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Search Results: 1 - 10 of 45679 matches for " Yeo-Jin KIM "
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Anonymous Authorship Control for User-Generated Content
Suk-Bong LEE,Sang-Gyoo SIM,Yeo-Jin KIM,Yun-Sang OH
Journal of Systemics, Cybernetics and Informatics , 2007,
Abstract: User-Generated Content (UGC) is opening up new large market in content services, and more and more people are visiting web sites to share and enjoy UGCs. These trends make many authors to move into online. Authors want to conserve their authorship and expect to publish their UGC anonymously in cases. To meet the requirements, we propose a new authorship control model based on watermarking and metadata. Authors can embed their authorship into their UGC with identities or with anonym. Even though an author publishes his UGC anonymously, he can prove his authorship without unveiling his identity via 5 methods utilizing the proposed authorship model. The proposed model and methods need no TTP and are robust even based on fragile underlying watermarking scheme.
Copy number variations (CNVs) identified in Korean individuals
Tae-Wook Kang, Yeo-Jin Jeon, Eunsu Jang, Hee-Jin Kim, Jeong-Hwan Kim, Jong-Lyul Park, Siwoo Lee, Yong Kim, Jong Kim, Seon-Young Kim
BMC Genomics , 2008, DOI: 10.1186/1471-2164-9-492
Abstract: We identified 65 copy number variation regions (CNVRs) in 116 normal Korean individuals by analyzing Affymetrix 250 K Nsp whole-genome SNP data. Ten of these CNVRs were novel and not present in the Database of Genomic Variants (DGV). To increase the specificity of CNV detection, three algorithms, CNAG, dChip and GEMCA, were applied to the data set, and only those regions recognized at least by two algorithms were identified as CNVs. Most CNVRs identified in the Korean population were rare (<1%), occurring just once among the 116 individuals. When CNVs from the Korean population were compared with CNVs from the three HapMap ethnic groups, African, European, and Asian; our Korean population showed the highest degree of overlap with the Asian population, as expected. However, the overlap was less than 40%, implying that more CNVs remain to be discovered from the Asian population as well as from other populations. Genes in the novel CNVRs from the Korean population were enriched for genes involved in regulation and development processes.CNVs are recently-recognized structural variations among individuals, and more CNVs need to be identified from diverse populations. Until now, CNVs from Asian populations have been studied less than those from European or American populations. In this regard, our study of CNVs from the Korean population will contribute to the full cataloguing of structural variation among diverse human populations.Understanding variations in the human genome is the key to unraveling the phenotypic diversity among individuals and understanding various human diseases. Genomic variations exist at various levels, from differences in single nucleotides to microscopic chromosome-level variation [1]. Copy number variations (CNVs), a new type of genomic variation that has recently received considerable attention, are deletions, insertions, duplications, and more complex variations ranging from 1 kb to submicroscopic sizes [1-4]. Recent advances in array technolo
A New Human Perception-Based Over-Exposure Detection Method for Color Images
Yeo-Jin Yoon,Keun-Yung Byun,Dae-Hong Lee,Seung-Won Jung,Sung-Jea Ko
Sensors , 2014, DOI: 10.3390/s140917159
Abstract: To correct an over-exposure within an image, the over-exposed region (OER) must first be detected. Detecting the OER accurately has a significant effect on the performance of the over-exposure correction. However, the results of conventional OER detection methods, which generally use the brightness and color information of each pixel, often deviate from the actual OER perceived by the human eye. To overcome this problem, in this paper, we propose a novel method for detecting the perceived OER more accurately. Based on the observation that recognizing the OER in an image is dependent on the saturation sensitivity of the human visual system (HVS), we detect the OER by thresholding the saturation value of each pixel. Here, a function of the proposed method, which is designed based on the results of a subjective evaluation on the saturation sensitivity of the HVS, adaptively determines the saturation threshold value using the color and the perceived brightness of each pixel. Experimental results demonstrate that the proposed method accurately detects the perceived OER, and furthermore, the over-exposure correction can be improved by adopting the proposed OER detection method.
Pogostemon cablin as ROS Scavenger in Oxidant-Induced Cell Death of Human Neuroglioma Cells
Hyung Woo Kim,Su Jin Cho,Bu-Yeo Kim,Su In Cho,Young Kyun Kim
Evidence-Based Complementary and Alternative Medicine , 2010, DOI: 10.1093/ecam/nem176
Abstract: Reactive oxygen species (ROS) have been implicated in the pathogenesis of a wide range of acute and long-term neurodegenerative diseases. This study was undertaken to examine the efficacy of Pogostemon cablin, a well-known herb in Korean traditional medicine, on ROS-induced brain cell injury. Pogostemon cablin effectively protected human neuroglioma cell line A172 against both the necrotic and apoptotic cell death induced by hydrogen peroxide (H2O2). The effect of Pogostemon cablin was dose dependent at concentrations ranging from 0.2 to 5?mg ml?1. Pogostemon cablin significantly prevented depletion of cellular ATP and activation of poly ADP-ribose polymerase induced by H2O2. The preservation of functional integrity of mitochondria upon the treatment of Pogostemon cablin was also confirmed by 3-(4,5-dimethyl-2-thiazyl)-2,5-diphenyl-2-H-tetrazolium bromide assay. Furthermore, Pogostemon cablin significantly prevented H2O2-induced release of cytochrome c into cytosol. Determination of intracellular ROS showed that Pogostemon cablin might exert its role as a powerful scavenger of intracellular ROS. The present study suggests the beneficial effect of Pogostemon cablin on ROS-induced neuroglial cell injury. The action of Pogostemon cablin as a ROS-scavenger might underlie the mechanism.
Bis(methanol-κO)bis(quinoline-2-carboxylato-κ2N,O)nickel(II)
Juhye Kang,Jin Kie Yeo,Pan-Gi Kim,Cheal Kim
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811041134
Abstract: In the title complex, [Ni(C10H6NO2)2(CH3OH)2], the NiII ion lies on an inversion center and is coordinated by two quinoline-2-carboxylate ligands in the equatorial sites and two axial methanol ligands, forming a distorted octahedral environment. In the crystal, molecules are linked via O—H...O hydrogen bonds into a two-dimensional network parallel to (10overline{1}).
Genetic Approach to Elucidation of Sasang Constitutional Medicine
Bu-Yeo Kim,Seongwon Cha,Hee-Jeong Jin,Sangkyun Jeong
Evidence-Based Complementary and Alternative Medicine , 2009, DOI: 10.1093/ecam/nep058
Abstract: Sasang Constitutional Medicine (SCM) offers a medical principle that classifies humans into four constitution groups and guides their treatment with constitution-matched medical assistance. The principle of this traditional medicine, although requires significant scientific support, appears to suggest a genetic influence on constitution type. The relative frequency of constitution types in a population, for instance, has remained relatively constant since Jema Lee first described them from his observations. In addition, the body compartment concept of SCM appears to be related to the anterio–posterior patterning of the embryonic gut and associated internal organs. This study describes the attributes of the constitution concept of SCM that can be interpreted in the language of genetics and current approaches to identity the genetic factors that make up the constitution. These efforts should make it possible to interpret the principle of this traditional medicine scientifically. Considering the recent trend in medicine that pursues individualized or tailored medical offerings, once SCM is proven to be explainable with scientific evidence, it will be able to contribute to and take a place in the rapidly evolving medicine environment.
Characterization of Incidental Liver Lesions: Comparison of Multidetector CT versus Gd-EOB-DTPA-Enhanced MR Imaging
Yong Eun Chung, Myeong-Jin Kim, Yeo-Eun Kim, Mi-Suk Park, Jin Young Choi, Ki Whang Kim
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0066141
Abstract: As a result of recent developments in imaging modalities and wide spread routine medical checkups and screening, more incidental liver lesions are found frequently on US these days. When incidental liver lesions are found on US, physicians have to make a decision whether to just follow up or to undergo additional imaging studies for lesion characterization. In order to choose the next appropriate imaging modality, the diagnostic accuracy of each imaging study needs to be considered. Therefore, we tried to compare the accuracy of contrast-enhanced multidetector CT (MDCT) and Gd-EOB-DTPA-enhanced MRI for characterization of incidental liver masses. We included 127 incidentally found focal liver lesions (94 benign and 33 malignant) from 80 patients (M:F = 45:35) without primary extrahepatic malignancy or chronic liver disease. Two radiologists independently reviewed Gd-EOB-DTPA-enhanced MRI and MDCT. The proportion of confident interpretations for differentiation of benign and malignant lesions and for the specific diagnosis of diseases were compared. The proportion of confident interpretations for the differentiation of benign and malignant lesions was significantly higher with EOB-MRI(94.5%–97.6%) than with MDCT (74.0%–92.9%). In terms of specific diagnosis, sensitivity and accuracy were significantly higher with EOB-MRI than with MDCT for the diagnosis of focal nodular hyperplasia (FNH) and focal eosinophilic infiltration. The diagnoses of the remaining diseases were comparable between EOB-MRI and MDCT. Hence, our results suggested that Gd-EOB-MRI may provide a higher proportion of confident interpretations than MDCT, especially for the diagnosis of incidentally found FNH and focal eosinophilic infiltration.
Determination of $B_K$ using improved staggered fermions (III) Finite volume effects
Boram Yoon,Taegil Bae,Hyung-Jin Kim,Jangho Kim,Jongjeong Kim,Kwangwoo Kim,Weonjong Lee,Chulwoo Jung,Stephen R. Sharpe,Jisoo Yeo
Physics , 2009,
Abstract: We study the finite-volume effects in our calculation of $B_K$ using HYP-smeared improved staggered valence fermions. We calculate the predictions of both SU(3) and SU(2) staggered chiral perturbation theory at one-loop order. We compare these to the results of a direct calculation, using MILC coarse lattices with two different volumes: $20^3$ and $28^3$. From the direct calculation, we find that the finite volume effect is $\approx 2%$ for the SU(3) analysis and $\approx 0.9%$ for the SU(2) analysis. We also show how the statistical error depends on the number of measurements made per configuration, and make a first study of autocorrelations.
Experimental Study on the Flow Characteristics around the Refraction Groyne  [PDF]
Joongu Kang, Hongkoo Yeo, Sungjung Kim
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.38103
Abstract: The refraction groyne is a complex structure consisted with groyne and groyne’s arm. This study conducted a experiment on the flow influences around the refraction groyne due to changes in the arm angle (θ) and length (AL). Results of experiment were analyzed on the impacts of the refraction groyne according to the projection length (L’). Velocity increase in main channel occurred greater the upward groynes than downward groynes. The vortices occurring at recirculation area of the upward and downward refraction groynes were formed in different shapes. The thalweg height did not have great impact vis-a-vis the extended arm length ratio and refraction angle change. The length of the recirculation area showed a gradual uptrend as the arm length of the groyne increased. Such area was formed at the range of 29% - 47%. For the length of the recirculation area, it was observed to be 10.2 - 14.7 times (URG), 8.4 - 12.7 times (DRG), and 10.6 - 13.8 times (right angle groyne) the projection length (L’) incensement.
Experimental Study on Local Scour in the Downstream Area of Low Drop Structure Types  [PDF]
Changsung Kim, Joongu Kang, Hongkoo Yeo
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.48060
Abstract: Although ecologically disadvantageous since a river is interrupted because of drop structure installation, such structure installation is also deemed ecologically advantageous in terms of scour and complex flows in the direct downstream area. This study started from the premise that scour hole carries value as a habitat and sought to analyze quantitatively the local scour adjustment possibility in the downstream area through drop structure type change and to offer a habitat through scouring. This study provided changes in drop structure types, such as straight line type and V type. For local scour analysis impacting the downstream area by drop structure type, quantitative analysis of scour scope, depth, and length was comparatively performed for a tentative physical habitat through hydraulic experiments. As a result of the experiments, this study found that scour scope increases and various water depth conditions are offered as the angle of the drop structure’s apex becomes smaller. Future studies accompanied by various fish habitation evaluations are considered useful in finding an alternative to upgrade the ecological environment.
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