30 September 2017. The time-averaged NDAI images used to perform detailed time-series analysis were generated over a period of 1 year and 4 months, and then composited into RGB images. Annual analysis of activity confirmed an active region in the northeast of the mining area in 2018 and found the characteristic activity of the expansion of tailings piles in 2019. Time series analysis using NDAI was able to detect random surface changes in open-pit mines that are difficult to identify with optical images. Especially in areas where in situ data is not available, remote sensing can effectively perform mining activity analysis.

• Journal of the Mineralogical Society of Korea
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• v.24 no.1
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• pp.43-53
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• 2011

Health risk assessments for the abandoned asbestos mine were usually performed with activity-based sampling (ABS) method, which was not a effective tool for indexing health risk on an exact small area of mine. A newly proposed potential index of health risk (PIHR) was applied with proper spatial determination of geographical information system (GIS) to assess quantitatively health risks. A new trial was applied to a certain abandoned mine in Boryong as follows: A high grade area of PIHR was estimated 7.8% of the whole area of the mine (about 27.3 ha). Based on US EPA IRIS (integrated risk information system) model considering lifetime excess cancer risk (LECR), the health risk assessment indicated that the high grade area increased from 3.0 ha through 12.9 ha to 19.5 ha with an increase of asbestos contents in soil from 0.36% (1E-04 level) through 0.1% (3E-05 level) to 0.04% (1E-05 level). These results can be effectively applied to determine reclamation area of the abandoned asbestos mine.

• Tunnel and Underground Space
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• v.28 no.3
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• pp.209-231
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• 2018

Severe mine disasters have continued to occur around the world. To ensure worker's health and safety and enhance the productivity, a number of studies have been conducted for the development of wireless sensor network (WSN), environmental monitoring, and communication system in underground mines. An increase in development and application of these systems has just begun with the introduction of information and communication technology into the mining industry in Korea, and yet there have been only a few studies that considered the underground mine ventilation system. This study presented the literature review on the development of WSN and environmental monitoring in underground mines, and especially, on 7 subjects in terms of underground mine ventilation. Moreover, studies that especially conducted real-time environmental monitoring were reviewed and categorized by each commercial software commonly utilized for the ventilation network analysis. For the application in domestic underground mines, further issues were discussed regarding research subjects that may be needed in the future and domestic environmental standards that has been used in the underground mine operation. This paper is expected to be useful for the development of WSN-based environmental monitoring and communication system, as well as for related studies in the future.

• Journal of the Mineralogical Society of Korea
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• v.31 no.3
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• pp.173-182
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• 2018

The precipitation and phase transformation processes of iron minerals in acid mine drainage have a great influence on the behavior of trace elements in drainage. However, it is not easy to accurately trace these processes in natural environments, and therefore, most studies have carried out in the laboratory to obtain the information on the precipitation and transformation of those minerals. In this study, the precipitation of minerals and the changes of trace elements in drainage water were investigated at different pH values in actual acid mine drainage collected from the Dalsung mine. The amount of some precipitated minerals was not enough for the mineral identification. However, from the minerals identified, amorphous minerals were formed first, and then goethite was precipitated probably from schwertmannite. When the pH of the sample was high (10), amorphous phases of minerals were still observed at even high pH (pH 10). With increasing time, the pH values decreased by precipitation and transformation of minerals. All the elements showed low concentrations at high pH (8, 10), which might be due to the precipitation of minerals at high pH and the effect of surface charge, and the concentrations of elements gradually increased with time. In the case of sulfur, it also increased in water due to the transformation of schwertmannite to goethite.

• Economic and Environmental Geology
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• v.57 no.2
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• pp.119-128
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• 2024

In Australia & Canada, architectural rock and aggregate are one of the mineral resources, and related data and information provided integrated with them. In these countries, the provided data and information, through the information system of local government and national geological survey organizations, are interactive maps, geological and thematic maps, exploration data set, 3 dimension geological models, minning rights status, survey reports and related papers etc. However, in case of Korea, aggregate and architectural rock are not assigned as the kind of mineral resources in accordance to domestic mining law, and related geological data and information are not provided from comprehensive mineral information system established in public geoscience organizations. And the administrative and informative management are conducted separately through the different governmental organizations such as Ministry of construction, Korea forest service, geoscience institute & Korea Mine & Reclamation Corporation. For securing the supply of architectural rock and aggregate resources, and for the convenience of their development & utilization, the unified information system and governance reform for the related industry is needed.

• Photonics industry news
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• s.66
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• pp.20-25
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• 2011

지식경제부에서는 2020년까지 국가전체의 LED(반도체광원)조명 보급률을 60%까지 끌어 올린다는 내용으로 최근 LED 조명 보급활성화 방안인 'LED 2060' 정책을 새롭게 내놓았다. 이는 LED가 특정 파장(색깔)의 광원을 얻는 데 유리하고 저탄소 녹색기술이면서 저전력 광원으로써, 자동차 감성조명 등 다양한 응용시장의 급성장 잠재력을 파악한 정책인 것으로 이해되며, 이와 함께 산업체, 학계, 연구소 등에서는 LED효율 증가 응용기술 확대, 신뢰성확보 등 다양한 연구개발이 시도되고 있다. 한편, 한국광기술원(김선호 원장)은 LED 칩공정, 패키징, 시스템 및 응용기술 등에 대해 활발히 연구 중에 있으며, 특히 특정파장의 LED를 농림기술개발에의 적용을 시도하여 해충방제 관련 연구를 진행하고 있다(총괄책임자 김정헌 책임연구원). LED해충방제 연구는 농림수산식품부 수출전략기술개발사업의 지원을 받아 "LED 광원을 이용한 해충방제 시스템개발" 목표로 한국광기술원(총괄), (주)링크옵틱스, 전자부품연구원, 국립식량과학원, 전남대학교 등 5개 기관이 컨소시엄을 이루어 진행하고 있으며, 주 연구 내용은 해충방제용 LED램프 개발 및 양산, 빛에 대한 해충의 행동반응 연구 등이다.

• Photonics industry news
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• s.63
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• pp.8-11
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• 2011

최근 녹색성장 및 에너지절감 등의 트렌드에 힘입어 LED조명에 대한 일반인들의 관심이 급증되고 있다. 이에 국내외 글로벌 기업들이 LED조명 관련제품을 봇물처럼 쏟아내고 있다. 광주지역 광산업체 등 중소기업들도 신제품 출시에 박차를 가하고 있다. 연구기관 및 관련 전문가들은 2010년 국내 LED조명 시장은 6,651억원 2015년에는 3조 7,000억원대에 이를 것으로 예측한다. 이는 LED가 고효율 저전력, 반영구적 수명, 공간효율성, 다양한 연출효과, 친환경적인 장점이 크기 때문이다. 그동안 기술발전에 힘입어 가로등, 건축 경관, 장식, 사인조명 뿐만 아니라 옥내에서 사용하는 할로겐, 백열전구 형광등 등도 LED조명으로 빠르게 대체되고 있다.