华南某预选低中放废物处置场岩土层渗透性能综合研究

采用渗水、注水、压水、抽水及室内渗透试验等多种测试方法,对我国华南某一预选低中放废物处置场内各岩土层的渗透特性进行分层测试,通过多种方法的综合研究得出处置场地内各岩土层的渗透系数,并基于计算结果评价各岩土层的渗透性能,指出区内微风化花岗岩可作为低中放废物的处置底板,中等风化花岗岩可作为备选处置底板,而冲积黏土则是处置单...     

Hadoop下并行遗传算法研究及在应急设施选址中的应用

随着云计算的出现,大数据的概念也随之产生。自然灾害日趋增多,要求应急设施的部署规模不断扩大,这时,如何有效进行大规模应急设施的选址成为应急管理系统的关键。因此,提出一种改进的并行遗传算法并在Hadoop平台上编程实现,并应用于求解应急设施选址问题的集合覆盖模型,达到求解应急设施选址的目的。试验结果表明,改进的并行遗传算法不管在获取全局最优解上还是在求解大规模应急设施选址的时效性上都优于原有算法,是一种云计算环境下有效的应急设施选址问题求解算法。     

分布式数据库复制问题的一种解决方案及应用

分布式数据库系统中的复制机制有许多优点,但同时也带来一些问题,解决这些问题的方法有很多。针对这些问题,从需求分析、数据分片和分布、异步复制、数据更新、复制模式、数据冲突、查询处理等多方面因素进行考虑,根据实际情况,选择或改进其中的方法,从而形成一种新的解决分布式数据库复制问题的方案,并将其应用到一个实际的出版物发行信息系统之中,较为完善地解决复制问题。     

基于SOA的制造业MRPⅡ系统的研究与实现

随着制造资源计划(MRPⅡ)在制造行业的推广和应用,如何设计一个业务敏捷的MRPⅡ系统已经成为一种发展趋势。本文依据某制造企业的实际情况,结合面向服务构架(SOA)理念,设计出一种基于SOA的MRPⅡ系统的实现方案,着重研究了生产管理模块的设计与实现,详细分析生产管理的主要模块如MRP计算等,最后详细介绍了该系统4层架构的实现。     

基于蚂蚁算法的制造资源搜索调度研究

本文基于对制造资源调度和发现过程的分析研究,建立实用的制造资源调度器模型和调度策略,然后采用蚂蚁算法对制造资源的调度快表做出优化,并做出有关的实验和数据分析。该方法能够有效地实现制造资源的作业的合理调度和实现分布式系统的负载平衡,提高了制造资源搜索的成功率。     

A manufacturing XML schema definition and its application to a data management system on the shop floor

Digitization for sharing knowledge on the shop floor in the machinery industry has been given much attention recently. To help engineers use digitization practically and efficiently, this paper proposes a method based on manufacturing case data that has a direct relation to manufacturing operations. The data are represented in XML schema, as it can be easily applied to Web-based systems on the shop floor. The definitions were made for eight manufacturing methods including machining and welding. The derived definitions consist of four divisions of metadata, work-piece, process and evaluation. Three divisions except for the “process” division are common to the manufacturing methods. The average number of elements for a manufacturing method is about 200. The represented schema is also used to convey knowledge such as operation standards and manufacturing troubleshooting on the shop floor. Using the definitions, a data management system is developed. It is a Web-based Q&A system, in which the engineers specify the manufacturing case data mainly by selecting from the candidates. Then, the system fills in the blank portions and/or shows messages to help complete the case data. The proposed method is evaluated through practical scenarios of arc welding and machining.     

Modelling user experience with web sites: Usability, hedonic value, beauty and goodness

Recent research into user experience has identified the need for a theoretical model to build cumulative knowledge in research addressing how the overall quality or ‘goodness’ of an interactive product is formed. An experiment tested and extended Hassenzahl’s model of aesthetic experience. The study used a 2 × 2 × (2) experimental design with three factors: principles of screen design, principles for organizing information on a web page and experience of using a web site. Dependent variables included hedonic perceptions and evaluations of a web site as well as measures of task performance, navigation behaviour and mental effort. Measures, except Beauty, were sensitive to manipulation of web design. Beauty was influenced by hedonic attributes (identification and stimulation), but Goodness by both hedonic and pragmatic (user-perceived usability) attributes as well as task performance and mental effort. Hedonic quality was more stable with experience of web-site use than pragmatic quality and Beauty was more stable than Goodness.     

Utilize bootstrap in small data set learning for pilot run modeling of manufacturing systems

If the production process, production equipment, or material changes, it becomes necessary to execute pilot runs before mass production in manufacturing systems. Using the limited data obtained from pilot runs to shorten the lead time to predict future production is this worthy of study. Although, artificial neural networks are widely utilized to extract management knowledge from acquired data, sufficient training data is the fundamental assumption. Unfortunately, this is often not achievable for pilot runs because there are few data obtained during trial stages and theoretically this means that the knowledge obtained is fragile. The purpose of this research is to utilize bootstrap to generate virtual samples to fill the information gaps of sparse data. The results of this research indicate that the prediction error rate can be significantly decreased by applying the proposed method to a very small data set.     

将WEB挖掘技术应用于教学网站之实践

该文在研究Web挖掘系统、关联规则的基础上,提出了一种采用关联规则的方法解决网络拥塞问题,通过对服务器的访问日志进行挖掘,得到用户访问序列的关联规则,将这些规则应用到客户浏览,把用户随后最有可能访问的网页预先传送到用户本地,来提高访问速度。论述了该方法的实现方案、算法、运行的环境以及对该方法的分析。     

浅谈报业网站的生存与发展

得益于互联网技术的成熟,报社由单纯纸质媒体转为多种经营,报业网站也如雨后春笋般篷勃发展,由于报业网站主体是报社这个特殊性,报业网站作为网络新闻媒体,与报纸间的关系非常密切,报业网站与传统媒体间正形成一种既相互合作又相互竞争的互相依存和相互促进的关系,究竟是优势还是劣势?以后又将如何进一步发展和壮大?笔者就此提出自己的一些看法——