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장차익,양회룡,정경복,최승평 한국물리학회 2004 새물리 Vol.49 No.4
A diraction eciency of nearly 100 % with a 100 m thick sample has been reported for acomposite of a hole-transporting polymer, poly (n-vinyl carbazole) (PVK), doped with DMNPAA, ECZ, and TNF. However, there are two drawbacks to this material. One is the short lifetime caused by crystallization. BisCzPro can be used as a plasticizer instead of ECZ to avoid the crystallization. The other issue is the slow response. The photorefractive time constant is typically on the order of 100 ms to seconds at a recording beam intensity of 1 W/cm2 under moderate external electric eld. In this research, by modifying the structure of DMNPAA, we developed new photorefractive polymer composites that have fast response time constants on the order of 10 ms and high diraction eciency . The idea is that if the structure of the NLO is modied to have exible side chains, the NLO becomes much more mobile in an electrical eld without reducing the of large anisotropy in the polarizability. Alkyl groups are substituted in DMNPAA to realize this idea. Rahn et al. reported that the substitution of alkyl can enhance the birerngence of chromophores. We synthesized several new NLOs and measured the response rate of the reorientation and the induced birefringence. We also discuss the inuence of the dispersivity and the glass transition temperature on the rapidity of the reorientation rate in the modied NLOs.
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몬테카를로 방법에 의한 수소분자의 기저상태 에너지의 수치 해석적인 계산
양해정,양회룡,정진,김미정,최승평,장차익 조선대학교 기초과학연구소 2000 自然科學硏究 Vol.23 No.1
Numerical methods that are known as Monte as Monte Carlo methods can be loosely described as statistical simulation methods, where statistical simulation is defined in quite general terms to be any method that utilizes sequences of random numbers to perform the simulation. Monte Carlo methods are now used routinely in many problems, the simulation of the esoteric subnuclear processes in high energy physics experiments, cellular automata, self-organized critical phenomena, the Ising spin glass, the simulation of a Bingo game, etc. The physical processes are simulated directly, and there are no needs to even write down the differential equations that describe the behaviors of the systems. The only requirement is that the physical systems be described by probability density functions. We consider with the Monte Carlo variational method and the Monte Carlo path integral method(MCPI). These methods are used to calculate the energy of the ground states of H2 molecule by the formal similarity between the Schroedinger equation and the multi-dimensional diffusion equation.
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정진,양회룡,최승평,장차익 조선대학교 기초과학연구소 1998 自然科學硏究 Vol.21 No.1
The scattering cross section in model atom is the physical quantity which is susceptible of a reasonably direct experimental measurement and which at the same time lends itself readily to calculation, and which establish contact between scattering theory and scattering experiment to assist each other. We have calculated the differential cross section and total cross sections of electrons by targets which are Cu, S, He, Ne, Ar on the ground state without the targets distortion with the Born approximation and the Eikonal approximation. the electron energies are in the range up to about 1.3 ev∼10 kev. The potential used to represent the interaction between atom and electron in our calculation is the same as that is used by Lens-Jensen in the evaluation of the cross-sections. We used the Gauss Legndre quadrature for our numerical integration in our differential equations.
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유대영,양해정,양회룡,정진,최승평,장차익 조선대학교 기초과학연구소 2001 自然科學硏究 Vol.24 No.-
It is difficult to explain the magnetic phase transition with classical physics in Curie temperature. We studied qualitatively with the well known Ising model in statistical mechanics. We simulated systems of finite size by Monte Carlo methods with Metropolis algorithm. Thus we could estimate the values of quantities such as the magnetization(m) per spin the specific heat(c) per spin the magnetic susceptibility(χ) per spin, and the mean energy per spin compare with the numerical values in infinitive size. The quantities of c, m, χ, e varied rapidly within 2.3∼2.4 temperature at J/k units. Those values show that the critical temperature can be within the range. The hysteresis loop was obtained with this model.
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차혁렬,양해정,김미정,정진,양회룡,최승평,장차익 조선대학교 기초과학연구소 1999 自然科學硏究 Vol.22 No.1
The one-electron theory of atoms, molecules, and crystals have enjoyed a wide success in many branches of physics. This theory provides a physically appealing description of the electronic structure of many-electron systems. In addition, this theory gives a convenient basis for performing the detailed calculation on specific many-electron systems. In such calculations, it is usually necessary to introduce many simplified assumptions in order to make a progress. Since the principal computational difficulty supposed by the Hartree-Fock equations is the treatment of the exchange term, it would be very desirable to simplify the treatment of these terms by using Slater's average of the exchange potential. The first order correction of energy in the lowest excited states of He atom is calculated by using the unperturbed wave function obtained with the Hartree-Fock-Slater approximation and compared with the result obtained by the simple analytical method. The numerical results agrees with an experimental results for the lowest excited states of He atom with tolerance 3.22%, 2.16%, 2.94% and 3.41%. These results show that the numerical analysis can be applied to other multielectron atoms with the personal computer.
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