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CuCl₂/SnCl₄를 이용한 Thiophene의 중합
맹기석,김수영 忠南大學校 産業技術硏究所 1988 산업기술연구논문집 Vol.3 No.1
Polymerization reactions were carried out at 80℃ for 10 hours with various molar ratios of CuCl₂to SnCl₄. The yield of conversion in the polymerization increased as the concentration of SnCl₄increases. A maximum of 5.8wt-% in the yield of conversion was obtained when polymerization was done with a molar ratio of ½of CuCl₂to SnCl₄. The polymeric structure of the polythiophene was deduced by analyzing and assigning the structure of oligomers formed in the reactions. Analyses show that the polythiophene contains a Cu ion per 3.6-4.3 of the thiophene ring.
Flux Cored Arc용접용 아크센서의 개발 및 이를 이용한 용접선 추적에 관한 연구
김수영,이승영,나석주 대한용접접합학회 1992 대한용접·접합학회지 Vol.10 No.4
Among the variety of welding processes available, the flux cored arc welding is one of the most frequently used process, because of its wide range of application and high productivity. The weld joint tracking is indispensable to improve the flexibility of the arc welding robot application for the flux cored arc welding (FCAW) process. In this study, an arc sensor which utilizes the electrical signal obtained from the welding arc itself was developed for weld joint tracking in FCAW. Because a model of the welding arc in flux cored arc welding was required to develop the arc sensor, a mathematical model was proposed by analysing the welding arc behaviour, and also an experimental model by using the factorial experiment and least square method. For overcoming the fluctuation in the welding current signal during tracking the weld joint, it was fitted to a curve which is inversely proportional to a trace of tip-to-workpiece distance by using the quadratic curve-fitting method.