共查询到20条相似文献，搜索用时 343 毫秒
1.
在分析基于工艺元的典型工艺信息组织模式的基础上,提出一种基于数据挖掘技术的从工艺数据中获取工艺元知识的方法.该方法采用文本聚类的思想扫描工艺数据库,将数据库中工艺描述划分为不同的类提取出常用工艺语句并设计了相应的处理算法,通过改进Apriori方法设计的Apriori-seq算法用于对工艺规程序列进行挖掘获取工艺元.同时,开发出在制造工艺序列数据中进行知识发现的原型系统SCU-KDPS,应用表明本文的研究方法有较高的知识发现效率. 相似文献
2.
本文介绍了基于VisualFoxpro、Clipper数据库环境下一种新颖实用的数据库保密口令的设计方法──数据库程序动态保密口令的设计原理及实现方法,并给出进一步改进的原理和方法。 相似文献
3.
俞国红 《廊坊师范学院学报(自然科学版)》2010,10(1)
提出一种智能化数据库中间件的设计思想,力求寻找到一条"应对需求不断变化,快速、高质的开发道路".设计中所采用的组件、中间件等技术均反映了"重用"的原则.整个系统的设计实现了对传统数据库中间件的吞吐量、可重用性、可移植性等方面的改进,为数据库中问件的构造提供了新的思路. 相似文献
4.
基于改进ASP设计的提高执行效率探究 总被引：1，自引：0，他引：1
通过对ASP的不同设计方法进行对比测试,总结出使用存储过程、数据库索引、DLL组件、Action Query指令等提高ASP执行效率的方法,并对ASP程序中的变量的使用等进行改进. 相似文献
5.
从数据库信息安全的防护角度对面向企业网络的数据库信息安全展开了分析讨论,简单介绍了常见数据库安全措施和数据库信息安全的关键问题,重点提出了企业网数据库信息的加密改进思想。对数据库加密平台的实现展开了讨论,从加密模型框架和加密字典的设计两个角度完成了面向企业网数据库的信息安全设计。 相似文献
6.
通过对我校选修课管理过程的分析,提出了基于WEB的网上选课系统的设计思想,简述了网上选课系统的功能和相关的技术实现,着重阐述如何利用ASP以及数据库技术相结合的方法来开发基于动态WEB的选课系统.并在试运行的基础上对系统的进一步完善提出了改进方案. 相似文献
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首先介绍了医学病历的概念、技术特点和常见的数据挖掘技术,然后结合医学病历数据库分析了数据挖掘关联规则Apriori算法的优缺点,提出了一种适应数据多样化、不完整、动态变化的改进Apriori算法。最后设计了基于该方法的医学病历智能辅助诊断模型。临床实验结果表明,改进Apriori算法能较好地提取医学病历数据库中有用信息和知识,为医疗诊断提供较好的辅助决策功能。 相似文献
9.
秦奋涛 《河北北方学院学报(社会科学版)》2003,19(6):16-18
提出了一种基于Petri网的数据库逻辑设计方法,用Petri网统一了 数据库设计的整个过程,形成了新的数据库设计方法. 相似文献
10.
魏建 《广西教育学院学报》2010,(1):136-139
首先介绍了医学病历的概念、技术特点和常见的数据挖掘技术,然后结合医学病历数据库分析了数据挖掘关联规则Apriori算法的优缺点,提出了一种适应数据多样化、不完整、动态变化的改进Apriori算法。最后设计了基于该方法的医学病历智能辅助诊断模型。临床实验结果表明,改进Apriori算法能较好地提取医学病历数据库中有用信息和知识,为医疗诊断提供较好的辅助决策功能。 相似文献
11.
We study the effects of closing and restarting low-performing schools as charter schools in New Orleans and Baton Rouge. Using matched difference-in-differences identification with students in Louisiana, we estimate effects for the students who attended the treated schools at the time of treatment. We find positive and precise effects of closure/restart on elementary/middle school test scores, but no clear effects on high school graduation or college entry in New Orleans. However, in Baton Rouge high schools, the interventions reduced high school graduation by 11–15 percentage points. We also provide evidence about how and why these effects emerge. The variation in test score effects within and across cities is positively related to the increase in school value-added that treated students experienced and negatively related to student age/grade and the extent of student disruption. The effects of school closure and restart therefore depend, predictably, on policy design and implementation. This work builds on prior closure/restart research and helps explain the positive effects of the post-Katrina school reforms in New Orleans. 相似文献
12.
Huriya Jabbar 《教育政策杂志》2013,28(6):751-772
As the city with the largest charter-school market share in the United States, New Orleans, Louisiana exemplifies market-oriented models in education. For a city that is so ‘drenched in the past,’ the reform movement in New Orleans typically neglects historical context, often dismissing the education system pre-Katrina as simply corrupt and dysfunctional. This is an incomplete story. While national narratives and news media tend to downplay these features, there is no local consensus on the reforms. There is mistrust on both sides of the debate, and a growing opposition movement, which arises from decades of racial and political struggles, corrupt public officials, and previous experiences with the state exerting power over locally elected school boards, which disenfranchised African-Americans in New Orleans in particular. Although the new, post-Katrina educational system significantly altered political dynamics, it has not eradicated politics altogether. In this paper, I conduct a policy history of education reforms in New Orleans, connecting the historical and political context to current reform efforts. As researchers evaluate the effectiveness of the new reforms in terms of student achievement, it is important also to examine their impacts on communities and the democratic control of schools, as well as how they reproduce or break from historical patterns of political struggle and inequality. 相似文献
13.
Brian Beabout Alison A. Carr-Chellman Khaled A. Alkandari Luis C. Almeida Husra T. Gursoy Ziyan Ma 《Journal of Education for Students Placed at Risk》2013,18(2-3):212-237
This exploratory study seeks to understand the perceptions of New Orleans educators on the process of rebuilding the school system destroyed by Hurricane Katrina in August, 2005. Interviews with 10 educators and extensive document analysis allowed for an exploration of the phenomenology of this unique case of school reform in response to a natural disaster. Using the theoretical framework of chaos theory, the data reveal that this instance of school reform is influenced heavily by the uncertainties of life in post-Katrina New Orleans and that the presence of both hope and pessimism for positive change indicate a slower, less dramatic change in the New Orleans Public Schools (NOPS) than some had predicted. 相似文献
14.
The rigidity of teachers unions has been given as a primary reason for their lack of representation among America’s rapidly growing, although still relatively small, charter school sector. In the case of post-Hurricane Katrina New Orleans, the city rapidly converted from a union-backed teacher workforce to a largely nonunionized charter school workforce in the years following state takeover and charter conversion. This makes the recent emergence of two single-school unions in charter schools there worthy of study. As the teachers attempt to organize single-school unions in a nearly all charter school system, what are their motivations? This case study of one of New Orleans’ emerging charter school unions found that pay inequities, job insecurity, a lack of teacher voice in school-level decisions, and a culture of compliance, all motivated teachers to seek unionization. Teachers hoped to promote equity and teacher involvement with their union, but the organizing effort did strain some relationships, particularly those involving middle management. 相似文献
15.
非计算机专业数据库实验探究 总被引：1，自引：0，他引：1
针对理科性较强的非计算机专业,计算机基础薄弱,但对数据库技术要求较高的特点,给出一些新的方法。通过调整实验教学模式,注重设计过程、程序的调试,强调辅助工具的应用及帮助文件的使用,并且构建科学合理的指标体系评价学习和教学效果,提高了数据库实验教学的质量。 相似文献
16.
俞国红 《河北职业技术学院学报》2010,(1)
提出一种智能化数据库中间件的设计思想,力求寻找到一条应对需求不断变化,快速、高质的开发道路。设计中所采用的组件、中间件等技术均反映了重用的原则。整个系统的设计实现了对传统数据库中间件的吞吐量、可重用性、可移植性等方面的改进,为数据库中间件的构造提供了新的思路。 相似文献
17.
Kristen L. Buras 《The Educational forum》2016,80(2):154-170
AbstractThis article chronicles the mass firing of veteran teachers in New Orleans, most of them African American, following Hurricane Katrina. The role of Teach for -America in providing inexperienced White teacher recruits from outside the community is critiqued. Countering the ahistorical discourse that blames Black veteran teachers for the shortcomings of New Orleans public schools, the author reveals what is lost if the culture of the community is replaced by the culture of the market. 相似文献
18.
A CAD／CAE system of the ring-type planetary reducer with small tooth number difference is presented.It is a parameterized CAD/CAE system adopting the object-oriented technique and comprising in itself the geometric feature database(including the modules of ring-plates with ineer te4eth,eccentric shaft modules and output shaft modules),standard componentdatabase and material database.In cdomparison with design by handwork,this computer aided design and analysis system has the advantages of improved quality,shortened design period and reduced cost.The reliability of the system has been verified by a illustrative example. 相似文献
19.
康斯坦特.纽文惠斯的＂新巴比伦＂作为一种富有远见的建筑设计方案在赛博空间理论方面有重要发现,成为当今重组城市化与数据库建筑的典型案例。数据库建筑概念不只是一种信息论的体现,更重要的是代表了一种面向未来的智能环境建筑理念。数据库建筑借助计算机辅助设计手段,意味着建筑发展趋向无限可能的艺术形式,并促成完全虚拟的建筑设计和建造,可能让人们居住在赛博空间,居住在完全由信息构造的建筑物里。人在本性上的有限、自由、游戏、无家可归成为重审＂新巴比伦＂、正视数据库建筑的重要基础。 相似文献
20.
2011年美国教育研究协会(AERA)年会在美国路易斯安那州新奥尔良市召开。通过对"教学技术"、"学习科学"、"非正式环境中的学习"、"技术·教学·认知·学习"、"技术作为教与学的变革代理"、"教师专业发展"、"在线教与学"、"虚拟学习环境应用研究"、"新兴技术"、"大脑、神经科学和教育"十个有关教育技术的专题进行评述,并结合AERA2009、2010年会的情况,对本次年会的研究特点和趋势进行概括和分析,希望能让国内读者对本次大会的整体情况和相关领域的研究动态有所了解。 相似文献