互联网络攻击的控制与防范

计算机网络的攻击技术越来越成熟，新一代的攻击目标直指互联网基础协议TCP／IP和操作系统层次，本文介绍了主动式Sniffer、内核rootkits、sniffer/Backdoors、DRDoS等新出现的网络攻击技术，分析了其原理和特性，着重介绍了与传统攻击手段的不同之处，提出了应对网络攻击、加强网络安全防范、健全网络安全体系的五项措施，为解决网络安全做出了有益的探索。     

EAST超导托卡马克等离子体位形平衡和反演算法

等离子体位形平衡和反演算法是EAST超导托卡马克控制系统的基础和重要组成部分。文中介绍了应用于托卡马克装置上的EFIT算法的物理含义;提出了EAST版EFIT算法开发移植的总体计划和主要流程结构,简要介绍了格林函数、平衡和反演核心子函数的构成;介绍了移植开发遇到的3类主要问题和解决方案。分析比较了算法产生的格林函数和等离子体特征参数的数据。     

Poloidal Field Control for the HT—7U Superconducting Tokamak

Controlling the poloidal field(PF) in the HT-7U superconducting tokamak is critical to the realization of the mission of advanced tokamak research.Plasma start-up,plasma position,shape,current control and plasma shape reconstruction have been performed as a part of its design process.The PF coils have been designed to produce a wide range of plasmas,Plasma start-up can be achieved for multiple conditions.Fast controlling coils for plasma position inside the vacuum vessel are sued for controloling the plasma vertical position on a short timescale.The PF coils control the plasma current and shape on a slower timescale,VXI(VME bus extensions for Instrumentation)Bus system and DSP(Digital Signal Processor is a basic unit of the feedback control system),the response time of which is about(2-4)ms.The basic unit of this system ,the shape-controlling algorithms of a few critical points on plasma boundary and real-time equilibrium fitting(RTEFIT)will be described in this paper.