Energy efficient wireless random access network with code-based multilevel modulation scheme Nobuyoshi Komuro, Hiroo Sekiya and Shiro Sakata Journal of Signal Processing, vol.15, no.6, pp.461-468, Nov. 2011. [Abstract | pdf] Design of class-E amplifier with MOSFET linear gate-to-drain and nonlinear drain-to-source capacitances Xiuqin Wei, Hiroo Sekiya, Shingo Kuroiwa, Tadashi Suetsugu, and Marian K. Kazimierczuk IEEE Transactions on Circuits and Systems Part I: Regular Papers, vol.58, no.10, pp.2556-2565, Oct. 2011. [Abstract | pdf] Analytical expression of maximum throughput for long-frame communications in one-way string wireless multihop networks Hiroo Sekiya, Yoshihiro Tsuchiya, Nobuyoshi Komuro, and Shiro Sakata Wireless Personal Communications, vol.60, no.1, pp.29-41, Sept. 2011. [Abstract | pdf] Analytical expressions for RTS/CTS wireless multihop networks Sze Yih Chin, Nobuyoshi Komuro, Hiroo Sekiya and Shiro Sakata Journal of Signal Prosessing, vol.15, no.4, pp.267-271, July 2011. [Abstract | pdf]

Design of symmetric class-E_M power amplifier Xiuqin Wei, Tomoharu Nagashima, Shingo Kuroiwa, Hiroo Sekiya 37th Annual Conference on IEEE Industrial Electronics Society (IECON2011) , pp.1300-1305 , Nov. 2011. [Abstract | pdf] Fundamental study on drain efficiency of EDSM/EPWM transmitter using class-EM amplifier Makoto Taromaru, Naoki Oyama, Hiroo Sekiya, and Tadashi Suetsugu Proc. 2011 Korea-Japan Microwave Conf. (KJMW 2011), pp.134-137, Nov. 2011. [Abstract | pdf] A numerical determination of the grazing bifurcation thresholds in an impact oscillator with fixed border Akiko Takahashi, Hiroo Sekiya, Kazuyuki Aihara, and Takuji Kousaka 2011 International Symposium on Nonlinear Theory and Its Appilcations (NOLTA2011), pp.570-573, Sept. 2011. [Abstract | pdf] Design of class-DE power amplifier including optimal design of resonant inductor Hiroo Sekiya, Natsumi Sagawa, Yuzhen Li, and Marian K. Kazimierczuk Electrical Manufacturing Coil Winding & Coating Expo (EMCW2011), Sept. 2011. [Abstract | pdf] The dynamic behavior of the class-E_M amplifier outside of nominal conditions Ryuta Nakamura, Hiroo Sekiya, and Takuji Kousaka International Workshop on Nonlinear Maps and their Applications (NOMA2011), pp.38-40, Sept. 2011. [Abstract | pdf] Acceleration of PSO for designing class E amplifier Yuichi Tanji, Haruna Matsushita, and Hiroo Sekiya 2011 International Symposium on Nonlinear Theory and Its Appilcations (NOLTA2011), pp.492-495, Sept. 2011. [Abstract | pdf] Coupling effect in IEEE 802.11 DCF wireless multi-hop networks Kosuke Sanada, Hiroo Sekiya, Nobuyoshi Komuroy and Shiro Sakata 2011 International Symposium on Nonlinear Theory and its Applications (NOLTA2011), pp.248-251, Sept. 2011. [Abstract | pdf] Power conversion efficiency of class-E power amplifier outside nominal operation Tomoharu Nagashima, Xiuqin Wei, Hiroo Sekiya, and Marian K. Kazimierczuk 2011 IEEE International Symposium on Circuits and Systems (ISCAS2011) , pp.749-752, May 2011. [Abstract | pdf] Energy efficiency of code multi-level modulation-used wireless random access network Nobuyoshi Komuro, Hiroo Sekiya and Shiro Sakata 2011 International Workshop on Nonlinear Circuits, Communication and Signal Processing (NCSP2011), pp.215-218, Mar. 2011. [Abstract | pdf] Analytical expressions for RTS/CTS-used wireless multihop networks Sze Yih Chin, Nobuyoshi Komuro, Hiroo Sekiya and Shiro Sakata 2011 International Workshop on Nonlinear Circuits, Communication and Signal Processing (NCSP2011), pp.223-226, Mar. 2011. [Abstract | pdf]

An effective method for calculating the grazing bifurcation points in an impact oscillator (in Japanese) Yusho Shimizu, Hiroo Sekiya, Kazuyuki Aihara, and Takuji Kousaka IEICE Technical Committee on Nonlinear Problems, vol.111, no.339, pp.31-34, Dec. 2011. [Abstract | pdf] Analysis for wireless ad-hoc networks with frame drop (in Japanese) Kosuke Sanada, Hiroo Sekiya, Nobuyoshi Komuro, and Shiro Sakata IEICE Technical Committee on Network Systems,, vol.111, no.8, pp.13-18, Dec. 2011. [Abstract | pdf] A calculation method of grazing bifurcation point for period-1 orbit in an impact oscillator with periodically moving borders (in Japanese) Akiko Takahashi, Hiroo Sekiya, Kazuyuki Aihara, and Takuji Kousaka IEICE Technical Committee on Nonlinear Problems, vol.111, no.276, pp.29-32, Nov. 2011. [Abstract | pdf] Analytical derivation of switching-pattern distribution for class-E amplier using bifurcation theory (in Japanese) Tomoharu Nagashima, Xiuqin Wei, Takuji Kousaka, and Hiroo Sekiya IEICE Technical Committee on Nonlinear Problems, vol.111, no.276, pp.49-54, Nov. 2011. [Abstract | pdf] Push-Pull Class-EM Power Amplifier Xiuqin Wei, Hiroo Sekiya, and Shingo Kuroiwa The 24th Workshop on Circuits and Systems, pp.254 - 259, Aug. 2011. [Abstract | pdf] Operation of class-E amplifier outside nominal conditions (in Japanese) Tomoharu Nagashima and Hiroo Sekiya The 24th Workshop on Circuits and Systems, pp.242 - 247, Aug. 2011. [Abstract | pdf] Fundamental study on drain efficiency of EPWM transmitter using class-EM Power amplifier (in Japanese) Naoki Oyama, Hiroo Sekiya, Makoto Taromaru, and Tadashi Suetsugu IEICE Technical Committee on Radio Communication Systems, vol.111, no.145, pp.157-162, July 2011. [Abstract | pdf] Dynamic behavior of the class-EM amplifier with one input signal (in Japanese) Ryuta Nakamura, Hiroo Sekiya, Takuji Kousak IEICE Technical Committee on Nonlinear Problems, vol.111, no.106, pp.161-164, July 2011. [Abstract | pdf] Symmetrical class-E_M power amplier for very low harmonic-content applications (in Japanese) Xiuqin Wei, Tomoharu Nagashima, Shingo Kuroiwa, and Hiroo Sekiya IEICE Technical Committee on Nonlinear Problems, vol.111, no.106, pp.165-170, June 2011. [Abstract | pdf] Power conversion efficiency of class-E power amplifier outside nominal operation (in Japanese) Tomoharu Nagashima, Xiuqin Wei, and Hiroo Sekiya IEICE Technical Committee on Nonlinear Problems, vol.111, no.106, pp.171-175, June 2011. [Abstract | pdf] Analysis for wireless ad-hoc networks with frame drop (in Japanese) Kosuke Sanada, Hiroo Sekiya, Nobuyoshi Komuro, and Shiro Sakata IEICE Technical Committee on Nonlinear Problems, vol.111, no.106, pp.35-40, June 2011. [Abstract | pdf] Coupling effect in IEEE 802.11 DCF wireless multi-hop network (in Japanese) Kosuke Sanada, Hiroo Sekiya, Nobuyoshi Komuro, and Shiro Sakata IEICE Technical Committee on Network Systems, vol.111, no.8, pp.49-54, Apr. 2011. [Abstract | pdf]