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Design and performance analysis of networked control systems with random delay

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Journal of Systems Engineering and Electronics 2009年第4期20卷 807-822页

作者： Xia Yuanqing Fu Mengyin liu Bo liu guoping Dept. of Automatic Control Beijing Inst. of Technology Beijing 100081 P. R. China Dept. of Engineering Univ. of Glamorgan Pontypridd CF37 1DL U. K.

The design and performance analysis of networked control systems with random network delay in the forward channel is proposed, which are described in a state-space form. A new control scheme is used to overcome the effects of network transmission delay, which is termed networked predictive control （NPC）. Furthermore, three different ways to choose control input are discussed and the performances are analyzed, respectively. Both real-time simulations and practical experiments show the effectiveness of the control scheme.

关键词： networked control system. Dredictive control random network delay stability

Data-Based Predictive Control for Networked Nonlinear Systems with Packet Dropout and Measurement Noise

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Journal of Systems Science & Complexity 2017年第5期30卷 1072-1083页

作者： PANG Zhonghua liu guoping ZHOU Donghua SUN Dehui Key Laboratory of Fieldbus Technology and Automation of Beijing North China University of Technology School of Engineering University of South Wales CTGT Center Harbin Institute of Technology College of Electrical Engineering and Automation Shandong University of Science and Technology Department of Automation Tsinghua University

In this paper, the data-based control problem is investigated for a class of networked nonlinear systems with measurement noise as well as packet dropouts in the feedback and forward channels. The measurement noise and the number of consecutive packet dropouts in both channels are assumed to be random but bounded. A data-based networked predictive control method is proposed, in which a sequence of control increment predictions are calculated in the controller based on the measured output error, and based on the control increment predictions received by the actuator, a proper control action is obtained and applied to the plant according to the real-time number of consecutive packet dropouts at each sampling instant. Then the stability analysis is performed for the networked closedloop system. Finally, the effectiveness of the proposed method is illustrated by a numerical example.

关键词： Data-based control measurement noise networked control systems (NCSs) packet dropout predictive control

A Novel Networked Predictive Control Method for Systems with Random Communication Constraints

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Journal of Systems Science & Complexity 2021年第4期34卷 1364-1378页

作者： PANG Zhonghua BAI Chuandong liu guoping HAN Qinglong ZHANG Xianming Key Laboratory of Fieldbus Technology and Automation of Beijing North China University of TechnologyBeijing 100144China Department of Artificial Intelligence and Automation Wuhan UniversityWuhan 430072China School of Software and Electrical Engineering Swinburne University of TechnologyMelbourneVIC 3122Australia

This paper presents a novel observer-based predictive control method for networked systems where random network-induced delays,packet disorders and packet dropouts in both feedback and forward channels are *** proposed method has three significant features:i)A concept of destination-based lumped(DBL)delay is introduced to represent the combined effects of random communication constraints in each channel;ii)in view of different natures of the random DBL delays in the feedback and forward channels,different compensation schemes are designed;and iii)it is actual control inputs rather than predicted ones that are employed to generate future control signals based on the latest system state estimate available in the *** the resulting closed-loop system,a necessary and sufficient stability condition is derived,which is less conservative and also independent of random communication constraints in both *** results are provided to demonstrate the effectiveness of the proposed method.

关键词： Networked control systems(NCSs) network-induced delay networked predictive control packet disorder packet dropout

Symptom selection for multi-label data of inquiry diagnosis in traditional Chinese medicine

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Science China(Information Sciences) 2013年第5期56卷 238-250页

作者： SHAO Huan LI GuoZheng liu guoping WANG YiQin School of Computer Engineering and Science Shanghai University Department of Control Science and Engineering Key Laboratory of Ministry of Education for Service Computing and Embedded SystemsTongji University Laboratory of Information Access and Synthesis of TCM Four Diagnosis Shanghai University of Traditional Chinese Medicine

In traditional Chinese medicine(TCM) diagnosis,a patient may be associated with more than one syndrome tags,and its computer-aided diagnosis is a typical application in the domain of multi-label learning of high-dimensional *** is common that a great deal of symptoms can occur in traditional Chinese medical diagnosis,which affects the modeling of diagnostic *** selection entails choosing the smallest feature subset of relevant symptoms,and maximizing the generalization performance of the *** present there are rare researches on feature selection on multi-label data.A hybrid optimization technique is introduced to symptom selection for multi-label data in TCM diagnosis in this paper,and modeling is made by means of four multi-label learning algorithms like k nearest neighbors,*** compare the performance of the algorithm with the current popular dimension reduction algorithms like MEFS(embedded feature selection for multi-Label learning),MDDM(multi-label dimensionality reduction via dependence maximization) on the UCI Yeast gene functional data set and an inquiry diagnosis dataset of coronary heart disease(CHD).Experimental results show that the algorithm we present has significantly improved the *** particular,the improvement on the average precision for the classifier is up to 10.62% and 14.54%.Syndrome inquiry modeling of CHD in TCM is realized in this paper,providing effective reference for the diagnosis of CHD and analysis of other multi-label data.

关键词： multi-label learning feature selection high-dimensionality inquiry of traditional Chinese medicine coronary heart disease

An Orthogonal Approach to Reusable Component Discovery in Cloud Migration

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China Communications 2015年第5期12卷 134-151页

作者： ZHAO Junfeng ZHOU Jiantao YANG Hongji liu guoping College of Computer Science Inner Mongolia University Hohhot Centre for Creative Computing Bath Spa University Bath Advanced Control and Network Technology Research Unit University of South Wales

As an innovative software application mode,Software as a service(SaaS) shows many attractive *** legacy system to SaaS can make outdated systems *** the process of migration,the existing valuable components need to be discovered and reused in order that the target system could be developed/integrated more *** innovative approach is proposed in this paper to extract the reusable components from legacy ***,implementation models of legacy system are recovered through reverse ***,function models are derived by vertical clustering,and then logical components are discovered by horizontal clustering based on the function ***,the reusable components with specific feature descriptions are *** experimental verification,the approach is considered to be efficient in reusable component discovery and to be helpful to migrating legacy system to SaaS.

关键词： legacy system architecture recovery horizontal clustering vertical clustering, reusable component

Developmental Origins of Human Cortical Oligodendrocytes and Astrocytes

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Neuroscience Bulletin 2022年第1期38卷 47-68页

作者： Lin Yang Zhenmeiyu Li guoping liu Xiaosu Li Zhengang Yang State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science Institutes of Brain ScienceInstitute for Translational Brain Researchand Department of NeurologyZhongshan HospitalFudan UniversityShanghai200032China

Human cortical radial glial cells are primary neural stem cells that give rise to cortical glutaminergic projection pyramidal neurons, glial cells (oligodendrocytes and astrocytes) and olfactory bulb GABAergic interneurons. One of prominent features of the human cortex is enriched with glial cells, but there are major gaps in understanding how these glial cells are generated. Herein, by integrating analysis of published human cortical single-cell RNA-Seq datasets with our immunohistochemistical analyses, we show that around gestational week 18, EGFR-expressing human cortical truncated radial glial cells (tRGs) give rise to basal multipotent intermediate progenitors (bMIPCs) that express EGFR, ASCL1, OLIG2 and OLIG1. These bMIPCs undergo several rounds of mitosis and generate cortical oligodendrocytes, astrocytes and olfactory bulb interneurons. We also characterized molecular features of the cortical tRG. Integration of our findings suggests a general picture of the lineage progression of cortical radial glial cells, a fundamental process of the developing human cerebral cortex.

关键词： Radial glial cell Intermediate progenitor cell EGFR HOPX Oligodendrocyte Astrocyte Olfactory bulb interneuron Cerebral cortex Human

Modeling and identification of a PEM fuel cell humidification system

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控制理论与应用（英文版） 2009年第4期7卷 373-378页

作者： Xianrui DENG guoping liu George WANG Min TAN Departrnent of Computer Tangshan Teacher＇s College Tangshan Hebei 063000 China Lab of Complex Systems and Intelligence Science Chinese Academy of Sciences Beijing 100080 China School of Electronics University of Glamorgan Pontypridd CF37 1DL UK National Research council Vancouver Canada

A theoretical model of a humidifier of proton exchange membrane （PEM） fuel cell systems is developed and analyzed first in this paper. The model shows that there exists a strong nonlinearity in the system. Then, the system is identified using a wavelet networks method. To avoid the curse-of-dimensionality problem, a class of wavelet networks proposed by Billings is employed. The experimental data acquired from the test bench are used for identification. The one-step-ahead predictions and the five-step-ahead predictions are compared with the real measurements, respectively. It shows that the identified model can effectively describe the real system.

关键词： Modelling Identification Neural networks PEM fuel cell Humidification system

Metamorphic Rock-hosted Disseminated Gold Deposits——A Case Study of the Xiaotongjiapuzi Gold Depositof Eastern Liaoning

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Acta Geologica Sinica(English Edition) 1999年第4期73卷 429-437页

作者： liu guoping AI Yongfu FENG Kezhu ZHANG Zhimin Beijing Institute of Geology for Mineral Resources CNNC Beijing 100012 Department of Geology Peking University Beijing 100871 No. 103 Geological Party Liaoning Bureau of Geological Exploration CNNC Dandong Liaoning 118008

The Xiaotongjiapuzi gold deposit occurs in a Palaeoproterozoic rift accretionary terrane in eastern Liaoning and is hosted by a carbonate formation of the Dashiqiao Formation, Liaohe Group. The metamorphic grade of the host rock is low amphibolite-high greenschist facies. Gold, which is mainly invisible, is distributed in pyrite and arsenopyrite. The grains of Au-bearing sulphide minerals are fine, ranging from 0.0 n to 1 mm. The wall-rock alterations are characterized by low-temperature silification, hydro-sericitization, sericitization and carbonatization. The homogenization temperatures of the fluid inclusions in quartz closely associated with gold mineralization range from 140 to 240°C. The metallogenic age represented by the Ar-Ar isotopic age of sericite is 167 Ma. Comparisons and studies show that the Xiaotongjiapuzi gold deposit can be classified as the submicron-sized disseminated deposit (analogous to the Carlin-type) hosted in metamorphic rocks.

关键词： disseminated gold deposit eastern Liaoning metamorphic rock

Spatial and Temporal Distribution of Au and Pb-Zn Mineralization:Phenomenon,Mechanism and Implication

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Acta Geologica Sinica(English Edition) 2000年第3期74卷 504-510页

作者： WANG Dongbo SHAO Shicai XU Yong liu guoping Beijing Institute of Geology for Mineral Resources Beijing 100012 State Nonferrous Metals Industry Administration Beijing 100814

In the 1990s, some median-large gold deposits have been discovered in several lead-zinc metallogenetic belts (e.g. the Qinling lead-zinc metallogenetic belt, Shanxi Province and Gansu Province and the Qingchengzi lead-zinc ore field, Liaoning Province) in China. Gold deposits and lead-zinc deposits spatially co-exist in the same tectonic setting; lead-zinc orebodies are commonly located below gold ore bodies. The host rocks of lead-zinc ore-bodies are conformably overlain by those of gold ore bodies. The age of gold mineralization is obviously younger than that of lead-zinc mineralization. Preliminary geochemical research has demonstrated the following: lead-zinc mineralization took place in a marine sedimentary-exhalative system, which had the characteristics of a high fluid/rock ratio, a high salinity and a high halide activity; meanwhile, most of gold was transported into the low-temperature hydrothermal plume and primarily enriched in sediments. During later (magmatism-) metamorphism- tectonism, gold was remobilized and transported into the metamorphic fluid which had the characteristics of medium- high temperatures, a low fluid/rock ratio and a low activity of halide, and precipitated at a favourable structural site. Therefore, the co-existence of gold and lead-zinc deposits and the separation of gold from lead-zinc result from the differences of chemical composition and circulation of ore fluids in the same tectonic unit. This phenomenon can be used as an important criterion in exploration.

关键词： gold deposit lead-zinc deposit spatial-temporal distribution ore fluid