• Journal of Sasang Constitutional Medicine
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• v.15 no.3
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• pp.216-220
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• 2003

We treated a Taiyangin(太陽人) patient with Yulkyuk(?膈) disease. He was diagnosed as acute cerebellar infarction, hypertension and trigeminal neuralgia(rule out). His chief complaint was nausea, dysphagia, trigeminal neuralgia, anorexia, and numbness of upper and lower extremity. He was orally administrated with Mihudeung Sikjang Tan(??藤植腸湯) additions. Mihudeung Sikjang Tang(??藤植腸湯) additions was Fructus Chaenomelis(木瓜), Grape root(葡萄根), Buckwheat(蕎麥), Semen pruni(櫻桃肉) etc. His chief complaint was improved by oral administration of Mihudeung Sikjang Tan(??藤植腸湯) additions, and we do report this clinical case study.

• Elastomers and Composites
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• v.48 no.4
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• pp.276-281
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• 2013

Polyester type polyurethane foam modified with acrylic polyol was prepared by quasi prepolymer method. Thermal and dynamic mechanical properties of polyurethane foam were analysed by thermal gravimetric analysis(TGA) and dynamic mechanical analysis(DMA). Also, glass transition temperature was measured by differential scanning calorimeter(DSC). As acrylic polyol contents were increased, thermal stability measured by TGA was slightly decreased. Storage modulus was increased and tan delta was decreased with increasing of acrylic polyol contents.

• Elastomers and Composites
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• v.51 no.3
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• pp.218-225
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• 2016

In order to examine correlation between silane coupling agent and activator which affects the physical properties of silica filled natural rubber compound, such as heat buildup, rebound property, dynamic mechanical and morphological properties were measured. With incorporation of silane coupling agent, $tan{\delta}$ at $0^{\circ}C$ was increased and at $60^{\circ}C$ was decreased, which resulted in improving of wet grip and rolling resistance. When silane coupling agent which is corresponding to 8~10% of silica was used, most favorable heat build up and $tan{\delta}$ was obtained. And also when activator was used, dispersibility of silica was improved as a result of reduction of reaggregation of silica.

• Tribology and Lubricants
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• v.10 no.4
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• pp.59-68
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• 1994

This study is concerned with the change of physical and chemical properties of the used oil in gasoline and LPG engine. The used oils of engine were sampled from dynamometer and cars. The field tests of car were done in city and on highway. The properties of oil were TAN, TBN, visocity, oxidation, ZDTP depletion factor and etc. Also the relation between the chemical change and antiwear property was studied. From the study, it was shown that the decrease of antiwear property of used oil was depended on the changes of ZDTP depletion factor as well as TAN (total acid number). Also, it was found that the oil used by LPG car was deteriorated within the shortest distance among the other gasoline cars. The antiwear property of oil decreased as the running distance increased. The gasoline engine oil drove mainly on highway was the least deteriorate of properities for the same running distance.

• Proceedings of the KIEE Conference
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• 1995.11a
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• pp.382-385
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• 1995

Electrical properties such as tracking resistance, dielectric constant, $tan\delta$, and volume resistivity, and mechanical properties such as tensile, and strength, and % elongation were measured with the alumina trihydrate filled with EPDM. The results were dicussed in terms of the effect of hydroxyl group. The test results show that the tracking resistance of EPDM improves with the increase in ATH content, whereas volume resistivity, dielectric constant, $tan\delta$ decrease wi th increasing ATH content due to polar nature of ATH. In the charge accumulation characteristics, the homocharge is formed in pure EPDM, and as the ATH content increases in the EPDM compound, the amount of homocharge decrease.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.11 no.4
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• pp.111-117
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• 2012

Dust collecting performance of axial-vane type cyclone for oil mist was analyzed in this study. For predicting cut diameter size of cyclone, the number and angle of vane ($tan{{\beta}_2}^{\prime}$) was simulated by CFD. As the result, $tan{{\beta}_2}^{\prime}$ was decreased as the number of vane was increased and the angle of inclination(${{\beta}_2}^{\prime}$) decreased, and it cause strong swirl flow. Therefore, it could be confirmed that as the number of vane was increased and the angle of inclination was decreased, cut diameter size was decreased. Also, by verifying the results of CFD through experiment, the cut diameter size could be $2{\mu}m$ at $4m^3/min$ of flow rate.

• 한국생물공학회:학술대회논문집
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• 2002.04a
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• pp.343-345
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• 2002

This study was performed by the airlift bioreactor using the nitrifier consortium entrapped in polyvinyl alcohol(PVA) for removing low concentration total ammonia nitrogen(TAN). At the aeration rate of 1.5 vvm, TAN removal rate and removal efficiency was 316.6${\pm}$7.2 $g/m^3$ day and 92.8${\pm}$2.2%. Removal rate was continuously increased with decreasing from 0.5hr to 0.05hr of hydraulic residence time(HRT), whereas removal efficiency was decreased with decreasing HRT.

• 한국생물공학회:학술대회논문집
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• 2002.04a
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• pp.346-348
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• 2002

This study estimated the effect of influent TAN concentration. temperature and pH in the airlift bioreactor(aeration rate; 1.5 vvm, HRT 0.35hr) using immobilized nitrifiers by PVA. At the effect of influent TAN concentration, removal rate was increased with increasing it and removal efficiency maintained 93${\pm}$2%. The optimum temperature for nitrification was $30^{\circ}C$ and at this point. removal efficiency was 95.5${\pm}$1.5%. It was effective to nitrify at $10^{\circ}C$ of low temperature. In the pH range from 7 to 9 in the bioreactor. removal rate and removal efficiency was 310${\pm}$10 $g/m^3$ day and 94${\pm}$3%.

• KIEE International Transactions on Electrophysics and Applications
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• v.2C no.6
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• pp.321-326
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• 2002

This paper describes the mechanical and electrical characteristics of insulating paper impregnated with diluted varnish(W-128), according to Korean Standards. The varnish was diluted with a solvent of 6 different wt%. Kraft paper and Nomex paper were impregnated with the diluted varnish in a vacuum condition, and then completely dried. As the mechanical characteristics, the thickness of the completely dried varnish, the drying time and the tensile strength of the specimens were measured, and as the electrical characteristics, the permittivity, the tan $\delta$ and the specific resistance were evaluated as well.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1994.11a
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• pp.147-151
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• 1994

In order to investigate the dielectric characteristic insulating oil is chosen insulating oil for electric cable, and experiment is performed in the temperature range of 30∼120[$^{\circ}C$] and frequency range of 30∼1${\times}$10$\^$6/[㎐]. As a result, the observed linear decrease in tan $\delta$ value at the low frequency range is due to the influence of frequency, whereas the increase in tan $\delta$ value at high frequency range is contributed by the electrode's resistance and dielectric loss. The dipole moment and activation energy of specimen are obtained 1.22(debye) and 12.75∼18.66[㎉/㏖e] of high temperature region, 15.68 ∼ 20.6[㎉/㏖e] of low temperature region respectively.