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Control Theory and technology 2025年第1期23卷 64-73页

作者： Viet nguyen Hoang Feiqi Deng Chi nguyen Van School of Automation Science and Engineering South China University of TechnologyGuangzhou510640GuangdongChina thai nguyen university of technology Thai Nguyen CityVietnam

This article presents an adaptive optimal control method for a semi-active suspension *** model of the suspension system is built,in which the components of uncertain parameters and exogenous disturbance are *** adaptive optimal control law consists of the sum of the optimal control component and the adaptive control ***,the optimal control law is designed for the model of the suspension system after ignoring the components of uncertain parameters and exogenous disturbance caused by the road *** optimal control law expresses the desired dynamic characteristics of the suspension ***,the adaptive component is designed with the purpose of compensating for the effects caused by uncertain parameters and exogenous disturbance caused by the road surface;the adaptive component has adaptive parameter rules to estimate uncertain parameters and exogenous *** exogenous disturbances are eliminated,the system responds with an optimal controller *** separating theoretically the dynamic of a semi-active suspension system,this solution allows the design of two separate controllers easily and has reduced the computational burden and the use of too many tools,thus allowing for more convenient hardware *** simulation results also show the effectiveness of damping oscillations of the proposed solution in this article.

关键词： Quarter car suspension system Semi-active suspension Adaptive control Optimal control Linear-quadratic regulator Exogenous disturbance

Noetherian Dimension and Co-localization of Artinian Modules over Local Rings

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Algebra Colloquium 2014年第4期21卷 663-670页

作者： Le Thanh Nhan Tran Do Minh Chau thai nguyen College of Sciences Thai Nguyen Vietnam

Let （R,m） be a Noetherian local ring. Denote by N-dimnA the Noetherian dimension of an Artinian R-module A. In this paper, we give some characterizations for the ring R to satisfy N-dimRA = dim（R/AnnRA） for certain Artinian R-modules A. Then the existence of a co-localization compatible with Artinian R-modules is studied and it is shown that if it is compatible with local cohomologies of finitely generated modules, then the base ring is universally catenary and all of its formal fibers are Cohen-Macaulay.

关键词： Artinian modules co-localization going up formal fibers

NORMAL FAMILY OF MEROMORPHIC FUNCTIONS SHARING HOLOMORPHIC FUNCTIONS AND THE CONVERSE OF THE BLOCH PRINCIPLE

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Acta Mathematica Scientia 2017年第3期37卷 623-656页

作者： nguyen Van THIN Department of Mathematics Thai Nguyen University of EducationLuong Ngoc Quyen StreetThai Nguyen cityThai NguyenViet Nam

In 1996, C. C. Yang and P. C. Hu [8] showed that： Let f be a transcendental meromorphic function on the complex plane, and a ≠ 0 be a complex number; then assume that n 〉 2, n1,… , nk are nonnegative integers such that n1＋… ＋ nk ≥1; thus fn（f′）n1…（f（k））nk-a has infinitely zeros. The aim of this article is to study the value distribution of differential polynomial, which is an extension of the result of Yang and Hu for small function and all zeros of f having multiplicity at least k ≥2. Namely, we prove that fn（f′）n1…（f（k））nk-a（z） has infinitely zeros, where f is a transcendental meromorphic function on the complex plane whose all zeros have multiplicity at least k≥ 2, and a（z） 0 is a small function of f and n ≥ 2, n1,… ,nk are nonnegative integers satisfying n1＋ …＋ nk ≥1. Using it, we establish some normality criterias for a family of meromorphic functions under a condition where differential polynomials generated by the members of the family share a holomorphic function with zero points. The results of this article are supplement of some problems studied by d. Yunbo and G. Zongsheng [6], and extension of some problems studied X. Wu and Y. Xu [10]. The main result of this article also leads to a counterexample to the converse of Bloeh＇s principle.

关键词： Normal family Nevanlinna theory meromorphic function sharing function differential pOlynomial

Optimal Operation of Energy Hub Based Micro-energy Network with Integration of Renewables and Energy Storages

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Journal of Modern Power Systems and Clean Energy 2022年第1期10卷 100-108页

作者： Thanhtung Ha Ying Xue Kaidong Lin Yongjun Zhang Vu Van Thang Thanhha nguyen Department of Electric Power Systems Thai Nguyen University of Technology(TNUT)Thai NguyenVietnam university of Birmingham BirminghamU.K School of Electric Power South China University of TechnologyGuangzhouChina thai nguyen university Thai NguyenVietnam

This study proposes an optimized model of a micro-energy network(MEN)that includes electricity and natural gas with integrated solar,wind,and energy storage systems(ESSs).The proposed model is based on energy hubs(EHs)and it aims to minimize operation costs and greenhouse *** research is motivated by the increasing use of renewable energies and ESSs for secure energy supply while reducing operation costs and environment effects.A general algebraic modeling system(GAMS)is used to solve the optimal operation problem in the *** results demonstrate that an optimal MEN formed by multiple EHs can provide appropriate and flexible responses to fluctuations in electricity prices and adjustments between time periods and *** also yields significant reductions in operation costs and *** proposed model can contribute to future research by providing a more efficient network model(as compared with the traditional electricity supply system)to scale down the environmental and economic impacts of electricity storage and supply systems on MEN operation.

关键词： Micro-energy network(MEN) natural gas price electricity price energy hub(EH) renewables energy storage optimal operation

A Modified Three-Term Conjugate Gradient Algorithm for Large-Scale Nonsmooth Convex Optimization

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Computers, Materials & Continua 2020年第2期62卷 787-800页

作者： Wujie Hu Gonglin Yuan Hongtruong Pham College of Mathematics and Information Science Guangxi UniversityNanningChina thai nguyen university of Economics and Business Administration Thai NguyenVietnam

It is well known that Newton and quasi-Newton algorithms are effective to small and medium scale smooth problems because they take full use of corresponding gradient function’s information but fail to solve nonsmooth *** perfect algorithm stems from concept of‘bundle’successfully addresses both smooth and nonsmooth complex problems,but it is regrettable that it is merely effective to small and medium optimization models since it needs to store and update relevant information of parameter’s *** conjugate gradient algorithm is effective both large-scale smooth and nonsmooth optimization model since its simplicity that utilizes objective function’s information and the technique of Moreau-Yosida ***,a modified three-term conjugate gradient algorithm was proposed,and it has a sufficiently descent property and a trust region *** the same time,it possesses the global convergence under mild assumptions and numerical test proves it is efficient than similar optimization algorithms.

关键词： Conjugate gradient large-scale trust region global convergence

Energy hub modeling to minimize residential energy costs considering solar energy and BESS

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Journal of Modern Power Systems and Clean Energy 2017年第3期5卷 389-399页

作者： Thanhtung HA Yongjun ZHANG V.V.THANG Jianang HUANG School of Electric Power South China University of Technology GuangzhouGuangzhouChina Department of Electric Power Systems Thai Nguyen University of Technology(TNUT)Thai NguyenVietnam

This paper aims to optimize total energy costs in an operational model of a novel energy hub(EH) in a residential area. The optimization problem is set up based on daily load demand(such as electricity, heat, and cooling) and time-of-use(TOU) energy prices. The extended EH model considers the involvement of solar photovoltaic(PV) generation, solar heat exchanger(SHE), and a battery energy storage system(BESS). A mathematical model is constructed with the objective of optimizing total energy cost during the day, including some constraints such as input-output energy balance of the EH, electricity price,capacity limitation of the system, and charge/discharge power of BESS. Four operational cases based on different EH structures are compared to assess the effect of solar energy applications and BESS on the operational efficiency. The results show that the proposed model predicts significant changes to the characteristics of electricity and gas power bought from utilities, leading to reduced total energy cost compared to other cases. They also indicate that the model is appropriate for the characteristics of residential loads.

关键词： Natural gas price Electricity price Energy Hub Optimal operation General algebraic modeling system(GAMS) Solar Battery energy storage system(BESS)

Combining Entropy Optimization and Sobel Operator for Medical Image Fusion

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Computer Systems Science & Engineering 2023年第1期44卷 535-544页

作者： nguyen Tu Trung Tran Thi Ngan Tran Manh Tuan To Huu nguyen Faculty of Computer Science and Engineering Thuyloi University175 Tay SonDong DaHanoi010000Vietnam university of Information and Communication technology Thai Nguyen UniversityThai Nguyen240000Vietnam

Fusing medical images is a topic of interest in processing medical *** is achieved to through fusing information from multimodality images for the purpose of increasing the clinical diagnosis *** fusion aims to improve the image quality and preserve the specific *** methods of medical image fusion generally use knowledge in many differentfields such as clinical medicine,computer vision,digital imaging,machine learning,pattern recognition to fuse different medical *** are two main approaches in fusing image,including spatial domain approach and transform domain *** paper proposes a new algorithm to fusion multimodal *** algorithm is based on Entropy optimization and the Sobel *** transform is used to split the input images into components over the low and high frequency ***,two fusion rules are used for obtaining the fusing *** rule,based on the Sobel operator,is used for high frequency *** second rule,based on Entropy optimization by using Particle Swarm Optimization(PSO)algorithm,is used for low frequency *** algorithm is implemented on the images related to central nervous system *** experimental results of the paper show that the proposed algorithm is better than some recent methods in term of brightness level,the contrast,the entropy,the gradient and visual informationfidelity for fusion(VIFF),Feature Mutual Information(FMI)indices.

关键词： Medical image fusion wavelet entropy optimization PSO Sobel operator

Dietary encapsulated essential oils and organic acids mixture improves gut health in broiler chickens challenged with necrotic enteritis

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Journal of Animal Science and Biotechnology 2020年第3期11卷 866-883页

作者： Van Hieu Pham Liugang Kan Jinyu Huang Yanqiang Geng Wenrui Zhen Yuming Guo Waseem Abbas Zhong Wang State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China Faculty of Animal Science and Veterinary Medicine Thai Nguyen University Agriculture and ForestryThai NguyenVietnam Menon Animal Nutrition technology Co.Ltd. ShanghaiChina

Background:The poultry industry is in need of effective antibiotic alternatives to control outbreaks of necrotic enteritis(NE)due to Clostridium *** the present study,we investigated the effects of dietary supplementation with a blend of encapsulated essential oils and organic acids(BLJ)on growth performance and gut health using a coinfection model of NE in broiler ***:Two hundred and eighty-eight one-day-old male Arbor Acres broiler chicks were randomly assigned using a 2×2 factorial design into two groups fed either 0 or 500 mg/kg dietary BLJ and co-challenged(or not challenged for the control)with Eimeria spp./***:Infected birds fed the BLJ-supplemented diet exhibited an improved feed conversion ratio throughout the trial(P<0.01),a higher villus height and villus height/crypt depth ratio,and reduced intestinal *** counts,liver *** carriage,gut lesion scores and serum fluorescein isothiocyanate dextran(FITC-D)concentrations at 7 d postinfection compared with those of birds without BLJ supplementation(P<0.05).NE-infected birds fed BLJ exhibited significantly upregulated claudin-1 and IGF-2 mRNA levels(P<0.05),increased A20 mRNA expression and significantly downregulated TRAF-6,TNFSF15 and TOLLIP mRNA levels in the jejunum at 7 d post-infection compared with those in birds without BLJ supplementation(P<0.05).Compared with the uninfected and untreated birds,the uninfected birds fed BLJ displayed increased relative abundances of Lactobacillus and Coprococcus but reduced Rikenellaceae *** with the unsupplemented NE-challenged birds,infected birds fed BLJ showed an increased relative abundance of Unclassified_Lachnospiraceae and a significantly decreased relative abundance of ***:BLJ supplementation improved growth performance and gut health in NE-infected broiler chickens by strengthening the intestinal barrier function,positively modulating the gut microbiota community

关键词： Broiler chickens Clostridium perfringens Essential oils and organic acids Gut health

Language Environment Setting Through Our Foreign Currency Activities to Improve Chinese-Majoring Learners’ Competency

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Sino-US English Teaching 2019年第2期16卷 64-74页

作者： Mai Thi Ngoc Anh thai nguyen university Thai Nguyen ProvinceVietnam

Language education centers primarily on fostering linguistic skills and language communication skills for students. In the process of teaching Chinese language, it is in the classroom that is the place tofoster student’s linguistic competence and language communication capacity. Therefore, classroom teaching becomes the main place tofoster the language ability and language communication capacity for students while the extracurricular activities are the place for students to apply the knowledge they have learned in the classroom in to the real world. Conducting a survey to investigate extracurricular activities for Chinese language majors at thai nguyen university, School of Foreign Languages, the paper proposes solutions to improve the effectiveness of extracurricular activities for students and create excitement for students in learning.

关键词： setting language learning environment efficiency excitement extracurricular activities Chinese

Automatic Identification Fingerprint Based on Machine Learning Method

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Journal of the Operations Research Society of China 2022年第4期10卷 849-860页

作者： Long The nguyen Huong Thu nguyen Alexander Diomidovich Afanasiev Tao Van nguyen Laboratory of Artificial Intelligence and Machine Learning Institute of Information Technology and Data ScienceIrkutsk National Research Technical UniversityIrkutskRussia Baikal School of BRICS Irkutsk National Research Technical UniversityIrkutskRussia university of Information and Communication technology Thai Nguyen UniversityThai NguyenViet Nam

The fingerprint identification technology has been developed and applied effectively to security systems in financial transactions,personal information security,national security,and other *** this paper,we proposed the development of a fingerprint identification system based on image processing methods that clarify fingerprint contours,using machine learning methods to increase processing speed and increase the accuracy of the fingerprint identification *** identification system consists of the following main steps:improving image quality and image segmentation to identify the fingerprint area,extracting features,and matching the *** accuracy of the system reached 97.75%on the mixed high-and low-quality fingerprint database.

关键词： Fingerprint identification Feature extraction Image segmentation Wavelet transform Neural network algorithm Machine learning