• Korean Journal of Food Science and Technology
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• v.44 no.5
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• pp.568-576
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• 2012

Baksulgi with various sugar substitutes was prepared and characterized for physicochemical and sensory qualities. The 10% sugar in a control baksulgi was replaced with 16.1% glucose, 13.3% erythritol, 10.2% xylitol, 0.2% stevioside (enzymatically modified stevia 100%), 0.05% aspartame, or 1.2% sucralose. Instrumental and sensory analyses indicated that the baksulgi with glucose was significantly different in color from the others, which was attributed to high susceptibility to browning reaction of the glucose. Baksulgi with aspartame showed significantly lower pH than that of control baksulgi, suggesting that the aspartame might have been hydrolyzed into its constituent amino acids under elevated steaming temperature. A sensory evaluation revealed that baksulgi with sucralose or xylitol was comparable to the control baksulgi in all sensory characteristics. However, the baksulgi with sucralose showed appreciably increased hardness with increased storage time at $4^{\circ}C$, partially due to the anhygroscopic property of sucralose.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2007.11a
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• pp.41-41
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• 2007

타겟-모재간 거리를 변수로 하여 마그네트론 스퍼터링법에 의해 CrN 박막을 합성하고 미세구조 및 물성을 평가하였다. 타겟-모재간 거리 85mm 및 180mm에서 CrN 박막을 합성하였으며, 합성된 코팅막의 내식 특성을 평가하기 위해 양극분극시험을 수행하였다. 타겟-모재간 거리 변화에 따른 미세구조 변화를 관찰하기 위해 주사전자현미경을 이용하여 박막의 파단면 조직을 관찰하였으며, XRD 분석을 통해 상천이 거동을 관찰하고 이를 물성 결과와 비교 분석하였다.

• Proceedings of the KSME Conference
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• 2005.11a
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• pp.21.2-21.2
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• 2005

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.453-454
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• 2004

수십 kHz 주파수 대역에서 수중음향 투과 특성이 우수하며 기계적 물성 또한 우수한 수중음향 윈도우 재료를 개발하기 위하여 이층 구조를 가지는 폴리우레탄 시편을 제조하였으며 제조된 시편의 기계적 물성 및 수중음향 특성을 평가하였다. 이층 구조 폴리우레탄은 음향 투과 특성은 떨어지나 기계적 물성이 우수한 보호층과 기계적 물성은 떨어지나 음향 투과 특성이 우수한 음향투과층으로 이루어져 있으며 무접착 성형 방법을 이용하여 성공적으로 제조하였다. 제조된 이층 구조 폴리우레탄 시편은 보호층의 도입으로 표면 경도가 60 (shore A) 이상이었으며 감쇠 계수는 1.0dB/cm 내외를 나타내었다.

• Korean Journal of Soil Science and Fertilizer
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• v.32 no.1
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• pp.84-89
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• 1999

A simple cultivation method using Jew's mallow (Corchorus olitorius L.) was examined to evaluate the biological quality of 72 upland soils collected from greenhouses in Korea. Each soil was mixed with 4-fold volume of sterilized basal soil having no indigenous chemical and physical problems to lessen the chemical and physical variations among original sample soils. This study assumes that the biological characteristics of each mixture 2 weeks after treatment reflect those of individual sample soil prior to treatment. Jew's mallow (Corchorus olitorius L.) was cultivated for 4 weeks in a pot filled with 250g of each experimental soil and the biological quality of each soil was estimated by the aboveground plant growth. The results indicated that microbial floral quality was explicitly deteriorated in 18 soils having EC above or equal to $5dS\;m^{-1}$. However, in soils having EC below $5dS\;m^{-1}$, some showed a sign of deterioration, while others did not. As this simple method is a kind of bioassay, it dose not require the measurements of microbial numbers and activities.

• Journal of Korean Tunnelling and Underground Space Association
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• v.21 no.4
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• pp.501-518
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• 2019

The rock properties measured under in-situ geological condition can be used to increase the reliability in numerical simulations with regard to the long-term performance of a high-level waste repository. In this study, the change in mechanical properties of KURT (Korea atomic energy research institute Underground Research Tunnel) granite was evaluated under the simulated THM (Thermo-Hydro-Mechanical) coupled condition due to a deep geological formation in the disposal repository. The rock properties such as uniaxial compression strength, indirect tensile strength, elastic modulus and Poisson's ratio were measured under the coupled test conditions (M, HM, TM, THM). It was found that the mechanical properties of KURT granite is more susceptible to the change in saturation rather than temperature within the test condition of this study. The changes in uniaxial compression strength and indirect tensile strength from the rock samples of dried or saturated conditions showed the maximum relative error of about 20% and 13% respectively under the constant temperature condition. Therefore, it is necessary to use the material properties of rock measured under the coupled THM condition as input parameters for the numerical simulation of long-term performance assessment of a disposal repository

• Cement Symposium
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• no.22
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• pp.14-22
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• 1994

• Korean Journal of Food Science and Technology
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• v.24 no.3
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• pp.294-299
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• 1992

This study was to examine the effect of functional properties of soy protein isolate(SPI) and qualities of soybean curd upon proteolytic hydrolysis. SPI was hydrolyzed using proteolytic enzyme, bromelain. The protein content of SPI by microkjeldahl method was 84% and the degree of hydrolysis in modified soy protein isolate(MSPI) was 2.7%. The solubility of MSPI was higher than that of control at various pH tested and proteolytic hydrolysis was increased emulsion formation and foam expansion while decreased emulsion stability, foam stability and calcium precipitation. Modified soybean curdI, standard soybean milk: Modified soybean milk=3:1, was soft and springy soybean curd when the texture properties of soybean curd were tested by texture profile analysis using Instron and sensory evaluation. The rheological model of soybean curds was investigated by stress relaxation test. The analysis of relaxation curve revealed that the rheological behavior of soybean curds could be expressed by 7-element generalized Maxwell model. The equilibrium modulus and modulus of elasticity decreased as the ratio of modified soybean milk was increased.

• Composites Research
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• v.24 no.5
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• pp.17-22
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• 2011

Recently transparent electrodes using carbon nanotube (CNT) have been studied actively to replace conventional ITO. In this work, CNT or ITO coated poly(ethylene terephthalate) (PET) were prepared by controlling the surfaces since the cohesion degree depends upon drying conditions. As transparent electrode application, 3 drying temperatures were set as 20, 80, and $120^{\circ}C$ to produce the change of surface properties. Interfacial durability and electrical properties of prepared transparent electrodes were evaluated by electrical resistance measurement. Surface change with changing drying temperature was observed by FE-SEM, whereas the transparency change was measured by UV-spectroscopy. The electronic properties of nanoparticle coated surface were evaluated using cyclic voltametry method upon the surface change with controlled drying temperature. Durability of CNT coated surfaces was better than ITO coated ease. As drying temperature increased, better coated surface was prepared due to improved cohesion among nanoparticles, which resulted in increased electrical properties.

• Journal of Adhesion and Interface
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• v.14 no.2
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• pp.75-81
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• 2013

Epoxy matrix based composites were fabricated by adding SiC nano fillers. The interfacial properties of composites were varied with different shapes of SiC nano fillers. To investigate the shape effects on the interfacial properties, beta and whisker type SiC nano fillers were used for this evaluation. The dispersion states of nano SiC-epoxy nanocomposites were evaluated by capacitance measurements. FE-SEM was used to observe the fracture surface of different structures of SiC-epoxy nanocomposites and to investigate for reinforcement effect. Interfacial properties between carbon fiber and SiC-epoxy nanocomposites were also evaluated by ILSS (interlaminar shear strength) and IFSS (interfacial shear strength) tests. The interfacial adhesion of beta type nanocomposites was better than whisker type.