• 분석과학
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• 제12권3호
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• pp.177-183
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• 1999

사용후 U-Al 핵연료 용해용액의 자유산 농도 측정에 이용할 수 있는 Gran plot적정법을 개발하였다. 질산을 염기로 적정할 때 미치는 U(VI)과 Al(III)의 영향을 옥살산칼륨 착화제가 함유된 적정매질과 함유되지 않은 적정매질에서 조사하였다. Gran plot방법으로 종말점을 구할 경우 두 가지 매질에서 모두 양의 오차가 있었으며, 착화제가 함유된 매질에서는 U(VI)이 그리고 착화제가 없는 매질에서는 Al(III)이 오차의 원인이었다. 옥살산칼륨 적정매질에 첨가하는 시료량을 조절하여 pH 5.0 이하에서 적정을 시작함으로써 오차를 줄일 수 있었으며, 질산 농도가 0.1 M이고 U(VI) : Al(III) : $H^+$의 몰비율이 2:12:1인 시료의 질산 농도 측정오차는 1%이하였다. 이 방법으로 U:Al의 몰비율이 1:6인 하나로핵연료 용해용액의 질산 농도를 정확하게 측정할 수 있었다.

• Applied Biological Chemistry
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• 제4권
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• pp.29-32
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• 1963

콩발아시(發芽時)에 Urea, Sucrose, Gibb 및 이들 혼합액(混合液)을 살포(撒布)하여 성분변화(成分變化)를 보았다. 1) Gibb의 신장(伸長)에 미치는 영향(影響)은 살포(撒布) 2일후(日後)에는 현저하게 나타나며 Gibb구(區) U+S+G구(區) 5일(日)째 것은 대조구(對照區) 7일(日)째것과 비슷하였다. 2) Gibb구(區) U+S+G구(區)가 모두 중량(重量)이 커진것은 다른 작물(作物)에서와 같았으며 Gibb구(區) U+S+G구(區) 5일(日)째것은 7일(日)째것과 같았다. 3) Vit.C 함량(含量)은 살포(撒布) 2일 까지는 처리구(處理區)와 대조구(對照區)사이의 차(差)가 작았으나 4일후(日後)에는 특히 Gibb에서 현저히 나타나며 Gibb에 Urea 및 Sucrose을 혼용(混用)하면 함량(含量)이 오히려 적어진다. 4) Amino태(態) N양(量)은 대조구(對照區)에 비(比)해 Urea구(區) Gibb구(區) U+S구(區)에 많았으며 이는 발아시(發芽時)에 비단백태(非蛋白態)N의 증가(增加)를 의미(意味)한다. 5) 조지방량(組脂肪量)은 처리구(處理區)가 대조구(對照區)보다 $1.6{\sim}5.8%$적으며 조단백질(組蛋白質)은 어느 처리구(處理區)나 대조구(對照區)에 비(比)해 적었으나 U+S+G구(區)만이 많았다. 환원당(還元糖)과 자당(蔗糖)을 처리구(處理區)에서 함량(含量)이 많았으며 특(特)히 U+S+G구(區)는 대조구(對照區)의 거의 배량(倍量)이었다. 6) 콩은 휴면기(休眠期)가 없으니 콩을 Gibb. 또는 U+S+G 액(液)에 침지(浸漬)하지 않고 발아직후(發芽直後)에 살포방법(撒布方法)으로도 결과(結果)를 볼수 있었다. 7) 콩나물에 Gibb.을 사용(使用)하는 것이 신장중량(伸長重量) 및 일부성분(一部成分)이 증가(增加)됨으로 유리(有利)하나 단용(單用)하는 것보다는 Gibb. Urea 및 Sucrose을 혼용(混用)하는 것이 Vit. C양(量)은 환원형(還元型) C.는 1/3 종(縱) Vit.C는 1/2량(量)이나 신장도(伸長度) 및 조지방(組脂肪)은 거이 동일(同一)하며 중량(重量)은 거이 배량(倍量)이고 단백질(蛋白質), 환원당(還元糖), 자당(蔗糖)은 침지7일후(浸漬7日後)에 각각(各各) 10.4, 36.1, 70.5% 많았다.

• 한국환경복원기술학회지
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• 제18권3호
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• pp.1-11
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• 2015

This research was conducted to compare the effect of soil amendment and loess on physial and chemical properties of dredged soil and primary height growth of Ulmus davidiana var. japonica. Three types of research plots: control plot (Dredged soil only), DC treatment plot (Dredged soil + soil amendment) and DCL treatment plot (Dredged soil + soil amendment + Loess) were set at Okgu research site in Saemanguem. 32 trees of U. davidiana var. japonica were planted in each plots after 14 months from the construction. Soil texture, pH, electrical conductivity (EC), organic matter (OM), total nitrogen (TN), available P, exchangeable cation ($K^+$, $Na^+$, $Mg^{2+}$, $Ca^{2+}$) and sodium chloride were measured after 3 years from the construction. Also, survival rate and height of U. davidiana var. japonica were measured 22 months after planting, and the correlation between height of trees and the physico-chemical properties of soil were analyzed. Even though pH in both DC and DCL treatment plots are lower than control plot, they are still alkaline (> pH 8). OM, TN and available P in both DC and DCL treatment were higher than the control. Particularly, the content of available P in both DC and DCL treatment plots are 1.4~5.1 times and 2.0~3.1 times higher than the control respectively. The concentration of exchangeable Mg in DCL treatment plot was 1.1~5.5 times higher than the control (p < .05). The survival rate of the species was the highest in DCL treatment plot (98%) followed by DC treatment plot and the control. The average height of the trees in both DC and DCL treatment plots is 1.1m while the control is 0.8m. OM, TN, available P, K+ were significantly related to the height of U. davidiana var. japonica(p < .01). The results indicate that soil amendment affects on soil physial and chemical properties of dredged soil and height growth of U. davidiana var. japonica.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1998년도 춘계 학술대회지
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• pp.29-30
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• 1998

• Bulletin of the Korean Chemical Society
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• 제20권1호
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• pp.59-64
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• 1999

Based on the study of hydrolysis behaviour of U(Ⅵ) ion and major fission product metal ions such as Cs(Ⅰ), Ce(Ⅲ), Nd(Ⅲ), Mo(Ⅵ), Ru(Ⅱ), and ZR(Ⅳ) in the titration media, the performance of noncomplexing-alkalimetric titration method for the determination of free acid in the presence of these metal ions was investigated and its results were compared to those from the completing methods. The free acidities could be determined as low as 0.05 meq in uranium solutions in which the molar ratio of U(Ⅵ)/H+ was less than 5, when the end-point of titration was estimated by Gran plot. The biases in the determinations were less than 1% and about +3% respectively for 0.4 meq and 0.05 meq of free acid at the U(Vl)/H+ molar ratio of up to 5. Applicability of this method to the determination of free acid in spent fuel solutions was confirmed by the analysis of nitric acid content in simulated spent fuel solutions and in a real spent fuel solution.

• KSBB Journal
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• 제13권1호
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• pp.44-51
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• 1998

Hydrolysis and adsorption reversibility experiments were run for initial enzyme activity of 4.48, 9.65, 11.19 and 17.14U/mL at a temperature 30$^\circ C$. The chitin particle size corresponded to a mean particle diameter of 0.127mm, and the initial concentration of chitin was 10mg/mL. After approximately 2hrs, the enzyme activity remained constant in a speudo-steady state. The amounts in the bulk [E] and the amounts of enzyme adsorbed on the chitin surface [E] are plotted on Lineweaver-Burk plot to yield a linear relationship with a correlation coefficient of 0.99, a slope of 2.79cm$^-1$ and an intercept of 0.08$\textrm{cm}^2$/U. From this parameters, the values of [E$_T$] and $K_E$ were calculated to be 12.5U/cm$^2$ and 34.88U/mL. respectively, Adsorption isotherm of the enzyme on the particles showed a well developed plateau of 1.35$\times$10$^-3$, 4.72$\times$10$^-3$, 4.42$\times$10$^-3$, 8.58$\times$10$^-3$U/cm$^2$ at 30$^\circ C$. To determine the specificity of chitinase for crystalline chitin, the free energy of adsorption was measured, and its was determined as about -14.62~-18.8kJ/mol.

• Journal of Forest and Environmental Science
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• 제24권3호
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• pp.127-135
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• 2008

The mission of the Forest Inventory and Analyis (FIA) program of the Forest Service, U.S. Department of Agriculture, is to conduct the national forest inventory of the United States of America for purposes of estimating the area of forest land; the volume, growth, and removal of forest resources; and the health of the forest. Users of FIA data, estimates, and related products include land managers, policy and decision-makers, forest industry, environmental organizations, and university researchers. To accomplish its mission, the FIA program has established a sampling design with an intensity of approximately one permanent plot per 2,400 ha across the entire country. Depending on the region of the country, each plot is remeasured at intervals of five or 10 years. The program releases data annually and reports estimates at the county level for each state every five years. Due to budgetary constraints and natural variability among plot observations, sufficient numbers of plots cannot be measured to satisfy precision guidelines for the estimates of many variables unless the estimation process is enhanced using ancillary data. Classified satellite imagery has been demonstrated to be a source of ancillary data that can be used with stratified estimation techniques to increase the precision of estimates with little corresponding increase in costs. A crucial factor restricting the utility of FIA data is that the exact locations of inventory plots cannot be released to the public. Thus, users are generally not able to obtain estimates for small areas or for their own areas of interest if exact plot locations are required. To compensate, satellite imagery, inventory plot data, and the k-Nearest Neighbors technique are being used to construct Internet-based maps of forest attributes from which estimates for arbitrary user-defined areas of interest may be obtained.

• Journal of the Korean Data and Information Science Society
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• 제23권4호
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• pp.815-823
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• 2012

In this paper reliability growth model in which the operating time between successive failure is a continuous random variable is proposed. This model is for Burr type XII distribution with two parameters which is discussed in two versions: the order statistics and non-homogeneous Poisson process. The two software reliability measures are obtained. The performance for two versions of the suggested model is tested on real data set by U-plot and Y-plot using Kolmogorov distance.

• 대한기계학회논문집
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• 제4권2호
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• pp.47-53
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• 1980

Kikukawa-Compliance method using a conventional clip-on gauge was employed to investigate fatigue crack growth and crack closure in 2017-T3 aluminum alloy. The crack growth rate plot against stress intensity range .DELTA.K on a log-log diagram exhibits a bilinear form with a transition at the growth rate of 10$\^$-4/ mm/cycle. The bilinear form appears still in the plot of growth rate versus effective stress intensity range .DELTA.K$\_$eff/. Fatigue crack growth rate could be well represented by .DELTA.K$\_$eff. The experimental results indicate that the effective stress intensity range ratio U depends on the maximum stress intensity factor K$\_$max/, but the stress ratio R does not affect U. The crack opening stress intensity factor K$\_$op/ tends to increase with increasing K$\_$max/ and decrease with increasing .DELTA.K.

• Journal of the Korean Data and Information Science Society
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• 제19권4호
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• pp.1361-1369
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• 2008

The analysis of software reliability model provides the means to analysts, software engineers, and systems analysts and developers who want to predict, estimate, and measure failure rate of occurrences in software. In this paper, reliability growth model, in which the operating time between successive failure is a continuous random variable, is proposed. This model is based on order statistics of two parameters Burr type XII distribution. We propose the measure based on U-plot. Also the performance of the suggested model is tested on real data set.