Research on application of ReliefF and improved RVM in water quality grade evaluation

ReliefF algorithm was used to analyze the weight of each water quality evaluation factor, and then based on the Relevance Vector Machine (RVM), Particle Swarm Optimization (PSO) was used to optimize the kernel width factor and hyperparameters of RVM to build a water quality evaluation model, and the experimental results of RVM, PSO-RVM, ReliefF-RVM and PSO-ReliefF-RVM were compared. The results show that ReliefF algorithm, combined with threshold value, selects 5 evaluation factors with significant weight from 8 evaluation factors, which reduces the amount of data used in the model, CSI index is used to calculate the separability of each evaluation factor combination. The results show that the overall separability of the combination is best when the evaluation factor with significant weight is reserved. When different water quality evaluation factors were included, the evaluation accuracy of PSO-ReliefF-RVM model reached 95.74%, 14.23% higher than that of RVM model, which verified the effectiveness of PSO algorithm and ReliefF algorithm, and had a higher guiding significance for the study of water quality grade evaluation. It has good practical application value.

Research on Application of Wireless Bridge Technology in the Smart Grid

The construction of smart grid, in the meet of communication network core layer must have the strong bearing capacity and the strong network frame, also requires the access layer have the wide variety and flexible edge access ability. In this article, in accordance with the technical features of the smart grid communication network, combined with the Global Energy Interconnection to the requirement of all kinds of communication. The wireless bridge system based on the IEEE 802.11 series protocol as flexible edge access is applied to the smart grid communications, to forward the power wireless bridge structure design and the bridge monitoring management platform design and safety protection design. The use of a wireless bridge will increase the transmission quality of signal, distance and the safety of the transmission. In this article, the wireless bridge in the application of the smart grid electric power communication network has a role in promoting, has a guiding significance to the construction of the smart grid communication.

Research on application of ecohydrology to disaster prevention and mitigation in China: a review

In this paper, the ecohydrology measures including water management and interaction of ecological hydrology were considered to take a holistic view on the impact of climate, ecology, environment, and topography on different types of disasters. In the first step, the contents of the grim disaster situation and the information framework of ecohydrology with disasters were evaluated. Nest, the creation of ecohydrology and its work with related disasters were summarized. Three disasters including flood, drought, and geohazard were evaluated and three examples (Dujiangyan Irrigation Project, Karez, and Ecological slope) have been separately discussed for considering the concept of the problem. Depending on the characteristics and potential for an effect in different disasters, there needed to be some challenges and opportunities for ecohydrology facing related disasters in various fields, such as National Space Planning, Sponge City and the ‘One Belt And One Road’ Initiative. Finally, some valuable conclusions were drawn on the application of ecohydrology to disaster prevention and mitigation. Furthermore, the key systemic settings between water management, hydrology, and ecology were described which is of the main importance for social disaster reduction, emergency management, and protection accident prevention.