• 전기전자학회논문지
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• 제22권2호
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• pp.446-454
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• 2018

In this work, we summarize the calculation processes of obtaining a scattering factor using with the equilibrium average projection scheme (EAPS), with moderately weak coupling (MWC) interaction, and obtain the line-shape formula of an electron-deformation phonon interacting system interested in the confinement of electrons by squarwell confinement potentials in quantum two dimensional system.. Through the numerical analysis, we analysis the magnetic dependence of absorption power, P(B) in several temperature and frequency difference dependence of absorption power $P({\Delta}{\omega})$, in several external field, where ${\Delta}{\omega}={\omega}-{\omega}_0$ and ${\omega}({\omega}_0)$ is the angular frequency (the cyclotron resonance frequency). The result of equilibrium average projection scheme (EAPS) in SER-MWC explains the properties of quantum transition quite well.

• 항공우주시스템공학회지
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• 제10권1호
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• pp.8-14
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• 2016

The optimal estimation of a bearing only target tracking problem be achieved through the solution of the Fokker-Planck equation and the Bayesian update. Recently, a nonlinear filtering algorithm using a direct quadrature method of moments in which the associated Fokker-Planck equation can be propagated efficiently and accurately was proposed. Although this approach has demonstrated its promising in the field of nonlinear filtering in several examples, the "degeneracy" phenomenon, similar to that which exists in a typical particle filter, occasionally appears because only the weights are updated in the modified Bayesian rule in this algorithm. Therefore, in this paper to enhance the performance, a more stable measurement update process based upon the update equation in the Extended Kalman filters and a more accurate initialization and re-sampling strategy for weight and abscissas are proposed. Simulations are used to show the effectiveness of the proposed filter and the obtained results are promising.

• 한국산업융합학회 논문집
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• 제13권1호
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• pp.41-47
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• 2010

The carbon fiber reinforced plastics, one of unidirectional fiber-reinforced composite materials, are widely used in various field including space and aviation industries, sports and leisure industries and general structural members and parts as have high strength in comparison with the weight, elasticity coefficient, high fatigue strength and lower thermal transformation. This paper present analytical behavior of CFRP pipe reinforced rib under the external force. From the results, the maximum compressive stress occurs at the upper flange of CFRP pipe and tensile stress occurs middle flange of the CFRP pipe. The stress of rib CFRP pipe by increasing effective cross-sectional area was reduced by approximately 35%.

• Journal of Mechanical Science and Technology
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• 제17권5호
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• pp.726-739
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• 2003

A multi-dimensioanl model is being increasingly used to predict the thermo-flow field in the gas turbine combustor. This article addresses an integrated survey of modeling of the liquid spray formation and fuel distribution in gas turbine with high-shear nozzle/swirler assembly. The processes of concern include breakup of a liquid jet injected through a hole type orifice into air stream, spray-wall interaction and spray-film interaction, breakup of liquid sheet into ligaments and droplet,5, and secondary droplet breakup. Atomization of liquid through hole nozzle is described using a liquid blobs model and hybrid model of Kelvin-Helmholtz wave and Rayleigh-Taylor wave. The high-speed viscous liquid sheet atomization on the pre-filmer is modeled by a linear stability analysis. Spray-wall interaction model and liquid film model over the wall surface are also considered.

• 대한안전경영과학회지
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• 제16권2호
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• pp.157-165
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• 2014

The interest about sustainable development of airport operation field has been increased as the aviation industry has been gradually developed and the influence to the neighboring area of airport has been increased. International organization and airport operator have issued a guidance manual with regard to the sustainability specialized in airport by adopting environment friendly rating system and developing a variety of sustainable practices. In this study, the guideline of sustainability manual appropriate to the local airports will be suggested by reviewing a variety of reference documents issued from foreign airport operators.

• 음성과학
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• 제8권3호
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• pp.105-113
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• 2001

The abbreviation (specially, an acronym) are used more nowadays. However we are using them carelessly unknowing that there are some reducing patterns. In this paper, we will first analyse the right oralization and the phonemicization of abbreviation on the basis of the group types. Then, we will propose necessary and sufficient conditions to recognize how to read or pronounce the acronyms and in which way, when they are converted from the text to the speech. We have limited the use of acronym to the graphem-phoneme relations, and the diversity of the usage to minimized, and therefore we could define clearly the characteristics of the phonetic chains. In conclusion, we could find that there are more phonemicization in producing acronyms with these phonetic chains characteristics, and these phonetic based acronyms are increasingly used in the field of aviation and medicine.

• 대한전기학회논문지:시스템및제어부문D
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• 제50권1호
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• pp.8-13
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• 2001

LMS algorithm has been used for plant identifier and noise cancellation. This algorithm has been researched for performance enhancement of filtering. The design and development of a reliable system has been becoming a key issue in industry field because the reliability of a system is considered as an important factor to perform the system's function successfully. And the computing with reliability and fault tolerance is a important factor in the case of aviation, system communication, and nuclear plant. This paper presents design of reliable adaptive filter with fault tolerance. Generally, redundancy is used for reliability. In this case it needs computing or circuit for voting mechanism, or fault detection. Therefore it has simple computing, and practicality for application. And in this paper, reliability of adaptive filter is analyzed. The effectiveness of the proposed adaptive filter is demonstrated to the case studies of plant identifier and noise cancellation by using DSP.

• 한국기계가공학회지
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• 제17권5호
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• pp.143-148
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• 2018

3D printing has been expanding beyond the bio/nano field to the automobile and aviation industries. 3D-printing technology has to overcome real problems to have economic value compared to its unlimited usability. Typically, the difference in mechanical strength along the lamination direction requires sufficient research to ensure reliability. In this paper, we study the anisotropic properties of ABS based on the stacking method of FDM 3D printing. Specifically, the mechanical properties of ABS material are determined through a tensile test and 3-point bending test, and the in-plane orthotropic properties are ascertained.

• International Journal of Internet, Broadcasting and Communication
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• 제13권3호
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• pp.73-83
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• 2021

With the development of science and technology, virtual reality (VR) has become increasingly popular, being widely used in various fields such as aviation, education, medical science, culture, art, and entertainment. This technology with great potential has changed the way of human-computer interaction and the way people live and entertain. In the field of animation, virtual reality also brings a new viewing form and immersive experience. The paper demonstrates the production of VR animation and then discusses camera's position in VR animation. Where to place the VR camera to bring a comfortable viewing experience. The paper, with the proxemics as its theoretical framework, proposes the hypothesis about the camera position. Then the hypothesis is verified by a series of experiments in animation to discuss the correlation between camera position and proxemics theory.

• 수완나부미
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• 제12권2호
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• pp.225-244
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• 2020

Area Studies, by definition, conjure ideas of emplaced knowledge; in-depth interdisciplinary understanding of language, history, culture and politics of a nation or region. Where detractors might see this approach as overly empirical, therefore precluding theoretical sophistication, others argue that "places" are either artificially constructed, or that processes of globalisation have obliterated the cultural zone. But what if we turn an ethnographic eye to those very processes and technologies themselves? Can Area Studies take to the air, and if so, what are the attendant challenges and benefits? Based on insights from ethnography amongst airline customer service workers, ground and cabin crews in Thailand and Myanmar, this research examines the airline cabin as a field for ethnographic study, and as an emplaced site for political and cultural processes. With participant observation-based knowledge of Southeast Asian cabin crews, this paper examines the 1990 hijack of Thai Airways TG 305 from an emplaced cultural perspective.