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Yoshio Nikawa,Akira Ishikawa 한국전자파학회JEES 2010 Journal of Electromagnetic Engineering and Science Vol.10 No.4
Recent development of magnetic resonance imaging (MRI) equipment enables interventional radiology (IVR) as diagnosis and treatment under MRI usage. In this paper, a new methodology for magnetic resonance (MR) scanner to apply not only diagnostic equipment but for treatment one is discussed. The temperature measuring procedure under MR is to measure phase shift of T₁, which is the longitudinal relaxation time of proton, for the position inside a sample material with the application of pulsed RF for heating inside the sample as artificial dielectrics. The result shows the possibility to apply MR as temperature measuring equipment and as a heating equipment for applying such as hyperthermia heating modality.
Study on Satellite Communications using Ultra Wideband (UWB) Signals
Kunisawa, Yoshio,Ishikawa, Hiroyasu,Iwai, Hisato,Shinonaga, Hideyuki 통신위성우주산업연구회 2003 Joint Conference on Satellite Communications Vol.2003 No.-
In this paper, the possibility of satellite communication systems using a multiband UWB signal format is considered. For terrestrial short-distance high-speed communications, multiband UWB schemes are proposed in IEE 802.15 TG3a and the discussion is ongoing at the standardization body. In the multiband UWB scheme, frequency hopping is adopted over 3.1-10.6 GHz, which is regulated by the FCC (Federal Communication Commission) of the U.S.A., and the bandwidth of one hopping spectrum (subband) is about 500 MHz. Multiband technology inherently has some suitable characteristics for terrestrial UWB such as applicability to variable transmission rates, avoidance of harmful interference to other systems, simple localizability of frequency allocations, and so forth. In this paper, a satellite communication downlink employing the multiband UWB signal transmission is considered. The total bandwidth is assumed to be 500 MHz in the allocation of the satellite downlink and it is divided into multiple subbands. We report the initial results of the study on the link budget calculation and the estimation of the signal transmission speed assuming multiband UWB signal transmission from a GSO satellite to the earth's surface.
Correlation between Cr Distribution and Ferromagnetism in Iodine-Doped (Zn,Cr)Te
Nozomi Nishizawa,Koichiro Ishikawa,Shinji Kuroda,Koki Takita,Masanori Mitome,Yoshio Bando,Tomasz Dietl 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
zation measurements and structural and chemical characterizations were performed on a series of epitaxial lms grown by molecular beam epitaxy. The magnetic properties of (Zn,Cr)Te films were altered significantly by co-doping charge impurities or by changing Zn and Te flux supplies during epitaxy. The nano-scale probing of the constituent elements using energy-dispersive X-ray spectroscopy (EDS) revealed that the Cr distribution in the crystal was clearly correlated with the ferromagnetic properties and the origin of high-temperature ferromagnetism was the formation of nano-scale Cr-rich regions in inhomogeneous Cr distributions. As an origin of the variation of the uniformity of Cr distribution, it is proposed that the aggregation energy of Cr ions is modified by the deviation of the Cr charge state which is manipulated by the co-doping or the deviation from stoichiometry.
Perfluoropolymer Surface for Shock-free Homeotropic Alignment of Smectic Liquid Crystals
Jeong, Soon Moon,Kim, Jin Ki,Shimbo, Yoshio,Araoka, Fumito,Dhara, Surajit,Ha, Na Young,Ishikawa, Ken,Takezoe, Hideo WILEY-VCH Verlag 2010 ADVANCED MATERIALS Vol.22 No.1
<B>Graphic Abstract</B> <P>Perfect homeotropic alignment of smectic liquid crystals is demonstrated using an amorphous perfluoropolymer as an alignment layer (see figure). The hydrophobic surface of the perfluoropolymer allows rapid recovery to the homeotropic orientation from the damaged layer structure caused by mechanical shock— for example pressing with tweezers— or crystallization. <img src='wiley_img/09359648-2010-22-1-ADMA200901777-content.gif' alt='wiley_img/09359648-2010-22-1-ADMA200901777-content'> </P>
Development of Flight Simulator for Human-Powered Aircraft
Yasuhiro Inaba,Yuzo Shimada,Kenji Uchiyama,Kenichi Abe,Yoshio Ishikawa,Takao Sugimoto,Yasuyuki Miyazaki,Yuzo Koyama,Shohei Onishi,Kazuo Matubara,Chikatoshi Satoh,Takao Minejima,Kaname Hirayanagi,Michi 제어로봇시스템학회 2006 제어로봇시스템학회 국제학술대회 논문집 Vol.2006 No.10