大规模模拟电路的ATPG实现

要使现有的模拟电路故障诊断算法适用于大规模电网络,必须将大规模网络分解成互不耦合的小规模网络。本文讨论了将支路撕裂法用于大规模模拟电路的快速ATPG,给出了文献〔1〕中算法的五个缺陷,并对之逐一进行了解决。并在altos-68000上用FORTRAN77编制了一个可以完成200条支路,40个节点以内的任意可撕裂的线性网络的故障定位通用程序LAFDP。文中给出运用程序LAFDP进行故障定位的例子。     

Networks of knowledge: how farmers and scientists understand soils and their fertility. a case study from Ethiopia

This paper explores knowledge about soils and their fertility from the perspective of different players, including both scientists and farmers. Different understandings of soils and their management are seen to be bound up with the contexts within which knowledges about soils are created—the networks of players engaged in building knowledge, the settings within which ideas about soils are tested and examined, and the wider assumptions and beliefs that different people carry with them. The contrasting, and sometimes overlapping, understanding of soils by farmers, scientists and development practitioners in Ethiopia is focused on. Drawing on a range of documentary material and detailed fieldwork carried out in Wolayta, southern Ethiopia, over a number of years, the paper argues that a focus on the contexts for the generation of different knowledges helps avoid the unhelpful distinctions often made between indigenous and scientific knowledges, and moves analytical attention towards an assessment of who is involved in knowledge creation and the power relations implied. The paper concludes with a discussion of how multiple knowledges about soils and their fertility might interact in the context of meeting agricultural development challenges and the potential for a productive engagement between different actors and networks.     

代言星空,谁最耀眼?

2004雅典奥运早已曲终人散。然而从雅典回来的奥运巨星们却在今天的广告界着实狠狠火了一把。正所谓“时势造英雄”。胜为王,奥运冠军们还没有踏上祖国的土地时已经有很多企业捧着钞票排起队争先请他们做品牌代言人了。刘翔、姚明,成为雅典盛会之后点击频率最高的词汇。也成了人们茶余饭后最时尚的谈资。同样,他们也在2005年最受大众喜欢的十大明星榜中闪亮登场,熠熠发光。     

构建信息安全基石 实现数据库“中国造”

达梦数据库历经了20多年的发展,从DM1.0到DM5.6,已经成功发布了六代产品.     

大规模模拟电路故障定位快速算法及实现

要使现有的模拟电路故障诊断算法适用于大规模电网络,必须将大规模网络分解成互不耦合的小规模网络。文献[1]给出了一种快速定位算法(算法Ⅰ),但未考虑容差。本文从解决模拟电路故障诊断中最棘手的问题——容差、在线计算量和离线计算量的目的出发,将故障预测技术、替代理论和迭加定理运用到支路撕裂法中,从而得到一个新的大规模模拟电路的快速故障定位算法(算法Ⅱ),同时对算法Ⅰ、Ⅱ进行了FORTRAN编程实现。研究结果证明,算法Ⅰ、Ⅱ适用于小、大规模网络的单、多故障诊断。当网络被连续监测时,算法Ⅱ的稳健性、计算量和存贮器要求均较算法Ⅰ有较大改进。文中举了一个有源电路的实例,验证了上述论断的有效性。