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一种新的Capability实现机制
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作者 李毅 周明天 虞厥邦 《计算机科学》 CSCD 北大核心 2001年第4期91-94,共4页
1 引言 信息安全,除CPU、编译器和网络安全外,最重要的组成部分就是操作系统的安全核心.POSIX.1e[1]和POSIX.2c[2]分别定义了操作系统安全核心中可选的(alternative)和附加的(additional)安全机制Capability(命令与系统功能调用控制),MA... 1 引言 信息安全,除CPU、编译器和网络安全外,最重要的组成部分就是操作系统的安全核心.POSIX.1e[1]和POSIX.2c[2]分别定义了操作系统安全核心中可选的(alternative)和附加的(additional)安全机制Capability(命令与系统功能调用控制),MAC (Mandatory Access Control,强制访问控制),Audi (Security Auditing,安全审计),ACL(Access Control Lists,访问控制表),IL(Information Labeling,信息标签)的C接口和shell命令接口.但是对各种安全机制的精确语义和完全实现机制未做出定义.此外,文[1,2]还允许对各种安全机制所包含的内容进行扩充. 展开更多
关键词 操作系统 capbility 进程 权限控制
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Effectiveness of Computer Assisted Problem based Learning in Chemistry for Enhancing Thinking Skills among Secondary School Students
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作者 Rajeswari K 《Journal of Chemistry and Chemical Engineering》 2015年第3期233-237,共5页
Experiencing problems that challenges science and the thought, habits of mind and actions associated with trying to solve them is one of the best ways of learning Chemistry. This impels opportunities for authentic, in... Experiencing problems that challenges science and the thought, habits of mind and actions associated with trying to solve them is one of the best ways of learning Chemistry. This impels opportunities for authentic, inquiry based learning. PBL (problem based learning) is a student centered pedagogy in which students learn about a subject through the experience of problem solving. The goals of PBL are to help the students develop flexible knowledge, effective problem solving skills, self-directed learning, effective collaborative skills and intrinsic motivation. CAPBL (computer assisted problem based learning) has been created to expand the boundaries of the creativity and the creativity of students beyond the four walls of the classroom. In the present study the investigator tested the effectiveness of the CAPBL material in Chemistry for enhancing thinking skills among secondary school students. The sample consisted of 100 secondary school students. The study revealed that the CAPBL material in Chemistry is effective in enhancing thinking skills such as critical thinking, creativity and problem solving. 展开更多
关键词 CAPBL thinking skills CREATIVITY problem solving skills.
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