Locking range derivations for injection-locked class-E oscillator applying phase reduction theory Tomoharu Nagashima, Xiuqin Wei, Hisa-Aki Tanaka, and Hiroo Sekiya IEEE Transactions on Circuits and Systems Part I: Regular Papers, vol.61, no.10, pp.2904-2911, Oct. 2014. [Abstract | pdf] Analysis, Design and Implementation of Class-E ZVS Power Amplifier with MOSFET Nonlinear Drain-to-Source Parasitic Capacitance at Any Grading Coefficient Mohsen Hayati, Ali Lotfi, Marian K. Kazimierczuk, and Hiroo Sekiya IEEE Transactions on Power Electronics, vol.29, no.9, pp.4989-4999, Sept. 2014. [Abstract | pdf] Waveform equations, output power, and power conversion efficiency for class-E inverter outside nominal operation Tomoharu Nagashima, Xiuqin Wei, Tadashi Suetsugu, Marian K. Kazimierczuk, and Hiroo Sekiya IEEE Transactions on Industrial Electronics, vol.61, no.4, pp.1799-1810, Apr. 2014. [Abstract | pdf] Modeling and analysis of class-E amplifier with a shunt inductor at sub-nominal operation for any duty ratio Mohsen Hayati, Ali Lotfi, Marian K. Kazimierczuk, and Hiroo Sekiya IEEE Transactions on Circuits and Systems Part I: Regular Papers, vol.61, no.4, pp.987-1000, Apr. 2014. [Abstract | pdf] Analysis and design of class-E_M power amplifier Xiuqin Wei, Tomoharu Nagashima, Marian K. Kazimierczuk, Hiroo Sekiya, and Tadashi Suetsugu IEEE Transactions on Circuits and Systems Part I: Regular Papers, vol.61, no.4, pp.976-986, Apr. 2014. [Abstract | pdf] A Control-channel Type Multi-channel MAC Protocol Applying Pulse/Tone Ex- change in Ad-hoc Network (in Japanese) Ryo MANZOKU, Hiroo SEKIYA, Jing MA, Kosuke SANADA, and Shiro SAKATA IEICE Transactions on Communications, vol.J97-B, no.4, pp.344-353, Apr. 2014. [Abstract | pdf]

[Invited Talk] Analytical design procedure for resonant inductively coupled class-E^2 wireless power transfer system Tomoharu Nagashima, Xiuqin Wei, and Hiroo Sekiya 2014 IEEE Workshop on Nonlinear Circuit Networks (NCN2014), Dec. 2014. [Abstract | pdf] Numerical algorithm for distribution-map derivations of switching converters Yuta Yamada, Tomoharu Nagashima, Yoshifumi Ibuki, Yoshiki Fukumoto, and Hiroo Sekiya The 40th Annual Conference of the IEEE Industrial Electronics Society (IECON 2014), pp.4338-4344, Nov. 2014. [Abstract | pdf] Analytical design procedure for resonant inductively coupled wireless power transfer system with class-DE inverter and class-E rectifier Tomoharu Nagashima, Xiuqin Wei, and Hiroo Sekiya 2014 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS2014),, pp.288-291, Nov. 2014. [Abstract | pdf] A loosely coupled inductive wireless power transfer systems with class-E transmitter and multiple receivers Hiroo Sekiya, Kazuhide Inoue, Tomoharu Nagashima, Tadashi Suetsugu, Shotaro Kuga, Xiuqin Wei, Kenichi Shirota, Hironobu Hatamoto, and Satoru Shimizu 2014 IEEE Energy Conversion Congress and Exposition (ECCE2014), pp.675-680, Sept. 2014. [Abstract | pdf] Operation of class-E^2 DC-DC converter outside nominal conditions Tomoharu Nagashima, Xiuqin Wei, and Hiroo Sekiya 2014 International Symposium on Nonlinear Theory and its Applications (NOLTA2014), pp.478 - 481, Sept. 2014. [Abstract | pdf] Analytical design procedure for resonant inductively coupled wireless power transfer with class-E^2 DC-DC converter Tomoharu Nagashima, Kazuhide Inoue, Xiuqin Wei, Elisenda Bou, Eduard Alarcon, Marian K. Kazimierczuk, and Hiroo Sekiya 2014 IEEE International Symposium on Circuits and Systems (ISCAS2014), pp.113-116, June 2014. [Abstract | pdf] Multiphase resonant inverters with common resonant circuit Mariusz Bojarski, Dariusz Czarkowski, Francisco de Leon, Qijun Deng, Marian K. Kazimierczuk, and Hiroo Sekiya 2014 IEEE International Symposium on Circuits and Systems (ISCAS2014), pp.2445-2448, June 2014. [Abstract | pdf] Maximum throughput analysis for IEEE 802.11 string topology wireless multi-hop networks taking into account hidden nodes using Markov-chain model Kosuke Sanada, Hiroo Sekiya, Nobuyoshi Komuro, and Shiro Sakata 2014 International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'14), pp.77-80, Mar. 2014. [Abstract | pdf] Class E^2 resonant non-radiative wireless power transfer link: a design-oriented joint circuit-system co-characterization approach Elisenda Bou,Tomoharu Nagashima, Hiroo Sekiya, and Eduard Alarcon 2014 IEEE International Multi-Conference on Systems, Signals and Devices (SSD2014), pp.1-4, Feb. 2014. [Abstract | pdf]

Analytical design of resonant inductively coupled wireless power transfer system with class-E2 DC-DC converter Tomoharu Nagashima, Xiuqin Wei, and Hiroo Sekiya The 1st Symposium on Semiconductor Power Conversion (S2PC), Oct. 2014. [Abstract | pdf] A loosely coupled wireless power transfer system with class-DE transmitter and multiple receivers Kazuhide Inoue, Tomoharu Nagashima, and Hiroo Sekiya The 1st Symposium on Semiconductor Power Conversion (S2PC), Oct. 2014. [Abstract | pdf] Analytical expressions of end-to-end throughput for IEEE 802.11e EDCA wireless multi-hop networks Yuta Shimoyamada, Kosuke Sanada, Nobuyoshi Komuro, and Hiroo Sekiya 3rd Japan-Korea Joint Workshop on Complex Communication Sciences (JKCCS' 14), Oct. 2014. [Abstract | pdf] Prolonging network lifetime for 6LoWPAN/RPL wireless sensor network using mobile sink with dynamic sojourn time Shun Wakatsuki, Nobuyoshi Komuro, Hiroo Sekiya, and Shiro Sakata 3rd Japan-Korea Joint Workshop on Complex Communication Sciences (JKCCS' 14), Oct. 2014. [Abstract | pdf] Analytical expression for throughput and transmission delay of IEEE 802.11 string topology networks with two-way flows Kosuke Sanada, Yuta Shimoyamada, Yuji Ikeda, Nobuyoshi Komuro, and Hiroo Sekiya 3rd Japan-Korea Joint Workshop on Complex Communication Sciences (JKCCS' 14), Oct. 2014. [Abstract | pdf] Optimal power flow problem with considering CO2 emission in power system Kazuhiro Okabe, Hiroaki Kurokawa, and Hiroo Sekiya 3rd Japan-Korea Joint Workshop on Complex Communication Sciences (JKCCS' 14), Oct. 2014. [Abstract | pdf] Steady-state analysis of class-E^2 DC-DC converter outside nominal condition (in Japanese) Tomoharu Nagashima, Xiuqin Wei, and Hiroo Sekiya The 27th WorkShop on Circuits and Systems, pp.7-12, Aug. 2014. [Abstract | pdf] Generalized analytical expressions for throughput and transmission delay of IEEE 802.11 string topology networks (in Japanese) Kosuke Sanada, Yuta Shimoyamada, Yuji Ikeda, Hiroo Sekiya,and Nobuyoshi Komuro IEICE Technical Committee on Network Systems, vol.114, no.163, pp.155-160, July 2014. [Abstract | pdf] Route construction for 6LoWPAN/RPL wireless sensor network using multiple sinks (in Japanese) Shun Wakatsuki, Nobuyoshi Komuro, and Hiroo Sekiya IEICE Technical Committee on Ambient Intelligence and Sensor Networks, vol.114, no.166, pp.37-42, July 2014. [Abstract | pdf] MOSFET nonlinear capacitance effect on EER transmitter with class-E amplifier (in Japanese) Xiuqin Wei, Tomoharu Nagashima, Hiroo Sekiya, and Tadashi Suetsugu IEICE Technical Committee on Nonlinear Problems, pp.63-67, May 2014. [Abstract | pdf] Analytical design for resonant inductively coupled wireless power transfer with class-E^2 DC-DC converter (in Japanese) Tomoharu Nagashima, Kazuhide Inoue, Xiuqin Wei, and Hiroo Sekiya IEICE Technical Committee on Wireless Power Transmission, pp.23-27, Jan. 2014. [Abstract | pdf] Throughput analysis for IEEE 802.11e multi-hop networks in the presence of hidden nodes taking into account backoff-based priority differentiation  (in Japanese) Yuta Shimoyamada, Kosuke Sanada, Hiroo Sekiya, Nobuyoshi Komuro, and Shiro Sakata IEICE Technical Committee on Ambient Intelligence and Sensor Networks, vol.113, no.399, pp.169-174, Jan. 2014. [Abstract | pdf] Logical-topology-construction method based on small world concepts for wireless sensor networks (in Japanese) Sho Motegi, Hiroo Sekiya, Nobuyoshi Komuro, Shiro Sakata IEICE Technical Committee on Ambient Intelligence and Sensor Networks, vol.113, no.399, pp.175-178, Jan. 2014. [Abstract | pdf]