scholarly journals SIMULATION AND EXPRESSION OF ATMOSPHERIC POLLUTION DISPERSION PROCESS BASED ON 3D GRID

2020 ◽  
Vol V-4-2020 ◽  
pp. 239-245
Author(s):  
J. Shi ◽  
X. Tong ◽  
W. Yang ◽  
Y. Chang ◽  
Y. Zhong ◽  
...  
Keyword(s):  
Diffusion Process ◽  
Atmospheric Pollution ◽  
Data Model ◽  
Three Dimensional ◽  
Object Oriented ◽  
Simulation Experiments ◽  
Atmospheric Pollutant ◽  
Pollution Dispersion ◽  
Dispersion Process ◽  
Time Section

Abstract. Aiming at the problems existing on the expression of atmospheric pollution dispersion, a data model of state-oriented and object-oriented hybrid modeling is designed. The model supports true three-dimensional grid representation and cellular automata deduction, and can combine the calculation and deduction of atmospheric pollution to improve the accuracy and efficiency of the model. The simulation experiments of single source and multi-source pollutants are carried out. The results show that: the model conforms to the diffusion law of atmospheric pollution. The pollutant concentration at any time, section or space in the whole diffusion process can be calculated and expressed dynamically, which improves the accuracy, rapidity, intuitiveness and analysation of the deduction of atmospheric pollutant diffusion process.

Integrated 3D Spatial Data Model of Object-Oriented Digital Landslide

2012 ◽  
Vol 204-208 ◽  
pp. 4872-4877
Author(s):  
Da Xi Ma ◽  
Xiao Hong Liu ◽  
Li Wei Ma
Keyword(s):  
Spatial Data ◽  
Data Model ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Data Modeling ◽  
Object Oriented ◽  
Landslide Modeling ◽  
Space Data ◽  
Spatial Data Model ◽  
Three Dimensional Space

By analyzing the attributes of three-dimensional space data model, the integrated 3D spatial data adopts object-oriented method for digital landslide modeling. It achieves spatial data modeling for landslide geological entity. An experimental case is given to indicate the feasibility of this approach for spatial data modeling.

scholarly journals Development of dynamic three-dimensional coastal information system: a case study in Hong Kong

2012 ◽  
Vol 14 (3) ◽  
pp. 815-828 ◽  
Author(s):  
Bi Yu Chen ◽  
Jianzhong Lu ◽  
Onyx W. H. Wai ◽  
Xiaoling Chen
Keyword(s):  
Hong Kong ◽  
Data Model ◽  
Three Dimensional ◽  
Object Oriented ◽  
Information Management System ◽  
Data Types ◽  
Related Data ◽  
Abstract Data ◽  
Logical Data

Coastal-related data are four-dimensional in nature, varying not only in location and water depth but also in time. The heterogeneous and dynamic nature of coastal-related data makes modeling and visualization of these data a challenging task. A new object-oriented spatiotemporal data model to represent dynamic three-dimensional coastal data is proposed in this study. In the proposed model, a set of abstract data types allowing suitable spatiotemporal operations is defined to manipulate complex coastal data. In addition, a logical data model is proposed for the design of a spatiotemporal database. The proposed object-oriented and logical data models are implemented in a real-world coastal information management system in Hong Kong. An elegant visualization framework for displaying the coastal data, based on the concept of a time–depth bar, is presented in the case study.

ODM: An object oriented data model

1989 ◽  
Vol 7 (1) ◽  
pp. 3-35
Author(s):  
Mojtaba Mozaffari ◽  
Yuzuru Tanaka
Keyword(s):  
Data Model ◽  
Object Oriented

Study of the Spatio-Temporal Data Model in Sea Battlefield

2012 ◽  
Vol 246-247 ◽  
pp. 744-748
Author(s):  
Yue Lin Sun ◽  
Lei Bao ◽  
Yi Hang Peng
Keyword(s):  
Data Model ◽  
Object Oriented ◽  
Space Time ◽  
Comprehensive Analysis ◽  
Temporal Data ◽  
Data Types ◽  
Spatio Temporal ◽  
The Right ◽  
Effective Analysis

An effective analysis of the battlefield situation and spatio-temporal data model in a sea battlefield has great significance for the commander to perceive the battlefield situation and to make the right decisions. Based on the existing spatio-temporal data model, the present paper gives a comprehensive analysis of the characteristics of sea battlefield data, and chooses the object-oriented spatio-temporal data model to modify it; at the same time this paper introduces sea battlefield space-time algebra system to define various data types formally, which lays the foundation for the establishment of the sea battlefield spatio-temporal data model.

Data Base Requirements for Concurrent Design Systems

1991 ◽  
Author(s):  
Ranko Vujosevic ◽  
Andrew Kusiak
Keyword(s):  
Data Base ◽  
Data Model ◽  
Object Oriented ◽  
Concurrent Design ◽  
Complex Objects ◽  
Maintenance System ◽  
Design And Manufacturing ◽  
Design Systems ◽  
Truth Maintenance ◽  
Definition Of

Abstract The data base requirements for concurrent design systems are discussed. An object-oriented data base, which allows for definition of complex objects, specification of relationships between objects, and modular expandability without affecting the existing information is defined. The data base is developed based on the object-oriented data model implemented in Smalltalk-80. An assumption-based truth maintenance system for maintaining the dependency relationships between design and manufacturing information is described.

scholarly journals A global analysis of the atmospheric pollutant modeling

2007 ◽  
Vol 22 (1) ◽  
pp. 1-9
Author(s):  
Umberto Rizza ◽  
Jonas C. Carvalho ◽  
Davidson M. Moreira ◽  
Marcelo R. Moraes ◽  
Antônio G. Goulart
Keyword(s):  
Global Analysis ◽  
Turbulent Transport ◽  
Three Dimensional ◽  
Ground Level ◽  
Lagrangian Model ◽  
Linear Superposition ◽  
Atmospheric Pollutant ◽  
Advection Diffusion Equation ◽  
Laplace Transform Technique ◽  
The Laplace Transform

In this article is carried out a comparison between Lagrangian and Eulerian modelling of the turbulent transport of pollutants within the Planetary Boundary Layer (PBL). The Lagrangian model is based on a three-dimensional form of the Langevin equation for the random velocity. The Eulerian analytical model is based on a discretization of the PBL in N sub-layers; in each of the sub-layers the advection-diffusion equation is solved by the Laplace transform technique. In the Eulerian numerical model the advective terms are solved using the cubic spline method while a Crank-Nicholson scheme is used for the diffusive terms. The models use a turbulence parameterization that considers a spectrum model, which is given by a linear superposition of the buoyancy and mechanical effects. Observed ground-level concentrations measured in a dispersion field experiment are used to evaluate the simulations.

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