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Energy-Efficient UAV Trajectory Design for Backscatter Communication: A Deep Reinforcement Learning Approach

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China Communications 2020年第10期17卷 129-141页

作者： Yiwen Nie Junhui Zhao Jun Liu jing jiang Ruijin Ding School of Electronic and Information Engineering Beijing Jioatong UniversityBeijing 100044China School of Information Engineering East China Jiaotong UniversityNanchang 330013China Institute of Network Sciences and Cyberspace Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology(BNRist) Beijing 100084China Shaanxi Key Laboratory of Information Communication Network and Security Xi’an University of Posts and TelecommunicationsXi’an 710121China Institute for Artificial Intelligence Tsinghua University(THUAI)Beijing 100084China State Key Laboratory of Intelligent Technologies and Systems Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology(BNRist) Department of AutomationTsinghua UniversityBeijing 100084China

Recently,backscatter communication(BC)has been introduced as a green paradigm for Internet of Things(IoT).Meanwhile,unmanned aerial vehicles(UAVs)can serve as aerial base stations(BSs)to enhance the performance of BC system thanks to their high mobility and *** this paper,we investigate the problem of energy efficiency(EE)for an energy-limited backscatter communication(BC)network,where backscatter devices(BDs)on the ground harvest energy from the wireless signal of a flying rotary-wing ***,we first reformulate the EE optimization problem as a Markov decision process(MDP)and then propose a deep reinforcement learning(DRL)algorithm to design the UAV trajectory with the constraints of the BD scheduling,the power reflection coefficients,the transmission power,and the fairness among *** results show the proposed DRL algorithm achieves close-to-optimal performance and significant EE gains compared to the benchmark schemes.

关键词： unmanned aerial vehicle(UAV) trajectory design backscatter communication deep reinforcement learning energy-efficient

Differential Game Model of Resource Extraction with Continuous and Dynamic Updating

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Journal of the Operations Research Society of China 2024年第1期12卷 51-75页

作者： Ovanes Petrosian Tihomirov Denis jiang-jing Zhou Hong-Wei Gao School of Mathematics Harbin Institute of TechnologyHarbin150001HeilongjiangChina School of Automation Qingdao UniversityQingdao266071ShandongChina Faculty of Applied Mathematics and Control Processes Saint-Petersburg State UniversitySaint PetersburgRussia National Research University"High School of Economics" Saint-PetersburgRussia School of Mathematics and Statistics Qingdao UniversityQingdao266071ShandongChina

This paper is devoted to a new class of differential games with continuous and dynamic *** direct application of resource extraction in a case of dynamic and continuous updating is *** is proved that the optimal control(cooperative strategies)and feedback Nash equilibrium strategies uniformly converge to the corresponding strategies in the game model with continuous updating as the number of updating instants converges to *** results are presented for an optimal trajectory(cooperative trajectory),equilibrium trajectory and corresponding payoffs.

关键词： Differential games Dynamic updating Continuous updating Optimal control Feedback Nash equilibrium

Untangling the influence of soil moisture on root pullout property of alfafa plant

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Journal of Arid Land 2020年第4期12卷 666-675页

作者： ZHANG Chaobo LIU Yating LIU Pengchong jiang jing YANG Qihong College of Water Resources Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Changjiang River Scientific Research Institute Changjiang Water Resources CommissionWuhan 430010China

Root pullout property of plants was of key importance to the soil reinforcement and the improvement of slope stability. To investigate the influence of soil moisture on root pullout resistance and failure modes in soil reinforcement process, we conducted pullout tests on alfalfa(Medicago sativa L.) roots at five levels(40, 30, 20, 10 and 6 kPa) of soil matric suction, corresponding to respectively 7.84%, 9.66%, 13.02%, 19.35% and 27.06% gravimetric soil moisture contents. Results showed that the maximal root pullout force of M. sativa decreased in a power function with increasing soil moisture content from 7.84% to 27.06%. Root slippage rate increased and breakage rate decreased with increasing soil moisture content. At 9.66% soil moisture content, root slippage rate and breakage rate was 56.41% and 43.58%, respectively. The threshold value of soil moisture content was about 9.00% for alfalfa roots in the loess soil. The maximal pullout force of M. sativa increased with root diameter in a power function. The threshold value of root diameter was 1.15 mm, because root slipping force was greater than root breaking force when diameter >1.15 mm, while diameter ≤1.15 mm, root slipping force tended to be less than root breaking force. No significant difference in pullout forces was observed between slipping roots and breaking roots when they had similar diameters. More easily obtained root tensile force(strength) is suggested to be used in root reinforcement models under the condition that the effect of root diameter is excluded as the pullout force of breaking roots measured in pullout tests is similar to the root tensile force obtained by tensile tests.

关键词： shallow landslides root reinforcement soil moisture content threshold of root diameter root pullout force soil conservation

Dynamic Response Analysis and Vibration Control for A Fixed-Bottom Offshore Wind Turbine Subjected to Multiple External Excitations

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China Ocean Engineering 2022年第1期36卷 50-64页

作者： XIE Shuang-yi ZHANG Cheng-lin HE Jiao jiang jing GAO Jian College of Mechanical Engineering Chongqing University of TechnologyChongqing 400054China Fishery Machinery and Instrument Research Institute Chinese Academy of Fishery SciencesShanghai 200092China College of Engineering Science and Technology Shanghai Ocean UniversityShanghai 201306China School of Mechanical and Power Engineering Chongqing University of Science&TechnologyChongqing 401331China Chongqing Vocational College of Public Transportation Chongqing 402247China Beijing Institute of Precision Mechatronics and Controls Beijing 100076China

For the offshore wind turbines installed in earthquake areas,their operation is affected by seismic loads in addition to wind and wave ***,it is necessary to study the dynamic responses and vibration control of the wind *** previous studies,the structural responses of offshore wind turbines are usually investigated in the parked case,while the blade rotation effect is usually not *** evaluation on the structural responses may be inaccurate under this condition,further affecting the evaluation on the vibration control performance of a control *** view of it,this paper established a complete multi-body model of a fixed-bottom offshore wind turbine considering pile-soil interaction,and then performed simulations when the wind turbine was subjected to multiple external ***,a single tuned mass damper(STMD)system and a multiple tuned mass dampers(MTMDs)system were applied to control structural vibrations of the wind ***,based on the construction of a simplified main structure-TMD system,TMD parameters were ***,twelve load cases including operating and parked conditions were selected to perform *** show that the influence of the seismic excitation on blade responses is greater under the parked condition than that under the operating ***,STMD/MTMDS exhibit better performance under the parked condition than that under the operating *** with STMD,MTMDS can better suppress the vibrations at both the fundamental and high-order modes,and exhibits significant robustness under the condition of changing soil parameters.

关键词： multi-body dynamics vibration control STMD/MTMDS earthquake loading SIMPACK

Clinical Biobanks, from the World to China

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Biomedical and Environmental Sciences 2014年第6期27卷 481-483页

作者： JI Xu ZHAO Xiu Mei jiang jing jing YIN Ling GUO Yu Cheng Clinical Specimen Bank Translational Medical Center Chinese PLA General Hospital Administrative Office of Chinese PLA General Hospital

The 2009 annual special issue of Time Magazine on March 23rd summarized the ＇10 Ideas Changing the World Right Now＇, in which ＇Biobank＇ had been listed as the eighth. Biobank or biorepository has been developed since last century. Tissue banks represented the early type of clinical biobanks and mainly concentrated on clinical usage such as transplantation at the beginning. The first tissue bank in the United States started in 1949 is the United States Navy Tissue Bank. In 1976, the foundation of American Association of Tissue Banks （AATB） claimed the official show of biobanks on social stage （***）. From the end of 20th Century to the beginning of 21st Century, diverse biobanks of clinical samples, seed banks, gene banks, germplasm banks of non-human species and other various types have sprung up.

关键词： from the World to China World Clinical Biobanks

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World Journal of Gastroenterology 2024年第44期30卷 4689-4696页

作者： Dong-Ming Li Xue-Yuan Cao jing jiang Department of Gastric and Colorectal Surgery General Surgery CenterThe First Hospital of Jilin UniversityChangchun 130021Jilin ProvinceChina Department of Clinical Epidemiology The First Hospital of Jilin UniversityChangchun 130021Jilin ProvinceChina

Pancreatic cancer(PC),a highly lethal tumor with nearly identical incidence and mortality rates,has become the sixth leading cause of cancer-related *** is an important malignant factor in PC,as it regulates angiogenesis,metabolic reprogramming,tumor progression,and *** the hypoxic microenvironment can enhance the efficacy of antitumor therapy and improve the prognosis of patients with *** the advent of bioinformatics,hypoxia-related PC models have emerged in recent *** provide a reference for estimating the prognosis and immune microenvironment of patients with PC and identify potential biomarkers for targeting hypoxic ***,these findings based on bioinformatic analysis may not be completely reliable without further experimental evidence and clinical cohort *** application of these models and biomarkers in clinical practice to predict survival time and develop anti hypoxic therapeutic strategies for patients with PC remains in its *** this editorial,we review the current status of hypoxia-related prognostic models in PC,analyze their similarities and differences,discuss several existing challenges,and provide potential solutions and directions for further *** editorial will facilitate the optimization,validation,and determination of the molecular mechanisms of related models.

关键词： Pancreatic cancer Hypoxia Bioinformatics analysis Prognosis Tumor microenvironment

The functions of N6-methyladenosine modification in lncRNAs

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Genes & Diseases 2020年第4期7卷 598-605页

作者： Rong-Zhang He jing jiang Di-Xian Luo Department of Clinical Pharmacology Xiangya HospitalCentral South UniversityChangsha410078HunanChina Translational Medicine Institute National&Local Joint Engineering Laboratory for High-through Molecular Diagnosis TechnologyCollaborative Research Center for Post-doctoral Mobile Stations of Central South UniversityAffiliated the First People’s Hospital of ChenzhouUniversity of South ChinaChenzhou423000China Center for Clinical Pathology The First People’s Hospital of ChenzhouUniversity of South ChinaChenzhou423000People’s Republic of China

Increasing evidence indicates that mRNAs are often subject to posttranscriptional *** them,N6-methyladenosine(m6A),which has been shown to play key roles in RNA splicing,stability,nuclear export,and translation,is the most abundant modification of *** studies of m6A modification of mRNAs have been carried out,while little is known about m6A modification of long non-coding RNAs(lncRNAs).Recently,several studies reported m6A modification of *** this review,we focus on these m6A-modified lncRNAs and discuss possible functions of m6A modification.

关键词： Erasers LncRNA N6-methyladenosine Readers Writers

Analysis of three types of triterpenoids in tetraploid white birches(Betula platyphylla Suk.) and selection of plus trees

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Journal of Forestry Research 2015年第3期26卷 623-633页

作者： Sui Wang Hui Zhao jing jiang Guifeng Liu Chuanping Yang State Key Laboratory of Tree Genetics and Breeding Northeast Forestry University

Betulin, oleanolic acid, and betulinic acid are naturally occurring pentacyclic triterpenoids that have significant medicinal value. Considerable amounts of these triterpenoids are available in the outer bark of white birch. In this study, we used ultrasound-assisted extraction （UAE） to extract triterpenoids from birch bark rapidly and with high efficiency. Using high performance liquid chro- matography （HPLC）, three types of triterpenoids were separated and detected. We examined the differences among triterpenoids extracted from diploid versus tetra- ploid white birch. Then, we used factor analysis to screen out tetraploid white birches with comprehensively excel- lent performance. The results indicate that the optimum conditions for extraction include the use of ethanol as an extraction solvent, a solid-to-liquid ratio of 0.1 g/10 ml, ultrasonic power set at 100 W, a temperature of 60 ℃ and an extraction time of 15 min. A reversed-phase C18 col- umn （4.6 mm × 250 mm × 5 μm） with a column tem- perature of 30 ℃ and the mobile phase composed of A （acetonitrile） and B （0.1% aqueous phosphoric acid, v/v） at a flow rate of 0.5 ml/min were used, and the detection wavelength was 195 nm. No significant difference wasobserved between diploid and tetraploid white birch in terms of the content of three types of triterpenoids （at a confidence level of 0.05）. As triterpenoid content, height, and DBH （diameter at breast height） are strongly interre- lated, we used factor analysis to evaluate all individuals, and we screened out six plus trees with excellent com- prehensive characters.

关键词： Betula platyphylla Suk Triterpenoids Highperformance liquid chromatography (HPLC) Tetraploid Diploid Factor analysis

Progeny test of tetraploid Betula platyphylla and preliminary selection of hybrid parents

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Journal of Forestry Research 2016年第3期27卷 665-674页

作者： Huanwen Xu Yu Liu jing jiang Guifeng Liu Xiyang Zhao State Key Laboratory of Tree Genetics and Breeding Northeast Forestry University

Estimating genetic parameters of parental lines through progeny testing and choosing good hybrid parents are important for genetically improving seed orchard *** this study, 24 tetraploid progeny seedlings were used as experimental materials, which came from test cross design：six tetraploid Betula platyphylla lines（Q33, Q13, Q103,Q19, Q83 and Q14） as female parents and four individual B. platyphylla diploid lines（F3, F4, F9 and F11） as male parents were crossed. Variance analysis of height, diameter, height-to-diameter ratio, and internodal distance showed that the differences between hybrid combinations reached highly significant levels. Using multi-objective decisionmaking, we performed a comprehensive assessment of the various hybrid combinations. Using a selection rate of 20 % of the standard, five hybrids were selected;their genetic gains in average height, diameter, height-todiameter ratio, and internodal distance were 20.95, 6.07,13.07 and 8.96 %, respectively. We also analyzed the combining ability and genetic parameter effect values of parents and hybrid combinations. The combined analysis revealed that Q13, Q103, Q33 and Q83 were superior females; F3, F4, and F9 were superior males; and F3 × Q13, F4 × Q83 and F9 × Q33 were superior hybrid combinations. The heights and diameters of these progenies were 22.49 and 11.48 % greater than average,respectively.

关键词： Betula platyphylla Combining ability Testcross