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Fuzzy sliding Mode Active Disturbance Rejection Control of an Autonomous Underwater Vehicle-Manipulator system

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Journal of Ocean University of China 2020年第5期19卷 1081-1093页

作者： ANG Hongdu LI Xiaogang LIU Xin KARKOUB Mansour zhou Liqin College of Engineering Ocean University of ChinaShandong Engineering Research Center of Marine Intelligent Equipment and InstrumentsQingdao 266100China Department of Investigation Sichuan Police CollegeLuzhou 646000China Mechanical Engineering Texas A&M University at QatarDoha 23874Qatar

In this paper, a fuzzy sliding mode active disturbance rejection control(FsMADRC) scheme is proposed for an autonomous underwater vehicle-manipulator system(AUVMs) with a two-link and three-joint manipulator. First, the AUVMs is separated into nine subsystems, and the combined effects of dynamic uncertainties, hydrodynamic force, unknown disturbances, and nonlinear coupling terms on each subsystem are lumped into a single total disturbance. Next, a linear extended state observer(LEsO) is presented to estimate the total disturbance. Then, a sliding mode active disturbance rejection control(sMADRC) scheme is proposed to enhance the robustness of the control system. The stability of the sMADRC and the estimation errors of the LEsO are analyzed. Because it is difficult to simultaneously adjust several parameters for a LEsO-based sMADRC scheme, a fuzzy logic control(FLC) scheme is used to formulate the FsMADRC to determine the appropriate parameters adaptively for practical applications. Finally, two AUVMs tasks are illustrated to test the trajectory tracking performance of the closed-loop system and its ability to reject and attenuate the total disturbance. The simulation results show that the proposed FsMADRC scheme achieves better performance and consume less energy than conventional PID and FLC techniques.

关键词： Fuzzy sliding mode active disturbance rejection controller(FsMADRC) linear extended state observer(LEsO) auto-nomous underwater vehicle-manipulator system(AUVMs) total disturbance fuzzy logic control

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

strongly nonlinear topological phases of cascaded topoelectrical circuits

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Frontiers of physics 2023年第3期18卷 51-58页

作者： Jijie Tang Fangyuan Ma Feng Li Honglian Guo Di zhou College of science Minzu University of ChinaBeijing 100081China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China

Circuits provide ideal platforms of topological phases and matter,yet the study of topological circuits in the strongly nonlinear regime,has been *** propose and experimentally demonstrate strongly nonlinear topological phases and transitions in one-dimensional electrical circuits composed of nonlinear *** topological interface modes arise on domain walls of the circuit lattices,whose topological phases are controlled by the amplitudes of nonlinear voltage *** measured topological transition amplitudes are in good agreement with those derived from nonlinear topological band *** prototype paves the way towards flexible metamaterials with amplitude-controlled rich topological phases and is readily extendable to two and three-dimensional systems that allow novel applications.

关键词： strongly nonlinear Berry phase topological electrical

Tropical deciduous forest in yunnan,southwestern China:Implications for geological and climatic histories from a little-known forest formation

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Plant Diversity 2021年第6期43卷 444-451页

作者： Hua Zhu Peter Ashton Bojian Gu shisun zhou yunhong Tan Center for Integrative Conservation Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglaYunnan 666303PR China Arnold Arboretum Harvard University and Royal Botanic GardensKewUK

In the southern mountain ranges of yunnan province,China,deep valleys of several large rivers create rain shadows with hot dry summers,and are locally designated tropical;towards the north,notably in the Lancang(Upper Mekong)valley,these regions may experience frost during *** woody forest canopy of these valleys is predominantly deciduous,with evergreen elements in the north,where the canopy is open and the forest ***,we here present tall forest with a closed deciduous canopy and semi-evergreen subcanopy observed in hot dry valleys of these rivers and their tributaries in the tropical *** structure and physiognomy of these forests resemble the tall(moist)deciduous forest formation widespread in south Asia and ***,these forests are largely composed of tropical elements at both the generic(80%)and the species level(>70%),indicating that these forests are indeed *** originally hypothesized that these isolated forests represent refugia of a pre-Holocene extension of tall(moist)deciduous forest formation of south Asia and *** sample plot we established to test this hypothesis confirmed that these forests share the structure and physiognomy of the tall(moist)deciduous forest formation;however,the plots also showed that these forests lack the characteristic and dominant species of the formation's Indo-Burmese *** tree flora,in particular,indicates that both deciduous and evergreen elements are instead mostly derived from the adjacent tropical semi-evergreen forests of tropical southern China;yet they also include an important endemic element,which implies that these forests have survived as refuges possibly since the *** exceptional representation of evergreen elements in these forests indicates that they have rarely been subject to hot fires or domestic cattle browsing,adding to the unique nature of the forests and further justifying their strict conservation.

关键词： Floristic composition Physiognomy Biogeography Independent species assembly Tall deciduous forest southwestern China

Paracentral Acute Middle Maculopathy Treated with Acupuncture:A Case Report

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Chinese Journal of Integrative Medicine 2020年第9期26卷 709-712页

作者： WU Jian-guo HUANG Zi-yang zhou Wan-yu Department of Ophthalmology Xiyuan HospitalChina Academy of Chinese Medical SciencesBeijing(100091)China

Paracentral acute middle maculopathy(PAMM)was first named by sarraf,et al in 2013,and was categorized as one of the acute macular neuroretinopathies(AMNs).To date,there is still no effective approach to this *** repor... 详细信息

关键词： Acupuncture acute acupuncture

Anti-hepatitis B virus activities of natural products and their antiviral mechanisms

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Chinese Journal of Natural Medicines 2023年第11期21卷 803-811页

作者： DENG Wanyu CHEN Fu ZHAO yue zhou Ming GUO Min College of Life science Shangrao Normal UniversityShangrao 334001China BGI-shenzhen Shenzhen 518000China shenzhen Institute of synthetic Biology Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518110China Liver-biotechnology(shenzhen)Co. Ltd.Shenzhen 518110China state Key Laboratory of Natural Medicines School of Life Science&TechnologyChina Pharmaceutical UniversityNanjing 211198China

Chronic hepatitis B (CHB) infections caused by the hepatitis B virus (HBV) continue to pose a significant global public health challenge. Currently, the approved treatments for CHB are limited to interferon and nucleos(t)ide analogs, both of which have their limitations, and achieving a complete cure remains an elusive goal. Therefore, the identification of new therapeutic targets and the development of novel antiviral strategies are of utmost importance. Natural products (NPs) constitute a class of substances known for their diverse chemical structures, wide-ranging biological activities, and low toxicity profiles. They have shown promise as potential candidates for combating various diseases, with a substantial number demonstrating anti-HBV properties. This comprehensive review focuses on the current applications of NPs in the fight against HBV and provides a summary of their antiviral mechanisms, considering their impact on the viral life cycle and host hepatocytes. By offering insights into the world of anti-HBV NPs, this review aims to furnish valuable information to support the future development of antiviral drugs.

关键词： Hepatitis B virus Natural products Antiviral stategy Mechanisms Host hepatocyte Life cycle

Feasibility study of miniature near-infrared spectrometer for the measurement of solar irradiance within Arctic snow-cover sea ice

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Acta Oceanologica sinica 2020年第9期39卷 115-124页

作者： Liwen Nan Xiaoping Wang Hangzhou Wang Hongliang zhou ying Chen Ocean College Zhejiang UniversityZhoushan 316021China Zhejiang Heli Electrical Engineering Co. Ltd.Taizhou 317000China

The extremely low temperature,high humidity and limited power supply pose considerable challenges when using spectrometers within the Arctic sea *** feasibility of using a miniature low-power near-infrared spectrometer module to measure solar radiation in Arctic sea ice environments was investigated in this *** and integration time dependences of the spectrometer module were examined over the entire target operating range of–50°C to 30°C,well below the specified operating range of this *** these observations,a dark output prediction model was developed to represent dark output as a function of temperature and integration ***-induced biases in the saturation output and linear operating range of the spectrometer were also *** and integration time dependences of the signal output were *** signal output correction models were developed and compared,to convert the signal output at any temperature within the operating temperature range and integration time to that measured at the reference temperature and integration *** overall performance of the spectrometer was evaluated by integrating it into a refined fiber optic spectrometry system and measuring solar irradiance distribution in the ice cover with thickness of 1.85 m in the Arctic during the 9th Chinese National Arctic Research *** general shape of the measured solar irradiance above the snow surface agreed well with that measured by other commercial oceanographic *** measured optical properties of the sea ice were generally comparable to those of similar ice measured using other *** approach provides a general framework for assessing the feasibility of using spectrometers for applications in cold environments.

关键词： near-infrared spectrometer low-temperature Arctic sea ice

A revisit of three studies related to random testing

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science China(Information sciences) 2015年第5期58卷 49-57页

作者： CHEN Tsong yueh KUO Fei-Ching TOWEy Dave zhou Zhi Quan Department of Computer science and software Engineering Swinburne University of Technology school of Computer science The University of Nottingham Ningbo China school of Computer science and software Engineering University of Wollongong

software testing is an approach that ensures the quality of software through execution, with a goal being to reveal failures and other problems as quickly as possible. Test case selection is a fundamental issue in software testing, and has generated a large body of research, especially with regards to the effectiveness of random testing(RT), where test cases are randomly selected from the software’s input domain. In this paper, we revisit three of our previous studies. The first study investigated a sufficient condition for partition testing(PT)to outperform RT, and was motivated by various controversial and conflicting results suggesting that sometimes PT performed better than RT, and sometimes the opposite. The second study aimed at enhancing RT itself, and was motivated by the fact that RT continues to be a fundamental and popular testing technique. This second study enhanced RT fault detection effectiveness by making use of the common observation that failure-causing inputs tend to cluster together, and resulted in a new family of RT techniques: adaptive random testing(ART),which is random testing with an even spread of test cases across the input domain. Following the successful use of failure-causing region contiguity insights to develop ART, we conducted a third study on how to make use of other characteristics of failure-causing inputs to develop more effective test case selection strategies. This third study revealed how best to approach testing strategies when certain characteristics of the failure-causing inputs are known, and produced some interesting and important results. In revisiting these three previous studies, we explore their unexpected commonalities, and identify diversity as a key concept underlying their *** observation further prompted us to examine whether or not such a concept plays a role in other areas of software testing, and our conclusion is that, yes, diversity appears to be one of the most important concepts in the fie

关键词： adaptive random testing diversity metamorphic testing proportional sampling strategy random testing software testing

Folic Acid Modified Polymeric Micelles for Intravesical Instilled Chemotherapy

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Chinese Journal of Polymer science 2018年第4期36卷 479-487页

作者： Dan-Hua zhou Guan Zhang Qing-song yu Zhi-Hua Gan National University of singapore Environmental Research Institute(NERI) National University of SingaporeSingapore 117576Singapore Beijing Advanced Innovation Center for soft Matter science and Engineering State Key Laboratory of Organic-inorganic Composite MaterialsCollege of Life Science and TechnologyBeijing University of Chemical TechnologyBeijing 100029China Department of Urology China-Japan Friendship HospitalBeijing 100029China

In this study, a targeting micellar drug delivery system was developed for intravesical instilled chemotherapy of bladder cancer. The amphiphilic diblock copolymer poly（？-caprolactone）-block-poly（ethylene glycol）（PCL-b-PEO） with functional amino group（NH2） at the end of PEO block was synthesized. Then the copolymer was conjugated with folic acid（FA） and fluorescein isothiocyannate（FITC） via the PEO-NH2 terminus, and then assembled into micelles with the target moiety and fluorescence labeling. In addition, drug loaded micelles were also fabricated with anticancer drug doxorubicin（DOX） encapsulated in the hydrophobic core. The micelles were characterized in terms of size, drug loaded efficiency and critical micellization concentration（CMC） by means of DLs, UV and fluorescence spectra. In vitro cellular uptake and cytotoxicity studies showed that FA modified PCL-b-PEO-FA micelles have a greater targeting efficiency to human bladder cancer cell（T-24 cell） compared to PCL-b-PEO-NH2 micelles due to the conjugation of FA on the surface, while no targeting effect to normal tissue originated human embryonic kidney 293（HEK-293） cells was observed, enabling the micelles a promising drug carrier for intravesical instilled chemotherapy of bladder cancer.

关键词： Targeted drug delivery superficial bladder cancer Intravesical instilled chemotherapy Folic acid Micelles