Science China Information Sciences最新文献_第5页

Fairness in machine learning: definition, testing, debugging, and application 机器学习的公平性：定义、测试、调试和应用

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-08-15 DOI: 10.1007/s11432-023-4060-x

Xuanqi Gao, Chao Shen, Weipeng Jiang, Chenhao Lin, Qian Li, Qian Wang, Qi Li, Xiaohong Guan

引用次数: 0

Achieving full mutualism with massive passive devices for multiuser MIMO symbiotic radio 利用海量无源设备实现多用户多输入多输出共生无线电的完全互操作性

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-08-15 DOI: 10.1007/s11432-024-4066-7

Jingran Xu, Zhuoyin Dai, Yong Zeng, Shi Jin, Tao Jiang

{"title":"Achieving full mutualism with massive passive devices for multiuser MIMO symbiotic radio","authors":"Jingran Xu, Zhuoyin Dai, Yong Zeng, Shi Jin, Tao Jiang","doi":"10.1007/s11432-024-4066-7","DOIUrl":"https://doi.org/10.1007/s11432-024-4066-7","url":null,"abstract":"Symbiotic radio (SR) is one of the attractive communication technologies to facilitate large-scale Internet of Things (IoT) connections with enhanced energy and spectrum efficiency, where passive backscatter devices (BDs) modulate their information over the radio frequency (RF) signals emitted by the active primary transmitters (PTs). Meanwhile, the primary transmission can be strengthened with the additional multipaths created by BDs. To capitalize to a greater extent on the mutualism relationship between the two types of communication, this paper studies multiple-input multiple-output (MIMO) SR communication systems including multiple PTs and massive BDs. We derive the achievable rate expressions of each PT and BD, as well as the sum rate expressions of primary and secondary communication, respectively. Then asymptotic analysis is given to derive the active and passive communication rates with a large number of BDs. Furthermore, for the general case with a finite number of BDs, we study the precoding optimization problem to maximize the sum rate of primary communication, while ensuring that the sum rate of secondary communication and the individual rate for each PT and BD in the prescribed active and passive user sets satisfy the specified thresholds. Simulation results are presented to verify the analytical studies.","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":"14 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189465","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}

引用次数: 0

Nonsingularity of grain-like cascade feedback shift registers subject to fault attacks 受故障攻击的粒状级联反馈移位寄存器的非奇异性

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-08-12 DOI: 10.1007/s11432-023-4044-8

Haitao Li, Zhaoqi Liu, Wenrong Li

引用次数: 0

Flexible printed three dimensional (3D) integrated carbon nanotube complementary metal oxide semiconductor (CMOS) thin film transistors and circuits 柔性印刷三维（3D）集成碳纳米管互补金属氧化物半导体（CMOS）薄膜晶体管和电路

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-08-08 DOI: 10.1007/s11432-023-3933-7

Zhaofeng Chen, Jiaqi Li, Min Li, Hongxuan Guo, Jianwen Zhao

{"title":"Flexible printed three dimensional (3D) integrated carbon nanotube complementary metal oxide semiconductor (CMOS) thin film transistors and circuits","authors":"Zhaofeng Chen, Jiaqi Li, Min Li, Hongxuan Guo, Jianwen Zhao","doi":"10.1007/s11432-023-3933-7","DOIUrl":"https://doi.org/10.1007/s11432-023-3933-7","url":null,"abstract":"The threshold voltage modulation of carbon nanotube thin-film transistors (TFTs) and flexible three-dimensional (3D) integration circuits has become hot research topics for carbon-based electronics. In this paper, a doping-free gate electrode technology is introduced to significantly modulate the threshold voltage of polymer-sorted semiconducting single-walled carbon nanotube (sc-SWCNT) TFTs in combination with the highly effective gate-controlling ability of solid-state electrolyte thin films as the dielectrics. A systematic investigation was conducted on the impact of printed silver, evaporated silver, and evaporated aluminum (Al) gate electrodes on the threshold voltage of flexible printed bottom-gate and top-gate SWCNT TFTs. The results indicate that the SWCNT TFTs with Al gate electrodes exhibit enhancement-mode characteristics with excellent electrical properties, such as the negative threshold voltages (−0.6 V), high Ion/Ioff (up to 106), low subthreshold swing (61.4 mV · dec−1), and small hysteresis. It is attributed to either the formation of lower work function thin films (Al2O3) at the electrode/dielectric layer interfaces through the natural oxidation of the Al bottom-gate electrodes or the dipole reaction of the Al top-gate electrodes from X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) data. In addition, 3D complementary metal-oxide-semiconductor (CMOS) inverters with common gate electrodes were constructed using the resulting enhancement-mode P-type SWCNT TFTs and matched N-type SWCNT TFTs, which shows high voltage gain (34), rail-to-rail output and high noise margins (80.04%, VDD = −1 V) as well good mechanical flexibility at low operation voltages. It demonstrates that SWCNT TFTs have great advantages for building large-scale 3D flexible integrated circuits.","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":"66 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189466","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}

引用次数: 0

SDCC: software-defined collective communication for distributed training SDCC：用于分布式培训的软件定义集体通信

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-07-31 DOI: 10.1007/s11432-023-3894-4

Xin Jin, Zhen Zhang, Yunshan Jia, Yun Ma, Xuanzhe Liu

引用次数: 0

Dynamic event-triggered fault-tolerant cooperative resilient tracking control with prescribed performance for UAVs 具有规定性能的无人飞行器动态事件触发容错合作弹性跟踪控制

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-07-25 DOI: 10.1007/s11432-023-4099-x

Rong Yuan, Zhengcai An, Shuyi Shao, Mou Chen, Mihai Lungu

{"title":"Dynamic event-triggered fault-tolerant cooperative resilient tracking control with prescribed performance for UAVs","authors":"Rong Yuan, Zhengcai An, Shuyi Shao, Mou Chen, Mihai Lungu","doi":"10.1007/s11432-023-4099-x","DOIUrl":"https://doi.org/10.1007/s11432-023-4099-x","url":null,"abstract":"In this paper, a resilient tracking control scheme with cooperative collision avoidance performance is studied for the fixed-wing unmanned aerial vehicle (UAV) leader-follower formation in the presence of actuator failures and external disturbances. Firstly, based on the control objectives of UAV formation tracking and collision avoidance, the transformation tracking errors are obtained using the prescribed performance control technique. Next, a fault detection mechanism is introduced to determine if there is the actuator fault. Subsequently, the event-triggered resilient fault observers are designed based on a dynamic event-triggered mechanism to estimate actuator faults. Furthermore, the prescribed performance functions and the H∞ performance index are employed to ensure the UAV formation collision-free and mitigate the impact of disturbances. Moreover, the resilient controller is designed to minimize the effect of the perturbations for the control gain and the fault observer gain on the system. The stability of the system is also proven through the Lyapunov stability analysis, and the controller gains are calculated by solving the linear matrix inequality. Finally, the validity of the proposed control strategy is demonstrated by the simulation analysis.","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":"41 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141784750","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}

引用次数: 0

A path planning algorithm for a crop monitoring fixed-wing unmanned aerial system 作物监测固定翼无人机系统的路径规划算法

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-07-25 DOI: 10.1007/s11432-023-4087-4

Longhao Qian, Yi Lok Lo, Hugh Hong-tao Liu

引用次数: 0

An adaptive 3D reconstruction method for asymmetric dual-angle multispectral stereo imaging system on UAV platform 无人机平台上不对称双角度多光谱立体成像系统的自适应三维重建方法

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-07-25 DOI: 10.1007/s11432-024-4056-8

Chen Wang, Xian Li, Yanfeng Gu, Zixu Wang

{"title":"An adaptive 3D reconstruction method for asymmetric dual-angle multispectral stereo imaging system on UAV platform","authors":"Chen Wang, Xian Li, Yanfeng Gu, Zixu Wang","doi":"10.1007/s11432-024-4056-8","DOIUrl":"https://doi.org/10.1007/s11432-024-4056-8","url":null,"abstract":"A multispectral imaging system often cannot capture 3D spatial information owing to hardware limitations, which diminishes the effectiveness across various domains. To address this problem, we have developed a multispectral stereo imaging system along with an adaptive 3D reconstruction algorithm. Unlike existing unmanned aerial vehicle stereo imaging systems, our multispectral stereo imaging system uses two multispectral cameras with asymmetric spectral bands positioned at different angles. This design enables the acquisition of a higher number of bands and lateral spatial information while maintaining a lightweight structure. This system introduces challenges such as large geometric distortions and intensity differences between multiple bands. To accurately recover 3D spatial information, we propose an adaptive 3D reconstruction method. This method employs a position and orientation system-assisted projection transformation and a normalized threshold adjustment strategy. Finally, mutual information is used to reconstruct the multispectral images densely, effectively addressing nonlinear differences and generating a comprehensive multispectral point cloud. Our stereo system was used for two real data collections in different regions, and the efficacy of the proposed 3D reconstruction method was validated by comparing it with existing methods and commercial software.","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":"86 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141784751","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}

引用次数: 0

Autonomous multi-drone racing method based on deep reinforcement learning 基于深度强化学习的多无人机自主竞速方法

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-07-25 DOI: 10.1007/s11432-023-4029-9

Yu Kang, Jian Di, Ming Li, Yunbo Zhao, Yuhui Wang

{"title":"Autonomous multi-drone racing method based on deep reinforcement learning","authors":"Yu Kang, Jian Di, Ming Li, Yunbo Zhao, Yuhui Wang","doi":"10.1007/s11432-023-4029-9","DOIUrl":"https://doi.org/10.1007/s11432-023-4029-9","url":null,"abstract":"Racing drones have attracted increasing attention due to their remarkable high speed and excellent maneuverability. However, autonomous multi-drone racing is quite difficult since it requires quick and agile flight in intricate surroundings and rich drone interaction. To address these issues, we propose a novel autonomous multi-drone racing method based on deep reinforcement learning. A new set of reward functions is proposed to make racing drones learn the racing skills of human experts. Unlike previous methods that required global information about tracks and track boundary constraints, the proposed method requires only limited localized track information within the range of its own onboard sensors. Further, the dynamic response characteristics of racing drones are incorporated into the training environment, so that the proposed method is more in line with the requirements of real drone racing scenarios. In addition, our method has a low computational cost and can meet the requirements of real-time racing. Finally, the effectiveness and superiority of the proposed method are verified by extensive comparison with the state-of-the-art methods in a series of simulations and real-world experiments.","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":"104 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141784830","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}

引用次数: 0

EmotionIC: emotional inertia and contagion-driven dependency modeling for emotion recognition in conversation EmotionIC：用于对话中情绪识别的情绪惯性和传染驱动依赖建模

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-07-25 DOI: 10.1007/s11432-023-3908-6

Yingjian Liu, Jiang Li, Xiaoping Wang, Zhigang Zeng

{"title":"EmotionIC: emotional inertia and contagion-driven dependency modeling for emotion recognition in conversation","authors":"Yingjian Liu, Jiang Li, Xiaoping Wang, Zhigang Zeng","doi":"10.1007/s11432-023-3908-6","DOIUrl":"https://doi.org/10.1007/s11432-023-3908-6","url":null,"abstract":"Emotion recognition in conversation (ERC) has attracted growing attention in recent years as a result of the advancement and implementation of human-computer interface technologies. In this paper, we propose an emotional inertia and contagion-driven dependency modeling approach (EmotionIC) for ERC tasks. Our EmotionIC consists of three main components, i.e., identity masked multi-head attention (IM-MHA), dialogue-based gated recurrent unit (DiaGRU), and skip-chain conditional random field (SkipCRF). Compared to previous ERC models, EmotionIC can model a conversation more thoroughly at both the feature-extraction and classification levels. The proposed model attempts to integrate the advantages of attention- and recurrence-based methods at the feature-extraction level. Specifically, IMMHA is applied to capture identity-based global contextual dependencies, while DiaGRU is utilized to extract speaker- and temporal-aware local contextual information. At the classification level, SkipCRF can explicitly mine complex emotional flows from higher-order neighboring utterances in the conversation. Experimental results show that our method can significantly outperform the state-of-the-art models on four benchmark datasets. The ablation studies confirm that our modules can effectively model emotional inertia and contagion.","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":"71 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141784836","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}

引用次数: 0