• Korean Journal of Food Science and Technology
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• v.44 no.1
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• pp.28-33
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• 2012

The effect of puffing conditions on the physical properties and sensory evaluations of a puffed snack (ppeongtuigi) made of purple sweet potato flour was investigated. The snacks consisted of coated artificial rice with purple sweet potato flour with water, tempered to 7%, 9% and 11% moisture. The coated material was puffed at 236, 241, or $246^{\circ}C$ for 4, 5, or 6 s. The $L^*$ value decreased as the heating time increased. The $a^*$ and $b^*$ values, specific volume, and hardness increased with increasing heating temperature and heating time. Puffed snacks produced under conditions of higher moisture (7%), higher heating temperature ($246^{\circ}C$), or longer heating time (5 s) showed high scores for appearance, color, taste, and overall acceptability in sensory evaluations.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.146-146
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• 2015

하천관리는 직접유출과 기저유출로 구성된 하천유량의 특성을 이해하는 것으로부터 시작된다. 따라서 직접유출과 기저유출의 특성은 직접적으로 하천유량의 변동성으로 전달된다. 이러한 점을 고려했을 때 전략적인 하천관리를 위해서는 직접유출/기저유출과 하천유량의 관계를 분석하는 것이 필요하다. 이를 대해 본 연구의 목적은 하천유량의 변동성과 기저유출비(Baseflow Index, BFI)의 관계를 분석하고, 이러한 관계를 일관성 있게 나타낼 수 있는 하천유량 변동성 지표(Streamflow Variability Index, SVI)를 제시하는 것이다. 본 목적을 달성하기 위해 국내 총 91개 유량관측소를 대상으로 유황계수, R-B Index(Richards-Baker Flashiness Index), 변동계수(Coefficient of Variation), Q5:Q95 ratio 등의 SVI를 적용하였다. 이와 더불어, BFI를 산정하기 위하여 기저유출 분리 모형인 WHAT, PART, HYSEP, BFLOW를 사용하였다. 연구결과는 BFI값이 증가 할수록 SVI의 값은 감소하는 경향을 나타냈다. 다양한 SVI 가운데 BFI에 대한 R-B Index의 평균 결정계수가 0.66로 가장 큰 값을 나타냈으며, 특히 WHAT 모델의 Local Minimum Method(LMM)과의 결정계수가 0.82로 가장 밀접한 관계를 나타냈다. 변동계수 또한 평균 결정계수 값이 0.60으로 높은 값을 보였다. 그 외 유황계수와 Q5:Q95의 평균 결정계수는 각각 0.04와 0.07로 매우 낮은 값을 보였다. 결론적으로 다양한 SVI 가운데 R-B Index가 여러 기저유출 방법으로 산정된 BFI 값들에 대하여 가장 일관성 있는 결과를 보였다. 본 연구의 결과는 하천의 생태적 기능 유지와 치수안정성을 확보를 고려한 하천관리에 기여할 것이다.

• Journal of Life Science
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• v.26 no.12
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• pp.1392-1399
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• 2016

Jaspine B is an anhydrophytosphingosine that is isolated from a marine sponge. Because of its structural similarity to sphingosine, it shows anti-cancer effects in human carcinomas. Therefore, this study aims to investigate its anti-proliferative effect on various cancer cells and to correlate its association with the intracellular accumulation of Jaspine B in relevant cancer cells. The anti-proliferative effect of Jaspine B in various cancer cells was determined by a cell viability test, and the intracellular concentration of Jaspine B in relevant cancer cells was determined using mass spectrometry coupled with liquid chromatography. The correlation coefficient and p value between the cytotoxicity and the cell accumulation of Jaspine B were determined using SPSS 16.1. The cytotoxicity of Jaspine B varied depending on the type of cancer cell when compared the $EC_{50}$ values of Jaspine B. Breast and melanoma cancer cells were susceptible to Jaspine B, whereas renal carcinoma cells were resistant. The intracellular concentrations of Jaspine B had a reciprocal correlation with the $EC_{50}$ values in the same cells (r = 0.838). The results suggested that the anti-proliferative effect of Jaspine B was associated with the cellular accumulation of this compound. However, Jaspine B was not a substrate for P-glycoprotein and breast cancer resistance protein, as major efflux pumps caused multidrug resistance. The maintenance of a high intracellular concentration is crucial for the cytotoxic effect of Jaspine B; however, efflux pumps may not be a controlling factor for Jaspine B-related resistance in cancer cells.

• Tunnel and Underground Space
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• v.24 no.5
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• pp.366-372
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• 2014

The generalized Hoek-Brown (H-B) function provides a unique failure condition for a jointed rock mass, in which the strength parameters of rock mass are deduced from the intact values by use of the GSI value. Since it is actually the only failure criterion which accounts for the rock mass conditions in a systematic manner, the generalized H-B criterion finds many applications to the various rock engineering projects. Its nonlinear character, however, limits more active usage of this criterion. Accordingly, many attempts have been made to understand the generalized H-B condition in the framework of the M-C function. This study presents the closed-form expression relating the tangential cohesion to the tangential friction angle, which is derived by the non-dimensional stress transformation of the generalized H-B criterion. By use of the derived equation, it is investigated how the relationship between the tangential cohesion and friction angle of the generalized H-B criterion varies with the quality of rock masses. When only the variation of GSI value is considered, it is found that the tangential friction angle decreases with the increase of GSI, while the tangential cohesion increases with GSI value.

• Korean Journal of Soil Science and Fertilizer
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• v.35 no.2
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• pp.77-86
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• 2002

Soil color characteristics were measured by a optical instrument, colorimeter, comparing with the conventional Munsell color chart and related to the chemical properties of soils. Total of the 67 experimental soils were taken from tobacco fields that located at Cheongwon, Enmseong, Boeun, Goesan, Jincheon, and Chungju countries in Chungbuk Province having the 29 soil series including Samgag. The values of L, a, and b measured by colorimeter were closely related with hue, value, and chroma of Munsell color chart, respectively, indicating the quantitative measurement of soil color characteristics. The standard deviations in measurement for L, a, and b values was smaller in soil sample passed by 0.5 mm sieve than 2 mm sieve, suggesting that soil particle size less than 0.5 mm was better condition for colorimeter measurement. The values of L and b measured by colorimeter showed a tendency to decrease as increase of soil moisture content but nearly on difference with moisture condition for the value of a. However, correlation coefficient between air dry samples and wet soil samples(soil moisture retension of -10 hPa) for measurements of L, a and b value were more than 0.9 showing the same tendency in measurement. Consequently, air dry soil passed by 0.5 mm sieve was recommended to desirable conditions for stable measurement by colorimeter. The measured values by colorimeter were significantly correlated with organic matter, CEC, exchangeable Ca and Mg, showing the highest correlation coefficient between L value and organic matter.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.47 no.3
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• pp.263-267
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• 2002

This experiment was conducted to find out the varietal differences in the relationships of chlorophyll and nitrogen concentration with leaf greenness value (SPAD value). We used two rice varieties with different leaf color type: Hwaseongbyeo has pale green leaves, and Gwanganbyeo has dark green leaves. SPAD value was correlated with chlorophyll a concentration significantly in both varieties, but not with chlorophyll b in Hwaseongbyeo. The correlation coefficients between SPAD value and nitrogen concentration of rice flag leaves were highly significant. However, the regression analysis between SPAD value and nitrogen concentration of rice flag leaves showed different relation among varieties. The slope of the regression line in Gwanganbyeo was steeper than that in Hwaseongbyeo. In conclusion, SPAD value can be applied to estimate the chlorophyll a concentration without consideration of varietal differences. Chlorophyll b and nitrogen concentration in the leaf were regressed to the SPAD values differently with varieties. This implies that the SPAD value can not be used directly to estimate chlorophyll b and nitrogen concentration without consideration of varietal differences.

• Journal of the Korea Institute of Building Construction
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• v.18 no.1
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• pp.1-7
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• 2018

This work aims to suggest the most proper Hwangtoh color(ocher) for sidewalks and walkways located at the central part of the city. The actual colors of Hwangtoh samples that were obtained from 3 different locations (mountain walkways) in Busan were measured. In addition, personal preferences of such Hwangtoh colors were evaluated through survey in order to provide a proper standard reference color for urban walkways and sidewalks. With respect to the chromaticity of Hwangtoh obtained in Busan, $a^*$ and $b^*$ values were found to range from 3.6 to 13.6 and 11.4 to 23.4, respectively. It was also found that $L^*$ (lightness) values of 3 different Hwangtoh samples were found to be similar. According to the results from survey, higher values of $+a^*$ (red type) and $+b^*$ (yellow type) were preferred, indicating the red and yellow color needs to be developed stronger from Hwangtoh. Based on these findings, the proper Hwangtoh color used for walkways in urban area was chosen. It was found to be $L^*$ for 32.2~45.8, $a^*$ for 5.2~13.6, and $b^*$ for 15.8~21.2, respectively.

• Proceedings of the Acoustical Society of Korea Conference
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• 1985.10a
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• pp.50-53
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• 1985

한국연안에서 높게 보고되고 있는 수중소음의 소음원규명을 위하여 일차적으로 해상교통량에 그 초점을 맞추었다. 100Hz 부근의 소음은 이미 잘 알려진대로 선박에 기인함이 실험결과에서도 드러났지만, Wenz의 천해수중소음 모델 중 heavy shipping때보다 10-20dB 높게 관측되었다. 200Hz 이상에서의 소음은 선박분포에 따른 평균소음값에 큰 차이를 보이지 않았지만, 선박들의 거리 변화율이 심한 근거리에 다수의 선박이 분포해 있을 경우는 10분간격의 소음값이, 특히 1KHz 이상에서 최고 10dB까지 변화를 보였다. 이것은 이 주파수대역에서 연근해의 밀집해 있는 선박들이 하나의 소음원으로서의 역할을 함을 의미한다.

• Korean Journal of Optics and Photonics
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• v.4 no.4
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• pp.487-492
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• 1993

A polarization maintaining fiber optic gyroscope was constructed having an optical loss of about 25 dB. Using the earth rotation rate as a reference, the long term stability of better than $3^{\circ}/hr$ and the rms short term noise of $0.6^{\circ}/hr/{\sqrt{Hz}}$ were obtained.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1998.03a
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• pp.145-148
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• 1998

본 논문은 뉴스 비디오 데이터베이스를 구축하기 위한 장면 분할 기법 중 Color Histogram에서 각각의 RGB를 따로 계산하여 차이값을 세부화하는 장점과, x2 Histogram에서 차이값을 강조하는 장점을 이용하여 NTSC표준에 따른 가중치를 적용한 새로운 장면 분할 방법을 제안하였다. 제안 알고리즘의 성능 평가를 위한 실험 도메인은 국내 KBS, MBC, SBS 방송의 뉴스 비디오와 국외 CNN, NHK의 뉴스 비디오를 택하였다. 주어진 환경내에서 제안한 방법을 기존의 Color Histogram, x2 Histogram, 그리고 Bin to bin difference (B2B)과의 실험결과와 비교하여 효율적임을 보였으며, 임계치의 자동선택 가능성을 제시 하였다.