The students of arts thought more of " intimity " and " learning " than the students of science 情境模拟控制两个变量，即“信息公开与否”和“是否与己有关” 。
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Firstly , the surface characteristic of polystyrene particle is changed from water detesting to water intimity by using special techniques and admixtures so mat the compound quality with inorganic materials is insured . secondly , the contradiction between the weight and strength is solved through optimizing the particle size and using composite fiber and the best heat conductivity is achieved under the condition that the necessary strength is met . in the research process , the author solved the problem of fiber dispersing in insulating materials so that the contraction of the material is controlled 课题研究中，首先采用特殊的改性工艺及外加剂实现对聚苯乙烯颗粒表面的成功改性，使其表面由憎水转化为完全亲水，确保与无机材料的复合质量；其次，通过采用优化骨料级配及使用复合纤维等措施解决了保温材料的轻质与强度的矛盾，使保温材料在满足必要的强度的前提下，导热系数降至最小；并且，课题研究中成功解决了纤维在保温材料中均匀分散的问题，达到了抑制保温材料收缩的目的；最后，通过采用复合外加剂、合适的胶凝材料及合理的配比等措施确保该保温材料具有良好的和易性，满足施工的要求。
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The article points out the importance and necessity of the information - security from its actuality in our country . the resources in the information system , for instance , hardware , software , data , document , operator , meterial and so on , are evaluated and gived safety grade firstly . and then , it analyses the menace including the nonauthorized access , the information leak , the refused sevice , the internal objection which the system will take . the following are the corresponding control police : confirm the users " rights and duties , including the mode of using account , the limit of accessing resource , the application of password , the building of backup ; confirm the administrators " right and duties , including physical safety , system configuration , account configuration and usufruct , password management , audit and control , backup and individual intimity ; run - of - mill measure of security defence , including access control , symbol and identification , integrality control , password technique , firewall system , audit and resumption , safety of operating system , safety of database system , defence of computers " virus and resisting - deny protocol . in the end , the article offers the strategies of disposing the safety - accident and analyse after ithow . to report it , how to solve it in phase , and how to avoid it happening again . in a word , the article presents a holistic resolvent about keeping away the information system ' s security , and supplies a essential frame for its configuration , management and application 然后，对系统可能受到的威胁，包括非授权访问、信息泄漏、拒绝服务和内部缺陷等进行分析，并提出了相应的控制策略：确定用户的权力和责任，包括帐户使用方式、资源访问权限、口令应用以及建立备份等；确定系统管理员的权力和责任，包括物理安全、系统配置、帐户设置及使用权限、口令管理、审计和监控、备份以及个人隐私等方面；一般性的安全防护措施：存取控制、标识和认证、完整性控制、密码技术、防火墙系统、审计和恢复、操作系统安全、数据库系统安全、计算机病毒防护和抗抵赖协议等。最后，对事故处理和事后分析提供策略，如何报告安全事故，如何协调解决安全事故，如何避免安全事故再次发生。总之，本文对信息系统安全防范工作给出一个整体的解决方案，为其在配置、管理和应用方面提供了基本的框架。
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