• 한국소음진동공학회논문집
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• 제15권9호
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• pp.1045-1052
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• 2005

Tn this paper. dual rotor disk configuration with a coreless stator is proposed for the Lorentz force type integrated motor hearing system. An experimental compensation for the effects of high order harmonics is performed using the digital controller of the experimental setup. The runout profile and rotor unbalance are also identified by the extended influence coefficient method. The experimental results confirm that this compensation scheme effectively attenuates the rotor vibration all over the operating range of rotational speed.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 춘계학술대회논문집
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• pp.970-973
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• 2006

The effects of the additional visual and auditory stimuli on the loudness evaluation of road traffic noise was investigated by the method of magnitude estimation. As a result, it was shown that additional visual stimulus of noise barrier can influence on the loudness perception of road traffic noise. Also, additional auditory stimuli such as green music or sound of flowing water can influence on the loudness perception of road traffic noise. approximately $5{\sim}10%$ lower than the absence of stimuli. But this effect was disappeared in the range of over 65dB(A).

• 디자인학연구
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• 제3권1호
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• pp.71-81
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• 1990

Style have been changing by the situations and the background of contemporary politics, society and economics, and which influence significantly to create new forms. Since the style of ART DECOC 1929s -1930s) has been studied with main reference to its cause and motivation, it is known that the style of ART DECO is one that has given $$\mu$h potential and chance to the development of interior design.In the study, it was focussed on to study on interior design, architecture, funiture, etc. in America where ART DECO had been once successful in his career. The following are the contents of the study implying the establishment of directions concerning styles in accordance with the transitional process of the era, etc.; i.e., the purpose of the study, the range + period of the study, contemporary backgrounds, elements of ART DECO' style, ART DECO in AmericaCthe background of ART DECO s subject, etc.).The writer of this study, while referring to the study and groping for any help to finding a brilliant concept of design and the merit of the trend of a contemporary era, hope to contribute more my own interior design.

• 대기
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• 제18권2호
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• pp.83-95
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• 2008

In this study we have investigated the preceding eighteen large-scale climate indices with a lead time from zero to twelve months that have an influence on the variability of temperature and precipitation in Korea in order to understand which climate indices are overall available as predictors for long-range forecasting. We also have studied the dynamic link between preceding large-scale climate indices and regional climate using singular value decomposition analysis (SVDA) and correlation analysis (CA). Based on the coupled mode between large-scale circulation and regional climate, and correlation pattern between the preceding large-scale climate indices and large-scale circulation, the level of significance on climate indices as a predictor for monthly mean temperature and precipitation was evaluated for 5 and 1% level.

• 한국세라믹학회지
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• 제31권9호
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• pp.1053-1059
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• 1994

The influence of ZrO2 addition on microstructre and mechanical strength of magnesia ceramics were discussed. ZrO2 was existed as a cubic phase resulted from MgO solubility into ZrO2 on firing at temperature range from 130$0^{\circ}C$ to 1$600^{\circ}C$ for 2 h. The addition of ZrO2 markedly promoted the densification of MgO also above 150$0^{\circ}C$ and the sintered density at 1$600^{\circ}C$, 2 h reached to 95.2% of the theoretical. The solubility of MgO into c-ZrO2 was about 7.68 wt% and it was segregated at grain boundary on cooling to room temperature. ZrO2 existing as a second phase retarded the grain growth of MgO. The bending strength were increased to 240 MPa with the amount of ZrO2.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1998년도 봄 학술발표회 논문집
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• pp.301-308
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• 1998

This paper deals with the influence of elastic foundations on natural frequencies of curved beams. Taking into account the effects of rotatoy inertia and shear deformation, the differential equations governing free, out-of-plane vibrations of circular curved beams resting on Winkler-type foundations are derived and solved numerically. Hinged-hinged, hinged-clamped and clamped-clamped end constraints are considered in numerical examples. The lowest three natural frequencies are claculated over a range of non-dimensional system parameters: the horizontal rise to span length ratio, the slenderness ratio, the foundation parameter, and the width ratio of contact area between the beam and foundation. The effects of rotatory inertia and shear deformation are also analyzed.

• 한국표면공학회지
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• 제29권5호
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• pp.449-453
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• 1996

In order to improve EL performance, anthracene was doped into the 8-hydroxyquinoline-aluminum (Alq$^3$) light-emitting layer of organic double layered EL cells. The EL cells were fabricated on ITO glass substrates by vacuum deposition. Doping of anthracene to the light-emitting $Alq^3$layer was performed by means of co-evaporation. The doping concentration was changed in the range of 5 to 30 wt.%. It was confirmed that anthracene doping of appropriate concentration increased the available current density and brightness of the EL cells. Carrier mobility of the $Alq^3$ layer was measured by time of flight method. The influence of anthracene doping on the cell performance was discussed.

• 동력기계공학회지
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• 제22권6호
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• pp.5-10
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• 2018

Nuclear energy issues such as safety and social acceptance can not only influence the production costs of generating nuclear power, but also the external costs that are not reflected in market prices. Consequently, the social issues affiliated with nuclear power, beyond a severe accident, require some form of financial expense. The external social issues considered here are accident risk and realization, regulatory costs, and nuclear energy policy costs. Through several calculations and analyses of these external costs for nuclear power generation, it is concluded that these costs range from 7 to 27 \/kWh. Considering external costs are required for making energy plans, it could have an influence on generation costs.

• Bulletin of the Korean Chemical Society
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• 제16권5호
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• pp.458-461
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• 1995

The influence of adding counter-ion such as Na+ on the dimerization of the two sulphonated azo dyes, C.I. Acid Red 14 and C.I. Acid Red 17 in aqueous media has been studied spectrophotometrically. The observed hypochromic effect on increasing the amount of salt has been described. The dye concentration range where the dimerization equilibrium is applicable was chosen. No metachromatic behaviour was observed on changing the dye concentration and the amount of salt. This behaviour was attributed to the ability of the counter-ion to disrupt the structure of water as well as reducing the electrostatic repulsion forces between dye anions which will lead to the increase of aggregation tendency of the dye species.

• Advances in concrete construction
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• 제4권1호
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• pp.37-47
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• 2016

The objective of the present work is to evaluate the influence of two different methods of improving the ductility of Reinforced Concrete Frames and their influence on the full range behavior of the frames with M40 grade of concrete. For this purpose one fourth scale reinforced concrete square frames are experimentally tested subjected to static cyclic loading for three cases and monotonic loading for one case. The parameters are varied as method introducing ductility to the frame viz. (i) by using conventional concrete (ii) adding 1% of steel fibres by volume of concrete at hinging zones (iii) using self-compacting concrete with fibres at hinging zones. The energy absorption by ductile and non-ductile frames has been compared. The behavior of frames tested under cyclic loading have revealed that there is a positive trend in improvement of ductility of frames when fibrous concrete is used along with self-compacting concrete.