• 대한원격탐사학회지
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• 제25권2호
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• pp.175-184
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• 2009

본 연구에서는 변화하고 있는 지표를 파악하기 위하여 기존황사발원지인 고비사막과 새로운 황사발원지로 주목받고 있는 만주에 대한 토지피복 비교 분석을 수행하였다. 이를 위해 1999년과 2007년의 SPOT VEGETATION(VGT) 센서로부터 취득된 Normalized Difference Vegetation Index (NDVI) 10-day 자료를 사용하였다. 효율적으로 식물의 변화를 탐지하기 위해 NDVI패턴을 분석하고, 식생의 밀도에 따라 level로 분류하여 식생상태를 비교하였다. 그 결과 모든 level을 통해 황사발원지들의 동진추세를 확인할 수 있었다. 또한 기존의 황사발원지였던 고비사막과 황토고원은 positive한 변화를 보인 반면 새로운 황사발원지인 내몽골 고원과 만주는 negative한 변화를 보임을 관찰하였다. 특히 만주는 다른 황사발원지들과 다르게 사막이나 나지의 특성을 가지고 있지는 않으나 지속적으로 negative하게 변화함을 SPOT VGT의 1999년에서 2007년까지 9년 동안의 자료를 분석하여 확인하였다.

• International Journal of Industrial Entomology and Biomaterials
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• 제37권2호
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• pp.36-42
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• 2018

Recently, silk sericin has attracted attention because of its unique properties as a biomaterial, including its UV resistance, moisturizing effect on skin, and wound-healing effect. Therefore, the preparation of sericin in various forms such as gel, film, fiber, and sponge is studied for cosmetic and biomedical applications, and the effect of the preparation conditions on the structure and properties of sericin forms is examined to maximize its performance. In this study, silk sericin films were prepared under different preparation conditions and heat-treated at high temperatures ($100-250^{\circ}C$) to examine the effect of heat treatment on the film structure. The order of the crystallinity index of the untreated sericin film is as follows: F25 (sericin film cast from formic acid) > WE25 (ethanol treated sericin film cast from water at $250^{\circ}C$) > W25 (sericin film cast from water at $250^{\circ}C$) > W100 (sericin film cast from water at $100^{\circ}C$). As the heat-treatment temperature was increased, the color of the sericin films changed gradually from colorless to yellow, brown, and black depending on the temperature. The crystallinity of the sericin film changed after the heat treatment, depending on the preparation condition. Whereas a sericin film cast from formic acid (F25) started to lose its crystallinity at $200^{\circ}C$, thus undergoing the highest loss of crystallinity among the sericin films studied, the rest (W25, WE25, and W100) showed a decrease in crystallinity at $250^{\circ}C$, owing to the disruption of the ${\beta}$-sheet crystallites due to heat.

• 한국지반환경공학회 논문집
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• 제12권6호
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• pp.43-51
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• 2011

국내의 동 서 남해안에는 해성점토층이 폭넓게 분포되어 있으며, 해안지역에서 기반시설물을 설계할 때 압축성이 큰 해성점토로 구성된 연약지반의 공학적 특성을 파악하는 일은 매우 중요하다. 본 논문에서는 인천, 목포, 광양 및 부산지역 해성점토의 물리적 압축특성을 분석하여 각 지역 및 우리나라 서 남해안 점토특성을 비교하였다. 이를 위하여 114구역 1,471개 샘플의 실험결과를 이용하였다. 비교결과, 인천점토의 경우 중국 황하로부터 유입된 세립실트 및 높은 조수간만의 차로 가장 낮은 소성 및 높은 단위중량을 보였고, 광양점토는 광범위한 준설매립의 영향으로 압축성이 가장 컸다. 그와 비교할 때 목포 및 부산의 경우는 부분적으로 비슷한 수준의 특성을 나타내었다. 목포와 부산점토의 압축지수는 인천에 비하여 2배 이상, 광양점토의 경우는 목포 및 부산에 비해 70% 이상 높게 나타났다.

• Applied Biological Chemistry
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• 제43권4호
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• pp.260-265
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• 2000

고선량 감마선 조사에 의한 계란의 저장 중 품질 변화를 측정하기 위해 신선란을 $^{60}Co$를 이용하여 조사선량을 0, 1, 5, 10, 30 kGy로 하여 조사한 후 30일간 저장 실험을 수행하였다. 조사된 계란의 품질 변화는 난황계수, 난황 색깔, 난백 pH, 난백 점도, 계란 중량, 난백 단백질의 SDS-PAGE 패턴, circular dichroism(CD), fluorescence spectroscopy 등을 측정함으로써 살펴보았다. 저장기간 중 난황계수는 감마선 조사된 계란과 대조구 모두 감소하는 경향을 보였는데 선량이 증가할수록 난황계수는 감소하였고 10 kGy와 30 kGy 등 고선량으로 조사된 계란에서 난황계수가 일시적으로 증가하는 현상을 보였다. 난황 색깔은 선량이 증가함에 따라 밝은 노란색을 나타냈으나 저장 기간 동안 큰 차이는 나타나지 않았다. 난백 점도는 선량이 증가할수록 감소하였고 저장 중 점도가 감소하는 현상을 보였으며 조사된 계란의 난백 pH가 대조구에 비해 높았고 저장 중 pH는 증가를 보였다. 저장 중 난중 감소율은 증가하였고 선량별 뚜렷한 차이는 보이지 않았다. 난백 단백질의 SDS-PAGE 패턴은 조사 선량이 증가할수록 단백질의 변화가 켰는데 10 kGy 이상 고선량 조사에서는 저분자화 뿐만 아니라 고분자화 패턴도 보였다. CD와 fluorescence spectroscopy 결과 또한 감마선조사에 의한 단백질의 2차, 3차구조 변화를 보였다. 본 연구의 결과는 계란의 감마선조사에 있어 품질 유지를 위해서는 선량 범위에 있어 보다 신중을 기해야 한다는 것을 시사한다.

• 대기
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• 제25권1호
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• pp.149-154
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• 2015

As an attempt to improve fog predictability at Incheon International Airport (IIA) we couple the 3D weather forecasting model currently operational in Korea Meteorological Administration (regional Unified Model, UM_RE) with a 1D turbulence model (PAFOG). The coupling is done by extracting the meteorological data from the 3D model and properly inserting them in the PAFOG model as initial conditions and external forcing. The initial conditions include surface temperature, 2 m temperature and dew point temperature, geostrophic wind at 850 hPa and vertical profiles of temperature and dew point temperature. Moisture and temperature advections are included as external forcing and updated every hr. To validate the performance of the coupled system, simulation results of the coupled system are compared to those of the 3D model alone for the 22 sea fog cases observed over the Yellow Sea. Three statistical indices, i.e., Root Mean Square Error (RMSE), linear correlation coefficient (R) and Critical Success Index (CSI), are examined, and they all indicate that the coupled system performs better than the 3D model alone. These are certainly promising results but more improvement is required before the coupled system can actually be used as an operational fog forecasting model. For the RMSE, R, and CSI values for the coupled system are still not good enough for operational fog forecast.

• 펄프종이기술
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• 제42권2호
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• pp.82-87
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• 2010

The Hanji dyed with persimmon juice were useful goods in the past, but they are not widely used nowadays despite of their many strong points such as antibacterial and water-resistant properties. The object of this study is to provide useful data for developing new products by using them. We dyed traditional Korean hand-made papers (Hanji) with colorants extracted from fruits of Diospyros kaki and investigated the effect of various dyeing factors (mordant, mordanting method, pH of dyeing solution, light exposure time etc.) on optical and mechanical properties of the dyed Hanji. Changing mordant affected the color of dyed Hanji. The dyed Hanji after-mordanted with Cu mordant had the highest K/S value and showed the deepest yellow and red shade. The best mordanting method was an after-mordanting. The K/S value of dyed Hanji increased with decreasing pH of dyeing solution. The tensile index and size degree values of the Hanji were increased after dyeing.

• 한국세라믹학회지
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• 제55권2호
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• pp.116-125
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• 2018

Color shade variation was investigated in zirconia dental blocks, prepared using commercial powders. As a reference color-shade block we used the color indexes of A2, A3.5, A4 and B3, according to the VITA classical color scale. The zirconia powders for color shade blocks showed colors of white, yellow, pink and grey, respectively, after firing at $1530^{\circ}C$. The zirconia powders were mixed according to the recipe of color shade blocks and shaped at lower pressure using a uniaxial hydrostatic press. The shaped sample was inserted into a vinyl pack and sealed in a vacuum form machine. The shaped block samples were reshaped at 450 bar using an isostatic cold press and fired at $1530^{\circ}C$ for three hours. In order to investigate the atmospheric color variation with firing temperature, the A2, A3.5, A4 and B3 sintered blocks were fired between $700^{\circ}C$ and $1300^{\circ}C$ under controlled atmosphere of $pN_2$ and $pO_2$. The surface color picture was taken using a smart phone camera and compared with the results obtained using the VITA classical color scale. Quantitative color index value, CIELAB, was measured using a color-meter. Above $800^{\circ}C$, the color darkness greatly increased with the increase of the reduction temperature and keeping time.

• 한국수산과학회지
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• 제49권2호
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• pp.198-207
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• 2016

Tanaka’s snailfish, Liparis tanakae (Gilbert and Burke, 1912), is distributed throughout the coasts of Korea. To clarify the population structure of L. tanakae, we analyzed the morphological and genetic variation among individuals sampled from three localities surrounding the Korean peninsula: Boryeong in the Yellow Sea, Jinhae in the Korea Strait and Pohang in the East Sea. Principal component analysis based on 20 morphometric characteristics revealed two slightly distinct groups (Boryeong vs. Jinhae and Pohang). However, canonical discriminant analysis clearly revealed three groups, separated according to locality. Pairwise differentiation index (F_ST) comparisons based on 762-base pairs mitochondrial cytochrome b gene sequences showed that Boryeong significantly differed from Jinhae and Pohang, but Jinhae and Pohang did not significantly differ from each other. Our findings suggest that Korean L. tanakae comprise at least two groups. Further studies using more sensitive DNA markers, such as microsatellite DNA, are required.

• 한국의류산업학회지
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• 제6권5호
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• pp.667-672
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• 2004

Poly(ethylene terephthalate) (PET) fabrics were treated with a silica particle and phosphate flame retardant to determine the optimum process condition of the digital textile printing(DTP) media. The treating conditions for the study were 6 conditions, from F1 to F6, in which F3, F4 and F5 were treated with mixture of both silica particle and phosphate compound in process of pad, dry and cure fixation. F6 was treated with phosphate compound only and silica particle coating successively. Xanthan gum was used to control the migration of liquid phosphate compound onto PET fabrics. The change in surface morphology of fabrics treated with silica particle and phosphate compound was observed by SEM and flame retardance was evaluated by limiting oxygen index(LOI). It was observed that F6 was the excellent flame retardance and low bleeding in printing, Collectively, the printing characteristics of silica to cyan, magenta, yellow and black ink and flame retardance of fabrics finished with phosphate compound were identified in this study.

• 동의생리병리학회지
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• 제19권5호
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• pp.1437-1442
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• 2005

Tongue Diagnosis is the important traditional oriental medical diagnosis method that observes not only the general physiological state but also some kinds of disease. However, manual tongue diagnosis is much influenced by surrounding illumination. Therefore, Digital Tongue Inspection System(DigiTis) is needed for the quantification of objective tongue information, In this research, Tongue images of 98 malignant Neoplasm patients and 34 normal persons were collected by Digital Tongue Inspection System. Statistical analysis of tongue images and patient data indicates that cancer group has more blue-purple components in tongue body(舌質) and yellow components in tongue coating than normal group. Also, there are a lot of rose-pink components in the cancer group of second stage and blue-purple components in the cancer group of third or fourth stage. Our study shows that tongue image is a useful index for distinction between disease and health. Furthermore we need more extended research through the additional sampling and various disease.