• Journal of Korean Society of Coastal and Ocean Engineers
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• v.26 no.4
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• pp.225-243
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• 2014

As the economic matters are involved, applying the WEC, which is used for controlling waves as well as utilizing the wave energy on existing breakwater, is preferred rather than installing exclusive WEC. This study examines the OWC mounted on a pressurized air chamber floating breakwater regarding the functionality of both breakwater and wave-power generation. In order to verify the performance as a WEC, the velocity of air flow from pressurized air chamber to WEC has to be evaluated properly. Therefore, numerical simulation was implemented based on BEM from linear velocity potential theory as well as Boyle's law with the state equation to analyze pressurized air flow. The validity of the obtained values can be determined by comparing the previous results from numerical analysis and empirically obtained values of different shapes. In the actual numerical analysis, properties of wave deformation around OWC system mounted on fixed type and floating type breakwaters, motions of the structure with air flow velocities are investigated. Since, the wind power generating system can be hybridized on the structure, it is expected to be applied on complex power generation system which generates both wind and wave power energy.

• The Journal of the Acoustical Society of Korea
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• v.34 no.1
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• pp.36-45
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• 2015

Recently, a lot of studies have been made about the methods used to generate turbulent velocity fields stochastically in order to effectively predict broadband flow noise. Among them, the FRPM (Fast Random Particle Mesh) method which generates turbulence with specific statistical properties using turbulence kinetic energy and dissipation obtained from the steady solution of the RANS (Reynolds Averaged Navier-Stokes) equations has been successfully applied. However, the FRPM method cannot be applied to the flow noise problems involving intrinsic unsteady characteristics such as centrifugal fan. In this paper, to effectively predict the broadband noise generated by centrifugal fan, U-FRPM (unsteady FRPM) method is developed by extending the FRPM method to be combined with the unsteady numerical solutions of the unsteady RANS equations to generate the turbulence considered as broadband noise sources. Firstly, an unsteady flow field is obtained from the unsteady RANS equations through CFD (Computational Fluid Dynamics). Then, noise sources are generated using the U-FRPM method combined with acoustic analogy. Finally, the linear propagation model which is realized through BEM (Boundary Element Method) is combined with the generated sources to predict broadband noise at the listeners' position. The proposed technique is validated to compare its prediction result with the measured data.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.524-527
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• 2007

[ $Bi_2Sr_2Ca_{n-1}Cu_nO_x$ ](n=0, 1, 2) thin films have been fabricated by co-deposition at an ultra-low growth rate using ion beam sputtering(IBS) method. Bi 2212 phase appeared in the temperature range of 750 and $795^{\circ}C$ and single phase of Bi 2201 existed in the lower region than $785^{\circ}C$. Whereas, $PO_3$ dependance on structural formation was scarcely observed regardless of the pressure variation. And high quality of c-axis oriented Bi 2212 thin film with $T_c$(onset) of about % K and $T_c$(zero) of about 45 K is obtained. Only a small amount of CuO in some films was observed as impurity, and no impurity phase such as $ CaCuO_2$ was observed in all of the obtained films.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.4
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• pp.2844-2850
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• 2015

Rolling noise caused by the contact between the train wheels and rails is the main factor of noise generated by the operation of railway, therefore the features of rail vibration and its correlations with noise radiation should be identified. In this study, noise radiation generated from vibration were predicted by utilizing FE model with boundary element method. Noise radiation generated from vibration were predicted by utilizing FE model with boundary element method, and were compared with the measured noise in order to validate the reliability of the analysis method. In addition, the features of noise radiation according to the rail attenuation were examined in the frequency domain, and the noise radiation has been reduced by approximately 3dB(A) with additional rail damping.

• Journal of Legislation Research
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• no.44
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• pp.283-314
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• 2013

Das koreanische Verwaltungsprozessgesetz (KVwPG) wurde am 24. 8. 1951 kodifiziert. Es hat bisher mehrmals $ge{\ddot{a}}ndert$. Der Regierungsentwurf des KVwPG-${\ddot{A}}nderungsgesetzes$ vom 30. 3. 2013, ist fast $drei{\ss}ig$ jahre nach der Novellierung des KVwPGs 1984 erfolgt und auch spiegelt sich die Erfolge der $Bem{\ddot{u}}hungen$ in Literatur und Rechtsprechung wider. Aber es gibt nicht nur einige Unterschiede zwischen dem Regierungsentwurf und dem Entwurf der Kommission des Justizministeriums zur ${\ddot{A}}nderung$ des KVwPG (dem sog. Kommissionsentwurf), sondern auch der Regierungsentwurf ist theoretisch nicht problemlos. Vor allem sind Begriff und Umfang der neuen Klagebefugnis nicht klar. Des weiteren sind in ${\S}$ 12 des Regierungsentwurfs die Klagebefugnis mit dem $Rechtsschutzbed{\ddot{u}}rfnis$ identisch gesehen. Der $Rechtsschutzbed{\ddot{u}}rfnis$ nach ${\S}$ 12 Satz 2 des Regierungsentwurfs kann aus meiner Sicht relativ eng ausgelegt. Die $Einf{\ddot{u}}hrung$ der Verpflichtugnsklage in den Regierungsentwurf ist sehr gut, aber es kann trotzdem als problematisch angesehen werden dass Feststellungsklage der Rechtswidrigkeit der Unterlassung und Anfechtungsklage gegen Ablehnung bestehen noch. Der Begriff der Unterlassung ist $unn{\ddot{o}}tig$ und auch strikt. $Vorl{\ddot{a}}ugier$ Rechtsschutz des Regierungsentwurfs ist unter dem Gesichtpunkt der Rechtsschutz der $B{\ddot{u}}rger$ noch zu verbessern, aber doch das Modell des japanischen Verwaltungsprozessgesetzes darf nicht befolgt werden. Aufbau und System des $vorl{\ddot{a}}ufigen$ Rechtsschutzes sind auch nicht eindeutig. Nach Gegenstand und Klageart muss das Institut des $vorl{\ddot{a}}ufigen$ Rechtsschutzes in Ordnung gebracht werden. Es ist nicht ${\ddot{u}}berzeugend$ dass die $Einw{\ddot{a}}nde$ gegen die $Einf{\ddot{u}}hrung$ der vorbeugenden Unterlassung mit dem Gewaltenteilungsprinzip und der $Eigenst{\ddot{a}}ndigkeit$ der Verwaltung erhoben sind. $Dar{\ddot{u}}ber$ hinaus ist ADR (Alternative Dispute Resolution) zu beachten. In Bezug darauf ist Rechtgrundlage $f{\ddot{u}}r$ Mediation in der Verwaltungsgerichtsbarkeit zu stellen.