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Search Results: 1 - 10 of 25274 matches for " Junghun Lee "
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The Artin-Mazur zeta functions of certain non-Archimedean dynamical systems
Junghun Lee
Mathematics , 2015,
Abstract: In this paper, we will prove the rationality of the Artin-Mazur zeta functions of some non-Archimedean dynamical systems.
$J$-Stability of immediately expanding rational maps in non-Archimedean dynamical systems
Junghun Lee
Mathematics , 2015,
Abstract: The aim of this paper is to show $J$-stability of immediately expanding rational maps over an algebraically closed, complete, and non-Archimedean field, which is an analogue of R. Man\~e, P. Sad, and D. Sullivan's theorem of $J$-stability in complex dynamical systems.
An alternative proof of the non-Archimedean Montel theorem for polynomial dynamics
Junghun Lee
Mathematics , 2015,
Abstract: We will see an alternative proof of the non-Archimedean Montel theorem, which is also called Hsia's criterion, for polynomial dynamics.
$J$-Stability of immediately expanding polynomial maps in $p$-adic dynamics
Junghun Lee
Mathematics , 2014,
Abstract: Given a family $\{ f_{\lambda} \}_{\lambda \in \Lambda}$ of polynomial maps of degree $d$ where $\Lambda$ is the set of parameters, a polynomial map $f_{\lambda_0}$ is called {\it $J$-stable in $\Lambda$} if there exists a neighborhood of $\lambda_0$ in $\Lambda$ such that for any element $\lambda$ in the neighborhood, there exists a conjugacy between the dynamics on the Julia sets of $f_\lambda$ and $f_{\lambda_0}$. The aim of this paper is to show that a polynomial map $f_{\lambda_0}$ over the field $\mathbb{C}_p$ of $p$-adic complex numbers is $J$-stable in the family of polynomial maps over $\mathbb{C}_p$ if $f_{\lambda_0}$ is {\it immediately expanding}.
An ergodic value distribution of some certain meromorphic functions
Junghun Lee,Ade Irma Suriajaya
Mathematics , 2015,
Abstract: In this paper, we introduce an application of Birkhoff's ergodic theorem to some certain meromorphic functions. We also apply our main result to some class of zeta functions including Dedekind $\zeta$-functions and Dirichlet $L$-functions.
Effect of Opuntia humifusa Supplementation and Acute Exercise on Insulin Sensitivity and Associations with PPAR-γ and PGC-1α Protein Expression in Skeletal Muscle of Rats
Junyong Kang,Junghun Lee,Daekeun Kwon,Youngju Song
International Journal of Molecular Sciences , 2013, DOI: 10.3390/ijms14047140
Abstract: This study examined whether O puntia humifusa ( O. humifusa), which is a member of the Cactaceae family, supplementation and acute swimming exercise affect insulin sensitivity and associations with PPAR-γ and PGC-1α protein expression in rats. Thirty-two rats were randomly divided into four groups (HS: high fat diet sedentary group, n = 8; HE: high fat diet acute exercise group, n = 8; OS: 5% O. humifusa supplemented high fat diet sedentary group, n = 8; OE: 5% O. humifusa supplemented high fat diet acute exercise group, n = 8). Rats in the HE and OE swam for 120 min. before being sacrificed. Our results indicated that serum glucose level, fasting insulin level and homeostasis model assessment of insulin resistance (HOMA-IR) in OS were significantly lower compared to those of the HS ( p < 0.01, p < 0.05, p < 0.05). In addition, PPAR-γ protein expression in the OS and OE was significantly higher than that of the HS and HE, respectively ( p < 0.05, p < 0.01). PGC-1α and GLUT-4 protein expressions in the OS were significantly higher compared to those of the HS ( p < 0.05, p < 0.05). From these results, O. humifusa supplementation might play an important role for improving insulin sensitivity through elevation of PPAR-γ, PGC-1α, and GLUT-4 protein expression in rat skeletal muscle.
Comparative Analysis of Pathogenicity Assays and PCR for Listeria monocytogenes Isolated from Animal, Raw Food and Environmental Sources in Korea  [PDF]
Sanghun Park, Jihun Jung, Younghee Oh, Jibho Lee, Seunghee Ryu, Hyowon Jung, Sunhee Park, Miok Song, Gunyong Park, Sungmin Choi, Sangmi Lee, Junghun Kim, YoungZoo Chae, Byungyeol Jung, Myunghun Lee, Hyunsoo Kim
Advances in Microbiology (AiM) , 2013, DOI: 10.4236/aim.2013.32029

Results of PCR with oligonucleotide primers were designed from the assembled panel of four potential virulence genes (two of internalin gene and two of transcriptional regulator gene). Most of the isolates including reference strains were reactive by PCR, whereas the other strains (No.80, 81, and 83) isolated from pork, were non-reactive by PCR. In particular, all pork isolates were PCR-negative for two primers (lmo2672 and 2821) sets tested. However, No.82 was positive for lmo1134 primer, and No.84 was positive for lmo2470 of pork isolates. It was observed that all Listeria monocytogenes (L. monocytogenes) penetrate Vero cells, although the invasion efficiency of each strain varied (between 0.5 and 18.9%). When compared in cell assay with PFGE, the results were shown that the mean invasion efficiency for lineage II isolate (2.6%) was significantly lower (ANOVA-test, p < 0.05) than that for lineage I (12.9%) and III isolates (10.3%).

Molecular Characterization of Listeria monocytogenes Based on the PFGE and RAPD in Korea  [PDF]
Sanghun Park, Jihun Jung, Sungsun Choi, Younghee Oh, Jibho Lee, Heesun Chae, Seunghee Ryu, Hyowon Jung, Gunyong Park, Sungmin Choi, Bogsoon Kim, Junghun Kim, Young Zoo Chae, Byungyeol Jung, Myunghun Lee, Hyunsoo Kim
Advances in Microbiology (AiM) , 2012, DOI: 10.4236/aim.2012.24079

This study was performed to characterize 35 L. monocytogenes isolates from animals, foods, environmental samples collected between 1997 and 2007 with no apparent epidemiological relations, and five reference isolates using serotypic, genotypic and molecular typing methods to understand the pattern of strain distribution in Korea. For this study, we used serotyping and detected 6 different virulence-associated genes (inlA, inlB, plcA, plcB, hlyA, and actA) and 16s rRNA using multiplex-PCR. We also compared RAPD and PFGE to determine genetic characterization of L. monocytogenes strains to define the genetic diversity. Serotype patterns of the 30 L. monocytogenes strains was as follows; 9 isolates (30.0%) belonged to serotype, 7 isolates (23.3%) belonged to serotype 4b, 4 isolates (13.3%) belonged to serotype 1/2b, 3 isolates (10.0%) belonged to serotype 1/2c, 2 (6.7%) isolates belonged to4c, 2 (6.7%) isolates belonged to NT (Non Type), one isolate (3.2%) belonged to3aand 3b, and4a, respectively. Although, a limited number of isolates were analyzed in this study, molecular typing with RAPD and PFGE indicated that PFGE is more discriminatory for the subtyping L. monocytogenes than RAPD. Some L. monocytogenes isolates by RAPD and PFGE types are associated with specific sources. And, combining data obtained by these methods will increases the likelihood of strain discrimination.

Distributed and Fault-Tolerant Routing for Borel Cayley Graphs
Junghun Ryu,Eric Noel,K. Wendy Tang
International Journal of Distributed Sensor Networks , 2012, DOI: 10.1155/2012/124245
Abstract: We explore the use of a pseudorandom graph family, Borel Cayley graph family, as the network topology with thousands of nodes operating in a packet switching environment. BCGs are known to be an efficient topology in interconnection networks because of their small diameters, short average path lengths, and low-degree connections. However, the application of BCGs is hindered by a lack of size flexibility and fault-tolerant routing. We propose a fault-tolerant routing algorithm for BCGs. Our algorithm exploits the vertex-transitivity property of Borel Cayley graphs and relies on extra information to reflect topology change. Our results show that the proposed method supports good reachability and a small End-to-End delay under various link failures scenarios. 1. Introduction Various graph-based interconnection networks have been applied to wavelength division multiplexed optical networks [1, 2], distributed parallel computation [3], distributed control [4], satellite constellations [5], chip design [6–9], and wireless sensor networks [10, 11]. In peer-to-peer overlay network schemes, various structure graphs are investigated compared to unstructured P2P overlay network [12]. For the example of structured P2P, ring lattice is used in Chord [13] and de Bruijn graph is used in Koorde and Distance Halving [14, 15]. Also there are theoretic analyses to apply de Bruin and Cayley graphs to P2P [16, 17]. Deterministic characteristics for connections between nodes in structured graphs allow theoretical analysis and guarantee global properties such as a diameter and average path length [18]. Also graph-based networks can have symmetry, hierarchy, connectivity, and hamiltonicity, which are desired properties comparing random graph-based networks [17, 19]. Borel Cayley graphs (BCGs) have been shown to be efficient candidates for interconnection networks [20]. BCGs are known to have small diameters, average path lengths, and low-degree constant connections. The degree-diameter problem has been investigated in the contexts of interconnection networks [21, 22], wavelength division multiplexed optical networks [23], and VLSI layout design [24]. Also, BCGs are symmetric graphs, a property that enables distributed routing [25]. With consensus protocol [26], distributed node to node message exchange rule to drive nodes to an agreement for a quantity of interest, BCG showed better performance than mesh, torus, and small world networks [27]. Even though BCGs have such favorable properties, there are practical limitations in applying BCGs to networks. One of them is the lack of
Evolution of Online Social Networks: A Conceptual Framework
Junghun Kim,Choonseong Leem,Byungun Kim,Youngjoon Cheon
Asian Social Science , 2013, DOI: 10.5539/ass.v9n4p208
Abstract: Booming industry recently Online Social Networks company's market success factors and coping strategies for change has focused attention from all walks of life. In particular, Facebook, Twitter and other social networking platform, a leading user experience companies' technological excellence and the main part of the discussion is related to excellence. However, most previous studies of the usefulness or user acceptance of sites, pattern, design excellence, such as the concept of local debate unfold around them. Therefore, the market dynamics of online social network field changes and the future evolution of corporate strategy and does not reflect the same aspects that synthetically has the limit. In this study proposes online social network’s evolutionary path and changed factor from three perspectives of technology, suppliers, and users, and provides implications through examples of existing business cases.
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