• Proceedings of the KSR Conference
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• 2011.10a
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• pp.2539-2547
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• 2011

This paper will introduce the safety authorization system for light rail transit(LRT) through investigating safety certification & safety authorization in foreign country and aviation field in Korea. The safety authorization system proposed by the government these day was also investigated. Korea Transportation Safety Authority(KOTSA) have conducted safety validation process on Busan-Gimhae LRT before its revenue service during three months since Jan. of 2011. We describe the overview of these validation activities, results and safety certification issued. Learning from this process, we propose the standardized safety validation process including checklists which can be applied to common unmanned light rail system. This study will be a basis of railway safety authorization for LRT and will be continually improve its application ability by the future study.

• Journal of Mechanical Science and Technology
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• v.18 no.8
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• pp.1470-1478
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• 2004

In this paper, a new 'presumed' Probability Density Function (PDF) approach coupled with a Lagrangian tracking method is proposed for turbulent combustion modeling. The test and the investigation of the model are conducted by comparing the model results with DNS data for a premixed flame subjected in a decaying turbulent field. The newly constructed PDF, which incorporates the instantaneous chemical reaction term, demonstrates consistent improvement over conventional assumed PDF models. It has been found that the time evolution of the mean scalar, the variance and the mean reaction rate are strongly influenced by a parameter deduced by a Lagrangian equation which takes into account explicitly the local reaction rate. Tests have been performed for a moderate Damkohler number, and it is expected the model may cover a broader range of Damkohler number. The comparison with the DNS data demonstrates that the proposed model may be promising and affordable for implementation in a moment-equation solver.

• Knowledge Management Research
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• v.5 no.1
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• pp.57-67
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• 2004

An air traffic control organization will require knowledge management to keep competitive advantage. A traffic controllers are forced to share their tacit as well as explicit knowledge among their organization to get aircraft's safety and efficient operation. The purpose of this study is to examine which factors influence the air traffic controllers' intention of sharing knowledge for the case of Civil Aviation Safety Authority, Ministry of Construction and Transportation. An ANOVA analysis shows that a difference exists between ages in terms of open mindedness towards sharing knowledge, the search for new knowledge and the recognition of the importance of sharing knowledge.

• Journal of IKEEE
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• v.22 no.2
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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.

• Journal of Aerospace System Engineering
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• v.10 no.1
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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.

• Journal of the Korean Society of Industry Convergence
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• v.13 no.1
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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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• v.17 no.5
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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.

• Journal of the Korea Safety Management & Science
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• v.16 no.2
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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.

• Speech Sciences
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• v.8 no.3
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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.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.50 no.1
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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.