Dynamic Visual Simulation Research Articles

RETRACTED ARTICLE: Dynamic visualization simulation of light motion capture in dance image recognition based on IoT wearable devices

RETRACTED ARTICLE: Dynamic visualization simulation of light motion capture in dance image recognition based on IoT wearable devices

Comprehensive Decision Index of Logging (CDIL) and Visual Simulation Based on Horizontal and Vertical Structure Parameters

The comprehensive indexes approach based on stand structure parameters is mainly used to select trees for harvest. However, these indexes do not consider the comprehensive impact of horizontal and vertical structures, leading to an incomplete analysis of the forest structure and an inaccurate selection of trees for harvest. To solve this problem, we constructed a comprehensive decision index of logging (CDIL), integrating horizontal and vertical structure parameters which can identify harvest trees more scientifically. In this study, we took the Shanxia Forest Farm in the Jiangxi Province of China as the experimental area and used mixed broadleaf/conifer forests at different ages as our experimental sample. We selected eight horizontal and vertical spatial structure parameters to establish an efficient, objective, and accurate comprehensive decision index of logging. We combined 3D visualization technology to realize the dynamic visualization simulation of the index at different intensities of tending and felling management. The results indicated that the proposed CDIL-index could effectively optimize the forest spatial structure. From the perspective of stand structure adjustment, the optimal thinning intensity was 20%. The average CDIL in each plot decreased by more than 80% after logging, while the change range of each plot was between 30% and 70% after the F index was applied to implement tending and logging. The CDIL was 11.4% more accurate in selecting trees for harvesting than the F index. In this study, the main conclusion is that the CDIL would enable forest managers to more accurately choose trees for harvesting, leading to forest adjustment that would reduce the competition pressure among trees and improve the distribution and health of trees, possibly making the forest structure more stable.

Research on Dynamic Visual Simulation of Hydropower Project Construction Based on Virtual Reality

In this paper, the basic theories and algorithms of virtual reality technology are studied, and the key technologies for drawing outdoor large-scale virtual scenes, realistic terrain simulation, virtual sound field simulation, and traffic layout in the construction site, three-dimensional road design, and dam construction simulation Visualization has been studied, and the system simulation information and graphics are closely combined to provide a new environment for the design and management of water conservancy and hydropower projects, and to provide decision-makers with a more scientific and intuitive basis.

Study on Dynamic Prediction and Visualization Simulation of Fire Temperature Field Based on UAVs

In the process of petrochemical fire rescue, temperature is an important reference index, which can be used to analyze the possibility of domino accident and tank collapse. A method for predicting temperature field by bicubic spline interpolation is proposed in this paper. It collects data from unmanned aerial vehicles (UAVs), and the accuracy of prediction is influenced by the sampling strategy. It's not that the more UAV routes are, the higher the overall prediction accuracy of temperature field will be. And the smaller the data interval, the more conservative the prediction results in the high- temperature zones.

Dynamic visual simulation of growth and management of Chinese Fir Based on Structured Forest Management

Based on the theory of Structure-based Forest Management, this paper studies the growth-management process of a forest considering the healthy state of the forest structure, and realizes three-dimensional visual simulation of this process based on unity3D. According to the angle scale, size ratio, crowding degree and other quantitative indexes of forest structure proposed by the theory of Structure-based Forest Management, the Spatial Structural function model and urgency management of forest were established to quantify the state of forest structure from many aspects. The growth equation of Chinese fir was fitted by the single tree growth equation based on the Hegyi competition index and forest density. Pre-thinning timbers are selected according to the rule that the cutting volume is less than the all growth volume in stand and size of competition index, and then the top 30%, 50% or 80% of pre-thinning timbers are extracted by rule sampling on the basis of pre-thinning timbers, and the stand structure function after thinning is alse calculated. The minimum value of thinning plan is taken as the actual thinning plan. Our results show that according to the growth period of 5 years, the growth and management of sample plot 5 were simulated for next 10 years. As in this case, based on the structured forest management, the dynamic visual simulation method of Chinese fir stand growth-management can realize the visual simulation of Chinese fir stand growth and management, which is a good way to show the forest growth management, and has a good demonstration role in improving the forestry informatization.

Dynamic 3D Simulation of Flood Risk Based on the Integration of Spatio-Temporal GIS and Hydrodynamic Models

Dynamic visual simulation of flood risk is crucial for scientific and intelligent emergency management of flood disasters, in which data quality, availability, visualization, and interoperability are important. Here, a seamless integration of a spatio-temporal Geographic Information System (GIS) with one-dimensional (1D) and two-dimensional (2D) hydrodynamic models is achieved for data flow, calculation processes, operation flow, and system functions. Oblique photography-based three-dimensional (3D) modeling technology is used to quickly build a 3D model of the study area (including the hydraulic engineering facilities). A multisource spatio-temporal data platform for dynamically simulating flood risk was built based on the digital earth platform. Using the spatio-temporal computation framework, a dynamic visual simulation and decision support system for flood risk management was developed for the Xiashan Reservoir. The integration method proposed here was verified using flood simulation calculations, dynamic visual simulations, and downstream river channel and dam-break flood simulations. The results show that the proposed methods greatly improve the efficiency of flood risk simulation and decision support. The methods and system put forward in this study can be applied to flood risk simulations and practical management.

Dynamic visual simulation of marine vector field based on LIC—a case study of surface wave field in typhoon condition

Line integral convolution (LIC) is a useful visualization technique for a vector field. However, the output image produced by LIC has many problems in a marine vector field. We focus on the visual quality improvement when LIC is applied in the ocean steady and unsteady flow field in the following aspects. When a white noise is used as the input in a steady flow field, interpolation is used to turn the discrete white noise into continuous white noise to solve the problem of discontinuity. The “cross” high-pass filtering is used to enhance the textures of streamlines to be more concentrated and continuity strengthened for each streamline. When a sparse noise is used as the input in a steady flow field, we change the directions of background sparse noise according to the directions of vector field to make the streamlines clearer and brighter. In addition, we provide a random initial phase for every streamline to avoid the pulsation effect during animation. The velocities of vector field are encoded in the speed of the same length streamlines so that the running speed of streamlines can express flow rate. Meanwhile, to solve the problem of obvious boundaries when stitching image, we change the streamline tracking constraints. When a white noise is used as an input in an unsteady flow field, double value scattering is used to enhance the contrast of streamlines; moreover, the “cross” high-pass filtering is also adopt instead of two-dimensional high-pass filtering. Finally, we apply the above methods to a case of the surface wave field in typhoon condition. Our experimental results show that applying the methods can generate high-quality wave images and animations. Therefore, it is helpful to understand and study waves in typhoon condition to avoid the potential harm of the waves to people’s lives and property.

3D Dynamic Visualization Simulation System of Pool Fire Triggered by Major Hazard Installation

3D Dynamic Visualization Simulation System of Pool Fire Triggered by Major Hazard Installation

Distribution Generation Cost-Benefit Model and Simulation Based on System Dynamics Take Photovoltaic Power Generation as an Example

Economic benefit analysis of distributed generation (DG) is helpful for the formulation and adjustment of the DG industry policy, and the dynamic visual simulation model couldimprove the accuracy in decision making. This paper first reviewed the domestic and foreign research status of distributed generation(DG） economic benefit, then analysed the direct benefits, indirect benefits and the costs of DG through the cost-benefit master model of DG set up by System Dynamics method. Meanwhile, each cost-benefit sub model is also provided. Finally simulation for 5 MW photovoltaic power station is carried out and its costs and benefits are presented. The validity of the model was verified for the results conforming to the anticipated target, the results also showed that subsidies had significant effects on the benefits of DG and the indirect benefits, especially carbon reduction benefit are obvious.

Three-Dimensional Dynamic Visual Simulation of Slope Instability of Barrier Landslide

The sliding movement of barrier landslide is a complex and dynamic process, because of the great effect of seismic action and huge surge. Adopting NURBS-TIN-BRep hybrid data structure and integrating with multi-source geological data, 3D geological model of the Tangjiashan quake dam was rebuild. The instability mechanism of the landslide was analyzed. Applying visualization technology, the whole formation process of the barrier dam, the production and development process of surge were fully and realistically displayed. These results above can help the engineering personnel to understand the whole condition of the Tangjiashan barrier dam. These research can provide some technical support for comprehensive governance scheme.

Analysis of Lower Limbs Dynamics and its Application in the Sports Training Based on Computer Vision

The lower limbs dynamics analysis model was researched, and applied it in the ports training based on computer vision. Through theoretical analysis and computer visual simulation, the detailed theoretical and simulation data was obtained for the lower limbs torque value, which was applied to sports training. Using the computer simulation technology, the human lower limbs skeletal dynamics model was established on the computer visual simulation platform. The joint torque values in different sports models were calculated for analyzing the optimum force and power mode. In the model building process, the single leg support motion model and running model were constructed, and the lower limbs dynamics analysis was implemented for the two models, calculating the joint torque values in theory and simulation. Finally, the ADAMS software was used for dynamic visual simulation in computer vision. Simulation results can show the force torque values vividly, the simulation result and theoretical result are compared and analyzed, it provides important data references and effective theoretical guidance in sports training, and it is meaningful for the optimization of physical training and improvement of training effect.

The Applicable Development of Steel-Construction Process Dynamic Visual Simulation Software

In this paper, steel-trussed bridging method is combined with the whole process of the construction-management project with an aim to develop a visual simulation software, whose database requires a three-dimensional model of dynamic visual simulation. This application can quickly realize the rapid construction of various types of data and retrieval data-management digitization. The software system achieves the management visualization of various types of integrated data, which are easy to use, intuitive to understand. The system is suitable for all types of steel works automation and some refinement of modern construction project management.

Study of Visual Simulation for Decomposition Assembly Tower by Derrick Supported by Inner Suspension and Inner Backstay

Derrick supported by inner suspension and inner backstay group tower is a construction technique commonly used in the construction of overhead transmission lines, the locale sketch and construction technique are complex, and not conducive to the analysis of the key construction and improve the level of decision-making. Through analysis assembly tower construction technology of derrick supported by inner suspension and inner backstay, using engineering visualization design software 3ds Max, the establishment of a three-dimensional model of the tower, the pole, tackle. According to the construction process for dynamic visual simulation, accurate image show the complexity of the construction process. Visual simulation provides an intuitive basis for the construction organization design and construction scheme optimization; enhance the level of construction management.

Simulation and Modeling of Emergency Dispatch Based on Multimode Transportation

Emergency dispatch is a dispatch problem, which is based on multimode transportation. To aim at the complexity of infection factors and difficulty of dispatch decision-making of emergency dispatch, this text adopts the way of combining analysis of mathematical modeling and OOA, by dint of IDEFO function model analysis, established object oriented, modularized and arrangement dynamic visualization simulation model of single assignment of emergency dispatch. By optimization of emergency dispatch, achieving scientific management and reasonable arrange of emergency supplies; by combination of multiple transportation, abbreviating emergency dispatch time, achieving maximal benefit, providing assistant decision-making of emergency supplies dispatch.

Study of Dynamic Visual Query Demonstration System for Steel Bridge Constructing Process

Based on Vb programming language, combined with the large span suspension bridge in the project construction management, research and development of a visual simulation of integrated system platform, achieve the data call and control on the dynamic 3D visual simulation model. Ready to deal with various types of data required for the project, and fundamentally changes the method of mass data management, to realize the “visualization”, “specification” and “simplification” of modern construction management, so that all results more intuitive display of data in the dialog window with visual modeling. It’s good call on a variety of data to guide construction.

Dynamic simulation and optimization approach to construction diversion of hydraulic and hydroelectric projects

To solve the engineering and scientific problems in construction diversion and its simulation analysis, a complete scheme is presented. Firstly, the complex constraint relationship was analyzed among main buildings, diversion buildings and flow control. Secondly, the time-space relationship model of construction diversion system and the general block diagram-oriented simulation model of diversion process were set up. Then, the corresponding numerical simulation method and 3D dynamic visual simulation method were put forward. Further, the simulation and optimization platform of construction diversion control process was developed, integrated with simulation modeling, computation and visualization. Finally, these methods were applied to a practical project successfully, showing that the modeling process is convenient, the computation and the visual analysis can be coupled effectively, and the results conform to practical state. They provide new theoretical principles and technical measures for analyzing the control problems encountered in construction diversion of hydraulic and hydroelectric engineering under complex conditions.

Research on 3D dynamic visualization simulation system of toxic gas diffusion based on virtual reality technology

A three-dimensional (3D) model of toxic gas diffusion was advanced based on Monte Carlo method with the presupposition that toxic gas diffusion process can be considered as random walk process of a large number of toxic gas particles. Compared to other existing models, this model includes analysis of both movement and non-movement attributes of toxic gas particles, and can well meet the need of dynamic simulation. Then, a 3D gas diffusion visualization scene management subsystem, including leak hazard source (tank), leak background (ground and sky) and surroundings near the leak area, was developed based on virtual reality (VR) technology. In this system, diffusion scene can be designed in accordance with the reality, which embodies the reunification between VR technology and engineering application. Finally, according to OpenGL particle system theory, by using Delphi and OpenGL as main programming tools, the diffusion simulation subsystem of toxic gas diffusion process and real-time concentration prediction and consequence simulation subsystem was completed. Application shows that by using VR technology in the accident consequence simulation, the whole system is of real-time, lifelike and visual characteristics, which not only embodies the great engineering value of virtual reality technology in the field of safety engineering, but also provides references for accident impact prediction, assessment and emergency plan.

Construction schedule simulation of a diversion tunnel based on the optimized ventilation time

Former studies, the methods for estimating the ventilation time are all empirical in construction schedule simulation. However, in many real cases of construction schedule, the many factors have impact on the ventilation time. Therefore, in this paper the 3D unsteady quasi-single phase models are proposed to optimize the ventilation time with different tunneling lengths. The effect of buoyancy is considered in the momentum equation of the CO transport model, while the effects of inter-phase drag, lift force, and virtual mass force are taken into account in the momentum source of the dust transport model. The prediction by the present model for airflow in a diversion tunnel is confirmed by the experimental values reported by Nakayama [Nakayama, In-situ measurement and simulation by CFD of methane gas distribution at a heading faces, Shigen-to-Sozai 114 (11) (1998) 769-775]. The construction ventilation of the diversion tunnel of XinTangfang power station in China is used as a case. The distributions of airflow, CO and dust in the diversion tunnel are analyzed. A theory method for GIS-based dynamic visual simulation for the construction processes of underground structure groups is presented that combines cyclic operation network simulation, system simulation, network plan optimization, and GIS-based construction processes' 3D visualization. Based on the ventilation time the construction schedule of the diversion tunnel is simulated by the above theory method.

Educational java applets in solid-state materials

WWW-based coursewares will benefit from libraries of subject-specific software objects that are embeddable in HTML documents. Development of libraries of Java applet programs in various subject areas is timely and important. The developed applet library should enable educators to include these applet programs in their HTML-based multimedia courseware. This paper discusses the development and utilization of Java applet programs in the area of solid state materials and devices. The applet programs developed so far, with the purpose of providing a dynamic visual simulation of solid-state material concepts and device principles, are included in the courseware section.