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Yoshinori Ishigami,Tetsuya Etoh,Keiki Morimoto,Sang Hwa Jung,Eiji Hiraki,Hyun Woo Lee,Manabu Ishitobi,Mutsuo Nakaoka 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
In the semiconductor manufacturing technology as the plasma etching processing, Voltage fed-D class in-series resonant high frequency power amplifier using power MOSFET, which operates under a condition of discontinuous resonant current based soft switching, for plasma generating is introduced. This paper presents some practical and theoretical evaluation of voltage source class D phase-shifted ZVS-PWM DC-DC power converter with a high frequency<br/> transformer link and capacitor input type DC smoothing filter,<br/> which is designed for 50 KHz, by using IGBT power modulation. Its operating principle in a steady-state is described by using equivalent circuits, along with the experimental operation waveforms. The soft switching operating range for phase-shifted duty factor is illustrated and discussed by using a criteria value due to residual voltage across the lossless snubbing capacitors. The output power regulation vs phase shifted duty factor characteristics of this power converter are evaluated under a condition of ZVS commutation.<br/> Index Terms<br/> Voltage source-fed DC-DC power converter, Lossless capacitive snubbers, Phase shifted PWM, Zero voltage soft switching, High frequency transformer link, Capacitive input DC smoothing filter, Circuit soft switching operation limitation, Plasma processing applications
Koura, Nobuyuki,Minami, Takuto,Etoh, Keiko,Idemoto, Yasushi,Matsumoto, Futoshi The Korean Electrochemical Society 2002 한국전기화학회지 Vol.5 No.4
The electrochemical behavior of binder-free carbon anode, comprising of only artificial and natural graphite (AG and NG) particles, for intercalation and deintercalation of lithium ion $(Li^+)$ in aluminum chloride (AICI_3)-I-ethyl3-methylimidazolium chloride (EMIC)-lithium chloride (LiCl)-thionyl chloride $(SOCI_2)$ room-temperature molten salt (RTMS) was studied. Binder-free carbon electrodes were fabricated using electrophoretic deposition (EPD) method. The binder-free carbon anodes provided a relatively flat charge and discharge potentials $(0\;to\;0.2V\;vs.\;Li/Li^+)$ and current capabilities $(250-340mAh{\cdot}g^{-1})$ for the intercalation and deintercalation of $Li^+$. Stability of the binder-free carbon anodes for intercalation and deintercalation of 50 cycles was confirmed.
Flavonoids and Stilbenes as Repellents against the Blue Mussel, Mytilus edulis galloprovincialis
Singh, Inder Pal,Etoh, Hideo,Asai, Eiko,Kikuchi, Kojiro,Ina, Kazuo,Koyasu, Katsuya,Terada, Yukimasa The Korean Society of Pharmacognosy 1997 Natural Product Sciences Vol.3 No.1
We studied the attachment-repelling activity of flavonoids, stilbenes, and their glycosides against the blue mussel Mytilus edulis galloprouincialis. Molecular mechanics calculations have shown that the most stable conformations of potent repellents 29 and 32 were the same. On the basis of these results, structure-activity relationships of these compounds are discussed.
Biological Activities of Phloroglucinol Derivatives from Eucalyptus Spp.
Singh, Inder Pal,Etoh, Hideo The Korean Society of Pharmacognosy 1997 Natural Product Sciences Vol.3 No.1
Eucalyptus is a rich source of biologically active compounds. Among these, phloroglucinol compounds such as sideroxylonals, macrocarpals, euglobals, and robustadials are unique to Eucalyptus species. Sideroxylonal A is a very potent attachment-inhibitor. Macrocarpals show very strong antibacterial activity against gram positive bacteria. Macrocarpals also show HIV-RTase inhibitory activity. Euglobals are potent inhibitors of Epstein-Barr virus activation and are developed as skin and antitumor agents. They also show granulation inhibitory activity. In this review we aim to remove the existing confusion in literature on macrocarpals and discuss the biological activities and structure-activity relationships of phloroglucinol compounds.
Numerical simulation of columns with un-bonded reinforcing bars for crack control
G. Chen,H. Fukuyama,M. Teshigawara,H. Etoh,K. Kusunoki,H. Suwada 국제구조공학회 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.26 No.4
Following previous work carried out in Building Research Institute in Japan, finite element analyses of conceptual column designs are performed in this paper. The effectiveness of the numerical model is evaluated by experimental tests and parametric studies are conducted to determine influential factors in conceptual column designs. First, three different column designs are analysed: bonded, unbonded, and un-bonded with additional reinforcing bars. The load-displacement curves and cracking patterns in concrete are obtained and compared with experimental ones. The comparisons indicate that the finite element model is able to reflect the experimental results closely. Both numerical and experimental results show that, the introduction of un-bonded zones in a column end can reduce cracking strains, accordingly reduce the stiffness and strength as well; the addition of extra reinforcement in the un-bonded zones can offset the losses of the stiffness and strength. To decide the proper length of the un-bonded zones and the sufficient amount of the additional reinforcing bars, parametric studies are carried out on their influences. It has been found that the stiffness of un-bonded designs slightly decreases with increasing the length of the un-bonded zones and increases with the size of the additional reinforcing bars.