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Nanowires mediated growth ofβ-Ga_(2)O_(3)nanobelts for hightemperature(>573 K)solar-blind photodetectors

Nano Research 2023年第4期16卷 5548-5554页

作者： Xiaobin Zou Dongyu Xie Yong Sun Chengxin Wang State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Optoelectronic Materials and Technologies and Guangdong Province Key Laboratory of Display Material and Technology School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China

β-Ga_(2)O_(3),with ultra-wide bandgap,high absorption coefficient for high-energy ultraviolet(UV)photons,and high structural stability toward harsh-environment,has been receiving persistent attention for deep ultraviolet photodetectors ***,realization of devices with high tolerance toward high temperature faces great challenges due to considerable background signals mainly arising from abundant thermal excited ***,nanowire-mediated high-qualityβ-Ga_(2)O_(3)nanobelts with ultra-thin thickness and length up to several hundred micrometers were achieved via a simple catalyst-free chemical vapor deposition *** resulted microdevice output superior optoelectric figure of merits among numerous reports aboutβ-Ga_(2)O_(3),i.e.,ultra-low dark current(below the detection limit of 10−12 A),high responsivity(1,320 A/W),and high spectral selectivity working under low voltage(~2 V).More importantly,the performance remains robust at elevated temperature higher than 573 *** results indicate a large prospect for low-voltage driven deep ultraviolet photodetectors with good sensitivity and stability at harsh environments.

关键词： β-Ga_(2)O_(3) low-dimensional nanostructures chemical vapor deposition high temperature photodetectors solar-blind photodetectors

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A Novel Approach for Image Encryption with Chaos-RNA

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Computers, Materials & Continua 2023年第10期77卷 139-160页

作者： Yan Hong Shihui Fang Jingming Su Wanqiu Xu Yuhao Wei Juan Wu Zhen Yang State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine Anhui University of Science and TechnologyHuainan232001China School of Electrical and Information Engineering Anhui University of Science and TechnologyHuainan232001China School of Information Science and Engineering Henan University of TechnologyZhengzhou450001China

In today’s information society,image encryption technology is crucial to protecting Internet ***,traditional image encryption algorithms have problems such as insufficient chaotic characteristics,insufficient randomness of keys,and insecure Ribonucleic Acid(RNA)*** address these issues,a chaos-RNA encryption scheme that combines chaotic maps and RNA encoding was proposed in this *** initial values and parameters of the chaotic system are first generated using the Secure Hash Algorithm 384(SHA-384)function and the plaintext ***,the Lühyperchaotic system sequence was introduced to change the image’s pixel values to realize block scrambling,and further disturbance is achieved through spiral index sequence to enhance encryption ***,to obtain the final encrypted image,the diffusion is accomplished through different RNA encoding rules and operation rules corresponding to the chaotic sequence generated by an improved one-dimensional chaotic map(1DCM).Here innovatively propose four new RNA operation rules,increasing the difficulty of *** results demonstrate that the normalized pixel change rate(NPCR)and the unified average changed intensity(UACI)values of the tested encrypted images were 99.61%and 33.46%,*** average ciphertext entropy value in the Red Green Blue(RGB)channels were 7.9986,7.991,and ***,this algorithm exhibits a low correlation coefficient and enhanced *** encryption method effectively improves the security and reliability of image encryption compared to other similar techniques.

关键词： Chaos-RNA SHA-384 Lühyperchaotic system block scrambling RNA diffusion

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Turbulent heat fluxes in the North Water Polynya and ice estimated based on ASRv2 data and their impact on cloud

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Advances in Climate Change Research 2024年第5期15卷 798-814页

作者： Hai-Yi REN Mohammed SHOKR Tian-Yu ZHANG Zhi-Lun ZHANG Feng-Ming HUI Xiao CHENG School of Geospatial Engineering and Science Sun Yat-sen UniversitySouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China Key Laboraory of Comprehensive Obseration of Polar Environment(Sun Yat-en University)Minisry of Education Zhuhai 519082 China State Key Laboratory of Remote Sensing Science Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China State Key Laboratory of Space-Ground Integrated Information Technology Beijing Institute of Satllite Information Engineering Beijing 100086China Science and Technology Branch Environment CanadaToronto Ontario M3H5T4Canada

The presence or absence of sea ice introduces a substantial perturbation to surface-atmosphere energy *** the effect of varying sea ice cover on surface-atmosphere interactions is an important consideration for understanding the Arctic climate *** recurring North Water Polynya(NOW)serves as a natural laboratory for isolating cloud responses to a rapid,near-step perturbation in sea *** this study,we employed high-resolution Arctic system Reanalysis version 2(ASRv2)data to estimate turbulent heat fluxes over the NOW and nearby sea ice(NSI)area between 2005/2006 and 2015/*** results indicate that the average turbulent heat fluxes in the polynya are about 87%and 86%higher than in the NSI area over the 10 years during the entire duration of the polynya and during polar night,*** turbulent heat fluxes from the polynya tend to produce more low-level *** relationship between the polynya and low cloud in winter was examined based on Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations(CALIPSO).The low-cloud fraction(0-2 km)was about 7%-34%larger over the polynya than the NSI area,and the ice water content below 200 m was about 250%-413%higher over the former than the *** correlation between cloud fraction and turbulent heat fluxes in the polynya peaks around the altitude of 200-300 *** results suggest that the NOW affects the Arctic boundary layer cloudiness and structure in ***,higher horizontal resolution reanalysis data can advance our understanding of the cloud-polynya response.

关键词： The North Water Polynya Turbulent heat fluxes Cloud cover Ice water content ASRv2 CALIPSO

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SGAN-RL: Fusion classification method for network intrusion detection based on data augmentation

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Journal of Intelligent and Fuzzy systems 2025年第4期48卷 569-583页

作者： Li, Lining Liu, Shuai Ren, Rong Wu, Lianhai Wang, Qian Zhang, Bing College of Computer Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing China School of Information Science and Engineering Yanshan University P.R. Qinhuangdao China The Key Laboratory of Software Engineering Yanshan University Qinhuangdao China

Although traditional research methods for intrusion detection can effectively prevent and mitigate issues such as data leaks to avoid severe consequences, existing intrusion detection technologies encounter limitations, including low classification accuracy and high false positive rates, particularly when dealing with high-dimensional, complex network anomaly traffic data. Additionally, the common problem of class imbalance in intrusion detection datasets exacerbates these challenges. This paper introduces a novel approach to network intrusion detection classification, termed SGAN-RL, which integrates ResNet and LSTM models based on the semi-supervised generative adversarial network (SGAN) framework. This method utilizes SGAN to generate synthetic data resembling real intrusion detection data and continually trains the discriminator to produce high-quality data, thereby enhancing data distribution balance and quality. Moreover, a fusion intrusion detection classification model is presented, leveraging the strengths of ResNet and LSTM architectures to capture spatial and temporal features, respectively. This synergistic fusion enhances the model’s capacity for comprehensive data representation, resulting in improved performance in intrusion detection data classification tasks. Experiments conducted on intrusion detection datasets NSL-KDD, UNSW-NB15, and CIC-IDS2017 demonstrate that the proposed model enhances accuracy, precision, recall, F1-score, ROC-AUC, PR-AUC, respectively, showcasing its robust performance and reliability in network intrusion detection classification. © 2025 – IOS Press. All rights reserved.

关键词： Network intrusion

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Rare earth lanthanum pinning effect for corrosion resistance ultraefficient microwave absorption FeCo@rGO composites

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Journal of Materials science & technology 2024年第10期177卷 181-190页

作者： Junru Yao Jintang Zhou Lu Lu Feng Yang Zhengjun Yao Bo Ouyang Erjun Kan Yuxin Zuo Renchao Che Fan Wu College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Ministry of Industry and Information Technology Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics)Nanjing 211100China MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing School of ScienceNanjing University of Science and TechnologyNanjing 210094China School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsDepartment of Materials ScienceFudan UniversityShanghai 200438China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China

Magnetic metal absorbers exhibit remarkable microwave absorption ***,their practical application is severely limited due to their susceptibility to corrosion,particularly in marine *** address this challenge,we propose a novel approach involving the modification and control of FeCo/rGO microwave absorbers using rare earth lanthanum(La).This strategy aims to achieve both high-performance microwave absorption and enhanced resistance to marine *** this study,we employ a La_(2)O_(3) modifying control strategy to refine the FeCo magnetic particles and coat them with CoFe_(2)O_(4) on the surface,leveraging the pinning effect of in situ generated La_(2)O_(3) .This process enhances the interface polarization of the absorbers,thereby improving their electromagnetic performance and ma-rine corrosion ***,the La_(2)O_(3) modified FeCo@rGO composites exhibit broadband ab-sorption,covering a wide frequency range of 6.11 GHz at 1.55 ***,the electromagnetic proper-ties of the La_(2)O_(3) modified FeCo@rGO absorbers remain stable even after prolonged exposure to a 3.5 wt% NaCI solution,simulating marine conditions,for at least 15 ***,we perform first-principle calculations on FeCo and FeCo-O to validate the corrosion resistance of the La_(2)O_(3) modified FeCo@rGO composites at the atomic *** comprehensive investigation explores the control of rare earth lan-thanum modification on the size of magnetic metal particles,enabling efficient electromagnetic wave absorption and marine corrosion *** results of this study provide a novel and facile strategy for the control of microwave absorbers,offering promising prospects for future research and development in this field.

关键词： Rare earth lanthanum FeCo@rGO Microwave absorption Marine corrosion resistance

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Modeling and Simulation of PV Parallel Arrays under Multiple Illuminations 13

Modeling and Simulation of PV Parallel Arrays under Multiple...

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13th IEEE Data Driven Control and Learning systems Conference, DDCLS 2024

作者： Xiao, Wenwen Dong, Na He, Kesen Mai, Xiaoming School of Electrical and Information Engineering Tianjin University Tianjin Key Laboratory of Intelligent Unmanned Swarm Technology and System Tianjin China

ISBN: (纸本)9798350361674

Building-integrated photovoltaics (BIPV) provide great flexibility for energy conservation and emission reduction. However, uneven illumination distribution can result in multi-peak characteristics, negatively impacting the system's efficiency. Therefore, it is crucial to establish a photovoltaic (PV) cell model that is adaptable to environmental changes. The existing wildly-used seven-parameter circuit model faces big challenges in real engineering applications due to its unmatched parameters to the ones provided by manufactures. To address this issue, this study utilizes the maximum power point matching method and investigates parameter optimizations, including photocurrent (Ipv), reverse saturation current (Io), as well as ideality factor (A). An optimized seven-parameter model is established and the output characteristics of two different kinds of PV panels are presented. To maximize the output power, it is necessary to optimize the array configuration. Based on the enhanced even-parameter model, this paper does in-depth investigations on the maximum output of the six typical structures under three typical shading patterns, which are Series-Parallel (SP), Bridge-Linked (BL), Total-Cross- Tied (TCT), Honey-Comp (HC), Long Strings (LS), and Multi Strings (MS). The research findings will contribute to the selection of the optimal structure for PV arrays under various shading scenarios. © 2024 IEEE.

关键词： Energy conservation

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Three-Branch BERT-Based Text Classification Network for Gastroscopy Diagnosis Text

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International Journal of Crowd science 2024年第1期8卷 56-63页

作者： Wang, Zhichao Zheng, Xiangwei Zhang, Jinsong Zhang, Mingzhe School of Information Science and Engineering Shandong Normal University Jinan250358 China State Key Laboratory of High-end Server & Storage Technology Jinan250013 China

During a hospital visit, a significant volume of Gastroscopy Diagnostic Text (GDT) data are produced, representing the unstructured gastric medical records of patients undergoing gastroscopy. As such, GDTs play a crucial role in evaluating the patient’s health, shaping treatment plans, and scheduling follow-up visits. However, given the free-text nature of GDTs, which lack a formal structure, physicians often find it challenging to extract meaningful insights from them. Furthermore, while deep learning has made significant strides in the medical domain, to our knowledge, there are not any readily available text-based pre-trained models tailored for GDT classification and analysis. To address this gap, we introduce a Bidirectional Encoder Representations from Transformers (BERT) based three-branch classification network tailored for GDTs. We leverage the robust representation capabilities of the BERT pre-trained model to deeply encode the texts. A unique three-branch decoder structure is employed to pinpoint lesion sites and determine cancer stages. Experimental outcomes validate the efficacy of our approach in GDT classification, with a precision of 0.993 and a recall of 0.784 in the early cancer category. In pinpointing cancer lesion sites, the weighted F1 score achieved was 0.849. © The author(s) 2024.

关键词： Diseases

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Gait Learning Reproduction for Quadruped Robots Based on Experience Evolution Proximal Policy Optimization

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Journal of Shanghai Jiaotong University (science) 2023年 1-9页

作者： Li, Chunyang Zhu, Xiaoqing Ruan, Xiaogang Liu, Xinyuan Zhang, Siyuan Faculty of Information Technology Beijing University of TechnologyBeijing Key Laboratory of Computational Intelligence and Intelligent SystemEngineering Research Center of Digital Community of Ministry of Education Beijing100124 China

Bionic gait learning of quadruped robots based on reinforcement learning has become a hot research topic. The proximal policy optimization (PPO) algorithm has a low probability of learning a successful gait from scratch due to problems such as reward sparsity. To solve the problem, we propose a experience evolution proximal policy optimization (EEPPO) algorithm which integrates PPO with priori knowledge highlighting by evolutionary strategy. We use the successful trained samples as priori knowledge to guide the learning direction in order to increase the success probability of the learning algorithm. To verify the effectiveness of the proposed EEPPO algorithm, we have conducted simulation experiments of the quadruped robot gait learning task on Pybullet. Experimental results show that the central pattern generator based radial basis function (CPG-RBF) network and the policy network are simultaneously updated to achieve the quadruped robot’s bionic diagonal trot gait learning task using key information such as the robot’s speed, posture and joints information. Experimental comparison results with the traditional soft actor-critic (SAC) algorithm validate the superiority of the proposed EEPPO algorithm, which can learn a more stable diagonal trot gait in flat terrain. © 2023, Shanghai Jiao Tong University.

关键词： Bionics

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Securing STAR-FC-RIS empowered integrated sensing and multiuser communications against target eavesdropping

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science China(information sciences) 2024年第11期67卷 335-346页

作者： Shuying LIN Yulong ZOU Fu XIAO Bin LI School of Telecommunications and Information Engineering Nanjing University of Posts and Telecommunications School of Computer Science Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications

This paper investigates a simultaneous-transmitting-and-reflecting fully-connected reconfigurable intelligent surface(STAR-FC-RIS) empowered integrated sensing and multiuser communications(ISAMC) network, where a dual-functional radar-communication base station detects a malicious radar target nearby and communicates with multiple legitimate users on the other side of the STAR-RIS. We utilize an integrated architecture that combines the fully-connected(FC)-RIS, an emerging type of beyond-diagonal(BD)-RIS, with the time-switching(TS)-STAR-RIS to enhance both the sensing and communications at the cost of possible target intercepting and propose the simultaneous-transmitting-and-reflecting fully-connected RIS(STAR-FCR) schemes to strike a balance between sensing and communications performance. Thereafter, observing the security-reliability performance tradeoff of the downlink ISAMC, we conduct closed-form analyses to compare COPs of round-robin scheduling(RS) and multiuser scheduling(MS) with the aid of a TS-based STAR-FC-RIS. Furthermore, we derive closed-form expressions of the sensing outage probability, communications outage probability(COP), and communications intercept probability, where an average of the three probabilities is exploited to obtain an optimized time allocation(OTA) of the *** results verify that the STAR-FCR-MS scheme outperforms the STAR-FCR-RS scheme in terms of sensing reliability and communications security. Moreover, an OTA remarkably enhances the overall performance of the STAR-FCR schemes of ISAMC systems.

关键词： simultaneous-transmitting-and-reflecting reconfigurable intelligent surface (RIS) fully-connected beyond-diagonal RIS integrated sensing and communications multiuser scheduling security

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Layer-dependent optical and dielectric properties of CdSe semiconductor colloidal quantum wells characterized by spectroscopic ellipsometry

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Journal of Semiconductors 2025年第4期46卷 46-53页

作者： Chenlin Wang Haixiao Zhao Xian Zhao Baoqing Sun Jie Lian Yuan Gao School of Information Science and Engineering Shandong UniversityQingdao 266237China Key Laboratory of Laser&Infrared System(Shandong University) Ministry of EducationShandong UniversityQingdao 266237China Center for Optics Research and Engineering(CORE) Shandong UniversityQingdao 266237China

Semiconductor colloidal quantum wells(CQWs)with atomic-precision layer thickness are rapidly gaining attention for next-generation optoelectronic applications due to their tunable optical and electronic *** this study,we investigate the dielectric and optical characteristics of CdSe CQWs with monolayer numbers ranging from 2 to 7,synthesized via thermal injection and atomic layer(c-ALD)deposition *** a combination of spectroscopic ellipsometry(SE)and first-principles calculations,we demonstrate the significant tunability of the bandgap,refractive index,and extinction coefficient,driven by quantum confinement *** results show a decrease in bandgap from 3.1 to 2.0 eV as the layer thickness ***,by employing a detailed analysis of the absorption spectra,accounting for exciton localization and asymmetric broadening,we precisely capture the relationship between monolayer number and exciton binding *** findings offer crucial insights for optimizing CdSe CQWs in optoelectronic device design by leveraging their layer-dependent properties.

关键词： CdSe CQWs bandgap spectroscopic ellipsometry monolayer number exciton binding energy

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