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DEVELOPMENT OF A WIRELESS COMMUNICATION SYSTEM BASED ON BLUETOOTH ENABLE MOBILE PHONE
Yukiko YAMAKAWA,Yoshihiro YASUTAKE,Koichiro TANAKA 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper presents a communication system with a mobile phone which supports Bluetooth wireless communication technologies, and reports evaluation of the system. To make various devices transfer data anytime, anywhere, we adopt the mobile phone as a gateway that becomes a core in the wireless communication. We evaluate the performance of Bluetooth equipped in the mobile phone at first, and develop a communication gateway program on Symbian OS. The evaluation is performed in demonstration experiment. The result shows that our system on the mobile phone satisfies the requirements as the communication gateway. Moreover, for improving the performance of data transfer time, we develop data compression program. We have confirmed that our system achieved the effective and on-demand wireless communication.
Iwamoto, Masachika,Ogawa, Daisuke,Yasutake, Yuhsuke,Azuma, Yasuo,Umemoto, Hisashi,Ohashi, Kazunori,Izumi, Noriko,Shinohara, Hisanori,Majima, Yutaka American Chemical Society 2010 The Journal of Physical Chemistry Part C Vol.114 No.35
<P>We identified the orientation of individual Lu@C<SUB>82</SUB> molecules on alkanethiol self-assembled monolayers (SAMs) by scanning tunneling microscopy (STM) at a molecular resolution. STM images of Lu@C<SUB>82</SUB> on alkanethiol SAMs at 65 K showed a striped structure corresponding to the molecular orbitals of the Lu@C<SUB>82</SUB> molecule, suggesting that thermal rotation of Lu@C<SUB>82</SUB> on alkanethiol SAMs is prevented at 65 K. By comparing these molecular-resolution STM images with Kohn−Sham molecular orbitals of Lu@C<SUB>82</SUB> calculated by density functional theory (DFT), we identified the molecular orientation of Lu@C<SUB>82</SUB>. Spatial mapping of the differential conductance on individual Lu@C<SUB>82</SUB> molecules revealed that the local conductivity within a molecule became large around the Lu atom at a negative sample bias voltage. From spatial mapping of the differential conductance measurements, we also evaluated the HOMO−LUMO gap of Lu@C<SUB>82</SUB> to be 0.47 eV. From the results of the spatial mapping of the differential conductance and DFT calculations, the locally high conductivity around the Lu atom was attributed to the HOMO-2 level orbital concentrated on the Lu atom and its six nearest C atoms at 0.055 eV below the HOMO level. We demonstrated changes in the molecular orientation of Lu@C<SUB>82</SUB> by applying a high electric field (about 1 × 10<SUP>7</SUP> V/cm) with a large tunneling current (1.5 nA).</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2010/jpccck.2010.114.issue-35/jp1023394/production/images/medium/jp-2010-023394_0007.gif'></P>
Hiroyuki Maeda,Yoshihiro Yasutake,Azumi Iihoshi,Koichiro Tanaka 대한전자공학회 2018 IEIE Transactions on Smart Processing & Computing Vol.7 No.1
The training of embedded software engineers in educational institutions is required for embedded systems companies. We focus on computer architecture education for learning about the operations and architectures of processors. We use the Kyutech Easily Reconstructive Naked Educational (KERNEL) system, which was designed for computer architecture education. The KERNEL system enables users to observe the internal architecture and states of processors during execution. It helps beginners to learn the basics of a computer architecture by writing their programs into the KERNEL memory so they can observe the processor’s execution. This paper describes a field-programmable gate array (FPGA)-based educational system cooperating with mobile applications, and offers a performance evaluation of its wireless communications. The system consists of an FPGA board implemented with one"s own K16 model processor that designed for computer hardware educations in the KERNEL system and mobile applications that become a console for setting and displaying the internal state of the processor. It is possible for users to write their programs, set registers in the processor, and observe the internal state of the processor during execution by using a mobile application. Communications between the FPGA and the mobile application uses classic Bluetooth and Bluetooth Low Energy technology.
Synthesis of Nickel-doped Transparent Glass-ceramics for Ultra-broadband Optical Fiber Amplifiers
Takenobu Suzuki,Yusuke Arai,Yasutake Ohishi 한국세라믹학회 2007 세라미스트 Vol.10 No.3
The structural and optical properties of Ni-doped σansparent glass-ceramics are reviewed. The quantum efficiencies of ceramics were examined to explore suitable crystalline phase for Ni-doping in glass-ceramics. Inverse spinel LiGa5O8 have the quantum efficiency of almost 100% at room temperature. Transparent glass ceramics containing LiGa5O8 was successfully synthesized by heat treatment of LiO2-Ga2O3r-SiO2-NiO glass. Most of Ni2+ ions in glassceramic were incorporated into LiGa5O8 nanocrystals. The near-infrared emission covering from the O-band to L-band (1260-1625 nm) was observed from the Ni-doped LiO2-Ga2O3-SiO2 glass-ceramic though it was not observed from the as-cast glass. The lifetime of the emission was about 580 μsec even at 300K. The emission quantum efficiency was evaluated as about 10 % that is enough high for practical usage as gain media of optical fiber amplifiers. The figure of merit (the product of the stimulated emission cross section and lifetime) was as high as that of rare-earth-doped glasses, The broad bandwidth, high quantum efficiency and high figure of merit show that transparent glass-ceramics containing Nt2+: LiGa5O8 nanocrystals are promising candidates as novel ultra-broadband gain media.