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Takeshi Uematsu,Noriyuki Hirano,Tamotsu Ninomiya,Masahito Syoyama 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
A three-arm PWM UPS is realizable low price and small size UPS In this UPS configuration, the center arm operates in both PWM converter mode and PWM inverter mode. Therefore, the operation of this UPS differs from the conventional UPS. In this paper, the three-arm PWM UPS is analyzed and a trial product is realized.<br/>
A novel bluish green-emitting RbBaScSi3O9 : Eu2+ phosphor for white LEDs
Takeshi Abe,김선욱,Tadashi Ishigaki,Kazuyoshi Uematsu,Kenji Toda,Mineo Sato 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.3
A novel bluish green-emitting silicate phosphor, RbBaScSi3O9 : Eu2+, was synthesized by a conventional solid state reaction method. The RbBaScSi3O9 : Eu2+ phosphor can be excited by a near-UV and blue light irradiation and presents a bluish green band centered at 500 nm due to the allowed transition from 4f6 5d1 to 4f7 of Eu2+. The maximum emission peak intensity was obtained at the composition of RbBaScSi3O9 : 10 mol%Eu2+, and the emission intensity was 13% compared with that of the commercial YAG phosphor.
Uematsu, Yasushi,Sone, Takayuki,Yamada, Motohiko,Hongo, Takeshi Techno-Press 2002 Wind and Structures, An International Journal (WAS Vol.5 No.6
The main purpose of this study is to discuss the design wind loads for the structural frames of single-layer latticed domes with long spans. First, wind pressures are measured simultaneously at many points on dome models in a wind tunnel. Then, the dynamic response of several models is analyzed in the time domain, using the pressure data obtained from the wind tunnel experiment. The nodal displacements and the resultant member stresses are computed at each time step. The results indicate that the dome's dynamic response is generally dominated by such vibration modes that contribute to the static response significantly. Furthermore, the dynamic response is found to be almost quasi-static. Then, a series of quasi-static analyses, in which the inertia and damping terms are neglected, is made for a wide range of the dome's geometry. Based on the results, a discussion is made of the design wind load. It is found that a gust effect factor approach can be used for the load estimation. Finally, an empirical formula for the gust effect factor and a simple model of the pressure coefficient distribution are provided.
Takeshi Abe,윤대호,김선욱,Tadashi Ishigaki,Kazuyoshi Uematsu,Mineo Sato,Takaki Masaki,Kenji Toda 한국정보디스플레이학회 2014 Journal of information display Vol.15 No.1
A yellow-emitting silicate phosphor, NaAlSiO4:Eu2+,was synthesized through a new reducing technique, using SiO powder as a silica source, during the preparation process. The addition of SiO powder as a silica source significantly enhanced the Eu2+ content, which led toan increase in the photoluminescence emission intensity of the NaAlSiO4:Eu2+ phosphor.The optimization of the composition resulted in obtaining themaximum emission intensityfor NaAlSiO4:7mol% Eu2+.