• Journal of the Korea Convergence Society
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• v.12 no.1
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• pp.185-191
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• 2021

A powder metallurgy process with granules is the manufacturing technology that can achieve higher-density sintered parts than conventional powder metallurgy processes. However, there is a disadvantage in that the production cost increases significantly due to the additional granulation step. High granule productivity must be guaranteed for affordable material costs in this manufacturing technology. This paper performed a series of scattering, collision, and adhesion simulations of agglomerated powders to investigate the characteristics of granulation process affecting the manufacturing yield rate. The results of this simulation-based convergence study can contribute to improving productivity in the metal powder spray granulation process.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.21 no.3
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• pp.67-72
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• 2021

Association rule mining is a method of showing the relationship between patterns hidden in several tables. These days, granulation logic is used to add more detailed meaning to association rule mining. In addition, unlike the existing system that recommends using existing data, the granulation related rules can also recommend new subscribers or new products. Therefore, determining the qualitative size of the granulation of the association rule determines the performance of the recommendation system. In this paper, we propose a granulation method for subscribers and movie data using fuzzy logic and Shannon entropy concepts in order to understand the relationship to the movie evaluated by the viewers. The research is composed of two stages: 1) Identifying the size of granulation of data, which plays a decisive role in the implications of the association rules between viewers and movies; 2) Mining the association rules between viewers and movies using these granulations. We preprocessed Netflix's MovieLens data. The results of meanings of association rules and accuracy of recommendation are suggested with managerial implications in conclusion section.

• Journal of the Korean Society of Food Science and Nutrition
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• v.33 no.1
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• pp.225-228
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• 2004

Optimization of fluidized bed granulating conditions for yield, bulk density, and tapped density of powdered milk was determined using response surface methodology. Yield of powdered milk was greatly affected by feeding rate of water, and bulk density and tapped density could be reduced by decreasing of atomization pressure. The optimum conditions for fluidized bed granulating of powdered milk were predicted with 6$0^{\circ}C$ of inlet air temperature, 16 mL/min of feeding rate, and 2.1 bar of atomization pressure. Also 94% of yield 0.350 g/㎤ of bulk density, and 0.446 g/㎤ of tapped density of powdered milk could be obtained by the optimum granulating conditions.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2010.10a
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• pp.22-22
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• 2010

식생활의 변화, 공해 등의 환경변화 등으로 인하여 아토피 환자가 급격하게 증가하고 있다. 본 연구소에서는 자원식물로부터 아토피 치료제 개발을 위하여 면역세포의 탈과립화억제를 통하여 수종의 식물 자원을 탐색한 바 있다. 애기땅빈대, 여뀌, 고들빼기 등으로부터 유효성분 분리하여 산업화 단계에 있으며, 특히 본 연구에서는 한약자원인 지모로부터 분리된 성분에 대하여 보고하고자 한다. 지모는 현재 수많은 보고를 통하여 항암성분, 여성호르몬조절성분 등이 보고되고 있으며, 본 연구에서는 nyasol을 비롯하여 4개의 유도체를 분리하였다. 분리된 성분에 대한 면역세포 탈과립화억제 평가를 수행하였으며, 이들 성분이 함유되어 있는 MeOH추출물에서 systemic 및 passive anaphylaxis 억제 효과가 있음을 확인하였다. 특히, 이들 성분에 대한 유도체 합성을 진행하고 있으며, 이에 대하여 면역세포 탈과립화 억제를 통한 항아토피 및 항알러지에 대한 연구결과를 보고하고자 한다. 이들의 성분과 합성 유도체들은 항아토피에 활용될 수 있으며, 지모추출물자체로도 화장품, 식품, 의약품에 적용이 가능할 정도로 우수한 효능이 확인되었으며, 앞으로 이들 유도체에 대한 의약품 개발연구가 기대된다.

• Applied Chemistry for Engineering
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• v.22 no.2
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• pp.209-213
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• 2011

Hydrophobic silica aerogel beads with low thermal conductivity and high porosity were prepared using a cost-effective sodium silicate as a silica source via an ambient-pressure drying process. Monolithic wet gels were first prepared by adjusting pH (~5) of a diluted sodium silicate solution. The silica aerogel beads (0.5~20 mm) were manufactured by breaking the wet gel monoliths under a simultaneous solvent exchange/surface modification process and an ambient-pressure drying process without using co-precursors or templates. Dried silica aerogel beads exhibit a comparable porosity ($593m^2/g$ of surface area, 34.9 nm of pore size, and $4.4cm^3/g$ of pore volume) to that of the aerogel powder prepared in the same conditions. Thermal conductivity of the silica aerogel beads (19.8 mW/mK at $20^{\circ}C$) is also identical to the aerogel powder.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.42 no.5
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• pp.497-502
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• 1997

A seed pelleting technique was developed for easy handling of small sesame seeds (Chinbaeckkae) and for direct seeding in field. The mixture of pelleting material, binder(sodium alginate) and seeds were dropped in 100mM CaCl$_2$ solution. Charcoal was appeared as a best material among all to make pellets with the characters of hardness, breakdown, destruction rate and germination percentage. Zeolite formed the hardest pellet seeds among the materials and 1~3 seeds contained in a pellet on the treatment of 87g of sesame seeds mixed in 1$\ell$ CaCl$_2$ solution was estimated optimum rate of seed mixure with few appearance of seedless pellet. The moisture absorption rate was greater in the order of peat＋charcoal > peat > charcoal > zeolite. Germination percentage of pelleted seeds with charcoal was the best and similar to that of common non-treated seeds. Germination percentage of pelleted seeds by sowing depth of exposing a quarter of pellet seeds on the surface of vermiculite germination test box and were 92％ in charcoal treatment and was the best among all released materials.

• Proceedings of the Korean Society of Crop Science Conference
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• 1997.10a
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• pp.78-79
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• 1997

• Journal of the Korean Society of Food Science and Nutrition
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• v.41 no.5
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• pp.700-705
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• 2012

$Prunus$ $mume$ was steamed for easier removal of the pulp. The steamed fruit pulp was vacuum dried and powdered. The steamed $Prunus$ $mume$ powder (SPP) was passed through a 250 ${\mu}m$ sieve, fluidized in a fluid-bed granulator, and then granulated by top-spraying with water (SPPGW) or the extract obtained from steam (SPPGE). Then the physicochemical and sensory properties of SPP, SPPGW, and SPPGE were evaluated. The flowability of powder (angle of repose $^{\circ}$) of SPP, SPPGW and SPPGE was $23.59^{\circ}$, $11.07^{\circ}$, and $13.94^{\circ}$, respectively. The water dispersibility of SPP, SPPGW, and SPPGE was 18.69, 10.04 and 6.00 sec, respectively. Also, the overall acceptance of SPP, SPPGW and SPPGE was 3.00, 3.44 and 6.56, respectively. In conclusion, SPPGE can be used as granular steamed whole fruit pulp with good powder flowability and dispersibility, and therefore consumer acceptance.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.5 no.4
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• pp.297-308
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• 2007

The granulation equipment of concentrated wastes is manufactured for the polymer solidification of concentrated wastes. It uses liquid sodium silicate as a granulating agent for the granulating of dried powder containing boric acid. The granulating agent is sprayed in the form of droplet and mean size of dried granules is $2{\sim}4mm$. The new technology which has been used for the polymer solidification of spent resin in U.S. and certified by Nuclear Regulatory Commission (NRC) is successfully applied to concentrated wastes. This uses in-situ solidification process within drum without mechanical mixing. Maximum loading of waste can be achieved without increasing of waste volume. Polymer waste forms were evaluated with several test such as fire test, compressive strength test, leaching test, immersion test, irradiation test, and thermal cycling test according to standard test procedures.

• The Korean Journal of Malacology
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• v.13 no.2
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• pp.161-173
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• 1997

동양달팽이의 위 상피에서 섬유소 분해효소의 분비여부를 화확인하기 위해 세포화학적 방법과 immunogold labeoling mithod를 수행되었다. Nesiohelix samarangae의 위에선 3가지 종류의 원주상피가 관찰되었다. 이 중 TYpe1세포는 microvilli가 발달하고 매우 많은 분비과립을 함유하고 있었으며, Type2세포는 위로 치우친 핵과 전자밀도가 높은 세포질에 rER이 매우 발달해 있었다. Type3 세포는 섬모와 미세융모를 함께 가지고 있는 세포로서 분비과립을 약간 함유하는 것으로 관찰되었다. 세포화학적 방법으로 위 상피에서의 cellulase의 활성을 시험해본 결과 상피세포들의 대다수를 차지하는 Type 1세포들과 Type3 세포들의 분비과립들의 주변에서 cellulase활성이 높았고, immunogold staining결과는 황금입자가 위 상피의 분비과립 주위의 세포질과 rER의 막과 주변세포질, 그리고 상피세포들의 상단부 세포질 등에서 표지되었다. 이상의 모든 실험 결과는 동양달팽이의 위 상피세포에서 cellulase가 분비된다는 사실을 알았다.