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Search Results: 1 - 10 of 9228 matches for " Hee-Cheon Park "
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Effective Procedure for Development of EST-SSR Markers Using cDNA Library  [PDF]
Kyung A Kim, Hee-Cheon Park, Jae-Keun Sohn, Kyung-Min Kim
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.39159
Abstract: The present study was conducted to develop EST-SSR markers using the cDNA library from rice plant. Total RNA extracted from the leaves of brown plant hopper resistance gene originated from a rice cultivar “Cheongcheong” and sensitive rice cultivar “Nakdong” were used to synthesize a cDNA library. As a result of analyzing the cDNA library, the 17 EST-SSR primer sets were developed. This study enables to provide effective marker assisted selection (MAS) methods on the selection of white-backed planthopper resistance gene originated from a rice plant more simply, quickly and precisely. Furthermore, using this marker’s advantage of deriving from cDNA, it is possible to identify the white-backed planthopper resistance gene. In addition, this study introduces a technique for construction of a cDNA library safely without using radioactivity.
Populations change of the Bean Goose (Anser fabalis) wintering at the Upo Wetland, Korea
Hyo-Jun Kim,Hee-Cheon Park
Journal of Ecology and Field Biology , 2011,
Abstract: The wintering population of Bean Goose (Anser fabalis) at the Upo Wetland from 2005 to 2010 has been monitoredby the long term ecological research (LTER) project in South Korea. The principal objective of this study was to definethe primary factors determining the wintering Bean Goose population distribution in the wetland system, such as: usagepattern of habitat in and around the Upo Wetland, and departure timing related to temperature. We conducted acomprehensive literature review regarding Bean Goose population dominance in the wetland, and there was a cleartendency toward an increase in this species’ dominance until 2002. The LTER monitoring data also exhibited a similartrend, but not as strongly as was seen in previous research. When the Bean Goose population arrived at the Upo Wetland,they utilized the wetland as their resting site, while they moved to other places surrounding the wetlands to forage forfood sources. The flight distance of the Bean Goose for feeding ranged between ca 1 to 25 km from the Upo area. Thepopulation changes of the Bean Goose at the Upo were related to the lowest temperatures in winter (r = -0.461, P = 0.009).In particular, the lowest temperature in March was important for creating flocks of the Bean Goose before returning tothe northern region. The results of this study can provide us with basic information regarding migratory bird populationchanges in the Upo Wetland in relation to the land use patterns of human beings, as well as meteorological variations.
Optimal Detection Range of RFID Tag for RFID-based Positioning System Using the k-NN Algorithm
Soohee Han,Junghwan Kim,Choung-Hwan Park,Hee-Cheon Yoon,Joon Heo
Sensors , 2009, DOI: 10.3390/s90604543
Abstract: Positioning technology to track a moving object is an important and essential component of ubiquitous computing environments and applications. An RFID-based positioning system using the k-nearest neighbor (k-NN) algorithm can determine the position of a moving reader from observed reference data. In this study, the optimal detection range of an RFID-based positioning system was determined on the principle that tag spacing can be derived from the detection range. It was assumed that reference tags without signal strength information are regularly distributed in 1-, 2- and 3-dimensional spaces. The optimal detection range was determined, through analytical and numerical approaches, to be 125% of the tag-spacing distance in 1-dimensional space. Through numerical approaches, the range was 134% in 2-dimensional space, 143% in 3-dimensional space.
Enhancement of Au–Ag–Te contents in tellurium-bearing ore minerals via bioleaching
Nag-Choul Choi,Kang Hee Cho,Bong Ju Kim,Soonjae Lee,Cheon Young Park
- , 2018, DOI: https://doi.org/10.1007/s12613-018-1569-8
Abstract: The purpose of this study was to enhance the content of valuable metals, such as Au, Ag, and Te, in tellurium-bearing minerals via bioleaching. The ore samples composed of invisible Au and Au paragenesis minerals (such as pyrite, chalcopyrite, sphalerite and galena) in combination with tellurium-bearing minerals (hessite, sylvanite and Tellurobismuthite) were studied. Indigenous microbes from mine drainage were isolated and identified as Acidithiobacillus ferrooxidans, which were used in bioleaching after adaption to copper. The effect of the microbial adaption on the bioleaching performance was then compared with the results produced by the non-adaptive process. The microbial adaption enhanced the Au–Ag–Te contents in biological leaching of tellurium-bearing ore minerals. This suggests that bioleaching with adapted microbes can be used both as a pretreatment and in the main recovery processes of valuable metals.
IL-4 Induced Innate CD8+ T Cells Control Persistent Viral Infection
Ara Lee?,Seung Pyo Park,Chan Hee Park,Byung Hyun Kang?,Seong Hoe Park,Sang-Jun Ha?,Kyeong Cheon Jung
PLOS Pathogens , 2015, DOI: 10.1371/journal.ppat.1005193
Abstract: Memory-like CD8+ T cells expressing eomesodermin are a subset of innate T cells initially identified in a number of genetically modified mice, and also exist in wild mice and human. The acquisition of memory phenotype and function by these T cells is dependent on IL–4 produced by PLZF+ innate T cells; however, their physiologic function is still not known. Here we found that these IL-4-induced innate CD8+ T cells are critical for accelerating the control of chronic virus infection. In CIITA-transgenic mice, which have a substantial population of IL-4-induced innate CD8+ T cells, this population facilitated rapid control of viremia and induction of functional anti-viral T-cell responses during infection with chronic form of lymphocytic choriomeningitis virus. Characteristically, anti-viral innate CD8+ T cells accumulated sufficiently during early phase of infection. They produced a robust amount of IFN-γ and TNF-α with enhanced expression of a degranulation marker. Furthermore, this finding was confirmed in wild-type mice. Taken together, the results from our study show that innate CD8+ T cells works as an early defense mechanism against chronic viral infection.
An Eccentric Derivation of the Gravitational-Lens Effect  [PDF]
Yoonsoo Bach Park, Il-Tong Cheon
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.312245
Abstract:

The gravitational-lens effect is interpreted in the framework of the Newtonian mechanics. Regarding the photon of energy hv as a corpuscle with a tiny mass of mγ=hv/c2. We calculate it's path bended by the gravitational force near the surface of the sun. Effects of dark matter have also been evaluated.

A fast programmable trigger for isolated cluster counting in the BELLE experiment
H. J. Kim,S. K. Kim,S. H. Lee,T. W. Hur,C. H. Kim,F. Wang,I. C. Park,Hee Jong Kim,B. G. Cheon,E. Won
Physics , 1999,
Abstract: We have developed a fast programmable trigger processor board based on a field programmable gate array and a complex programmable logic device for use in the BELLE experiment. The trigger board accommodates 144 ECL input signals, 2 NIM input signals, 24 ECL output signals, and the VME bus specification. An asynchronous trigger logic for counting isolated clusters is used. We have obtained trigger latency of 50 ns with a full access to input and output signals via a VME interface. The trigger logic can be modified at any time depending on the experimental conditions.
Experimental Evaluation of Fixing Equipment for Improving the Efficiency of Modular Unit Systems  [PDF]
Kyoon-Tai Kim, Nam-Cheon Park
Journal of Building Construction and Planning Research (JBCPR) , 2014, DOI: 10.4236/jbcpr.2014.24022
Abstract: Modular unit systems provide an eco-friendly advanced construction method that improves productivity and reduces carbon emissions and construction waste. In these systems, the prefabrication ratio of the modules should be high in order to support these eco-friendly features. The purpose of this study was to verify the functionality and driving safety of fixing a modular unit with a high prefabrication ratio to a vehicle for transportation to the site using two novel adapter blocks specially developed for this purpose. When asked to evaluate their performance for this study, the truck drivers selected adaptor block type B as providing the highest convenience and functionality. In real-world driving experiments, maximum loads of 15 kN and 25 kN were measured on adapter block types A and B, respectively. Future improvements in the adapter blocks that take the safety ratio and the improved convenience of use into account are confidently expected to contribute to the eco-friendliness and the improved productivity of modular unit systems.
Microparticles from Kidney-Derived Mesenchymal Stem Cells Act as Carriers of Proangiogenic Signals and Contribute to Recovery from Acute Kidney Injury
Hoon Young Choi, Sung Jin Moon, Brian B. Ratliff, Sun Hee Ahn, Ara Jung, Mirae Lee, Seol Lee, Beom Jin Lim, Beom Seok Kim, Matthew D. Plotkin, Sung Kyu Ha, Hyeong Cheon Park
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0087853
Abstract: We recently demonstrated the use of in vitro expanded kidney-derived mesenchymal stem cells (KMSC) protected peritubular capillary endothelial cells in acute renal ischemia-reperfusion injury. Herein, we isolated and characterized microparticles (MPs) from KMSC. We investigated their in vitro biologic effects on human endothelial cells and in vivo renoprotective effects in acute ischemia-reperfusion renal injury. MPs were isolated from the supernatants of KMSC cultured in anoxic conditions in serum-deprived media for 24 hours. KMSC-derived MPs demonstrated the presence of several adhesion molecules normally expressed on KMSC membranes, such as CD29, CD44, CD73, α4, 5, and 6 integrins. Quantitative real time PCR confirmed the presence of 3 splicing variants of VEGF-A (120, 164, 188), bFGF and IGF-1 in isolated MPs. MPs labeled with PKH26 red fluorescence dye were incorporated by cultured human umbilical vein endothelial cells (HUVEC) via surface molecules such as CD44, CD29, and α4, 5, and 6 integrins. MP dose dependently improved in vitro HUVEC proliferation and promoted endothelial tube formation on growth factor reduced Matrigel. Moreover, apoptosis of human microvascular endothelial cell was inhibited by MPs. Administration of KMSC-derived MPs into mice with acute renal ischemia was followed by selective engraftment in ischemic kidneys and significant improvement in renal function. This was achieved by improving proliferation, of peritubular capillary endothelial cell and amelioration of peritubular microvascular rarefaction. Our results support the hypothesis that KMSC-derived MPs may act as a source of proangiogenic signals and confer renoprotective effects in ischemic kidneys.
Kinetic Study of Sulfur Dioxide Elimination by Limestone through the Lab Scale Circulating Fluidized Bed Combustor  [PDF]
Dowon Shun, Dal-Hee Bae, In-Kyu Jang, Keon-Hee Park, Seung Kyu Park
Advances in Materials Physics and Chemistry (AMPC) , 2012, DOI: 10.4236/ampc.2012.24B049
Abstract:

Characteristics of sulfur dioxide emission from coal and petroleum coke combustion were examined in a lab scale circulating fluidized bed (CFB) combustor. The rate constant of the first order rate expression for the absorption SO2 on the CaO surface was similar regardless of the origin of the limestone, the particle size and the initial SO2 concentration. However, the total SO2 absorption capacity was different depending on the origin of the limestone. The breakability of the particle which provides new surface for the reaction seems to play a major role in the absorption characteristics.


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