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Search Results: 1 - 10 of 8150 matches for " Byung Park "
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Characteristics of Eu2+, Dy3+-Doped SrAl2O4 Synthesized by Hydrothermal Reaction and Its Photocatalytic Properties  [PDF]
Byung-Geon Park
Journal of Materials Science and Chemical Engineering (MSCE) , 2018, DOI: 10.4236/msce.2018.62002
Abstract: Eu2+, Dy3+-doped SrAl2O4 was prepared by a hydrothermal reaction through the process of calcination at lower temperature. The physicochemical properties of the SrAl2O4: Eu2+, Dy3+ phosphor were characterized and compared to those of the SrAl2O4: Eu2+, Dy3+ prepared by sol-gel method. The photocatalytic properties of the SrAl2O4: Eu2+, Dy3+ were evaluated in photocatalytic water decomposition for hydrogen production. The SrAl2O4: Eu2+, Dy3+ prepared by hydrothermal reaction exhibited excellent phosphor properties which were similar with that prepared by sol-gel method. Its photocatalytic activity for hydrogen evolution was higher than that of TiO2 photocatalyst.
Effect of Oral Administration of Jerusalem Artichoke Inulin on Reducing Blood Lipid and Glucose in STZ-Induced Diabetic Rats
Park Byung-Sung
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2011.2501.2507
Abstract: This study was carried out to investigate the effect of inulin extracted from Jerusalem artichoke (Helianthus tuberosus) on decrease of blood lipids and blood glucose in STZ-induced diabetic rats. The oral administration of inulin decreased blood lipids and blood glucose, implying the utility of artichoke-extracted inulin as a bioactive material to prevent metabolic diseases related to blood lipids and blood glucose of humans. Twenty four white rats were completely randomly allocated into four treatment groups with six rat per group and inulin was orally administrated to them. The experimental treatment groups were divided into one Normal Control group (NC) and three diabetic groups. The diabetic groups consisted of DC (diabetic control group), DC 50 (diabetic control group+oral administration of inulin, 50 mg kg-1 body weight) and DC 100 (diabetic control group+oral administration of inulin, 100 mg kg-1 body weight). Concerning growth performance, in comparison with the DC group, daily weight gain in the inulin-administered rats increased and recovered to the normal level. The diet intake was significantly low in the inulin-administrated groups (p<0.05) while statistically significant difference in the dietary efficiency between the DC and the inulin-administrated groups and between NC and the inulin-administrated groups was not found. Blood glucose was significantly lowered in the inulin-administrated groups (p<0.05). Compared with DC, the decrease of blood glucose in the inulin-administrated groups was 60.73-63.4% in the 4th week and showed a tendency of gradual recovery. Triacylglycerides in the blood, total cholesterol, LDLC and atherogenic index were significantly decreased by 27.13-32.91, 22.42-23.31, 35.41-38.28 and 49.71-57.11%, respectively in the inulin-administrated groups compared to the DC group. Conversely, HDLC was significantly increased by 24.89-47.20% (p<0.05). The weights of liver, kidney and heart but not the spleen were significantly heavy in the DC group, compared with the inulin-administrated groups (p<0.05).
Influence of Dietary Vegetable Wasps with Fly Pupa on Gastrointestinal Tract Microflora, Carcass Characteristics and Growth Performance in Broiler Chickens
Park Byung-Sung
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2011.2930.2935
Abstract: This study evaluated the effects of the addition of different levels of VWFP (Vegetable Wasps with Fly Pupa) on the growth performance, carcass characteristics and gastrointestinal microorganism populations of broiler chickens. About 400 animals (Ross 308, 1 day old) with an average body weight of 45 g were sorted randomly into 4 treatment groups and 4 repetition groups of 25 animals each. The treatment groups were divided into a control group not fed with VWFP and treatment groups fed with VWFP 2.0, 3.5 and 5.0%. The feeding test lasted 5 weeks separated by the grower period (0-21 days) and the finisher period (22-35 days). Although, the broilers weight gain and feed efficiency were significantly higher in the VWFP 3.5% (p<0.05) group throughout the entirety of the test period, no statistically significant differences were noted between the control group and other treatment groups. Triglyceride in the blood, total cholesterol and LDL-C were significantly lower in the VWFP treatment groups than in the control group (p<0.05). The blood lipid reduction rate ranged from 5.32-10.63% for triglycerides from 9.23-2.62% for total cholesterol and from 44.67-53.81% for LDL-C in the VWFP treatment groups relative to the control group. The abdominal fat weight ratio was reduced significantly in the VWFP treatment groups (p<0.05) compared with the control group with a reduction rate range of 17.67-21.68%. Broiler carcass weight, carcass rate and breast muscle, skin and thigh muscle weights against carcass weight were significantly higher in the VWFP 3.5% treatment group and a statistically significant difference was noted between the control group and other treatment groups (p<0.05). Enteropathogenic E. coli and Salmonella were lower in the VWFP treatment groups than in the control group whereas the beneficial bacteria Bifidobacteria were significantly higher in the VWFP treatment groups than in the control group (p<0.05).
Polymyxin B Alleviates Angiotensin II-Induced Stress Fiber Formation and Cellular Hypertrophy  [PDF]
Kwang-Seok Oh, Jeong Hyun Lee, Byung Koo Oh, Jihye Mun, Byung Kil Park, Byung Ho Lee
Pharmacology & Pharmacy (PP) , 2014, DOI: 10.4236/pp.2014.59101

Polymyxin B is widely used antibiotic in the clinic for resistant Gram-negative infections. In addition, polymyxin B-immobilized hemoperfusion cartridge has been used for endotoxin removal therapy in patients with septic shock. The aim of this study was to investigate the anti-fibrotic and anti-cellular hypertrophic effects of polymyxin B, and further to explore its possible mechanism. Polymyxin B (3, 10 μM) significantly inhibited stress fiber formation induced by angiotensin II (Ang II) in rat heart-derived H9c2 cells. Furthermore, polymyxin B (1 - 10 μM) showed a potent inhibitory effect on Ang II-induced cellular hypertrophy in H9c2 cells. Under the mechanism study, the inhibitory activities of polymyxin B against kinases involved in cellular hypertrophy such as AKT1, CAMK, GRK5, GSK3β, MLCK, PKC, PKD2, AMPK, ROCK2, p70S6K, SGK1were evaluated. Polymyxin B possesses a potent G protein related kinase 5 (GKR5) inhibitory activity with IC50 value of 1.1 μM, and has an ATP non-competitive inhibitory mode. Taken together, these results indicate that polymyxin B alleviates Ang II-induced stress fiber formation and cellular hypertrophy, and propose that one mechanism underlying these effects involves inhibition of the GRK5 pathway.

Short Communication—A Novel Sample Preparation Method That Enables Ultrathin Sectioning of Urea-Formaldehyde Resin for Imaging by Transmission Electron Microscopy  [PDF]
Adya P. Singh, Arif Nuryawan, Byung- Dae Park
Microscopy Research (MR) , 2013, DOI: 10.4236/mr.2013.11001
Abstract: Urea-formaldehyde (UF) resin is widely used as an adhesive for the manufacture of a range of wood and fiber based products. Although the microstructure of this resin has been examined at high resolution by field-emission scanning electron microscopy and atomic force microscopy, transmission electron microscopy (TEM) has thus far not been used, perhaps because of difficulties in ultrathin sectioning this resin in cured (polymerized) state. In the technical note presented here, a novel sample preparation method is described which enabled us to examine the microstructural morphology of UF resin by transmission electron microscopy in ultrathin sections, revealing the presence of spherical particles within the resin. Our initial attempt to ultrathin section the resin directly was not successful as it was too brittle to trim blocks for sectioning. Then, we developed a sample preparation technique that involved impregnation ofPinus radiatawood tissues with the UF resin, and then embedding of resin impregnated wood tissues with Spurr’s low viscosity embedding medium, which has been widely employed in plant and wood ultrastructure work. The TEM images illustrated and the information on the microstructural morphology of the UF resin presented are based on this novel sample preparation approach.
Balancing false discovery and false negative rates in selection of differentially expressed genes in microarrays
Byung S Park, Motomi Mori
Open Access Bioinformatics , 2010, DOI: http://dx.doi.org/10.2147/OAB.S7181
Abstract: alancing false discovery and false negative rates in selection of differentially expressed genes in microarrays Methodology (3439) Total Article Views Authors: Byung S Park, Motomi Mori Published Date February 2010 Volume 2010:2 Pages 1 - 9 DOI: http://dx.doi.org/10.2147/OAB.S7181 Byung S Park1,2,3, Motomi Mori1,2,3 1Division of Biostatistics, Department of Public Health and Preventive Medicine, 2Biostatistics Shared Resource, Knight Cancer Institute, 3Biostatistics and Design Program, Oregon Clinical and Translational Science Institute, Oregon Health and Science University, Portland, OR, USA Abstract: Genome-wide mRNA expression profiling using microarrays is widely available today, yet analysis and interpretation of the resulting high dimensional data continue to be a challenge for biomedical scientists. In a typical microarray experiment, the number of biological samples is quite modest compared with the number of genes on a microarray, and a probability of falsely declaring differential expression is unacceptably high without any adjustment for multiple comparisons. However, a stringent multiple comparison procedure can lead to an unacceptably high false negative rate, potentially missing a large fraction of truly differentially expressed genes. In this paper we propose a new “balancing factor score” (BFS) method for identifying a set of differentially expressed genes. The BFS method combines a traditional P value criterion with any other informative factors (referred to as balancing factors) that may help to identify differentially expressed genes. We evaluate the performance of the BFS method when the observed fold change is used as a balancing factor in a simulation study and show that the BFS method can substantially reduce the false negative rate while maintaining a reasonable false discovery rate.
On the structure of braid groups on complexes
Byung Hee An,Hyo Won Park
Mathematics , 2015,
Abstract: We consider the braid groups $\mathbf{B}_n(X)$ on finite simplicial complexes $X$, which are generalizations of those on both manifolds and graphs that have been studied already by many authors. We figure out the relationships between geometric decompositions for $X$ and their effects on braid groups, and provide an algorithmic way to compute the group presentations for $\mathbf{B}_n(X)$ with the aid of them. As applications, we give complete criteria for both the surface embeddability and planarity for $X$, which are the torsion-freeness of the braid group $\mathbf{B}_n(X)$ and its abelianization $H_1(\mathbf{B}_n(X))$, respectively.
Fatigue Performance of Precast FRP-Concrete Composite Deck with Long Span  [PDF]
Keunhee Cho, Sung Yong Park, Sung Tae Kim, Jeong-Rae Cho, Byung-Suk Kim
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.311139
Abstract: The fatigue performance of precast FRP-concrete composite (PFC) deck is evaluated. This type of deck enables a reduction of the weight by 30% compared to conventional reinforced concrete decks owing to the composition of a hollow FRP panel with concrete. Therefore, the application of such deck in cable-stayed bridge will reduce effectively the weight of the superstructure leading also to substantial savings in the materials required for the superstructure and substructure and, therefore, achieve significant improvement of the economic efficiency. Static, pulsating fatigue and rolling fatigue tests were carried out on 4 m × 4 m precast FRP-concrete composite decks. All the specimens did not fail even after 2 million fatigue cycles, and the subsequent static tests conducted on these specimens verified that all the design criteria were satisfied. These experimental results demonstrated that the PFC deck developed in this research secures sufficient performances for future applications for cable-stayed bridges.
Advances in Probing Wood-Coating Interface by Microscopy: A Review  [PDF]
Adya P. Singh, Byung-Dae Park, Arif Nuryawan, Menda Kazayawoko
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2013, DOI: 10.4236/jsemat.2013.31A007

Surface coatings provide protection to wood products against weathering and other deteriorating factors, such as moisture uptake and microbial invasion. The effectiveness of coatings depends on many factors, including how well the applied coatings adhere to the wood surface. Coating adhesion to wood involves both chemical and physical interactions between the coating and wood tissues in contact, and the particular focus of this mini-review will be on the advances being made in understanding the physical aspects of the interaction by probing wood-coating interface using novel and high resolution imaging techniques, including confocal laser scanning microscopy (CLSM), SEM-backscattered electron imaging and correlative microscopy employing light, confocal and scanning electron microscopy.

Freeze-Thaw Effect on Coarse Sand Coated Interface between FRP and Concrete  [PDF]
Keunhee Cho, Sung Yong Park, Sung Tae Kim, Jeong-Rae Cho, Byung-Suk Kim
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510097

This paper examines the effect of freezing and thawing on the coarse sand coating chosen to achieve the composition of FRP and concrete in FRP-concrete composite deck. Push-out test specimens with dimensions of 100 × 100 × 450 mm were subjected to repeated freeze-thaw cycles under wet conditions ranging from -18± 2to 4 ± 2. The failure strength of the interface and the deformation of FRP at failure exhibited by the specimens that experienced 300 freezing-thawing cycles showed a difference of merely 5% compared to those of the specimens that were not subjected to freeze-thaw. This indicates that coarse sand coating is not affected by freezing-thawing cycles and the FRP-concrete composite deck owns sufficient applicability in terms of durability against freezing-thawing.

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