2022-03-25

Epidemic prevention is not slack, scientific research does not stop, tsinghua SIGS research group teachers and students are making full use of online resources to do scientific research. At the same time, I am very grateful to the Graduate School for publicizing our research group. (See this link for details)

During the epidemic period, the research group adopted the mechanism of "one-two-three-four" and "two-place double drive" to carry out scientific research activities. Among them, "one" is to insist on a weekly group meeting, "two" is to ensure communication with the two students, and "three" is to solidify and promote the three-level guidance. The "fourth" is to actively strengthen the cooperation between the four sides. Under the impetus of this mechanism, the research group studied and scientific research in an orderly manner, and the students also actively reported on the recent work progress, and the results were good.

I believe that by the end of the epidemic, it will be a clear sky and a bright sun. My students and I will continue to make great strides...

2022-02-24

The 8th China Graphics Conference will be held in Tai'an, Shandong Province from July 22, 2022 to July 25, 2022.

With the theme of "Digital Empowerment and Mapping the Future", the conference will provide a platform for front-line workers engaged in graphics research, teaching and application across the country, as well as front-line researchers engaged in digital design, digital manufacturing, digital services and manufacturing informatization.

2022-02-13

《Fine Management System of Subway Construction Equipment and Materials Based on BIM Platform》 has been published in Construction Technology.

In order to solve the problems of long procurement and supply time limit, high price and slow response speed in Guangzhou subway project, a fine management system of subway construction equipment and materials based on Building Information Modeling (BIM) is developed in this paper. In the process of subway project construction, there are many kinds of materials due to the cooperative construction of civil engineering, mechanical and electrical engineering and other fields. The traditional manual input method is not only inefficient but also prone to error. Therefore, it is easy to cause the delay of construction period or the quantity of materials does not meet the production requirements. The project optimizes and analyzes the equipment and materials management process through the independently developed BIM-based management platform. The actual project verification shows that the process greatly reduces the waste of resources caused by human factors, largely avoids the repeated redundant steps in the traditional management process and shorts the project cycle. 

2022-02-09

"Method and Device for Simulation and Prediction of Water Pollution Diffusion based on Concentration Analysis" has obtained Certificate of Invention Patent. (Patent No. ZL202111240610.5).

This invention provides a method and device for simulation and prediction of water pollution diffusion based on concentration analysis. It can realize efficient diffusion simulation of various pollutants in water, especially in a large range of water (such as the ocean). In this method, the simulated area is divided into grids according to small squares, and a numerical value is used to record the pollutant concentration at the center of each grid. The corresponding values of all grids constitute a concentration matrix representing pollutant distribution, which is used to calculate the variation of pollutant concentration in each grid. Among them, the change process of pollutant concentration is divided into three independent sub-processes: migration process, dispersion process and attenuation process. According to analyzing and calculating the change of concentration matrix caused by each sub-process, the sub-process is superimposed to obtain the diffusion process of pollutants, the concentration matrix is updated. According to the time step the concentration matrix is iteratively calculated, and the pollutant concentration in the corresponding grid region is represented by the numerical value in the concentration matrix. Thus, it can realize the simulation and prediction of pollutant diffusion process.

Note : This patent is the inventor of Liu Yi, Guo Xueqing, Zhang Jianmin, Li sunwei, and myself.

2022-02-08

"Method and Device for Simulation and Prediction of Water Pollution Diffusion based on Particle Motion" has obtained Certificate of Invention Patent. (Patent No. ZL202111232257.6).

This invention provides a method and device for simulation and prediction of water pollution diffusion based on particle motion. It can realize efficient diffusion simulation of various pollutants in water, especially in a large range of water (such as oceans). Thus, it can solve the problems of analysis and prediction of pollutant diffusion process, concentration distribution and diffusion path. In this method, the pollutants in the simulated area are decomposed into a large number of pollutant particles, and the motion state change of each pollutant particle can be calculated. Among them, the motion state change process of pollutant particles is decomposed into three independent sub-processes: directional motion, random motion and random attenuation. Through the separate calculation and analysis of each sub-process, the whole diffusion process of pollutant particles is obtained by superimposing the sub-processes. The diffusion process of pollutant particles is iterated continuously, the pollutant particles in the sub-region of the simulation region are counted at the selected time point, and the pollutant concentration at the corresponding place is represented by the number of particles in each sub-region.

Note : This patent is the inventor of Liu Yi, Guo Xueqing, Zhang Jianmin, Li sunwei, and myself.