• Korean journal of food and cookery science
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• v.13 no.4
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• pp.492-499
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• 1997

The effect of oxidants, gluten and gums on breadmaking quality of wheat-purple sweet potato(Ipomoea batatas) composite flour were studied. Alveograph tests of doughs showed that all additives increased the P, L and W values. Of these additives, L-Ascorbic acid, gluten, carboxy methyl cellulose have a significant effect on alveogram indexes. SEM showed that the dough added with additives changed some what in appearance when compared with the control. When oxidants was added, the doughs discontinuous gluten film were observed. No significant differences ,were evident in bread crumb color among the additives. And textural characteristics of bread crumb were influened by adding additives. Breads containing additives showed an increase in max weight, strength and hardness and a decrease in springness and cohesiveness. Average enthalpy values for all bread crumb after 7days increased with storage time. However, addition of additives decrease the rate of staling slightly more than that of the control. Addition of L-Ascorbic acid, L-Cystine, carboxy methyl cellulose and hydroxy propyl methyl cellulose increased the loaf volume significantly, and with except potassium bromate bread scores were acceptable.

• Journal of the Korean Society of Safety
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• v.19 no.3 s.67
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• pp.65-69
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• 2004

This study was performed with Hartmann type dust explosion apparatus and Godbert-Greenwald furnace apparatus in order to research the effect of temperature and humidity affecting LEL, minimum ignition temperature of Hydroxy Propyl Methyl Cellulose. The experimental determinations in the range between $20^{\circ}C\;and\;60^{\circ}C$ of temperature was not affected $LEL(180g/m^3)$ but LEL showed $200g/m^3\;and\;250g/m^3\;at\;80^{|circ}C\;and\;100^{\circ}C$. As the change of humidity LEL was $180g/m^3\;for\;50\%,\;200g/m^3\;for\;60\%\;and\;250g/m^3\;for\;70\%$ but dust explosion didn't occur over $80\%$. The ignition temperature of HPMC dust clouds was increased as increasing of humidity. So, the minimum ignition temperatures at $50\%,\;60\%,\;70\%\;80\%$ of humidity was $363^{\circ}C,\;375^{\circ}C,\;397^{\circ}C,\;405^{\circ}C$.

• Journal of the Korean Society of Safety
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• v.19 no.1
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• pp.137-140
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• 2004

The minimum ignition temperature at which the dust cloud can spontaneously ignite is considered to be very important in industries to prevent explosion occurring in hot surfaces. This paper has dealt with the experimental study of the determination of minimum ignition temperature of Hydroxy Propyl Methyl Cellulose (HPMC) dust cloud. We have used the Godbert-Greenwald Furnace Apparatus to determine the ignition temperature and limiting oxyten concentration for dust could. The experimental determinations on the minimum ignition temperature were carried out with various particle size with nominal diameters 45, 75 and 106${\mu}m$. The limiting oxygen concentration of dust cloud was determinated for the smaller size(45${\mu}m$) HPMC. Minimum ignition temperature of dust cloud was at 364$^{\circ}C$ for the concentration of 2.5g/L in the air and became higher with the increasing of nitrogen concentration. It was also found that the ignition didn't occur when the oxygen concentration was below 10%, and limiting oxygen concentration is at 11%.

• Fire Science and Engineering
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• v.15 no.4
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• pp.34-40
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• 2001

The spontaneous ignition of hydroxypropyl methyl cellulose(HPMC) was investigated at constant ambient temperature in the oven and minimum ignition temperature of dust clouds with Godbret-Creenwald Furnace respectively, In the experiments of the vessel filled with sample. the larger the vessel was the lower the spontaneous ignition temperature and ambient temperature was calculated from the Frank-Kamenetskii thermal ignition theory. The minimum ignition temperature for the dust cloud state was found under 21% oxygen concentration. At the experiment with the change of oxygen concentration, HPMC was not ignite at 10% $O_2$and so the limiting oxygen concentration was obtained at 10%.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2004.10a
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• pp.72-77
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• 2004

• Proceedings of the Korea Concrete Institute Conference
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• 2003.11a
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• pp.497-500
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• 2003

The propose of this study is to discover the extrusion lightweight concrete panel mixing by admixture. The standard of water ratio 50% and weight substitution 0%, 10% by Fly-ash. When the products are manufactured, it is used to maintain its form weight substitution and addition among the viscosity agent each Silica-fume and Hydroxy propyl methyl cellulose. The study is basic properties and performances of extrusion lightweight concrete panels. Testing methods was specific gravity, water absorption, resistance to impact, thermal conductivity, and sound insulation.

• Proceedings of the Korea Concrete Institute Conference
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• 1995.10a
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• pp.41-44
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• 1995

The purpose of this study is analyze to the properties of high fluidity concrete(W/C 35~50%) with the dosage of viscosity agent(Hydroxy Propyl Methyl Cellulose ; HPMC ; 15U), From the resuls, flowability was good about 200g/㎥. segregation-resisibility and placeability were good upward 300g/㎥, To synthetic, the dosage of viscosity agent are discovered best in 200~400g/㎥

• Proceedings of the KIEE Conference
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• 2004.07d
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• pp.2696-2698
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• 2004

Iontophoresis를 이용한 경피전달용 약물 패치를 제작하기 위해 고분자의 종류, 전류크기, 시간에 따른 약물방출 결과를 발표한다. 고분자 Hydroxy Propyl Methyl Cellulose(HPMC), Hydroxy Propyl Cellulose(HPC), Hydroxy Ethyl Cellulose(HEC)에 각각 국소마취제-Lidocaine을 넣어 시료를 제작하였다. 약물 방출은 Drug Delivery Cell(DDC)위에 Ag/AgCl 전극 (anode), Pt wire 전극(cathode)을 각각 설치하여 전압인가에 따른 이온 유동으로부터 시간에 따른 전압/전류변화 및 약물농도를 고찰하였다. 전압 15V 인가 시 고분자 막과 전해질 사이에 흐르는 전류 1.0mA는 15분간 유지되지만, Ag/AgCl 전극의 산화작용으로 인해 전류는 서서히 감소하며 26분 후 거의 흐르지 않았다. 따라서 안정적인 전류로 유지되는 시간을 15분으로 최적화하였다. 고분자 중 HPMC 막을 사용하여 약물방출 실험을 한 경우 UV 분석결과 파장 262.26nm에서 최대 흡광도 0.238이었고, 가장 높은 약물농도가 나타났다. 이러한 HPMC의 약물방출 실험결과 비교적 높은 전류 1.0mA일 때 약물 방출량이 많았고, 동일한 전류 0.4mA를 장시간 흐르게 하였을 경우, 농도가 축적되므로 치료 가능한 안정적인 특성임을 확인하였다.

• Magazine of the Korea Concrete Institute
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• v.6 no.6
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• pp.151-158
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• 1994

In this work, in order to inrprove the flexural strength of hardened portlarid cerncrit paste, mix ing water was reduced to water ccrnent ratio of 0.1 aid water soluble polymer such as hydroxy propyl methyl cellulose was adclelri to the paste to obtain a better dispersion. The paste was kneaded by the twin roll mill for cornpact and homogeneous mixing. The high strength mechanism of the hardened cement paste may be due to the removal of macropores larger than 100${\mu}m$, the reduction of capillary pores acting as the passage of crack propagation, the increase of Young's moculus with iticrease of unhytlratcci cenxxnt ard the incicasc of fracture toughnevs with the crack toughening mechanism (grain bridging, polymer fibril bridging and fritional inter-locking).

• Journal of The Korean Society of Grassland and Forage Science
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• v.24 no.2
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• pp.155-162
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• 2004

Different adhesives(CF-clear, arabic gum, cethylmethyl cellulose, polyvinyl alcohol, polyvinyl pyrrolidone, hydroxy propyl cellulose, methyl cellulose) and particulate matters(bentonite, kaolin, calcium carbonate, peatmoss, talcum, vermiculite, zeolite, calcium hydroxide, plaster, calcium phosphate, vermiculite + calcium carbonate, vermiculite + kaolin, vermiculite + talcum) were evaluated by coating index method. According to the weight of single coated seeds, CF-clear and polyvinyl alcohol appeared to be the best coating adhesives for red clover and tall fescue seeds. Both vermiculite and vermiculite + talc(l : 1) for red clover, and vermiculite + talc(l : 1) for tall fescue appeared to be the best particulate matter(P < 0.01). Percent friability showed excellent results for the arabic gum, CF-clear, and polyvinyl alcohol when compared to others(p < 0.01). The coating index showed high with vermiculite and vermiculite + talc(l : 1) in coating red clover seed, and talc, vermiculite, and vermiculite + talc showed good coating index in coating tall fescue seed.