• Journal of Animal Science and Technology
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• v.47 no.6
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• pp.1033-1040
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• 2005

Protein function of ovotransferrin with various pH and temperature, and its antimicrobial characteristics were determined. Foaming ability of ovotransferrin was high in alkali condition (pH 11), then diminished as time follows. In acidic condition (pH 3.0), very little amount of foam was produced and disappeared promptly in 30min. However, neutral condition (pH 7.0) was revealed as the best area for foam production and foam stability of ovotransferrin. Temperature effect on foam stability of ovotransferrin showed that the highest foam was produced at 60℃. Ovotransferrin was shown weak antimicrobial activity against E. Coli, S .typhi, P. aerug and Candida albicans at dose of 12.5mg/ml and 25mg/ml. Anti-microbial effect of ovotransferrin with either lysozyme or albumine on pathogenic bacteria and fungi shows that the most effective dose was 25mg/ml, especially on S. typhi and C. albicans.

• Journal of the Korean GEO-environmental Society
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• v.18 no.5
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• pp.27-33
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• 2017

In this research, laboratory tests were carried out to investigate the engineering properties of Light-Weight Air Foamed Soil (LWAS) based on silty clays with the animal foaming agent and cement. LWAS has been used as an embankment material over soft ground for road and side extension of the existing road. In field, unit weight and flow value is measured right after producing in mixing plant in order to control the quality of LWAS, and laboratory tests are carried out to confirm the quality through compressive strength of LWAS as well. In this research, direct estimation of the specification requirement of strength using flow values in field is the main purpose of the study together with other characteristics. From the test results, it can be seen that flow values increase with the initial water content and unit weight increases with the depth due to material segregation. Compared to the upper specimen, lower end of 60 cm specimen shows about 2 times higher compressive strength. Relationship between flow values and normalized factor presented by Yoon & Kim (2004) was presented. With that relationship, compressive strength can be predicted from flow values in field. From the relationship, the normalized factor was calculated. Thereafter calculated compressive strengths according to the flow values were compared to measured strengths in the laboratory. The higher the initial water content of the dredged soil has, the better relationship between predicted and measured shows. Therefore it is necessary to predict the compressive strength in advance through the relationship between the flow value and the normalized factor to reflect it in the design stage.

• Conservation Science in Museum
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• v.13
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• pp.59-69
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• 2012

The flower type ornament of the gilt bronze palace-type sarira reliquary among those sarira reliquaries of the East Pagoda at the Gameunssa Temple Site, which is the Treasure No. 1359 owned by the National Museum of Korea, was separated from the sarira reliquary in November 2010, thus conducting conservation treatments to be done on two items including the gilt bronze palace-type sarira reliquary during the period of March-October 2011. Those conservation treatments were carried out by following the process of removing the coated areas having excessive gross and bubbles, re-coating with Incralac, and then strengthening both the cracked areas and the separated flower-type ornaments with woven glass fiber after rejoining. For those areas where removal of gloss and bubbles at the coating and adhesive areas was not possible, the gloss and bubbles were made less perceivable through matting treatment and coloring.

• Korean Journal of Human Ecology
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• v.4 no.1
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• pp.62-67
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• 2001

Effects of irradiation on the physical and functional characteristics of egg whites were investigated. Fresh shell eggs were irradiated at 0, 0.5, 1.0, 2.0 and 3.0kGy. Egg whites were separated from eggs kept at 3$0^{\circ}C$ for 2hr. There was a considerable decrease in viscosity of egg whites with irradiation. Irradiation made egg whites darker and less greenish. The foaming properties including foaming ability and stability were examined. Irradiation led to increase in whipping power and decrease in drainage in an irradiation dose-dependent manner. These results showed that irradiated egg whites had good foaming ability and stability.

• Journal of the Korean Society of Visualization
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• v.2 no.1
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• pp.39-45
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• 2004

A time-resolved two-phase PIV system using a single camera has been developed, which introduces a method of image separation into respective phase images, and is applied to freely rising single bubble. Gas bubble, tracer particle and background have different gray intensity ranges on the same image frame when reflection and dispersion in the phase interface are intrinsically eliminated by optical filters and fluorescent particles. Further, the signals of the two phases do not interfere with each other. Gas phase velocities are obtained from the separated bubble image by applying the two-frame PTV. On the other hand, liquid phase velocities are obtained from the tracer particle image by applying the cross-correlation algorithm. As a result, the bubble rises rectilinearly just after it is released from an injector and then has a zigzag motion in the far field. From the trajectory of the bubble, it is found that the period of the zigzag motion is closely related to the vortex shedding although the wavelength of it varies along its movement.

• Journal of the Korean Society of Food Science and Nutrition
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• v.27 no.1
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• pp.46-50
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• 1998

This study was peformed to improve extraction of insoluble proteins and to evaluate funtional properties of abolished proteins by the phytase produced by Asporgillus sp. The optimum pH, temperature, treatment time and unit of the enzyme for extraction of protein were pH 4.0~5.0, $50^{\circ}C$, 8~10 hrs and 120 units. The foaming capacity and foaming stability of sesame meal protein after enzyme treatment were virtually unchanged as compared to control. The emulsion capacity and emulsion stability of sesame meal protein was higher than control. Oil absorption as well as water absorption capacities of sesame meal protein were higher than control.

• Journal of Hydrogen and New Energy
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• v.23 no.5
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• pp.538-544
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• 2012

The bubbles made of hydrogen and oxygen gases producted by electrolysis disturb the electrolysis, but the behavior of these bubbles in the electrolysis stack isn't clearly defined. In order to study on the behavior of bubbles in the flow pattern of the meshes type separator, the flow visualization experiment was performed by using of a visible alkaline electrolysis stack and a stereoscopic microscope. As the results, a fine size bubbles adhered to the separator's surface in the electrolyte solution have grown large sized bubbles until each bubble's buoyance is lager than the sum of surface adhesion force and weight. And then the large bubbles flow into the upper area of the separator. Also, as wide area of the separator have been occupied by various sized bubbles, the electrolysis efficiency is declined.

• Applied Chemistry for Engineering
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• v.18 no.3
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• pp.239-244
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• 2007

For the simultaneous methane recovery and $CO_2$-stripping, we have been developed dual vent auto circulation bubble lift column reactor, and evaluate optimum conditions for monoethanolamine (MEA) solutions as a $CO_2$ absorbent. At the 5 wt% MEA solution, we investigated the pH change during $CO_2$-stripping and absorption reaction, $CO_2$-stripping rate with reaction time, methane recovery efficiency for various inflow rates of air, $CO_2$-stripping rate for flow liquid over flow height, and $CO_2$-stripping dependency on the temperature of absolvent solutions. The suggested optimum conditions for $CO_2$ recovery with MEA in the dual vent auto circulation bubble lift column reactor were 40 mm over flow liquid height, 1.5 L/min of air inflow rate, and $25^{\circ}C$ of absorbent solution temperature.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.284-285
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• 2000

분산된 공기 기포에 의해 고형물을 제거하는 포말분리법은 30 $\mu\textrm{m}$이하의 미세 입자와 용존 고형물을 매우 효율적이면서도 경제적으로 운전을 할 수 있고 연속 운전이 가능하며 역세척이 필요 없다는 장점을 지니고 있다((Clarke and Wilson. 1983). 현재 사용되고 있는 포말분리장치는 공기의 공급방식과 유체과 공기의 접촉방향에 따라 항류 공기구동식(counter current air driven type, CCAD), 고속 폭기식(high speed aeration type, HSA), 벤튜리식(venturi type) 등이 있으나 현재까지 우리나라에서 연구되어 오고있는 포말분리 장치는 공기구동 방식이 전부이다. (중략)

• Journal of Environmental Impact Assessment
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• v.28 no.3
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• pp.332-345
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• 2019

The purpose of the study is to evaluate the treatability of contaminated groundwater with TPH and (or) $Cr^{6+}$. Laboratory scale tests were performed for oil/water separation, dissolved air flotation (DAF), coagulation and precipitation, and filtration with sand and activated carbon respectively. Two times of oil/water separation tests for total 40 minutes of separation or separating time shows 90.2 % of TPH removal rate. In case of DAF test for high TPH sample, the TPH removal rates were not varied significantly by the variation of microbubble size. However, tests for low TPH samples show that TPH removal rate increases as microbubbles are smaller. When coagulant was added to sample for DAF test, TPH removal rate was increased 12.3 %. SS removal rate by DAF was 97.9 % at $16-40{\mu}m$ and it was increased as the size of microbubble is reduced. Tests for coagulation and precipitation were performed to evaluate the removal of $Cr^{6+}$ in groundwater. The increase of $FeSO_4$ dosage increased $Cr^{6+}$ removal rate in the coagulation and precipitation process. As the amount of activated carbon in the filter media increased TPH removal rate in the filtration process. SS removal rate by the filtration was 96.7 % similar to the results of DAF process tests. The filtration process treats TPH and SS. Best design parameters are determined as the size of sand is $425-850{\mu}m$ and the ratio of activated carbon and sand is 50:50.