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김선재 ( Seon J. Kim ),윤영채 ( Young C. Yoon ),김범환 ( Bum H. Kim ),김정숙 ( Jeong S. Kim ),이철호 ( Chul H. Lee ) 한국지역개발학회 2004 韓國地域開發學會誌 Vol.16 No.2
The purpose of this study is to examine the impact of the new administrative capital transfer on rental housing demand in Daejon, Korea through the estimation of rental housing demand equation. The study focuses on the statistical estimation issues encountered in calibrating rental housing demand: selectivity bias, estimation of hedonic prices, and application of the permanent income hypothesis. The results show a tenant has a higher marginal probability of being a tenant household than of being a homeowner and less demand for housing services after the announcement of the new administrative capital transfer.
권용진(Y. J. Kwon),김선재(S. J. Kim),박경락(K. R. Park),옥유관(Y. K. Ok) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
본 논문은 기존 Reamer Bolt 사용시 발생하는 여러가지 문제점을 해결하고 고가의 수입품을 대체하기 위한 유압식 커플링 볼트의 국산화를 소개하였다.
기계적 합금화법을 이용한 전이금속 도핑에 따른 TiO<sub>2</sub>분말의 광촉매 특성
우승희,김흥회,김선재,이창규,Woo S.H.,Kim W.W.,Kim S.J.,Rhee C.K. 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.4
Transition metal ions($Ni^{2+}$, $Cr^{3+}$ and $V^{5+}$) doped $TiO_2$ nanostructured powders were synthesized by mechanical alloying(MA) to shift the adsorption threshold into the visible light region. The synthesized powders were characterized by XRD, SEM, TEM and BET for structural analysis, UV-Vis and photoluminescence spectrum for the optical study. Also, photocatalytic abilities were evaluated by decomposition of 4-chlorophenol(4CP) under ultraviolet and visible light irradiations. Optical studies showed that the absorption wavelength of transition metal ions doped $TiO_2$ powders moved to visible light range, which was believed to be induced by the energy level change due to the doping. Among the prepared $TiO_2$ powders, $NiO^{2+}$ doped $TiO_2$ powders, showed excellent photooxidative ability in 4CP decomposition.
균일침전시 여러 가지 금속염화물들을 첨가하여 제조된 TiO<sub>2</sub> 나노 분말들의 광산화 능력 평가
황두선,이남희,이희균,김선재,Hwang D. S,Lee N. H,Lee H. G,Kim S. J 한국재료학회 2004 한국재료학회지 Vol.14 No.4
Transition metal ions doped $TiO_2$ nanostructured powders were prepared with simply heating aqueous $TiOCl_2$ solutions, contained various metal ions (Ni, Al, Fe, Zr, and Nb) of 1.47 mol% added as metal-chlorides, at $100^{\circ}C$ for 4 hrs by homogeneous precipitation process under suppressing conditions of water vaporization. The characterizations for prepared $TiO_2$ powders were carried out to observe doping of metal ions, their concentrations and microstructures using XRD, UV-VIS (DRS), XPS, SEM, TEM and ICP. Also, photo-oxidative abilities were evaluated by decomposition of 4-chlorophenol (4CP) under ultraviolet light irradiations. No secondary oxide phases were formed in all the $VTiO_2$ powders, showing doping with various transition metal ions. When adding ions ($Ni^{2+}$ or$ Al^{3+ }$ and $Zr^{4+}$ ) having valance states or ionic radii greatly different from those of $Ti^{4+}$ , the $TiO_2$ powders of mixed anatase and rutile phases were formed, whereas in the case of additions of $^Fe{3+ }$ and $Nb^{ 5+}$ as well as no addition of metal ion the powders with pure rutile phase alone were formed. Among the prepared $TiO_2$ powders, Ni$^{2+}$ doped $TiO_2$ powders, containing a small amount of anatase phase, showed excellent photo-oxidative ability in 4CP decomposition because of relative decreases in electron-hole recombination and poisoning of $TiO_2$ surface during the photoreaction.n.
전이금속원소들이 첨가된 나노 티타니아 졸 및 코팅막 제조
이강,이남희,신승한,이희균,김선재,Lee K.,Lee N. H.,Shin S. H.,Lee H. G.,Kim S. J. 한국재료학회 2004 한국재료학회지 Vol.14 No.9
The photocatalytic performance of $TiO_2$ thin films coated on porous alumina balls using various aqueous $TiOCl_2$ solutions as starting precursors, to which 1.0 $mol\%$ transition metal ($Ni^{2+},\;Cr^{3+},\;Fe^{3+},\;Nb^{3+},\;and\;V^{5+}$) chlorides had been already added, has been investigated, together with characterizations for $TiO_2$ sols synthesized simultaneously in the same autoclave through hydrothermal method. The synthesized $TiO_2$ sols were all formed with an anatase phase, and their particle size was between several nm and 30 nm showing ${\zeta}-potential$ of $-25{\sim}-35$ mV, being maintained stable for over 6 months. However, the $TiO_2$ sol added with Cr had a much lower value of -potential and larger particle sizes. The coated $TiO_2$ thin films had almost the same shape and size as those of the sol. The pure $TiO_2$ sol showed the highest optical absorption in the ultraviolet light region, and other $TiO_2$ sols containing $Cr^{3+},\;Fe^{3+}\;and\;Ni^{2+}$ showed higher optical absorption than pure sol in the visible light region. According to the experiments for removal of a gas-phase benzene, the pure $TiO_2$ film showed the highest photo dissociation rate in the ultraviolet light region, but in artificial sunlight the photo dissociation rate of $TiO_2$ coated films containing $Cr^{3+},\;Fe^{3+}\;and\;Ni^{2+}$ was measured higher together with the increase of optical absorption by doping.