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Lee, Yoon,Woo, Jung-Soo,Eo, Soo-Heang,Seo, Deog-Gyu Korean Academy of Dental Science 2015 Journal of korean dental science Vol.8 No.2
Purpose: To evaluate the effect of light-curing on the immediate and delayed micro-shear bond strength (${\mu}SBS$) between yttria-tetragonal zirconia polycrystal (Y-TZP) ceramics and RelyX Ultimate when using Single Bond Universal (SBU). Materials and Methods: Y-TZP ceramic specimens were ground with #600-grit SiC paper. SBU was applied and RelyX Ultimate was mixed and placed on the Y-TZP surface. The specimens were divided into three groups depending on whether light curing was done after adhesive (SBU) and resin cement application: uncured after adhesive and uncured after resin cement application (UU); uncured after adhesive, but light cured after resin cement (UC); and light cured after adhesive and light cured resin cement (CC). The three groups were further divided depending on the timing of ${\mu}SBS$ testing: immediate at 24 hours (UUI, UCI, CCI) and delayed at 4 weeks (UUD, UCD, CCD). ${\mu}SBS$ was statistically analyzed using one-way ANOVA and Student-Newman-Keuls multiple comparison test (P<0.05). The surface of the fractured Y-TZP specimens was analyzed under a scanning electron microscope (SEM). Result: At 24 hours, ${\mu}SBS$ of UUI group ($8.60{\pm}2.06MPa$) was significantly lower than UCI group ($25.71{\pm}4.48MPa$) and CCI group ($29.54{\pm}3.62MPa$) (P<0.05). There was not any significant difference between UCI and CCI group (P>0.05). At 4 weeks, ${\mu}SBS$ of UUD group ($24.43{\pm}2.88MPa$) had significantly increased over time compared to UUI group (P<0.05). The SEM results showed mixed failure in UCI and CCI group, while UUI group showed adhesive failure. Conclusion: Light-curing of universal adhesive before or after application of RelyX Ultimate resin cement significantly improved the immediate ${\mu}SBS$ of resin cement to air-abrasion treated Y-TZP surface. After 4 weeks, the delayed ${\mu}SBS$ of the non-light curing group significantly improved to the level of light-cured groups.
정연해,어수행,문호석,조형준,Jung, Yon-Hae,Eo, Soo-Heang,Moon, Ho-Seok,Cho, Hyung-Jun 한국통계학회 2010 Communications for statistical applications and me Vol.17 No.4
본 논문은 8가지 방법의 데이터 마이닝 알고리즘(CART, QUEST, CRUISE, 로지스틱 회귀분석, 선형판별분석, 이차판별분석, 신경망분석, 서포트 벡터 머신) 기법과 단일 알고리즘에 2가지 앙상블기법(배깅, 부스팅)을 적용한 16가지 방법을 바탕으로 총 24가지의 방법을 비교하였다. 알고리즘의 성능 비교를 위하여 13개의 이항반응변수로 구성된 데이터를 사용하였다. 비교 기준은 민감도, 특이도 및 오분류율을 사용하여 데이터 마이닝 기법의 성능향상에 대해 평가하였다. We studied the performance of 8 data mining algorithms including decision trees, logistic regression, LDA, QDA, Neral network, and SVM and their combinations of 2 ensemble techniques, bagging and boosting. In this study, we utilized 13 data sets with binary responses. Sensitivity, Specificity and missclassificate error were used as criteria for comparison.
Modified partial least squares method implementing mixed-effect model
Kyunga Kim,Shin-Jae Lee,Soo-Heang Eo,HyungJun Cho,Jae Won Lee 한국통계학회 2023 Communications for statistical applications and me Vol.30 No.1
Contemporary biomedical data often involve an ill-posed problem owing to small sample size and large number of multi-collinear variables. Partial least squares (PLS) method could be a plausible alternative to an ill-conditioned ordinary least squares. However, in the case of a PLS model that includes a random-effect, how to deal with a random-effect or mixed effects remains a widely open question worth further investigation. In the present study, we propose a modified multivariate PLS method implementing mixed-effect model (PLSM). The advantage of PLSM is its versatility in handling serial longitudinal data or its ability for taking a random-effect into account. We conduct simulations to investigate statistical properties of PLSM, and showcase its real clinical application to predict treatment outcome of esthetic surgical procedures of human faces. The proposed PLSM seemed to be particularly beneficial 1) when random-effect is conspicuous; 2) the number of predictors is relatively large compared to the sample size; 3) the multicollinearity is weak or moderate; and/or 4) the random error is considerable.
Kang, Hyo Jeong,Haq, Farhan,Sung, Chang Ohk,Choi, Jene,Hong, Seung-Mo,Eo, Soo-Heang,Jeong, Hui Jeong,Shin, Jinho,Shim, Ju Hyun,Lee, Han Chu,An, Jihyun,Kim, Mi-Ju,Kim, Kyu-pyo,Ahn, Sung-Min,Yu, Eunsil S. Karger AG 2019 Liver cancer Vol.8 No.1
<P><B><I>Background:</I></B> <I>FGF19</I> amplification is a relatively novel type of genetic aberration that has been proposed to be a driver of hepatocarcinogenesis. Selective inhibitors of <I>FGFR4</I>, a receptor of <I>FGF19</I>, have been developed as targeted therapies for hepatocellular carcinoma (HCC). Despite the role of <I>FGF19</I> in mediating HCC progression, the clinicopathological characterization of patients exhibiting <I>FGF19</I> amplification remains unclear. Immunohistochemical staining is the simplest and most widely used method of identifying aberrations in the <I>FGF19</I> gene, although its specificity is very low. <B><I>Methods:</I></B> This study investigated the prognostic significance of <I>FGF19</I> amplification in a large cohort of 989 HCC patients using fluorescence in situ hybridization (FISH), which has a high degree of specificity. In addition, FISH data from formalin-fixed, paraffin-embedded sections were compared with copy number variation (CNV) data obtained from fresh frozen sections to validate the use of FISH as a diagnostic tool. <B><I>Results:</I></B> <I>FGF19</I> amplifications were detected by FISH in 51 (5.15%) of the 989 patients, and were independently associated with poor survival and a higher risk of tumor recurrence, as well as with poor prognostic factors such as a high α-fetoprotein level, hepatitis B or C virus infection, a large tumor size, microvascular invasion, and necrosis. In addition, <I>FGF19</I> amplification was associated with <I>TP53</I> mutation, and was mutually exclusive with <I>CTNNB1</I> mutation. The results of the FISH and CNV analyses exhibited a significant concordance rate of 96% (κ = 0.618, <I>p</I> < 0.001). <B><I>Conclusions:</I></B> These data indicate that <I>FGF19</I> amplification represents a unique molecular subtype associated with poor prognostic characteristics, which supports the hypothesis that the <I>FGF19-FGFR4</I> signaling pathway plays an important role in hepatocarcinogenesis. We have also demonstrated that FISH is a viable alternative to CNV analysis, offering a number of advantages in the clinical setting.</P>