• Tuberculosis and Respiratory Diseases
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• 제47권2호
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• pp.255-258
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• 1999

Pneumoconiosis, very popular to coal miners who are exposed to coal dusts dominantly, was introduced in the 19th century to describe lung diseases consequent to the inhalation of mineral dusts. Coal workers' pneumoconiosis(CWP) colloquially called "black lung" in the United States, is a distinct pathologic entity resulting from the tissue reaction to deposits of dust include the coal macule, which associated with focal emphysema constitutes the characteristic lesion of simple CWP and complicated CWP or progressive massive fibrosis(PMF). Coal mining are also associated with chronic bronchitis, chronic airflow limitation, and/or generalized emphysema. Progressive massive fibrosis lesions may imprint on and obliterate airways and vessels, and cavitation is not uncommon, being the consequence of ischemic necrosis or mycobacterial infections. We report a case which is unusual form of progressive massive fibrosis to be differentiated from lung carcinoma. It is a rapid growing PMF with ischemic necrosis. By the studies which are about risk of having progressive massive fibroois, it is predicted to be 1.4%. And the other study shows that simple pneumoconiosis clearly predisposed to PMF, with five year attack rates of 13.9%, 12.5%, 4.4% and 0.2% among men with categories 3, 2, 1, and 0 respectively at the start of the risk periods.

• 화약ㆍ발파
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• 제24권1호
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• pp.63-69
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• 2006

터널굴착이나 사면절취 등과 같은 굴착문제에 있어서 굴착방법을 결정하기 위해 대상암반에 대한 리핑 암이나 발파암의 구분이 우선되며, 다음에 발파에 의한 굴착방법이 선정되었을지라도 화약량 및 종류, 천공방법 등 발파설계를 위해서 추가적으로 발파암에 대한 세부적인 분류가 필요하다. 일반적으로 RMR 이나 Q 시스템과 같은 암반분류법이 많이 사용되고 있지만, 발파암에 대한 표준적인 암반분류법이 없으며, 국내에서도 발파암 분류에 대한 연구가 거의 전무한 상태로 발파암의 분류요소로 사용될 수 있는 요소를 구하기 위한 연구가 필요하다, 본 논문에서는 앞으로 국내에서 발파암 분류연구에 대한 방향제시를 위해서 발파와 암석의 역학적 특성, 지질구조와 불연속면의 특성과의 관계나 굴착과 관련된 암반분류에 대한 여러 논문사례를 통하여 발파암의 분류 요소와 분류방법 등을 분석한다.

• 한국사회복지학
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• 제65권3호
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• pp.79-106
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• 2013

본 연구의 목적은 재독한인 노동이주남성의 젠더 정체성을 생애사적 사례재구성 방법에 기초해 분석하는 것이었다. 이에, 해당 남성 5명의 생애사를 재구성한 결과, 이들의 생애사를 관통하는 젠더 정체성은 '직업생활을 중시한 개인으로서의 남성' 정체성임을 발견하였다. 그리고 이러한 정체성은 직업사적 굴절이나 단절의 정도, 이주 이전의 직업과 결혼의 경험 여부에 따라 이주국의 복지를 경험하는 과정에서 연속적 혹은 비연속적으로 재생산되기도 하였고, '생계와 가사를 분담하거나 분 전담하는 남편으로서의 남성' 정체성과 결합되는 방식으로 지체적 혹은 압축적으로 분화되기도 하였음을 도출하였다. 이러한 연구결과에 의거해 사회복지와 생애사 연구에 시사하는 함의를 논의하였다.

• Journal of Preventive Medicine and Public Health
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• 제24권1호
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• pp.45-56
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• 1991

The history of occupational health in Korea s covered the era of the Republic of Korea after the Liberation from the Japanese colonialism. But the number of Korean workers exceeded about 2 millions at the times of liberation in 1945, so that it is expected that many occupational health problems inflicted Korean workers under the Japanese colonialism. The authors reviewed medical literatures, administrative documents, and other available data which were published under the colonial state, and collected things which had reference to the health status of Korean workers. The results were as follows : 1. Nutritional status of Korean workers was supposed to be inferior to that of general population, some students, and poor inhabitants in a remote mountain villages. 2. It was supposed that the constitution of Korean workers was near lower limit of average build of contemporary Koreans. 3. The accidents rate in mines was significantly high but decreasing year after year, and the most important cause of accidents was the fall of roof in the mine. The medical facilities and equipments for miners were supposed to be not sufficient in the mines and workshops. 4. Some occupational disease including silicosis, noise-induced hearing impairment, and decompression disease were known. But, overall incidence or prevalence of these diseases could not be identified. 5. On the whole, the fatalities of acute infectious diseases of Korean workers were higher than those of Japanese inhabitants in Korea and Korean inhabitants. The prevalence of pulmonary tuberculosis of Korean workers was increasing with every passing year. 6. The medical personnels and facilities were so deficient that most Korean workers were out of adequate medical use. We discussed only a part of the health status of Korean workers under the Japanese colonialism, so it would be necessary to have a better grasp of details of occupational health policy and health status in the era of afflicting.

• Geomechanics and Engineering
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• 제13권5호
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• pp.861-879
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• 2017

Coal and gas outburst is a serious dynamic disaster that occurs during coal mining and threatens the lives of coal miners. Currently, coal and gas outburst is commonly predicted using single indicator and its critical value. However, single indicator is unable to fully reflect all of the factors impacting outburst risk and has poor prediction accuracy. Therefore, a more accurate prediction method is necessary. In this work, we first analyzed on-site impacting factors and precursors of coal and gas outburst; then, we constructed a Fisher discriminant analysis (FDA) index system using the gas adsorption index of drilling cutting ${\Delta}h_2$, the drilling cutting weight S, the initial velocity of gas emission from borehole q, the thickness of soft coal h, and the maximum ratio of post-blasting gas emission peak to pre-blasting gas emission $B_{max}$; finally, we studied an FDA-based multiple indicators discriminant model of coal and gas outburst, and applied the discriminant model to predict coal and gas outburst. The results showed that the discriminant model has 100% prediction accuracy, even when some conventional indexes are lower than the warning criteria. The FDA method has a broad application prospects in coal and gas outburst prediction.

• Journal of Magnetics
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• 제18권1호
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• pp.43-49
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• 2013

A pulsed ferrite magnetic field generator (FMFG) was designed for the use in the 1000 m long through-the-earth (TTE) communication system for mining disaster situations. To miniaturize the TTE system, a ferrite core having 10,000 of permeability was used for the FMFG. Attenuation of the magnetic field intensity from the FMFG (200-turn and 0.18 m diameter) was calculated to be 89.95 dB at 1000 m depth soil having 0.1 S/m of conductivity. This attenuation was lower than 151.13 dB attenuation of 1 kHz electromagnetic wave at the same conditions. Therefore, the magnetic-field was found to be desirable as a signal carrier source for TTE communications as compared to the electromagnetic wave. The designed FMFG generates the magnetic field intensity of $1{\times}10^{-10}$ Tesla at 1000 m depth. This magnetic field is detectable by compact magnetic sensors such as flux gate or magnetic tunneling junction sensor. Therefore, the miniature FMFG TTE communication system can replace the conventional electromagnetic wave carrier type TTE system and allow reliable signal transmission between rescuer and trapped miners.

• Safety and Health at Work
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• 제1권1호
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• pp.69-79
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• 2010

Objectives: Various cytokines induced by inhalation of coal dust may mediate inflammation and lead to tissue damage or fibrosis, such as coal workers' pneumoconiosis (CWP). Methods: To investigate the relevance of serum cytokines in CWP, the levels of serum interleukin-8 (IL-8) and tumor necrosis factor-alpha (TNF-${\alpha}$) as CWP biomarkers in 110 retired coal miners (22 controls and 88 CWP subjects) were related to cross sectional findings and 1-year progressive changes of the pneumoconiosis. Progressive changes of CWP were evaluated by paired comparison of chest radiographs. Analysis by a receiver operating characteristic curve assessed the biomarker potential of each cytokine. Results: The mean serum IL-8 level was significantly higher in CWP compared to controls and IL-8 levels correlated with the degree of CWP. The median serum TNF-${\alpha}$ level was significantly higher in subjects with progressive CWP compared to subjects without CWP progression. The area under the ROC curve for IL-8 (0.70) and TNF-${\alpha}$ (0.72) for CWP identification and progression, respectively, indicated the biomarker potential of the two cytokines. Serum cutoff values of IL-8 and TNF-${\alpha}$ were 11.63 pg/mL(sensitivity, 69%; specificity, 64%) and 4.52 pg/mL (sensitivity, 67%; specificity, 79%), respectively. Conclusion: The results suggest that high levels of serum IL-8 are associated with the presence of CWP and those of serum TNF-${\alpha}$ are associated with the progression of CWP.

• 품질경영학회지
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• 제48권4호
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• pp.581-596
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• 2020

Purpose: purpose of this study was to propose the web application platform which can be to detect and discriminate various diseases and pest of tomato plant based on the large amount of disease image data observed in the facility or the open field. Methods: The deep learning algorithms uesed at the web applivation platform are consisted as the combining form of Faster R-CNN with the pre-trained convolution neural network (CNN) models such as SSD_mobilenet v1, Inception v2, Resnet50 and Resnet101 models. To evaluate the superiority of the newly proposed web application platform, we collected 850 images of four diseases such as Bacterial cankers, Late blight, Leaf miners, and Powdery mildew that occur the most frequent in tomato plants. Of these, 750 were used to learn the algorithm, and the remaining 100 images were used to evaluate the algorithm. Results: From the experiments, the deep learning algorithm combining Faster R-CNN with SSD_mobilnet v1, Inception v2, Resnet50, and Restnet101 showed detection accuracy of 31.0%, 87.7%, 84.4%, and 90.8% respectively. Finally, we constructed a web application platform that can detect and discriminate various tomato deseases using best deep learning algorithm. If farmers uploaded image captured by their digital cameras such as smart phone camera or DSLR (Digital Single Lens Reflex) camera, then they can receive an information for detection, identification and disease control about captured tomato disease through the proposed web application platform. Conclusion: Incheon Port needs to act actively paying.

• 융합보안논문지
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• 제22권1호
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• pp.121-127
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• 2022

최근 암호화폐 가격 급증과 동시에 암호화폐 채굴과 관련된 사회적인 이슈가 지속 발생하고 있다. 특히, 암호화폐는 암호연산을 통해 취득할 수 있어서 컴퓨터만 있다면 누구나 쉽게 채굴을 시도할 수 있으며, Bitcoin, Ethereum 등 주요 암호화폐들의 자산가치가 증가함에 따라 대중들의 관심은 증가하고 있다. 또한, 높은 사양의 컴퓨터를 소유하고 있는 개인이 가정이나 회사 등 다양한 장소에서 암호화폐를 채굴하는 사례가 늘어나고 있다. 일부 채굴자들은 많은 전기에너지를 소모하는 컴퓨터의 발열 문제로 가정이 아닌 회사나 공공장소 등에서 채굴하여 개인의 도덕적 문제뿐만 아니라 기업에서도 여러 가지 문제들을 발생시키고 있다. 따라서, 본 연구는 암호화폐를 채굴한 컴퓨터들의 윈도우 아티팩트를 이용하여 채굴을 시도한 흔적들에 대해서 증거를 획득하는 기술에 관해 연구한다. 이를 통해 기업의 보안 강화를 위해 내부감사에 활용할 수 있도록 기대한다.

• 한국터널지하공간학회 논문집
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• 제15권6호
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• pp.613-623
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• 2013

현재 국내 석회석광산은 개발 방식 및 특성에 따라 환경적, 사회적, 경영적 측면에서 다양한 문제 등을 내포한 채 운영되고 있다. 따라서 최근에는 이 같은 문제점들을 저감하고 지속가능한 광산개발을 위하여, 갱내채광 혹은 시설물 갱내화 등 다양한 노력이 계속되고 있다. 이러한 노력은 기존의 광산개발 공간 외에 새로운 지하대형공간의 생성을 유발하기 때문에, 작업자 및 시설물의 안전성확보를 위하여 발생 가능한 다양한 종류의 리스크에 대한 재난관리 필요성이 제기되고 있다. 본 연구에서는 지하대형공간을 구축하고 시설물을 갱내화하여 본격가동을 앞둔 석회석광업현장의 작업자들을 대상으로 설문조사를 실시하여 리스크 위험도평가 및 업무영향력분석 후 재난관리를 위한 업무우선순위를 도출하였다. 그 결과, 대상 현장의 경우 파분쇄 및 분립선별공정에서 안전수칙 불이행으로 인한 리스크에 대하여 위험도가 가장 높은 것으로 나타났다. 또한, 이 리스크에 대한 재난발생시 업무연속성 유지를 위한 영향력을 분석결과 우선적으로 갱내외의 연계작업이 원활하게 이루어지도록 해야 하는 것으로 나타났다.