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Yasushita, Chihiro,Kato, Hideki,Kakihana, Masato The Korean Infomation Display Society 2012 Journal of information display Vol.13 No.3
An almost pure phase of $Ba_3Si_6O_{12}N_2$ doped with $Eu^{2+}$ was successfully synthesized through the ammonia nitridation of an oxide precursor prepared through an aqueous-solution method, using propylene- glycol-modified silane. The emission peak intensity of the obtained $Ba_3Si_6O_{12}N_2:Eu^{2+}$ was -2.2 times higher than that of the sample prepared through a solid-state reaction method.
일본 초/중학교간의 제휴/접목에 관한 실증적 연구: 주요 5과목, 기능 4과목, 특별활동, 종합적인 학습시간 및 쉬는 시간에 관한 동기부여와 학업성적의 자기평가와의 관계
오오이에마유미 ( Oie Mayumi ),카키하나신이치로 ( Kakihana Shinichiro ),후지에야스히코 ( Fujie Yasuhiko ),오쿠가와유 ( Okugawa Yu ),이타카쇼코 ( Iitaka Shoko ),우에부치히사시 ( Uebuchi Hisashi ) 성신여자대학교 인문과학연구소 2015 人文科學硏究 Vol.33 No.-
본 연구는 일본 초등학교 5학년부터 중학교 2학년까지의 이행기에 있어 주요 5과목과 기능 4과목, 특별활동, 종합적인 학습시간 및 쉬는 시간의 동기부여의 변용을 검토하는 것을 목적으로 한다. 조사 대상자는 초등학교 5학년 491명(남자 248명, 여자 243명), 초등학교 6학년 486명(남자 224명, 여자 262명), 중학교 1학년 464명(남자 228명, 여자 236명), 중학교 2학년 374명(남자 208명, 여자 166명), 총 1815명(남자 908명, 여자 907명)이며, 모두 일본 수도권의 국공립 초·중학교에 다니는 학생들을 대상으로 하였다. 설문조사 내용은 교과, 교과 외 시간의 선호도 및 학업에 관한 자기평가로 구성되었다. 교과의 취향과, 교과 외 시간의 취향의 득점(기술을 제외한 13시간)을 이용해 클러스터 분석을 사용했다. JP: 교과 선호도와 교과 외 시간의 선호도 득점(기술을 제외한 13시간)을 이용하여 클러스터 분석을 실시하였다. 그 결과, 제1클러스터는 음악, 공작, 미술, 가정, 영어를 싫어하는 경향이 드러나 "기능 과목의 동기 부여가 낮은 그룹"이라고 이름을 붙였다. 한편, 제2클러스터는 주요 5과목의 동기 부여가 낮고, 쉬는 시간이나 급식, 클럽 동아리 활동을 좋아하는 경향을 볼 때 "주요 5과목의 동기부여 가 낮은 그룹"이라 이름을 붙였다. 제3클러스터는 체육, 가정, 공작, 미술을 좋아하면서 주요 5과목의 동기 부여가 낮은 경향이 있어 "기능 과목의 동기부여가 높은 그룹"이라고 이름을 붙였다. 또한 제4클러스터는 전 교과 및 교과 외 시간의 동기 부여가 높아 "전 교과의 동기부여가 높은 그룹"이라고 이름을 붙였다. χ 2검정와 잔차 분석의 결과, 초등학교 5학년이 다른 학년에 비해 기능 과목의 동기부여가 높은 그룹이 많고, 기능 과목의 동기부여, 주요 5과목의 동기부여가 낮은 그룹이 적었다. 중학교 1학년에서는 전 과목의 동기부여가 높은 그룹이 유의하게 많았다. 중학교 2학년에서는 기능 과목의 동기부여가 낮은 그룹이 많고, 한편 기능 과목의 동기부여가 높은 그룹이 적은 것이 밝혀졌다. 또한, 어느 클러스터도 학년이 올라갈수록 학업 성적에 대한 자기 평가가 떨어졌다.
Kim, Jihae,Kato, Hideki,Kakihana, Masato The Korean Infomation Display Society 2012 Journal of information display Vol.13 No.3
We have conducted two kinds of the so-called charge-compensated aliovalent element substitutions to control the photoluminescence properties of $NaAlSiO_4:Eu^{2+}$ with a special focus on the enhancement of the excitation intensity at 400 nm. The aliovalent element substitutions include cation-cation and cation-anion co-substitutions according to the general formulas $Na_{1-x}M_xAl_{1+x}Si_{1-x}O_4:Eu^{2+}$ and $Na_{1-x}M_xAlSiO_{4-x}N_x:Eu^{2+}$ (M = $Mg^{2+}$, $Ca^{2+}$, and $Sr^{2+}$), respectively. The increase in the relative excitation intensity at 400 nm has been achieved in both types of the co-substitutions. Thus, the present research has demonstrated the effectiveness of the charge-compensated element substitution.
김지해,Hideki Kato,Masato Kakihana 한국정보디스플레이학회 2012 Journal of information display Vol.13 No.3
We have conducted two kinds of the so-called charge-compensated aliovalent element substitutions to control the photoluminescence properties of NaAlSiO4:Eu2+ with a special focus on the enhancement of the excitation intensity at 400 nm. The aliovalent element substitutions include cation–cation and cation–anion co-substitutions according to the general formulas Na1−xMxAl1+xSi1−xO4:Eu2+ and Na1−xMxAlSiO4−xNx:Eu2+ (M = Mg2+, Ca2+, and Sr2+), respectively. The increase in the relative excitation intensity at 400 nm has been achieved in both types of the co-substitutions. Thus, the present research has demonstrated the effectiveness of the charge-compensated element substitution.
Phase Transition of PbZrO3 Fine Particles Synthesized by Using the Oxidant-Peroxo Method
Shinya Sawai,H Tanaka,K Tomita,M Kakihana 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
We present results of powder X-ray diraction and DSC measurements of the antiferroelectric phase transition in PbZrO3 .ne particles (down to about 40 nm) synthesized by using the oxidant-peroxo method. With decreasing particle size, the pseudo-tetragonal distortion (1¡cT=aT) at room temperature showed an abrupt decrease below 50 nm, though an apparent decrease in the phase transition temperature was not observed with the temperature-dependent X-ray data. A thermal analysis showed that upon a decrease in the particle size, the endothermic peak on DSC curve associated with the phase transition became broader and shallower and the latent heat decreased, with decreasing peak position temperature. The diusive nature of the phase transition in the .ne particles is discussed, taking account of the grain size distribution in the sample.
Chihiro Yasushita,Hideki Kato,Masato Kakihana 한국정보디스플레이학회 2012 Journal of information display Vol.13 No.3
An almost pure phase of Ba3Si6O12N2 doped with Eu2+ was successfully synthesized through the ammonia nitridation of an oxide precursor prepared through an aqueous-solution method, using propylene- glycol-modified silane. The emission peak intensity of the obtained Ba3Si6O12N2:Eu2+ was −2.2 times higher than that of the sample prepared through a solid-state reaction method.
Synthesis and Luminescence Properties of a Cyan-blue Thiosilicate-based Phosphor $SrSi_2S_5:Eu^{2+}$
Nakamuraa, Masayoshi,Katoa, Hideki,Takatsuka, Yuji,Petrykinc, Valery,Tezuka, Satoko,Kakihana, Masato The Korean Infomation Display Society 2010 Journal of information display Vol.11 No.4
A series of Sr-Si-S compounds was synthesized using an advanced chemical method in which the use of one solution-based process uniformly dispersed the $Eu^{2+}$ activators in the host crystals, to find new compositions that would suit phosphor applications. Particular focus was given to the Si-rich region. This led to the synthesis of a single-phase compound that showed an unknown X-ray diffraction pattern. This compound had a composition close to that of $SrSi_2S_5$. When this compound is activated with $Eu^{2+}$ ($SrSi_2S_5:Eu^{2+}$), it shows a cyan-blue emission with a main luminescence peak at 495 nm. This emission is excited by wavelengths of 250-440 nm and has a maximum excitation at 350 nm.
New design of nano-structured SrTiO<sub>3</sub> powder using a cellulose-assisted LPP method
Roh, Yoon Ah,Kang, Bong Kyun,Song, Young-Hyun,Masato, Kakihana,Masaki, Takaki,Yoon, Dae-Ho Elsevier 2016 CERAMICS INTERNATIONAL Vol.42 No.7
<P><B>Abstract</B></P> <P>Strontium titanate (SrTiO<SUB>3</SUB>) powder has been prepared through a liquid-phase precursor (LPP) method involving strontium (Sr) acetate and different types of titanium (Ti) raw materials; the powders were synthesized using two kinds of lactate complex and TiCl<SUB>3</SUB>. The effects from the addition of the Ti raw materials to the nanostructure and the resultant synthetic efficiency were investigated in this work for the development of nano-sized particles and a low firing temperature. The morphology and size of the SrTiO<SUB>3</SUB> nanopowders were controlled by adjusting the Sr- and Ti-precursor concentrations and the selection of the type of Ti raw material. The most-effective raw material was selected and then used as the basis for the attainment of the results in accordance with the ratio. Using X-ray diffraction (XRD), phase analyses of the samples calcined at different temperatures and compositions were performed. SEM was used for the characterization of the morphologies of the raw materials and reaction products, and they varied from ~25nm to ~50nm.</P>