• Journal of The Korean Astronomical Society
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• v.34 no.4
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• pp.301-303
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• 2001

We suggest a possible scenario of an astrophysical black hole with non-vanishing electric charge and magnetic flux. The equilibrium charge on a rotating black hole in a force-free magnetosphere is calculated to be Q $\~$ BJ with a horizon flux of ${\~}BM^2$, which is not large enough to disturb the background Kerr geometry. Being similar to the electric charge of a magnetar, in sign and order of magnitude, both electric charge and magnetic flux are supposed to be continuous onto a black hole.

• Proceedings of the Optical Society of Korea Conference
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• 2001.02a
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• pp.124-125
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• 2001

The electro-magnetic vector equation(F=$qv{\times}B$ ; F：force, B：magnetic field, q：plus charge, v ：velocity of the charge) explains well about the rotations of electron and positron under the magnetic field[Ref.1], as in Fig.1(a). Because the electro-magnetic wave is also a motion of the alternating charge and magnetic field as in Fig.2, the force vector has all the time inwarding direction and then the wave has a rotating motion. The positron in the proton has constant charge and alternating one at the same time[Ref.2] and then the alternating charge makes the absorbing force with the alternating charge of the rotating wave ($\pi$-ray) around the nucleus[Ref.2]. (omitted)

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.49 no.4
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• pp.226-232
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• 2000

In magnetic systems, distribution of electromagnetic force density causes mechanical deformation, which results in noise and vibration. In this paper, Korteweg-Helmholtzs energy method and equivalent magnetic charge method are employed for comparison of their resulting distributions of force density. The force density from the Korteweg-Helmholtzs method is expresses with two Maxwell stresses on the inside and the outside fo magnetic material respectively. The other is calculated using the magnetic Coulombs law. In the numerical model of an electromagnet, their numerical results are compared. The distributions by the two methods are almost the same. And their total forces are also shown to be the same to the one calculated from the conventional Maxwell stress tensor. But the magnetic charge method is easier and more efficient in numerical calculation.

• Proceedings of the Korean Magnestics Society Conference
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• 2002.12a
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• pp.148-149
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• 2002

In recent years, semiconductor spintronics has been rapidly developing due to potential device applications, in which the spin of charge carriers (electrons or holes) provides novel functionalities to carry signals and process information. Diluted magnetic semiconductors (DMSs) are well known to exhibit intriguing properties such as carrier-mediated ferromagnetism and spin-dependent transport resulting from the coupling between the charge transport states and the magnetic moments (spin) [1-3]. (omitted)

• Journal of the Korean Magnetics Society
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• v.20 no.3
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• pp.100-105
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• 2010

For predicting magnetic signals due to the remanent magnetization distributed on a ferromagnetic ship hull, this paper presents an efficient methodology for solving inverse problems, where the material sensitivity analysis based on the continuum mechanics is combined with the equivalent magnetic models. To achieve this, the 3D magnetic charge model and the magnetic dipole moment model are introduced and material sensitivity formulae applicable to each equivalent model are derived. The formulae offer the first-order gradient information of an objective function with respect to the variation of the magnetic charge or magnetic dipole and so an optimal solution can be easily obtained regardless of the number of design variables. To validate the proposed method, the numerical results are comparison with the real measurements of a mock-up model.

• Proceedings of the Korean Magnetic Resonance Society Conference
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• 2000.08a
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• pp.39-39
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• 2000

• Journal of Information Display
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• v.3 no.3
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• pp.30-34
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• 2002

CRTs can be improved by means of magnetic quadrupoles. Areas of improvement are convergence, spot shape, image-flatness and space charge compensation.

• Proceedings of the Korean Magnetic Resonance Society Conference
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• 2002.08a
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• pp.91-91
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• 2002

• Journal of the Korean Magnetic Resonance Society
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• v.12 no.2
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• pp.111-118
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• 2008

The mechanism of charge flow has been probed by measuring the $^{1}H$ chemical shift on a proton-irradiated ${KH_2}{PO_4}$ (KDP) single crystal. The proton irradiation caused the increase in $^{1}H$ chemical shift. It can be interpreted as the electronic charge transfer from the proton to oxygen atom, accompanied with the proton displacement along the hydrogen bond. For the high resolution $^{1}H$ chemical shift measurement, CRAMPS (Combined Rotation And Multiple Pulses) technique is utilized.

• Korean Journal of Crystallography
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• v.14 no.1
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• pp.25-31
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• 2003

Accelerated electric charge is the source of electromagnetic waves. If electric charge is accelerated, the electric field set up by the electric charge is also accelerated. A changing electric field produces a changing magnetic field and the changing magnetic field produces an electric field and the process is self-perpetuating. The lines of B as well as E thus occurred form closed loops that move away from the source with speed c. These traveling electric and magnetic fields. which are strongly interdependent, constitute electromagnetic radiation. All the properties of electromagnetic waves can be deduced mathematically from Maxwell's equations.