基于SQL的多条件选择智能实现算法

B/S架构的信息系统开发中,一般情况下,根据用户的选择,n个条件的输入组合数是2n个。但是,该文中提出的算法,其组合数仅为n到n(n+1)/2,大大简化了编程。     

Rule acquisition and attribute reduction in real decision formal contexts

Formal Concept Analysis of real set formal contexts is a generalization of classical formal contexts. By dividing the attributes into condition attributes and decision attributes, the notion of real decision formal contexts is introduced. Based on an implication mapping, problems of rule acquisition and attribute reduction of real decision formal contexts are examined. The extraction of “if–then” rules from the real decision formal contexts, and the approach to attribute reduction of the real decision formal contexts are discussed. By the proposed approach, attributes which are non-essential to the maximal s rules or l rules (to be defined later in the text) can be removed. Furthermore, discernibility matrices and discernibility functions for computing the attribute reducts of the real decision formal contexts are constructed to determine all attribute reducts of the real set formal contexts without affecting the results of the acquired maximal s rules or l rules.     

Hibernate框架下信息系统数据初始化问题的研究

由于对象关系映射(ORM)采用了一种完全不同的数据访问方式,为了使原有信息系统的数据迁移到采用了ORM框架的新系统后仍然保持数据的完整性和一致性,使用poi读取excel文件的结构化数据,使用java反射技术将读取的数据组装成对象。使用开源的ORM框架Hibernate将对象导入数据库中。结果表明该方案可以保证信息系统初始化后数据的完整性,从而解决了采用ORM框架的信息系统数据初始化问题。     

基于移动互联网的兵团旅游信息系统

为提高新疆生产建设兵团旅游的信息化水平,解决兵团旅游信息分散、业务耦合度低、信息不对称等问题,基于移动互联网技术,在搭建SQLServer2008和SQLite旅游信息数据库的基础上,利用HTTP协议和JSON数据格式进行数据的交换,采用MVC结合单例模式和JAVA三层架构实现客户端和服务器端的设计与开发,面向本地企业构建了包含景点介绍、线路规划、服务推荐等功能为一体的APP系统.提高了旅游企业的工作效能,改善了用户体验.系统的架构和方法可为相关移动互联网的软件开发提供参考.     

Detecting and resolving deadlocks in mobile agent systems

Mobile agents environment is a new application paradigm with unique features such as mobility and autonomy. Traditional deadlock detection algorithms in distributed computing systems do not work well in mobile agent systems due to the unique feature property of the mobile agent. Existing deadlock detection and resolution algorithms in mobile agent systems have limitations such as performance inefficiency and duplicate detection/resolution when multiple mobile agents simultaneously detect/resolve the same deadlock. To address these problems, we propose an improved deadlock detection and resolution algorithm that adopts priority-based technique and lazy reaction strategy. The priority-based technique aims to ensure that there is only one instance of deadlock detection and resolution, and it also helps reduce mobile agent movement and data traffic together with the lazy reaction strategy. The liveness and safety properties of the proposed algorithm are proved in this paper. Theoretical analysis and experimental results show that the proposed algorithm provides better performance in terms of agent movement, data traffic, and execution time.     

基于智能流量预测的入侵检测方法

为了提高入侵检测系统检测的实时性,提出了一种基于智能流量预测的入侵检测方法。该方法拟合了智能Agent的智能性、自主性和自适应性的优点以及灰色预测对不确定资源的科学预测的优点,用流量预测智能Agent预测得到的流量序列来代替未来一段时间段内的实际流量,并把这个预测序列作为检测对象集的一部分。然后用人工方法模拟了流量处理Agent与预测智能Agent的活动,并通过对实际的采集数据进行仿真,实验证明了预测智能Agent的预测活动的科学性。     

岩体质量多因素综合评分方法效果分析

岩体质量是评价岩体稳定性的关键。简述了水利水电围岩工程地质分类法、岩体RMR系统分类法、Barton系统分类法等岩体质量多因素评分方法,并以某水电站右岸坝基某一开挖面为例,在综合考虑岩体强度、地下水、地应力、结构面参数、工程地质性状、风化卸荷,以及钻孔资料等的基础上,探讨了不同岩体质量多因素综合评分方法在岩体质量分级中的一致性和精确性。结果表明:以花岗岩为主的坝基开挖面,岩体质量分级采用岩体RMR系统分类法、Barton系统分类法较准确,且具有良好相关性。     

溢洪道底板空蚀发生位置及抗空蚀措施分析

以肯斯瓦特水利枢纽工程为例,通过水工模型试验,测试其设计水位工况下和泄洪消能标准水位工况下溢洪道泄洪时底板的流速及压力分布,并根据空化理论模型对其底板沿程空化数进行了计算。结果表明:可以通过溢洪道流速特性和底板压力分布来分析过流面的空化空蚀特点;在实际工程中,可采用优化过流面的体形、设置掺气减蚀设施、控制溢流面的不平整度以及使用抗空蚀材料等方法来防止空化和空蚀的发生。     

渠道工程中保温板防冻胀设计

我国北方大部分地区都属于季节性冻土地区,输水渠道经常会由于地基的冻胀而遭到不同程度的破坏。目前虽有不少地区的输水渠道采用了聚苯乙烯保温板防冻胀措施,而且取得了一定的效果,但聚苯乙烯保温板防冻胀设计还处在初级阶段。提出渠道工程中保温板防冻胀的设计方法,首先介绍了聚苯乙烯保温板的物理、力学以及冻融循环特性;然后论述了干燥和湿润状态下如何选取保温板厚度;最后结合工程实例说明了设计过程。对同类工程的设计有参考借鉴意义。