作为计算机专业的核心课程,"网络"课程定位为:使学生系统掌握计算机工程设计知识,熟悉标准、规范,掌握计算机工程设计、课程与管理的基本技能, 通过实践教学环节培养学生的工程实践能力和良好素养.由于过去学校的硬件条件无法承担这一动手能力要求较高的课程需要,在以往的教学过程中,网络课程都是采用传统的"教师讲、学生听"的教学方式,虽然实践教学占总课时的一半以上,但是学生参与教学的积极性仍然不够,传统的教学方法和实验条件,无法给学生充足的工作过程现场感和参与感,影响了网络实践技能的掌握,最终导致学生就业时出现学过的知识短时间内用不上,要用的知识又没能学好的现象.

计算机JAVA程序设计应以工程过程和计算机软件技术为基础,学生必须实现重要的简历安美奇直达天下广告平台将采用"云搜索"和"微广告"技术为大家提供精确的搜索直达服务和专业的广告宣传策划方案.日本国际协力事业团目前的课程设计有助于根据工程课程的教学缺陷研究和实施教育改革.

笔者主要介绍通过云数据网络平台与嵌入式硬件设备数据共享的方式设计一款通用的安全防盗报警,该装置不仅可用于大多数交通工具(小车、自行车、摩托车等)的防盗追踪,也可适用于家庭安防,甚至也可以实现类似儿童手表的定位追踪功能.该装置主控MCU采用STM32F103c8t6芯片,以六轴陀螺仪传感器、GA6网络通信芯片和GPS定位等多种精密传感器为核心组成.该设备会及时地将采集的数据信息通过所创建的内网实时上传到所创建的云服务器,通过云短信和APP将安全信息及时反馈给使用者.

Through the classification of secondary cooling technology in continuous casting,the research of cooling technology from slab quality defects,solidification and heat transfer model,intelligent optimization control of the secondary cooling in continuous casting were reviewed.Analyzing the control concept and characteristics,summarizing the research achievements and application value,a continuous casting secondary cooling control model based on cloud manufacturing was established,and the development of continuous casting secondary cooling technology was discussed.

A mathematical model of transient heat transfer for 2D slab was established, and multi-objective function for optimization of secondary cooling of continuous casting was designed according to the metallurgical criteria and equipment constraint. From the view of the accuracy and convergence of the cluster, the improved artificial bee colony algorithm was introduced, then taking the minimum of the objective function as criterion, the optimization of water ratio during secondary cooling process was implemented. The experimental results show that the optimized water ratio during secondary cooling makes the slab surface temperature increase by 104℃, the degree of the slab defects and the total percentage of defective slab decrease.

In order to improve the internal quality of Q235B steel,the solidification heat transfer and dynamic soft reduction model were established,using the MSC Marc finite element software,the unit meshes and discrete solutions were carried out.The results show that the heat shrinkage of the casting nozzle reduce from 0.12 mm to 0.14 mm in turn,when the pull speed raise from 1.4 m/min to 1.6 m/min.The reduction zone increases with the increase of the casting speed,but the total reduction amount varies little.With the same fs,the reduction efficiency increases with the increase of the reduction amount.Through the practice of steel plant,the qualified rate of the top forging of slab is 98.41％,the qualified rate is 98.75％ after optimization of dynamic soft reduction,which effectively improves the quality of the cast slab.

数据结构是计算机学科各专业以及相关专业的一门核心专业基础课。针对该课程特点,结合教学实践,在教学模式、观念、方法,考试等方面进行改革,以提高学生学习兴趣,培养学生发现问题、分析问题、解决问题能力。实践表明,该教学思路对于培养学生的逻辑思维和数据抽象能力,尤其是算法分析和设计能力有较好的教学效果。

In order to solve the problem of high cost and low package transform efficiency in the environment of multiple subnets,a unsymmetrical VPN security mechanism based on IP security protocols under Linux structure was presented,which can provide integration,security,authentication and non-repudiation services at the network layer by using authenticaiton,access authority and the routing relay.Furthermore,it can decrease the system cost and increase the package transform efficiency.

In the VPN system based on IPSEC,NAT application has increased the complexity of network security,especially NAT has brought the conflict with IPSec.Aimed at the conflict between IPSec and NAT protocol,a new system solution with tunnel relay for compatibility of IPSec and NAT from a system precept was proposed,which solves the compatibility of IPSec and NAT.Finally,a design was realized.

This paper analyzed the complexity and security of IPSec protocols, then some reformative features were discussed, including the unity of transport mode and tunnel mode, the simplification of AH and ESP, the reformation of IKE and so on. So the protocol can be more practical and securer by modification.