基于SMS的网络监控系统的设计与实现

网络管理的复杂需求情况下,基于SNMP的Cacti能够较好地维护被管理设备。文章在此基础上设计并实现了基于SMS硬件平台的网络设备的监控系统,并根据预置的触发条件,把事件命中触发后的相关信息通过短信发送给网管．从而实现全网设备状态自动监控和设备特定事件的无线警告。系统达到了预期的研究效果,提高了网络管理的自动化和智能化程度,增强了网络运行的安全性。     

基于朴素贝叶斯分类的手机垃圾短信过滤系统

该文介绍一种手机垃圾短信过滤的方法,通过将朴素贝叶斯分类技术与黑名单技术相结合,应用于垃圾短信的过滤中。全文详细介绍了过滤系统的结构和流程,为了进一步提高分类器的准确性,对朴素贝叶斯分类多元模型公式进行了相应改进。     

How causal knowledge simplifies decision-making

Making decisions can be hard, but it can also be facilitated. Simple heuristics are fast and frugal but nevertheless fairly accurate decision rules that people can use to compensate for their limitations in computational capacity, time, and knowledge when they make decisions [Gigerenzer, G., Todd, P. M., & the ABC Research Group (1999). Simple Heuristics That Make Us Smart. New York: Oxford University Press.]. These heuristics are effective to the extent that they can exploit the structure of information in the environment in which they operate. Specifically, they require knowledge about the predictive value of probabilistic cues. However, it is often difficult to keep track of all the available cues in the environment and how they relate to any relevant criterion. This problem becomes even more critical if compound cues are considered. We submit that knowledge about the causal structure of the environment helps decision makers focus on a manageable subset of cues, thus effectively reducing the potential computational complexity inherent in even relatively simple decision-making tasks. We review experimental evidence that tested this hypothesis and report the results of a simulation study. We conclude that causal knowledge can act as a meta-cue for identifying highly valid cues, either individual or compound, and helps in the estimation of their validities.     

基于柔度曲率矩阵差的损伤结构识别方法

为了提高柔度法应用于结构损伤识别的范围和准确度,提出了一种柔度曲率矩阵差的损伤识别新指标,并在柔度法理论基础上进行了改进.通过简支梁和连续梁的算例对这种识别指标的有效性进行了验证,同时采用了另外3种识别指标进行了对比.结果表明：在单处损伤和多处损伤的情况下,使用该指标仅需前一阶模态数据就能对文中梁结构进行准确的损伤定位,并对结构轻微的损伤进行了准确识别.与文中的另外3种损伤指标相比,新指标具有明显的优势,且更具准确性和广泛性.     

How practice produces suboptimal heuristics that render backup instruments ineffective

The operation of machines typically requires attention to instruments that signal the state of the machine. One safeguard against primary instrument malfunction is to provide backup instruments, but this works only if the operators react to malfunction by switching attention to the backups. Little is known about the effect of negative outcomes or feedback on allocation of attention to backup instruments. Four experiments demonstrated that prior practice causes operators of a simulated machine to adapt to instrument malfunction by changing to a suboptimal decision rule rather than by reallocating attention to a different set of instruments. This fallacy appears linked to the operators' failures to notice feedback that they should switch during the simulations and operators' failures to correctly interpret outcome feedback following the simulations. The results raise theoretical questions and warn interface designers not to overrate backup instruments.     

在两个圈的直积图上的平衡二元映射

对于直积图G=Cm□Cn,f：V（G）→Z2={0,1}是任意一个定义在顶点集上的二元映射,定义110=f1（0）,V1=f1（1）。若│┃V1┃-V0┃-┃│≤1,则称映射,是平衡的。f可以自然诱导出一个定义在边集E（G）上的二元映射以：E（G）→Z2,且fE（xy）=f（x）＋f（y）。令E0=fE1（0）,E1=fE-1（1）,那么D（G,f）=┃E1（f）┃-┃E0（f）┃。文章通过在两个圈的直积图Cm□Cn上构造一系列平衡二元映射的方法,完全确定了在平衡映射下的边差集D（Cm□Gn）。     

Development and performance evaluation of an innovative low-cost seismic isolator

This paper proposes an innovative low-cost isolator with lightweight and cost-effective features for use in low-rise residential buildings.The low-cost laminated isolator is formed by plastic shims with unsaturated polyester fiber reinforcement between rubber layers.Performance tests are systematically carried out to characterize the isolator in terms of mechanic behavior(e.g.,compression,shear,and their relationship),dynamic properties(e.g.,damping),and ultimate states.A design guideline and associated criteria of the low-cost isolator are also provided and discussed in this study.To investigate more detailed behavior,a finite element model of the isolator is developed in ABAQUS and calibrated by the experimental data.The research presented in this paper makes significant contributions to the evaluation of the peak stress and strain demands on isolator’s components and provides technical support for the design and manufacturing of this new type of isolator.     

Integrating Standard Dependency Schemes in QCSP Solvers

Quantified constraint satisfaction problems (QCSPs) are an extension to constraint satisfaction problems (CSPs) with both universal quantifiers and existential quantifiers.In this paper we apply variab...     

基于DOM树与领域本体的Web抽取方法

为解决异构DeepWeb结果页面中数据区域及数据记录的自动抽取问题,提出一种基于DOM树与领域本体的Web抽取方法。利用数据内容特征以及领域本体库标记DOM树的节点,按照结果页面展示规律定位数据区域,根据改进的简单树匹配算法,定位数据区域及数据记录。实验结果表明,该方法定位数据区域及数据记录的F-measure值比传统的抽取方法高2.93%~6.67%。