基于分布式系统的隔离网闸体系结构研究     

杨熠  谭成翔  汪海航 《中国科技信息》2007,(5):282-284

很多涉密网络必须和外网实现物理隔离,但是实际中很多应用程序又需要在这种情况下仍然能正常工作。因此研究如何在保证物理隔离的同时,提供高带宽,低延时的数据传输效率,是一个很有意义的研究内容。本文在国家信息安全标准下,基于GAP思想建立了一套基于分布式系统的隔离网闸方案。  相似文献   

Towards a process theory of learning: Feeling the beauty of the world     

Howard Woodhouse 《Interchange》1995,26(4):347-364

Alfred North Whitehead's theory of learning is best understood in the overall context of his process philosophy. The rhythmic cycles of growth forming the basis of human learning (romance, precision, and generalisation) are organically connected to the characteristics of life typifying all entities in the universe (self-enjoyment, creative activity, and aim).The kind of balanced education which best enhances growth and connectedness is one in which art and aesthetic appreciation in the broadest sense are dominant. By experiencing the beauty of the sunset, for example, children and adults have access to feelings that flow through them from the world and connect them to distant events taking place in space and time. These bodily feelings at the base of all experience provide concrete ways in which human beings can appreciate the intrinsic value of the world around them.By way of contrast, the methods of 17th century science replace our concrete experience of the sunset with abstract categories that are used to measure the phenomena in question and deny the importance of that experience in understanding the world. Schools' and universities' emphasis upon this methodology produces an imbalanced education with minds in a groove.A renewal of balance in education helps us to understand the false dichotomy between child-centered and and curriculum-centered education. Education for Whitehead must pay attention to both. Moreover, he understands that the academic freedom enjoyed by bands of imaginative scholars in universities is not an article of commerce to be sold to the highest corporate bidder but something to be valued for its intrinsic worth.  相似文献   

电视剧艺术生产主体：在“孤立”到“集体”的路上     

熊文泉  高晓军 《江西教育学院学报》2011,32(4):146-149

为了创作出独刨性艺术作品,艺术家必须获得超越视角以洞察世界,久而久之。渐渐形成某种“孤立”的境界。中国电视剧艺术生产主体是由制片人、编剧、导演、演员等艺术家按照一定形式结构的集体。如此,电视剧艺术家被抛掷在一条“孤立”到“集体”的路上。在不同的体制和机制下,曾形成“编剧中心制”、“导演中心制”、“制片人中心制”、“明星中心制”等等组织形式,无论以谁为中心,其实质无非要确立一个“孤立”的中心。其实,艺术生产的“孤立”与“集体”并不矛盾,在“孤立”到“集体”的路上,个体应既是“孤立”的,又是“集体”的,“孤立”中有“碰撞”,“碰撞”后再“孤立”。形成一种多元结构的“集体主体性”。  相似文献   

SIS系统安全防护设计与实现     

于治国 《山东教育学院学报》2011,26(3):43-48

本文阐述了SIS系统安全系统区域的划分,根据电力系统安全目标和具体要求对SIS系统的安全防护进行了设计,详细介绍了安全防护设计方案及其代码实现。  相似文献   

松材线虫分离及不同真菌对松材线虫繁殖的影响     

黄响珠  林秋秋  吴远杰  张灵玲  关雄 《莆田学院学报》2011,18(5):46-50

主要对松材线虫的取样分离进行探索,并初步研究了以真菌作为食料培养松材线虫。结果表明:取样部位对分离效果有影响,蛀孔及蛹室周围分离到的线虫量明显比枝条及树干其他部位多;不同真菌培养松材线虫效果有差异,主要采用了灰葡萄孢、黄瓜镰刀菌和香蕉镰刀菌3种真菌,通过设计不同影响因素比较培养效果,发现灰葡萄孢培养效果较为稳定且最佳,其次是黄瓜镰刀菌。因此,灰葡萄孢和黄瓜镰刀菌可选用于培养松材线虫。  相似文献   

带隔离变压器的Cuk型有源功率因数校正的研究与设计     

桂丽 《科教文汇》2013,(3):97-98

随着电力电子技术的发展,各种电力电子设备应用于电网,给电网带来谐波问题,各种谐波滤波器也应运而生,但这只是一种先污染后治理的被动办法,APFC是一种主动的办法,它用于开关电源前级整流器,输入电流为正弦波,不对电网产生污染。全文围绕一种新颖的基于隔离型Cuk变换器的有源功率因数校正电路的设计,从Cuk变换器的基本单元入手,分析了Cuk变换器的工作原理,在此基础上,确定了基于隔离型Cuk变换器APFC电路的基本拓扑。  相似文献   

论康拉德小说的孤独主题:以《进步前哨》为例     

谌华玉 《赣南师范学院学报》2012,(5):41-45

孤独是康拉德小说深度刻画与反复表现的主题之一。康拉德短篇小说《进步前哨》对孤独主题作了深入思考和深度表述,孤独是人类生活、思考和书写关注的永恒主题,有其不同性质、状态和形态。  相似文献   

Extraction of DNA suitable for PCR applications from mature leaves of Mangifera indica L.     

Muhammad Abubakkar Azmat  Iqrar Ahmad Khan  Hafiza Masooma Naseer Cheema  Ishtiaq Ahmad Rajwana  Ahmad Sattar Khan  Asif Ali Khan 《Journal of Zhejiang University. Science. B》2012,13(4):239-243

Good quality deoxyribonucleic acid (DNA) is the pre-requisite for its downstream applications. The presence of high concentrations of polysaccharides, polyphenols, proteins, and other secondary me- tabolites in mango leaves poses problem in getting good quality DNA fit for polymerase chain reaction (PCR) applications. The problem is exacerbated when DNA is extracted from mature mango leaves. A reliable and modified protocol based on the cetyl- trimethylammonium bromide (CTAB) method for DNA extraction from mature mango leaves is described here. High concentrations of inert salt were used to remove polysaccharides; Polyvinylpyrrolidone (PVP) and β-mercaptoethanol were employed to manage phenolic compounds. Extended chloroform-isoamyl alcohol treatment followed by RNase treatment yielded 950?1050 μg of good quality DNA, free of protein and RNA. The problems of DNA degradation,contamination, and low yield due to irreversible binding of phenolic compounds and coprecipitation of polysaccharides with DNA were avoided by this method. The DNA isolated by the modified method showed good PCR amplification using simple se- quence repeat (SSR) primers. This modified protocol can also be used to extract DNA from other woody plants having similar problems.  相似文献   

一个逐渐“成熟”的声音——论严歌苓小说叙事艺术的嬗变     

昊闽闽 《廊坊师范学院学报》2012,(1):35-37

严歌苓小说中的叙事者常常在小说发展的过程中,对情节的发展进行主观化的阐释和干预,使小说呈现出奇妙的文学景观。纵观其自新时期到新移民的作品可以发现,这个＂叙事者＂是在创作的过程中逐渐显形并慢慢成熟的,而这个成熟的过程正是严歌苓对中西方叙事思想不断选择、吸纳、发展的过程,是对叙事艺术的不断探索和实验的结果。  相似文献   

孤立与不结盟、盟友与敌人、竞争与合作——解析建构主义视角下的外交政策取向     

靳利华 《信阳师范学院学报(哲学社会科学版)》2006,26(2):6-9

从建构主义的角度分析无政府状态下一国外交政策应有三种不同取向。国家行为体的自我利益需求使该国在其特定文化观念中形成孤立与不结盟的外交倾向；国家行为体基于不同的认知形成不同的认知共同体，从而出现盟友与敌人的不同外交政策；国家行为体在认知上的超越及“属有性”个体差异则建构了合作与竞争的外交政策。这些不同的外交政策实际上是国家利益需求在一定时期的一种选择。  相似文献