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Calculating electron-phonon coupling matrix: Theory introduction,code development and preliminary application

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Science China(Technological Sciences) 2023年第1期66卷 204-214页

作者： YE YaoKun WENG MouYi ZHANG WenTao LIN WeiCheng CHEN TaoWen PAN Feng ZHENG JiaXin WANG Lin-Wang School of Advanced Materials Peking UniversityShenzhen Graduate SchoolShenzhen 518055China Instituteof Semiconductors ChineseAcademyof SciencesBeijing100083China

Electron-phonon coupling(EPC) in bulk materials is an important effect in multifarious physical and chemical phenomena. It is the key to explaining the mechanisms for superconductivity, electronic transport, etc. The EPC matrix describes the coupling of the electronic eigenstates of the studied system under the perturbation of phonons. Although the EPC matrix is closely relevant to many fundamental physicochemical properties, it remains a challenge to calculate the EPC matrix precisely due to the high computational cost. In recent years, Giustino et al. developed the EPW method on open-source ab-initio software Quantum Espresso, which uses Wannier functions(WFs) to calculate EPC matrix. However, due to the limitation of their implementation,it is not possible yet to calculate the EPC matrix under some important computational conditions, e.g., for DFT+U and HSE calculation. Given the importance of these computational conditions(e.g., for transition metal oxides), we have developed our own implementation of EPC matrix calculation based on the domestic ab-initio software PWmat. Our code allows the DFT+U and HSE correction, so we can get a more accurate EPC matrix in the related problems. In this article, we will first review the formulae and elucidate how to calculate the EPC matrix by constructing WFs. Then we will introduce our code along with its workflow on PWmat and present our test results of two classical semiconductor systems Al As and Si, showing consistency with EPW. Next, the EPC matrix of Li Co O_(2), a classical cathode material for lithium-ion batteries, is calculated using different exchange correlation(XC) functionals including LDA, PBE, DFT+U and HSE. A comparison is provided for the related EPC matrix. It shows there could be a significant difference for the EPC matrix elements due to the use of different XC *** implementation thus opens the way for fast calculation of EPC for the important class of materials, like the transition metal oxi

关键词： electron-phonon coupling Wannier functions PWmat Quantum Espresso methods

On Hierarchical Compensation Based Active Disturbance Rejection Control for ACMM Problem of Spacecraft

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Journal of systems Science & Complexity 2023年第4期36卷 1480-1497页

作者： LIU Ping CHEN Seng XUE Wenchao LI Wenbo School of Aeronautics and Astronautics Sun Yat-sen UniversityShenzhen 518107China LSC NCMISAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China shenzhen Faroad Intelligent Equipment Co. LtdShenzhen 518105China School of Mathematics and Information Science Shaanxi Normal UniversityXi’an 710062China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China Beijing Institute of Control Engineering China Academy of Space TechnologyBeijing 100086China

The attitude control and momentum management(ACMM)problem is quite fundamental for many spacecrafts including space stations,sky laboratories and *** of single attitude control problem,ACMM problem has to take account of both disturbance rejection and energy *** paper studies the ACMM problem for general spacecraft.A practical active disturbance rejection control architecture is proposed with hierarchical compensation to different kinds of uncertain dynamics or *** particular,by integrating RLS into ESO,the constant and sinusoidal disturbance terms to be compensated are ***,the LQR law is implemented to achieve the desired performance of control systems after disturbance ***,quantitative performances of the generalized ESO,the RLS algorithm and the closed-loop tracking system are rigorously ***,the results under 9-DOF semi-physical test environment show the effectiveness of our control method.

关键词： Active disturbance rejection control attitude control and momentum management extended state observer hierarchical compensation

A LAGRANGIAN RELAXATION-BASED ALGORITHM FOR THE ALLOCATION OF YARD CRANES FOR YARD ACTIVITIES WITH DIFFERENT PRIORITIES

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Journal of systems Science and systems Engineering 2013年第2期22卷 227-252页

作者： Canrong ZHANG Tao WU Li ZHENG Lixin MIAO Logistics Engineering and Simulation Laboratory Graduate School at ShenzhenTsinghua University Department of Industrial Engineering Tsinghua University Business Analytics and Optimization University of PhoenixApollo GroupInc.

This paper proposes a mixed integer programming model for the allocation of rail mounted gantry cranes for four basic yard activities with different priorities. The model pays special attention to the typical features of this kind of gantry cranes, such as a restricted traveling range and a limited number of adjustments during loading and discharging operations. In contrast to most of the literature dealing with these four yard activities individually, this paper models them into an integrated problem, whose computational complexity is proved to be NP-hard. We are therefore motivated to develop a Lagrangian relaxation-based heuristic to solve the problem. We compare the proposed heuristic with the branch-and-bound method that uses commercial software packages. Extensive computational results show that the proposed heuristic achieves competitive solution qualities for solving the tested problems.

关键词： Crane allocation container terminal Lagrangian relaxation sub-gradient yard crane

Efficient detection method for foreign fibers in cotton

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Information Processing in Agriculture 2018年第3期5卷 320-328页

作者： Xuehua Zhao Xiangyun Guo Jie Luo Xu Tan School of Digital Media Shenzhen Institute of Information TechnologyShenzhen 518172China School of Information Management Beijing Information Science&Techonology UniversityBeijing 100192China School of Software Engineering Shenzhen Institute of Information TechnologyShenzhen 518172China

Since foreign fibers in cotton seriously affect the quality of the final cotton textile products,machine-vision-based detection systems for foreign fibers in cotton are receiving extensive attention in industrial *** one of the key components in detection systems,the suitable and good classifier is significantly important for machine-vision-based on detection systems for foreign fibers in cotton due to it improving the system’s *** the study,we test five classifiers in the dataset of foreign fibers in cotton,and for finding the best feature set corresponding to the classifiers,we use the four filter feature selection approaches to find the best feature sets of foreign fibers in cotton corresponding to specific *** experimental results show that the extreme learning machine and kernel support vector machines have the excellent performance for foreign fiber detection and the classification accuracy are respectively 93.61%and 93.17%using the selected corresponding feature set with 42 and 52 features.

关键词： Classification Feature selection Foreign fibers in cotton Detection system

Distribution System Restoration with Cyber Failures Based on Co-dispatching of Multiple Recovery Resources

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Journal of Modern Power systems and Clean Energy 2024年第4期12卷 1096-1112页

作者： Zhengze Wei Kaigui Xie Bo Hu Yu Wang Changzheng Shao Pierluigi Siano Jun Zhong National Key Laboratory of Power Transmission Equipment Technology Chongqing UniversityChongqing 400044China Department of Management and Innovation systems University of SalernoFisciano 84084Italyand he is also with the Department of Electrical and Electronic Engineering ScienceUniversity of JohannesburgJohannesburg 2006South Africa shenzhen Power Supply Co. Ltd.China Southern Power GridShenzhen 518000China

Improving the restoration efficiency of a distribution system is essential to enhance the ability of power systems to deal with extreme *** distribution system restoration(DSR)depends on the interaction among the electric network(EN),cyber network(CN),and traffic network(TN).However,the coordination of these three networks and codispatching of multiple recovery resources have been mostly *** paper proposes a novel DSR framework,which is formulated as a mixed-integer linear programming(MILP)*** failures in cyber lines result in cyber blind areas,which restrict the normal operation of remote-controlled *** accelerate the recovery process,multiple recovery resources are utilized including electric maintenance crews(EMCs),cyber maintenance crews(CMCs),and emergency communication vehicles(ECVs).Specifically,CMCs and ECVs restore the cyber function of switches in cooperation,and EMCs repair damaged electric *** travel time of these three dispatchable resources is determined by *** effectiveness and superiority of the proposed framework are verified on the modified IEEE 33-node and 123-node test systems.

关键词： Distribution system restoration(DSR) network coupling maintenance crew co-dispatching emergency communicationvehicle

Autonomous Vehicles testing Considering Utility-Based Operable Tasks

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Tsinghua Science and Technology 2023年第5期28卷 965-975页

作者： Jingwei Ge Jiawei Zhang Yi Zhang Danya Yao Zuo Zhang Rui Zhou Department of Automation Tsinghua UniversityBeijing 100084China Department of Automation Beijing National Research Center for Information Science and Technology(BNRist)Tsinghua UniversityBeijing 100084Chinaand with Tsinghua-Berkeley Shenzhen Institute(TBSI)Shenzhen 518055Chinaand also with Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic TechnologiesNanjing 210096China Macao University of Science and Technology Macao 999079Chinaand also with Waytous Inc.Shenzhen 518000China

Virtual simulation testing of Autonomous Vehicles(AVs)is gradually being accepted as a mandatory way to test the feasibility of driving strategies for *** methods focus on improving testing efficiency by extracting critical scenarios from naturalistic driving ***,the criticalities defined in their testing tasks are based on fixed assumptions,the obtained scenarios cannot pose a challenge to AVs with different *** fill this gap,we propose an intelligent testing method based on operable testing *** found that the driving behavior of Surrounding Vehicles(SVs)has a critical impact on AV,which can be used to adjust the testing task difficulty to find more challenging *** model different driving behaviors,we utilize behavioral utility functions with binary driving ***,we construct a vehicle interaction model,based on which we theoretically analyze the impact of changing the driving behaviors on the testing task ***,by adjusting SV’s strategies,we can generate more corner cases when testing different AVs in a finite number of simulations.

关键词： Autonomous Vehicle(AV) intelligence testing operable tasks

Recent Progress in High-speed and High Spectral Efficiency Optical Transmission Technology

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China Communications 2010年第3期7卷 24-34页

作者： Zhou Xiang Yu Jianjun AT＆T Labs-Research Middletown NJ 07748 USA ZTE USA inc.NJ USA ZTE inc. shenzhen 518057 Guangdong Province P. R. China

increasing the spectral efficiency and per channel data rate have historically been shown to be the most cost-effective method to meet the need of ever growing capacity demand in the core network. In this paper we review recent progress in high-speed and high-spectral-efficient optical transmission technology. We discuss spectrally efficient modulation and detection technologies that have been experimentally explored for future 100-Gb/s and above optical transmission system. Emerging methods aiming at extending system reach for noise and nonlinearity-stressed high spectral efficiency optical transmission systems have also been reviewed. We show that spectrallyefficient multilevel coding coupled with polarization multiplexing and digital coherent detection has the potential to enable 400Gb/s per channel WDM system operating with existing 50GHzspaced WDM infrastructure at a spectral efficiency of 8b/s/Hz.

关键词： optical modulation format coherent detection fiber and DSP

Exploring Image Generation for UAV Change Detection

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IEEE/CAA Journal of Automatica Sinica 2022年第6期9卷 1061-1072页

作者： Xuan Li Haibin Duan Yonglin Tian Fei-Yue Wang Peng Cheng Laboratory Shenzhen 518000China IEEE State Key Laboratory of Virtual Reality Technology and systems School of Automation Science and Electrical EngineeringBeihang UniversityBeijing 100083 Department of Automation University of Science and Technology of ChinaHefei 230027 State Key Laboratory for Management and Control of Complex systems Institute of AutomationChinese Academy of SciencesBeijing 100190China Research Center for Computational Experiments and Parallel systems Technology National University of Defense TechnologyChangsha 410073China

Change detection(CD)is becoming indispensable for unmanned aerial vehicles(UAVs),especially in the domain of water landing,rescue and ***,even the most advanced models require large amounts of data for model training and ***,sufficient labeled images with different imaging conditions are *** by computer graphics,we present a cloning method to simulate inland-water scene and collect an auto-labeled simulated *** simulated dataset consists of six challenges to test the effects of dynamic background,weather,and noise on change detection ***,we propose an image translation framework that translates simulated images to synthetic *** framework uses shared parameters(encoder and generator)and 22×22 receptive fields(discriminator)to generate realistic synthetic images as model training *** experimental results indicate that:1)different imaging challenges affect the performance of change detection models;2)compared with simulated images,synthetic images can effectively improve the accuracy of supervised models.

关键词： Change detection computer graphics image translation simulated images synthetic images unmanned aerial vehicles(UAVs)

The role of distinct co-mutation patterns with TP53 mutation in immunotherapy for NSCLC

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Genes & Diseases 2022年第1期9卷 245-251页

作者： Shuhang Wang Miaomiao Jiang Zuozhen Yang Xiaoyun Huang Ning Li Clinical Cancer Center National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021PR China Research and Development ZhiyuIncShenzhenGuangdong 518000PR China Zhiyu Center for systems Biology ShenzhenGuangdong 518000PR China MOE Laboratory of Biosystem Homeostasis and Protection College of Life SciencesZhejiang UniversityHangzhouZhejiang 310058PR China

TP53 mutations was reported to be correlated to the efficacy of program death-1(PD-1)and program death ligand-1(PD-L1).The role of co-mutations of TP53 with other recurrently mutated genes in outcome of anti-PD-(L)1 treatment for non-small cell lung cancer(NSCLC)is *** we mined a previously generated dataset to address the effect of co-mutations on the progression free survival(PFS)of NSCLC ***-synonymous mutations and clinical data of 240 NSCLC patients with anti-PD-(L)1 based therapy was downloaded from *** 206 patients received monotherapy and 34 patients received combination *** 240 NSCLC patients,TP53 mutation rate was 59.2%.For the monotherapy cohort,TP53 mutated NSCLC patients have a significantly longer PFS(4.3 vs.2.5 months,P=0.0019)compared with TP53 wild type NSCLC *** same tendency was also observed in the combination therapy cohort,but the difference in PFS(6.3 vs.5.4 months,P=0.12)was not ***-smoker had a longer PFS compared to never-smokers(4.0 vs.2.7 months).For further co-mutation analysis with TP53 including KEAP1 mutation(53/240,22.1%),KMT3C mutation(26/240,10.8%),STK11 mutation(56/240,23.3%),EGFR mutation(28/240,11.7%)and KRAS mutation(86/240,35.8%).Patients with both TP53 plus KEAP1 mutations in all 240 patients had a longer PFS compared with co-wild population(PFS 9.2 vs.4.2 months,P=0.012)when treated with PD-1/PD-L1 ***53 might be the dominating mutation correlating with longer PFS in PD-1/PD-L1 *** genes displayed distinct effect when co-mutated with TP53 in NSCLC patients.

关键词： NSCLCPD-1 PD-L1 PFS TP53 co-mutation