• Title, Summary, Keyword: modifier

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City Slogan Modifiers and Slogan Attitudes from the Perspective of Outsiders' (도시 슬로건 수식어가 슬로건 태도에 미치는 영향 : 외부인 시각 관점의 접근)

  • Hwang, Insuk;Kim, Dohyung;Kim, Hwa-Kyung
    • Korean Management Science Review
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    • v.32 no.3
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    • pp.105-118
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    • 2015
  • This study examines the relationship between city slogan modifiers and slogan attitudes from the perspective of residents in other cities. To examine this relationship, the study focuses on two important characteristics of slogan modifiers : the preference for a slogan modifier and the fit of a slogan modifier. To test the hypotheses, a 2 (low vs. high city knowledge)${\times}2$ (low vs. high slogan modifier preference)${\times}2$ (low vs. high slogan modifier fit) between-subjects factorial design was adopted. A total of 254 undergraduate students at the authors' college participated in the study. Their ages ranged from 19 and 30 (average = 22.3), and 58.3% of the participants were male. According to the results, the high-preference slogan modifier had a greater positive effect on slogan attitudes than the low-preference one. Similarly, the high-fit slogan modifier had a greater positive effect on slogan attitudes than the low-fit one. Also, it was shown that the fit of the slogan modifier had a greater effect on purchase intentions than the preference for the slogan modifier when city knowledge was high. However, contrary to expectations, when city knowledge was low, the standardized coefficient of the preference for the slogan modifier was not significantly different from that of its fit.

Chaetoglobosin A, an Inhibitor of Bleb Formation on K562 Cells Induced by Phorbol 12, 13-Dibutyrate

  • Ko, Hack-Ryong;Kim , Bo-Yeon;Ahn , Soon-Cheol;Oh, Won-Keun;Kim, Jin-Hee;Lee, Hyun-Sun;Kim, Hwan-Mook;Han, Sang-Bae;Mheen, Tae-Ick;Ahn, Jong-Seog
    • Journal of Microbiology and Biotechnology
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    • v.8 no.6
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    • pp.705-709
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    • 1998
  • In the course of screening for the substances suppressing bleb formation of K562 cell induced by phorbol 12, 13-dibutyrate (PDBu), an inhibitor, chaetoglobosin A (CgA) was isolated from a cultured broth of unidentified fungus. CgA showed a strong inhibitory activity with the $IC_{50}$ value of 60 pM against bleb formation on K562 cells induced by PDBu, but it did not inhibit the activity of protein kinase C (PKC) in vitro. The inhibitory activity of CgA might be due to the modulation of actin filaments on the cell membrane. CgA exhibited strong cytotoxicity against various human cancer cell lines.

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Isolation of Anguillosporal, a Potent Inhibitor of Phospholipase C from Fungi Isolate No. 51005 (곰팡이 분리주 No. 51005로부터 포스포리파제 C 저해물질 앙길로스포랄의 분리)

  • Oh, Won-Keun;Lee, Hyun-Sun;Ahn, Soon-Cheol;Ko, Hack-Ryong;Kim, Bo-Yeon;Min, Tae-Ick;Ahn, Jong-Seog
    • YAKHAK HOEJI
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    • v.41 no.4
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    • pp.433-438
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    • 1997
  • MT 51005 as a potent inhibitor of phospholipase C(PLC) was purified from the culture broth of a fungal strain No. 51005 isolated from soil. It was identified as a benzaldehyde d erivative, anguillosporal. by the physico-chemical properties and spectroscopic data. Anguillosporal showed the inhibitory activity against purified PLC with an $IC_{50}\;of\;13{\mu}g/ml$. And it also inhibited the formation of inositol phosphates($IP_t$) in platelet-derived growth factor(PDGF)-stimulated $NIH3T3{\gamma}1$ cells with an $IC_{50}\;of\;0.8{\mu}g/ml$.

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New Device for Addition of Modifier to Supercritical Fluid Carbon Dioxide Mobile Phase

  • 표동진;김호현
    • Bulletin of the Korean Chemical Society
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    • v.18 no.6
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    • pp.584-588
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    • 1997
  • A new device to accurately deliver small amount of modifier into supercritical carbon dioxide fluid is described. Carbon dioxide, the most widely used mobile phase in supercritical fluid chromatography, is a relatively non-polar fluid, and hence the addition of small amount of polar modifiers could be necessary to migrate polar solutes. In this work, supercritical CO₂and modifier are delivered from the pump to a 100 μL mixing chamber in which a small magnetic bar is rotating. After passing through the mixing chamber, supercritical CO₂is changed to a new mobile phase with different polarity. The amount of modifier added into supercritical CO₂is measured by an amperometric microsensor, which is prepared from a thin film of perfluorosulfonate ionomer.

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Computer Simulation of Izod Impact Test for Impact Modifier Reinforced Nylon6 (충격보강제가 포함된 나일론 6에서 Izod 충격시험의 컴퓨터 모사)

  • Park, Yohan;Lyu, Min-Young;Paul, D.R.
    • Elastomers and Composites
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    • v.48 no.2
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    • pp.172-179
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    • 2013
  • Impact modifier reinforced polymers are frequently used. In this study, Izod impact test has been simulated to analyze the mechanism of impact reinforcement of Nylon6 which contains impact modifier. The modeling of rubber particles added to Nylon6 as an impact modifier has been attempted. Based on the modeling, simulation of Izod impact test has been performed to observe the distribution and direction of stress at the cross-section of impact specimen. Three computer simulation models for Nylon6 were investigated. Those were without impact modifier, containing impact modifier without surface treatment, and containing impact modifier with surface treatment in the Nylon6. Simulation results showed that the stress which originated at the notch surface propergated to the inside of specimen round a impact modifier. In addition to that, impact modifier reinforced Nylon6 specimen showed low stress ditribution in the cross-section specially at notch surface. Principal stress in perpendicular direction to crack was also lowered in impact modifier reinforced Nylon6. These enhanced impact resistance reduced and crack propergations. Through this study it was realized that the computer simulation can be utilized to investigate the property enhacement of composite materials.

TCR Adjustment of $ RuO_2$ Thick Film Resistor by Semiconducting Oxides (반도성 산화물에 의한 $ RuO_2$ 후막저항체의 TCR조정)

  • Lee, Byung-Soo;Lee, Joon
    • Korean Journal of Materials Research
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    • v.2 no.1
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    • pp.58-64
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    • 1992
  • TCR modifying oxides which have negative TCR were added to the $\textrm{RuO}_2$ thick film resistors and how they affect the TCR and resistivity of the systems were investigated. Two types of resistor systems whose ratio of $\textrm{RuO}_2$ to glass were 20/80 and 12/88 were used as standard resistors. It was observed that the modifiers did not always lower the TCR of the resistors and the direction of the TCR change were different from system to system. It was confirmed, however, that the feasibility of optimization of TCR of the resistors. When more than two TCR modifiers were added simultaneously there was no interaction between them. The resultant TCR of the resistor wart just sum of the effects from individual modifier. It was found to be desirable that the amount of addition of the TCR modifiers should be less than 2 to 3 percent.

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Inhibition of Nitric Oxide Production by Coumarins from Peucedanum japonicum in LPS-Activated RAW 264.7 cells (갯기름나물의 쿠마린에 의한 RAW 264.7 세포주의 Nitric Oxide 생성 저해활성)

  • Choi, Hee-Cheol;Rho, Tae-Cheol;Kim, Bo-Yeon;Ko, Hack-Ryong;Oh, Won-Keun;Seong, Chang-Keun;Mheen, Tae-Ick;Ahn, Jong-Seog;Lee, Hyun-Sun
    • Korean Journal of Pharmacognosy
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    • v.30 no.2
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    • pp.99-104
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    • 1999
  • During the screening for inhibitors of nitric oxide production in LPS-activated macrophage, RAW 264.7 cells. Five coumarins were isolated from chloroform extract of the root of Peucedanum japonicum. They were identified as praeruptorin A (1), xanthotoxin (2), psoralen (3), isopimpinellin (4), bergapten (5) on the basis of spectroscopic methods. The $IC_{50}$ values for nitrite production by activated macrophages were about $1.5\;{\mu}g/ml$ (1), $0.3\;{\mu}g/ml$ (2), $1.0\;{\mu}g/ml$ (3), $25\;{\mu}g/ml$ (4), $25\;{\mu}g/ml$ (5), respectively. However, the inducible nitric oxide synthase (iNOS) was not inhibited by treatment with these compounds. Their inhibitory effect on nitric oxide production was resulted from the supperssion of iNOS expression.

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An Experimental Study for the Effect of Friction Modifier Added in Fuel on the Engine Friction and Fuel Economy (연료 주입형 마찰 조정제가 엔진 마찰 및 연비에 미치는 영향에 대한 실험적 연구)

  • 조명래;강경필;오대윤;최재권
    • Tribology and Lubricants
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    • v.18 no.2
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    • pp.133-137
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    • 2002
  • This paper reports on the effect of fuel additive friction modifier on the engine friction and fuel consumption. The test of engine friction and fuel consumption is performed for the each oils and fuels. The TFA4724 friction modifier is added in test oil and fuel. The test results show that total engine friction is a decrease of 0.7-2.0% compared with base fuel, and fuel consumption is improved by 0.3%. The amount of friction reduction corresponds to that of boundary friction loss term in ring-pack friction losses. From the results, it is thought that the additive friction modifier in the fuel is effective to reduce the boundary friction in ring-pack.

Weathering and Termite Resistance of Woodflour-Recycled Polypropylene Composites in Tropical Region

  • Febrianto, Fauzi;Sulaeman, Rudianda;Karina, Myrtha;Ashaari, Zaidon;Hadi, Yusuf Sudo
    • Journal of the Korean Wood Science and Technology
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    • v.34 no.5
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    • pp.88-97
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    • 2006
  • Wood flour (WF)-recycled polypropylene (RPP) composites composed of 50% WF of Eucalyptus deglupta Blume species, 50% RPP, various contents of maleic anhydride (MAH) modifier (0; 1; 2; 5; 5; 7.5; and lo%), and 15% dicumyl peroxide (DCP) initiator (based on MAH weight) were subjected to weather for 1 year and subterranean termite (Coptotermes cuwignathus HOLMGREN) and dry wood termite (Cryptotermes cynocephalus LIGHT) for 3 and 4 weeks, respectively. WF-RPP composites with 2.5% MA modifier had tensile strength, breaking elongation and Young's modulus about 2.2, 2.3, and 1.2 times, respectively higher compared to MAH-free composites. The WF-RPP composites with or without MAH modifier had 5.5 times higher resistance to weather compared to RPP film alone. The color of the WF-RPP composites with or without MAH modifier became lighter after exposures to the weather. The WF-RPP composites with or without MAH modifier are resistant to subterranean termite Coptotermes curvignathus HOLMGREN and dry wood termite Cryptotermecs cynocephalus LIGHT under the experimental condition adopted.