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Search Results: 1 - 10 of 35611 matches for " Park Sun "
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Expression breadth and expression abundance behave differently in correlations with evolutionary rates
Seung Park, Sun Choi
BMC Evolutionary Biology , 2010, DOI: 10.1186/1471-2148-10-241
Abstract: In the present paper, we analyzed the relationship between the two expression variables and rates using two different genome-scale expression datasets, microarrays and ESTs. A significant positive correlation between the expression abundance (EA) and expression breadth (EB) was revealed by Kendall's rank correlation tests. A novel random shuffling approach was applied for EA and EB to compare the correlation coefficients obtained from real data sets to those estimated based on random chance. A novel method called a Fixed Group Analysis (FGA) was designed and applied to investigate the correlations between expression variables and rates when one of the two expression variables was evenly fixed.In conclusion, all of these analyses and tests consistently showed that the breadth rather than the abundance of gene expression is tightly linked with the evolutionary rate in multicellular organisms.Proteins in a species evolve at different rates [1]. The systems evolutionary genomics field studies the factors that determine the evolutionary rates of proteins. Over the last thirty years, since the neutral evolutionary theory was first suggested, a lack of sequence data prevented thorough investigation of protein evolution. One accepted consensus is that protein evolutionary rates are controlled by the density of amino acid residues in a protein under the influence of different functional constraints [2]. In other words, the functional importance of amino acid residues and their densities in a protein determine its evolutionary rate. This 'function-centered' hypothesis predicts several evolutionary outcomes. For example, proteins with high dispensability and a high propensity of gene loss (PGL) are expected to evolve more rapidly [3], whereas essential proteins and those at hub positions in a protein-protein interaction (PPI) network are predicted to evolve more slowly [4-6]. These hypotheses have been proven or disproven by various research groups through analyses of differen
Automatic E-mail Classification Using Dynamic Category Hierarchy and Semantic Features
Park Sun,An Dong
IETE Technical Review , 2010,
Abstract: The explosive increase in the use of e-mails has produced a large amount of information, and caused a problem in that many spam or regular e-mails with the same or similar contents are duplicated over and over day-to-day. We often group e-mails into categories in order to maintain e-mails efficiently. However, reading the e-mail messages and classifying them is still a tedious task. Moreover, the number of e-mails and its manual classification is increasing every day. So, e-mail users are demanding methods that can classify e-mails more and more efficiently. In this paper, we propose an e-mail multicategory classification and e-mail message reorganization method using semantic features and a dynamic category hierarchy reconstruction method. The proposed method in this paper classifies multicategory e-mails automatically and supports keyword and directory search methods in the classified results so that a large volume of e-mails can be managed efficiently. In addition, we used an interactive dynamic category hierarchy reconstruction method in which the user reorganizes all e-mail messages into categories and thus enhances the efficiency of directory searches.
Approximate *-derivations and approximate quadratic *-derivations on C*-algebras
Jang Sun,Park Choonkil
Journal of Inequalities and Applications , 2011,
Abstract: In this paper, we prove the stability of *-derivations and of quadratic *-derivations on Banach *-algebras. We moreover prove the superstability of *-derivations and of quadratic *-derivations on C*-algebras. 2000 Mathematics Subject Classification: 39B52; 47B47; 46L05; 39B72.
EFT for electroweak processes of light nuclei
Tae-Sun Park
Physics , 2003, DOI: 10.1016/j.nuclphysa.2004.03.062
Abstract: Recently we succeeded to make a reliable EFT prediction in a totally parameter-free manner for the $S$ factors for the solar $pp$ and $hep$ processes, $p+p\to d + e^+ +\nu_e$ and $\He3+p \to \He4 + e^+ + \nu_e$. The strategy used in there is to embed a highly sophisticated standard nuclear physics approach (SNPA) exploiting realistic potentials into an EFT framework, that we refer to as EFT*. Up to next-next-to-leading order in chiral expansion, it turnes out that there is effectively only one counter-term relevant to this process, the coefficient of which -- ($\hat d^R$) -- has been renormalized to reproduce the experimental value of the tritium-beta decay. Our study has also led to {\em very} accurate EFT calculations on two-body weak processes that also receive contributions from the $\hat d^R$ term, $\mu-d$ capture rate, and $\nu-d$ scattering cross section.
Effective Field Theory for Low-Energy np Systems
Tae-Sun Park
Physics , 1998,
Abstract: The properties of low-energy neutron-proton systems are studied in an effective field theory where only nucleons figure as relevant degrees of freedom. With a finite momentum cut-off regularization scheme, we show that the large scattering lengths of the np systems do not spoil the convergence of the effective field theory, which turns out to be extremely successful in reproducing, with little cut-off dependence, the deuteron properties, the np 1S0 scattering amplitude and most significantly, the M1 transition amplitude entering into the radiative np capture process.
Synthesis and Electrochemical Characterization of Li2MnSiO4 with Different Crystal Structure as Cathode Material in Lithium Rechargeable Batteries  [PDF]
Joongpyo Shim, Sora Won, Gyungse Park, Ho-Jung Sun
Advances in Materials Physics and Chemistry (AMPC) , 2012, DOI: 10.4236/ampc.2012.24B048
Abstract:

Li2MnSiO4 with different crystal structure was synthesized by solid state reaction method. Their crystal structure and electrochemical properties have been characterized by X-ray diffraction and charge-discharge test. The material prepared at 900oC in N2 atmosphere had γ-phase and its crystal structure changed to β-phase by post-heating at 400oC in air after 900oC sintering. In electrochemical measurement, two materials (γ- and β-phase) showed ~3 and ~45mAh/g, respectively. The different capacities of these two materials might be due to the change of crystal structure.



On asymptotic behavior of global solutions for hyperbolic hemivariational inequalities
Jong Yeoul Park,Sun Hye Park
Electronic Journal of Differential Equations , 2006,
Abstract: In this paper we study the existence of global weak solutions for a hyperbolic differential inclusion with a discontinuous and nonlinear multi-valued term. Also we investigate the asymptotic behavior of solutions.
Existence and Asymptotic Stability of Solutions for Hyperbolic Differential Inclusions with a Source Term
Park Jong Yeoul,Park Sun Hye
Journal of Inequalities and Applications , 2007,
Abstract: We study the existence of global weak solutions for a hyperbolic differential inclusion with a source term, and then investigate the asymptotic stability of the solutions by using Nakao lemma.
Existence and Asymptotic Stability of Solutions for Hyperbolic Differential Inclusions with a Source Term
Jong Yeoul Park,Sun Hye Park
Journal of Inequalities and Applications , 2007, DOI: 10.1155/2007/56350
Abstract: We study the existence of global weak solutions for a hyperbolic differential inclusion with a source term, and then investigate the asymptotic stability of the solutions by using Nakao lemma.
Solutions for a hyperbolic system with boundary differential inclusion and nonlinear second-order boundary damping
Jong Yeoul Park,Sun Hye Park
Electronic Journal of Differential Equations , 2003,
Abstract: In this paper we study the existence of generalized solutions for a hyperbolic system with a discontinuous multi-valued term and nonlinear second-order damping terms on the boundary.
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