• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 춘계학술대회 논문집
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• pp.479-480
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• 2009

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 춘계학술대회 논문집
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• pp.671-672
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• 2008

• 치위생과학회지
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• 제16권4호
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• pp.257-262
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• 2016

TMR은 초기우식 평가의 gold standard로 여겨지나 시편을 파괴하여야만 시편의 무기질 밀도를 확인할 수 있는 실험법이다. 그러나 OCT는 비파괴적인 검사법으로 임상에서도 초기우식을 확인하는 데 사용하므로 본 연구에서는 $200{\mu}m$ 이상의 깊은 법랑질 초기우식에서의 OCT와 TMR에서 구한 integrated mineral loss값 간의 상관성을 확인하고자 하였다. $200{\mu}m$ 이상의 깊이를 갖는 인공 초기우식병소를 제작하여 TMR (${\Delta}Z_{TMR}$)과 OCT (${\Delta}R_{OCT}$)에서 구한 integrated mineral loss를 각각 구하여 상관성 분석을 시행하였으며 Bland-Altman plot을 그려 두 값 간의 오차 분석을 시행하였다. ${\Delta}R_{OCT}$과 ${\Delta}Z_{TMR}$ 간에는 유의한 상관성이 확인되었으며(r=0.491, p=0.003), Bland-Altman plot 상에서도 ${\Delta}Z_{TMR}$과 ${\Delta}R_{OCT}$값 간의 차이가 거의 대부분 오차 구간 내에 있는 것이 확인되어 두 측정 방법 간의 오차가 적은 것으로 확인되었다. 따라서 치과임상에서 OCT를 활용하면 초기우식병소의 탐지 및 모니터링 그리고 초기우식병소의 심도 파악이 가능할 것으로 여겨진다.

• Bulletin of the Korean Chemical Society
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• 제34권7호
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• pp.2001-2005
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• 2013

The second-order rate constants ($k_{OH^-}$) for the reactions of Y-substituted-phenyl diphenylphosphinates (4a-4i) with $OH^-$ in $H_2O$ at $25.0{\pm}0.1^{\circ}C$ have been measured spectrophotometrically. Comparison of $k_{OH^-}$ with $k_{EtO^-}$ (the second-order rate constants for the corresponding reactions with $EtO^-$ in ethanol) has revealed that $EtO^-$ is less reactive than $OH^-$ although the former is ca. 3.4 $pK_a$ units more basic than the latter, indicating that the reactivity of these nucleophiles is not governed by their basicity alone. The Br${\o}$nsted-type plot for the reactions of 4a-4i with $OH^-$ is linear with ${\beta}_{lg}$ = -0.36. The Hammett plot correlated with ${\sigma}^-$ constants results in a slightly better correlation than that correlated with ${\sigma}^{\circ}$ constants but exhibits many scattered points. In contrast, the Yukawa-Tsuno plot for the same reactions exhibits an excellent linear correlation with ${\rho}$ = 0.95 and r = 0.55. The r value of 0.55 implies that a negative charge develops partially on the O atom of the leaving group. Thus, the reactions of 4a-4i with $OH^-$ have been concluded to proceed through a concerted mechanism.

• The Korean Journal of Ecology
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• 제9권3호
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• pp.161-184
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• 1986

An experiment was made in order to analyze the growth characteristics and productivity of Zoysia japonica under control, mowing and TIBA treatment conditions at the experimental farm of Kyung Hee univ. from May 26 to Oct. 1 in 1985. The field was planned by the randomized block design method and each treatment was given to three plots (2${\times}$2, 4${\times}$4 and 10${\times}$10 cm) and was replicated three times. Each plot was 1$m^2$ for Zoysia japonica. The sampling of each plot was taken once a week after sowing. In order to know the dry matter of total standing crops, kept 9$0^{\circ}C$ and weighted each organ of the plants. Total leaf area of a plant was measured by drawing method. The author adopted the growth analysis of English School. The increasing rates of numbers of leaf and stem were remarkably high in each plot between 10th and 12th weak after sowing and it was highest in TIBA treated plot. The increasin rate of leaf area in each plot was remarkably high beween 10th and 12th week and the maximum value of leaf area was 274.00c$m^2$ in TIBA treated plot of 100 plants/$m^2$. The increasing rate of standing crop was remarkably high between 10th and 12th week and the high increasing tendency in TIBA plot resulted from TIBA. The positive correlationship was founded between standing crop and leaf area. The evaporation rather than temperature acted as a main factor of negative correlation with standing crop during the experiment period. Solar radiation had a high positive correlation in the lower density of plot. C/F ratio was low, during the growth period, from 10th to 12th week after sowing and was low in the higher density under each treated plot. T/R ratio was not constant during the sampling period but was high in the lower density. The increasing rates of RGR and NAR were high between 11th and 12th week after sowing. Leaf area ratio was high in higher density in each plot and not constant in all treated plot.

• 생물환경조절학회지
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• 제14권1호
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• pp.46-51
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• 2005

참외 정식 생력화 및 기계화 정식을 위한 기초자료로 활용코자 금싸라기은천 참외에 신토좌 호박을 호접하여 9cm폿트에 45일간 육묘하여 1월 16일 정식하였다. 정식 깊이는 모종을 폿트에서 뽑아 땅에 올려놓는 0cm깊이 정식구, 모종을 폿트 높이의 1/2만 묻는 4.5cm 깊이 정식구, 폿트 높이까지만 묻는 9cm 깊이 정식구(표준), 폿트 높이보다 깊게 묻는 12cm 깊이 정식구로 나누어 비교하였다. 1월 18일부터 19일까지의 터널 최저온도는 $9.3^{\circ}C$, 최고온도는 $41.2^{\circ}C$이었으며 습도는 $59\~99\%$이었다 정식 후 활착은 정식깊이가 깊을수록 빨랐으나, 정식 40일 후의 생육은 0cm 처리구를 제외한 4.5cm, 9cm, 12cm 깊이 정식구간에는 처리간 차이가 없었다 과중은 4.5cm 깊이 정식구에서 가장 무거웠고 과육두께와 당도는 처리간 차이가 없었다. 정식 깊이가 깊을수록 발효과율이 증가하였고 상품과율은 감소하였다. 10a당 상품수량은 9cm 깊이 정식구의 2,361kg에 비하여 0cm 처리구에서는 $2\%$, 4.5cm 처리구에서는 $1\%$ 증가하였으나 12cm 처리구에서는 $11\%$ 감소하였다.

• 통합자연과학논문집
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• 제13권2호
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• pp.76-82
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• 2020

If normality of an observed data is not a viable assumption, we can carry out normal-theory analyses by suitable transforming data. Power transformation by Box and Cox, one of the transformation methods, is derived the power which maximized the likelihood function. But it doesn't induces the closed form in mathematical analysis. In this paper, we compose some R the syntax of which is easier than other statistical packages for deriving the power with using numerical methods. Also, by using R, we show the transformed data approximately distributed the normal through Q-Q plot in univariate and bivariate cases with some examples. Finally, we present the value of a goodness-of-fit statistic(AD) and its p-value for normal distribution. In the similar procedure, this method can be extended to more than bivariate case.

• 한국유기농업학회지
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• 제16권4호
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• pp.435-453
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• 2008

유기농업에서 윤작은 중요하고, 윤작작부체계에는 반드시 두과작물이 포함되어야 한다. 대두재배 영농현장에서 근류균 접종을 토양접종으로 손쉽게 파종 전에 실시할 수 있겠으나, 유기농 토양조건에서 토양접종의 효과에 대한 검토가 필요하다. 본 실험은 토양의 근류균 접종이 대두의 근류 형성과 생육 및 수량에 미치는 영향을 알아보고자 천안시 입장면에 소재한 단국대학교 유기농업연구소 실습포장에서 대원콩, 신팔달콩2호, SS2-2을 공시하여 2006년도에 수행하였다. 토양의 근류균 접종에 따른 공시품종의 근류수는 무처리구보다 처리구가 $1.4{\sim}2$배 가량 많았다. 무처리구는 개화성기(R2)이후부터 근류형성이 감소하였으나 처리구는 착협성기(R4)까지 근류의 수가 증가하다 이후 감소하였다. 토양의 근류균 접종에 따른 공시품종 근류중량의 경시적 변화는 근류수의 경시적 변화와 같은 경향을 보였다. 대원콩은 처리구의 건물중이 무처리구보다 증가했지만 신팔달콩2호와 SS2-2는 무처리구보다 처리구의 건물중이 감소하였다. chlorophyll 함량은 대원콩의 경우 무처리구보다 처리구에서 9% 가량 높았으나, 신팔달2호콩과 SS2-2는 오히려 처리구에서 각각 13%, 33% 가량 낮았다. 토양의 근류균 접종에 따른 대원콩 협수, 립수, 립중은 처리구가 증가하였지만 신팔달 2 호콩과 SS2-2의 협수, 립수, 립중은 처리구가 오히려 감소하였다. 토양의 근류균 접종에 따른 10a당 수량은 대원콩은 처리구가 13% 증가하였으나 신팔달2호콩은 처리구가 4% 감소하였고, SS2-2도 처리구가 23% 감소하였다.

• Bulletin of the Korean Chemical Society
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• 제31권12호
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• pp.3588-3592
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• 2010

Second-order rate constants ($k_N$) have been measured spectrophotometrically for nucleophilic substitution reactions of 2-pyridyl X-substituted benzoates 8a-e with a series of alicyclic secondary amines in $H_2O$ at $25.0{\pm}0.1^{\circ}C$. The $k_N$ values for the reactions of 8a-e are slightly smaller than the corresponding reactions of 4-nitrophenyl X-substituted benzoates 1a-e (e.g., $kN^{1a-e}/k_N^{8a-e}$ = 1.1 ~ 3.1), although 2-pyridinolate in 8a-e is ca. 4.5 $pK_a$ units more basic than 4-nitrophenolate in 1a-e. The Br$\o$nsted-type plot for the aminolysis of 8c (X = H) is linear with $\beta_{nuc}$ = 0.77 and $R^2$ = 0.991 (Figure 1), which is typical for reactions reported previously to proceed through a stepwise mechanism with breakdown of a zwitterionic tetrahedral intermediate $T^{\pm}$ being the rate-determining step (RDS), e.g., aminolysis of 4-nitrophenyl benzoate 1c. The Hammett plot for the reactions of 8a-e with piperidine consists of two intersecting straight lines (Figure 2), i.e., $\rho$ = 1.71 for substrates possessing an electron-donating group (EDG) while $\rho$ = 0.86 for those bearing an electron-withdrawing group (EWG). Traditionally, such a nonlinear Hammett plot has been interpreted as a change in RDS upon changing substituent X in the benzoyl moiety. However, it has been proposed that the nonlinear Hammett is not due to a change in RDS since the corresponding Yukawa-Tsuno plot exhibits excellent linear correlation with $\rho$ = 0.85 and r = 0.62 ($R^2$ = 0.995, Figure 3). Stabilization of substrates 8a-e in the ground state has been concluded to be responsible for the nonlinear Hammett plot.

• 아시안잔디학회지
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• 제5권2호
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• pp.95-114
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• 1991

This paper was designed to estimate the interaction of the first productivity, light conditions and to analyze the ecophysiological productivity, growth characteristics grown under various shading conditions in Zoysia japonica . The results summarized this experiment were as follows; 1.After transplanting the grass, increasing rate of leaf number and total leaf length was remarkahly high at the early growth stage in the control and the 30% shading plot. 2.The increasing rate of leaf area ratio (LA R) in all the experimental plot was remarkable high at the early growth stage after transplanting the grass. Especially, the control and 30% shading plot in compared with another plots, were remarkably high at rate of leaf area. 3.The length and the node number of rhizome in the control and 30% shading plot were also high and the difference was significantly large by the growth stage. 4.Chlorophyll content was very high at 36days after transplanting and then decreased. Increasing rate of shade resulted in its low content. The rate of chlorophyll a to b was decreased by in-creasing rate of shade. 5.The content of soluble sugar in the control and 30% shading plot was low at the early growth after transplanting and high at the late growth stage. Its content in the plot of 70% shading was remarkably low throughout the growth stage. 6.The increasing rate of standing plant in all the experimental plots was high at the early growth stage after transplanting. Increasing rate of shade was typically low through all the growth stage.