• Journal of the Korean institute of surface engineering
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• 제12권3호
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• pp.174-179
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• 1979

The effects of brightness, electrochemical behaviour on the organic additives, such as aldehydes, polymers, amines and condensed product obtained from epichlorohydrin and nicotinamide, in cyanide zinc electrolplating bath have been studied by controlled potential electrolyser. The results were summerized as follows: (1) It was found that the addition of only one compound of these organic compounds in the bath was unsuitable but mixture of anisaldehyde or monoethanolamine and condensed product as suitable as brightener. (2) The cathodic polarization curve of polymers or aldehydes in cyanide zinc electroplating bath was almost the same but the cathodic polarization curve of condensed product remarkable shifted to noble potential more than non-additive curve.

• Journal of the Korean Ceramic Society
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• 제26권4호
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• pp.550-558
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• 1989

Polycrystalline diamond films have been deposited on Si wafer Ly hot W filament CVD method using CH4H2 mixtures. The effects of surface pretreatment, W filament temperature, CH4 volume fraction, and addition of water vapor on the growth rate and morphology of the films were investigated. Surface pretretment was essential for depositing a continuous diamond film. Raising the filament temperature resulted in an increased growth rate and a better crystal quality of the film. As the methane content is varied from 0.5% to 5%, well-faceted crystals gradually transformed into spherical particles of non-diamond phase with a simultaneous increase in the growth rate. Addition of water vapor markedly improved the crystallinity to produce crystalline particles even with 5% methane mixture.

• Journal of ILASS-Korea
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• 제15권4호
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• pp.189-194
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• 2010

This study has been mainly motivated to numerically model the transcritical mixing and reacting flow processes encountered in the liquid propellant rocket engines. In the present approach, turbulence is represented by the extended k-$\varepsilon$ turbulence model. To account for the real fluid effects, the propellant mixture properties are calculated by using SRK (Souve-Redlich-Kwong) equation of state model. In order to realistically represent the turbulence-chemistry interaction in the turbulent non-premixed flames, the flamelet approach based on the real fluid flamelet library has been adopted. Based on numerical results, the detailed discussions are made for the real fluid effects and the precise structure of the transcritical cryogenic liquid nitrogen jet and gaseous hydrogen/liquid oxygen coaxial jet flame.

• YAKHAK HOEJI
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• 제45권3호
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• pp.302-309
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• 2001

Wheat germ agglutinin (WGA) pectin, which binds to human melanoma cell line, was conjugated with Praecoxin A using 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide as a cross-linking agent. Physical mixture (PM) of WGA and Praecoxin A was also prepared by using a non-specific binding property of Praecoxin A to WGA. The WGA:Praecoxin A ratio in the conjugate and PM was approximately 1:18 and 1:20, respectively. The results of hemagglutination assay and enzyme-linked lectin assay indicated that the conjugate and PM maintained the lectin-like properties of the WGA. The binding ratio of conjugate was about 70% during 4-24 hr, but the most of Praecoxin A was released within 24 hr in the case of PM. These results lead to the conclusion that the conjugate is potentially useful for the formulation of injection that requires targeting for melanoma as well as sustained release at the site.

• MALSORI
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• 제63호
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• pp.139-151
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• 2007

As the Internet becomes prevalent in our lives, harmful contents, such as phornographic videos, have been increasing on the Internet, which has become a very serious problem. To prevent such an event, there are many filtering systems mainly based on the keyword-or image-based methods. The main purpose of this paper is to devise a system that classifies pornographic videos based on the audio information. We use the mel-cepstrum modulation energy (MCME) which is a modulation energy calculated on the time trajectory of the mel-frequency cepstral coefficients (MFCC) as well as the MFCC as the feature vector. For the classifier, we use the well-known Gaussian mixture model (GMM). The experimental results showed that the proposed system effectively classified 98.3% of pornographic data and 99.8% of non-pornographic data. We expect the proposed method can be applied to the more accurate classification system which uses both video and audio information.

• Proceedings of the Korean Nuclear Society Conference
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• 한국원자력학회 1997년도 추계학술발표회논문집(1)
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• pp.495-500
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• 1997

For hydrogen management in severe accidents with degraded nuclear core of PWR's, several experiments have been performed in the SNU hydrogen mixing facility. The objectives are understanding the extent of hydrogen mixing and analyzing the effects of factors which dominate uniform or non-uniform mixing at compartments in the containment building. The facility represents on a 1/11th linearly scaled model of the YGN unit 3&4, hydrogen was simulated by helium. Because there are the gaps between safety injection tank and compartment layers in the containment, the test facility was constructed in three dimentinal mode for analyzing of mixture behavior through the gaps. From the experimental results we could conclude that overall hydrogen concentration distributed uniformly in the free volume of the test compartment, but fluctuated in the gaps. This paper is focused on experimental result from several experiment.

• Korean journal of food and cookery science
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• 제29권2호
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• pp.193-208
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• 2013

The purpose of this study was to investigate the characteristics and brewing methods of Danyangju, which is one of the traditional single brewed rice liquors using Korean ancient literatures publishes from the 1400's to 1600's. Total 32 Danyangju products and 55 brewing methods were found by reviewing the ancient literatures. Danyangju products could be classified into four groups depending on type of grain used: 1) 13 Danyangju products with non-glutinous rice, 2) 14 products with waxy rice, 3) 4 products with mixture of waxy and nonwaxy rice, and 4) 2 products with barley. In this paper, not only ingredients, formula and utensils needed for preparation of Danyangju, but also brewing characteristics and terminology were reviewed. The findings on Danyangju in this study would be useful to improve the brewing methods and quality of Korean traditional liquors.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• 제11권10호
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• pp.809-814
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• 1998

In this study, the metastable state diamond thin films have been deposited on Si substrates from methand-hydrogen and oxygen mixture usin gMicrowave Plasma Enhanced Chemical Vapor Deposition (MWPCVD) method. effects experimental parameters MWPCVD including methan concentrations, oxygen additions, operating pressure, deposition time on the growth rate and crystallinity were investigated. diamond thin film was synthesized under the following conditions: methane concentration of 0.5%(0.5sccm)∼5%(5sccm). oxygen concentration of 0∼80%(2.4sccm). operating pressure of 30Torr∼ 70Torr, deposition time of 1∼32hr. SEM, WRD, and Raman spectroscopy were employed to analyse the growth rate and morphology, crystallinity and prefered growth direction, and relative amounts of diamond and non=diamond phases respectively.

• Biotechnology and Bioprocess Engineering:BBE
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• 제8권3호
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• pp.167-172
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• 2003

Foam fractionation can be used to enrich a hydrophobic protein such as bromelain from an aerated dilute protein solution because the protein foams. On the other hand, a protein such as invertase, which is hydrophilic, is not likely to foam under similar aerated conditions. While a foam fractionation process may not be appropriate for recovering a hydrophilic protein alone, it is of interest to see how that non-foaming protein affects the foaming protein when the two are together in a mixture. The bromelain enrichment, activity and mass recovery were observed as a function of the solution pH in order to explore how invertase can affect the recovery of bromelain in a foam fractionation process.

• Advances in nano research
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• 제8권2호
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• pp.103-114
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• 2020

In this research, buckling and free vibration of rectangular polymeric laminate reinforced by graphene sheets are investigated. Various patterns are considered for augmentation of each laminate. Critical buckling load is evaluated for different parameters, including boundary conditions, reinforcement pattern, loading regime, and laminate geometric states. Furthermore, vibration analysis is investigated for square laminate. Elastic properties of the composite are calculated using a combination of both molecular dynamics (MD) and the rule of mixture (MR). Kinematics of the plate is approximated based on the first shear deformation theory (FSDT). The current analysis is performed based on the energy method. For the numerical investigation, Ritz method is applied, and for shape functions, Chebyshev polynomials are utilized. It is found that the number of layers is effective on the buckling load and natural frequency of laminates which made from non-uniform layers.