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arXiv 2024年

作者： Chen, Yirui Wei, Pengjin Liu, Zhenhuan Wang, Bingchao Yang, Jie Liu, Wei Institute of Image Processing and Pattern Recognition Department of Automation Shanghai Jiao Tong University China Key Laboratory of System Control and Information Processing Ministry of Education China

Producing traversability maps and understanding the surroundings are crucial prerequisites for autonomous navigation. In this paper, we address the problem of traversability assessment using point clouds. We propose a novel pillar feature extraction module that utilizes PointNet to capture features from point clouds organized in vertical volume and a 2D encoder-decoder structure to conduct traversability classification instead of the widely used 3D convolutions. This results in less computational cost while even better performance is achieved at the same time. We then propose a new spatio-temporal attention module to fuse multi-frame information, which can properly handle the varying density problem of LIDAR point clouds, and this makes our module able to assess distant areas more accurately. Comprehensive experimental results on augmented Semantic KITTI and RELLIS-3D datasets show that our method is able to achieve superior performance over existing approaches both quantitatively and quantitatively. Our code is publicly available at https://***/chenyirui/FASTC. © 2024, CC BY.

关键词： Semantics

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Named Entity Recognition of Electronic Medical Records based on BERT-BiLSTM-Biaffine Model

Named Entity Recognition of Electronic Medical Records based...

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2023 Asia-Pacific Conference on Image processing, Electronics and Computers, IPEC 2023

作者： Wang, Peng Gu, Jinguang Institute of Computer Science and Technology Wuhan University of Science and Technology Wuhan China Hubei Prov. Key Laboratory of Intelligent Information Processing and Real Time Industrial Systems Wuhan University of Science and Technology Wuhan China

In the case of the specific task of identifying named entities within electronic medical record, it is hard to determine the boundary of nested entities, and existing NER systems have insufficient decoding performance. Based on the pre training model BERT, this paper introduces a novel network structure called Biaffine Layer using a bidirectional LSTM layer. The network uses a dual affine attention mechanism for semantic information learning, which can better interact with the semantic information of entity heads and entity tails, thereby achieving better recognition results for entities. Due to the sparsity of named entity datasets and the uneven distribution of entity categories, traditional binary cross entropy loss functions require multiple rounds of training to decode entities. In this paper, we have modified the binary cross entropy loss function to make the proposed model faster decode the entities that need to be identified. The model performs well, according to the experimental findings. The approach suggested in this paper offers a fresh approach to the NER issue raised by electronic medical records, and it is anticipated to considerably boost the effectiveness and caliber of clinical medical research. © Published under licence by IOP Publishing Ltd.

关键词： Decoding

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A Wideband Bowtie Antenna Fed with CPW for 5G mmWave Applications

A Wideband Bowtie Antenna Fed with CPW for 5G mmWave Applica...

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Global Symposium on Millimeter Waves, GSMM

作者： Yunyi Jiang Zhiqi Ke Kai Lu Nan Yang School of Electronics and Information Technology and Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems Sun Yat-sen University Guangzhou China

ISBN: (数字)9798350384956

ISBN: (纸本)9798350384963

In recent years, millimeter wave (mmWave) antennas have garnered considerable attention, especially in the realm of 5G applications. This study introduces a compact wideband planar bowtie antenna designed specifically for 5G mmWave communications. The antenna consists of a pair of bowtie patches that are fed by a grounded co-planar waveguide (GCPW). Notably, this design requires only two thin substrate layers. Simulation results demonstrate that the antenna offers a broad bandwidth of 33.35% (34.62–47.96 GHz) and achieves a realized gain of 6.25 dBi at 40 GHz.

关键词： 5G mobile communication Simulation Coplanar waveguides Broadband antennas Millimeter wave communication Wideband Substrates

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CompQoTE: Generalizing QoT Estimation with Composable ML and End-to-End Learning

CompQoTE: Generalizing QoT Estimation with Composable ML and...

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2023 Optical Fiber Communications Conference and Exhibition, OFC 2023

作者： Gao, Hanyu Chen, Xiaoliang Sun, Lu Li, Zhaohui Sun Yat-sen University Guangdong Provincial Key Labratory of Optoelectronic Information Processing Chips and Systems School of Electronics and Information Technology Guangzhou China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai China State Grid Information & Telecommunication Group Co. Ltd Beijing China

This paper proposes CompQoTE, a composable QoT estimation design with end-to-end learning capability. Results show CompQoT can generalize arbitrary lightpaths while achieving > 90% estimation accuracy for unseen li...

ISBN: (纸本)9781957171180

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Wideband L-Probe Fed Antenna-in-Package Module for Millimeter-Wave Radar

Wideband L-Probe Fed Antenna-in-Package Module for Millimete...

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IEEE Conference on Antenna Measurements & Applications (CAMA)

作者： Zheng Fang Kai Lu Nan Yang Shaoyong Zheng Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems School of Electronics and Information Technology Sun Yat-sen University Guangzhou China

ISBN: (数字)9798350386929

ISBN: (纸本)9798350350746

A wideband L-probe fed antenna-in-package ( $A$ iP) module for 60-GHz short-range radar applications is proposed in this work. This module comprises two close identical patch antennas, serving as the transmitter and the receiver. Each antenna element is a cavity-backed patch fed with an L-probe. The antenna module has a wide impedance bandwidth of 17.9 % (56.0-67.0 GHz) and stable radiation patterns across the operating band. By rotating both antennas by 45°, their mutual coupling level is significantly reduced. The $A$ iP module is evaluated through system-level simulation in a multi-target ranging scenario. A high level of range resolution can be obtained with this module, making it a good candidate for short-range millimeter-wave radar systems.

关键词： Antenna measurements Transmitters Patch antennas Antenna-in-package Millimeter wave radar Radar antennas Distance measurement Impedance Wideband Antenna radiation patterns

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Dual-Band Diversity Glass Antenna for WiFi Applications

Dual-Band Diversity Glass Antenna for WiFi Applications

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2023 Cross Strait Radio Science and Wireless Technology Conference, CSRSWTC 2023

作者： Hu, Peng Fei Leung, Kwok Wa School of Electronics and Information Technology Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems Sun Yat-sen University Guangzhou510006 China City University of Hong Kong State Key Laboratory of Terahertz and Millimeter Waves Department of Electrical Engineering Hong Kong Hong Kong Information and Communication Technology Centre CityU Shenzhen Research Institute Shenzhen518057 China

ISBN: (纸本)9798350358971

A dual-band polarization-diversity omnidirectional glass antenna is presented in this paper. A stepped glass dielectric resonator (DR) is fed by a probe and dual loops for vertical and horizontal polarizations, respectively. This antenna is designed in the 2.4 GHz and 5.8 GHz WiFi bands, with available bandwidths of 7.5% (2.31-2.49 GHz) and 6.5% (5.04-5.38 GHz). Two DR TM modes and two DR TE modes are used to obtain omnidirectional radiation patterns. © 2023 IEEE.

关键词： dielectric resonator antenna Glass antenna omnidirectional antenna

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Noise Shaping Enabled Signal Generation with Low-resolution Digital-to-Analog Converter in Optical Interconnects

Noise Shaping Enabled Signal Generation with Low-resolution ...

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IEEE Conference on Global Communications (GLOBECOM)

作者： Wei Wang Fan Li Mingzhu Yin Weihao Ni School of Electronics and Information Technology Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems Sun Yat-Sen University Guangzhou China

ISBN: (数字)9798350351255

ISBN: (纸本)9798350351262

Digital-to-analog converter (DAC) plays an important role in a communication system, which determines the quality of the generated signal. A high-resolution DAC is necessary to guarantee the system performance. However, the application of a high-resolution DAC results in high system cost and power consumption, which is incompatible with the future low-cost data centers. To be cost-effective and energy-efficient, a system with low-resolution DAC and negligible quantization noise induced performance degradation is highly desirable. Noise shaping (NS) technique is proposed to effectively suppress the quantization noise induced by low-resolution DAC. In this paper, we review the principle of the NS technique, and its effectiveness is investigated experimentally in 100 Gb/s intensity modulation and direct detection (IM/DD) PAM-4 system with low-resolution DAC. The experimental results show that the system with 4-bit DAC coupled with NS technique shows almost the same receiver sensitivity as the system with 8-bit DAC without NS technique over 2-km and 10-km single mode fiber (SMF) transmission in O-band. It indicates that significant performance improvement can be achieved by using NS technique in low-resolution DAC systems, and it is a promising solution for future low-cost data centers.

关键词： Data centers Quantization (signal) Optical interconnections Digital-analog conversion System performance Noise Energy efficiency Noise shaping Intensity modulation Signal resolution

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A Wideband Dielectric Resonator Antenna for Millimeter Wave Applications

A Wideband Dielectric Resonator Antenna for Millimeter Wave ...

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2023 Photonics and Electromagnetics Research Symposium, PIERS 2023

作者： Yang, Zhaofang Yang, Wenwen Tong, Mei Song Guo, Lei Dalian University of Technology Dalian China Nantong University Nantong China Tongji University Shanghai China Sun Yat-Sen University Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems Guangzhou China

ISBN: (纸本)9798350312843

A wideband millimeter-wave dielectric resonator (DR) antenna (DRA) is proposed for 5G applications. It consists of a rectangular DR with surrounding metallized holes. The simulated results show that the antenna can achieve a bandwidth of 50.2% (24.22-40.46 GHz). The DRA shows an average gain of 6.87 dBi with a maximum value of up to 11.78 dBi over the impedance bandwidth. It is also found that the broadside radiation patterns are very stable in the designed frequency band. © 2023 IEEE.

关键词： Microwave antennas

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Proportional-Integral Observer-Based PID control of Positive Switched systems

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Journal of systems Science and Complexity 2025年第3期38卷 1047-1071页

作者： Xing, Wei Zhou, Xiaoyue Zhang, Junfeng Jia, Xuan School of Information and Communication Engineering Hainan University Haikou570228 China Key Laboratory of System Control and Information Processing Ministry of Education Shanghai200240 China School of Automation Hangzhou Dianzi University Hangzhou310018 China

This paper presents a new proportional-integral-derivative control approach for positive switched systems based on a positive proportional-integral observer. First, a positive proportional-integral observer is constructed. By using the observer state, the proportional-integral-derivative control and the corresponding integral part are designed, respectively. Using 1-norm inequality, two dynamic event-triggering conditions are established for the proportional-integral observer and proportional-integral-derivative controller, respectively. A dynamic event-triggered proportional-integral observer-based dynamic event-triggered proportional-integral-derivative controller is proposed by combining the sample state and the integral of the weighted sample output estimation error. Under the designed event-triggering conditions, an interval system with upper and lower bounds is introduced. The positivity and 1-gain stability are achieved by realizing the according properties of the lower and upper bound systems in terms of multiple copositive Lyapunov function, respectively. All gain matrices are designed by a matrix decomposition approach and the corresponding conditions are solved by linear programming. Finally, two examples are provided to illustrate the validity of the results. © The Editorial Office of JSSC & Springer-Verlag GmbH Germany 2025.

关键词： Lower-upper decomposition

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Streaming-Data-Driven Multi-Objective Optimal Operation for Ammonia-based Integrated Energy Chemical systems: An Event-Triggered Scheme 42

Streaming-Data-Driven Multi-Objective Optimal Operation for ...

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42nd Chinese control Conference, CCC 2023

作者： Li, Longyan Ning, Chao Shanghai Jiao Tong University Department of Automation Shanghai200240 China East China University of Science and Technology Key Laboratory of Smart Manufacturing in Energy Chemical Process Ministry of Education Shanghai200237 China Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China

ISBN: (纸本)9789887581543

As an important component in the industry sector, the integrated energy chemical system is inescapably responsible for carbon reduction in addition to economic and reliability performance. We propose a novel streaming-data-driven multi-objective optimal operation for ammonia-based integrated energy chemical systems (AIECS). In the day ahead scheduling, a detailed mathematical model for AIECS is presented, upon which a multi-objective optimization considering cost, CO2 emission and reliability is established. For the intra-day operation, an event-triggered mechanism is firstly developed in the real-time operation of AIECS, and it enables the AIECS to be risk-aware just in time. By monitoring the difference between the predicted state of charge and the capacity limitations of battery, the AIECS identifies whether it is in hazardous regime. Then, the intelligent switch between certainty equivalence model predictive control and online-learning based distributionally robust model predictive control is proposed, such that their respective advantages are leveraged. Case studies demonstrate that the proposed approach guarantees the system safety, and brings good revenue. © 2023 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Model predictive control

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