Science China Information Sciences最新文献

{"title":"A unified intelligent control strategy synthesizing multi-constrained guidance and avoidance penetration","authors":"Sibo Zhao, Jianwen Zhu, Weimin Bao, Xiaoping Li","doi":"10.1007/s11432-022-4063-x","DOIUrl":"https://doi.org/10.1007/s11432-022-4063-x","url":null,"abstract":"<p>We propose an intelligent control strategy that synthesizes optimal guidance and SAC, guidance and NFZs avoidance missions are realized with high precision and low energy loss. The training efficiency is enhanced by introducing a prediction method to calculate the terminal states and adding process rewards. By improving the training process, the learned strategy has a strong generalization on problems of dynamic NFZs, indicating higher applicability and flexibility in flight missions.</p>","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":null,"pages":null},"PeriodicalIF":8.8,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141502711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Highly sensitive flexible strain sensor based on the two-dimensional semiconductor tellurium with a negative gauge factor","authors":"Jiarui He, Yusong Qu, Shengyao Chen, Cong Wang, Lena Du, Xiaoshan Du, Yuanyuan Zheng, Guozhong Zhao, He Tian","doi":"10.1007/s11432-023-3938-y","DOIUrl":"https://doi.org/10.1007/s11432-023-3938-y","url":null,"abstract":"<p>Research on flexible strain sensors has advanced rapidly in recent years, with particular attention being devoted to two-dimensional (2D) semiconductor materials owing to their exceptional mechanical and electrical properties that are conducive to sophisticated sensing performance. However, resistive strain sensors based on 2D semiconductor materials typically exhibit positive gauge factors (GF), while materials for strain sensors with a negative GF remain elusive. We have identified a trend of reduction in the band gap of the emerging 2D semiconductor material tellurium (Te) under strain in simulations reported in past research, and have observed a negative GF in the Te-based strain sensor. In this study, we combined Te with a flexible polyethylene terephthalate (PET) substrate to manufacture a flexible strain sensor with a significantly negative GF. The results of tests revealed that the Te-based strain sensor achieved an impressive maximum sensitivity of −139.7 within a small range of bending-induced strain (&lt; 1%). Furthermore, it exhibited excellent linearity and good cyclic stability, and was successfully applied to monitor limb movements. The work here verifies the significant potential for the use of Te-based strain sensors in next-generation flexible electronics.</p>","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":null,"pages":null},"PeriodicalIF":8.8,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141502714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Blockchain-based immunization against kleptographic attacks","authors":"Changsong Jiang, Chunxiang Xu, Jie Chen, Kefei Chen","doi":"10.1007/s11432-023-3883-4","DOIUrl":"https://doi.org/10.1007/s11432-023-3883-4","url":null,"abstract":"","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":null,"pages":null},"PeriodicalIF":8.8,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141377950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Constructions of optimal binary locally repairable codes via intersection subspaces","authors":"Wenqin Zhang, Deng Tang, Chenhao Ying, Yuan Luo","doi":"10.1007/s11432-023-3863-y","DOIUrl":"https://doi.org/10.1007/s11432-023-3863-y","url":null,"abstract":"<p>Locally repairable codes (LRCs), which can recover any symbol of a codeword by reading only a small number of other symbols, have been widely used in real-world distributed storage systems, such as Microsoft Azure Storage and Ceph Storage Cluster. Since binary linear LRCs can significantly reduce coding and decoding complexity, constructions of binary LRCs are of particular interest. The aim of this paper is to construct dimensional optimal binary LRCs with disjoint local repair groups. We introduce a method to connect intersection subspaces with binary LRCs and construct dimensional optimal binary linear LRCs with locality 2^<i>b</i> (<i>b</i> ≽ 3) and minimum distance <i>d</i> ≽ 6 by employing intersection subspaces deduced from the direct sum. This method will sufficiently increase the number of possible repair groups of dimensional optimal LRCs, thus efficiently expanding the range of the construction parameters while keeping the largest code rates compared with all known binary linear LRCs with minimum distance <i>d</i> ≽ 6 and locality 2^<i>b</i>.</p>","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":null,"pages":null},"PeriodicalIF":8.8,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141196804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two-dimensional materials for future information technology: status and prospects","authors":"Hao Qiu, Zhihao Yu, Tiange Zhao, Qi Zhang, Mingsheng Xu, Peifeng Li, Taotao Li, Wenzhong Bao, Yang Chai, Shula Chen, Yiqi Chen, Hui-Ming Cheng, Daoxin Dai, Zengfeng Di, Zhuo Dong, Xidong Duan, Yuhan Feng, Yu Fu, Jingshu Guo, Pengwen Guo, Yue Hao, Jun He, Xiao He, Jingyi Hu, Weida Hu, Zehua Hu, Xinyue Huang, Ziyang Huang, Ali Imran, Ziqiang Kong, Jia Li, Qian Li, Weisheng Li, Lei Liao, Bilu Liu, Can Liu, Chunsen Liu, Guanyu Liu, Kaihui Liu, Liwei Liu, Sheng Liu, Yuan Liu, Donglin Lu, Likuan Ma, Feng Miao, Zhenhua Ni, Jing Ning, Anlian Pan, Tian-Ling Ren, Haowen Shu, Litao Sun, Yue Sun, Quanyang Tao, Zi-Ao Tian, Dong Wang, Hao Wang, Haomin Wang, Jialong Wang, Junyong Wang, Wenhui Wang, Xingjun Wang, Yeliang Wang, Yuwei Wang, Zhenyu Wang, Yao Wen, Haidi Wu, Hongzhao Wu, Jiangbin Wu, Yanqing Wu, Longfei Xia, Baixu Xiang, Luwen Xing, Qihua Xiong, Xiong Xiong, Jeffrey Xu, Tao Xu, Yang Xu, Liu Yang, Yi Yang, Yuekun Yang, Lei Ye, Yu Ye, Bin Yu, Ting Yu, Hui Zeng, Guangyu Zhang, Hongy..","doi":"10.1007/s11432-024-4033-8","DOIUrl":"https://doi.org/10.1007/s11432-024-4033-8","url":null,"abstract":"<p>Over the past 70 years, the semiconductor industry has undergone transformative changes, largely driven by the miniaturization of devices and the integration of innovative structures and materials. Two-dimensional (2D) materials like transition metal dichalcogenides (TMDs) and graphene are pivotal in overcoming the limitations of silicon-based technologies, offering innovative approaches in transistor design and functionality, enabling atomic-thin channel transistors and monolithic 3D integration. We review the important progress in the application of 2D materials in future information technology, focusing in particular on microelectronics and optoelectronics. We comprehensively summarize the key advancements across material production, characterization metrology, electronic devices, optoelectronic devices, and heterogeneous integration on silicon. A strategic roadmap and key challenges for the transition of 2D materials from basic research to industrial development are outlined. To facilitate such a transition, key technologies and tools dedicated to 2D materials must be developed to meet industrial standards, and the employment of AI in material growth, characterizations, and circuit design will be essential. It is time for academia to actively engage with industry to drive the next 10 years of 2D material research.</p>","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":null,"pages":null},"PeriodicalIF":8.8,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141196945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accumulated-state-error-based event-triggered sampling scheme and its application to H∞ control of sampled-data systems","authors":"Xian-Ming Zhang, Qing-Long Han, Bao-Lin Zhang, Xiaohua Ge, Dawei Zhang","doi":"10.1007/s11432-023-4038-3","DOIUrl":"https://doi.org/10.1007/s11432-023-4038-3","url":null,"abstract":"<p>This paper is concerned with event-triggered <i>H</i>_∞ control of sampled-data systems. Its novelties lie in three aspects: (i) A novel accumulated-state-error-based event-triggered scheme is introduced by comparing the integral of the state error from <i>t</i>_<i>k</i> to <i>t</i> with the system state sampled at <i>t</i>_<i>k</i>. This condition works well due to the fact that the so-called Zeno behaviour does not occur. (ii) A novel Lyapunov functional is constructed to establish a criterion to ensure some certain <i>H</i>_∞ performance of the closed-loop system. This Lyapunov functional is dependent on the integral of the state error involved in the event-triggered scheme. (iii) Under the event-triggered sampling scheme, suitable state-feedback controllers can be designed rather than be given a priori. Moreover, a self-triggered implementation of the proposed event-triggered sampling scheme is presented as well. Finally, a batch reactor model and an inverted pendulum system are given to demonstrate the effectiveness of the proposed method.</p>","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":null,"pages":null},"PeriodicalIF":8.8,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141256268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Beamforming design for covert broadcast communication with hidden adversary","authors":"Weiyu Chen, Haiyang Ding, Shilian Wang, Junshan Luo, Fengkui Gong","doi":"10.1007/s11432-023-3971-7","DOIUrl":"https://doi.org/10.1007/s11432-023-3971-7","url":null,"abstract":"<p>This paper explores covert broadcast communication in a challenging situation in which the transmitter, Alice, faces uncertainty regarding the position of the passive adversary, Willie. In this situation, controlling the signal exposure becomes difficult. Specifically, this paper focuses on the cases where Alice can delimit the suspicious areas where Willie may be located. The suspicious areas can have arbitrary number and shapes. Under the Rician fading model, the analytical expression of Willie’s detection performance is derived. Then, the transmit power, the beamforming direction, and the number of channel uses are jointly designed to minimize the optimal Willie’s detection performance among all the possible positions of Willie, on the premise of satisfying receivers’ quality-of-service requirements. To tackle the formulated knotty problem with an infinite number of irregular and discontinuous Willie’s possible positions, the continuous nature of the antenna pattern is exploited to convert the original problem into the one with a finite number of possible positions, by sampling the suspicious areas. Then, different algorithms are developed to address the resultant non-convex optimization problem for single-antenna Willie and multi-antenna Willie, respectively. Numerical results demonstrate significant performance gains of the proposed scheme over the widely-adopted maximum ratio transmission scheme, which indicates that simply adjusting the main lobe towards the receiver is indeed far away from optimum and shows the importance of leveraging Alice’s limited knowledge of Willie’s position.</p>","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":null,"pages":null},"PeriodicalIF":8.8,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hole mobility enhancement in monolayer WSe2 p-type transistors through molecular doping","authors":"Shiyuan Liu, Xiong Xiong, Xin Wang, Xinhang Shi, Ru Huang, Yanqing Wu","doi":"10.1007/s11432-024-4032-6","DOIUrl":"https://doi.org/10.1007/s11432-024-4032-6","url":null,"abstract":"<p>Two-dimensional (2D) transition metal dichalcogenide (TMDC) semiconductor materials exhibit extraordinary electrical properties, holding promise for the realization of next-generation complementary metal-oxide-semiconductor (CMOS) devices at ultimate scaling. However, constrained by effective device doping strategies, the hole mobility and device performance of tungsten diselenide (WSe₂) p-type transistors, especially monolayer chemical vapor deposition (CVD)-grown WSe₂, have not met expectations. In this paper, an effective performance enhancement of monolayer WSe₂ p-type transistor was achieved through a molecular doping strategy. Synthesizing monolayer WSe₂ directly on SiO₂ back-gated substrates and leveraging energy band alignment design, 4-nitrobenzenediazonium tetrafluoroborate (4-NBD) molecular dopant with a concentration of 10 mM was utilized to modulate the Fermi level position of monolayer WSe₂ for hole doping. The devices demonstrated a more than 98% increase in hole mobility, reaching up to 97 cm² · V⁻¹ · s⁻¹ while maintaining the current on/off ratio of 10⁸. Monolayer p-type WSe₂ transistors with 1 µm channel length exhibit a high drive current surpassing 176 µA · µm⁻¹, exceeding previous CVD-WSe₂ devices with similar channel length. This straightforward and effective approach to improving the electrical performance of WSe₂ transistors paves the way for advanced logic technologies based on transition metal dichalcogenide semiconductors.</p>","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":null,"pages":null},"PeriodicalIF":8.8,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141256055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Near-field wideband beam training for ELAA with uniform circular array","authors":"Yuhao Chen, Linglong Dai","doi":"10.1007/s11432-023-3970-7","DOIUrl":"https://doi.org/10.1007/s11432-023-3970-7","url":null,"abstract":"<p>Extremely large-scale antenna array (ELAA) at millimeter wave (mmWave) and Terahertz (THz) band has been considered a key technology for combating high attenuation in high-frequency bands in future 6G communications. Uniform circular arrays (UCAs) have attracted much attention because of their ability to provide flat beamforming gain at all angles. To realize efficient beamforming, beam training is widely used to acquire channel state information. However, with a large antenna number, the beam training overhead in ELAA systems becomes overwhelming. Moreover, with a large bandwidth, the beam defocus effect severely degrades beam training accuracy. To address these issues, this paper proposes a frequency-dependent focusing (FDF)-based beam training scheme to realize effective beam training in near-field wideband ELAA systems with UCA. Specifically, we first analyze the FDF property of UCA, where signals at different subcarriers can simultaneously focus on different distances. Then, by exploiting the FDF property to search different distances using different subcarriers simultaneously, we design a hierarchical codebook and propose an FDF-based beam training scheme. To reveal the effectiveness of the proposed scheme, we compare its necessary beam training overhead with that of existing schemes. Finally, the simulation results demonstrate that the proposed scheme can achieve accurate beam training in near-field wideband UCA systems with a low beam training overhead.</p>","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":null,"pages":null},"PeriodicalIF":8.8,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141165401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Distortion-aware beamforming design for multi-beam satellite communications with nonlinear power amplifiers","authors":"Xiang Xiao, Li You, Kezhi Wang, Xiqi Gao","doi":"10.1007/s11432-023-3969-4","DOIUrl":"https://doi.org/10.1007/s11432-023-3969-4","url":null,"abstract":"<p>Hardware components can cause different impairments, including power amplifier (PA) non-linearities, which inevitably impact the system performance of satellite communications (SATCOM). In this work, we consider a multi-beam SATCOM downlink system and investigate the distortion-aware beamforming scheme with the characteristics of PA non-linearities. Notably, we aim to maximize the resource efficiency (RE), defined as the weighted sum of energy efficiency (EE) with spectral efficiency (SE), to obtain a flexible EE-SE tradeoff while accounting for the characteristics of PA distortion and the total power constraints. Given that the optimization objective is a sum of ratios and the high non-convexity involved in constraints, we propose an efficient approach that exploits the quadratic transformation, the Lagrange multiplier method, and the gradient ascent approach to handle this issue. Simulation results demonstrate the effectiveness of the distortion-aware beamforming approach in achieving the EE-SE tradeoff and exhibit a substantial RE performance gain over the conventional approach with ideal linear PAs assumed at the satellite transmitters.</p>","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":null,"pages":null},"PeriodicalIF":8.8,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141165742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}