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OPTIMAL GEVREY EXPONENTS FOR SOME DEGENERATE ELLIPTIC OPERATORS
Matsuzawa, Tadato Korean Mathematical Society 1998 대한수학회지 Vol.35 No.4
We shall show first general Metivier operators ${D_y}^2+(x^{2l}+y^{2k}){D_x}^2,l,k=1,2,....,have {G_{x,y}}^{{\theta,d}}$-hypoellipticity in the vicinity of the origin (0,0), where $\theta=\frac{l(1+k)}{l(1+k)-k},\;d=\frac{\theta+k}{1+k}$ (>1), and finally the optimality of these exponents {$\theta$, d} will be shown.
Systematization of Flight Instruction and Control for Autonomous Helicopter
Yuto Matsuzawa,Yuta Tozaki,Yuji Kameda,Masuhiro Nitta,Kiyotaka Kato 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
A radio-controlled (RC) helicopter can be used in the fields of aerial crop dusting, aerial photography, and many more. However, controlling a RC helicopter needs advanced techniques. Therefore, a flight instruction system that provides guidance on how to fly a RC helicopter is required. Examples that give flight instructions to an autonomous helicopter have been reported, but those had been designed and developed individually. To extend the application of an autonomous helicopter to an indoor environment, such as a factory, the systematization and standardization of flight instructions are required. From this, each flight instruction generative system that has been prepared for individual use can generate common flight instructions. Likewise, an autonomous helicopter can operate based on the common flight instructions designed for various purposes. In this paper, we have defined flight instruction codes based on the Numerical Control (NC) code system that has been used for a machine tool. In addition, we have systematized instruction codes. To verify such a system, an autonomous flight control system has been developed for indoor use and a flight experiment has been performed. As a result, we were able to confirm that the helicopter flew by executing the flight instructions that have been read.
Symposium 1 : Metabolic Syndrome ; Adipocytokines and Metabolic Syndrome
( Yuji Matsuzawa ),( T. Funahashi ),( T. Nakamura ) 한국지질동맥경화학회 ( 구 한국지질학회 ) 2002 韓國脂質學會誌 Vol.12 No.1
Metabolic syndrome is a clinical syndrome in which multiple risks are clustering in each individual and is a common basis of vascular disease in the industrial countries. The molecular basis of metabolic syndrome, however, has not been elucidated. We have
Koura, Nobuyuki,Matsuzawa, Hidenori,Kato, Tomoki,Idemoto, Yasushi,Matsumoto, Futoshi The Korean Electrochemical Society 2002 한국전기화학회지 Vol.5 No.4
The structure of species formed in $NbCI_5-I-ethyl-3-methylimidazolium$ chloride (EMIC) room-temperature molten salt (RTMS) was examined with the Raman spectroscopic measurement and ab initio molecular orbital calculation. The equilibrium structures of $NbCl_5,\;NbCl_6^-,\;Nb_2CI_{10},\;Nb_2CI_{11}^-,\;Nb_3CI_6^-,\;NbCI_6^--EMI^+\;(in\;which\;NbCI_6^-$ anion approaches $EMI^+$ cation with strong interaction) and $Nb_2CI_{11}^--EMI^+$ were obtained with the HF/LANL2DZ level of calculation. The harmonic frequencies at each equilibrium structure were compared with Raman spectra. The harmonic frequencies of $NbCI_6^--EMI^+,\; Nb_2CI_{11}^--EMI^+,\;and\;Nb_2CI_{10}$ were in good agreement with the Raman spectra of RTMS melts. In the $NbCI_5-EMIC RTMS$, the main species were $NbCI_6^-\;and\;EMI^+$. In the $NbCl_5-EMIC$ RTMS added $NbCl_5\;over\;50mol\%$, small amount of $Nb_2CI_{11}^-\;and\; Nb_2CI_{10}$ were also formed. The structures of anions and cation in the RTMS distorted from free ions with Coulomb force.
A Perspective of Reconfigurable RF Circuits
Kenichi Okada,Akira Matsuzawa 에스케이텔레콤 (주) 2010 Telecommunications Review Vol.20 No.5
Electronic devices have become mature and been diversified, and flexibility is becoming increasingly important in integrated circuits. Circuits have obtained flexibility and reconfigurability at various levels due to digitization, i.e. simplification, but real-world interfaces such as external communications and sensors intrinsically require analog circuits rather than digital. Digital signals can be processed by PCs, DSPs, FPGAs, custom LSIs, and other digital circuits. In analog circuits, however, general-purpose products offer only a limited and fixed range of functions. The development of reconfigurable analog RF circuits will provide a means of breaking through this impasse and realize both flexibility and high performance. Here we provide a forward-looking perspective on reconfigurable analog RF circuit technology; in particular it s present and future key components, and describes the pathway for innovation and change.