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<title cf:type="text"><![CDATA[Editorial department of the Journal of National University of Defense Technology -->电子科学与技术·计算机科学与技术·物理学]]></title>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Analysis on single-event radiation characteristics for a bandgap reference in bulk CMOS technologies]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202404018]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to analyze the single-event radiation characteristics of BGR(bandgap reference) under extreme conditions such as space environments, a BGR test chip was designed and implemented in both 65 nm and 28 nm bulk CMOS technologies. Pulse laser single-event simulation experiments were conducted to study its single-event radiation characteristics. The experimental results show that when the pulsed laser energy is sufficiently high, the output voltage of BGR significantly increases after irradiation and the voltage cannot recover after annealing, this indicates that SHD(single-event hard damage) presents in the BGR. Further studies indicate that the bipolar junction transistor in BGR is the sensitive device to induce hard damage. The investigation provides important theoretical references for SHD hardening design of BGR in bulk CMOS technologies.]]></description>
<pubDate>2024/7/19 0:00:00</pubDate>
<category><![CDATA[电子科学与技术·计算机科学与技术·物理学]]></category>
<author><![CDATA[WEN Yi, 陈建军, LIANG Bin, CHI Yaqing, XING Haiyuan, YAO Xiaohu]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WEN Yi, 陈建军, LIANG Bin, CHI Yaqing, XING Haiyuan, YAO Xiaohu</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202404018]]></guid><cfi:id>8</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Satellite domain corpus construction and named entity recognition]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202404019]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Aiming at the lack of named entity corpus in the satellite domain and the low recognition performance of existing algorithms, a satellite domain entity labeling method considering fuzzy boundaries was proposed, constructed a corpus containing 8 common satellite domain entities where the granularity was finer and the coverage was wider in comparison with the existing corpora in this field. Based on this, a transfer learning and multi-network fusion satellite domain entity recognition algorithm was proposed. Algorithm used pretrained bidirectional encoder representations for transformers to smoothly transfer the semantics of the corpus for subword-level features, a BiLSTM (bi-directional long-short term memory) network for capturing contextual information to determine boundaries, and label prediction was achieved using a conditional random field as a decoder. Experimental results show that, compared with traditional models such as BiLSTM, the proposed algorithm has better recognition performance where the <i>F<sub>1</sub></i>-score in 8 entities is all above 92% and the micro-average <i>F<sub>1</sub></i>-score reaches 96.10%.]]></description>
<pubDate>2024/7/19 0:00:00</pubDate>
<category><![CDATA[电子科学与技术·计算机科学与技术·物理学]]></category>
<author><![CDATA[XU Cong, SHI Huipeng, CHEN Zhimin, ZHANG Xinyu, WANG Jing, YANG Jiasen]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>XU Cong, SHI Huipeng, CHEN Zhimin, ZHANG Xinyu, WANG Jing, YANG Jiasen</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202404019]]></guid><cfi:id>7</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Inversion modeling method utilizing ship′s internal magnetic field]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202404020]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The integral equation method is widely used in ship′s magnetic field inversion modeling, but the model requires enough measurement points to obtain the ship′s magnetic field at a specific depth. To address the problem that the integral equation method uses the near-field magnetic field to model with poor accuracy, an improved measure by adding constraint equation was proposed. The numerical simulation of the magnetic field of a thin steel plate model and a 3D ship model was carried out respectively. The finite element method was used to initialize the selection of the ship′s internal measurement points. The inversion modeling was constructed based on the measured values of the internal magnetic field of the ship and the singular value decomposition method was used to solve the magnetic source parameters and predict the external space magnetic field. It shows that the root mean square error of the prediction results of the external space magnetic field of the ship is less than 12%. The magnetic field measurement experimental verification of the ship cabin model shows that the root mean square error of the prediction of the external magnetic field from the internal magnetic field of the cabin is about 13%, which proves the effectiveness of the proposed method and can improve the instability and insufficient accuracy of the traditional inversion model. The research results can provide ideas for the algorithm design of closed-loop degaussing of ships.]]></description>
<pubDate>2024/7/19 0:00:00</pubDate>
<category><![CDATA[电子科学与技术·计算机科学与技术·物理学]]></category>
<author><![CDATA[HE Baowei, ZHANG Junhong, LIU Shengdao, ZHOU Guohua, TANG Liezheng, ZONG Jingwen]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>HE Baowei, ZHANG Junhong, LIU Shengdao, ZHOU Guohua, TANG Liezheng, ZONG Jingwen</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202404020]]></guid><cfi:id>6</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Analysis of linearity and correlation of acoustic spread spectrum signal in multipath reverberation channel]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202404021]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[To analyze the correlation and linearity of acoustic spread spectrum signals in shallow water multipath channels, a virtual source calculation model for Pekeris waveguides in shallow waters with frequency attenuation and seabed loss was established. Pulse signals and spread spectrum signals in shallow seas were simulated, and the linearity of spread spectrum signals in a multipath reverberation environment was preliminarily investigated through experiments conducted in a reverberation chamber. Simulation results show that the frequency domain solution of the virtual source method is consistent with that of the normal mode method, and the same low-frequency mode dispersion phenomenon as the normal mode method can be obtained through the virtual source method, verifying that the virtual source method is suitable for low-frequency problems in ideal shallow water waveguides and Pekeris waveguides; when modal dispersion occurs, the correlation performance of low-frequency spread spectrum signals is better than that of high-frequency signals under the same conditions. Experimental results show that when the time-domain waveform of a low-frequency pulse is distorted and broadened, the spread spectrum signal of the same frequency can accurately measure the geometric delay of the reflected signal, demonstrating that the low-frequency multipath effect can still be regarded as the linear superposition of all "path" signals.]]></description>
<pubDate>2024/7/19 0:00:00</pubDate>
<category><![CDATA[电子科学与技术·计算机科学与技术·物理学]]></category>
<author><![CDATA[TANG Yongzhuang, ZHOU Qidou, XIE Zhiyong, LYU Xiaojun, JI Gang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>TANG Yongzhuang, ZHOU Qidou, XIE Zhiyong, LYU Xiaojun, JI Gang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202404021]]></guid><cfi:id>5</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Design and magnetic field analysis of linear phase-shifting transformer with hairpin filling structure]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202404022]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Based on the original linear phase-shifting transformer, a linear phase-shifting transformer with a hairpin filling structure was designed with reference to the theory of linear motor, which effectively solved the problems of complicated winding method, large size and modular series-parallel connection. At the same time, it improved the problems of reduced primary side excitation current density and air gap magnetic field distortion caused by the semi filled slot at the connection during modular connection. Working principle of the linear phase-shifting transformer system was briefly introduced; the design method of linear phase-shifting transformer with half-filled slot structure was proposed with reference to the design method of linear motor and rotary motor; the hairpin structure was adopted to eliminate a series of problems caused by the half-filled slot structure at the connection; finally, the finite element simulation was used to verify the comparison. Results show that the designed linear phase-shifting transformer with a hairpin structure has a good output waveform and a small distortion of the air gap magnetic field.]]></description>
<pubDate>2024/7/19 0:00:00</pubDate>
<category><![CDATA[电子科学与技术·计算机科学与技术·物理学]]></category>
<author><![CDATA[ZHAO Jinghong, XUE Jie, YAN Sinian]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHAO Jinghong, XUE Jie, YAN Sinian</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202404022]]></guid><cfi:id>4</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Inversion method of submarine steady electric field using point-type current source and Tikhonov regularization]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202404023]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to evaluate the distribution characteristics of submarine underwater corrosion related steady electric field, starting from the mechanism of submarine underwater corrosion related steady electric field, a forward model of submarine underwater corrosion related steady electric field was established based on the equivalent point-type current source theory. And the current intensity of the equivalent point-type current sources was solved by Tikhonov regularization according to the measured electric field data. The effectiveness of the proposed method was verified by commercial finite element software COMSOL. The results show that when inverting the electric field value from depth of 38 m to a water depth of 42.5 m and 33.5 m, the relative root mean square error, maximum relative error, and peak to peak relative error do not exceed 0.06. Even if the calculated depth reaches 45 m, the relative root mean square error is still less than 0.21. When the noise standard deviation is 0.1 times the maximum value of the actual electric field, the inversion error is still less than 0.1. This algorithm has strong noise resistance and high accuracy, can be used in engineering practice.]]></description>
<pubDate>2024/7/19 0:00:00</pubDate>
<category><![CDATA[电子科学与技术·计算机科学与技术·物理学]]></category>
<author><![CDATA[ZHANG Jianchun, LIU Chunyang, ZHAO Yulong]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Jianchun, LIU Chunyang, ZHAO Yulong</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202404023]]></guid><cfi:id>3</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[High precision frequency estimation algorithm for autocorrelation weighted fusion]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202404024]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to ensure the performance of radar countermeasure reconnaissance system in complex electromagnetic environment, a multi-segment signal frequency estimation algorithm based on autocorrelation weighted fusion was proposed. Autocorrelation processing was performed on each segment of the noisy signal to obtain a high SNR sinusoidal signal with zero initial phase and the same frequency as the original signal. The arcsine operator was used to construct a support matrix to perform real-time weighted fusion of the autocorrelated signals. The reference signal was established on the basis of the rough estimation, and the high-precision frequency estimation result was obtained by minimizing the error function. The simulation results show that, compared to existing algorithms, the algorithm not only improves the accuracy significantly, but also has stable estimation performance under the conditions of different SNRs, signal lengths and signal anomalies, while satisfying the low computational cost, which provides a reference for radar countermeasures intelligence reconnaissance based on multi-sensors.]]></description>
<pubDate>2024/7/19 0:00:00</pubDate>
<category><![CDATA[电子科学与技术·计算机科学与技术·物理学]]></category>
<author><![CDATA[LIU Kang, 何明浩, CHEN Changxiao, ZENG Sha, LI Zheng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIU Kang, 何明浩, CHEN Changxiao, ZENG Sha, LI Zheng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202404024]]></guid><cfi:id>2</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Security evaluation of Midori128 cryptographic algorithm under integral fault analysis]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202404025]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to study the security of the Midori128 cryptographic algorithm against integral fault attack, the relationship between integral distinguisher balance position, fault ciphertext, and the round key was established, and the last round key of the algorithm could be recovered by key search, and then the master key could be recovered by using key extension algorithm. The theoretical analysis shows that the time complexity of recovering the correct key is 2<sup>21</sup> and 2<sup>24</sup> when using 3 and 4 rounds of integral distinguisher for the integral fault attack, respectively. The accuracy, success rate, and elapsed time were used to simulate the attack process of the fourth round of injection fault, and the master key of the algorithm was successfully recovered. Comparison experiments were conducted for different plaintext groups and keys. The two sets of fault security analysis schemes conclude that the round function of the Midori128 algorithm is vulnerable to integral fault attacks and requires additional protection such as fault detection for at least the last 6 rounds while the algorithm is running.]]></description>
<pubDate>2024/7/19 0:00:00</pubDate>
<category><![CDATA[电子科学与技术·计算机科学与技术·物理学]]></category>
<author><![CDATA[WEI Yuechuan, HE Shuiyu, PAN Feng, WANG Xiangru]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WEI Yuechuan, HE Shuiyu, PAN Feng, WANG Xiangru</atom:name>
</atom:author>
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