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Search Results: 1 - 10 of 20086 matches for " Song Vogue Ahn "
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Correlation between Serum Neutrophil Gelatinase Associated Lipocalin and Burn Severity: A Pilot Study  [PDF]
Sungjun Lee, Suyeol Lee, Youngwhan Choi, Song Vogue Ahn, Cheonjae Yoon, Jungsuk Lee
Journal of Biosciences and Medicines (JBM) , 2017, DOI: 10.4236/jbm.2017.51002
Abstract: The severity of an initial burn injury is critical for determining the treatment plan and prognosis of burn patients. Here, we measured serum neutrophil gelatinase-associated lipocalin (NGAL) levels to determine whether NGAL can be used as a biomarker for severity of burn injuries. A study of the demographic, clinical, and laboratory markers for various organ damage was performed at Bestian Burn Center (n = 10 healthy people, n = 31 patients). NGAL and organ damage marker levels were measured in 31 patients with severe burns within 2 - 3 days following their admission to the intensive care unit. Serum NGAL level of the expired patients was 788.5 (685.0 - 998.0) pg/mL, whereas that of the discharged patients was 421.2 (356.2 - 480.6) pg/mL, showing that the initial serum NGAL level can be used to estimate mortality. We also determined the correlation between serum NGAL level and the currently used severity markers (total body surface area burned and abbreviated burn severity index) and confirmed that serum NGAL level could be used as a severity marker. We also found that serum NGAL level was correlated with damage of organs such as the liver, kidney, heart, and respiratory organs in patients with severe burns.
Association between Depressive Symptoms and Bone Stiffness Index in Young Adults: The Kangwha Study
Sun Min Oh, Hyeon Chang Kim, Kyoung Min Kim, Song Vogue Ahn, Dong Phil Choi, Il Suh
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0069929
Abstract: Objective Young adulthood is an important period for both bone and mental health. This study investigated the association between depressive symptoms and bone density in apparently healthy Korean men and women aged 29?32 years. Methods This study is a cross-sectional analysis of data from 123 men and 133 women who completed follow-up examinations of the Kangwha study in 2010?2011. Bone stiffness index (SI) was measured at the os calcis using a quantitative ultrasound device. Depressive symptoms were evaluated using the Korean version of the Beck Depression Inventory (K-BDI) and classified as normal (K-BDI <10), mild (K-BDI 10–15), and moderate to severe (K-BDI ≥16). Results Moderate to severe depressive symptoms were prevalent among 11.4% of men and 19.6% of women. Higher K-BDI scores were significantly correlated to SI in men, before (ρ = –0.286, p = 0.001) and after (ρ = –0.228, p = 0.013) adjustment for covariates. Men with depressive symptoms tended to have a lower SI; multivariate-adjusted mean SI in men with normal, mild, and moderate to severe depressive symptoms was 104.1±3.1, 100.9±5.9, and 94.1±7.8, respectively (p for trend = 0.021). In contrast, no significant correlations were identified in women. Conclusions Depressive symptoms were significantly associated with lower SI in men, but not in women. Further studies are necessary to evaluate the impact of depression on developing osteoporosis or osteoporotic fractures later in life.
Adiponectin Provides Additional Information to Conventional Cardiovascular Risk Factors for Assessing the Risk of Atherosclerosis in Both Genders
Jin-Ha Yoon, Sung-Kyung Kim, Ho-June Choi, Soo-In Choi, So-Youn Cha, Sang-Baek Koh, Hee-Taik Kang, Song Vogue Ahn
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0075535
Abstract: Background This study evaluated the relation between adiponectin and atherosclerosis in both genders, and investigated whether adiponectin provides useful additional information for assessing the risk of atherosclerosis. Methods We measured serum adiponectin levels and other cardiovascular risk factors in 1033 subjects (454 men, 579 women) from the Korean Genomic Rural Cohort study. Carotid intima–media-thickness (CIMT) was used as measure of atherosclerosis. Odds ratios (ORs) with 95% confidence intervals (95% CI) were calculated using multiple logistic regression, and receiver operating characteristic curves (ROC), the category-free net reclassification improvement (NRI) and integrated discrimination improvement (IDI) were calculated. Results After adjustment for conventional cardiovascular risk factors, such as age, waist circumference, smoking history, low-density and high-density lipoprotein cholesterol, triglycerides, systolic blood pressure and insulin resistance, the ORs (95%CI) of the third tertile adiponectin group were 0.42 (0.25–0.72) in men and 0.47 (0.29–0.75) in women. The area under the curve (AUC) on the ROC analysis increased significantly by 0.025 in men and 0.022 in women when adiponectin was added to the logistic model of conventional cardiovascular risk factors (AUC in men: 0.655 to 0.680, p = 0.038; AUC in women: 0.654 to 0.676, p = 0.041). The NRI was 0.32 (95%CI: 0.13–0.50, p<0.001), and the IDI was 0.03 (95%CI: 0.01–0.04, p<0.001) for men. For women, the category-free NRI was 0.18 (95%CI: 0.02–0.34, p = 0.031) and the IDI was 0.003 (95%CI: ?0.002–0.008, p = 0.189). Conclusion Adiponectin and atherosclerosis were significantly related in both genders, and these relationships were independent of conventional cardiovascular risk factors. Furthermore, adiponectin provided additional information to conventional cardiovascular risk factors regarding the risk of atherosclerosis.
Peak-to-Peak Exponential Direct Learning of Continuous-time Recurrent Neural Network Models: A Matrix Inequality Approach
Choon Ki Ahn and Moon Kyou Song
Journal of Inequalities and Applications , 2013, DOI: 10.1186/1029-242X-2013-68
Abstract: The purpose of this paper is to propose a new peak-to-peak exponential direct learning law (P2PEDLL) for continuous-time dynamic neural network models with disturbance. Dynamic neural network models trained by the proposed P2PEDLL based on matrix inequality formulation are exponentially stable, with a guaranteed exponential peak-to-peak norm performance. The proposed P2PEDLL can be determined by solving two matrix inequalities with a fixed parameter, which can be efficiently checked using existing standard numerical algorithms. We use a numerical example to demonstrate the validity of the proposed direct learning law.
Ferromagnetically coupled magnetic impurities in a quantum point contact
Taegeun Song,Kang-Hun Ahn
Physics , 2010, DOI: 10.1103/PhysRevLett.106.057203
Abstract: We investigate the ground and excited states of interacting electrons in a quantum point contact using exact diagonalization method. We find that strongly localized states in the point contact appear when a new conductance channel opens due to momentum mismatch. These localized states form magnetic impurity states which are stable in a finite regime of chemical potential and excitation energy. Interestingly, these magnetic impurities have ferromagnetic coupling, which shed light on the experimentally observed puzzling coexistence of Kondo correlation and spin filtering in a quantum point contact.
Generic Initial ideals of Singular Curves in Graded Lexicographic Order
Jeaman Ahn,Sijong Kwak,YeongSeok Song
Mathematics , 2011,
Abstract: In this paper, we are interested in the generic initial ideals of \textit{singular} projective curves with respect to the graded lexicographic order. Let $C$ be a \textit{singular} irreducible projective curve of degree $d\geq 5$ with the arithmetic genus $\rho_a(C)$ in $\p^r$ where $r\ge 3$. If $M(I_C)$ is the regularity of the lexicographic generic initial ideal of $I_C$ in a polynomial ring $k[x_0,..., x_r]$ then we prove that $M(I_C)$ is $1+\binom{d-1}{2}-\rho_a(C)$ which is obtained from the monomial $$ x_{r-3} x_{r-1}\,^{\binom{d-1}{2}-\rho_a(C)}, $$ provided that $\dim\Tan_p(C)=2$ for every singular point $p \in C$. This number is equal to one plus the number of non-isomorphic points under a generic projection of $C$ into $\p^2$. %if $\deg(C)=3,4$ then $M(I_C)= \deg(C)$ by the direct computation. Our result generalizes the work of J. Ahn for \textit{smooth} projective curves and that of A. Conca and J. Sidman \cite{CS} for \textit{smooth} complete intersection curves in $\p^3$. The case of singular curves was motivated by \cite[Example 4.3]{CS} due to A. Conca and J. Sidman. We also provide some illuminating examples of our results via calculations done with {\it Macaulay 2} and \texttt {Singular} \cite{DGPS, GS}.
The Degree Complexity of Smooth Surfaces of codimension 2
Jeaman Ahn,Sijong Kwak,YeongSeok Song
Mathematics , 2010,
Abstract: D.Bayer and D.Mumford introduced the degree complexity of a projective scheme for the given term order as the maximal degree of the reduced Gr\"{o}bner basis. It is well-known that the degree complexity with respect to the graded reverse lexicographic order is equal to the Castelnuovo-Mumford regularity (\cite{BS}). However, little is known about the degree complexity with respect to the graded lexicographic order (\cite{A}, \cite{CS}). In this paper, we study the degree complexity of a smooth irreducible surface in $\p^4$ with respect to the graded lexicographic order and its geometric meaning. Interestingly, this complexity is closely related to the invariants of the double curve of a surface under the generic projection. As results, we prove that except a few cases, the degree complexity of a smooth surface $S$ of degree $d$ with $h^0(\mathcal I_S(2))\neq 0$ in $\p^4$ is given by $2+\binom{\deg Y_1(S)-1}{2}-\rho_{a}(Y_{1}(S))$, where $Y_1(S)$ is a double curve of degree $\binom{d-1}{2}-\rho_{a}(S \cap H)$ under a generic projection of $S$ (Theorem \ref{mainthm2}). Exceptional cases are either a rational normal scroll or a complete intersection surface of $(2,2)$-type or a Castelnuovo surface of degree 5 in $\p^4$ whose degree complexities are in fact equal to their degrees. This complexity can also be expressed only in terms of the maximal degree of defining equations of $I_S$ (Corollary \ref{cor:01} and \ref{cor:02}). We also provide some illuminating examples of our results via calculations done with {\it Macaulay 2} (Example \ref{Exam:01}).
Review of Children’s Identity Construction via Narratives  [PDF]
Jiryung Ahn
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.25060
Abstract: Understanding oneself is a fundamental human concern that starts early and continues throughout life. Identity construction is also a life-long process, but early childhood is the critical period for laying the foundation. Children’s identity construction proceeds through diverse perspectives which do not necessarily follow developmental steps. These perspectives include how children view themselves in relation to others through narratives, and how they embody themselves in the peer interactions of peer group and school. Self-identity is changed and transformed through interactions with environment and diverse experiences. The various ways children construct their identities reveal their efforts to “become.” Understanding who we are in early childhood opens the door to acknowledging ourselves as significant human beings.
Korean Academic Librarians’ Recognition of the High Density Book Storage System  [PDF]
Joonsuk Ahn
Journal of Building Construction and Planning Research (JBCPR) , 2013, DOI: 10.4236/jbcpr.2013.14012
Abstract: Korean academic libraries are facing a serious space shortage problem due to the inability to uphold the rapidly increasing amount of printed materials despite having expanded the number of physical facilities. Data computerization has been considered as a solution to the issue, but deliberation for the High Density Book Storage System has been on the rise because of its impressive method of preserving printed materials in a realistic facility. Despite the different methods of print material storage, Korean academic libraries have largely focused on investing in the least efficient method of compact shelving to solve this issue. It is hypothesized that the misuse of funds on inefficient systems is occurring due to the lack of knowledge about the high-density book storage systems like the Harvard model. In order to propose a realistic solution to the academic library space shortage crisis on a logical basis, it is imperative that a study of academic librarians is conducted to investigate their knowledge on such efficient storage systems.
Effect Modeling of Count Data Using Logistic Regression with Qualitative Predictors  [PDF]
Haeil Ahn
Engineering (ENG) , 2014, DOI: 10.4236/eng.2014.612074
Abstract: We modeled binary count data with categorical predictors, using logistic regression to develop a statistical method. We found that ANOVA-type analyses often performed unsatisfactorily, even when using different transformations. The logistic transformation of fraction data could be an alternative, but it is not desirable in the statistical sense. We concluded that such methods are not appropriate, especially in cases where the fractions were close to 0 or 1. The major purpose of this paper is to demonstrate that logistic regression with an ANOVA-model like parameterization aids our understanding and provides a somewhat different, but sound, statistical background. We examined a simple real world example to show that we can efficiently test the significance of regression parameters, look for interactions, estimate related confidence intervals, and calculate the difference between the mean values of the referent and experimental subgroups. This paper demonstrates that precise confidence interval estimates can be obtained using the proposed ANOVA-model like approach. The method discussed here can be extended to any type of experimental fraction data analysis, particularly for experimental design.
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