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혁신저항모델을 활용한 중소기업 기술혁신에 따른 SCM시스템 도입 영향 연구
오용민(Yongmin Oh),부제만(Jeman Boo) 한국산업경영시스템학회 2021 한국산업경영시스템학회지 Vol.44 No.3
As the advent of the Fourth Industrial Revolution and Information Age, companies are in the state of infinite competition due to the rapidly changing technological environment and fierce competition. In this situation companies are making efforts to gain the competitive advantage by introducing information systems. Supply Chain Management (SCM) is considered a method to gain a competitive edge in rapid change. In fact, companies that already have introduced the SCM system are achieving company renovation with positive effects such as increase of sales stock reduction on-time delivery cost reduction and improved efficiency. This study was started to investigate the resistance that occurs in introducing the SCM system for small and medium-sized manufacturing industries that have not yet introduced the SCM system despite the importance of the SCM system, and to check the effect on the intention of the introduction. As the result of this study, the first is that the company has the higher technological innovation, the more positive the effect on Relative advantage Compatibility Perceived risk, Complexity. Second, The compatibility of the SCM system was rejected in innovation resistance, but it is adopted with the highest impact in the introduction intention. In addition, the mediating effect of innovation resistance was also rejected, confirming that if the SCM system is compatible for the company, it doesn’t affect the resistance and is the biggest factor to consider in the introduction of the SCM system. Third, the perceived risk of the SCM system doesn’t directly affect the intention to introduce, but has an indirect effect when mediation innovation resistance.
Solution-generating methods of Einstein’s equations by Hamiltonian reduction
Oh, Seung Hun,Kimm, Kyoungtae,Cho, Yongmin,Yoon, Jong Hyuk World Scientific Publishing Company 2018 Modern physics letters A Vol.33 No.18
<P>The purpose of this paper is to demonstrate a new method of generating exact solutions to Einstein’s equations obtained by the Hamiltonian reduction. The key element to the successful Hamiltonian reduction is finding the privileged spacetime coordinates in which physical degrees of freedom manifestly reside in the conformal two-metric, and all the other metric components are determined by the conformal two-metric. In the privileged coordinates, Einstein’s constraint equations become <I>trivial</I>; the Hamiltonian and momentum constraints are simply the defining equations of a nonvanishing gravitational Hamiltonian and momentum densities in terms of conformal two-metric and its conjugate momentum, respectively. Thus, given any conformal two-metric, which is a constraint-free data, one can construct the whole four-dimensional spacetime by integrating the first-order <I>superpotential</I> equations. As the first examples of using Hamiltonian reduction in solving Einstein’s equations, we found two exact solutions to Einstein’s equations in the privileged coordinates. Suitable coordinate transformations from the privileged to the standard coordinates show that they are just the Einstein-Rosen wave and the Schwarzschild solution. The local gravitational Hamiltonian and momentum densities of these spacetimes are also presented in the privileged coordinates.</P>
Novel hollow optical fibers and their applications in photonic devices for optical communications
Oh, Kyunghwan,Choi, S.,Jung, Yongmin,Lee, J.W. IEEE 2005 Journal of lightwave technology Vol.23 No.2
Novel photonic devices based on a new type of waveguide, hollow optical fibers (HOF), are described. Utilizing unique three layered structure of HOF, the central air hole, germanosilicate ring core, and silica cladding along with its adiabatic mode transformation capability we demonstrated versatile applications in short-haul, long-haul optical communications, and tunable wavelength selective devices. Detailed design parameters, fabrication arts of the fibers, and operation principles of the devices are discussed.
Jung, Yongmin,Lee, Sejin,Lee, Byeong Ha,Kobelke, Jens,Oh, Kyunghwan The Optical Society 2008 Optics letters Vol.33 No.24
<P>Two optical fibers with different types of air-hole imbedded structures were serially concatenated to provide novel transmission characteristics. Bending sensitive shifts of the fundamental mode cutoff in a hollow optical fiber and a hexagonal microstructured holey fiber were found to be in opposite directions, which defines a new window with flexible tuning of the center wavelength and the bandwidth of transmission by independent bending radii control of the fibers. The concatenated composite structure provided useful optical transmission window management ranging from 400 to 1700 nm along with a tunable pass bandwidth of 300-1000 nm and a sideband rejection efficiency better than 20 dB.</P>