Technologies based on computational fluid dynamics (CFD) have been developed to many new fields, such as generating scenes in computer games, computer animation and Hollywood movies. In this paper, the application of CFD to the computer simulation of tissue bleeding, which is one important part of developing a surgical training system based on virtual reality technology, is investigated. One real-time bleeding simulation model based on CFD is proposed aiming at realistic simulation of tissue bleeding. Navier-Stokes equations are applied to model blood flow as an incompressible fluid. A faster solution to the Navier-Stokes equations is employed to solve the density field and velocity field in order to develop a real-time system. In light of this solution, a tissue bleeding model with OpenGL has been implemented. The results show that this method applied to the bleeding simulation is elucidating and practical.

Aiming at the application scene with both burst signals and periodic signals, this paper proposes a cluster-based wireless sensor network MAC protocol combining TDMA, FDMA with CSMA/CA - CBPMAC/TFC(a cluster-based wireless sensor network MAC protocol for the system with burst and periodic signals/based on TDMA, FDMA, CSMA/CA). It adopts TDMA mechanism in the clusters, and assigns time-slots for periodic signals and burst signals respectively. In the periodic signal time- slot, only one child node sends its periodic signal, while in the burst signal time-slots, all the child nodes share the channel according to CSMA/CA mechanism. Among different clusters, FDMA mechanism is adopted. Different cluster works at different frequency channel, so they can work simultaneously. For the requirement of synchronization, a cluster-head-based relative time synchronization mechanism is proposed. In addition, the alternation strategy of cluster heads and the disposal strategy of malfunctions are introduced. Analysis and test results show that the protocol could meet the system requirements in reliability, real-time response and energy efficiency.

According to the characteristic of high reliable and low power periodical data collection on a large scale metallurgical industry wireless sensor network(WSN), we present a hybrid TDMA-FDMA MAC protocol this protocol depends on a cluster-based hierarchical topology and uses a synchronization mechanism with dynamic time-stamp adjusting. In this protocol, we use a one-off time-slot allocation TDMA based on broadcasting in initial and adopt dynamic timestamp adjusting time synchronization technology for each node within a cluster, which could effectively decrease the data collision caused by random competition and reduce the synchronization cost in traditional TDMA protocol. And we adopt FDMA protocol between the clusters to order to deploy a large-scale WSN with little delay increase. The experiment result has proved that this protocol could prolong the networks life-time by about 14% compared with the traditional TDMA protocol, and it also demonstrates that the protocol could guarantee the requirement of energy efficiency, accuracy, robust and reliability in metallurgical industry. The protocol could also be applied to other WSN systems.

Human beings are the most precious treasure in the world. Human-orientation is not only necessary to the all-round building of a prosperous society, but also essential to our ideological and political education. In the wholly new era of building a prosperous society, in order to stick to human-orientation, not only should ideological and political education regard human as the practical body, and activate their enthusiasm, subjectivity and creativity, but also take them as the value body, pay attention to their daily life and practical interests, satisfy their material needs, spiritual needs and valuable needs. Only through this can we realize the value of ideological and political education at the best.