For the requirements of processing packets with time synchronization in the avionics system,the subject is proposed using VxWorks Embedded operating system to design and implement a network time protocol(NTP)server and establish a reliable process mechanism.This paper focuses on the NTP Protocol description,including its working principle,the network structure,work patterns and processes.Finally,performance of distributed systems is tested and analysis to clarify the establishment of a network time service system is detailed.NTP protocol is used for computer time synchronization in distributed systems,and network applications for distributed systems have importance value.

Relying on the lexical and syntactical research on translation process,this article uses the methods such as corpus,statistics and example analysis to build the acceptable word formations of specialized vocabulary in railway engineering and at the same time points out several problems existing in the specialized vocabulary translation and some solutions to them.What's more,through the engineering examples,it illustrates the effective ways to employ the strategies of amplification and omission so as to achieve accuracy,conciseness,and succinctness.This exploration aims to regulating the translation of railway engineering and improving the quality of scientific paper translation in this field.

Distributed Systems are more widely applied in embedded devices,especially in the areas of aviation and aerospace industry,or traffic controlling system.With the more network connection trend of the embedded system architecture, it needs more real-time and flexible communication capability but with loosecoupling interaction mechanism amongst sub-systems in the Distributed Embedded systems.In this paper,the author designs and constructs a developing platform for distributed-heterogeneous system based on the RTI API package.The platform provides application programmer with a higher level in design,and helps to implementing communicate among sub-systems by way of plug and play technique.The design could meet the system efficiency and real-time requirements quite well.

This paper analyzes the MP3 standard algorithm,realizes the MP3 encode and decode based on C51 microcontroller,and optimizes the MP3 encoding.Wireless function is added to the MP3 algorithm,and a campus self-help guider is designed.Field test result is very good.

Based on the draft of IEEE P802.3 D2.0, the core scheme of 40G/100G implementation technology was analyzed and researched, mainly in the research of distribution structure of MLD scheme, the research of the principle of MLD configuration and multi-lane alignment, and the analysis of application implementation of MLD.