Wireless communications are evolving toward using higher frequencies , wider bandwidth and more functionality to satisfy growing demands of users worldwide . in recent years a concept of system - on - package ( sop ) is getting more attention in the rf area and is being applied to rf functional blocks and the front - end modules to achieve lower cost , improved performance , and increased design flexibility 随着个人通信技术的向更高频率、更宽带宽而用户发展的要求不断的提高,射频前端的设计越来说困难,近几年一个sop ( systemonpackage )的设计思想得到射频设计界的大量关注。 sop也就是说将无源元件和微波集成电路用现有的多层封装和连接技术组装在一个射频模块中。
By using theories from the relevant disciplines such as geography , mathematics , physics , ecology , and system sciences , this thesis develops a framework employing the concept of system entropy to represent the state function of the man - earth relationship system . in this framework the entropy change is used to show the development change of the system , and the entropy flow to express the flow among the spatial parts of the system . following the framework , and based on a large set of household data from surveys , the thesis makes a quantitative analysis of the village - level man - earth relationship system from a micro - perspective 借助地理学、数学、物理学、生态学、系统科学等有关学科理论,根据实地调查的大量农户数据,从微观视角对村域人地关系系统进行了定量分析,用人地关系系统熵来表征人地关系系统的状态函数,用熵变来反映人地关系系统的发展变化,用熵流来表示人地关系系统各空间型式地域主体之间的流动。
Topics include : the nature of risk , formal accident and human error models , causes of accidents , fundamental concepts of system safety engineering , system and software hazard analysis , designing for safety , fault tolerance , safety issues in the design of human - machine interaction , verification of safety , creating a safety culture , and management of safety - critical projects 其主题有:危险的性质,突发意外事件和人类错误模型,意外事件的因素,系统安全工程学的基本理论,系统和软件的危险分析,安全和容错设计,设计安全的人机交互,安全确认,创造安全文化和管理安全危急工程。
Constructing condition of tunnel engineering is very complicated , and the variable factor is much more , and the past experiencing safety management are not adapted to requirement of modern management , so the modern science management method - system safety engineering - come into being . this thesis dissertate it from the concept of system safety engineering , emphasized particularly on system safety analysis , system safety appraise and safety decision - making 隧洞工程的施工条件是非常复杂的,并且存在的不稳定因素比较多,安全隐患很大。传统的经验型安全管理已不能适应现代化管理的需要,所以产生了现代化的科学管理方法? ?安全系统工程。本文从介绍安全系统工程的概念入手,侧重论述了系统安全分析、系统安全评价和安全决策。