• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.06a
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• pp.563-565
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• 2013

해양플랜트 구난기술은 상당 부분 선박구난과 동일하여 수중절단, 인양, 계류, 기름의 이송 및 예인 등은 공통적으로 적용이 가능하다. 그러나 구조물이 복잡하고 대형이며, 심해 설치 등의 특성이 있으므로 해양플랜트 구난작업에는 유형별 구조에 대한 정확한 이해가 필요하다. 해양플랜트 설치, 이송 및 해체 분야에 대한 기술은 구난 분야에도 적용이 가능하므로 해양플랜트 특성에 적합한 구난기술 개발 방향을 제안하였다.

• Journal of Pharmaceutical Investigation
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• v.17 no.1
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• pp.38-40
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• 1987

To optimize the preparation condition of oil in water microemulsion rheological method was used. The viscosity-temperature curve of refined soybean oil was recorded and from this result microemulsion was prepared at various temperatures and evaluated by Coulter counter during 3 weeks. The difference in rheograms of crude emulsion and the microemulsion varying the number of passes in the homogenizer was also examined. From above experiments following conclusions were obtained. 1) Through all the process, temperature was an important factor and the optimum was $60-80^{\circ}C$. 2) By first pass in the homogenizer, most oil droplets were finely dispersed. 3) In the homogenizing step the higher pressure results in the finer dispersion but as the pressure goes up, the differential efficiency of dispersion was decreased.

• Journal of Pharmaceutical Investigation
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• v.16 no.2
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• pp.68-71
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• 1986

Oil in water microemulsion which has many pharmaceutical applications was prepared and evaluated. As oil sources and emulsifier, two grades of oil and egg phosphatide were used, respectively. Vacuum high shear mixing and high pressure homogenizing were performed and in the homogenizing step, effect of the number of passes in the homogenizer on the stability of microemulsion was studied, using Coulter counter, photographic microscope and pH-meter. From above results, it was concluded that the stability of microemulsion made of refined soy-bean oil was better than that of food grade soybean oil and by five passes in the homogenizer at 6,000 psi, we could make stable microemulsion with average particle diameter below $1\;{\mu}m$, with no particle above $5\;{\mu}m$ and no significant change during 6 weeks stored.

• YAKHAK HOEJI
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• v.39 no.5
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• pp.495-505
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• 1995

The O/W microemulsion systems were made from 2 or 4% (w/w) oil (soybean oil, olive oil or isopropyl myristate) and 10, 15 or 20% (w/w) Brij 96. They were compared with micellar solution of equivalent surfactant concentration m therms of physicochemical properties, and the solubilization of sudan IV. They were characterized by dynamic light scattering, stability, surface tension, viscosity and rheogram. The mean diameters of O/W microemulsion systems were 10-15nm, and those of Brij 96 micellar solutions were 18-19 nm. Both of them were monodisperse systems. The O/W microemulsion systems showed Newtonian flow and their apparent viscosities were lower than those of micellar solutions. The surface tensions of O/W microemulsion systems were increased or decreased depending on the types of oil used, when compared with those of micellar solutions. The O/W microemulsion systems were very stable, and did not show any flocculation or aggregation. Their mean diameters were not changed after three months. But oxidation was observed in microemulsions without nitrogen gas at high temperature. There was a significant improvement in the sudan IV solubffimtion in micromulsion compared with that m the micellar solution containing equivalent concentration of surfactant. The size distribution and mean diameters of O/W micromulsions were not changed when sudan IV was solubilized.

• Journal of Advanced Marine Engineering and Technology
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• v.38 no.3
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• pp.333-341
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• 2014

Since distribution and preservation of cultural artifacts in the submarine sediments are directly affected by not only ocean currents and tides, but also their composition, it is very important to investigate geological characteristics of sediments and ocean-sediment interactions for maritime archaeological survey. Physical properties of submarine sediments, which are collected by grab sampler and vibro-corer, are analyzed in order to investigate effects of submarine environment on development of maritime archaeological survey techniques. Result of physical property analysis showed that bulk density, shear strength, and magnetic susceptibility increase with depth, while water contents and porosity decrease with depth. Since the magnetic susceptibility of bedrock is about 40 times that of submarine sediments, it might impact greatly on the response of magnetic survey. Physical properties of sediments with depth and sediment classification by Folk's ternary diagram indicate that submarine sediment mainly consists of silt, and cultural artifacts can not penetrate no deeper than 1.5 m in sediments.

• Journal of Digital Convergence
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• v.18 no.10
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• pp.509-516
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• 2020

The purpose of this study was to examine the effects of a 12-week Resistance exercise Type on Muscle Damaged and Blood Lipid in elderly Women. Study shows researchers randomly divided thirty elderly women into the following 3 Groups such as Control group(CG: n=10), Aquatic Exercise Group(AEG: n=10), circuit exercise group(CEG: n=10). They made each group excercise 3 days a week for 12 weeks. The results were as follows. There was no interaction effect in the TC, LDL-C, HDL-C but there were interaction effects in the Body weight and Body Fat(%). The AEG and CEG decreased than the CG in the Body Weight, Body Fat(%), TC, LDL-C, and increased than the CG in the HDL-C with significant difference. These results were made certain that decreasing the Body Weight and Blood lipid, Increasing the Muscle and HDL-C for elderly women on AEG and CEG. The analysis results of study show the index of TG, CPK, LDH has no significant difference. Besides, It is considerable that the aquatic Exercise and Circuit exercise can prevent and improve the Sarcopenia for elderly women.

• Korean Journal of Heritage: History & Science
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• v.55 no.4
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• pp.6-22
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• 2022

In this paper classifies the types of 228 anchor stones discharged from the west and south coasts, assumes a combined method by type, routes through discharge locations, and It attempted to estimate the burial site. Prior to classification of types, the weight, thickness, width, and length of the anchor stone were measured, and the largest Young in the tomb The scent weight was classified into I~V groups, and the shape of the anchor stone was classified into 1-6 types. All of these weight and shape correlations It was classified into 17 types. The combined method by type is 180kg or less depending on the morphological characteristics of the reference value of the extracted anchor stone, and the type An anchor of type 1 or 2 is used in combination with an anchor, and a anchor of type 3 or 6 weighs more than 180kg and is combined with an anchor The dragon was assumed to be an anchor. Along with this, the route and burial site are identified through past records and testimony of local residents It was checked against the data. The route was largely consistent with past records, but the new route was apparent in waters near the island or inland It was also drawn. In the case of burial sites, small and large in Taean Mado Sea and Jindo Byeokpajin Sea, where anchor stones are concentrated, Considering the pattern of the type anchor stones being discharged, it was consistent with the testimony that ships of various sizes were mysterious in the two seas. Based on this type classification, a study on the spatiality of the anchors was conducted. First, a comparison and analysis was done on whether actual real data, such as anchor stones, old ships, and relics, were identified on the Joun-ro route and international trade routes as recorded in the past literature. Where there was no record, the route was estimated based on real data. To this end, routes estimated based on the testimony of local residents and modern ship workers were analyzed as to whether ships traveled there in the past and whether they could actually sail. Next, the location of each seedling was estimated by ship size according to the weight of the anchor stone. In the case of the Taean Mado Sea and Jindo Byeokpajin Sea, both small and large anchor stones were discharged from the coastline and were far away.

• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.1361-1365
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• 2004

오염물질의 유입 유형은 일정한 농도를 가진 오염물질이 일정한 비율로 연속적으로 유입되는 경우와 순간적으로 특정한 농도를 가진 오염물질이 하천으로 유입되는 경우로 나눌 수 있다. 본 연구에서는 오염물질에 대해 댐 방류량을 일시적으로 증가시켜서 희석 및 세척시키는 플러싱(flushing) 효과에 관하여 연구하였다. 실측한 수리인자를 이용하여 적용성이 크다고 발표된 경험식에 의하여 확산계수를 결정하였다. 플러싱에 의한 오염물질의 희석정도 및 확산특성을 파악하기 위해서 RMA-4 모형을 잠실수중보$\~$신곡수중보 구간에 적용하였다. 정체되어있는 경우와 순간적으로 유입되는 경우, 성산대교 부근에서 농도가 1ppm이하로 감소하는 시간을 각 유량별로 분석하였다. 댐 방류량에 의한 플러싱을 시도한 경우에 본류의 오염물질이 지류로 역류하는 범위를 파악할 수 있었다.

• Polymer(Korea)
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• v.28 no.1
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• pp.10-17
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• 2004

Poly(vinyl acetate) (PVAc) nanoparticles were synthesized in oil/water miniemulsion polymerization in the presence of low amount of hexadecane as a cosurfactant. The nanoparticles were tested to apply as a drug carrier. The shape of nanoparticles was observed by scanning electron microscopy, and the average particle size and size distribution were examined by particle size analyzer. Inclusion of antibiotic drugs into the nanoparticles was confirmed by CHO, C=O, and OH peak of FT-IR. Size of the nanoparticles were adjusted between 80∼300 nm by changing the homogenization rate and amount of cosurfactant and surfactant. The monomer droplets prepared by miniemulsion method using a cosurfactant were homogeneous and stable compared with those prepared by conventional emulsion polymerization. This might be occurred due to the prevention of Ostwald ripening and coalescence between droplets by using hexadecane as a cosurfactant.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.39 no.9
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• pp.917-922
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• 2015

The goal of this study is to consider the application of alternative blended fuel to diesel engine. In this study, as the test fuels, we use a blended fuel mix of diesel and hydrogen peroxide. As the primary variable, we vary the mixing ratio of diesel and hydrogen peroxide in the experimental and numerical analysis. We perform an evaporative behavior characteristics analysis of the emulsified fuel using the Schlieren method. The numerical analysis was carried out based on results obtained from the experimental analysis using the commercial code(ANSYS CFX). Consequently, we found that the micro-explosion depends on the fraction of hydrogen peroxide, and we propose a numerical method for the quantitative evaporation analysis of emulsified fuel droplets using the calculation of the volume fraction in the oil domain.