著者

石田 謙司

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

電子情報通信学会論文誌 C (ISSN:13452827)

巻号頁・発行日

vol.J106-C, no.12, pp.408-414, 2023-12-01

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有機材料特有の柔軟性,生体親和性を利用したフレキシブル有機圧電薄膜のインプランタブル生体センサ/発電素子の検討を行った.心臓モデルでの発電出力計測に加え,アレーセンサによる心臓の動きを3次元的に測定するデバイスを開発した.

著者

Serdar BOZTAŞ Ferruh ÖZBUDAK Eda TEKİN

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences (ISSN:09168508)

巻号頁・発行日

vol.E106-A, no.12, pp.1461-1469, 2023-12-01

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In this paper we obtain a new method to compute the correlation values of two arbitrary sequences defined by a mapping from F4n to F4. We apply this method to demonstrate that the usual nonbinary maximal length sequences have almost ideal correlation under the canonical complex correlation definition and investigate some decimations giving good cross correlation. The techniques we develop are of independent interest for future investigation of sequence design and related problems, including Boolean functions.

著者

佐藤 啓介 大島 一郎 中野 久松

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

電子情報通信学会論文誌 B (ISSN:13444697)

巻号頁・発行日

vol.J106-B, no.12, pp.797-804, 2023-12-01

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本論文は,28 GHz帯用の高利得マルチビーム誘電体ロッドアンテナシステムを提案している.本アンテナは,扇形に配置された四つの誘電体ロッド部と,4素子リニアパッチアレーによる励振部とから構成されている.4方向高利得マルチビームの27 GHz~29.5 GHzにおいてVSWR = 2以下,利得19 dBi以上のアンテナ特性が得られるように設計する.試作機のVSWRと指向性はシミュレーションと良く一致する特性を示している.

著者

Shuichi FUKUNAGA

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (ISSN:09168508)

巻号頁・発行日

vol.E106.A, no.12, pp.1580-1584, 2023-12-01 (Released:2023-12-01)

参考文献数

14

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The robust recursive identification method of ARX models is proposed using the beta divergence. The proposed parameter update law suppresses the effect of outliers using a weight function that is automatically determined by minimizing the beta divergence. A numerical example illustrates the efficacy of the proposed method.

著者

Chris MANGELSDORF

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE TRANSACTIONS on Electronics (ISSN:09168516)

巻号頁・発行日

vol.E106-C, no.10, pp.516-520, 2023-10-01

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Recent years have seen a decline in the art of analog IC design even though analog interface and analog signal processing remain just as essential as ever. While there are many contributing factors, four specific pressures which contribute the most to the loss of creativity and innovation within analog practice are examined: process evolution, risk aversion, digitally assisted analog, and corporate culture. Despite the potency of these forces, none are found to be insurmountable obstacles to reinvigorating the industry. A more creative future is within our reach.

著者

Tiantian Zhang Ping Zhu Junjie Lian Yunchun Liu

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE Electronics Express (ISSN:13492543)

巻号頁・発行日

vol.20, no.22, pp.20230390, 2023-11-25 (Released:2023-11-25)

参考文献数

31

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The stress analysis of packaging on packaging (POP) under random vibration loading is conducted using the finite element model. The effect of structural parameters on solder joint stresses is analyzed by sensitivity analysis. Stress fitting is performed using the response surface method (RSM), and the optimization module is used to optimi-ze the structural parameters of POP packaging. The results demonstrate a reduction of 0.016 and 0.0031MPa in upper and lower solder joint stresses, respectively. This optimization of the structural parameters improves the reliability of the electronic packaging structure.

著者

Makoto Mizuguchi Akitoshi Takayasu Takayuki Kubo Shin'ichi Oishi

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

Nonlinear Theory and Its Applications, IEICE (ISSN:21854106)

巻号頁・発行日

vol.7, no.3, pp.386-394, 2016 (Released:2016-07-01)

参考文献数

20

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This paper is concerned with the embedding constant of the Sobolev type inequality for fractional derivatives on $\Omega\subset\mathbb{R}^{N}~(N\in\mathbb{N})$. The constant is explicitly described using the analytic semigroup over L2(Ω) generated by the Laplace operator. Some numerical examples of estimating the embedding constant are also provided.

著者

Yusuke Yano Kazuha Ishida Jianqing Wang Takeshi Ishida

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE Communications Express (ISSN:21870136)

巻号頁・発行日

vol.12, no.9, pp.457-463, 2023-09-01 (Released:2023-09-01)

参考文献数

6

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Focusing on the TLP (transmission line pulse) method used for ESD (electrostatic discharge) saturation measurement described in IEC 62228-5 Annex E, we investigated the validity of its measurement conditions. Since there is no provision for the cable length between a TLP test system and a device under test, we investigated the influence of the cable length on the ESD saturation measurement. The result shows that different voltage and current waveforms in the measurement time window, i.e., different I/V characteristics, can be obtained due to the cable propagation delay. This paper proposes a method to correct the influence of the cable length by using the rising edge of the reflected wave observed at the TLP test system as a trigger for the measurement time window.

著者

Yulin Liu Mingxing Du Jinliang Yin Chao Dong

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE Electronics Express (ISSN:13492543)

巻号頁・発行日

vol.20, no.21, pp.20230275, 2023-11-10 (Released:2023-11-10)

参考文献数

30

被引用文献数

1

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In this paper, we propose to use the junction temperature difference estimated by two temperature-sensitive electric parameters (TSEPs), threshold voltage, and p-n junction forward voltage of the IGBT module to monitor the aging of the bond wires. When the bond wires are lifted off, the chip surface temperature and the overall temperature gradient will increase, making the temperature difference measured by these two TSEPs larger. A new method is proposed in this paper to monitor the aging of the bonding wires of IGBT modules by the difference between them, and the correctness of the proposed method is verified by experiments on IGBT modules with different degrees of bonding wire aging.

著者

小八重 智史 吉原 和明 谷本 優太 藤木 卓 渡辺 健次

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

電子情報通信学会論文誌 D (ISSN:18804535)

巻号頁・発行日

vol.J106-D, no.11, pp.481-491, 2023-11-01

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AI技術が急速に進歩する中にあって,我が国では将来的なAI人材の不足が指摘されている.本研究ではまず,中学生段階におけるAIに関する学習内容や学習方法が確立されていなかったことから,中学生を対象にAIに関する知識のつながりや概念の構造を明らかにして学習内容を整理するために,「中学生向けAI概念図」を開発し,それを基に題材指導計画を開発した.次に,中学生を対象にディープラーニングの仕組みを学習する授業の実現を意図し,顔認証セキュリティシステム教材を開発した.教材は,生徒が一人一台学習者用端末を用いて機械学習に用いる学習用データとなる顔写真を自分で用意し,各パラメータを設定することで機械学習モデルの性能に関与できること,自分の設定したパラメータによる成果を視覚的に確認し,それを基に試行錯誤することを可能としている.開発した題材指導計画に基づいた授業実践を行い,有用性を確認した.

著者

Jayson ROOK Chi-Hao CHENG

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE TRANSACTIONS on Information and Systems (ISSN:09168532)

巻号頁・発行日

vol.E106-D, no.11, pp.1822-1830, 2023-11-01

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A multifunctional radar (MFR) with varying pulse sequences can change its signal characteristics and/or pattern, based on the presence of targets and to avoid being jammed. To take a countermeasure against an MFR, it is crucial for an electronic warfare (EW) system to be able to identify and separate a MFR's modes via analyzing intercepted radar signals, without a priori knowledge. In this article, two correlation-based methods, one taking the signal's order into account and another one ignoring the signal's order, are proposed and investigated for this task. The results demonstrate their great potential.

著者

渡辺 重佳

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

電子情報通信学会論文誌 C (ISSN:13452827)

巻号頁・発行日

vol.J106-C, no.11, pp.403-404, 2023-11-01

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複数入力可能な複数入力積層型Gate-All-Around (GAA)トランジスタ構造を新たに提案した.8F2(Fはデザインルール)の微細なパターン面積の中に高速低電力なCMOS NAND,NOR回路が実現できることを初めて示した.ロジックLSIで良く使用される入力数4の場合,過去最少のパターン面積を実現した積層型SGTと比較して高速性能を保持しつつ平面パターン面積を40%に縮小できる.

著者

Yoshihiro Yonemura Yuichi Katori

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

Nonlinear Theory and Its Applications, IEICE (ISSN:21854106)

巻号頁・発行日

vol.12, no.2, pp.143-156, 2021 (Released:2021-04-01)

参考文献数

20

被引用文献数

3 6

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We propose a hierarchical network model based on predictive coding and reservoir computing as a model of multi-modal sensory integration in the brain. The network is composed of visual, auditory, and integration areas. In each area, the dynamical reservoir acts as a generative model that reproduces the time-varying sensory signal. The states of the visual and auditory reservoir are spatially compressed and are sent to the integration area. We evaluate the model with a dataset of time courses, including a pair of visual (hand-written characters) and auditory (read utterances) signal. We show that the model learns the association of multiple modalities of the sensory signals and that the model reconstructs the visual signal from a given corresponding auditory signal. Our approach presents a novel dynamical mechanism of the multi-modal information processing in the brain and the fundamental technology for a brain like an artificial intelligence system.

著者

牧野 滋 中嶋 宏昌 山本 伸一

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

電子情報通信学会論文誌 B (ISSN:13444697)

巻号頁・発行日

vol.J106-B, no.11, pp.657-668, 2023-11-01

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本論文では,リフレクトアレーアンテナにおける開口上の波面と所望の平面波面との光路長差である残留収差の周波数特性を幾何光学の手法により定式化,その理論限界を明らかにする.また,球面波で近似した波面が鏡面構成,具体的には,平面反射鏡による一次放射器の像(イメージホーン)の位置で決まることを明らかにする.その結果より,リフレクトアレーアンテナの周波数特性を改善する方法として,一次放射器の位相中心の周波数特性を利用する方法を提案する.最後に,試作モデルの測定により,これらの妥当性を示す.

著者

洞井 裕介 領木 慎一 山下 真弘 長坂 雄一 仙田 航基 坂本 洋介

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

電子情報通信学会論文誌 B (ISSN:13444697)

巻号頁・発行日

vol.J106-B, no.8, pp.582-593, 2023-08-01

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ローカル5Gは,携帯電話事業者による全国向けの5Gとは別に,5Gを企業等が自らの建物,敷地内で整備できる制度である.鉄道事業者においてローカル5Gを導入するためには,車両走行中の伝送品質等の動的変化や,敷地外へ漏れる電波の影響について,鉄道固有環境での検証が必要である.今回,新幹線回送線沿いにローカル5Gシステムを構築し,指令からの監視等,走行中の回送車両上から地上への映像伝送や,車両センターにおける保守作業にローカル5Gを活用することを念頭に試験を実施し,ローカル5Gにおける伝送品質等の動的変化,映像伝送特性,車両センター着発収容庫車両内の電波特性,敷地外電波強度に関するデータを収集・解析し,鉄道固有環境が及ぼす影響を検証した.その結果,回送車両上と地上との間で,システム仕様上の最大スループットを達成し,地上への4Kカメラ映像伝送に成功した.また,車両センター着発収容庫内の電波環境を明らかにした.更に,自己土地から最大約1 km離れた地点で,制度上調整対象区域とされる強度の電波を観測した.そして,使用環境が屋外か屋内かにかかわらず,自己土地外での電波強度確認が必要であることを明らかにした.

著者

Xiaohu WANG Yubin DUAN Yi WEI Xinyuan CHEN Huang ZHUN Chaohui ZHAO

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE TRANSACTIONS on Communications (ISSN:09168516)

巻号頁・発行日

vol.E106-B, no.11, pp.1102-1108, 2023-11-01

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With the gradually increase of the application of new energy in microgrids, Electric Spring (ES), as a new type of distributed compensation power electronic device has been widely studied. The Generalized Electric Spring (G-ES) is an improved topology, and the space limitation problem in the traditional topology is solved. Because of the mode of G-ES use in the power grid, a reasonable solution to the voltage loss of the critical section feeder is needed. In this paper, the voltage balance equation based on the feedforward compensation coefficient is established, and a two cascade control strategy based on the equation is studied. The first stage of the two cascade control strategy is to use communication means to realize the allocation of feedforward compensation coefficients, and the second stage is to use the coefficients to realize feedforward fixed angle control. Simulation analysis shows that the proposed control strategy does not affect the control accuracy of the critical load (CL), and effectively improves the operational range of the G-ES.

著者

Shingo FUJIMOTO Takuma TAKEUCHI Yoshiki HIGASHIKADO

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE Transactions on Information and Systems (ISSN:09168532)

巻号頁・発行日

vol.E105.D, no.2, pp.227-234, 2022-02-01 (Released:2022-02-01)

参考文献数

25

被引用文献数

4

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Blockchain is a distributed ledger technology used for trading digital assets, such as cryptocurrency, and trail records that need to be audited by third parties. The use cases of blockchain are expanding beyond cryptocurrency management. In particular, the token economy, in which tokenized assets are exchanged across different blockchain ledgers, is gaining popularity. Cross-chain technologies such as atomic swap have emerged as security technologies to realize this new use case of blockchain. However, existing approaches of cross-chain technology have unresolved issues, such as application limitations on different blockchain platforms owing to the incompatibility of the communication interface and crypto algorithm and inability to handle a complex business logic such as the escrow trade. In this study, the ConnectionChain is proposed, which enables the execution of an extended smart contract using abstracted operation on interworking ledgers. Moreover, field experimental results using the system prototype are presented and explained.

著者

Shugang Liu Jiangtao Liu Qiangguo Yu Jie Zhan

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE Electronics Express (ISSN:13492543)

巻号頁・発行日

vol.20, no.20, pp.20230354, 2023-10-25 (Released:2023-10-25)

参考文献数

30

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In integrated designs of multiple IP cores across clock domains, signal metastability can occur due to unequal wiring and variations in PVT. This leads to inconsistency between the signals obtained by the target and the signals at the source. Establishing a FIFO is one of the crucial methods for addressing data inconsistency. Therefore, this paper proposes a novel array structure based on one-hot coding, where the row and column codes generated by Johnson counters are XORed to create the address pointer. This innovation reduces the area for the FIFO and enables rapid control logic using one-hot coding. Furthermore, a state-based approach is employed to mitigate the impact of memory size on the empty/full detection circuit. It only records the read-and-write addresses, enhancing the reconfigurability of the FIFO. Using the SMIC 0.18µm process, the synthesis and simulation results demonstrate that the FIFO can achieve a maximum operating frequency of 830MHz. Additionally, compared to similar synchronous FIFO, it exhibits a significant 30% reduction in area. When considering different FIFO depths and widths, the method proposed in the paper shows an area reduction of 30% to 47% compared to similar synchronous methods. For a depth of 16 and a data width of one word, the power consumption is about 6.8 mW. The FIFO presented in this paper can serve as a reference for data transmission between different clock domains.

著者

Bin TANG Jianxin LUO Guiqiang NI Weiwei DUAN Yi GAO

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE Transactions on Information and Systems (ISSN:09168532)

巻号頁・発行日

vol.E100.D, no.1, pp.234-237, 2017-01-01 (Released:2017-01-01)

参考文献数

8

被引用文献数

1

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This letter proposes a Light Space Partitioned Shadow Maps (LSPSMs) algorithm which implements shadow rendering based on a novel partitioning scheme in light space. In stead of splitting the view frustum like traditional Z-partitioning methods, we split partitions from the projection of refined view frustum in light space. The partitioning scheme is performed dual-directionally while limiting the wasted space. Partitions are created in dynamic number corresponding to the light and view directions. Experiments demonstrate that high quality shadows can be rendered in high efficiency with our algorithm.

著者

Tsubasa SASAKI Kenji SAWADA Seiichi SHIN Shu HOSOKAWA

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences (ISSN:09168508)

巻号頁・発行日

vol.E100-A, no.10, pp.2086-2094, 2017-10-01

被引用文献数

14

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This paper aims to propose a Fallback Control System isolated from cyber-attacks against networked control systems. The fallback control system implements maintaining functionality after an incident. Since cyber-attacks tamper with the communication contents of the networked control systems, the fallback control system is installed in a control target side. The fallback control system detects the incident without the communication contents on field network. This system detects an incident based on a bilinear observer and a switched Lyapunov function. When an incident is detected, normal operation is switched to fallback operation automatically. In this paper, a practical experiment with Ball-Sorter simulating a simple defective discriminator as a part of Factory Automation systems is shown. Assumed cyber-attacks against Ball-Sorter are Man In The Middle attack and Denial of Service attack.