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Journal articles on the topic 'Model the dynamic dimension'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

HUET, SYLVIE, and GUILLAUME DEFFUANT. "OPENNESS LEADS TO OPINION STABILITY AND NARROWNESS TO VOLATILITY." Advances in Complex Systems 13, no. 03 (2010): 405–23. http://dx.doi.org/10.1142/s0219525910002633.

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We propose a new opinion dynamic model based on the experiments and results of Wood et al. (1996). We consider pairs of individuals discussing on two attitudinal dimensions, and we suppose that one dimension is important, the other secondary. The dynamics are mainly ruled by the level of agreement on the main dimension. If two individuals are close on the main dimension, then they attract each other on the main and on the secondary dimensions, whatever their disagreement on the secondary dimension. If they are far from each other on the main dimension, then too much proximity on the secondary

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2

Hall, E., S. Kessler, and S. Hanagud. "Use of Fractal Dimension in the Characterization of Chaotic Structural Dynamic Sytems." Applied Mechanics Reviews 44, no. 11S (1991): S107—S113. http://dx.doi.org/10.1115/1.3121342.

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The purpose of this paper is to investigate the use of fractal dimensions in the characterization of chaotic systems in structural dynamics. The investigation focuses on the example of a simply-supported, Euler-Bernoulli beam which when subjected to a transverse forcing function of a particular amplitude responds chaotically. Three different nonlinear models of the system are studied: a complex partial differential equation (PDE) model, a simplified PDE model, and a Galerkin approximation to the simpler PDE model. The responses of each model are examined through zero velocity Poincare´ section

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Ritmak, Nutthawut, Wanchai Rattanawong, and Varin Vongmanee. "The Dynamic Evaluation Model of Health Sustainability under MCDM Benchmarking Health Indicator Standards." International Journal of Environmental Research and Public Health 20, no. 1 (2022): 259. http://dx.doi.org/10.3390/ijerph20010259.

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The coronavirus pandemic causing millions of deaths around the world has raised awareness of the importance of healthcare in a city, especially its efficiency in the city’s system. Although the health dimension is found to have critical effects on sustainable development in addition to the existing three dimensions, the majority of sustainability assessments that are developed based on the UN’s Sustainable Development Goals (SDGs) do not define standards for each indicator. On the contrary, an effective assessment model should be dynamic and suitable to the context of each city by referring to

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Boersma, Sjoerd, Bart Doekemeijer, Mehdi Vali, Johan Meyers, and Wingerden Jan-Willem van. "A control-oriented dynamic wind farm model: WFSim." Wind Energy Science 3, no. 1 (2018): 75–95. https://doi.org/10.5281/zenodo.2556520.

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Wind turbines are often sited together in wind farms as it is economically advantageous. Controlling the flow within wind farms to reduce the fatigue loads, maximize energy production and provide ancillary services is a challenging control problem due to the underlying time-varying non-linear wake dynamics. In this paper, we present a control-oriented dynamical wind farm model called the WindFarmSimulator (WFSim) that can be used in closed-loop wind farm control algorithms. The three-dimensional Navier–Stokes equations were the starting point for deriving the control-oriented dynamic win

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Fischer, Lorenz Benedikt. "The bias of avoiding spatial dynamic panel models." REGION 8, no. 1 (2021): 153–80. http://dx.doi.org/10.18335/region.v8i1.316.

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Many questions in urban and regional economics can be characterized as including both a spatial and a time dimension. However, often one of these dimensions is neglected in empirical work. This paper highlights the danger of methodological inertia, investigating the effect of neglecting the spatial or the time dimension when in fact both are important. A tale of two research teams, one living in a purely dynamic and the other in a purely spatial world of thinking, sets the scene. Because the researcher teams' choices to omit a dimension change the assumed optimal estimation strategies, the iss

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Paluch, Alicja, and Henryk Spustek. "National Economic Power. Dynamic Model." Security Dimensions 38, no. 38 (2021): 22–36. http://dx.doi.org/10.5604/01.3001.0015.6516.

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The national power can be considered in a static and dynamic aspect as well. This applies to all dimensions of the national power, both military and non-military, including the economic one presented in this article. The national power, treated in a static sense as one of the leading features of the state and estimated over a given period, can only be descriptive. On the other hand, it gains a new dimension in a dynamic sense that consists in the possibility of developing the research into a prognostic area. Therefore, this approach to the issue of the national power has been presented here. T

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Boersma, Sjoerd, Bart Doekemeijer, Mehdi Vali, Johan Meyers, and Jan-Willem van Wingerden. "A control-oriented dynamic wind farm model: WFSim." Wind Energy Science 3, no. 1 (2018): 75–95. http://dx.doi.org/10.5194/wes-3-75-2018.

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Abstract. Wind turbines are often sited together in wind farms as it is economically advantageous. Controlling the flow within wind farms to reduce the fatigue loads, maximize energy production and provide ancillary services is a challenging control problem due to the underlying time-varying non-linear wake dynamics. In this paper, we present a control-oriented dynamical wind farm model called the WindFarmSimulator (WFSim) that can be used in closed-loop wind farm control algorithms. The three-dimensional Navier–Stokes equations were the starting point for deriving the control-oriented dynamic

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Luo, Yong Liang, Lin Zhang, Kui Ping Zhang, and Fei Tao. "Research on the Knowledge-Based Multi-Dimensional Information Model of Manufacturing Capability in CMfg." Advanced Materials Research 472-475 (February 2012): 2592–95. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.2592.

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Cloud manufacturing (CMfg) is a new service-oriented, highly efficient, lowly consumption knowledge based, and intelligent networked manufacturing model. It aims to achieve on-demand use, dynamic collaborative work, and circulation of manufacturing resources and manufacturing capability(MC). In order to achieve the above goal proposed, how to realize the formal description of MC is the key point in CMfg. This paper emphasizes the multi-dimensional information model of MC based on knowledge. According to the requirement and characteristics of manufacturing, the concept and connotation of MC wer

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Razaqpur, A. G., A. O. Abd El Halim, and Hosny A. Mohamed. "Bridge management by dynamic programming and neural networks." Canadian Journal of Civil Engineering 23, no. 5 (1996): 1064–69. http://dx.doi.org/10.1139/l96-913.

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Bridges and pavements represent the major investment in a highway network. In addition, they are in constant need of maintenance, rehabilitation, and replacement. One of the problems related to highway infrastructure is that the cost of maintaining a network of bridges with an acceptable level-of-service is more than the budgeted funds. For large bridge networks, traditional management practices have become inadequate for dealing with this serious problem. Bridge management systems are a relatively new approach developed to solve the latter problem, following the successful application of simi

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Narieswari, Lalitya, Santun R. P. Sitorus, Hartrisari Hardjomidjojo, and Eka Intan Kumala Putri. "Spatial Dynamic Model of Index-Based Disaster Resilience." Journal of Regional and City Planning 33, no. 3 (2023): 405–20. http://dx.doi.org/10.5614/jpwk.2022.33.3.7.

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Measurement and development of resilience are essential in disaster risk reduction programs. Furthermore, efforts are needed to measure resilience baselines to track changes over time and compare areas for monitoring and evaluating resilience development. Therefore, this study identified dimensions and indicators for measuring resilience using a statistical approach and developed an index-based spatial resilience model in a web-GIS environment. This paper presents the spatial distribution of urban resilience to disasters in Semarang City at the sub-district level. Factor analysis showed that 2

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Retnowati, Nurcahyani Dewi, Buyung Junaidin, and Engelbertus Rande. "GLIDER MODEL FLYING DYNAMICS SIMULATION EAGE-X ON LONGITUDINAL MATRA." Vortex 3, no. 1 (2022): 59. http://dx.doi.org/10.28989/vortex.v3i1.1165.

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The Glider Eagle-X aircraft is an unmanned aircraft which is expected to fly with a height of 7 meters above the ground in Yogyakarta (120 m above sea level) with a flying speed of 10 m/s. In order for the Eagle-X glider to fly stably, it is necessary to analyze the flight stability of the Eagle-X glider model. Therefore, in this study, the analysis phase of static stability and dynamic response of disturbances in the longitudinal dimension was carried out. This can be useful for students so that they can better understand the analysis of static stability and dynamic response of disturbances i

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Sha, Xiqing, Jing (Elaine) Chen, and Say Yen Teoh. "The dynamics of IT-business strategic alignment: evidence from healthcare information systems implementation." Information Technology & People 33, no. 5 (2020): 1465–88. http://dx.doi.org/10.1108/itp-08-2019-0414.

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PurposeThis study intends to reveal how to manage the dynamic process of information technology business (IT-business) strategic alignment; managing this alignment is an unknown yet critical issue that must be addressed by any firm trying to unleash the business value of their IT investments.Design/methodology/approachThis study presents our case study of a healthcare organization after healthcare information systems (HIS) implementation and investigates the strategic alignment between the implemented HIS and the organizational strategy from a dynamic perspective.FindingsTwo different patterns

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Yu, Jie, Songsheng Li, Xiaoyang Chen, Lei He, and Wei Yuan. "Dynamic Parameter Analysis of Spindle Bearing Using 3-Dimension Quasi-Dynamic Model." Mathematical Problems in Engineering 2019 (January 17, 2019): 1–15. http://dx.doi.org/10.1155/2019/7050151.

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Spindle bearing with high rotational speed is the kernel of many rotating machines which plays massive important role in the performance of the whole machine. There are also some deficiencies of the present quasi-dynamic mathematical models of the rolling bearing in analyzing the bearing dynamic parameters. This paper develops the 3D quasi-dynamic model with ball’s 6-DOF, cage’s 6-DOF, and driving ring’s 5-DOF under steady working stage, based on the analysis of the relative position of each component to determine the normal forces between each component and the analysis of the relative veloci

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Ragutkin, A. V. "Dynamic tasks in models of product operability." VESTNIK of Samara University. Aerospace and Mechanical Engineering 21, no. 3 (2022): 116–26. http://dx.doi.org/10.18287/2541-7533-2022-21-3-116-126.

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When developing models of critical mechanical engineering products, it is necessary to solve dynamic problems, taking into account changes in the dimension chains of links in the process of functioning of mechanisms. A method of calculating dynamic dimension chains as applied to solving direct and inverse problems is proposed. The solution of a direct problem is given under the condition that the stray field of the master link includes the errors of production and those related to the changes in the dimensions of the initial links under the action of operational loads. To obtain the value of t

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Lorenzo, Ferrer, and Caselles Antonio. "Contribution to the design of a world-model-globalisation-sustainability." Revista Internacional de Sistemas 18 (December 15, 2012): 1–10. https://doi.org/10.5281/zenodo.1137650.

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Globalisation is a phenomenon with paradoxes, contradictions and asymmetries that advances at different rhythms and velocities. Thus, globalisation is a system defined by the dynamic interrelation of its elements: economic dimension, political dimension, social dimension, cultural dimension, demographical dimension and ecological dimension. Independently of former considerations, between 1998 and 2004, a team of researchers at Universidad de Valencia developed a project about the Chaos Theory and its applications for the Biological and Social Complex Systems. This project was financed by the S

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Cai, Zhi-Jie, Xi-Qing Zheng, Hui-Qing Lan, Liu-Na Wang, Si-Wei Yang, and Rui Sheng. "Time-Varying Meshing Stiffness and Dynamic Parameter Model of Spiral Bevel Gears with Different Surface Roughness." Applied Sciences 14, no. 4 (2024): 1533. http://dx.doi.org/10.3390/app14041533.

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In order to explore the time-varying mesh stiffness and dynamic parameters of bevel gears with different surface roughness, the fractal dimension and characteristic scale coefficient are calculated to determine the fractal dimension of tooth surfaces of spiral bevel gears with rough features. Spiral bevel gears with distinct surface roughness are obtained by simulating the gear-cutting process, and after analysis, a dynamic differential equation for spiral bevel gears considering the surface roughness is proposed. By combining the differential equation with finite element analysis (FEA), the t

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17

Kumykov, Tembulat. "Charge accumulation in thunderstorm clouds: fractal dynamic model." E3S Web of Conferences 127 (2019): 01001. http://dx.doi.org/10.1051/e3sconf/201912701001.

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The paper considers a fractal dynamic charge accumulation model in thunderstorm clouds in view of the fractal dimension. Analytic solution to the model equation has been found. Using numerical calculations we have shown the relationship between the charge accumulation and the medium with the fractal structure. A comparative study of thunderstorm electrification mechanisms have been performed.

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18

Shen, Hao, Lan Luo, Xiaoxuan Niu, Chengqian Fu, and Yujie Han. "Dynamic Bayesian Network-Enabled Approach for Organizational Leadership Measurement of Complex Construction Projects." Buildings 14, no. 4 (2024): 1123. http://dx.doi.org/10.3390/buildings14041123.

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Complex construction projects are characterized by a large scale, high dynamics, many unknown risks, high complexity, etc., which often result in serious consequences, such as schedule delays, cost overruns, and uncontrolled objectives. Organizational leadership, which can be dynamically adjusted to the changes in the external environment, is the most important management ability of project managers. Therefore, it is of great significance to systematically analyze organizational leadership for the management of complex construction projects. In this paper, through the dynamic Bayesian method,

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19

Murtazina, R. D. "Study of the volt-ampere time series in the case of evaporation of aluminum wire electrolytes." Multiphase Systems 20, no. 1 (2025): 45–50. https://doi.org/10.21662/mfs2025.1.007.

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In the general sense, a dynamic system is a mathematical model of the evolution of a real system whose state at any given time is uniquely determined by its initial state. Often, when studying dynamic systems, the main source of information on the behavior of the object under study is a set of values of the observed quantity taken at certain (successive) points in time, the so-called time series. One of the main tasks in analyzing time series is to reconstruct the dynamic system that generated the series. For example, for a locally parameterized surface, Takens reconstructed the behavior of th

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20

Kurskoy, Yu S. "Measurement model for system with self-organization function." Bionics of Intelligence 2, no. 91 (2018): 94–98. https://doi.org/10.30837/bi.2018.2(91).14.

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The tasks of research and measurement of evolving nonlinear dynamical systems with a self-organization function is one of the most important scientific tasks. The paper presents a measurement model for such systems. The measurement model includes the measurements of dynamic variables of the system in the equilibrium and excited states. The results of the measurement are: the intervals of the dynamic variables values, the fractal dimension, the Shannon entropy and the dynamics prediction time. For assess of the evolutionary processes the model has the entropy and time scales. As a quantitative

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21

Shan, Li Jun, Wei Dong He, and Tian Min Guan. "Analysis of Nonlinear Characteristics of Double-Crank Ring-Plate-Typed Pin-Cycloid Gear Planetary Drive." Advanced Materials Research 44-46 (June 2008): 711–16. http://dx.doi.org/10.4028/www.scientific.net/amr.44-46.711.

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Double-crank ring-plate-typed pin-cycloid gear planetary drive conquers shortcomings of a traditional pin-cycloid gear planetary drive, whose load-capacity is restricted by rotation-arm bearing dimension. The load-capacity of this kind of new drive is improved greatly and the efficiency of whole machine is 94%. In order to know dynamics reliability of this drive , nonlinear characteristics of double-crank ring-plate-typed pin-cycloid gear planetary drive are analyzed from two sides of transmission error and dynamic meshing process in this paper. A sensitive analytic mathematic model of rod dim

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Tramontana, Fabio, Laura Gardini, Roberto Dieci, and Frank Westerhoff. "The Emergence ofBull and BearDynamics in a Nonlinear Model of Interacting Markets." Discrete Dynamics in Nature and Society 2009 (2009): 1–30. http://dx.doi.org/10.1155/2009/310471.

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We develop a three-dimensional nonlinear dynamic model in which the stock markets of two countries are linked through the foreign exchange market. Connections are due to the trading activity of heterogeneous speculators. Using analytical and numerical tools, we seek to explore how the coupling of the markets may affect the emergence ofbull and bearmarket dynamics. The dimension of the model can be reduced by restricting investors' trading activity, which enables the dynamic analysis to be performed stepwise, from low-dimensional cases up to the full three-dimensional model. In our paper we foc

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Broze, Laurence, Christian Gouriéroux, and Ariane Szafarz. "Solutions of multivariate Rational Expectations Models." Econometric Theory 11, no. 2 (1995): 229–57. http://dx.doi.org/10.1017/s0266466600009154.

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The aim of this paper is the study of the path solutions of a multivariate rational expectations model. We describe several procedures for solving such dynamic systems based on either the adjoint operator method or the Smith form. As a by-product, we derive the dimension of the set of solutions in terms of martingale differences and the dimension of the set of linear stationary solutions when we restrict ourselves to the linear case. These dimensions are functions of the number of equations in the system, of the maximum lead, and of the orders of some eigenvalues of the characteristic equation

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Zador, Anthony M., and Barak A. Pearlmutter. "VC Dimension of an Integrate-and-Fire Neuron Model." Neural Computation 8, no. 3 (1996): 611–24. http://dx.doi.org/10.1162/neco.1996.8.3.611.

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We compute the VC dimension of a leaky integrate-and-fire neuron model. The VC dimension quantifies the ability of a function class to partition an input pattern space, and can be considered a measure of computational capacity. In this case, the function class is the class of integrate-and-fire models generated by varying the integration time constant T and the threshold θ, the input space they partition is the space of continuous-time signals, and the binary partition is specified by whether or not the model reaches threshold at some specified time. We show that the VC dimension diverges only

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Lazzaroni, Giuliano, Riccardo Molinarolo, and Francesco Solombrino. "Radial solutions for a dynamic debonding model in dimension two." Nonlinear Analysis 219 (June 2022): 112822. http://dx.doi.org/10.1016/j.na.2022.112822.

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Rami Mahmoud, Mohamed. "High dimension dynamic programming model for water resources expansion projects." Engineering Optimization 38, no. 3 (2006): 371–89. http://dx.doi.org/10.1080/03052150600593218.

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Pena, D. "Dimension reduction in time series and the dynamic factor model." Biometrika 96, no. 2 (2009): 494–96. http://dx.doi.org/10.1093/biomet/asp009.

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Qian, Hong, Shuyin Sun, Xuehua Wang, and Zhenpeng Li. "Study of Condenser Spatial State Model Based on Dynamic Thresholding of Environmentally Adaptive Multi-Dimension Eigenvalues." E3S Web of Conferences 598 (2024): 02006. http://dx.doi.org/10.1051/e3sconf/202459802006.

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This study proposes an approach that takes into account the impact of marine environmental impacts on the multi-dimension eigenvalues and analyzes the condenser status based on multi-dimension eigenvalues dynamic threshold. Firstly, we get the multi-dimensional eigenvalues of the condenser Based on thermodynamic theory analysis. Then, utilizing seawater-temperature and seawater-level as environmental parameters, the partitioning of the condenser marine environmental region is optimized based on the CalinskiHarabasz index. Subsequently, the multi-dimension eigenvalues are used to calculate to g

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Zheng, Yue, Yanyu Zhao, Junjun Xu, and Ke Tang. "Affections of dynamic ductility and molecular friction for kinetic properties of bio-molecules in multidimensional landscape model." AIP Advances 12, no. 6 (2022): 065111. http://dx.doi.org/10.1063/5.0094358.

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Because of affections from fluctuation, the migration or reaction rate of bio-molecules is mainly related to the time-memory effect. This kinetic phenomenon is primarily dominated by dynamic ductility and molecular crowding in the solvent. These two important elements directly connect with the affections of the random force and systematic friction (ζ) in a real solvent. They can affect fluctuation characteristics of bio-molecules. Properties of bio-molecular kinetics are mainly submitted to the configuration quality and random collision. The multidimensional landscape must be needed in typical

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van Kekem, Dirk L., and Alef E. Sterk. "Symmetries in the Lorenz-96 Model." International Journal of Bifurcation and Chaos 29, no. 01 (2019): 1950008. http://dx.doi.org/10.1142/s0218127419500081.

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The Lorenz-96 model is widely used as a test model for various applications, such as data assimilation methods. This symmetric model has the forcing [Formula: see text] and the dimension [Formula: see text] as parameters and is [Formula: see text]-equivariant. In this paper, we unravel its dynamics for [Formula: see text] using equivariant bifurcation theory. Symmetry gives rise to invariant subspaces that play an important role in this model. We exploit them in order to generalize results from a low dimension to all multiples of that dimension. We discuss symmetry for periodic orbits as well.

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Tian, Xue Lian, and Yao Wu Wang. "An Interface-Based Integrated System for Project Risk Management." Advanced Materials Research 912-914 (April 2014): 1567–70. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.1567.

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According to the project interface risk classification including the physical interface risk, the contract interface risk, the tissue interface risk and the information interface risk, the integrated management model of project interface risk was put forward, which focused on the three dimensions: time dimension, relational dimension and information dimension. The project interface risk management system was developed, which consists of information subsystem, organizational subsystem, resources and support subsystem, and dynamic management subsystem. The system implements integration of projec

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Antonio, Acosta Mendizábal Marco, Dorantes Benavidez Humberto, Martínez Cruz Miguel Ángel, and Dorantes Benavidez Felipe de Jesús. "Percolation Analysis in a Fractal Network with Stable Opinion Dynamics." Ingénierie des systèmes d information 27, no. 5 (2022): 767–74. http://dx.doi.org/10.18280/isi.270509.

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This paper presents the proposal of a stable non-consensus opinion model in an infinitely branched fractal network, analyzing how its percolation properties are affected and based on the Ising model that allows the stable coexistence of three states, forming two groups of agents that hold contrary opinions and a third group that assumes a state of indecision The model is structured in a Sierpinski folder in which its fractal attributes are characterized by the dimensions of Hausdorff (DH), topological Hausdorff (DtH) and the spectral dimension (ds) since in these the values of the critical exp

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Mohiman, Mustafa Abdel, Abdullah Hussein Salem, and Yasser Nasr Eldin. "The Visionary Management Dimension: A Triadic Model for Strategic Leadership, Execution, and Scalability." Business and Management Studies 11, no. 1 (2025): 30. https://doi.org/10.11114/bms.v11i1.7743.

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Visionary Management Dimension as a foundation for the VFC Competence Framework, a model that connects Leadership, Management, and Business Scalability in a holistic framework for adaptive and scalable organizations. Informed by complexity theory, transformational leadership, and studies of scalability, the framework refutes the leadership-management dichotomy, positing these as dynamic, interdependent systems. By way of a conceptual synthesis rooted in empirical literature and real-world case studies from the oil and gas industry, the paper demonstrates how visionary foresight, operational pr

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Zhang, Ya Wei, and Wei Min Zhang. "Study on the Model Reduction Methods in CNC Machine." Advanced Materials Research 452-453 (January 2012): 1307–11. http://dx.doi.org/10.4028/www.scientific.net/amr.452-453.1307.

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In order to research dynamic characters of CNC machine tools, the finite element method is always adopted to model the system, and its dynamic characters are analyzed based on the modeling. The large dimension of the model for CNC machine and its key system become a problem to be solved. In this paper, the model reduce methods are compared and analyzed in order to clarify this problem. The transmission system of CNC machine tool is modeled by FEM firstly, then, the model reduction methods of reduce method, subspace method and Block Lanzcos method are applied for its modal analysis. The reduced

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Hsiao, Cheng, and Qiankun Zhou. "JIVE FOR PANEL DYNAMIC SIMULTANEOUS EQUATIONS MODELS." Econometric Theory 34, no. 6 (2017): 1325–69. http://dx.doi.org/10.1017/s0266466617000421.

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We consider the method of moments estimation of a structural equation in a panel dynamic simultaneous equations model under different sample size combinations of cross-sectional dimension, N, and time series dimension, T. Two types of linear transformation to remove the individual-specific effects from the model, first difference and forward orthogonal demeaning, are considered. We show that the Alvarez and Arellano (2003) type GMM estimator under both transformations is consistent only if ${T \over N} \to 0$ as $\left( {N,T} \right) \to \infty $. However, it is asymptotically biased if ${{{T^

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Grau, Jan, Pavel Souček, and Matěj Sulitka. "The Influence of Servo Drive Control on the NC Vertical Milling Machine Dynamic Compliance." Journal of Manufacturing and Materials Processing 4, no. 4 (2020): 111. http://dx.doi.org/10.3390/jmmp4040111.

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A model Numerical Control (NC) machine tool dynamic compliance is analyzed, including the influence of its mechanical structure and position control feed drive algorithms. The dynamic model of the machine tool is divided into two main parts, which are closest to the machining process. First, the milling head assembly group is presented as a system of one mass oscillating in a 2D plane and 3D space. Second, the motion axes assembly group, XY cross table with linear feed drive, is presented. A square 2×2 dimension matrix of the total dynamic compliance is evaluated within the feed drive control

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Zhu, Liyun, and Alfons Oude Lansink. "Dynamic sustainable productivity growth of Dutch dairy farming." PLOS ONE 17, no. 2 (2022): e0264410. http://dx.doi.org/10.1371/journal.pone.0264410.

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The economic, environmental and social sustainability of Dutch dairy farms have attracted increasing societal concern in the past decades. In this paper, we propose a recently developed dynamic Luenberger indicator based on the by-production model to measure dynamic productivity growth in the economic, environmental and social dimensions of sustainability of Dutch dairy farms. Subsequently, we investigate the statistical associations between productivity growth and socio-economic factors using the OLS bootstrap regression model. We find that dairy farms have suffered a decline in dynamic susta

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Yang, Haiqiang, and Zihan Li. "Dynamic Graph Convolutional Network-Based Prediction of the Urban Grid-Level Taxi Demand–Supply Imbalance Using GPS Trajectories." ISPRS International Journal of Geo-Information 13, no. 2 (2024): 34. http://dx.doi.org/10.3390/ijgi13020034.

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The objective imbalance between the taxi supply and demand exists in various areas of the city. Accurately predicting this imbalance helps taxi companies with dispatching, thereby increasing their profits and meeting the travel needs of residents. The application of Graph Convolutional Networks (GCNs) in traffic forecasting has inspired the development of a spatial–temporal model for grid-level prediction of the taxi demand–supply imbalance. However, spatial–temporal GCN prediction models conventionally capture only static inter-grid correlation features. This research aims to address the dyna

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Li, Dong Min, Yong Hai Tan, Rui Yin Xu, et al. "Design and Dynamic Simulation for Hydraulic Support." Applied Mechanics and Materials 456 (October 2013): 230–33. http://dx.doi.org/10.4028/www.scientific.net/amm.456.230.

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The whole structure of a new hydraulic support is designed according to the special working conditions, and the main parameters on its structure and dimension are calculated based on the whole structure and the corresponding formula about the structure design of hydraulic support. The entity of the new hydraulic support is modeled with Pro/E, and the whole assembling of hydraulic support is accomplished based on the former structure and dimension. Thus the dynamic simulation based on the entity model is done with Pro/E given the simulation data derived from the actual working status, and the s

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Shameli-Sendi, Alireza, Masoume Jabbarifar, Michel Dagenais, and Mehdi Shajari. "System Health Monitoring Using a Novel Method: Security Unified Process." Journal of Computer Networks and Communications 2012 (2012): 1–20. http://dx.doi.org/10.1155/2012/151205.

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Iterative and incremental mechanisms are not usually considered in existing approaches for information security management System (ISMS). In this paper, we propose SUP (security unified process) as a unified process to implement a successful and high-quality ISMS. A disciplined approach can be provided by SUP to assign tasks and responsibilities within an organization. The SUP architecture comprises static and dynamic dimensions; the static dimension, or disciplines, includes business modeling, assets, security policy, implementation, configuration and change management, and project management

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Wang, Wei, and Yuling Song. "A new high dimension nonlinear dynamics simulation model for four-wheel-steering vehicle." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 1 (2012): 29–37. http://dx.doi.org/10.1177/0954406212442045.

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A novel method and process that produce the multiple-degrees-of-freedom dynamic model of four-wheel-steering vehicle is proposed for dynamic prediction. It can avoid disadvantages of half-baked expression by simple linear dynamic model through thinking about nonlinear specialty of tire and applying two-dimensional LuGre tire friction model. The complexity caused by the unit of suspension which has absolute value elasticity and subsection linear damper is solved during modeling. Based on control law of turning angle, nonlinear dynamic characteristic of four-wheel-steering vehicle is calculated

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Jiang, Rong, Yang Xin, Huiping Cheng, and Wenxuan Wu. "T-RBAC Model Based on Two-Dimensional Dynamic Trust Evaluation under Medical Big Data." Wireless Communications and Mobile Computing 2021 (August 12, 2021): 1–17. http://dx.doi.org/10.1155/2021/9957214.

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The professionalism and complexity of medical big data and the expensiveness of acquiring medical knowledge make it difficult for policymakers to judge whether the information accessed by doctors is necessary from a professional perspective and to formulate accurate access control strategies. To solve the above problems, this paper proposes a T-RBAC (trust-role based access control) model based on two-dimensional dynamic trust assessment, Using AHP and Grey theory to quantify the role attribute trust in the dimension of the doctor’s own attributes, Using Euler’s measurement method and probabil

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Duan, Huiming, and Xinping Xiao. "A Multimode Dynamic Short-Term Traffic Flow Grey Prediction Model of High-Dimension Tensors." Complexity 2019 (June 3, 2019): 1–18. http://dx.doi.org/10.1155/2019/9162163.

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Short-term traffic flow prediction is an important theoretical basis for intelligent transportation systems, and traffic flow data contain abundant multimode features and exhibit characteristic spatiotemporal correlations and dynamics. To predict the traffic flow state, it is necessary to design a model that can adapt to changing traffic flow characteristics. Thus, a dynamic tensor rolling nonhomogeneous discrete grey model (DTRNDGM) is proposed. This model achieves rolling prediction by introducing a cycle truncation accumulated generating operation; furthermore, the proposed model is unbiase

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Xu, Zhicheng, Xiang Li, Wanyin Xiong, Qixiao Lin, and Jian Mao. "A dynamic multi-dimension trust model for information service quality evaluation." Procedia Computer Science 187 (2021): 601–6. http://dx.doi.org/10.1016/j.procs.2021.04.103.

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Xu, Chunyang, and Ping Dong. "A Dynamic Model for Coastal Mud Flocs with Distributed Fractal Dimension." Journal of Coastal Research 331 (January 2017): 218–25. http://dx.doi.org/10.2112/jcoastres-d-15-00110.1.

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Li, Xia, Hao Yan, and Yichi Zhang. "Optimization of Multisource Dynamic Model in TBO." Mathematical Problems in Engineering 2022 (February 4, 2022): 1–13. http://dx.doi.org/10.1155/2022/3755574.

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When extracting flight data from airport terminal area, there are matters such as large volume, unclear features, and similar trend in time series. In order to deal with the related issues and to optimize the description, by combining with the TBO (Trajectory-Based Operation), an application proposed by the ICAO (International Civil Aviation Organization) in ASBU (Aviation System Block Upgrade), using multisource dynamic model to establish 4DDW (4D dynamic warping) algorithm, the multisource modeling integrated with evaluation system is proposed to realize the flight path optimization with tim

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Fu, Yongling, Zeqi Wang, and Wanguo Li. "Fractal Dimension Fitting of Virtual Material and Experimental Verification." Journal of Physics: Conference Series 2338, no. 1 (2022): 012026. http://dx.doi.org/10.1088/1742-6596/2338/1/012026.

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Abstract Virtual material is a dynamic model of mechanical contact surface, which is suitable for finite element simulation. This method can characterize the stiffness and damping of the contact surface well by using fractal geometry theory to describe the contour of the contact surface. Based on standard W-M function, we verify the accuracy of the fractal dimension calculated by wavelet transform, and then fit the fractal dimension of machined surfaces with different roughness. Using the fractal dimension, we calculate the virtual material parameters to establish the finite element model of t

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Zhuang, Xiaodong, and Nikos Mastorakis. "The Dynamics of Deforming Manifold: A Mathematical Model." International Journal of Mathematical Models and Methods in Applied Sciences 16 (July 15, 2022): 146–54. http://dx.doi.org/10.46300/9101.2022.16.24.

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In order to meet the requirements of practical applications, a model of deforming manifold in the embedded space is proposed. The deforming vector and deforming field are presented to precisely describe the deforming process, which have clear physical meanings. The proposed model is a modification of the general differential dynamic model, with constraints of spatial and temporal continuity on the deforming field. The deformation integral and derivative are presented as compact expressions of manifold deforming process. Moreover, a specific autonomous deforming field with flattening effect is

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Tagade, Piyush M., and Han-Lim Choi. "A Dynamic BI–Orthogonal Field Equation Approach to Efficient Bayesian Inversion." International Journal of Applied Mathematics and Computer Science 27, no. 2 (2017): 229–43. http://dx.doi.org/10.1515/amcs-2017-0016.

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AbstractThis paper proposes a novel computationally efficient stochastic spectral projection based approach to Bayesian inversion of a computer simulator with high dimensional parametric and model structure uncertainty. The proposed method is based on the decomposition of the solution into its mean and a random field using a generic Karhunen-Loève expansion. The random field is represented as a convolution of separable Hilbert spaces in stochastic and spatial dimensions that are spectrally represented using respective orthogonal bases. In particular, the present paper investigates generalized

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Zhao, Jun, Juliang Jin, Xiaomin Zhang, and Yaqian Chen. "Dynamic risk assessment model for water quality on projection pursuit cluster." Hydrology Research 43, no. 6 (2012): 798–807. http://dx.doi.org/10.2166/nh.2012.095.

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With the aim of reducing the losses from water pollution, a dynamic risk assessment model for water quality is studied in this paper. This model is built on the projection pursuit cluster principle and risk indexes in the complex system, proceeding from the whole structure and its component parts. In this paper, the fuzzy analytic hierarchy process is used to screen out index system and determine index weight, while the further value of an index is simulated by hydrological model. The proposed model adopts the comprehensive dynamic evaluation method to analyze the time dimension data, and eval

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