MAC protocol for ad hoc networks using smart antennas for mitigating hidden and deafness problems Jing Ma, Hiroo Sekiya, Atsushi Nagasaki, Nobuyoshi Komuro, Shiro Sakata IEICE Transactions on Communications, vol.E95-B, no.11, pp.3545-3555, Nov. 2012. [Abstract | pdf] Particle swarm optimization for design of class-E amplifier Yuichi Tanji, Haruna Matsushita, and Hiroo Sekiya Nonlinear Theory and Its Applications, IEICE Journal, vol.3, no.4, pp.586-595, Oct. 2012. [Abstract | pdf] Design of class-E_M oscillator with second harmonic injection Ryosuke Miyahara, Xiuqin Wei, Tomoharu Nagashima, Takuji Kousaka, and Hiroo Sekiya IEEE Transactions on Circuits and Systems Part I: Regular Papers, vol.59, no.10, pp.2456-2467, Oct. 2012. [Abstract | pdf] Push-pull class-E_M power amplifier for low harmonic-contents and high output-power applications Xiuqin Wei, Shingo Kuroiwa, Tomoharu Nagashima, Marian K. Kazimierczuk, and Hiroo Sekiya IEEE Transactions on Circuits and Systems Part I: Regular Papers, vol.59, no.9, pp.2137-2146 , Sept. 2012. [Abstract | pdf] Steady-state behavior of class-E amplifier outside nominal operation taking into account MOSFET-body-diode effect Tomoharu Nagashima and Hiroo Sekiya Journal of Signal Prosessing, vol.16, no.4, July 2012. [Abstract | pdf] Bifurcation analysis of the class-E inverter for switching-pattern derivations Tomoharu Nagashima, XiuqinWei, Takuji Kousaka, and Hiroo Sekiya IEICE Communications Express (ComEx), vol.1, no.1, pp.33-39, June 2012. [Abstract | pdf] MAC protocol for smart-antenna used ad hoc networks with RTS/CTS overhead reduction Jing Ma, Hiroo Sekiya, Nobuyoshi Komuro, and Shiro Sakata Journal of Selected Areas in telecommunications (JSAT), pp.10-19, June 2012. [Abstract | pdf] Backoff-stage synchronization in three-hop string-topology wireless networks with hidden nodes Kosuke Sanada, Hiroo Sekiya, Nobuyoshi Komuro, and Shiro Sakata Nonlinear Theory and Its Applications, IEICE, vol.3, no.2, pp.200-214, Apr. 2012. [Abstract | pdf] Token generation rate based receiving opportunity control for QoS guarantee considering priority flows in wireless multi-hop network (in Japanese) Takuma Takase, Nobuyoshi Komuro, Shiro Sakata, Shigeo Shioda, Ttumu Murase, and Hiroo Sekiya IEICE Transactions on Communications, vol.J95-B, no.2, pp.188-198, Feb. 2012. [Abstract | pdf] Feature optimization approach for improving the collaborative filtering performance using particle swarm optimization Amira Abdelwahab, Hiroo Sekiya, Ikuo Matsuba, Yasuo Horiuchi, Shingo Kuroiwa Journal of Computational Information Systems, vol.8, no.1, p.435–450, Jan. 2012. [Abstract | pdf] Alleviating the sparsity problem of collaborative filtering using an efficient iterative clustered prediction technique Amira Abdelwahab, Hiroo Sekiya, Ikuo Matsuba, Yasuo Horiuchi, and Shingo Kuroiwa International Journal of Information Technology and Decision Making (IJITDM), vol.11, no.1, pp.33-53, Jan. 2012. [Abstract | pdf]

Inductively coupled wireless power transfer with class-DE power amplifier Tomoharu Nagashima, Xiuqin Wei, Tadashi Suetsugu, and Hiroo Sekiya 2012 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS2012), , pp.73-76, Dec. 2012. [Abstract | pdf] An asynchronous multi-channel MAC protocol with Pulse/Tone exchange for RTS collision avoidance Ryo Manzoku, Hiroo Sekiya, Jing Ma, Kosuke Sanada and Shiro Sakata 1st IEEE International Symposium on Telecommunication Technologies (ISTT2012), pp.76-81, Nov. 2012. [Abstract | pdf] Analytical derivation of switching-pattern distribution for class-E amplifier using bifurcation theory Tomoharu Nagashima , Xiuqin Wei, Takuji Kousaka, and Hiroo Sekiya 2012 International Symposium on Nonlinear Theory and its Applications (NOLTA2012), pp.687-690, Oct. 2012. [Abstract | pdf] Bifurcation in injection-locked class-EM oscillator Ryuta Nakamura, XiuqinWei, Takuji Kousaka, and Hiroo Sekiya 2012 International Symposium on Nonlinear Theory and its Applications (NOLTA2012), pp.691-694, Oct. 2012. [Abstract | pdf] Influence of nonlinear shunt capacitance in harmonic distortion in output envelope of drain voltage modulated Class E amplifier Tadashi Suetsugu, Hiroo Sekiya, and Xiuquin Wei 2012 International Symposium on Nonlinear Theory and its Applications (NOLTA2012), pp.614-617, Oct. 2012. [Abstract | pdf] A directional MAC protocol with the DATA-frame fragmentation and short busy advertisement signal for mitigating the directional hidden node problem Sho Motegi, Hiroo Sekiya, Jing Ma, Kosuke Sanada and Shiro Sakata 2012 IEEE 23rd International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC2012), pp.409-414, Sept. 2012. [Abstract | pdf] A numerical approach to calculate grazing bifurcation points in an impact oscillator with periodic boundaries Akiko Takahashi, Hiroo Sekiya, Kazuyuki Aihara and Takuji Kousaka 2012 IEEE International Symposium on Circuits and Systems (ISCAS2012), pp.2011-2014, May 2012. [Abstract | pdf] Improvement of the calculation method for the grazing bifurcation point in two-dimensional impact oscillator Yusho Shimizu, Hiroo Sekiya, Kazuyuki Aihara, and Takuji Kousaka 2012 RISP International Workshop on Nonlinear Circuits, Communications, and Signal Processing (NCSP2012), pp.5-8, Mar. 2012. [Abstract | pdf] Approximate analysis for class-EM amplifier taking into account harmonic frequency components Taro Kakimoto, Tomoharu Nagashima, Xiuqin Wei and Hiroo Sekiya 2012 International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2012), pp.154-157, Mar. 2012. [Abstract | pdf] An enhanced PSO algorithm for designing class E amplifier Yuichi Tanji, Haruna Matsushita, and Hiroo Sekiya 2012 RISP International Workshop on Nonlinear Circuits, Communications, and Signal Processing (NCSP2012), pp.146-149, Mar. 2012. [Abstract | pdf] Analytical method of maximum UDP throughput for one-way wireless multi-Hop networks using Markov Chain model Kosuke Sanada, Hiroo Sekiya, Nobuyoshi Komuro and Shiro Sakata 2012 International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2012), pp.125-128, Mar. 2012. [Abstract | pdf]

A directional MAC protocol with the DATA-frame Fragmentation and short busy advertisement signal for mitigating the directional hidden node problem (in Japanese) Sho Motegi, Hiroo Sekiya, Jing Ma, Kosuke Sanada, and Shiro Sakata IEICE Technical Committee on Radio Communication Systems, vol.112, no.351, pp.59-64, Dec. 2012. [Abstract | pdf] A multi-channel MAC protocol with pulse/Tone exchange for RTS collision avoidance (in Japanese) Ryo Manzoku, Hiroo Sekiya, Jing Ma, Kosuke Sanada, and Shiro Sakata IEICE Technical Committee on Radio Communication Systems, vol.112, no.351, pp.65-69, Dec. 2012. [Abstract | pdf] Non-saturated and Maximum Throughput Analysis for String Topology Wireless multi-hop Networks (in Japanese) Kosuke Sanada, Hiroo Sekiya, and Shiro Sakata IEICE Technical Committee on Network Systems, vol.112, no.350, pp.91-95, Dec. 2012. [Abstract | pdf] Resonant class E rectifier for wireless power transfer in contactless IC card reader/writer Tadashi Suetsugu, Xiuqin Wei, Kazunari Shimazaki, Tomoharu Nagashima, and Hiroo Sekiya 2012 Korea-Japan Joint Technical Workshop on Semiconductor Power Converter, pp.58-61, Nov. 2012. [Abstract | pdf] Comparisons of RF choke inductor designs by area product and core geometry Hiroo Sekiya 2012 Korea-Japan Joint Technical Workshop on Semiconductor Power Converter, pp.45-49, Nov. 2012. [Abstract | pdf] Non-saturated and maximum throughput analysis for string topology wireless multi-hop networks Kosuke Sanada, Hiroo Sekiya, and Shiro Sakata IEICE Technical Committee on Complex Communication Science, Korea Japan Joint Workshop, Nov. 2012. [Abstract | pdf] Back-off stage synchronization in the wireless multi-hop networks and the discussion (in Japanese) Kosuke Sanada, Hiroo Sekiya, Nobuyoshi Komuro, and Shiro Sakata IEICE Technical Committee on Complex Communication Sciences, vol.CCS-2012-006, pp.29-35, Aug. 2012. [Abstract | pdf] MAC protocol for smart-antenna-used ad hoc network without RTS/CTS handshake by using pulse/tone exchange (in Japanese) Jing MA, Hiroo SEKIYA, Nobuyoshi KOMURO, and Shiro SAKATA IEICE Technical Committee on Ad Hoc Networks, vol.112, no.122, pp.7-12, July 2012. [Abstract | pdf] Analytical derivation of power conversion efficiency for class-E amplifier with any Q (in Japanese) Tomoharu Nagashima, Xiuqin Wei, Takuji Kousaka, and Hiroo Sekiya IEICE Technical Committee on Nonlinear Problems, vol.112, no.6, pp.115-120, Apr. 2012. [Abstract | pdf] Token generation rate based receiving opportunity control for QoS guarantee considering priority flows in wireless multi-hop network (in Japanese) Takuma Takase, Nobuyoshi Komuro, Shiro Sakata, Hiroo Sekiya, Shigeo Shioda, and Tsutomu Murase IEICE Technical Committee on Information Networks, vol.111, no.469, pp.25-30, Mar. 2012. [Abstract | pdf] Receiving-opportunity control-employed QoS guarantee scheme in WLAN with DCF and IEEE 802.11e terminals (in Japanese) Kosuke Watanabe, Nobuyoshi Komuro, Shiro Sakata, Hiroo Sekiya, Shigeo Shioda, and Tsutomu Murase IEICE Technical Committee on Information Networks, vol.111, no.469, pp.293-298, Mar. 2012. [Abstract | pdf]