上濟充通大学 Research Status of Human-Computer Interaction 6.1.3 Enhancement Virtual Reality It has to be admitted that the software and the hardware play vital roles in the virtual reality system. Besides these two key points,a third important role is played by the real environment.The third system,named Enhancement Virtual Reality',blends the virtual world with the real surroundings. Users can simultaneously catch sight of the real world and some virtual objects projected into the real world(Chen et al.,2011).The mixture strengthens the effect of human-computer interaction. Fig.10 A cartoon character made by Enhancement Virtual Reality 6.1.4 Distributed Virtual Reality A wide range of users in different places communicate with each other in the same virtual space and they see the same scenery in the virtual reality system.This is the fourthsystem,Distributed Virtual Reality'.War Simulation Network is typical of this kind of system.Soldiers use this network to take part in joint combat trainings so that their combat capability is enormously improved and their combat experience becomes richer(Chen,Zhao,Liang,2002). Fig.11 Distributed Virtual Reality used in military training 6.2 Virtual Reality Hardware The virtual reality hardware is the base of the virtual reality system and it is the increasingly high computation and transmission speed of quite advanced hardware that make it possible that more and more real feelings are brought to users.What's more,with the hardware's cost performance becoming rapidly higher,the virtual reality technology gradually goes out of the laboratory and has been developed sowell that it has been applicable and benefic ial to all kinds of non-computer fields. 6.2.1 Helmet Mounted Display Up to now,it is fortunate that some virtual reality facilities have been very mature and the simple introduction to them is indispensable.The first device to present is the Helmet Mounted Display which is a rather economical and practical facility and it is used widely not only in the army,but 13119Research Status of Human-Computer Interaction 13 / 19 6.1.3 Enhancement Virtual Reality It has to be admitted that the software and the hardware play vital roles in the virtual reality system. Besides these two key points, a third important role is played by the real environment. The third system, named ‘Enhancement Virtual Reality’, blends the virtual world with the real surroundings. Users can simultaneously catch sight of the real world and some virtual objects projected into the real world (Chen et al., 2011). The mixture strengthens the effect of human-computer interaction. Fig. 10 A cartoon character made by Enhancement Virtual Reality 6.1.4 Distributed Virtual Reality A wide range of users in different places communicate with each other in the same virtual space and they see the same scenery in the virtual reality system. This is the fourth system, ‘Distributed Virtual Reality’. War Simulation Network is typical of this kind of system. Soldiers use this network to take part in joint combat trainings so that their combat capability is enormously improved and their combat experience becomes richer (Chen, Zhao, & Liang, 2002). Fig. 11 Distributed Virtual Reality used in military training 6.2 Virtual Reality Hardware The virtual reality hardware is the base of the virtual reality system and it is the increasingly high computation and transmission speed of quite advanced hardware that make it possible that more and more real feelings are brought to users. What’s more, with the hardware’s cost performance becoming rapidly higher, the virtual reality technology gradually goes out of the laboratory and has been developed so well that it has been applicable and beneficial to all kinds of non-computer fields. 6.2.1 Helmet Mounted Display Up to now, it is fortunate that some virtual reality facilities have been very mature and the simple introduction to them is indispensable. The first device to present is the Helmet Mounted Display which is a rather economical and practical facility and it is used widely not only in the army, but