• Journal of the Korean Society of Food Science and Nutrition
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• v.34 no.5
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• pp.700-706
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• 2005

The objectives of this research were to analyze physicochemical properties of physically modified rice starch which was prepared by hydro-shear homogenizer and ultrasonic homogenizer. The 5:1 of water to starch ratio, 20,500 rpm of hydro-shear homogenizer, and 5 sec of pulse and 40 kHz of frequency of ultrasonic homogenizer, which were operated for 10 min. The 1/3 of size reduction of raw rice starch and gelatinized rice starch, and reduced of particle size were achieved by above processing conditions. The homogenization of raw rice starch and gelatinized rice starch were higher values of specific area, transmittance, solubility and swelling power than control. While, these had lower value of apparent viscosity than control. In raw rice starch, the gelatinization characteristics of ultrasonic homogenizer treated rice starch had some higher values of gelatinization temperature, peak temperature and enthalpy than those of control. While, those of hydro-shear homogenizer treated rice starch had similar values to those of control.

• Journal of the Korean Society of Marine Environment & Safety
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• v.18 no.6
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• pp.584-590
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• 2012

In this study, we have conducted a work on homogenizer development which is operated by high shearing force generated by stator and rotor inside it. To investigate the performance for homogenization and atomization of homogenizer, Bunker-C (IFO 380 cSt) was used as a fuel for experiment. Pre-treatment of bunker-C was carried out with homogenizer developed in this study. Oil purifier was used to investigate effect of oil sludge reduction after pre-treatment. Experimental result showed that the amount of sludge of fuel oil after pre-treatment with homogenizer has decreased by 13 %. To confirm combustion efficiency, Bunker-C which have pre-treatment with homogenizer and purified after are burned in boiler system. The result showed that CO concentration in exhaust gas was decreased. These results mean that if the homogenizer which is developed in this study for marine fuel oil is applied on real vessels, oil costs and operating costs can be reduced.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2010.06a
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• pp.82-82
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• 2010

에폭시메트릭스 내에서 초음파 및 균질기를 이용하여 층상실리케이트 마이크로 입자의 균질분산을 위하여 사용하였다. 초음파와 균질기를 동시에 사용하여 최적의 적용시간과 충진나노입자 충진함량과의 관계를 연구하기위하여 구조적 특성으로 X-RD, 열적특성으로 DSC, 열적 기계적 특성으로 DMA를 사용하여 특성을 평가하였다. 충진함량 변화에 대해서 층상실리케이트의 층간사이 간격의 변화는 반비례하는 특성을 나타내었고, 충진함량이 증가됨에따라 자체만으로는 크게 응집된 입자의 분산이 미약한 결과로 볼 수 있다. 그러나 Homogenizer와 동시에 분산할 때는 충진함량이 크게 증가하여도 균질한 분산이 이루어졌다.

• Journal of the Korean Society of Food Science and Nutrition
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• v.35 no.10
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• pp.1434-1438
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• 2006

The purpose of this study was to make soy milk without using any food additives. First, it was attempted to find the effects of homogenizing pressure on the emulsion stability of soy milk without addition of monoglyceride. The soy milk was made with the ratio of bean and water as 1:8, and the yields of soy milk was measured to be 5.87 fold of the beans used. lifter making soy milk by differentiated pressure of the homogenizer at $50kg/cm^2,\;100kg/cm^2,\;150kg/cm^2\;and\;200kg/cm^2$, general composition of the center part of soy milk was analysed. The analysis results indicated that the lipid content increased by the increase of the emulsion pressure. Moreover, the suspension stability, emulsion stability and viscosity also increased by the increase of the emulsion pressure. Therefore, we thought that the production of soy milk without adding any emulsifier was possible only by homogenizing at higher pressure over $150kg/cm^2$.

• Korean Chemical Engineering Research
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• v.58 no.4
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• pp.530-535
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• 2020

A ceramide-containing nanoemulsion was synthesized by using a High-Pressure Homogenizer (HPH) to observe its changes in properties and long-term stability. The droplet size, droplet distribution and zeta potential of nanoemulsion were examined by varying the pressure and the number of passes of the HPH. The increase in HPH pressure and number of passes decreased the average droplet size and made the nanoemulsion more uniform. However, beyond certain operating condition, the recombination between the droplets was confirmed due to droplet surface energy and emulsifier. This study also shows that the decrease in droplet size increased the nanoemulsion viscosity although only minimal changes occurred in the zeta potential. The formed nanoemulsion was then tested for its stability by storing it at 25 and 45 ℃ for 28 days. During the first week, the average droplet size increased due to recombination and then subsequently remained constant. We confirmed that ceramide nanoemulsion for industrial application could be synthesized by using HPH.

• Journal of the Korean Magnetics Society
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• v.8 no.2
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• pp.86-92
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• 1998

Homegeneous feedstock is necessary to make plastic magents with uniform magnetic properties, therefore the optrimized mixing route and the homogeneity evaluation method are demanded. In this paper, method of homogeneity evaluation and effect of homogeneity on the magnetic prperites were investigated using Sr-ferrite /EVA plastic magnets. The feedstocks with different homogeneity were prepared using batch mixer and single screw extruder. The homogeneities of feedstocks were tested by torgue sensor, capilary rheometer, and measurement of magnetic properties. Mixing torque measurement using torque sensor was an effective method to determine the critical powder loading, but it was nor suitable to suitable to determine the feedstock mixing quality. Particle alignment measurement of a plastic magent was very accurate to evaluate the homogeneity, but expensive equipments were required to make and measure the samples. Pressure measurement using capillary rheometer was a very effective and easy method with high accuracy. Homogeneous feedstock increased the particle alignment of plastic magnet. Remanet flux density and maximum energy product increased linearly and quadratically with increasing particle alignment, respectively.

• Journal of the Korean Magnetics Society
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• v.26 no.6
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• pp.190-195
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• 2016

We report the effect of pressure varying from 0 to 1500 bar on the magnetic properties of magnetite nanoparticles synthesized from $Fe(OH)_2$ suspension using a high pressure homogenizer without any dispersing agent and oxidant. The observed X-ray diffraction (XRD) patterns showed that all the synthesized nanoparticles had the inverse spinel structure of magnetite. It was found from transmission electron microscopy (TEM) and XRD analysis that the average size of the synthesized magnetite particles could be controlled by the pressure of the high pressure homogenizer. The average particle size was found to range from 21 to 26 nm and decrease with increasing pressure. Magnetic hysteresis measurements performed at room temperature using a vibrating sample magnetometer (VSM) revealed the appearance of a superparamagnetic behavior in the magnetite nanoparticles synthesized at a pressure of 1500 bar.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.17 no.7
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• pp.719-729
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• 1992

An improved MXTM (maximum trimmed mean) -CFAR (constant false alarm rate) processor is proposed to reduce false alarm rates In detecting radar targets and Its performance character is ticsare analyzed to be compared with those of other CFAR processors. The proposed MXTM-CFAR processor is obtained by combining the GO (greatest of ) -CFAR processor reducing excessive falsealarm rate at riutter edges with the TM-CFAR processor showing good performances In homo-geneous Jnonhornog eneous background. Performance analyses have been done by computing detection probability, constant false alarm rate and detection thresholds under the homogeneous or multiple target environments and at the clutter edges. Analysis results how that the proposed CFAR processor maintains its performance as good as those of,05(order statistics) and TM-CFAR inhomogeneous and multiple target environments and Can reduce the false alarm rate at clutter edges. Overall computing time hfs been also reduced.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.7C
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• pp.725-734
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• 2006

As a sequel to Part 1, the performance characteristics of the cell averaging (CA), greatest of (GO), and smallest of (SO) constant false alarm rate (CFAR) processors in nonhomogeneous environment are obtained and compared when receiving antenna diversity is employed in the pseudonoise (PN) code acquisition of direct-sequence code division multiple access (DS/CDMA) systems. Unlike in homogeneous environment, the GO CFAR processor is observed to exhibit the best performance in nonhomogeneous environment, with the CA CFAR processor performing the second best.

• Proceedings of the Korean Nuclear Society Conference
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• 1995.10a
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• pp.73-78
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• 1995

이중 또는 삼중으로 탄소 피막된 핵연료 입자를 Graphite 소결체에 채워넣은 핵연료를 설계하고, 이에 대한 핵적 타당성을 검토하고자 하였다. 핵계산 체계로서 CASMO-3가 갖는 Spatial Self-shielding 효과의 문제, 코드의 계산 방식 문제, 핵자료 결손 문제를 검토한 후 보정 계수를 산출하려 하였다. CASMO-3의 정확도는 MCNP-4A를 통해 검증하였는데, 비균질한 소결체 내부를 균질화 함으로서 야기되는 Spatial Self-Shielding 효과는 임계도의 차이가 거의 없는 것으로 확인되어졌고, 계산 코드의 차이로 인한 효과 또한 무시할 수 있었다. 그러나 CASMO-3의 핵자료에서 탄소와 실리콘의 자료 부족은 임계도 차이가 0.06184정도로 다소 차이가 나기 때문에 보정이 필요함을 확인하였으나 CASMO-3 자체의 유용성에는 문제가 없었다.