• 보건의료산업학회지
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• 제11권4호
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• pp.145-155
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• 2017

Objectives : To investigate the factors affecting bone mineral density in across stratified postmenopausal ages. Methods : Data from 1,698 subjects who completed the 2010-2011 National Health and Nutrition Survey were analyzed using SPSS Statistics 21.0 The $x^2$ test and one way (ANOVA) were used to verify the relationship between general characteristics and health behaviors and the prevalence of osteoporosis. Logistic regression analysis was used to verify the factors Influencing bone mineral density. Results : The bone mineral density distribution was the highest among those with osteopenia, with proportions of 21.8% in healthy subjects, 58.1% in osteopenia, and 20.0% in those with osteoporosis. The distribution of osteoporosis by age group was 5.2% among subjects in their 50s, 15.4% among those in their 60s, and 42.4% among those in their 70s. In multivariate logistic regression analysis, the prevalence of osteoporosis according to ages was significantly correlated with age, educational level, body mass index(BMI), and parity 4 of more than 1-2 babies. Conclusions : Although age is an uncontrollable factor in the prevention of osteoporosis, educational level and BMI are correctable factors to maintain bone mineral density. There is a need to maintain healthy BMI and expand osteoporosis prevention education.

• Journal of Ceramic Processing Research
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• 제19권5호
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• pp.428-433
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• 2018

In this study, using the pilot plant activation system, the activated cement has been manufactured and then applied to the manufacturing process of mineral hydrate insulating material. The fineness of the activated cement is controlled at $5,000cm^2/g$ and $7,500cm^2/g$ and the features of mineral hydrate insulating material, using OPC and the activated cement for each degree of fineness, has been analyzed. As the result of analyzing the crystal habit of the manufactured mineral hydrate insulting material, it is analyzed that the main crystal phase of specimen is tobermorite and some quartz peak has been detected. As the degree of fineness of the activated cement increases, the height of bubble of slurry increases as well, whereas the tendency for the density character to decrease has been detected. Along with it, as the density character decreases, the compression strength has decreases, whereas the tendency for the thermal characteristic to increases has been detected. The main features of mineral hydrate insulating material, using the activated cement with the fineness of $7,500cm^2/g$, the compression strength of 0.36 MPa, and the thermal conductivity of $0.044W/m{\cdot}K$, presents the excellent features as insulation.

• Geomechanics and Engineering
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• 제37권3호
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• pp.279-291
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• 2024

The "Korea Institute of Geoscience and Mineral (KIGAM) Quake" is a web-based open platform developed for publicly serving seismological data from 61 stations operated by KIGAM in Korea. The service provides meta-information related to observatory sites, sensors, and recorders necessary for utilizing the seismological data, as well as mainly observed continuous and strong-motion waveforms. The data is available through both the web and International Federation of Digital Seismograph Networks (FDSN) web services (open API), a unified data-providing interface in seismology. The platform aims to strengthen its open nature by offering a signal processing function for strong ground motions that can be controlled by user requests. The processed results can be downloaded in ASCII format, designed to meet the increased demands and accessibility in the earthquake engineering field. The platform also offers earthquake research information produced by KIGAM, such as recent major earthquake source information and academic annual report of earthquakes. Additionally, a site flat file was constructed for the geotechnical characteristics of 61 KIGAM station (KGNET) sites based on direct investigations and estimations.

• 한국군사과학기술학회지
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• 제27권3호
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• pp.338-345
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• 2024

Magnetic anomaly signals from the ferromagnetic targets such as ships in the sea are measured by drone-based magnetic anomaly detection. A quantum magnetometer is suspended from the drone by 4 strings. Flight altitude and speed of drone are 100 m and 5 m/s, respectively. We obtain magnetic anomaly signals of few nT from the ships clearly. We analyze the signal characteristics by the ferromagnetic target through simulation using COMSOL multiphysics.

• 광물과 암석
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• 제33권2호
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• pp.129-141
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• 2020

모곡변성대는 과거 루비 광산들이 분포하던 지역으로, 주로 시생대 결정질암으로 구성된 고원지대이며, 보석류가 충적층에서 확인되어 표사광상을 이루고 있다고 미얀마지질조사광물탐사국의 미발간보고서에 수록되어있다. 루비와 함께 확인되는 광물로는 첨정석, 석류석, 홍전기석 등이 있다. 보석이 발견되는 충적층을 이루는 자갈류는 주로 편마암 및 페그마타이트 쇄설물로 구성되어있다. 특히 신구, 모곡, 모메익 지역에는 보석을 함유하는 다수의 페그마타이트가 모곡변성암류, 섬록암 및 화강암 등을 관입하여 분포한다. 신구 페그마타이트에서는 보석으로서 홍전기석, 고세나이트, 청인회석 및 자주 인회색이 산출된다. 모메익 페그마타이트에서는 보석으로서 버섯형 홍전기석, 페타라이트, 햄버어자이트, 폴류사이트 및 아쿠아마린이 산출된다. 모곡 페그마타이트에서는 보석으로서 황옥, 아쿠아마린, 고세나이트 및 허더라이트가 산출된다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제23권2호
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• pp.23-29
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• 2018

This study explored secondary effects of the residual hydrofluoric acid (HF) after a hypothetical acid spill accident by investigating the long-term dissolution of minerals and leaching of pre-existing arsenic (As) from two soil samples (i.e., KBS and KBM) through batch and column experiments. An increase in the HF concentration in both soil samples resulted in a dramatic increase in the release of major cations, especially Si. However, the amounts of mineral dissolved were dependent on the soil type and mineral characteristics. Compared to the KBM soil, relatively more Ca, Mg and Si were dissolved from the KBS soil. The column experiment showed that the long-term dissolution rates of the minerals are closely associated with the acid buffering capacity of the two soils. The KBM soil had relatively higher effluent pH values compared to the KBS soil. Also, more As was leached from the KBM soil, with a more amorphous hydrous oxide-bound As fraction. These results suggest that the potential of heavy metal leaching by the residual acid after an acid spill will be influenced by heavy metal speciation and mineral structure in the affected soil.

• 자원환경지질
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• 제53권6호
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• pp.743-753
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• 2020

본 연구는 폐석탄광산인 옥동탄광 하류에 위치한 밭토양과 논토양을 대상으로 중금속함량, 광물조성, 분광특성을 고찰하였다. X선 형광분석 결과 밭토양과 논토양 모두 비소가 토양환경오염 우려기준을 초과하여 검출되었으며 밭토양이 논토양보다 중금속오염지수가 상대적으로 높은 것을 확인하였다. X선 회절분석 결과 밭토양과 논토양 모두에서 석영, 방해석, 고령토, 일라이트, 스멕타이트, 자철석 그리고 적철석 광물이 검출되었다. 또한 유기물 분석을 실시한 결과 밭토양의 유기물 함량 변이가 더 큰 것으로 나타났다. 분광분석 결과 밭토양과 논토양의 전체적인 반사도 곡선의 양상과 흡광특성은 유사하게 발현됨을 확인하였다. 490nm 부근과 900nm 부근에서 토양 내 산화철에 의해, 1410nm, 1910nm 부근과 2200nm 부근에서 점토광물인 고령토와 스멕타이트군에 의한 흡광특성이 두드러지게 나타났으며 유기물의 함량이 많을수록 반사도가 감소하였다. 흡광 깊이는 밭토양과 논토양 모두 흡광특성이 발현되는 곳에서 오염 지수가 높아짐에 따라 흡광깊이는 얕아졌으며, 유기물 함량이 증가함에 따라 490nm 부근과 1916nm 부근의 흡광깊이가 얕아지는 경향을 보였다.

• 한국치위생학회지
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• 제10권6호
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• pp.1121-1128
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• 2010

Objective : This study was to survey the differences of bone mineral density and oral health-related characteristics according to smoking status. Methods : The data for this study were collected by Oral health-related questionnaire and BMD measurements of 20s adults(205) who were using gym in D college areas from July 5th to 9th, 2010. Results : 1. There were a significant difference of 65.4 % of male in smoker group, 59.8% of women in non smoker group(p=0.000). 2. There were a significant difference in subjective oral symptoms among yellow teeth(p=0.000). 3. There were no difference in the T-score of DMB according to smoking. Conclusion : According to the study on smoking, only subjective oral symptoms were shown while the differences at bone mineral density were insignificant. Above findings suggest that further study about the expanding the number and ages of the subjects, smoking, BMD, and oral health related studies is necessary.

• 조명전기설비학회논문지
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• 제28권6호
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• pp.52-59
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• 2014

This paper deals with the effect of decomposition products which occur in breakdown of mineral oil, on the insulation characteristics of its oil. Breakdown tests in the oil were conducted by the proposed experimental methods under a quasi-uniform field and AC HV (60Hz). The breakdown voltage in the oil shows characteristics of dispersion from successive breakdowns and, it is found that there are three patterns of the decomposition products behavior at the process of breakdown progress in the oil. Finally, the breakdown voltage dispersion in the oil can be described in detail based on the behavior patterns of the decomposition products and its diffusion time.

• 한국지하수토양환경학회지:지하수토양환경
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• 제24권1호
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• pp.1-9
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• 2019

This study presents a technical perspective to the fate characteristics of phenol and m-cresol, which represent some of the most common organic chemicals found in chemical spill accidents, and likely to persist in soil and groundwater due to their highly stable physicochemical properties. Some cases of domestic and foreign chemical accidents linked to phenol and m-cresol contamination were compiled. Due to their low organic carbon-water partitioning coefficient (Koc), phenol and m-cresol tend to migrate into groundwater and remained as dissolved phase. On the other hands, phenol and m-cresol can be readily decomposed by microbes in soil and groundwater under appropriate conditions. Therefore, the fate characteristics of these chemicals are highly contingent on environmental conditions. Thus, if a great quantity of leakage is occurred by chemical accidents, the up-to-date and correct information about fate characteristics taking into account both the chemical and environmental conditions is greatly needed to minimized the potential hazards from these chemicals.