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Expression patterns of bisphenol A - exposed medaka fish(O. latipes) analyzed with a cDNA microarray
Chulwoo Lee,Eun-Hye Jo,Jisung-Ryu,Eung-Roh Park,Kyung-Tae Kim,Eun-Kyoung Kim,Hyun-Mi Kim,Kyunghee Choi 한국보건교육건강증진학회 2007 한국보건교육·건강증진학회 학술대회 발표논문집 Vol.- No.-
Changes in gene expression in the liver of medaka fish (Oryzias latipes) in response to bisphenol A were investigated with a microarray consisting of medaka-specific cDNA probes. Upon exposure to bisphenol A at three different concentrations (0.02, 0.2 and 2㎎/L) for 6 days, we found the different genes that were up- or down-regulated with statistically significant changes. Vitellogenin and choriogenin subtype genes were up-regulated, but annexin and some regulation factors were down-regulated. Our results suggest that this medaka chip microarray would be useful to generate gene expression profiles for toxicogenomics studies using fish.
Contrast Enhancement Based on Layered Difference Representation of 2D Histograms
Chulwoo Lee,Chul Lee,Chang-Su Kim IEEE 2013 IEEE TRANSACTIONS ON IMAGE PROCESSING - Vol.22 No.12
<P>A novel contrast enhancement algorithm based on the layered difference representation of 2D histograms is proposed in this paper. We attempt to enhance image contrast by amplifying the gray-level differences between adjacent pixels. To this end, we obtain the 2D histogram h(k, k+l) from an input image, which counts the pairs of adjacent pixels with gray-levels k and k+l, and represent the gray-level differences in a tree-like layered structure. Then, we formulate a constrained optimization problem based on the observation that the gray-level differences, occurring more frequently in the input image, should be more emphasized in the output image. We first solve the optimization problem to derive the transformation function at each layer. We then combine the transformation functions at all layers into the unified transformation function, which is used to map input gray-levels to output gray-levels. Experimental results demonstrate that the proposed algorithm enhances images efficiently in terms of both objective quality and subjective quality.</P>
Lee, Tae Hyun,Do, Kwangseok,Lee, Young Woo,Jeon, Sang Soo,Kim, Chulwoo,Ko, Jaejung,Im, Seung Soon The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.40
<P>Poly(3,4-ethylenedioxythiophene) nanofibers (PEDOT-NFs) with 10–50 nm diameters and high electrical conductivity (up to 83 S cm<SUP>−1</SUP>) have been fabricated chemically within micelles composed of sodium dodecyl sulfate (SDS) as nanoreactors. Dimethyl sulfoxide (DMSO, 5 wt%) was added to a methanol-based colloidal dispersion containing PEDOT-NFs to improve dispersibility. The dye-sensitized solar cells (DSSCs) using PEDOT-NFs as a counter electrode (CE) with low surface resistance and a highly porous surface exhibited enhanced power conversion efficiency (9.2%) compared to bulk PEDOT (6.8%). To date, PEDOT-NFs have shown the highest performance among CEs using PEDOT. It also surpassed the efficiency of platinum (Pt) CEs (8.6%). Electrochemical characterization, such as cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), showed that PEDOT-NFs efficiently reduced triiodide due to the enhanced electrical and morphological properties, which contributed to the high current density (17.5 mA cm<SUP>−2</SUP>) and fill factor (72.6%).</P> <P>Graphic Abstract</P><P>Dye-sensitized solar cells (DSSCs) using poly(3,4-ethylenedioxythiophene) nanofibers as counter electrodes showed enhanced overall power conversion efficiency (9.2%) compared to conventional platinum-based DSSCs (8.6%). <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm34807a'> </P>
Lee, Wonsup,Lee, Baekhee,Yang, Xiaopeng,Jung, Hayoung,Bok, Ilgeun,Kim, Chulwoo,Kwon, Ochae,You, Heecheon Elsevier 2018 COMPUTERS & INDUSTRIAL ENGINEERING Vol.117 No.-
<P><B>Abstract</B></P> <P>The present study developed a sizing analysis system for head-related product designs based on the Civilian American and European Surface Anthropometry Resource (CAESAR) database of North Americans. A total of 2299 heads in the CAESAR database were manually edited and 26 anthropometric landmarks were marked on the edited 3D heads to measure 30 anthropometric dimensions related to head-related product designs. The 3D anthropometric sizing analysis system (3D-ASAS) developed in the study provides analysis functions of a sizing system and representative face models by considering a target product, a target population, the number of size categories, and key anthropometric dimensions based on the CAESAR head measurements. Further research to reduce the efforts of manual editing and landmarking of 3D body scan data is discussed for efficient application of the 3D-ASAS to the design process of various wearable products.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 2299 heads of the Civilian American and European Surface Anthropometry Resource (CAESAR) were edited for measurement. </LI> <LI> 30 anthropometric head and face dimensions were measured. </LI> <LI> A 3D Anthropometric Sizing Analysis System (3D-ASAS) was developed and applied in head-wearable product design. </LI> <LI> A sizing system of a head-wearable product can be easily found by product designers through simple use of the 3D-ASAS. </LI> </UL> </P>