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오철환,오남순 한국유기농업학회 2016 韓國有機農業學會誌 Vol.24 No.1
Qualitiy characteristics such as moisture content, pH, acidity, sugar content, salinity, appearance, flavor, taste, color and overall acceptance of apple Jangachi cured with different traditional Korean sauces (Kochujang, Doenjang, Kanjang) were investigated during storage time. The initial moisture content of the apple Jangachi was an average of 14.97%. But after curing with the three sauces (Kochujang, Doenjang, and Kanjaing) moisture content increased to 27~28%, 41~ 4% and 56~58%, respectively. The pH was 4.84-5.42 regardless of sauce. Total acidity increased from 0.4%, 0.34%, 0.34% to 1.14%, 0.60%, 0.67%. respectively. But acidity decreased after 10 days. Sugar content of apple jangachi decreased throughout the aging time regardless of sauce type. Salinity of apple Jangachi increased to a certain level during storage time regardless of sauce type. Apple Jangachi softened during storage as they increased in moisture content. All sensory characteristics of Kocuhjang apples showed a higher score than Doenjang and Kanjang. Overall, Kocuhjang seems most appropriate for curing apple Jangachi.
오철환,정병태 慶北大學校 1987 論文集 Vol.44 No.-
The HCP(Hypocycloidal pinch) device has been used for pumping a dye laser. The characteristics of LD 490 dye laser pumped by the device has been studied for various electrical input energies applied to it and argon fill pressure in it. The used LD 490 dye concentration in methanol solution was 4 exp (-4)M/l. The rise time of the pumping light is measured to be about 0.5μsec, its FWHM is about 1㎲ and its ringing period is 2.5μsec when the charging voltage to the energy storage capacitor (15㎌) is 8KV and argon fill pressure is 1.5 Torr. The spectral intensity of the visible light from the HCP is stronger than that of ultraviolet range, refering the response on the black-white film pictured by the UV-visible spectrometer. The FWHM of laser pulse is varied from 0.5μsec to 2μsec as the charging voltage is increased from 6KV to 9KV. The optimum pressure in HCP for the pumping of LD 490 dye solution is measured to be 1.5 Torr. The laser output energy does not increase linearly with the input energy, because of the sputtering phenomenon on the dye cuvette due to the evaporation of aluminum electrodes of the HCP. The input threshold energy per unit volume of the dye cuvette is about 24 J/㎤ when the inner diameter of the dye cuvette is 8.8mm.
오철환 서울교육대학교 2001 한국초등교육 Vol.12 No.2
Pstmodernism is a process which dissolved absolutism and intensified relativism. Jacques Derrida and Michel Foucault made and attack on Hegelianism and meta language used in justification of Nazism. The idea of centralism, such as Angelosaxonism, Europeanism, masculinism, theretofore propagated had lost its way. Hence came 'the death of centralism'. The criteria such as religion, government, morality which made the significant meaning of the development of the western intellect were broken and the only remaining criterion was 'individual evaluation'.