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7th IEEE International Symposium on Electromagnetic Compatibility, ISEMC 2023

作者： Chen, Xiaoxue Li, Shangyuan Xue, Xiaoxiao Zheng, Xiaoping Tsinghua University Beijing National Research Center for Information Science and Technology Department of Electronic Engineering Beijing China

ISBN: (纸本)9798350333107

In this paper, we perform a field trial test of a photonic-based full K-band phased array radar system demonstrator in a real scenario. The actual implementation of the system employs the broadband photonic beam processor as the receiver which has been previously verified enabling the all-optical multifunction integrated receive. The feasibility in practical applications is further proved by the experimental results with observation of the non-cooperative target inside the beam region, i.e. a moving unmanned aerial vehicle in practice here. © 2023 IEEE.

关键词： Beamforming

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NI-MAC: MAC Protocol Design for Neural Interfaces

NI-MAC: MAC Protocol Design for Neural Interfaces

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2023 IEEE International Conference on E-Health Networking, Application and Services, Healthcom 2023

作者： Wu, Hongbo Jia, Yukuan Zhou, Sheng Niu, Zhisheng Tsinghua University Beijing National Research Center for Information Science and Technology Department of Electronic Engineering Beijing China

ISBN: (纸本)9798350302301

Neural interfaces play a crucial role in biomedical engineering since they serve as pathways of communication linking the brain and computers. Integrating wireless neural interfaces with a Media Access Control (MAC) protocol presents an efficient method for recording and analyzing neural activities simultaneously from multiple sensor nodes. However, current wireless networks, such as Wireless Sensor Networks (WSNs) and Wireless Body Area Networks (WBANs), are not directly applicable to neural interface networks, due to the high complexity and weak priority access support. This paper proposes a MAC protocol called NI-MAC that not only includes priority access but also simplifies the superframe structure and frame formats. Both random access and managed access are included in the superframe design. Analysis of transmission latency and energy consumption shows the improvement over IEEE 802.15.4 and IEEE 802.15.6. With NS3 simulator, we compare the proposed NI-MAC with existing protocols and demonstrate that: Transmission latency of high-priority data can achieve 12ms, while under IEEE 802.15.4 it is 22ms;as the number of access nodes increases, energy consumption is reduced by up to 50% compared to IEEE 802.15.6. © 2023 IEEE.

关键词： Medium access control

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Adaptive Quantized and Normalized MSA and Its Application for DTMB-A LDPC Codes

Adaptive Quantized and Normalized MSA and Its Application fo...

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2023 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB 2023

作者： An, Xia Zhang, Chao Peng, Kewu He, Zhitong Song, Jian Tsinghua University Beijing National Research Center for Information Science and Technology Department of Electronic Engineering Beijing China

ISBN: (纸本)9798350321524

In practical implementation, the input and intermediate signals of Low-Density Parity-Check (LDPC) message passing decoders are quantized into fixed-point messages with finite bit-width. The quantization operation with limited bit-width enhances the data throughput and reduces the computation and storage overhead of LDPC decoder, but confronts the problem of performance degradation. Existing improved algorithms of min-sum algorithm (MSA) generally do not consider the effect of quantization, and thus lack the optimization of the quantization strategy. To fill this gap, we first propose adaptive asymmetric quantization strategy. Then, based on the proposed quantization strategy, combined with conventional adaptive normalization technique, we propose adaptive quantized and normalized MSA (AQNMSA), which significantly alleviates the performance degradation of fixed quantized and normalized MSA (NMSA) with negligible increment of computational complexity. Concurrently, we provide a novel look-up table design algorithm for AQNMSA based on the tool of multi-edge-type density evolution (MET-DE). Finally, we apply AQNMSA to DTMB-A LDPC codes with a very low quantization bit-width of 4 bits, and observe a superior threshold performance and lower error floor compared with its non-adaptive float-point counterparts. © 2023 IEEE.

关键词： Message passing

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Correcting on-chip distortion of control pulses with silicon spin qubits

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Chinese Physics B 2025年第1期34卷 265-271页

作者： Ming Ni Rong-Long Ma Zhen-Zhen Kong Ning Chu Wei-Zhu Liao Sheng-Kai Zhu Chu Wang Gang Luo Di Liu Gang Cao Gui-Lei Wang Hai-Ou Li Guo-Ping Guo CAS Key Laboratory of Quantum Information University of Science and Technology of China(USTC)Hefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Integrated Circuit Advanced Process Research and Development Center Institute of MicroelectronicsChinese Academy of Sciences(CAS)Beijing 100029China Hefei National Laboratory Hefei 230088China Beijing Superstring Academy of Memory Technology Beijing 100176China Origin Quantum Computing Company Limited Hefei 230026China

In semiconductor quantum dot systems,pulse distortion is a significant source of coherent errors,which impedes qubit characterization and ***,we demonstrate two calibration methods using a two-qubit system as the detector to correct distortion and calibrate the transfer function of the control *** methods are straightforward to implement,robust against noise,and applicable to a wide range of qubit *** two methods differ in correction accuracy and *** first,coarse predistortion(CPD)method,partially mitigates *** second,all predistortion(APD)method,measures the transfer function and significantly enhances exchange oscillation *** methods use exchange oscillation homogeneity as the metric and are suitable for any qubit driven by a diabatic *** believe these methods will enhance qubit characterization accuracy and operation quality in future applications.

关键词： quantum computation quantum dot pulse distortion

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Terahertz Radiation Generated from Graphene Hyperbolic Metamaterial

Terahertz Radiation Generated from Graphene Hyperbolic Metam...

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2023 Opto-electronics and Communications Conference, OECC 2023

作者： Li, Tianchang Liu, Fang Huang, Yidong Tsinghua University Beijing National Research Center for Information Science and Technology Department of Electronic Engineering Beijing China

We demonstrate an on-chip terahertz emitter based on Cherenkov radiation in terahertz band generated in graphene-based hyperbolic metamaterials. Terahertz radiation with power of 60-100nW at 8THz is observed experimen... 详细信息

ISBN: (纸本)9781665462136

关键词： Metamaterials

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Masked hybrid attention with Laplacian query fusion and tripartite sequence matching for medical image segmentation

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Neural Computing and Applications 2025年第8期37卷 5891-5911页

作者： Ekong, Favour Yu, Yongbin Patamia, Rutherford Agbeshi Sarpong, Kwabena Ukwuoma, Chiagoziem C. Wang, Xiangxiang Ukot, Akpanika Robert Cai, Jingye School of Information and Software Engineering University of Electronic Science and Technology of China Sichuan Chengdu611731 China College of Nuclear Technology and Automation Engineering Chengdu University of Technology Sichuan Chengdu610059 China Sichuan Engineering Technology Research Center for Industrial Internet Intelligent Monitoring and Application Chengdu University of Technology Sichuan Chengdu610059 China

Medical image segmentation is pivotal in computer-aided diagnosis systems, demanding high precision and contextual understanding. Vision Transformer-based approaches have gained much attention recently due to their excellent performance and ability to capture long-range dependencies in medical images. However, research shows they suffer from inadequate multi-scale feature integration, poor object localization, and inconsistent mask predictions, leading to sub-optimal segmentation performance. This paper addresses these challenges by redefining semantic medical image segmentation through learnable object queries within an enhanced transformer framework with a masked hybrid attention querying mechanism, optimizing multi-scale feature fusion, object localization, and instance-specific segmentation. First, this study presents a novel transformer-based masked hybrid attention mechanism using Laplacian query fusion on learnable query features and incorporating a novel tripartite sequence matching technique as part of the enhanced decoder block to improve the consistency of mask predictions and optimize decoder queries. The designed hybrid multi-head self- and cross-attention mechanisms aim to selectively integrate multi-scale features, ensuring optimal feature combinations for precise segmentation. Secondly, multiple class tokens are incorporated to improve object localization and capture class-specific characteristics within the transformer framework, leveraging the transformer decoders’ ability to learn distinct instance representations. Experimental results and extensive ablation studies demonstrate the effectiveness of the proposed approach on three publicly available datasets, obtaining better segmentation results compared to various state-of-the-art approaches using various evaluation metrics. Specifically, the proposed model achieves a Dice Score of 95.25%, 92.75%, and 85.25% on LUNA, ISIC, and DRIVE datasets, respectively. © The Author(s), under exclusive licence

关键词： Laplace transforms

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Photonic-Assisted Enhanced Ranging System Based on QPSK Modulation 7

Photonic-Assisted Enhanced Ranging System Based on QPSK Modu...

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7th IEEE International Symposium on Electromagnetic Compatibility, ISEMC 2023

作者： Li, Guangyuan Li, Shangyuan Xue, Xiaoxiao Zheng, Xiaoping Tsinghua University Beijing National Research Center for Information Science and Technology Department of Electronic Engineering Beijing China

ISBN: (纸本)9798350333107

In this paper, we propose a ranging signal demodulation system scheme based on microwave photon technology, which is different from traditional BPSK pseudo-random signal modulation method. This system fully utilizes the orthogonality of channel I and channel Q in Quadrature Phase Shift Keying (QPSK) signal, and achieves dual pseudo-random code ranging through orthogonal demodulation of the echoes. This improves the signal-to-noise ratio by 3dB after autocorrelation operation, which helps to improve the radar target detection probability and ranging accuracy. © 2023 IEEE.

关键词： Quadrature phase shift keying

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Broadband Ultra-low thermal sensitivity Silicon Nitride Mach-Zehnder Interferometer Filters

Broadband Ultra-low thermal sensitivity Silicon Nitride Mach...

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2024 Asia Communications and Photonics Conference, ACP 2024 and International Conference on information Photonics and Optical Communications, IPOC 2024

作者： Zhou, Zhiyuan Tang, Zihao Wang, Kaiyuan Zhang, Ruigang Lai, Yaxiao Zheng, Shuang Zhang, Minming School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China Caliopa Lab of Belgium Research Centre Huawei Technologies Research & Development Ltd. Gent9000 Belgium

We demonstrate broadband ultra-low thermal sensitivity filters showing less than 1 pm/°C wavelength shift from 25°C to 85°C, over a wavelength range of 100 nm both in O and C *** properties of the fabri... 详细信息

ISBN: (纸本)9798350379266

关键词： Silicon nitride

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Low-loss beam synthesizing network based on Epsilon-near-zero(ENZ)medium for on-chip antenna array

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Chip 2023年第2期2卷 44-52页

作者： Hao Li Ziheng Zhou Yongzhi Zhao Yue Li Department of Electronic Engineering Tsinghua UniversityBeijing 100084 The College of Physics and Information Engineering Fuzhou UniversityFuzhou 350108China Hebei Semiconductor Research Institute Shijiazhuang 050000China Beijing National Research Center for Information Science and Technology Beijing 100084

Beam synthesizing antenna arrays are essentially demanded for on-chip millimeter wave and terahertz *** order to achieve a par-ticular radiation beam,specific amplitude and phase distributions are required for all the array elements,which is conventionally realized through a properly designed feeding *** the current work,a low-loss feeding network design approach based on epsilon-near-zero(ENZ)medium was proposed for large-scale antenna arrays with different beam *** to the infinite wavelength within the ENZ medium,a newly-discovered stair-like resonant mode was adopted for assigning a uniform phase distribution to each element,while the amplitudes and positions of these elements were optimized for generating particular *** implement the design philosophy in a low-loss manner,a hollow air-filled waveguide near cutoff fre-quency was employed to emulate the ENZ medium,and the bulk sil-icon microelectromechanical systems(MEMS)micromachining tech-nology was utilized for chip-scale *** a specific example,a low-sidelobe antenna array at 60.0 GHz was designed,which realized an impedance bandwidth of 2.57%,a gain of 13.6 dBi and a sidelobe level as low as-20.0 dB within the size of 0.5×3.4λ_(0)(2).This method is also compatible with a variety of applications,such as the high-directivity antenna array,non-diffractive Bessel beam antenna array,and so *** on this innovative concept of applying ENZ medium to the on-chip antenna array,it shows the advantages of simple struc-ture and low loss for on-chip beam synthesis without complex lossy feeding networks.

关键词： Epsilon-near-zero medium Millimeter wave antenna array On-chip antenna Beam synthesis

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Management, Storage, and Retrieval of Complex Data Comprising Multiple Formats Collected from Different Sources: A Systems Engineering Approach

Management, Storage, and Retrieval of Complex Data Comprisin...

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2023 Congress in Computer Science, Computer Engineering, and Applied Computing, CSCE 2023

作者： White, Barry C. Patel, Reena R. Walker, LaKenya K. Bray, Matthew D. Usace Engineering Research and Development Center Information Technology Laboratory VicksburgMS United States Usace Engneering Research and Development Center Geotechnical and Structures Laboratory VicksburgMS United States

ISBN: (纸本)9798350327595

Physical modeling procedures, with intermediate data, are being developed for the large-scale generation of synthetic imagery for automated target recognition (ATR) machine learning (ML) algorithms. This imagery is typically combined with collected data for generating robust training sets. The management and retrieval of this data requires large-scale storage and a means to query data of different types. Queries need to be performed for selection of data sets to the single file. The goal of this study is the creation of managed system for storing and retrieving this information using high-performance computing resources with the integrated Rule Oriented Data System (iRODS). Search oriented metadata tags are created for query searches based on locality, time-of-day, and other factors. When possible, metadata generation will be automated based on information in the data file. Use cases for the import and query operations are created. Simple scalable problems have been processed and are presented for this data set procedure and the proposed architecture is presented. This data storage and retrieval system will serve to provide locality specific data for ATR ML data-sets from a large set of collected and synthetic imagery and the processes to create that imagery. © 2023 IEEE.

关键词： ATR big data data lake infrared imagery iRODS machine learning

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