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87 results on '"Kang, Bong-Soo"'

1. A Gravitational Aharonov-Bohm Effect, and its Connection to Parametric Oscillators and Gravitational Radiation

Author

Chiao, Raymond Y., Haun, Robert W., Inan, Nader A., Kang, Bong-Soo, Martinez, Luis A., Minter, Stephen J., Muñoz, Gerardo A., and Singleton, Douglas A.

Subjects
Quantum Physics, General Relativity and Quantum Cosmology
Abstract

A thought experiment is proposed to demonstrate the existence of a gravitational, vector Aharonov-Bohm effect. A connection is made between the gravitational, vector Aharonov-Bohm effect and the principle of local gauge invariance for nonrelativistic quantum matter interacting with weak gravitational fields. The compensating vector fields that are necessitated by this local gauge principle are shown to be incorporated by the DeWitt minimal coupling rule. The nonrelativistic Hamiltonian for weak, time-independent fields interacting with quantum matter is then extended to time-dependent fields, and applied to problem of the interaction of radiation with macroscopically coherent quantum systems, including the problem of gravitational radiation interacting with superconductors. But first we examine the interaction of EM radiation with superconductors in a parametric oscillator consisting of a superconducting wire placed at the center of a high Q superconducting cavity driven by pump microwaves. We find that the threshold for parametric oscillation for EM microwave generation is much lower for the separated configuration than the unseparated one, which then leads to an observable dynamical Casimir effect. We speculate that a separated parametric oscillator for generating coherent GR microwaves could also be built., Comment: 25 pages, 5 figures, YA80 conference (Chapman University, 2012)

Published
2013
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3. Design of a Composite Sensor Node in Agricultural Ubiquitous Sensor Networks

Author

Lee, Junghoon, Park, Gyung-Leen, Kim, Hye-Jin, Kwak, Ho-Young, Lee, Seongjun, Lee, Jong-Heon, Kang, Bong-Soo, Kim, Yun-Hyuk, Kim, Tai-hoon, editor, Adeli, Hojjat, editor, Fang, Wai-chi, editor, Vasilakos, Thanos, editor, Stoica, Adrian, editor, Patrikakis, Charalampos Z., editor, Zhao, Gansen, editor, Villalba, Javier García, editor, and Xiao, Yang, editor

Published
2012
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4. Longitudinal Field of Radially Polarized Microwaves in Focal Region of Parabolic Reflector and some Applications (vacuum acceleration and quasi Bessel beam)

Author

Kang, Bong Soo

Subjects
Physics, focal region, longitudinal field, parabolic mirror, quasi Bessel beam, radially polarized, ultratight focusing vacuum accelerator
Abstract

The longitudinal component of radially polarized electric field in the focal region has attracted particular attention in the laser optics due to its several special characteristics, namely, the directional characteristic on propagation axis, strong intensity and small focal size when tightly focused with high-numerical-aperture optical system, which find applicationssuch as particle acceleration, molecule microscopy, material processing, and particle trapping. It has been proposed and experimentally demonstrated that paraboloidal reflector creates smaller focal size compared with lens.Comparatively little attention has been paid to its microwave version since, in microwave regime, the directional property in focal region has not been the main interest. Only very recently, after the introduction of planar slot antenna which can generate microwaves with focusing for near field scanning, the longitudinal component of radially polarized microwavewith the slot antenna has been experimentally investigated. However, the focusing of radially polarized microwave with paraboloidal reflector is much more versatile in applications as in the optical regime.The experimental observation of this longitudinal component is newly performed in this work with a configuration of two-paraboloidal-mirror system. This longitudinal field of microwave and the two-mirror system can also be exploited in some applications such as microwave scanning, microwave acceleration in free space, and creating Bessel-like beamwhich can be used in high resolution tomography, micro-manipulation in optical regime and long range communication in microwave regime. Two applications, microwave particle acceleration and quasi Bessel beam, are investigated in this work. A new method of ultratight focusing acceleration is proposed and a more precise analysis of quasi Bessel beam with variable cone angles is demonstrated.

Published
2016

13. Robust tracking control of a direct drive robot

Author

Kang, Bong Soo, Kim, Soo Hyun, Kwak, Yoon Keun, and Smith, Craig C.

Subjects
Tracking systems -- Models, Command and control systems -- Models, Control theory -- Models, Robots -- Control systems, Engineering and manufacturing industries, Science and technology
Abstract

This paper presents a robust controller for tracking control of a direct-drive robot. The proposed controller consists of two portions: a computed torque method which precompensates for dynamics of the modeled plant and an [H.sub.[infinity]] controller which postcompensates for residual errors which are not completely removed by the computed torque method. Experimental methods for identifying appropriate model structure and parameters are presented, and three specific controller types are compared. Using the robot designed in our laboratory, the combined controller reduced tracking errors by one half compared to computed torque control alone, and by one sixth compared to conventional independent joint control.

Published
1999

14. Yonggwang 5 & 6 NSSS design improvements. (Power Plant Design)

Author

Sohn, Yong Soo, Jin, Seung Ryung, Sohn, Gap Heon, Jun, Je Keun, Lee, Sim Kyo, Kang, Bong Soo, and Terry, Robert A

Subjects
Nuclear power plants -- Design and construction, Nuclear industry -- Design and construction, Business, Business, international, Petroleum, energy and mining industries
Abstract

The main system designs of Yonggwang 5 and 6 are basically the same as those of Ulchin 3 and 4, which was the first Korean Standard Nuclear Power Plant. However, [...]

Published
2003

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