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A Novel Monolithically Integrated Structure of GaN-based Micro-LED and its Driver HEMT

A Novel Monolithically Integrated Structure of GaN-based Mic...

China International Forum o Solid State Lighting: International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)

作者： Yuan An Kailin Ren Xueying Xiu Zebin Xu Zhuang Wu Luqiao Yin Jianhua Zhang School of Microelectronics Shanghai University Key Laboratory of Advanced Display and System Applications (Ministry of Education) Shanghai University Shanghai University Shanghai China

ISBN: (纸本)9781665495479

In this work, a novel LED-HEMT integrated device structure with a p-GaN cap layer under the drain electrode of HEMT and one or more InGaN layers inserted between AlGaN/GaN is proposed for the monolithic integration of GaN-based Micro-LED and its driver HEMT. This structure is a promising candidate for the optoelectronic switch in high-speed visible light communications owing to its elimination of metal-interconnects and reduction of parasitic capacitance. By TCAD simulations, the distribution of radiative recombination rate in this structure is investigated and the 2-D integrals of the radiative recombination rate for various device structure designs are compared. It is concluded that the integration structure with InGaN layers provides higher radiative recombination than that without InGaN layers. Device structure parameters are optimized, including Al content in AlGaN barrier layer, In content in InGaN layers, and thickness of InGaN layers.

关键词： Surface waves Photonic band gap Radiative recombination Switches HEMTs Wide band gap semiconductors Semiconductor process modeling

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DNN Task Assignment in UAV Networks: A Generative AI Enhanced Multi-Agent Reinforcement Learning Approach

arXiv

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arXiv 2024年

作者： Tang, Xin Chen, Qian Weng, Wenjie Liao, Binhan Wang, Jiacheng Cao, Xianbin Li, Xiaohuan Guangxi University Key Laboratory of Intelligent Networking and Scenario System School of Information and Communication Guilin University of Electronic Technology Guilin541004 China The College of Computing and Data Science Nanyang Technological University 639798 Singapore School of Architecture and Transportation Engineering Guilin University of Electronic Technology Guilin541004 China National Engineering Laboratory for Comprehensive Transportation Big Data Application Technology Guangxi Nanning530001 China College of Computing and Data Science Nanyang Technological University 639798 Singapore School of Electronic and Information Engineering The Key Laboratory of Advanced Technology of Near Space Information System Ministry of Industry and Information Technology of China Beihang University Beijing100191 China

Unmanned Aerial Vehicles (UAVs) possess high mobility and flexible deployment capabilities, prompting the development of UAVs for various application scenarios within the Internet of Things (IoT). The unique capabilities of UAVs give rise to increasingly critical and complex tasks in uncertain and potentially harsh environments. The substantial amount of data generated from these applications necessitates processing and analysis through deep neural networks (DNNs). However, UAVs encounter challenges due to their limited computing resources when managing DNN models. This paper presents a joint approach that combines multiple-agent reinforcement learning (MARL) and generative diffusion models (GDM) for assigning DNN tasks to a UAV swarm, aimed at reducing latency from task capture to result output. To address these challenges, we first consider the task size of the target area to be inspected and the shortest flying path as optimization constraints, employing a greedy algorithm to resolve the subproblem with a focus on minimizing the UAV’s flying path and the overall system cost. In the second stage, we introduce a novel DNN task assignment algorithm, termed GDM-MADDPG, which utilizes the reverse denoising process of GDM to replace the actor network in multi-agent deep deterministic policy gradient (MADDPG). This approach generates specific DNN task assignment actions based on agents’ observations in a dynamic environment. Simulation results indicate that our algorithm performs favorably compared to benchmarks in terms of path planning, Age of Information (AoI), energy consumption, and task load balancing. Copyright © 2024, The Authors. All rights reserved.

关键词： Motion planning

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An Optical Tracking system with Defaced Marker Detection 2021

An Optical Tracking System with Defaced Marker Detection

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2021 4th International Conference on Sensors, Signal and Image Processing

作者： Yu Qiu Zhao Zheng Ruidi Ou Xiaoming Hu Jingfan Fan Jian Yang Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and Photonics Beijing Institute of Technology China Key Laboratory of Convergence Medical Engineering System and Healthcare Technology School of Life Science Beijing Institute of Technology China

ISBN: (纸本)9781450385725

Optical tracking systems (OTSs) have been widely used in clinical practice to fulfill the high precision needs of contemporary surgery. The markers that are defaced in the production or surgery reduce the accuracy and tracking range of OTS. This effect was not considered in current products from either industry or academia. In this paper, we propose an OTS which can detect the defaced markers automatically. A stereo camera module is set to track surgical instruments by locating the markers affixed to them. An adaptive threshold approach is suggested to locate the markers. The typical fiducial localization error of our OTS reaches 0.28 mm, which is totally comparable to commercial devices. A defaced marker detection method based on the luminous energy model of OTS is proposed and can be used to recognize the defaced markers regardless of their relative positions to the OTS.

关键词： Defaced Marker Detection Optical Tracking system Surgical Instrument Tracking

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Brief Review of Silver Sinter-bonding Processing for Packaging High-temperature Power Devices

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Chinese Journal of Electrical Engineering 2020年第3期6卷 25-34页

作者： Haidong Yan Peijie Liang Yunhui Mei Zhihong Feng School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyGuilin 541004China Guangxi Key Lab of Manufacturing System and Advanced Manufacturing Technology Guilin 541004China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education Guilin 541004China National Key Lab of Application Specific Integrated Circuit Hebei Semiconductor Research InstituteShijiazhuang 050051China

Silver sintering is receiving increasing attention due to its novel die-attach technique for high-temperature power *** thermal conductivity,high melting point/remelting temperature and low-temperature sintering behaviors of the silver sintered attachment meet the requirements of high-temperature applications for power devices,specifically SiC *** merits and demerits of the existing pressure-assisted sintering and pressure-less sintering techniques using nano-scale,micro-scale and micro-nano-scale hybrid silver sintered materials are separately *** emerging rapid sintering approaches,such as the electric-assisted approach,are briefly introduced and the technical outlook is *** addition,the study highlights the importance of creating a brief resource guide on using the correct sintering methods.

关键词： Pressure-less sintering pressure-assisted nanosilver paste high-temperature power module insulated gate bipolar translators(IGBT) silicon carbide(SiC)

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Adaptive Backdoor Attacks with Reasonable Constraints on Graph Neural Networks

arXiv

引用

arXiv 2025年

作者： Dong, Xuewen Li, Jiachen Li, Shujun You, Zhichao Qu, Qiang Kholodov, Yaroslav Shen, Yulong School of Computer Science and Technology Xidian University The Engineering Research Center of Blockchain Technology Application and Evaluation Ministry of Education China The Shaanxi Key Laboratory of Blockchain and Secure Computing Xi’an710071 China University of Kent CanterburyCT2 7NP United Kingdom Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences China Intelligent Transportation Systems Lab Innopolis University Innopolis Russia School of Computer Science and Technology Xidian University China The Shaanxi Key Laboratory of Network and System Security Xi’an710071 China

Recent studies show that graph neural networks (GNNs) are vulnerable to backdoor attacks. Existing backdoor attacks against GNNs use fixed-pattern triggers and lack reasonable trigger constraints, overlooking individual graph characteristics and rendering insufficient evasiveness. To tackle the above issues, we propose ABARC, the first Adaptive Backdoor Attack with Reasonable Constraints, applying to both graph-level and node-level tasks in GNNs. For graph-level tasks, we propose a subgraph backdoor attack independent of the graph’s topology. It dynamically selects trigger nodes for each target graph and modifies node features with constraints based on graph similarity, feature range, and feature type. For node-level tasks, our attack begins with an analysis of node features, followed by selecting and modifying trigger features, which are then constrained by node similarity, feature range, and feature type. Furthermore, an adaptive edge-pruning mechanism is designed to reduce the impact of neighbors on target nodes, ensuring a high attack success rate (ASR). Experimental results show that even with reasonable constraints for attack evasiveness, our attack achieves a high ASR while incurring a marginal clean accuracy drop (CAD). When combined with the state-of-the-art defense randomized smoothing (RS) method, our attack maintains an ASR over 94%, surpassing existing attacks by more than 7%. Copyright © 2025, The Authors. All rights reserved.

关键词： Graph neural networks

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Cross-Domain Cooperative Technology of Intelligent Unmanned Swarm systems: Current Status and Prospects

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Strategic Study of CAE 2024年第1期26卷 117-126页

作者： Jiang, Bitao Wen, Guanghui Zhou, Jialing Zheng, Dezhi Satellite Information Intelligent Processing and Application Research Laboratory Beijing100192 China School of Mathematics Southeast University Nanjing211189 China Advanced Research Institute of Multidisciplinary Sciences Beijing Institute of Technology Beijing100081 China State Key Laboratory for Air-Ground Integrated Navigation System and Technology Beijing100081 China

As intelligent technologies and unmanned systems develop rapidly, the concept of cross-domain cooperative technology of intelligent unmanned swarm systems has emerged, received widespread attention, and gradually become the high ground in the competition of unmanned system technologies among countries worldwide. Based on the development demand for the cross-domain cooperative technology of intelligent unmanned swarm systems in China, this study summarizes the research status of the cross-domain cooperative technology in typical unmanned scenarios such as sea - air, air - ground, and sea - ground/sea - ground - air, and thoroughly analyzes the current status, technological demand, and key research directions of the technology. Additionally, countermeasures and suggestions are proposed to promote the steady and rapid development of the cross-domain cooperative technology from the perspectives of overall concept, system architecture, theoretical innovation, and technological breakthroughs, with the aim of facilitating the sustained development of unmanned systems in China. © 2024 Beijing Zhongguo Gongcheng Kexue Zazhishe. All rights reserved.

关键词： Engineering education

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A Z-scheme heterojunction of ZnO/CDots/C_(3)N^(4) for strengthened photoresponsive bacteria-killing and acceleration of wound healing

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Journal of Materials Science & Technology 2020年第22期54卷 1-11页

作者： Yiming Xiang Qilin Zhou Zhaoyang Li Zhenduo Cui Xiangmei Liu Yanqin Liang Shengli Zhu Yufeng Zheng Kelvin Wai Kwok Yeung Shuilin Wu Hubei Key Laboratory of Polymer Materials Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional MaterialsSchool of Materials Science&EngineeringHubei UniversityWuhan 430062China The Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China School of Materials Science&EngineeringTianjin UniversityTianjin 300072China Department of Orthopaedics&Traumatology Li KaShing Faculty of MedicineThe University of Hong KongPokfulamHong Kong999077China State Key Laboratory for Turbulence and Complex System and Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China

The abuse of antibiotics is leading to the emergence of resistant *** this work,a drug-free composite of ZnO/CDots/g-C3N4 with Z-scheme heterojunction was developed,which was employed to kill bacteria effectively within a very short time under the irradiation of visible light due to the enhanced photocatalytic and photothermal *** this system,the CDots acted as a bridge between g-C3N4 and ZnO,effectively inhibiting the recombination of photo-generated electrons with holes and consequently enhancing the photocatalytic *** addition,CDots endowed the system with excellent photothermal *** a result,the antibacterial efficacy of ZnO/CDots/g-C3N4 composite against *** and *** reached up to 99.97%and 99.99%respectively,after 15 min of visible light irradiation,due to the synergistic action of photo-inspired radical oxygen species and *** Zn ions released from the composite promoted the growth of fibroblasts,which accelerated the wound healing process.

关键词： Heterostructure Z-scheme Antibacterial Wound healing g-C3N4

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Photoresponses Improvement of ZnO Thin Film Transistor by Using a HfO2-Al2O3 Double Dielectrics

Photoresponses Improvement of ZnO Thin Film Transistor by Us...

引用

International Conference on (ICEPT) Electronic Packaging Technology

作者： Bowen Che Yongpeng Zhang Xingwei Ding Key Laboratory of Advanced Display and System Application Ministry of Education (Shanghai University) School of Mechatronics and Automation (Shanghai University) Shanghai China

ISBN: (数字)9781728168265

ISBN: (纸本)9781728168272

In this work, we have fabricated two bottom-gate zinc oxide thin film transistors (TFTs) with single-layer HfO 2 and double-layer HfO 2 -Al 2 O 3 dielectrics by atomic layer deposition (ALD). The TFT with HfO 2 -Al 2 O 3 dielectric exhibited better electrical characteristics, such as a higher field effect mobility of 6.1 cm 2 /V·s and a lower subthreshold swing of 0.124 V/decade. At the same time, the optical properties is also improved significantly with larger responsivity (6.05 A/W) and UV-to-visible rejection ratio (6.05×10 4 ). These results are attributed to lower interface trap states between channel layer and dielectric layer by an Al 2 O 3 interlayer.

关键词： Hafnium compounds Dielectrics Zinc oxide Thin film transistors II-VI semiconductor materials Aluminum oxide Logic gates

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Detection of N-Propanol Down to Sub-Ppm Level Using P-Type Delafossite AgCrO2 Nanoparticles

SSRN

引用

SSRN 2022年

作者： Li, Wentao Kong, Lingwei Li, Xifeng Zhu, Wenhuan Zhang, Jianhua Liu, Hai Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University 149 Yanchang Road Shanghai200072 China Department of Micro/Nano Electronics School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China

As an important biomarker of lung cancer, n-propanol at sub-ppm level is still challenging to be detected for a simple and immediate early diagnose. In this work, a new n-propanol gas sensor with an ultralow detection limit down to 100 ppb is presented using AgCrO2 nanoparticles synthesized by a simple hydrothermal method. Compared with the congeneric CuCrO2 and commercial SnO2 , AgCrO2 exhibits prevailing performances, including a higher selectivity, dynamic response, logarithmical linearity, but lower working temperature. The first principles calculation and the energy band theoretical analysis are combined to elucidate the sensing mechanism, in which the chemical adsorption of gaseous molecules to the silver followed by the dehydrogenation on chromium on the surface of AgCrO2 is responsible to the outstanding susceptibility towards n-propanol. The proposed metal oxide semiconductor gas sensor capable of sub-ppm n-propanol detection provides a route to design and optimize the sensitive material system for the advanced trace detection of the volatile organic compounds. © 2022, The Authors. All rights reserved.

关键词： Volatile organic compounds

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Management of Exciton Recombination Zone and Energy Loss for 4cztpn-Based Organic Light-Emitting Diodes Via Engineering Hosts

SSRN

引用

SSRN 2022年

作者： Tang, Zongkai Lü, Zhaoyue Zheng, Yanqiong Wang, Junling School of Physics East China University of Science & Technology Shanghai200237 China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai200072 China Basic Department Army Academy of Armored Forces Beijing100072 China

The exciton recombination zone and energy loss of organic light-emitting diodes (OLEDs) with thermally activated delayed fluorescence (TADF) emitter 4CzTPN (1, 2, 4, 5-Tetrakis(carbazol-9-yl)-3, 6-dicyanobenzene) as the dopant are explored by engineering hosts. The results demonstrate that the exciton recombination zone is determined by the matching condition between hole and electron mobility of hosts. The shift of the recombination zone from cathode to anode side induces a blue-shift of the electroluminescent spectra. And energy loss can be reduced by well-matched carrier mobility and TADF feature of host as well as lower energy level offset between host and guest. Specifically, the exciplex-co-hosted device delivers the maximum current/power efficiency/external quantum efficiency of 29.06 cd·A–1/28.89 lm·W–1/8.86%, respectively, enhanced by more than 50% than the single-component-hosted devices. This study illuminates that controlling exciton recombination zone and energy loss via engineering hosts is a feasible strategy for developing high performance TADF OLEDs. © 2022, The Authors. All rights reserved.

关键词： Energy dissipation

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