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Cloud-Base Distribution and Cirrus Properties Based on Micropulse Lidar Measurements at a Site in Southeastern China

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Advances in Atmospheric Sciences 2015年第7期32卷 991-1004页

作者： Jianjun LIU Zhanqing LI ZHENG Youfei Maureen CRIBB State Laboratory of Earth Surface Process and Resource Ecology and College of Global Change and Earth System Science Beijing Normal University Earth System Science Interdisciplinary Center University of Maryland Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing University of Information Science and Technology

The cloud fraction （CF） and cloud-base heights （CBHs）, and cirrus properties, over a site in southeastern China from June 2008 to May 2009, are examined by a ground-based lidar. Results show that clouds occupied the sky 41% of the time. Significant seasonal variations in CF were found with a maximum/minimum during winter/summer and similar magnitudes of CF in spring and autumn. A distinct diurnal cycle in the overall mean CF was seen. Total, daytime, and nighttime annual mean CBHs were 3.05 ± 2.73 km, 2.46 ± 2.08 kin, and 3.51 ± 3.07 km, respectively. The lowest/highest CBH occurred around noon/midnight. Cirrus clouds were present ～36.2% of the time at night with the percentage increased in summer and decreased in spring. Annual mean values for cirrus geometrical properties were 8.89 ± 1.65 km, 9.80 ± 1.70 kin, 10.73 ± 1.86 km and 1.83± 0.91 km for the base, mid-cloud, top height, and the thickness, respectively. Seasonal variations in cirrus geometrical properties show a maximum/minimum in summer/winter for all cirrus geometrical parameters. The mean cirrus lidar ratio for all cirrus cases in our study was ～ 25 ± 17 sr, with a smooth seasonal trend. The cirrus optical depth ranged from 0.001 to 2.475, with a mean of 0.34 ± 0.33. Sub-visual, thin, and dense cirrus were observed in ～12%, 43%, and 45% of the cases, respectively. More frequent, thicker cirrus clouds occurred in summer than in any other season. The properties of cirrus cloud over the site are compared with other lidar-based retrievals of midlatitude cirrus cloud properties.

关键词： cloud-base distribution cirrus propertfes lidar southeastern China

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Aerosol optical properties over three cities of Angola using long term AERONET data

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Atmospheric Pollution Research 2025年第8期16卷

作者： Campos, Pascoal Micolo D. Moses, Angella G. Li, Ke Tchanche, Bertrand Leitão, Anabela A. Pires, José C.M. CNIC – Centro Nacional de Investigação Científica Ministério do Ensino Superior Ciência Tecnologia e Inovação Avenida Ho Chi Minh Nº 201 Luanda Angola UNMA – Uganda National Meteorological Authority Kampala Uganda Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Centre of Atmospheric Environment and Equipment Technology Joint International Research Laboratory of Climate and Environment Change School of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing China Department of Physics Alioune Diop University Bambey Senegal LESRA – Laboratório de Engenharia da Separação Reacção e Ambiente Universidade Agostinho Neto Avenida Ho Chi Minh Nº 201 Luanda Angola LEPABE – Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto Rua Dr. Roberto Frias Porto 4200-465 Portugal

Aerosols can influence the climate, by scattering or absorbing solar radiation. The presence of aerosols may also affect human health as their exposure has been linked to pulmonary and cardiovascular diseases. This paper aims to investigate the spatiotemporal trends of aerosol optical properties, the major types of aerosols, the possible sources of the aerosols, and the aerosol radiative forcing at three locations in Angola, namely, Huambo, Lubango, and Namibe, using the Aerosol Robotic Network (AERONET) dataset from 2016 to 2021. The results revealed that at the three sites, there was a decrease in the aerosol optical depth (AOD) during the warm months, a period characterized by rainfall, and the minimum loadings of AOD varied between 0.073 and 0.132. Huambo registered the highest percentages of biomass-burning aerosols (79 %), followed by Lubango (56 %) and Namibe (21 %). The Ångström exponent (AE) at Lubango ranged from 1.48 to 1.52, denoting the existence of fine-mode aerosol particles. The annual mean of the volume size distribution (VSD) showed that among the three sites, Huambo registered the highest concentration of fine-mode aerosols particles (0.053 μm³/μm²) when compared with Namibe (0.034 μm³/μm²) and Lubango (0.030 μm³/μm²). The mean peak radius of the fine particle over the three sites was about 0.15 μm, while the mean peak radius of the coarse particle registered at both Huambo and Lubango (5.06 μm) was greater than the one at Namibe (3.86 μm). Namibe had the highest annual mean of VSD for coarse-mode aerosol particles among all sites. Further, an investigation revealed that the annual mean aerosol radiative forcing (ARF) at the bottom of the atmosphere (BOA) was the highest at Huambo (−53.63 Wm^-2), while the ARFs at the top of the atmosphere (TOA) varied between −13.91 Wm^-2 and -9.59 Wm^-2, among the three sites. The annual mean ARF efficiencies (ARFE) s

关键词： Aerosol types Radiative forcing Single scattering albedo Volume size distribution Ångström exponent

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Verifiable Fully Homomorphic Encryption scheme

Verifiable Fully Homomorphic Encryption scheme

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2012 2nd International Conference on Consumer Electronics, Communications and Networks, CECNet 2012

作者： Jin, Fangyuan Zhu, Yanqin Luo, Xizhao Department of Computer Science and Technology Soochow University Suzhou China Jiangsu Provincial Key Laboratory for Computer Information Processing Technology Soochow University Suzhou China

We construct a general Verifiable Fully Homomorphic Encryption, using the existed Fully Homomorphic Encryption schemes. The main appeal of the scheme is the verifiability of Evaluate function. Its security and other p... 详细信息

ISBN: (纸本)9781457714153

关键词： Cryptography

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Building a Stereo and Wide-View Hybrid RGB/FIR Imaging System for Autonomous Vehicle

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IEEE Sensors Journal 2022年第2期22卷 1638-1651页

作者： Zhang, Yigong Sun, Zezhou Wu, Banghe Yang, Jian Kong, Hui Key Laboratory of Intelligent Perception and Systems for High-Dimensional Information Ministry of Education Jiangsu Key Laboratory of Image and Video Understanding for Social Security School of Computer Science and Engineering Nanjing University of Science and Technology Nanjing China University of Macau Taipa China

In this work, a novel paradigm is proposed to build a hybrid RGB/FIR camera, which outputs pixel-wisely aligned and temporally synchronized RGB and FIR frames simultaneously. Compared with the existing schemes, we innovate in several ways to make it compact, practical, and extendable for real-world applications. First, we propose a new structure layout design of the hybrid camera, and we also design a removable adjuster to detach the hybrid camera from the base platform. For RGB and FIR image registration, we have achieved a pixel-wise spatial registration of the FIR and RGB frames by a two-step alignment, where we propose a ghost-effect removal scheme to remove the ghost effect from the rolling-shutter-based FIR camera. Finally, multiple hybrid cameras are extended to a hybrid camera array, through which we can obtain wide-view spatially aligned FIR, RGB and disparity images simultaneously. The experimental results demonstrate the accuracy of the hybrid camera and the effectiveness of the designed stereo wide-view hybrid camera system. © 2001-2012 IEEE.

关键词： Cameras

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A Trusted Multi-Task Distribution Mechanism for Internet of Vehicles Based on Smart Contract

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China Communications 2023年第4期20卷 212-226页

作者： Xujie Li Yuan Xu Jing Tang Ying Sun Shaoshuai Fan Fei Shen College of Computer and Information Hohai UniversityNanjing 210098China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China School of Information Engineering Jiangsu Open UniversityNanjing 210017China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China

In this paper,a trusted multi-task distribution mechanism for Internet of Vehicles based on smart contract is proposed to improve the security and efficiency for the task distribution in Internet of ***,a three-tier trusted multi-task distribution framework is presented based on smart *** smart contract will be triggered by the task *** the important part of the smart contract,the task distribution algorithm is stored on the blockchain and run *** the process of the task distribution,the cost of the task distribution and the system stability play a critical ***,the task distribution problem is formulated to minimize the cost of the task distribution whilst maintaining the stability of the system based on Lyapunov ***,this problem is a mixed integer nonlinear programming problem with NP-hard *** tackle this,the optimization problem is decomposed into two sub problems of computing resource allocation and task distribution decision,and an effective task distribution algorithm is *** results show that the proposed algorithm can effectively improves system performance.

关键词： task distribution resource allocation Lyapunov optimization smart contract

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Discrimination-Aware Domain Adversarial Neural Network

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Journal of computer Science & technology 2020年第2期35卷 259-267页

作者： Yun-Yun Wang Jian-Min Gu Chao Wang Song-Can Chen Hui Xue College of Computer Science and Engineering Nanjing University of Posts and Telecommunications Nanjing 210046China Jiangsu Key Laboratory of Big Data Security and Intelligent Processing Nanjing 210046China College of Computer Science and Technology/College of Artificial Intelligence Nanjing University of Aeronautics and AstronauticsNanjing 210023China Key Laboratory of Pattern Analysis and Machine Intelligence Ministry of Industry and Information Technology Nanjing 210023China School of Computer Science and Engineering Southeast UniversityNanjing 210096China

The domain adversarial neural network(DANN)methods have been successfully proposed and attracted much attention *** DANNs,a discriminator is trained to discriminate the domain labels of features generated by a generator,whereas the generator attempts to confuse it such that the distributions between domains are *** a result,it actually encourages the whole alignment or transfer between domains,while the inter-class discriminative information across domains is not *** this paper,we present a Discrimination-Aware Domain Adversarial Neural Network(DA2NN)method to introduce the discriminative information or the discrepancy of inter-class instances across domains into deep domain ***2NN considers both the alignment within the same class and the separation among different classes across domains in knowledge transfer via multiple *** results show that DA2NN can achieve better classification performance compared with the DANN methods.

关键词： adversarial learning inter-class separation deep neural network discrimination-aware domain adaptation

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Research on evaluation index system for software vulnerability analysis methods 4

Research on evaluation index system for software vulnerabili...

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4th IEEE International Conference on Data Science in Cyberspace, DSC 2019

作者： Li, Jin Huang, Min-Huan Lu, Shuai-Bing Li, Hu Chen, Jin-Fu National Key Laboratory of Science and Technology on Information System Security Beijing China School of Computer Science and Communication Engineering Jiangsu University Jiangsu China

ISBN: (纸本)9781728145280

Due to the diversity of existing software vulnerability analysis methods, a unified index system is required if we are to accurately and comprehensively evaluate the analytic effects in order to further improve the level of analysis. Accordingly, this paper first proposes the principles and process necessary to construct an evaluation index system for software vulnerability analysis. Moreover, by focusing on the problems identified in previous relevant research, an evaluation index system for software vulnerability analysis methods that contains four aspects-accuracy, coverage, value and performance-is proposed;this system is more comprehensive and complete than existing achievements. Finally, using the vulnerability analysis testing framework, the indexes of the three different versions of cppcheck are measured. The results show that the proposed evaluation index system can be used for the comparative evaluation of different vulnerability analysis methods. © 2019 IEEE.

关键词： Analysis method Evaluation index system Software vulnerability

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Multi-target localization using distributed MIMO radar based on spatial sparsity

Multi-target localization using distributed MIMO radar based...

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2021 IEEE International Conference on Artificial Intelligence and computer Applications, ICAICA 2021

作者： Zhao, Chenyang Ke, Wei Wang, Tingting Nanjing Normal University Jiangsu Key Laboratory on Optoelectronic Technology in School of Computer and Electronic Information School of Artificial Intelligence Nanjing China Nanjing University of Information Science Technology Jiangsu Key Lab of Meteorological Observation and Information Processing Nanjing China

ISBN: (纸本)9781665418676

This paper presents a sparsity-based multi-target localization method for multiple-input multiple-output (MIMO) radar systems using distributed antennas. Since targets usually lie at some points within the localization domain, we are able to exploit this sparsity to convert the radar localization problem into a distributed recovery solution. Based on this natural sparsity, in this paper we introduce a block-sparse illustration model for distributed MIMO radar and propose a completely unique block-sparse recovery algorithmic rule supported approximate l0 norm diminution. The novelty of this technique is using l0 norm to push inter-block sparsity within the signals and also the optimisation problem is resolved by an ordered procedure in conjunction with a conjugate-gradient technique for quick reconstruction. Moreover, the amount of targets doesn't be well-known in advance. The effectiveness of this technique is incontestable by simulation results that obtain better localization performance and reduce computation complexness for giant sized data. © 2021 IEEE.

关键词： MIMO radar

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Adaptive sliding mode controller for vehicle suspension system

Adaptive sliding mode controller for vehicle suspension syst...

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2011 International Conference on information Science and technology, ICIST 2011

作者： Xin, Mingyuan Fei, Juntao Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology College of Computer and Information Hohai University Changzhou 213022 China

ISBN: (纸本)9781424494408

For the tracking control problem of vehicle suspension system, a method of adaptive sliding mode control is derive in this paper. The influence of parameter uncertainties and external disturbances on the system performance can be reduced and control robustness can be improved. The adaptive sliding mode controller is designed so that the practical system can track the state of the reference model. The asymptotically stability of the adaptive sliding mode control system is proved based on the Lyapunov stability theory. Numerical simulations demonstrate the effectiveness of the proposed adaptive sliding mode control. © 2011 IEEE.

关键词： Sliding mode control

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System dynamics and adaptive control of MEMS gyroscope sensor

System dynamics and adaptive control of MEMS gyroscope senso...

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作者： Fei, Juntao Dai, Weili Hua, Mingang Xue, Yuncan Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology College of Computer and Information Hohai University Changzhou 213022 China

ISBN: (纸本)9783902661937

This paper presents an adaptive control approach for Micro-Electro- Mechanical Systems (MEMS) z-axis gyroscope sensor. The dynamical model of MEMS gyroscope sensor is developed and established. The proposed adaptive control approaches can estimate the angular velocity and the damping and stiffness coefficients including the coupling terms due to the fabrication imperfection. The stability of the closed-loop systems are established with the proposed adaptive control strategies. Numerical simulations are investigated to verify the effectiveness of the proposed control schemes. © 2011 IFAC.

关键词： Sliding mode control

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