Guaranteed-cost reliable control with regional pole placement of a power system

This paper deals with the simultaneous coordinated design of power system stabilizer (PSS) and the flexible ac transmission systems (FACTS) controller. The problem of guaranteed cost reliable control with regional pole constraint against actuator failures is investigated. The state feedback controllers are designed to guarantee the closed loop system satisfying the desired pole region, thus achieving satisfactory oscillation damping and settling time, and having the guaranteed cost performance simultaneously. The proposed controllers satisfy desired dynamic characteristics even in faults cases. The controller's parameters are obtained using the linear matrix inequalities (LMI) optimization. Simulation results validate the effectiveness of this approach.     

英汉礼貌现象的语用对比研究

后奥运时代的中国必将迎来更多的外国游客,在交际过程中如何才能做到有礼貌,对一向以礼仪之邦闻名的中华民族提出了一个不大不小的挑战。中西方世界对礼貌现象的不同解读,造就了英汉两种语言在礼貌表达方式上的差别,从而使得交际过程中频繁出现语用失误,甚至影响到交际过程的顺利进行。文章通过对英汉两种文化中的礼貌现象和礼貌用语进行细致的对比研究,试图揭示其深层次的原因,以期为交际活动的顺畅进行提供指导。     

社交语用失误的人际功能语法视角分析

借用韩礼德所提出的关于语言的＂人际功能语法＂概念这一独特研究视角,对种种社交语用失误现象进行分析研究,指出社交语用失误的出现是由于语言使用者未能恰切地或者说最优地发挥韩礼德所提出的关于语言的＂人际功能语法＂功用的结果,强调了在外语教学中对学习者语用能力培养的重要性。并通过对在校大学生所犯语用失误的量化分析,结合外语教学自身特点尝试性地从三个方面给出了如何在外语教学中培养语言学习者的语用能力的建议,以求能够获得更好的教学效果。     

Intercultural Pragmatic Failures and Bilingual Teaching

In bilingual teaching,the author of this paper found some problems appearing in Sino-English speaking communication,espe cially the problems of intercultural pragmatic failures.In this paper,the author puts forward some proposals to avoid them by focusing on the intercultural pragmatic failures in both English communication and English teaching.     

跨文化交际中语音层面的语用失误探析

跨文化交际语用失误发生在语言的各个层面。语音层面的语用失误,是由于汉英两种语言在音节结构、重音和语调、节奏和押韵等方面存在较大的差异性所导致的发生在跨文化交际中的失误。     

跨文化交际障碍的主要原因；语用失误

语用失误可分为语用一语言失误,社交一语用失误和语用一行为失误,造成语用失误的原因主要有三个：语用的错误迁移、不同的价值惊讶和不当的教学方法,当今外语教学应在注意语言知识传授的同时,注重增强学生的文化意识,培养学生的语用能力,以达到预期的目的。     

The evolution of mission-oriented policies: Exploring changing market creating policies in the US and European space sector

Market creation is moving to the centre of mission-oriented innovation policy. This is particularly visible in the space sector. Agencies such as the National Aeronautics and Space Administration (NASA) and the European Space Agency (ESA) are developing market-creating innovation policies in response to (a) the increasing emphasis on societal grand challenges, (b) the rise of a new wave of space companies (often referred to as “New Space”) and (c) the global trend towards interconnecting and interlinking of industries (a trend referred to as Industry 4.0). In this paper we explore the changing nature of mission-oriented innovation policies for market creation for two agencies, NASA and ESA. For these agencies, earlier mission-oriented policies focused on clear challenges with identifiable concrete problems and directed by a strong centralized agency. Contrast this with today, with broadly defined grand challenges, decentralized innovation systems with mixed top-down and bottom-up problem definition. We describe the current drivers and pressures that are creating a window for policy change, and we present examples of how NASA and ESA are responding to these pressures and use this exploration to dig deeper into the evolving frames of market-creating innovation policy in the space sector to identify the challenges for such policies and to further articulate a research agenda.     

论信息市场失灵与政府干预

从信息市场的外部效应、信息作为公共物品、信息市场的非竞争性和垄断性以及不完备信息 4个方面对信息市场失灵作了分析。政府干预在纠正信息市场失灵方面能发挥独特的作用。表 1。参考文献 18。     

Cascading failures in local-world evolving networks

The local-world （LW） evolving network model shows a transition for the degree distribution between the exponential and power-law distributions, depending on the LW size. Cascading failures under intentional attacks in LW network models with different LW sizes were investigated using the cascading failures load model. We found that the LW size has a significant impact on the network＇s robustness against deliberate attacks. It is much easier to trigger cascading failures in LW evolving networks with a larger LW size. Therefore, to avoid cascading failures in real networks with local preferential attachment such as the Internet, the World Trade Web and the multi-agent system, the LW size should be as small as possible.     

浅析无盘系统启动故障处理

近年来随着千兆网络的发展,无盘工作站的应用呈几何倍数增长,其原理就是在网内建立一个系统服务器,将工作站要用到的操作系统文件和软件文件都放在服务器上,使系统的管理和维护都在服务器上完成。升级服务器的软件相当于同时升级所有的工作站,而且不怕恶意攻击、随意关机和人为破坏,具有节省资金、易于管理、速度快、安全性好的特点。处理各种无盘工作站的故障成为考验一个网络管理员能力的重要方面。