• Journal of the Korean Applied Science and Technology
• /
• v.15 no.2
• /
• pp.67-75
• /
• 1998

The Cuo-Magnetite and ZnO-Magnetite catalysts with various of Cuo and ZnO mole% for Carbon Dioxide decomposed reaction synthesized. The catalysts were reduced by $H_2$ at $350^{\circ}C$ for 3 hours. The temperature was obtained by TGA and DSC experiments. The structures of catalysts were confirmed by X-ray diffraction experiment. The surface area of catalysts is $15{\sim}27\;m^2/g$. The results of Carbon Dioxide decomposed ability was better $H_2-reduced$ magnetite catalysts with 0.03 mole% CuO and 0.03 mole% ZnO than others catalysts. After Carbon Dioxide decomposed reaction, catalysts were reacted $H_2$ and created only methane.

• Proceedings of the Korea Contents Association Conference
• /
• 2004.11a
• /
• pp.461-465
• /
• 2004

In this paper, we examined receiving parameters of IMT-2000 receiving system and also analyzed them through simulation based on the minimum specification of DCS and PCS mobile station. As a result of simulation, noise figure which is the parameter of specification of the receiving sensitivity is 7.21dB, 6.03dB, and 7.89dB in case of DCS, PCS and IMT-2000 respectively. Therefore we found the receiving sensitivity of IMT-2000 mobile station lower than that of DCS and PCS.

• Proceedings of the Korea Technology Innovation Society Conference
• /
• 2004.11a
• /
• pp.7-17
• /
• 2004

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2001.07a
• /
• pp.806-808
• /
• 2001

In this thesis, specimens was manufactured in general method annexing PMB-PZT system ceramic, and the following conclusion has been deduced. In XRD, the crystal structure of ceramic has the tetragonal structure which is close to rombohedral structure, and consequently the specimen characterized by MPB was manufactured. According to dopping with xPMB, electromechanical factor(kp) little is changed. kp was maximum value 23.37[%] at xPMB 0.03[mol%]. mechanical quality factor(Qm) was maximum value 237.04 at xPMB 0.03[mo1%].

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2002.07b
• /
• pp.578-580
• /
• 2002

In this thesis, specimens was manufactured in general method annexing PMB-PZT system ceramic, and the following conclusion has been deduced. In XRD, the crystal structure of ceramic has the tetragonal structure which is close to rombohedral structure, and consequently the specimen characterized by MPB was manufactured. According to dopping with xPMB, electromechanical factor(kp) little is changed. kp was maximum value 23.37[%] at xPMB 0.03[mol%]. mechanical quality factor(Qm) was maximum value 237,04 at xPMB 0.03[mol%].

• Korean Journal of Soil Science and Fertilizer
• /
• v.29 no.3
• /
• pp.218-225
• /
• 1996

Using water vapor adsorption data foe some typical Korean soils. we calculated the adsorption energy distribution functions and average adsorption energies for these soils using theory of adsorption on hetergeneous surfaces. As a local adsorption models the BET and a new Aranovich equations were applied. The distribution functions were broad, indicating rather high energetic inhomogeneity of the surface.

• Electronics and Telecommunications Trends
• /
• v.19 no.4 s.88
• /
• pp.135-141
• /
• 2004

본 논문에서는 국내 무선설비규칙의 불요발사 규정과 관련하여 2003년도 세계전파통신회의(World Radiocommunication Conference-03)의 의제 중 하나인 불요발사에 관한 전파규칙의 내용을 소개한다. 최근 ITU-R은 WRC-03 전파규칙의 불요발사 규정에서 스퓨리어스 발사의 측정기준을 위하여 대역외영역과 스퓨리어스영역의 개념을 새롭게 정의한 후 두 영역 사이의 경계기준을 정하였다. 따라서 본 논문에서는 ITU-R의 불요발사 영역개념과 경계기준을 분석하고, 이를 바탕으로 무선설비규칙 제5조 스퓨리어스발사의 허용치에 관한 개정의견을 제시하였다.

• Corrosion Science and Technology
• /
• v.14 no.4
• /
• pp.184-189
• /
• 2015

In this study, the combined effect of chloride and thiosulfate ions and the effect of the ratio of the two ions on passivation in 304L, 316L, and the duplex stainless steels 2101 and 2205 are investigated using potentiostatic scratch tests. Cyclic polarization and the scratch tests were used to understand the role of anions on localized corrosion in these systems. It was found that the thiosulfate pitting began at a lower potential for 2101 than 304L in 0.6 M NaCl + 0.03 M $Na_2S_2O_3$ solution. The pit morphologies for 304L, 316L, and 2101 in an 0.6 M NaCl + 0.03 M $Na_2S_2O_3$ solution were very different from each other. The results indicate that the pitting switches from predominately thiosulfate pitting to chloride pitting at approximately 0.1 V.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.12 no.4
• /
• pp.615-620
• /
• 2017

In this study, we have developed the resistive leakage current detecting and tripping circuit breaker based on a 32bit ARM processor. The developed leakage circuit breaker can be operated in a desired trip threshold within 0.03 seconds as specified in KS C 4613. This resistive leakage current breaker is expected to be applicable as a circuit breake for prevention of electric fires and electric shock in smart distribution panel.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2010.05a
• /
• pp.351-352
• /
• 2010

This study is a quality evaluation using rapid water content test of concrete pavement. The estimated water content of concrete investigated less than $6.6kg/m^3$, in the laboratory, but measured more than $28kg/m^3$ on batch plant comparing to design water content. The average flexural strength shows 6.03MPa.