研究者詳細 - 五百旗頭　健吾

MISC - 五百旗頭　健吾

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ツイストペアケーブルからの不要電磁波放射のメカニズム解明

五十嵐俊, 宮脇大輔, 山岸傑, 桑山一郎, 五百旗頭健吾, 豊田啓孝

住友電工テクニカルレビュー(Web) ( 204 ) 2024年

平衡度不整合モデルによる金属筐体に近接した通信系のコモンモード放射シミュレーション招待

五百旗頭健吾, 豊田啓孝

エレクトロニクス実装学会誌 25 ( 5 ) 439 - 445 2022年8月

岡山大学大学院自然科学研究科産業創成工学専攻光電磁波工学研究室招待

五百旗頭健吾

エレクトロニクス実装学会誌 25 ( 4 ) 327 - 327 2022年7月

コモンモードシミュレーションを用いたEMC設計のための支配的なノイズ源の特定—Identification of Dominant Noise Sources of Radiated Disturbance for EMC Design Using Common-mode Simulation

辻本隆浩, 髙津宏明, 野村毅, 五百旗頭健吾, 川島渉, 豊田啓孝

Konica Minolta technology report 19 57 - 62 2022年1月

Modifying Noise Source Amplitude Modulation Technique to Estimate Magnitude and Phase of Emissions from Individual Integrated Circuits 査読国際誌

Kengo Iokibe, Shimpei Yoshino, Yusuke Yano, and Yoshitaka Toyota

2019 International Symposium on Electromagnetic Compatibility (EMC Europe 2019) 774 - 777 2019年9月

Experimental Identification of Relationship between Leakage Trace SNR and Correlation Coefficient in Differential Power Analysis 査読国際誌

Yusuke Yano, Toshiaki Teshima, Kengo Iokibe, and Yoshitaka Toyota

2019 Joint International Symposium on Electromagnetic Compatibility and Asia-Pacific International Symposium on Electromagnetic Compatibility, Sapporo(EMC Sapporo & APEMC 2019), FriAM1C.4 797 - 800 2019年6月

Determination of Dominant ICs for Electromagnetic Emission by Using Noise Source Amplitude Modulation and Correlation Analysis 査読

Shimpei Yoshino, Chiaki Ishida, Kengo Iokibe, Yoshitaka Toyota, Yasuyuki Nogami

2018 International Symposium on Electromagnetic Compatibility (EMC Europe 2018) 439 - 444 2018年8月

Determination of Dominant ICs for Electromagnetic Emission by Using Noise Source Amplitude Modulation and Correlation Analysis 査読

Shimpei Yoshino, Chiaki Ishida, Kengo Iokibe, Yoshitaka Toyota, Yasuyuki Nogami

2018 International Symposium on Electromagnetic Compatibility (EMC Europe 2018) 439 - 444 2018年8月

Extension of signal-to-noise ratio measurement method to byte-by-byte side-channel attack 査読国際誌

Kengo Iokibe, Toshiaki Teshima, Yusuke Yano, Yoshitaka Toyota

2018 IEEE International Symposium on Electromagnetic Compatibility and 2018 Asia-Pacific Symposium on Electromagnetic Compatibility (EMC/APEMC), WE-PM-SS-09-3 745 - 748 2018年5月

Application of PRBS for dominant source identification electromagnetic interference caused by digital integrated circuits 査読

Chiaki Ishida, Kengo Iokibe, Yoshitaka Toyota

2017 IEEE International Conference on Consumer Electronics - Taiwan, ICCE-TW 2017 245 - 246 2017年7月

担当区分：責任著者記述言語：英語掲載種別：記事・総説・解説・論説等（国際会議プロシーディングズ）出版者・発行元：Institute of Electrical and Electronics Engineers Inc.

Pseudo-random binary sequence (PRBS) was applied to identify dominant noise sources of electromagnetic interference (EMI) radiated from a printed circuit board (PCB) including line driver ICs. The ICs were controlled in activation of output according to a set of PRBSs that varied amplitude of switching current generated in the ICs and also changes the strength of EMI. Correlation coefficients between the temporal variation of conducted EMI strength and PRBS were examined. Results showed that PRBS has a potential to identify dominant noise sources of EMI.

DOI： 10.1109/ICCE-China.2017.7991087

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Miniaturization of planar EBG structure using dual power planes 査読

Xingxiaoyu Lin, Yoshitaka Toyota, Kengo Iokibe, Toshiyuki Kaneko

2017 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2017 241 - 243 2017年7月

記述言語：英語掲載種別：記事・総説・解説・論説等（国際会議プロシーディングズ）出版者・発行元：Institute of Electrical and Electronics Engineers Inc.

The miniaturization of unit cells in planar electromagnetic bandgap (EBG) structures has been difficult because the stopband frequency depends on the unit-cell size. To solve this problem, we developed an EBG structure that uses two power planes (dual power plane: DPP) with the addition of a capacitive coupling element. This enables us to easily enlarge the capacitance formed in the unit cell and achieve miniaturization with a stopband frequency of interest. Using full-wave simulation, we tested a 2-mm-square (4-mm2) unit cell of the DPP-EBG structure and measured a stopband frequency around 2.4 GHz.

DOI： 10.1109/APEMC.2017.7975472

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Signal-to-noise ratio measurements of side-channel traces for establishing low-cost countermeasure design 査読

Yusuke Yano, Kengo Iokibe, Yoshitaka Toyota, Toshiaki Teshima

2017 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2017 93 - 95 2017年7月

記述言語：英語掲載種別：記事・総説・解説・論説等（国際会議プロシーディングズ）出版者・発行元：Institute of Electrical and Electronics Engineers Inc.

Improving the countermeasures against side-channel attacks (SCAs) increases the cost of both designing the countermeasures and evaluating SCA resistance. This may force cryptographic ICs to remain vulnerable. The increased cost is due to an indispensable procedure where a large number of side-channel traces need to be analyzed in order to evaluate the SCA resistance. In this work, a low-cost method to design and evaluate countermeasures using the signal-to-noise ratio (SNR) of side-channel traces as design and evaluation criteria is proposed. The method combines two existing methods: A prediction method of correlation coefficients between side-channel traces and a power model based on the SNR of the side-channel traces, and an estimation method of the number of traces needed to disclose the secret key based on the correlation coefficients. We construct a method to measure the SNR of side-channel traces and validate it for the design and evaluation criteria. In our method, the SNR is first calculated from signal and noise variances extracted from side-channel traces by increasing the number of averaging in side-channel trace measurements, and then the correlation coefficients and the number of traces for key-disclose are estimated on the basis of the calculated SNR. We confirmed that the estimated correlation coefficient and the number of traces for key-disclose were in good agreement with the corresponding measured ones. This result demonstrates that the proposed method can accurately measure the SNR of side-channel traces.

DOI： 10.1109/APEMC.2017.7975433

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Signal-to-Noise Ratio Measurements of Side-Channel Traces for Establishing Low-Cost Countermeasure Design 査読国際誌

Y. Yano, T. Teshima, K. Iokibe, Y. Toyota

2017 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC 2017), WE-PM-7-2 93 - 95 2017年5月

Parameter Identification of a Noise-source Linear Equivalent Circuit of DC-DC Converter 査読

Yuhei Osaki, Yusuke Yano, Kengo Iokibe, Yoshitaka Toyota

Proceedings of 2017 Asia-Pacific International Symposium on Electromagnetic Compatibility 117 ( 1(EMCJ2017 1-6) ) 217 - 217 2017年

Crosstalk Reduction by Introducing Periodic Structure into Dense Differential Pairs 査読

Hiroaki Takeda, Kengo Iokibe, Yoshitaka Toyota

Proceedings of 2017 Asia-Pacific International Symposium on Electromagnetic Compatibility 353 - 353 2017年

Security Analysis of Raspberry Pi Against Side-Channel Attack with RSA Cryptography 査読

Sanada, Akihiro, Nogami, Yasuyuki, Iokibe, Kengo, Khandaker, Md. Al-Amin

2017 IEEE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS - TAIWAN (ICCE-TW) 2017年

Optimal Design of Vialess Open-stub EBG structure for Power-bus Noise Reduction

Kohtaro Okimoto, Kengo Iokibe, Yoshitaka Toyota, Koichi Kondo, Shigeyoshi Yoshida, Toshiyuki Kaneko

2016 IEEE CPMT SYMPOSIUM JAPAN (ICSJ) 243 - 246 2016年

記述言語：英語出版者・発行元：IEEE

To overcome the intra EMC problems in wireless communications, electromagnetic bandgap (EBG) structures can be used to effectively reduce power-bus noise. We previously proposed a vialess open-stub EBG structure. However, it still has the intrinsic disadvantage of a narrow stopband because it uses the open-stub's resonance. Thus, this paper aims to optimize the structural parameters of the vialess open-stub EBG structure to sufficiently suppress power-bus noise in a wider stopband. The structural parameters to determine the noise-reduction performance of the vialess open-stub EBG structure are the branch width rob, the stub width w(s), and the unit-cell length alpha. Rectangular power buses were designed as test vehicles through the analytical approach and used to evaluate the stopband expansion and the noise suppression in the stopband in a full wave simulation. The transmission characteristics showed that, after w(b), W-s, and a are optimized, the stopband is expanded from 0.61 GHz (2.23-2.84 GHz) to 1.56 GHz (2.20-3.76 GHz). In addition, an optimized structure was made that reduced the amount of noise by approximately 10 dB.

DOI： 10.1109/ICSJ.2016.7801273

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Evaluation of Information Leakage caused by Hardware Trojans Implementable in IC Peripheral Circuits

Kengo Iokibe, Yoshitaka Toyota

Proceedings of 2016 Asia-Pacific International Symposium on Electromagnetic Compatibility & Signal Integrity 701 2016年

Design Methodology of Tightly Coupled Asymmetrically Tapered Bend for High-density Mounting in Differential Transmission Lines

Chenyu Wang, Kengo Iokibe, Yoshitaka Toyota

2016 ASIA-PACIFIC INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (APEMC) 463 - 465 2016年

記述言語：英語出版者・発行元：IEEE

The bend in a pair of differential transmission lines on printed circuit boards causes a path difference, which leads to mode conversion due to the phase difference. We previously proposed a tightly coupled asymmetrically tapered bend to suppress forward differential-to-common mode conversion. In this paper, we propose a design methodology of our tightly coupled asymmetrically tapered bend that limits the bend structure within the area of the original classic bend for high-density mounting. We also evaluated the 45-degree-angle bend formed based on our design methodology and found that the methodology helps improve or maintain its transmission characteristics compared to those of the classic bend.

DOI： 10.1109/APEMC.2016.7522769

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Modal-equivalent Circuit with Injection Probe Models for Electromagnetic Immunity Analysis

Koji Kumegawa, Kengo Iokibe, Yoshitaka Toyota

2016 URSI Asia-Pacific Radio Science Conference (AP-RASC 2016), S-E1-3 130 - 133 2016年

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