• Analytical Science and Technology
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• v.22 no.5
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• pp.355-359
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• 2009

An enzyme electrode bound by rubber solution was newly constructed and the test of its practicability were carried out. The binder of carbon powder was styrene-butadiene rubber dissolved in toluene and enzyme source was ground tissue of cabbage root. Volatilization of the solvent made the electrode material possess a mechanical robustness and a fast signal appearance. The electrode showed electrochemically irreversible characteristics and a powerful catalytic power (detection limit=$5.0{\times}10^{-5}M$, S/N=2). The double reciprocal plot of signal current and substrate concentration was ideally linear and the symmetry factor and exchange current density of the electrode used in this work were 0.35 and $4.93{\times}10^{-5}Acm^{-2}$ respectively.

• Journal of Photoscience
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• v.6 no.1
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• pp.25-27
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• 1999

• Proceedings of the Korean Vacuum Society Conference
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• 2007.02a
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• pp.72-72
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• 2007

• The tire
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• s.16
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• pp.21-27
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• 1968

SBR의 가공기술은 이미 널리 보급되어 있으므로 본고에서는 미국에서의 SBR개발과정을 중점적으로 다루고 사용기술 및 용도에 대해서는 기본적인 요점만 해설키로 한다. SBR의 용도별 전문적인 가공기술은 후일 별도로 논술키로 한다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2004.11a
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• pp.57-63
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• 2004

• Proceedings of the Korean Fiber Society Conference
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• 1991.06b
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• pp.96-96
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• 1991

• Proceedings of the Korean Vacuum Society Conference
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• 2004.02a
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• pp.48-48
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• 2004

• Elastomers and Composites
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• v.35 no.1
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• pp.63-70
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• 2000

Zinc plated steel tire cords were subjected to RF plasma etching of argon, followed by plasma polymerization coating of acetylene or butadiene in order to enhance adhesion to rubber compounds. Plasma polymerization was carried out under optimized conditions of 10 W, 30 sec, 30 mTorr for acetylene and butadiene gas, while plasma etching was performed at 90W, 10min and 30mTorr. The adhesion of tire cords was evaluated via Tire Cords Adhesion Test (TCAT) and the failure surfaces of the tested samples were analyzed by SEM. Polymer coating by plasma polymerization was also characterized by FT-IR, Alpha-Step and dynamic contact angle analyzer in order to elucidate the adhesion mechanism.

• Analytical Science and Technology
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• v.28 no.6
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• pp.446-452
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• 2015

In order to evaluate and improve the ability of Korean testing laboratories to measure Polybrominated diphenyl ethers in acrylonitrile-butadiene-styrene (ABS), a proficiency test was organised by Korea Research Institute of Standards and Science (KRISS) based on ISO/IEC 17043. The proficiency test material used was 10 g of a granular ABS fortified with a mixture of congeners of PBDE (BDE-154, 183, 206, 209). Homogeneity and stability were investigated to assess the adequacy of the test material. The certified value established by KRISS based on the national reference was used for assigned value of each PBDE. The test materials were distributed to the 16 participating laboratories. The participating laboratories were requested to analyse the samples employing the methods used in their routine analysis. Each laboratory was given it’s own code to secure the anonymity. Participants results were evaluated with z-scores according to ISO/IEC 17043. The standard deviation for proficiency assessment was set by standard deviation of the participants results except for outlier. The results, the laboratory's performance and improvement of accuracy were discussed.

• Proceedings of the Korean Environmental Health Society Conference
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• 2004.06a
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• pp.73-86
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• 2004

The purpose of this study is the identification of (N-2-hydroxy-3-butenyl) valine(HBVal adduct) and (N-2,3,4-trihydroxy-butyl)valine(THBVal adduct)with mice inhalation exposure with 1,3-butadiene for 3 weeks($6\;hr/day\;{\times}\;5\;days/week$). Body weights were significantly lower from 4 or 9 exposure post-day in 1000 or 500ppm inhalation group than in control. The levels of HBVal adducts are 1.8, 3.7 and 6.2 pmol/mg globin in $1^{st}$, $2^{nd}$ , and $3^{rd}$ week for 500 ppm 1,3-butadiene(BD), and 5.7, 7.4 and 16.0 pmol/mg globin in $1^{st}$, $2^{nd}$ , and $3^{rd}$ week for 1000 ppm BD inhalation exposure. The levels of THBVal adducts are 32.0, 42.0 and 55.0 pmol/mg globin in $1^{st}$, $2^{nd}$ , and $3^{rd}$ week for 500 ppm BD, and 67.8, 72.7 and 83.5 pmol/mg globin in $1^{st}$, $2^{nd}$ , and $3^{rd}$ week for 1000 ppm BD inhalation exposure. Their ratios of THBVal and HBVal adducts are higher at earlier exposure and lower concentration. They are17.8, 11.4 and 8.87 in $1^{st}$, $2^{nd}$ , and $3^{rd}$ week for 500 ppm BD, and 11.9, 9.8 and 5.2 in $1^{st}$, $2^{nd}$ , and $3^{rd}$ week for 1000 ppm BD inhalation exposure. In conclusion, THBVal and HBVal adducts are a important hemoglobin adduct for monitoring of BD exposure, and the latter is more biomarker than the other.