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Search Results: 1 - 10 of 30954 matches for " Chan Woo Lee "
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Fabrication of Transparent Conducting Electrode Pattern by Metal Mesh Method on Stretchable Film Substrate  [PDF]
Gun-Woo Lee, Dock Young Lee, Byung Chan Lee, Kyungha Baek, Genggongwo Shi, Jeseob Kim, Lee Soon Park, Su Yong Nam
Materials Sciences and Applications (MSA) , 2019, DOI: 10.4236/msa.2019.105029
Abstract: Smart phones have become one of major electronic devices for human being. The easy and rapid exchange of information between man and machine is carried out by the touch screen panel (TSP) installed in the smart phones. Currently the smart phones are widely spread out while displays for automobiles are in the initial stage of developments. Since the automobile displays should fit the curved area of indoor space of the vehicle, the TSPs for automobiles need to be fabricated on the flexible and stretchable substrate film. In this study, we selected the thermo-plastic polyurethane film as the substrate film and examined the materials and process for fabrication of metal mesh type transparent conducting electrode films suitable for TSPs of automobile displays. The optimum UV resin system was established by the evaluation of various UV resin formulations in the UV imprinting process to make 3 × 3.5 μm trench patterns on the metal mesh type electrode film utilizing the embossed metal mask plate. The Ag paste has also been prepared by synthesis of Ag nanoparticles and formulation with the binder polymers. The inlay (filling) of Ag paste in the trench layer of transparent electrode film showed that the variation of electrical resistance was within 10% upon bending up to 100,000 times to radius of 3 mm.
Dramatic Improvement of Long Lasting Post-Inflammatory Hyperpigmentation by Oral and Topical Tranexamic Acid  [PDF]
Jae Kyung Kim, Sung Eun Chang, Chong Hyun Won, Mi Woo Lee, Jee Ho Choi, Kee Chan Moon
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2012, DOI: 10.4236/jcdsa.2012.22014
Abstract: Post-inflammatory hyperpigmentation is common problem, but its treatment still remains challenging. Tranexamic acid has been used to treat or prevent excessive bleeding loss in various medical conditions. There have been some reports of the effect of oral and topical tranexamic acid for treatment of pigmented disorder. Herein we report on a case of female patient who showed improvement of PIH after oral and topical tranexamic acid administration.
Characterization of Sol-Gel Derived Antimony-doped Tin Oxide Thin Films for Transparent Conductive Oxide Application
Dong Chan Woo,Chang Young Koo,Hong Chan Ma,Hee Young Lee
Transactions on Electrical and Electronic Materials , 2012,
Abstract: Antimony doped tin oxide (ATO) thin films on glass substrate were prepared by the chemical solution deposition(CSD) method, using sol-gel solution synthesized by non-alkoxide precursors and the sol-gel route. The crystallinityand electrical properties of ATO thin films were investigated as a function of the annealing condition (bothannealing environments and temperatures), and antimony (Sb) doping concentration. Electrical resistivity, carrierconcentration, Hall mobility and optical transmittance of ATO thin films were improved by Sb doping up to 5~8 mol%and annealing in a low vacuum atmosphere, compared to the undoped tin oxide counterpart. 5 mol% Sb doped ATOfilm annealed at 550℃ in a low vacuum atmosphere showed the highest electrical properties, with electrical resistivityof about 8~10 × 10-3 Ω·cm, and optical transmittance of ~85% in the visible range. Our research demonstrates thefeasibility of low-cost solution-processed transparent conductive oxide thin films, by controlling the appropriatedoping concentration and annealing conditions.
Bubble and Heat Transfer Phenomena in Viscous Slurry Bubble Column  [PDF]
Hyo Sik Kim, Jin Ho Kim, Chan Gi Lee, Suk Hwan Kang, Kwang Jae Woo, Ho Jin Jung, Dong Wook Kim
Advances in Chemical Engineering and Science (ACES) , 2014, DOI: 10.4236/aces.2014.44046
Abstract: Heat transfer and bubble phenomena were investigated by adopting the drift flux model in a viscous slurry bubble column reactor (SBCR), having a diameter of 0.0508 m(ID) and height 1.5 m. The effects of superficial gas velocity (0.002 -0.164 m/s), solid concentration (0 - 20 wt%) and liquid viscosity (paraffin oil; 16.9 mPas and squalane; 25.9 mPas) on the gas holdup and heat transfer characteristics were examined. It was observed that the gas holdup increased with increasing superficial gas velocity (UG), but decreased with increasing solid concentration (SC) or slurry viscosity. The degree of non-uniformity in a SBCR could be determined by the modified drift flux model at the heterogeneous flow regime. The local heat transfer coefficient (h) between the immersed heater and the bed decreased with increasing liquid viscosity and SC, but it increased with increasing UG. The modified Nusselt number including the gas holdup and local heat transfer coefficient was well correlated in terms of dimensionless groups such as Reynolds and Prandtl numbers.
Evaluation of the Surface of Nitinol after MR Polishing Process  [PDF]
Byung-Chan Kim, Jung-Won Lee, Seok-Jae Ha, Yong-Kyu Cho, Dong-Sung Kang, Myeong-Woo Cho
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.32031
Abstract:

Nitinol is used in various industries, especially for biomaterials. Generally, the surface integrity of sub-micron level and non-surface flaw is required in nitinol for biomaterial. However, surface flaws, such as scratches, pits, and residual stress, can occur on the polished surface, and it is difficult to remove these surface flaws. The corrosion is accelerated continuously and causes bad influence in the body. Therefore, in this study, conventional polishing and MR polishing were used to minimize the corrosion and residual stress when the nitinol is used as biomaterial. X-ray diffraction and Tafel extrapolation were used to investigate the residual stress and the corrosion, and the strain hardening was investigated by nanoindentation. Surface integrities were also evaluated by SEM image and surface roughness results. As a result, the increased residual stress in conventional polishing was decreased by MR polishing. The result of corrosion test was improved from ?301 mV to ?280 mV. The residual stress was improved from ?38.18 MPa to ?31.17 MPa. Finally, it is certified that MR polishing can be used to minimize surface flaws and to improve the corrosion properties.

Characteristics of the Aragonitic Layer in Adult Oyster Shells, Crassostrea gigas: Structural Study of Myostracum including the Adductor Muscle Scar
Seung-Woo Lee,Young-Nam Jang,Jeong-Chan Kim
Evidence-Based Complementary and Alternative Medicine , 2011, DOI: 10.1155/2011/742963
Abstract: Myostracum, which is connected from the umbo to the edge of a scar, is not a single layer composed of prismatic layers, but a hierarchically complex multilayered shape composed of minerals and an organic matrix. Through the analysis of the secondary structure, the results revealed that a -antiparallel structure was predominant in the mineral phase interface between the myostracum (aragonite) and bottom folia (calcite). After the complete decalcification and deproteinization, the membrane obtained from the interface between the myostracum buried in upper folia, and the bottom folia was identified as chitin. The transitional zone in the interface between the adductor muscle scar and folia are verified. The myostracum disappeared at the edge of the scar of the posterior side. From this study, the entire structure of the myostracum from the adult oyster shell of Crassostrea gigas could be proposed.
“Early Rupture of Membranes” during Induced Labor as a Risk Factor for Cesarean Delivery in Term Nulliparas
Seung Mi Lee, Jeong Woo Park, Chan-Wook Park, Bo Hyun Yoon
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0039883
Abstract: Objective To determine if “early rupture of membranes” (early ROM) during induction of labor is associated with an increased risk of cesarean section in term nulliparas. Study Design The rate of cesarean section and the timing of ROM during the course of labor were examined in term singleton nulliparas whose labor was induced. Cases were divided into 2 groups according the timing of ROM: 1)“early ROM”, defined as ROM at a cervical dilatation<4 cm during labor; and 2) “late ROM”, ROM at a cervical dilatation≥4 cm during labor. Nonparametric techniques were used for statistical analysis. Results 1) In a total of 500 cases of study population, “early ROM” occurred in 43% and the overall cesarean section rate was 15.8%; 2) patients with “early ROM” had a higher rate of cesarean section and cesarean section due to failure to progress than did those with “late ROM” (overall cesarean section rate: 24%[51/215] vs. 10%[28/285], p<0.01; cesarean section rate due to failure to progress: 18%[38/215] vs. 8%[22/285], p<0.01 for each) and this difference remained significant after adjusting for confounding variables. Conclusion “Early ROM” during the course of induced labor is a risk factor for cesarean section in term singleton nulliparas.
Genome-wide genetic aberrations of thymoma using cDNA microarray based comparative genomic hybridization
Gui Lee, Woo Yang, Hei Jeung, Sang Kim, Min Seo, Chan Park, Hyun Chung, Sun Rha
BMC Genomics , 2007, DOI: 10.1186/1471-2164-8-305
Abstract: We investigated the molecular characteristics of genetic changes variation of thymoma using cDNA microarray based-comparative genomic hybridization (CGH) with a 17 K cDNA microarray in an indirect, sex-matched design. Genomic DNA from the paraffin embedded 39 thymoma tissues (A 6, AB 11, B1 7, B2 7, B3 8) labeled with Cy-3 was co-hybridized with the reference placenta gDNA labeled with Cy-5. Using the CAMVS software, we investigated the deletions on chromosomes 1, 2, 3, 4, 5, 6, 8, 12, 13 and 18 throughout the thymoma. Then, we evaluated the genetic variations of thymoma based on the subgroups and the clinical behavior. First, the 36 significant genes differentiating five subgroups were selected by Significance Analysis of Microarray. Based on these genes, type AB was suggested to be heterogeneous at the molecular level as well as histologically. Next, we observed that the thymoma was divided into A, B (1, 2) and B3 subgroups with 33 significant genes. In addition, we selected 70 genes differentiating types A and B3, which differ largely in clinical behaviors. Finally, the 11 heterogeneous AB subtypes were able to correctly assign into A and B (1, 2) types based on their genetic characteristics.In our study, we observed the genome-wide chromosomal aberrations of thymoma and identified significant gene sets with genetic variations related to thymoma subgroups, which might provide useful information for thymoma pathobiology.Thymoma is a thymic epithelial cell tumor having organotypic features and no overt cytologic atypia. Although controversy still remains, the classical histological classifications of thymoma based on the proportion of reactive lymphocytes and tumor epithelial cells have been replaced by a histogenetic classification that basically subdivides thymoma into medullary, cortical, and mixed types, according to cytological features of epithelial cells [1-5]. Several studies supported the validity of the histogenetic classification and the World Health Org
Successional Changes in Seed Banks in Abandoned Rice Fields in Gwangneung, Central Korea
Lee, Seon Mi,Yong Chan Cho,Hyun Chul Shi,Woo Seok Oh
Journal of Ecology and Field Biology , 2008,
Abstract: In order to understand the role of seed banks for restoration, seed banks in abandoned rice fieldsin the Gwangneung National Arboretum, central Korea were investigated using the seedling emergence method.The study sites represented three stages: an initial stage dominated by forbs such as Persicaria thunbergii andJuncus effuses var. decipiens, a middle stage dominated by Salix, and a late stage dominated by Quercus alienaand Prunus padus (in nearby riparian forest chosen as a reference stand). DCA ordination arranged the standsaccording to the number of years since abandonment. CCA ordination identified the dominant environmentalvariables correlated most closely with Axes 1 and 2 as Mg2+ (intraset correlation was 0.827) and K+ (intrasetcorrelation was -0.677), respectively. Species richness and diversity decreased from the initial stage (H'=2.61)to the middle (H'=1.79) and late (H'=0.75) stages. A total of 49 species (/m2) and 18,620 seedlings (/m2) emergedout of the seed bank samples. The DCA ordination and similarity analysis detected a large discrepancy betweenthe composition of the actual vegetation and the seed bank. We conclude that the contribution of seed bankto restoration is low. However, seed bank may help the recovery of forbs after disturbance. Some of our resultsare consistent with the tolerance model of succession whereas others follow the trajectory of the facilitationmodel. More research on succession will be required to understand the underlying mechanisms.
A Method for Assaying Deubiquitinating Enzymes
Lee Jae Il,Woo Seung Kyoon,Kim Keun Il,Park Kyung Chan
Biological Procedures Online , 1998, DOI: 10.1251/bpo11
Abstract: A general method for the assay of deubiquitinating enzymes was described in detail using 125I-labeled ubiquitin-fused &agr;NH-MHISPPEPESEEEEEHYC (referred to as Ub-PESTc) as a substrate. Since the tyrosine residue in the PESTc portion of the fusion protein was almost exclusively radioiodinated under a mild labeling condition, such as using IODO-BEADS, the enzymes could be assayed directly by simple measurement of the radioactivity released into acid soluble products. Using this assay protocol, we could purify six deubiquitinating enzymes from chick skeletal muscle and yeast and compare their specific activities. Since the extracts of E. coli showed little or no activity against the substrate, the assay protocol should be useful for identification and purification of eukaryotic deubiquitinating enzymes cloned and expressed in the cells.
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