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Search Results: 1 - 10 of 34080 matches for " Jin Soon Park "
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Canopy Net Photosynthesis Rate of a Mongolian Oak (Quercus mongolica) Forest Estimated by Field Experimental Data  [PDF]
Seung Jin Joo, Soon-Ung Park
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.83027
Abstract: The canopy net photosynthesis rate of Mongolian oak (Quercus mongolica) tree species that are dominant in East Asia and Korea is estimated with empirical models derived from field experimental data obtained from the Nam-San site in Seoul, Korea for the growing period from early May to late October in 2010. The empirical models include the attenuation function of photosynthetic photon flux density (PPFD) (r2 = 0.98-0.99, p < 0.001) and the photosynthetic light response function (r2 = 0.99, p < 0.001) derived from the measured data at several levels within the canopy. The incident PPFD at each level within canopy significantly varies diurnally and seasonally due to the seasonal variation of the total plant area index (TPAI = leaf area index + wood silhouette area index) and the light shielding effect of light path-length through the canopy in association with the variation of solar elevation angle. Consequently, a remarkable seasonal variation of the total canopy net photosynthesis rate of Q. mongolica forest stand is found for its growing period. The PPFD exceeding 1000 μmol m-2·s-1 is found to cause the decrease of net photosynthesis rate due to the thermal stress in the early (May) and late (September) growing period. During the whole growing season, the estimated total canopy net photosynthesis rate is found to be about 3.3 kg CO2
Black Photoresist for Patterning Pixel Define Layer of Organic Light Emitting Diode with Polyimide as Thermal Stabilizer  [PDF]
Genggongwo Shi, Jin Woo Park, Lee Soon Park
Materials Sciences and Applications (MSA) , 2018, DOI: 10.4236/msa.2018.96040
Abstract: In order to improve the visibility for outside use of organic light emitting diodes (OLEDs), the polarized film and black matrix pattern have been used in the small and medium sized OLEDs; however, these cause problem of reducing the emission efficiency of OLED. Changing the color of pixel define layer (PDL) from brown to black is an important point for improving the efficiency and visibility of OLEDs. In this work we studied the photoresist material containing black pigment and the photolithographic process for patterning of black PDL on OLEDs. The black PDL patterns made with our synthesized polyimides as thermal stabilizer were found to give high thermal stability over 300°C.
Applications of Circular Dichroism for Structural Analysis of Gelatin and Antimicrobial Peptides
Ramamourthy Gopal,Jin Soon Park,Chang Ho Seo,Yoonkyung Park
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms13033229
Abstract: Circular dichroism (CD) is a useful technique for monitoring changes in the conformation of antimicrobial peptides or gelatin. In this study, interactions between cationic peptides and gelatin were observed without affecting the triple helical content of the gelatin, which was more strongly affected by anionic surfactant. The peptides did not adopt a secondary structure in the presence of aqueous solution or Tween 80, but a peptide secondary structure formed upon the addition of sodium dodecyl sulfate (SDS). The peptides bound to the phosphate group of lipopolysaccharide (LPS) and displayed an alpha-helical conformation while (KW) 4 adopted a folded conformation. Further, the peptides did not specifically interact with the fungal cell wall components of mannan or laminarin. Tryptophan blue shift assay indicated that these peptides interacted with SDS, LPS, and gelatin but not with Tween 80, mannan, or laminarin. The peptides also displayed antibacterial activity against P. a er uginosa without cytotoxicity against HaCaT cells at MIC, except for HPA3NT3-analog peptide. In this study, we used a CD spectroscopic method to demonstrate the feasibility of peptide characterization in numerous environments. The CD method can thus be used as a screening method of gelatin-peptide interactions for use in wound healing applications.
Willingness to Pay for the Subscription Fee of Public Broadcasting System  [PDF]
Inho Park, Hyun Soon Park
Advances in Journalism and Communication (AJC) , 2014, DOI: 10.4236/ajc.2014.21001
Abstract: The study aims at developing communication strategies for the public broadcasting system according to WTP (Willingness to Pay) for the subscription fee and the audience’s perception of the public broadcasting system as a public good. A quasi-experiment was conducted for audiences who have previously watched public broadcasting channels. According to the results, those respondents who think of public broadcasting as a public good and who think that public broadcasting performs its public role well have high intention to pay the subscription fee. Respondents feel at a loss when they pay the subscription fee, and the willingness to pay the fee goes down.
Nonlocal Controllability for the Semilinear Fuzzy Integrodifferential Equations in n-Dimensional Fuzzy Vector Space
Young Chel Kwun,Jeong Soon Kim,Min Ji Park,Jin Han Park
Advances in Difference Equations , 2009, DOI: 10.1155/2009/734090
Abstract: We study the existence and uniqueness of solutions and controllability for the semilinear fuzzy integrodifferential equations in n-dimensional fuzzy vector space (EN)n by using Banach fixed point theorem, that is, an extension of the result of J. H. Park et al. to n-dimensional fuzzy vector space.
Controllability for the Impulsive Semilinear Nonlocal Fuzzy Integrodifferential Equations in n-Dimensional Fuzzy Vector Space
Young Chel Kwun,Jeong Soon Kim,Min Ji Park,Jin Han Park
Advances in Difference Equations , 2010, DOI: 10.1155/2010/983483
Abstract: We study the existence and uniqueness of solutions and nonlocal controllability for the impulsive semilinear nonlocal fuzzy integrodifferential equations in n-dimensional fuzzy vector space (EN)n by using short-term perturbations techniques and Banach fixed point theorem. This is an extension of the result of Kwun et al. (Kwun et al., 2009) to impulsive system.
Serum Lipid Concentrations, Prevalence of Dyslipidemia, and Percentage Eligible for Pharmacological Treatment of Korean Children and Adolescents; Data from the Korea National Health and Nutrition Examination Survey IV (2007–2009)
Seung Yang, Jin Soon Hwang, Hong Kyu Park, Hae Sang Lee, Hae Soon Kim, Eun Young Kim, Jung Sub Lim
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0049253
Abstract: Objectives Dyslipidemia is one of the important modifiable risk factors for cardiovascular disease. Thus, to know the prevalence of dyslipidemia is the 1st step to make guidelines of screening and management plan. Although, American Academy of Pediatrics updated the guidelines for lipid in childhood, Asian study is rare. Methods The authors aimed to make a reference of each serum lipid level of Korean children and adolescents (2,363 subjects aged 10 to 18 years) from the data of Korea National Health and Nutrition Examination Survey IV (2007–2009). Results The mean serum concentrations for total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), triglycerides (TG), and high-density lipoprotein cholesterol (HDL-C) were 158 mg/dL, 90 mg/dL, 90 mg/dL, and 49 mg/dL, respectively. The 95th percentile values for TC, LDL-C, and TG were 203 mg/dL, 129 mg/dL, and 185 mg/dL, respectively. The 5th percentile value for HDL-C was 36 mg/dL. The prevalence of hypercholesterolemia, high LDL-C, high TG, and low HDL-C was 6.5%, 4.7%, 10.1%, and 7.1%, respectively. Considering the risk factors such as obesity, hypertension, smoking, and diabetes, approximately 0.41% of the subjects were potentially eligible for pharmacological treatment. Conclusions This information may be useful in not only Korean but also Asian planning programs for the prevention of cardiovascular disease through lipid control from childhood.
Development of cDNA-derived SSR markers and their efficiency in diversity assessment of Cymbidium accessions
Moe,Kyaw Thu; Hong,Woo-Ju; Kwon,Soon-Wook; Park,Yong-Jin;
Electronic Journal of Biotechnology , 2012,
Abstract: cymbidium spp. are popular ?owering plants. assessment of the genetic diversity in cultivated cymbidium facilitates conservation of germplasm and subsequent cultivar improvement. thus, it is important to develop more efficient polymorphic dna markers. although more motifs (403) were identified and more primers (206) were designed in the genomic library compared to the cdna library, a larger number of successful primers were obtained from the cdna library (59.9%) than from genomic dna library (51.1%). however, higher pic and gene diversity were identified in genomic ssrs. the average allele number per locus was also higher in genomic ssrs (7.3) than est-ssrs (5.2), among the 24 evaluated cymbidium accessions. at/ta was comparatively high in est-ssrs, while this motif was not as common in genomic ssrs. the ctt/aag/tct/aga/ttc/gaa and tgc/gca/gct/agc/ctg/cag motifs were the most abundant tri-nucleotide sequences in est-ssrs, while gtt/aac/tgt/aca/ttg/caa was the most frequent in genomic ssrs. the number of repeats ranged from 3 to 12 in est-ssrs. currently, 52 novel polymorphic ssr markers have been evaluated, which will be useful for germplasm assessments, core set construction, evaluation of genetic diversity, and marker assisted selection (mas) based cymbidium breeding.
CO2 flux in a cool-temperate deciduous forest (Quercus mongolica) of Mt. Nam in Seoul, Korea
Seung Jin Joo,Moon-Soo Park,Gyung Soon Kim,Chang Seok Lee
Journal of Ecology and Field Biology , 2011,
Abstract: The Namsan Ecological Tower Site based on a flux tower was equipped with eddy covariance and automatic opening/closing chamber systems to collect long-term continuous measurements of CO2 flux, such as the net ecosystem exchange(NEE) and soil CO2 efflux in a cool-temperate Quercus mongolica forest. The mean concentrations of atmosphericCO2 (705 mg/m3) during the summer were smaller than those measured (770 mg/m3) during the winter. The mean CO2flux during the summer period was negative (-0.34 mg m-2 s-1), while that during the winter period was positive (0.14 mgm-2 s-1). CO2 was deposited from the atmosphere to the surface in the summer. The daily mean value of soil CO2 effluxincreased from spring to summer. The seasonal pattern in the rate of soil CO2 efflux tightly followed the seasonal patternin soil temperatures. The Q10 values for soil CO2 efflux varied in a range from 2.12 to 3.26, and increased with increasingsoil depth. The maximum value of total carbon uptake (i.e., NEE) during the growing season was -8 g CO2 m-2 day-1. At thesame time, the rate of soil CO2 efflux was 6.9 g CO2 m-2 day-1. The amplitude of flux variations in NEE was approximately14% larger than those in soil CO2 efflux. These results suggest that in cool-temperate regions of the Korean peninsula,the forest ecosystem of Q. mongolica may have a larger atmospheric CO2 uptake, due primarily to its high photosyntheticcapacity and low ecosystem respiration.
Comparison of Population Genetic Structures between Asian and American Mungbean Accessions Using SSR Markers
Xiao-Qiang Wang,Soon-Wook Kwon,Yong-Jin Park
Journal of Agricultural Science , 2012, DOI: 10.5539/jas.v4n9p150
Abstract: The purpose of this study was to evaluate the genetic diversity and population structure of 65 mungbean accessions collected from East and Southeast Asia, the United States and Guatemala using 15 simple sequence repeat (SSR) markers. In total, 47 alleles were detected, the number of the alleles per locus range from two to six, with an average of 3.13. The mean major allele frequency (MAF), expected heterozygosity (HE), and polymorphic information content (PIC) of the 15 SSR loci were 0.76, 0.05, and 0.28, respectively. Of the 47 alleles, 17 (36.2%) were common, with a frequency of 0.05– 0.5; 16 (34.0%) were rare (frequency < 0.05) and 14 (29.8%) were abundant (frequency > 0.5). On the basis of the UPGMA dendrogram, most of the accessions were clustered into two main groups. The first group (Group I) included seven accessions and the second comprised 58 accessions, which were further divided into four subgroups. Four subpopulations were detected by model-based structure analysis. Fifty-five accessions (84.6%) showed a clear relation to each cluster based on their inferred ancestry value (>75%), while the remaining 10 accessions (15.4%) were categorized as admixtures. Mungbean accessions from US distributed to almost all clusters and 2 accessions shared genetic constituents showing it derived from mixed ancestry with Asean accessions. These results could be useful in identifying mungbean germplasms and facilitating their improvement programs.
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