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Search Results: 1 - 10 of 30298 matches for " Young Min Cho "
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The relationship between cardiovascular disease risk factors and gender  [PDF]
Chung-Min Cho, Young-Mi Lee
Health (Health) , 2012, DOI: 10.4236/health.2012.46051
Abstract: The purpose of this study was to investigate the relationship between three socioeconomic sta- tuses and five behavior-related cardiovascular risk factors by gender, based on data from the Third Korea National Health and Nutrition Examination III. Data from 4556 people were analyzed. The propensity toward obesity, hypercholesterolemia, and physical inactivity was significantly higher in women than in men. Hypertension and smoking were significantly more prevalent in men than in women. The differences in the prevalence of cardiovascular disease risk factors by gender is important and should be considered when developing programs to reduce the incidence of cardiovascular diseases.
Controllable conditional quantum oscillations and synchronization in superconducting flux qubits
Ai Min Chen,Sam Young Cho
Physics , 2010, DOI: 10.1143/JJAP.50.113101
Abstract: Conditional quantum oscillations are investigated for quantum gate operations in superconducting flux qubits. We present an effective Hamiltonian which describes a conditional quantum oscillation in two-qubit systems. Rabi-type quantum oscillations are discussed in implementing conditional quantum oscillations to quantum gate operations. Two conditional quantum oscillations depending on the states of control qubit can be synchronized to perform controlled-gate operations by varying system parameters. It is shown that the conditional quantum oscillations with their frequency synchronization make it possible to operate the controlled-NOT and -U gates with a very accurate gate performance rate in interacting qubit systems. Further, this scheme can be applicable to realize a controlled multi-qubit operation in various solid-state qubit systems.
Characterization of Single-Walled Carbon Nanotubes with Nodal Structural Defects
Young I. Jhon,Woonjo Cho,Seok Lee,Young Min Jhon
Physics , 2014,
Abstract: Recently experiments showed that nodal structural defects are readily formed in the synthesis of single-walled carbon nanotubes (SWNTs) and consequently, SWNTs are likely to deviate from well-defined seamless tubular structures. Here, using graphene-helix growth model, we describe structural details of feasible nodal defects in SWNTs and investigate how mechanical and electronic properties of SWNTs would change in the presence of them using computational methods. Surprisingly atomistic simulations of SWNTs with nodal defects show excellent agreement with previous structural, tensile, and ball-milling experiments whose results cannot be explained using conventional models. The tensile failure of SWNTs with nodal defects requires about four- or six-fold lower strength than pristine ones and these SWNTs are comparatively prone to damage under a lateral compressive biting. We reveal that electronic band-gap of SWNT(12,8) would be remarkably reduced in the presence of nodal defects. This study strongly indicates universality of nodal defects in SWNTs requesting new theoretical framework in SWNT modelling for proper characteristics prediction.
Existence of Nonoscillatory Solutions for a Third-Order Nonlinear Neutral Delay Differential Equation
Zeqing Liu,Lin Chen,Shin Min Kang,Sun Young Cho
Abstract and Applied Analysis , 2011, DOI: 10.1155/2011/693890
Abstract: The aim of this paper is to study the solvability of a third-order nonlinear neutral delay differential equation of the form {()[()(()
Some results on variational inequalities and generalized equilibrium problems with applications
Qin, Xiaolong;Cho, Sun Young;Kang, Shin Min;
Computational & Applied Mathematics , 2010, DOI: 10.1590/S1807-03022010000300005
Abstract: an iterative algorithm is considered for variational inequalities, generalized equilibrium problems and fixed point problems. strong convergence of the proposed iterative algorithm is obtained in the framework hilbert spaces. mathematical subject classification: 47h05, 47h09, 47j25, 47n10.
Convergence of Iterative Sequences for Generalized Equilibrium Problems Involving Inverse-Strongly Monotone Mappings
Shin Min Kang,Sun Young Cho,Zeqing Liu
Journal of Inequalities and Applications , 2010, DOI: 10.1155/2010/827082
Abstract: The purpose of this paper is to consider the weak convergence of an iterative sequence for finding a common element in the set of solutions of generalized equilibrium problems, in the set of solutions of classical variational inequalities, and in the set of fixed points of nonexpansive mappings.
A Weak Convergence Theorem for Total Asymptotically Pseudocontractive Mappings in Hilbert Spaces
Xiaolong Qin,Sun Young Cho,Shin Min Kang
Fixed Point Theory and Applications , 2011, DOI: 10.1155/2011/859795
Entanglement and Berry Phase in Two Interacting Qubits
Ai Min Chen,Sam Young Cho,Taeseung Choi
Physics , 2008,
Abstract: Entanglement and Berry phase are investigated in two interacting qubit systems. The XXZ spin interaction model with a slowly rotating magnetic field is employed for the interaction between the two qubits. We show how the anisotropy of interaction reveals unique relations between the Berry phases and the entanglements for the eigenstates of the system.
Implementation of three-qubit Toffoli gate in a single step
Ai Min Chen,Sam Young Cho,Mun Dae Kim
Physics , 2012, DOI: 10.1103/PhysRevA.85.032326
Abstract: Single-step implementations of multi-qubit gates are generally believed to provide a simpler design, a faster operation, and a lower decoherence. For coupled three qubits interacting with a photon field, a realizable scheme for a single-step Toffoli gate is investigated. We find that the three qubit system can be described by four effective modified Jaynes-Cummings models in the states of two control qubits. Within the rotating wave approximation, the modified Jaynes-Cummings models are shown to be reduced to the conventional Jaynes-Cummings models with renormalized couplings between qubits and photon fields. A single-step Toffoli gate is shown to be realizable with tuning the four characteristic oscillation periods that satisfy a commensurate condition. Possible values of system parameters are estimated for single-step Toffli gate. From numerical calculation, further, our single-step Toffoli gate operation errors are discussed due to imperfections in system parameters, which shows that a Toffoli gate with high fidelity can be obtained by adjusting pairs of the photon-qubit and the qubit-qubit coupling strengthes. In addition, a decoherence effect on the Toffoli gate operation is discussed due to a thermal reservoir.
Is the Fano Antiresonance a Necessary Requirement for Circulating Currents in Mesoscopic Interferometers?
Yao Heng Su,Sam Young Cho,Ai Min Chen
Physics , 2010,
Abstract: Coherent quantum tunneling effects on quantum interference are investigated in electron transport through a mesoscopic interferometer. An evanescent wave tunneling through a potential barrier in one arm can interfere with a propagating wave passing through the other arm of interferometer. It is shown that, even for the same arm lengths, such a quantum interference can induce a circulating current, where Fano antiresonances do not occur in electron transmission. It is found that there exists a critical value of asymmetric arm lengths that gives rise to a Fano antiresonance in electron transmission for the quantum interference between evanescent and propagating waves. We discuss the effects of Fano antiresonances originating from the asymmetric arm lengths on circulating currents.
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