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김승렬,운동현,홍형기,권철한,이규정 ( Seung Ryeol Kim,Dong Hyun Yun,Hyung Ki Hong,Chul Han Kwon,Kyu Chung Lee ) 한국센서학회 1997 센서학회지 Vol.6 No.6
The thick films of oxide semiconductors such as WO₃, SnO₂ and ZnO for the NO₂ detection of sub-ppm range have been prepared and their characteristics were investigated. It is showed that the optimum operating temperatures of the sensors are 300℃ and 220∼260℃ for WO₃-based and SnO₂-based thick films, and ZnO-based thick films, respectively. Since the resistance of ZnO-based thick films are extremely high($gt;l0^6Ω), the signal to noise ratio was comparatively low. In order to determine the selectivity, the films are exposed to the interfering gases such as ozone, ammonia, methane and the mixture of carbon monoxide and propane. WO₃-ZnO(3 wt.%) and SnO₂-WO₃(3 wt.%) thick film sensors show high sensitivity, good selectivity, excellent reproducibility and the linearity of NO₂ concentration versus sensor resistance. The preliminary results clearly demonstrated that the sensor can be successfully applied for the detection of NO₂ in sub-ppm range.
서양사 속의 평화 ; 유럽 국제평화의 기획 -세력균형, 국제연맹, 유럽통합의 비교-
김승렬 ( Seung Ryeol Kim ) 한국서양사학회 2011 西洋史論 Vol.0 No.108
This paper tries to make an in-depth comparative analysis of international order between wars and after WWII, based on Kant`s theory on Permanent Peace and Gentz` theory on Balance of Power. The comparative study shows that the system of balance of power in the 19th century has developed into the system of Kantian permanent peace after WWII. International order between wars (Versailles treaties and League of Nations) can be regarded as being transitional from various points of view. European integration has grown to be a peace model in Kantian meaning. However, theories of balance of power and permanent peace should not be considered two different entities opposing each other. The logic of balance of power has worked in and out of European integration. France and the Great Britain played the roles of balance of power against Germany in supranational European Community. It is likely that Western European integration during the Cold War as a whole played the role of balance of power against the USSR. European integration is seemingly opposing the model of balance of power, but in fact have elements of balance of power in the framework of supranationalism. Furthermore, these were not ancillary elements, but essential ones to supranational European integration.