Then,based on the difference in prediction mechanisms,the existing research on distance prediction is classified into three types:the virtual coordinate based prediction mechanism,the network topology based prediction mechanism and the network proximity estimation mechanism.

The logical coordinate and device coordinate system are introduced,as well as the relationship and the transform between them.

Design and implementation of virtual equipment and simulation system based on Java;

The research on virtual equipment and simulating system for microwave technique experiment is presented in this paper The necessity for virtual equipment and the simulating system is discussed The modeling of mathematics and basic means of achievement for virtual experiment are introduce

On virtual beer bottling production line is studied, on the large-scale virtual equipment and bottling production line is researched from the aspects of construction process and mold.

Approach for modeling virtual device library in VLAB;

Application and implementation of Linux virtual device in EPON system;

Meanwhile, introduce concept ofvirtual device logic to realize macro-decoupling of logic conceptand micro-decoupling of soft module, extensibility and stabilityof software are highly increased.

When virtual image coordinates are weighting,the experiment results show that the uniform model is feasible.

When the virtual image coordinates are given proper powers, the result states that the uniform model is feasible.