To use Java language and take JAIN SIP as the core, all kinds of communication entity basic method in the fulfillment of SIP communication were described and simple model for SIP communication was built.

Based on the idea that test suite design and test transport be independent, the technique that combines communication entity with network interface is proposed to implement transport mechanism.

Under the background of logistics reform which is put forward by universities, the need of this essay is to study the development management pattern of logistics communication entity.

This paper introduces the components and features of DICOM as well as application entity, service and message communication.

In the studying field of style,concerning the choice of object and range,there obviously is a kind of partiality that giving priority to the literary style but looking down on the practical style.

The present paper,based on a survey of the research on translation conducted by scholars in the field of translation in China,proposes that it is necessary to emphasize the characteristic of practical style text, practicality ,when we carry out the translation practice of such kind of texts, for the literariness and elegance could be seldom found in the text.