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Reinforcement of Rubbers by Carbon Black Fillers Modified by Hydrocarbon Decomposition
김명수,Shuangye Dai,Geyou Ao 한국공업화학회 2007 Journal of Industrial and Engineering Chemistry Vol.13 No.7
Carbon blacks were used as catalysts for hydrogen production through hydrocarbon decomposition under different operation conditions such as temperature, residence time, and hydrocarbon precursor. Those modified carbon blacks were used as reinforcement fillers in both NBR and SBR rubbers. The specific surface area of carbon black increased with low weight gain in decomposition of methane and mixture gas of methane-propane caused by the protruded carbon deposits on the surface of carbon black aggregates but the decrease of specific surface area with further weight gain occurred probably due to the carbon deposits adhering to each other. At the same loading ratio, composites filled by carbon blacks with low weight gain in methane-propane mixture gas and methane decomposition reactions exhibit overall improved mechanical properties. Modulus at 300 % strain measured showed superior values for SBR rubber composites filled by carbon blacks after propane decompositions. The surface resistivity of composites reveals that more developed filler network of carbon blacks inside the rubber system could be obtained after decomposition of methane-propane mixture gas and methane with low weight gain.
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편측 구치부 교차교합을 동반한 과발산형 골격성 II급 성인의 비수술 치험례
김명수,이동렬,이언화 대한치과교정학회 2020 대한치과교정학회 임상저널 Vol.10 No.1
This case report is about a 23-year-old female with hyperdivergent skeletal Class II malocclusion and right posterior scissor bite. Orthodontic mini-implants and transpalatal arch were used to correct the scissor bite, and extraction of four premolars were done for non-surgical treatment. By applying constant torque to the stiff stainless-steel wire on retraction of the upper anterior teeth, the inclination of them was restored. Good occlusion and esthetic profile were obtained by total arch intrusion mechanics of the upper dentition to correct the hyperdivergent pattern and gummy smile.
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김명수,최흥섭 한국초등체육학회 2010 한국초등체육학회지 Vol.15 No.3
The purpose of this study is, concerning the introduction of the sports instructor system into elementary school, to look into its operating reality, and the to suggest an desirable operating way of the sports instructor system. The research was performed in two areas; First of all, the researcher conducted a questionnaire survey of 219 sports instructors to grasp the real condition regarding sports instructor system operation. Second, on the basis of the survey results on the responded questionnaires, the researcher, as a first step, selected 3 respondents(instructors) who were expected to give a concrete information, and then conducted twice interview with them. The results of study had shown that a temporary expedient method has been take; 91.8% instructors among them surveyed have been in charge of class in direct, and 41.1% ones have undertaken to coach school athletic club. Therefore, it's suggested that the sports instructor system should be continuously operated, for that, the persons(parties) concerned would have to make en effort to make a given circumstance in which they(instructors) feel pride in what they are doing.
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