• Journal of the Korean GEO-environmental Society
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• v.13 no.4
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• pp.37-44
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• 2012

This study investigated on the adsorption of nonpoint pollution source using the Sand, hydroxyapatite(HAP), Zeolite and mixed culture. The adsorption of nonpoint pollution source on Sand, hydroxyapatite(HAP), Zeolite and mixed culture was investigated during a series of batch adsorption experiments. After the batch absorption experiments analysed COD, T-N, T-P on adsorption water. The experimental data was analysed using the pseudo-first-order adsorption kinetic models. Langmuir and Freundlich isotherm models were tested for their applicability. The maximum adsorbed amount $(Q_{max})$ of COD were found to be sand 0.0511mg/g, HAP 0.1905mg/g, Zeolite 1.0366mg/g and Mixed media 0.7444mg/g. The maximum adsorbed amount $(Q_{max})$ of T-N were found to be sand 0.0159mg/g, HAP 0.0537mg/g, Zeolite 0.5496mg/g and Mixed media 0.1374mg/g. The maximum adsorbed amount $(Q_{max})$ of T-P were found to be sand 0.0202mg/g, HAP 0.1342mg/g, Zeolite 0.0462mg/g and Mixed media 0.1180mg/g. As a result, the mixed media was effective to remove nonpoint pollution source.

• Microbiology and Biotechnology Letters
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• v.16 no.2
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• pp.85-91
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• 1988

Energy efficiency of bacterial cell mass and product formation from cellulose using Ruminococcus albus and Ruminococcus flavefaciens with application of available electron balance were discussed. Values of true growth yield, η$_{max}$ and η$^{max}_{th}$ and maintenance coefficient, m$_{e}$, were estimated us-ing experimental data, and the results were compared with estimates obtained from theoretical ap-proach. Experimental values were similar in magnitude to theoretical values in $Y^{max}_{ATP}$= 10.5 g cells/ mole ATP. Therefore, $Y^{max}_{ATP}$ values of Ruminococcus albus and Ruminocoecus flavefaciens were considered similar to 10.5 g cells/mole ATP.

• 한국HCI학회:학술대회논문집
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• 2008.02a
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• pp.376-379
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• 2008

This paper presents an image retrieval algorithm based on feature vector using color of histogram refinement for a faster and more efficient search in the process of content based image retrieval. First, we segment each of R, G, and B images from RGB color image and extract their respective histograms. Secondly, these histograms of individual R, G and B are divided into sixteen of bins each. Finally, we extract the maximum pixel values in each bins' histogram, which are calculated, compared and analyzed, Now, we can perform image retrieval technique using these maximum pixel value. Hence, the proposed algorithm of this paper effectively extracts features by comparing input and database images, making features from R, G and B into a feature vector table, and prove a batter searching performance than the current algorithm that uses histogram matching and ranks, only.

• Journal of the Korean Society of Tobacco Science
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• v.2 no.2
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• pp.14-19
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• 1980

The spectrophotometric determination of nictotine content with barbituric acid buffer solution was carry out. Absorption maximum for the proposed solution appeared at 505 nm and the absorbance remained stable for 15 minute at pH 4.2. Lambert-Beer law was proved to be applicable in the range of nicotine concentration of $7.5\mu{g}/ml$~$25\mu{g}/ml$. According to the analysis of nicotine contents in Burley and Flue-cured tobacco leaves by this method, the relative deviation was obtained to be 2.8% in comparision with the Griffith method.

• Journal of the Korean Chemical Society
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• v.29 no.2
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• pp.80-87
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• 1985

Radiation damage in a single crystal of ammonium sulfate caused by ${\gamma}$-irradiation at room temperature has given rise to several paramagnetic centers. Electron spin resonance (ESR) spectra of crystal are obtained with the X-band EPR spectrometer at room temperature. An intense and isotropic peak of Gaussian shape at g = 2.0036 is assigned to $SO_3^-$, which shows power saturation effects. Angular dependence of spectra is studied for the rotations about three mutually perpendicular axes a, b and c. The g-values are obtained from the relative distances between isotropic peak of $SO_3^-$ and anisotropic peak of the species. Principal $g^-$values and direction cosines were calculated by diagonalizing the 3${\times}$3 matrix whose elements are the $g^-$values for each species. From the analysis of characteristic principal $g^-$values and direction cosines for ammonium sulfate single crystal, anisotropic peaks corresponding to $SO_4^-,\;SO_2^-$ and defect structure corresponding to electron excess type are identified.

• Korean Journal of Optics and Photonics
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• v.14 no.1
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• pp.17-22
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• 2003

We experimentally measured the dependence of FWM efficiency on channel spacing for G.652, G.653, G.655 optical fiber with various dispersion values and compared the results with analytical results. Also, we investigated the dependence of XPM efficiency on channel spacing and dispersion in pump-probe experimental configuration.

• The Korean Journal of Pesticide Science
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• v.12 no.3
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• pp.277-282
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• 2008

To assess the resistance to prochloraz, $EC_{50}$ values of Fusarium isolates obtained from rice seed were investigated through the agar dilution method. $EC_{50}$ value of 36 isolates of Fusarium spp. to prochloraz ranged from 0.020 to $1.78{\mu}g\;mL^{-1}$ with an average of $0.25{\mu}g\;mL^{-1}$. According to the species of Fusarium, the average $EC_{50}$ value was fluctuated; $0.091{\mu}g\;mL^{-1}$ for F. moniliformis, $0.11{\mu}g\;mL^{-1}$ for F. proliferatum and $0.31{\mu}g\;mL^{-1}$ for F. fujikuroi. The resistant baseline was decided at $0.5{\mu}g\;mL^{-1}$ to determine if the isolate was resistant to prochloraz or not. Based on the resistant baseline, the ratio of resistant isolates was 14%. There was no correlation between the resistance to prochloraz and the pathogenicity of Fusarium spp. on rice seedlings. The resistant isolates of F. fujikuroi did not show the cross-resistance to other sterol biosynthesis inhibiting fungicides, triflumizole, hexaconazole, difenoconazole and tebuconazole.

• Journal of Korean Society of Transportation
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• v.16 no.1
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• pp.129-150
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• 1998

신호교차로에서의 효율적인 교통운영을 위해서는 비보호좌회전의 활성화가 필요하며 이를 위해서는 비보호좌회전이 허용되는 신호교차로에서의 교통운영의 정확한 분석이 가능해야한다. 본연구에서는 국내신호교차로에서의 운전자의 행태에 기초하여 USHCM의 비보호 좌회전 분석에서 요구되는 $g_f$, $g_q$, $P_L$, 의 현실적인 값을 산정하기 위한 모형이 제안되었으며 이에 기초하여 비보호좌회전 보정계수 및 용량분석 기법을 제시하였다. 본 연구의 결과는 다음과 같다. 첫째, 공용차로를 가진 비보호좌회전 신호교차로에서 주기당 좌회전교통량(LTC)이 5대까지의 범위에서 G(녹색신호시간)와 LTC를 변수로 한 $g_f$모형이 개발되었다. 둘째, $v_{olc}$와 $qr_o$를 변수로 한 $g_q$모형이 개발되었으며 제안된 모형에 의한 $g_q$값이 진주 및 광주에서의 현장관측치와 거의 일치함을 볼 수 있었다. 셋째, 1994 USHCM의 $P_L$모형이 LTC가 증가할수록 $P_L$값이 감소하는 비현실적인 모형의 구조를 가지므로 현실적인 모형의 구축을 위해 국내 현장자료에 기초하여 LTC를 변수로하여 $P_L$산정을 위한 단순화된 모형이 개발되었다. 넷째, 대향교통류를 통해 좌회전할 수 있는 유효녹색시간의 부분의 $g_u$를 산정하여 비보호좌회전 포화교통류율($S_{LT}$)에 주기 대 $g_u$의 비를 곱한 비보호좌회전 용량산정식이 제안되었다.

• Korean Journal of Food Science and Technology
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• v.33 no.4
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• pp.474-478
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• 2001

Transglutaminase(TGase) 첨가가 튀긴 어묵의 레올로지 특성에 미치는 영향이 평가되었다. 최적의 TGase 함량과 setting시간은 저온$(25^{\circ}C)$ setting에서는 0.1%와 180분이었고, 고온$(40^{\circ}C)$ setting에서는 0.3%와 80분으로 각각 결정되었다. 각각의 최적조건에서의 겔 강도는 $25^{\circ}C$에서는 TGase를 첨가한 겔이 첨가하지 않은 겔보다 최대 750(g cm)도 증가했으며, $40^{\circ}C$에서는 약 800(g cm)정도의 증가를 보여주었다. 동적 점탄성의 setting 측정 결과로부터 TGase 첨가 시료는 $25^{\circ}C$인 경우 G#과 G@ 값이 각각 1.0 kPa과 0.5 kPa 정도 증가하는 것으로 나타났으며, $40^{\circ}C$ 경우는 G#과 G@ 값이 각각 15 kPa과 2.2 kPa 정도 증가함을 보여 주었다. 동적 점탄성의 가열-냉각 측정 결과에서도 $25^{\circ}C$와 $40^{\circ}C$ setting 모두에서 G#, G@ 값이 $5{\sim}15\;kPa$ 정도 증가함을 나타났다.

• Journal of the Korean Chemical Society
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• v.57 no.6
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• pp.665-671
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• 2013

The solubilization of p-bromophenol by the micellar system of TTAB(tetradecyltrimethylammonium bromide) and the micellization of TTAB were studied by the UV-vis spectrophotometric method simultaneously. And the effects of temperature on these properties have been measured for the thermodynamic study. The results show that the ${\Delta}G_s{^o}$ and ${\Delta}H_s{^o}$ values are negative and the ${\Delta}S_s{^o}$ values are positive for the solubilization of p-bromophenol within the measured range. On the other hand, the ${\Delta}G_m{^o}$ values are negative and the ${\Delta}H_m{^o}$ and ${\Delta}S_m{^o}$ values are positive for the micellization of TTAB. The effects of additives such as n-butanol and NaCl have been studied also for both properties and the relationship between these two properties has been also studied. From the results, we can postulate the solubilization site of p-bromophenol in the micelle.