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Discovery of transition rules for geographical cellular automata by using ant colony optimization

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Science China Earth Sciences 2007年第10期50卷 1578-1588页

作者： Anthony Gar-On yeh Center of Urban Planning and Environmental Management the University of Hong Kong Hong Kong SAR China

A new intelligent algorithm of geographical cellular automata (CA) based on ant colony optimization (ACO) is proposed in this paper. CA is capable of simulating the evolution of complex geographical phenomena, and the core of CA models is how to define transition rules. However, most of the transition rules are defined by mathematical equations, and are hence not explicit. When the study area is complicated, it is much more difficult to extract parameters for geographical CA. As a result, ACO is applied to geographical CA to automatically and intelligently obtain transition rules in this paper. the transition rules extracted by ACO are defined as logical expressions rather than implicit mathematical equations to describe the complex relationships of the nature, and easy for people to understand. the ACO-CA model was applied to simulating rural-urban land conversions in Guangzhou City, China, and appropriate simulation results were generated. Compared with See5.0 decision tree model, ACO-CA is more suitable to discovering transition rules for geographical CA.

关键词： ant colony optimization, CA, geographical simulation, artificial intelligence

Multi-agent systems for simulating spatial decision behaviors and land-use dynamics

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Science China Earth Sciences 2006年第11期49卷 1184-1194页

作者： Anthony Gar-On yeh Center of Urban Planning and Environmental Management The University of Hong Kong Hong Kong SAR China

A new method to simulate urban land-use dynamics is proposed based on multi-agent systems (MAS). the model consists of a series of environmental layers and multi-agent layers, which can interact with each other. It attempts to explore the interactions between different players or agents, such as residents, property developers, and governments, and between these players and the envi- ronment. these interactions can give rise to urban macro-spatial patterns. this model is used to simulate the land-use dynamics of the Haizhu district of Guangzhou City in 1995―2004. Cellular automata (CA) were also used for the simulation of land use changes as a comparison. the study indicates that MAS has better performance for simulating complex cities than CA.

关键词： multi-agent systems, cellular automata, complex systems, cities, land use.

Performance Analysis of Intelligent Robust Facility Layout Design

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Chinese Journal of Mechanical Engineering 2017年第2期30卷 407-418页

作者： G MOSLEMIPOUR t S LEE y t LOONG Department of Industrial Engineering Payame Noor University Faculty of Engineering and technology Multimedia University

Design of a robust production facility layout with minimum handling cost （MHC） presents an appropriate approach to tackle facility layout problems in a dynamic volatile environment, in which product demands randomly change in each planning period. the objective of the design is to find the robust facility layout with minimum total material handling cost over the entire multiperiod planning horizon. this paper proposes a new mathematical model for designing robust machine layout in the stochastic dynamic environment of manufacturing systems using quadratic assignment problem （QAP） formulation. In this investigation, product demands are assumed to be normally distributed random variables with known expected value, variance, and covariance that randomly change from period to period. the proposed model was verified and validated using randomly generated numerical data and benchmark examples. the effect of dependent product demands and varying interest rate on the total cost function of the proposed model has also been investigated. Sensitivity analysis on the proposed model has been performed. Dynamic programming and simulated annealing optimization algorithms were used in solving the modeled example problems.

关键词： Robust layout Dynamic stochastic environment Manufacturing system Dynamic programming

Lactate: an intracellular metabolite regulates cell cycle progression

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Life Metabolism 2023年第4期2卷 1-2页

作者： Jinke Cheng Edward t.H.yeh Department of Biochemistry and Molecular Cell Biology Shanghai Key Laboratory for Tumor Microenvironment and InflammationShanghai Jiao Tong University School of MedicineShanghai 200025China Department of Internal Medicine University of Arkansas for Medical SciencesLittle RockAR 72205United States

the Chouchani lab recently reported in Nature that a dynamic intracellular lactate is a physiological regulator for cell cycle *** also showed that accumulated lactate in cell mitosis directly binds and inhibits Sentrin/SUMO-specific pro-tease 1 to enrich SUMO2/3-modification of anaphase-promot-ing complex 4(APC4),which promotes the degradation of APC/C complexes,leading to mitosis exit.

关键词： cycle complexes accumulated

A concise review about fracture assessments of brittle solids with V-notches

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Frontiers of Structural and Civil Engineering 2019年第2期13卷 478-485页

作者： Hsien-yang yeh Bin yANG Department of Mechanical and Aerospace Engineering California State UniversityLong BeachCA 90801USA Department of Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

A concise review of recent studies about the fracture assessments of elastic brittle solid materials containing V-notches is presented. In this preliminary and brief survey, elastic stress distributions in V-notched solids are discussed first. the concept of notch stress intensity factor is introduced. Combine the digital image correlation method with numerical computation techniques to analyze the stress distribution near the notches. Fracture criteria such as strain energy density, J-integral, theory of critical distance are used. However, various new materials are developed in different engineering fields, thus, the establishment of reliable and accurate material strength theory or failure criterion is imperative. therefore, predicting fracture for various modem materials would require more experiments to infer material dependent parameters in the local fracture model.

关键词： fracture assessment brittle solids V-notches review

Simulations of H-Mode Plasmas in tokamak Using a Complete Core-Edge Modeling in the BALDUR Code

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Plasma Science and technology 2012年第9期14卷 778-788页

作者： y.PIANROJ t.ONJUN School of Manufacturing Systems and Mechanical Engineering Sirindhorn International Institute of TechnologyThammasat UniversityPathum Thani 12121Thailand

A theory-based model for predicting the pedestal formation in both ion and electron temperatures, and hydrogenic and impurity density is developed and implemented in the 1.5D BALDUR codes for self-consistently simulating H-mode plasma in tokamak. In the simulation, the transports around pedestal, including the electron and ion thermal, hydrogenie and impurity particle transports are calculated using an （Mixed B/gB） model, which is modified to anomalous semi-empirical mixed Bohm/gyro-Bohm include the effects of ωE×B flow shear and magnetic shear. Because of the reduction of transport, the pedestal can be formed. For a preliminary test, this core-edge model is used to simulate the temporal evolution of plasma current, temperature, and density profiles for DIII-D discharges. It is found that the simulations successfully reproduce the experimental results. A statistical analysis, including RMSE and offset, is used to quantify the agreement between the prediction and the corresponding experimental results. the simulation results show an agreement with average RMSE of 11.87%, 14.53%, 7.59% and 12.21% for electron temperature, ion temperature, electron density, and deuterium density profiles, respectively. In addition, it is found that the suppression function developed is effective only in the edge region.

关键词： ItER pedestal H-mode BALDUR fusion performance transport

transport mechanism in chemically reactive hybrid nanofluid flow containing gyrotactic micro-organisms over a curved oscillatory surface

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 177-192页

作者： M.NAVEED M.IMRAN t.ASGHAR Z.ABBAS Department of Mathematics Division of Science and TechnologyUniversity of Education Department of Mathematics The Islamia University of Bahawalpur

this paper examines the transport analysis, including both heat transfer and mass transfer, in hybrid nanofluid flow containing gyrotactic microorganisms towards a curved oscillatory surface. the influence of magnetic fields is also inspected in terms of their physical characteristics. to depict the phenomena of transport, modified versions of both Fick's and Fourier's laws are used. Additionally, the characteristics of both heterogeneous and homogeneous chemical reactions are also incorporated. Utilizing a curvilinear coordinate system, the flow problem is formulated as partial differential equations(PDEs)for momentum, concentration, microorganism field, and energy. An analytical solution to the obtained flow equations is achieved utilizing the homotopy analysis method(HAM).the effects of significant flow parameters on the pressure and microorganism fields, velocity, oscillation velocity, concentration, and temperature distributions are shown via graphs. Furthermore, the variations in skin friction, mass transfer rate, heat transfer rate, and local motile number due to different involved parameters are presented in tables and are analyzed in detail. Graphical results indicate that the curves of velocity and temperature fields are enhanced as the values of the solid volume fraction variables *** is also verified that the concentration rate field decreases as the values of the homogeneous reaction strength parameter and the radius of curvature parameter increase, and it increases with the Schmidt number and the heterogeneous reaction strength *** outcomes show a favorable response of the motile number to advanced values of the Peclet number, the Schmidt number, the microorganism difference parameter, and the bio-convective Lewis number.

关键词： Peclet number

DESIGN OF RECONFIGURABLE MANUFACtURING SyStEMS WItH StRONGLy COUPLED NAtURE

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Chinese Journal of Mechanical Engineering 2007年第1期20卷 91-95页

作者： LANG Sherman y t Integrated Manufacturing technologies Institute National Research Council Canada N6G 4X8 ON Canada

today＇s manufacturing cnvironmem forces manufacturing companies to make as many product variations as possible at affordable costs within a short time. Mass customisation is one of most important technologies for companies to achieve their objectives. Efforts to mass customisation should be made on two aspects：（1） to modularize products and make them as less differences as possible; （2） to design manufacturing resources and make them provide as many processes variations as possible. this paper reports our recent work on aspect （2）, i.e. how to design a reconfignrable manufacturing system （RMS） so that it can be competent to accomplish various processes optimally; Reconfignrable robot system （RRS） is taken as an example. RMS design involves architecture design and configuration design, and configuration design is further divided in design analysis and design synthesis. Axiomatic design theory （ADt） is applied to architecture design, the features and issues of RRS configuration design are discussed, automatic modelling method is developed for design analysis, and concurrent design methodology is presented for design synthesis.

关键词： Mass customisation Reconfignrable manufacturing systems Reconfignrable robotic system Analysis Synthesis Architecture Adaptability Reconfignrability Configuration design

Effect of thermal Refining on Mechanical Properties of Annealed SAE 4130 by Multilayer GtAW

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Journal of Iron and Steel Research International 2012年第7期19卷 71-78页

作者： I K Lee C L Chung y t Lee y t Chien Department of Materials Science and Engineering Da-Yeh University

During the first welding process in manufacturing a precise seam container, the steel material must first undergo a full annealing treatment. Multilayer welding operations are conducted and then applied with refining treatment to obtain the goal by hardening. the influence of thermal refining on mechanical properties of annealed SAE 4130 by multilayer GtAW （gas tungsten arc welding） was discussed. the AW （annealing＋welding） and AWSt （annealing＋welding＋solution＋tempering） occurred with a minimum hardness value at GGHAZ （grain growth heat affected zone） due to coarse grain growth~ the hardness occurred with sudden drops between the multilayer welding, but was still larger than the minimum value at HAZ （heat affected zone）. the welded joint efficiency of the AWSt was 89.9%, with the elongation reduced to 77.2% of ASt （annealing＋solution＋tempering）. the cross section of the tensile samples both appeared with a uniform dimple-shaped structure, and however the necking for ASt was greater than that for AWSt. the impact value for AWSt was 166.5% of ASt. Moreover, from microstructure observations, it was found that AWSt had a greater tendency to ductile failure than ASt. these results can be inferred., the process of steady pressure and the initial position of the precision tube breakage HAZ. However, when stress occurs instantly, HAZ can absorb more energy, therefore the initial damage does not occur.

关键词： thermal refining SAE 4130 multilayer welding GtAW