• Korean Journal of Food Science and Technology
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• v.20 no.2
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• pp.225-230
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• 1988

Emulsion stability, viscosity, and oil particle size of mayonnaise, prepared at various egg yolk contents, were investigated. With increasing of the egg yolk ratio, emulsion stability became stronger, viscosity became higher, and oil particle size became smaller. Freezing stability of mayonnaise containing below 6.5% egg yolk was reduced significantly. Referring to vibration separation, it was observed that stability of mayonnaise containing 2% and 3.5% egg yolk was very low and containing over 5% egg yolk was stable relatively. Viscosity of mayonnaise, stored at $-10^{\circ}C$, was reduced significantly during first 24hrs. and then levelled off. Oil particle size of mayonnaise, stored at $-10^{\circ}C$, became larger with increasing the storage time and the tendency to change was apparent in the sample containing below 6.5% egg yolk.

• Journal of the Korean Recycled Construction Resources Institute
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• v.7 no.4
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• pp.302-309
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• 2019

This paper shows an experimental study for fundamental characteristics of alkali activated fly ash-slag cement paste exposed to seawater of 5℃. Fly ash and slag were blended in three different ratios; 6:4, 7:3, and 8:2. Activators (NaOH and Na2SiO3) used 5% of the binder weight. It was shown that as the fly ash substitution rate in creased, compressive strength and density decreased, and water absorption rate increased. The results of X-ray diffraction and thermogravimetry showed that hydration reactants formed in samples did not differ significantly, however, C-S-H gel increased as the slag substitution rate increased. It showed that mechanical properties of fly ash-slag cement pastes under 5℃ seawater condition were affected by the slag substitution rate rather than fly ash.

• Applied Biological Chemistry
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• v.40 no.5
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• pp.404-408
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• 1997

Enzymatically hydrolyzed vegetable protein (eHVP) was produced from soy protein using proteases, and the physicochemical properties were examined. Soy protein hydrolysate of 6% protein and 50% degree of hydrolysis was useful for the base of savory ingredients. The Maillard-reacted and flavoring compound-added hydrolysate had improved flavor. It was for enzymatically hydrolyzed soy sauces and dehydrated seasonings. ISP hydrolysate of low molecular weight $(MW{\sim}250)$ and high protein content (85%) was suitable for special uses such as infant diets, sports nutrition, and medical diets. The eHVP gave no limitation of dosage in the formulation as a flavor enhancer. The byproduct of protein hydrolysis was found to have high content of fiber (21%) and to have potential for the use as dietary fiber or bulking agents.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.07b
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• pp.714-717
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• 2004

알루미노 보로실리케이트계 유리 기본조성 중 알칼리 토류 산화물의 종류 및 함량 변화에 따른 저유전율/저 LTCC 배선 기판의 저온 소성 거동 및 유전 특성을 조사하였다 알칼리 토류 산화물의 종류 및 함량 변화를 통해서 LTCC의 적정 소성온도인 $875^{\circ}C$ 부근을 포함하는 넓은 대역으로 소성수축이 시작되는 온도를 제어할 수 있었으며 유리 프리트와 알루미나 필러의 배합 비율의 변화에 따른 소성거동 및 유전특성의 변화 거동을 조사하였다. 알칼리 토류 산화물 중 유리 조성내의 CaO의 함량이 증가할수록 유리전이점 및 연화점을 증가하는 경향을 보였으며, 알루미나 필러의 첨가량이 증가할수록 소성수축이 시작되는 온도영역은 상향되고 유전율 및 품질계수는 증가하였다. 알칼리 토류 산화물의 조성과 필러인 알루미나의 함량을 제어함으로서 $875^{\circ}C$에서 18% 이상의 선수축율과 유전율 $5.1\sim5.5$ 및 유전손실 0.1% 이하의 우수한 특성을 갖는 저온소결용 LTCC 배선 기판을 얻을 수 있었다.

• Journal of the Korean Recycled Construction Resources Institute
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• v.7 no.3
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• pp.187-193
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• 2019

Regarding physical absorption mechanism for fine particles(Dust), internal pore-bridging is a major parameter in porous media. In this paper, internal bridging pore system is invented through FA-based geopolymer and incorporated PLA (Polylactic Acid) fiber with biodegradability. With various mix proportions, compressive strength over 20MPa is obtained but PLA is little dissolved in the condition of NaOH 5mole and $30^{\circ}C$ of temperature, which was found that temperature rising accelerates PLA solubility. Within 24hours, beads type PLA is completely dissolved under $90{\sim}130^{\circ}C$ and NaOH 5~12mole of alkali. In room condition, geo-polymerization is limitedly occurs so that the internal pore after PLA dissolution is thought to be effective to absorption and storage of fine particles.

• Journal of the Korean Society of Hazard Mitigation
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• v.11 no.3
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• pp.91-96
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• 2011

The design, construction and management of underground facilities as infrastructure of nation should be properly carried out. One of reasons for underground facilitie's failure is a non-proper construction of backfill materials. This is common for circular underground pipes. A non-proper compaction is the cause of settlement and decrease of performance of underground facilities. The use of controlled low strength materials is an alternative to reduce the couple of failure problems. The flowability, self-cementation, and non-compaction are the major advantages to use the controlled low strength materials. In this research, couple of recycled materials, such as in-situ soil, water-treatment sludge, and crumb rubbers, were adopted. The basic properties of each materials were determined according to KS or ASTM. Also, couple of laboratory tests were carried out to get the design parameters for geotechnical and roadway area.

• Journal of the Korean Recycled Construction Resources Institute
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• v.7 no.1
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• pp.57-65
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• 2019

In this study, the quality characteristics of the mother material of panel were evaluated for the production of moss panel using alumina cement and biological characteristics and environmental impact characteristics of moss panel were evaluated. The ratio of W/B 10%, Vs/Vm 20% and foaming agent 0.5% were selected as the basic mixing ratio for the mother panel of moss panel through pretest and SAP was added to improve the moisture content of panel. The optimal mixing ratio of SAP was considered to be less than 0.5% considering the quality characteristics. Also, through the use of alumina cement, the pH of the panel could be lowered to 10~11. The panel was able to improve the surface roughness through the foaming agent, and it was confirmed that the SAP had an effect of improving the moisture content of the panel. For the environmental impact characteristics of the moss panel, the moss panel evaluated the carbon dioxide reduction performance and the fine dust cleaning performance.

• Applied Chemistry for Engineering
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• v.32 no.4
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• pp.449-455
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• 2021

Composite materials are substances that are configured to have excellent physical properties by combining the properties of a single substance, and are in the limelight as materials that exceed the performance of metals and polymers. However, it has the disadvantages of long cycle time and high unit price, and much research is being performed to overcome these disadvantages. In this study, we developed an epoxy resin curing agent that can shorten the time required for mass production of composite materials, and tried to expand the applicability of objections by imparting flame retardancy. The epoxy resin used as a basic substance utilized two types of bisphenol F and resorcinol structure, which was further modified using 9,10-dihydro-9-oxa-10-phosphaphenantrene-10-oxide (DOPO) to impart flame retardancy. Triethylphosphate (TEP) and bis [(5-ethyl-2-methyl-1,3,2-dioxaphosphorinan-5-yl)methyl] methyl phosphonate P,P'-dioxide (FR-001) were used as additives, seven kinds of compositions were blended, thermal characteristics (gelation time, glass transition temperature) and flame retardant performance were evaluated. We successfully developed an epoxy matrix that can be applied to high pressure resin transfer molding (HP-RTM) process.

• Journal of the Korean GEO-environmental Society
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• v.12 no.11
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• pp.13-21
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• 2011

To recover basic functions of river such as water control, irrigation, environment, culture, a national river improvement project, the four river restoration projects were currently planned and under construction in Korea. This project is designed to preserve cultural assets and ecosystem from flooding, for that reason, environmentally friendly materials of construction are strongly emphasized. In this study, the soil and cement admixtures are developed. And, the compaction test and the unconfined compressive strength test to evaluate applicability of probiotics as environmentally friendly materials are conducted the soil and cement admixtures. As a result, the probiotic culture was not active in completely dried specimen to obtain accurate mixing proportion. It indicates that the probiotics cannot influence on the development the soil and cement admixtures. A further research will focus on the effect of response between polysaccharide environmentally friendly soil stabilizer and natural specimen.

• Journal of the Korean Applied Science and Technology
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• v.38 no.6
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• pp.1533-1542
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• 2021

Eco-friendly polyurethane can be defined as a highly utilized material used in various fields. The various structural properties of the synthesis of isocyanates and polyols provide versatility and customization for use in the manufacturing field. The characteristics of polyurethane vary widely from soft touch coatings to hard building materials like rocks. These mechanical, chemical and biological properties and ease of alignment are drawing tremendous attention not only in the field of research but also in related industries. In order to improve the performance of water-dispersible polyurethane materials, it can be derived through processes such as adjusting the blending of raw materials and adding additives and nanomaterials. This study highlights the basic chemical structure of eco-friendly water-dispersible polyurethane in the fields of medical science, automobiles, coatings, adhesives, paints, textiles, marine industries, wood composite materials, and clothing.