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Tracking Control Design for Nonholonomic Mechanical Systems with Affine Constraints

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International Journal of Automation and computing 2014年第3期11卷 328-333页

作者： Wei Sun Yu-Qiang Wu zong-yao Sun School of Automation Southeast University Institute of Automation Qufu Normal University

The trajectory tracking control is considered for nonholonomic mechanical systems with affine constraints and dynamic friction. A new state transformation is proposed to deal with affine constraints, and then an integral feedback compensation strategy is used to identify the dynamic friction. The proposed controller ensures that the output tracking errors converge to zero as t →∞.As an application, a detailed example is presented to illustrate the effectiveness of the control scheme.

关键词： Tracking control nonholonomic systems affine constraints constraint forces integral feedback compensation

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Global output feedback regulation of time-varying nonlinear systems via the dual-gain method

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Science China(Information Sciences) 2024年第5期67卷 333-334页

作者： Xian-Long YIN zong-yao SUN Changyun WEN Institute of Automation Qufu Normal University School of Electrical and Electronic Engineering Nanyang Technological University

Notably, owing to the limited information available, the problem of output feedback stabilization/regulation for nonlinear systems has been explored based on state *** addition, the sensors accounting for state measurement could fail to detect the system states accurately due to the limitations of manufacturing techniques and instruments.

关键词： global systems method dual-gain feedback nonlinear output regulation time-varying

Coupled Responses of Sewol,Twin Barges and Slings During Salvage

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China Ocean Engineering 2018年第2期32卷 226-235页

作者： yao zong WANG Wei-ping JIANG Yan CHEN Shi-hai Shanghai Salvage Company Shanghai 200090China

Korean Sewol is successfully lifted up with the strand jack system based on twin barges. During the salvage operation, two barges and Sewol encounter offshore environmental conditions of wave, current and wind. It is inevitable that the relative motions among the three bodies are coupled with the sling tensions, which may cause big dynamic loads for the lifting system. During the project engineering phase and the site operation, it is necessary to build up a simulation model that can precisely generate the coupled responses in order to define a suitable weather window and monitor risks for the salvage operation. A special method for calculating multibody coupled responses is introduced into Sewol salvage project. Each body’s hydrodynamic force and moment in multibody configuration is calculated in the way that one body is treated as freely moving in space, while other bodies are set as fixed *** hydrodynamic force and moment are then applied into a numerical simulation model with some calibration coefficients being inserted. These coefficients are calibrated with the model test results. The simulation model built up this way can predict coupled responses with the similar accuracy as the model test and full scale measurement,and particularly generate multibody shielding effects. Site measured responses and the responses only resulted from from the simulation keep project management simultaneously to judge risks of each salvage stage, which are important for success of Sewol salvage.

关键词： salvage lifting barge coupled response numerical simulation model test site measurement

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Yokoyama procedure for a woman with heavy eye syndrome who underwent multiple recession-resection operations: A case report

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World Journal of Clinical Cases 2022年第31期10卷 11517-11522页

作者： zong yao Wen-Lan Jiang Xian Yang Department of Ophthalmology The Affiliated Hospital of Qingdao UniversityQingdao 266003Shandong ProvinceChina

BACKGROUND Heavy eye syndrome(HES)is an acquired strabismus typically seen in eyes with high *** report a classic case in which a patient was misdiagnosed with esotropia and underwent disinsertion of the medial rectus muscle and lateral rectus muscle resection *** SUMMARY A 71-year-old woman presented with both eyes fixed in adduction and infraduction for 33 *** had undergone three complicated strabismus surgeries to amputate the left medial rectus(MR)muscle with lateral rectus muscle recession,but no improvement in the esotropia appeared after each *** was diagnosed with HES and underwent a bilateral Yokoyama procedure and recession of the right MR muscle under general *** surgery,her eyes were binocularly aligned for 6 *** case suggests that pertinacious esotropia combined with high myopia must be considered in *** imaging and ultrasonography can demonstrate anatomical abnormality and mu-scle paths to confirm a definite *** The Yokoyama procedure was effective in correcting HES.

关键词： Heavy eye syndrome Esotropia Yokoyama procedure High myopia Orbital imaging Recession-resection surgery

About Operator Weighted Shift

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Acta Mathematica Sinica,English Series 2007年第8期23卷 1385-1390页

作者： Chun Lan JIANG Yong Fei JIN zong yao WANG Department of Mathematics Hebei Normal University Shifiazhuang 050016 P. R. China Department of Mathematics East China University of Science and Technology Shanghai 200237 P. R. China

Abstract Let H be a complex seperable Hilbert space and ^（Jt^） denote the collection of bounded linear operators on H. For an operator in L（H）, rad{A}＇ denotes the Jacobson radical of the commutant of A. This paper characterizes the similarity of strongly irreducible operator weighted shift in terms of {A}＇/rad{A}＇. Moreover, we suggest some ways to determine when an operator weighted shift is strongly irreducible and when its commutant is commutative.

关键词： Operator weighted shift Strongly irriducible operator Similarity Commutant Jacobson radical

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Vitreous function and intervention of it with vitrectomy and other modalities

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International Journal of Ophthalmology(English edition) 2022年第6期15卷 857-867页

作者： yao zong Qian-Ying Gao Yan-Nian Hui Department of Ophthalmology the Affiliated Hospital of Qingdao UniversityQingdao 266003Shandong ProvinceChina Vesber Vitreous Institute Guanghzou 510000Guangdong ProvinceChina Department of Ophthalmology Eye Institute of PL AXijing HospitalFourth Military Medical UniversityXi5an 710032Shaanxi ProvinceChina

The vitreous body, the largest intraocular component, plays a key role in eye development, refraction, cell barrier function, oxygen metabolism and the pathogenesis of assorted diseases. Age, refraction and systemic diseases can cause vitreous metabolic abnormalities. With the continuous development of vitrectomy techniques and equipment, vitreous injections and vitrectomies have increased over the recent decades. However, the normal oxygen tension gradient in the vitreous helps to protect the lens and anterior chamber angle from oxidative stress damage, whereas the increased vitreous oxygen tension around lens and the trabecular meshwork after vitrectomy. It may lead to postoperative nuclear cataract and increase the risk for glaucoma. As a conventional procedure, scleral buckling holds several advantages over vitrectomy in selected cases. This review raises concerns regarding the function of the vitreous and encourages conducting vitreous interventions prudently if it is possible.

关键词： vitreous function oxygen metabolism vitrectomy scleral buckling

Vitreous function and intervention of it with vitrectomy and other modalities

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International Journal of Ophthalmology(English edition) 2021年第10期14卷 1610-1618页

作者： yao zong Qian-Ying Gao Yan-Nian Hui Department of Ophthalmology the Affiliated Hospital of Qingdao UniversityQingdao 266003Shandong ProvinceChina Vesber Vitreous Institute Guangzhou 510000Guangdong ProvinceChina Department of Ophthalmology Eye Institute of PLAXijing HospitalFourth Military Medical UniversityXi’an 710032Shaanxi ProvinceChina

The vitreous body,the largest intraocular component,plays a key role in eye development,refraction,cell barrier function,oxygen metabolism and the pathogenesis of assorted ***,refraction and systemic diseases can cause vitreous metabolic *** the continuous development of vitrectomy techniques and equipment,vitreous injections and vitrectomies have increased over the recent ***,the normal oxygen tension gradient in the vitreous helps to protect the lens and anterior chamber angle from oxidative stress damage,whereas the increased vitreous oxygen tension around lens and the trabecular meshwork after vitrectomy may lead to postoperative nuclear cataract and a high incidence of open angle *** a conventional procedure,scleral buckling holds several advantages over vitrectomy in selected *** review raises concerns regarding the function of the vitreous,and encourages conducting vitreous interventions prudently.

关键词： vitreous function oxygen metabolism vitrectomy scleral buckling

Effect of emodin and sandostatin on metabolism of eicosanoids in acute necrotizing pancreatitis

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World Journal of Gastroenterology 2000年第2期6卷 293-294页

作者： Jian Xin Wu Jia Yu Xu yao zong Yuan Department of Gastroenterology Shanghai First People’s HospitalShanghai 200080China Ruijin Hospital Shanghai Second Medical UniversityShanghai 200025China

INTRODUCTIONIn order to study the therapeutic mechanisms ofemodin,an extract of Rhubarb （Rhizoma et RadixRhei,a traditional Chinese herbal medicine）,andsandostatin in the treatment of acute necrotizingpancreatitis （ANP）,we used the two drugs in ratmodels of the disease and observed the changes ofplasma thromboxane-2（TXB2）,6-keto-prostaglandin F1α(6-keto-PGF1α)and prostaglandinE2（PEG2）.

关键词： pancreatitis eicosanoids metabolism emodin sandostatin

Robust control of high-order nonlinear systems with unknown measurement sensitivity

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Science China(Information Sciences) 2021年第6期64卷 236-238页

作者： Cai-Yun LIU zong-yao SUN Qinghua MENG Wei SUN Institute of Automation Qufu Normal University School of Mechanical Engineering Hangzhou Dianzi University School of Mathematics Science Liaocheng University

Dear editor,Recently, considerable attention has been devoted to output feedback control and practical tracking of nonlinear systems [1, 2]. Unfortunately, limitations of sensor techniques can cause sensitivity errors in practical environments. For example, Ref. [3] showed that the displacement sensor of a magnetic bearing suspension system experienced ±10%sensitivity error in practice. Thus, investigating nonlinear systems with unknown measurement sensitivity is valuable.

关键词： Robust control of high-order nonlinear systems with unknown measurement sensitivity