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A Hybrid Immigrants Scheme for Gene.ic Algorithms in Dynamic environments

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International Journal of Automation and computing 2007年第3期4卷 243-254页

作者： Shengxiang Yang Renato tinós department of Computer Science University of LeicesterLeicester LE1 7RHUK department of Physics and Mathematics FFCLRPUniversity of Sao PauloRibeir Preto 14040-901Brazil

Dynamic optimization problems are a kind of optimization problems that involve changes over time. They pose a serious challenge to traditional optimization methods as well as conventional gene.ic algorithms since the goal is no longer to search for the optimal solution（s） of a fixed problem but to track the moving optimum over time. Dynamic optimization problems have attracted a growing interest from the gene.ic algorithm community in recent years. Several approaches have been developed to enhance the performance of gene.ic algorithms in dynamic environments. One approach is to maintain the diversity of the population via random immigrants. This paper proposes a hybrid immigrants scheme that combines the concepts of elitism, dualism and random immigrants for gene.ic algorithms to address dynamic optimization problems. In this hybrid scheme, the best individual, i.e., the elite, from the previous generation and its dual individual are retrieved as the bases to create immigrants via traditional mutation scheme. These elitism-based and dualism-based immigrants together with some random immigrants are substituted into the current population, replacing the worst individuals in the population. These three kinds of immigrants aim to address environmental changes of slight, medium and significant degrees respectively and hence efficiently adapt gene.ic algorithms to dynamic environments that are subject to different severities of changes. Based on a series of systematically constructed dynamic test problems, experiments are carried out to investigate the performance of gene.ic algorithms with the hybrid immigrants scheme and traditional random immigrants scheme. experimental results validate the efficiency of the proposed hybrid immigrants scheme for improving the performance of gene.ic algorithms in dynamic environments.

关键词： Gene.ic algorithms random immigrants elitism-based immigrants dualism dynamic optimization problems.

Toward Cloud Computing QoS Architecture:Analysis of Cloud Systems and Cloud Services

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Ieee/CAA Journal of Automatica Sinica 2017年第1期4卷 6-18页

作者： Mohammad Hossein Ghahramani MengChu Zhou Chi tin Hon Ieee Institute of Systems engineering Macao University of Science and Technology Helen and John C. Hartmann department of electrical and Computer engineering New Jersey Institute of Technology School of Management Fudan University

Cloud can be defined as a new computing paradigm that provides scalable, on-demand, and virtualized resources for users. In this style of computing, users can access a shared pool of computing resources which are provisioned with minimal management efforts of users. Yet there are some obstacles and concerns about the use of clouds. Guaranteeing quality of service QoS by service providers can be regarded as one of the main concerns for companies tending to use it. Service provisioning in clouds is based on service level agreements representing a contract negotiated between users and providers. According to this contract, if a provider cannot satisfy its agreed application requirements, it should pay penalties as compensation. In this paper, we intend to carry out a comprehensive survey on the models proposed in literature with respect to the implementation principles to address the QoS guarantee issue. © 2014 Chinese Association of Automation.

关键词： Cloud computing Distributed computer systems System of systems Systems engineering Telecommunication services Web services

DOMAIN deCOMPOSITION WITH NONMATCHING GRIDS FOR eXTeRIOR TRANSMISSION PROBLeMS VIA FeM AND DTN MAPPING

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Journal of Computational Mathematics 2006年第3期24卷 323-342页

作者： Ju-e Yang de-hao Yu LSeC ICMSEC Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 China

In this paper, we are concerned with a non-overlapping domain decomposition method （DDM） for exterior transmission problems in the plane. Based on the natural boundary integral operator, we combine the DDM with a Dirichlet-to-Neumann （DtN） mapping and provide the nume.ical analysis with nonmatching grids. The weak continuity of the approximation solutions on the interface is imposed by a dual basis multiplier. We show that this multiplier space can generate optimal error estimate and obtain the corresponding rate of convergence. Finally, several nume.ical examples confirm the theore.ical results.

关键词： Domain decomposition Nature boundary element Nonmatching grids Weakcontinuity D-N alternating Dual basis Projection operator error estimate.

A memristive map with coexisting chaos and hyperchaos

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Chinese Physics B 2021年第11期30卷 286-296页

作者： Sixiao Kong Chunbiao Li Shaobo He Serdar C¸ic¸ek Qiang Lai Jiangsu Collaborative Innovation Center of Atmosphe.ic environment and equipment Technology(CicAeeT) Nanjing University of Information Science&TechnologyNanjing 210044China School of Artificial Intelligence Nanjing University of Information Science&TechnologyNanjing 210044China School of Physics and electronics Central South UniversityChangsha 410083China department of electronic&Automation Vocational School of Hacıbektas¸Nevs¸ehir HacıBektas¸Veli UniversityHacıbektas¸50800Nevs¸ehirTurkey School of electrical and Automation engineering East China Jiaotong UniversityNanchang 330013China

By introducing a discrete memristor and periodic sinusoidal functions,a two-dimensional map with coexisting chaos and hyperchaos is *** coexisting chaotic and hyperchaotic attractors under different Lyapunov exponents are firstly found in this discrete map,along with which other regimes of coexistence such as coexisting chaos,quasiperiodic oscillation,and discrete periodic points are also *** hyperchaotic attractors can be flexibly controlled to be unipolar or bipolar by newly embedded constants meanwhile the amplitude can also be controlled in combination with those coexisting *** on the nonlinear auto-regressive model with exogenous inputs(NARX)for neural network,the dynamics of the memristive map is well pre.icted,which provides a potential passage in artificial intelligencebased applications.

关键词： memristor hyperchaos coexisting attractors amplitude control neural network

Dipole (hyper)polarizabilities of neutral silver clusters

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Chinese Physics B 2016年第12期25卷 217-222页

作者： Francisco e Jorge Luiz G M de Macedo departarnento de Fisica Universidade Fedoral do Espirito Santo 29060-900 Vitoria Brazil Unidade Acade.ica de Fisica Universidade Federal de Campina Grande 58429-900 Campina Grande Brazil Faculdade de Biotecnologia ICB Universidade Federal do Para 66075-110 Belem Brazil

At the Douglas-Kroll-Hess （DKI4） level, the B3PW91 functional along with the all-eleclron relativistic basis sets of valence triple and quadruple zeta qualities are used to determine the structure, stability, and electronic properties of the small silver clusters （Agn, n ≤ 7）. The results presented in this study are in good agreement with the experimental data and theore.ical values obtained at a higher level of theory from the literature. Static polarizability and hyperpolarizability are also reported. It is verified that the mean dipole polarizability per atom exhibits an odd-even oscillation and that the polarizability anisotropy is directly related to the cluster shape. In this article, the first study of hyperpolarizabilities of small silver clusters is presented. except for the monomer, the second hyperpolarizabilities of the silver clusters are significantly larger than those of the copper clusters.

关键词： B3PW91 functional all-electron basis sets non-relativistic and DKH2 calculations silver clusters,dipole (hyper)polarizabilities

Adynamic and dynamic muscle transposition techniques for anal incontinence

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Gastroenterology Report 2014年第2期2卷 98-105页

作者： Goran Barišic Zoran Krivokapic Clinic for Digestive Surgery First Surgical ClinicBelgrade School of MedicineUniversity of BelgradeSerbia

Gracilis muscle transposition is well established in general surgery and has been the main muscle transposition technique for anal ***,through a schedule of continuous electrical stimulation,converts the fatigue-prone muscle fibres to a tonic fatigue-resistant morphology with acceptable results in those cases where there is limited sphincter muscle *** differences between gluteoplasty and graciloplasty,as well as the techniques and complications of both procedures,are outlined in this ***,these techniques are rarely carried out in specialized units with experience,as there is a high revision and explantation rate.

关键词： anal incontinence muscle transposition gluteoplasty graciloplasty dynamization

NiFeRuO_(x)nanosheets on Ni foam as an electrocatalyst for efficient overall alkaline seawater splitting

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Frontiers of Che.ical Science and engineering 2023年第11期17卷 1698-1706页

作者： Yu Liu Lin Chen Yong Wang Yuan Dong Liang Zhou Susana icórdoba de Torresi Kenneth IOzoemena Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing&International School of Materials Science and engineering&School of Materials Science and engineering&Shenzhen Research Institute&Laoshan Laboratory Wuhan University of TechnologyWuhan 430070China Instituto de Química Universidade de São Paulo05508-080 São PauloBrazil Molecular Sciences Institute School of ChemistryUniversity of the WitwatersrandJohannesburg 2050South Africa

The electrocatalyst NiFeRuO_(x)/NF,comprised of NiFeRuO_(x)nanosheets grown on Ni foam,was synthesized using a hydrothermal process followed by thermal ***_(x)/NF displays high electrocatalytic activity and stability for overall alkaline seawater splitting:98 mV@10 mA∙cm^(−2)in hydrogen evolution reaction,318 mV@50 mA∙cm^(−2)in oxygen evolution reaction,and a cell voltage of 1.53 V@10 mA∙cm^(−2),as well as 20 h of durability.A solar-driven system containing such a bifunctional NiFeRuO_(x)/NF has an almost 100%Faradaic *** NiFeRuO_(x)coating around Ni foam is an anti-corrosion layer and also a critical factor for enhancement of bifunctional performances.

关键词： NiFeRuO_(x)nanosheets Ni foam electrocatalysis overall seawater splitting solar-driven system

enhancing perianal disease management with integrated physical and psychological approaches

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World Journal of Clinical Cases 2025年第2期13卷 59-63页

作者： Uchenna e Okpete Haewon Byeon department of Digital Anti-aging Healthcare(BK21) Inje UniversityGimhae 50834South Korea

This article provides a comprehensive analysis of the study by Hou et al,focusing on the complex interplay between psychological and physical factors in the postoperative recovery(POR)of patients with perianal *** study sheds light on how illness perception,anxiety,and depression significantly influence recovery *** et al developed a pre.ictive model that demonstrated high accuracy in identifying patients at risk of poor *** article explores the critical role of pre-operative psychological assessment,highlighting the need for mental health support and personalized recovery plans in enhancing POR quality.A multidisciplinary approach,integrating mental health professionals with surgeons,anesthesiologists,and other specialists,is emphasized to ensure comprehensive care for *** study’s findings serve as a call to integrate psychological care into surgical practice to optimize outcomes for patients with perianal diseases.

关键词： Perianal disease Post-operative recovery Anxiety depression Pain management emotional well-being Multidisciplinary approach

A modified θ projection model for constant load creep *** of the model

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Journal of Materials Science & Technology 2019年第1期35卷 223-230页

作者： Chao Fu Yadong Chen Xiaofei Yuan Sammy tin Stoichko Antonov Koichi Yagi Qiang Feng Beijing Advanced Innovation Center for Material Genome engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing department of Mechanical Materials & Aerospace Engineering Illinois Institute of Technology National Center for Materials Service Safety University of Science and Technology Beijing

estimating long-term creep deformation and life of materials is an effective way to ensure the service safety and to reduce the cost of long-term integrity evaluation of high temperature structural *** the 1980 s, the θ projection model has been widely used for pre.icting creep lives due to its ability to capture the characteristic transitions observed in creep curves obtained under constant true stress conditions. However, the creep rupture behavior under constant load or engineering stress conditions cannot be simulated accurately using this model because of the different stress states. In this paper, creep curves obtained under constant load conditions were analyzed using a modified θ projection model by considering the increase in true stress with creep deformation during the creep tests. This model is expressed as ε = θ_1(1-e^(-θ_2t)) + θ3 e^(θ_4e^θ5^εt)-1, and was validated using the creep curves of K465 and DZ125 superalloys tested at a range of temperatures and engineering stresses. Moreover, it was shown that the pre.ictive capability of the modified θ projection model was significantly improved over the original one, as it reduces the pre.iction uncertainty from a range of 10% to 20% to below 5%. Meanwhile,it was shown that the model can be reasonably used for pre.icting constant stress creep conditions, when appropriate parameters are used. The pre.iction performance of the modified model will be discussed in another paper. The results of this study show great potential for the evaluation and assessment of the service safety of structural materials used in applications where designs are limited by creep deformation.

关键词： Superalloy Creep Life pre.iction Modified θ projection model Constant load creep