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Gd<sub>2</sub>O<sub>3</sub> 첨가에 따른 AC PDP 보호막용 MgO 박막의 광학적.전기적 특성
김창일,임은경,박용준,이영진,백종후,최은하,정석,김정석,Kim, Chang-Il,Lim, Eun-Kyeong,Park, Young-Jun,Lee, Young-Jin,Paik, Jong-Hoo,Choi, Eun-Ha,Juang, Seok,Kim, Jeong-Seok 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.7
The effects of $Gd_2O_3$ addition and sintering condition on optical and electrical properties of MgO films as a protective layer for AC plasma display panels were investigated. Doped MgO films prepared by the e-beam evaporation have a higher ${\Upsilon}$ (secondary electron emission coefficient) than pure MgO protective layer. Relative density and grain size increased with amount of $Gd_2O_3$ up to 100 ppm and then decreased further addition. These results showed that discharge properties and optical properties of MgO protective layers seemed to be closely related with microstructure factors such as relative density and grain size. Good optical and electrical properties of ${\Upsilon}$ of 0.138, surface roughness of 5.77 nm and optical transmittance of 95.76 % were obtained for the MgO+100 ppm $Gd_2O_3$ protective layer sintered at $1700^{\circ}C$ for 5 hrs.
A FIXED POINT APPROACH TO STABILITY OF ADDITIVE FUNCTIONAL INEQUALITIES IN FUZZY NORMED SPACES
김창일,박세원 충청수학회 2016 충청수학회지 Vol.29 No.3
In this paper, we investigate the solution of the follow- ing functional inequality N(f(x) + f(y) + f(z); t) ¸ N(f(x + y + z); mt) for some ¯xed real number m with 1 3 < m · 1 and using the ¯xed point method, we prove the generalized Hyers-Ulam stability for it in fuzzy Banach spaces.
ZrO<sub>2</sub> 첨가에 따른 AC PDP 보호막용 MgO 박막의 광학적 전기적 특성
김창일,정영훈,이영진,백종후,최은하,정석,김정석,Kim, Chang-Il,Jung, Young-Hun,Lee, Young-Jin,Paik, Jong-Hoo,Choi, Eun-Ha,Jung, Seok,Kim, Jeong-Seok 한국재료학회 2008 한국재료학회지 Vol.18 No.8
The effects of an addition of $ZrO_2$ on the microstructure and electrical properties of MgO films as a protective layer for AC plasma display panels were investigated. MgO + a 200 ppm $ZrO_2$ protective layer prepared by e-beam evaporation exhibited a secondary electron emission coefficient ($\gamma$) that was improved by 21% compared to that of a pure MgO protective layer. The relative density and Vickers hardness increased with a further addition of $ZrO_2$. These results suggest that the discharge properties and optical properties of MgO protective layers are closely related to the relative density and Vickers hardness. The good optical and electrical properties of $\gamma$, at 0.080, a grain size of $19\;{\mu}m$ and an optical transmittance of 91.93 % were obtained for the MgO + 200 ppm $ZrO_2$ protective layer sintered at $1700^{\circ}C$ for 5 hrs.
Wallman covers and Stone-\v{C}ech compactifications of cloz covers
김창일 호남수학회 2015 호남수학학술지 Vol.37 No.3
In this paper, we investigate $T_1$ Boolean subalgebras of the Boolean algebra consisting all regular closed sets in a space and their Wallman covers. In particular, we will give sufficient and necessary conditions of spaces $X$ satisfying $\beta E_{cc}(X) = E_{cc}(\beta X)$.
가로등 제어용 다층패드형 압전 하베스터의 개발 및 평가
김창일,정영훈,박운익,조정호,장용호,최범진,박신서,백종후,Kim, Chang-Il,Jeong, Young-Hun,Park, Woon Ik,Cho, Jeong-Ho,Jang, Yong-Ho,Choi, Beom-Jin,Park, Shin-Seo,Paik, Jong-Hoo 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.11
In this study, to increase output of road piezoelectric energy harvester, it was made into rack type in which many piezoelectric materials can be installed and load transfer device of the leverage type to transfer vehicle load was made. By paving it in the road, the output characteristics depending on vehicle load and speed were evaluated. Changing vehicle load, harvester output characteristics depending on speed changes were evaluated at the interval of 10 km/h from 10 km/h to 100 km/h. Also, by making a wireless switch and sending wireless signal with output of rack type harvester, whether to receive it was evaluated by distance. It was checked that all switches work up to front-to-back 100 m from harvester.
MINIMAL BASICALLY DISCONNECTED COVER OF WEAKLY P-SPACES AND THEIR PRODUCTS
김창일 한국수학교육학회 2010 純粹 및 應用數學 Vol.17 No.2
In this paper, we introduce the concept of a weakly P-space which is a generalization of a P-space and prove that for any covering map f : X ¡! Y , X is a weakly P-space if and only if Y is a weakly P-space. Using these, we investigate the minimal basically disconnected cover of weakly P-spaces and their products.
NORMAL FUZZY PROBABILITY FOR GENERALIZED QUADRATIC FUZZY SETS
김창일,윤용식 충청수학회 2012 충청수학회지 Vol.25 No.2
A generalized quadratic fuzzy set is a generalization of a quadratic fuzzy number. Zadeh dees the probability of the fuzzy event using the probability. We dee the normal fuzzy prob-ability on R using the normal distribution. And we calculate the normal fuzzy probability for generalized quadratic fuzzy sets.
A FIXED POINT APPROACH TO THE STABILITY OF ADDITIVE-QUADRATIC FUNCTIONAL EQUATIONS IN MODULAR SPACES
김창일,박세원 충청수학회 2015 충청수학회지 Vol.28 No.2
In this paper, we prove the generalized Hyers-Ulam stability for the following additive-quadratic functional equation f(2x + y) + f(2x y) = f(x + y) + f(x y) + 4f(x) + 2f( x) in modular spaces by using a xed point theorem for modular spaces.
Minimal quasi-F covers of some extension
김창일,정갑헌 충청수학회 2013 충청수학회지 Vol.26 No.2
Observing that every Tychonoff space X has an extension kX which is a weakly LindelÄof space and the minimal quasi-F cover QF(kX) of kX is a weakly LindelÄof, we show that ΦkX :QF(kX) → kX is a z#-irreducible map and that QF(βX)=βQF(kX). Using these, we prove that QF(kX) = kQF(X) if and only if ΦkX : kQF(X) → kX is an onto map and βQF(X) =QF(βX).
The canonical form of involutary fuzzy matrices
김창일,박세원 충청수학회 2014 충청수학회지 Vol.27 No.4
We study special types of matrices. The involutary fuzzy matrices are important in various applications and have many interesting properties. Using the graphical method, we have the zero patterns of involutary fuzzy matrix, that is, involutary Boolean matrices. And we give the construction of all involutary fuzzy matrices for some dimensions and suggest the canonical form of involutary fuzzy matrix.