攻击模型BBFPAN分层的新方法

针对以模糊Petri网为理论基础的网络攻击模型BBFPAN自学习能力差的缺点,提出了一种新的适用于对攻击模型BBFPAN进行层次式划分的分层算法,为将神经网络理论引入攻击模型的研究奠定了基础。     

基于petri网的自动信任协商理论研究

在以往的自动信任协商研究中,Petri网很少被用于构造策略模型。提出一种基于petri网的自动信任协商进行合理建模和分析,提供了形式化建模方法和验证,并通过VC程序对其进行了模拟验证,达到了对自动信任协商理论研究的目的。     

基于模型驱动技术的XML表单开发

采用数据驱动的方法来构建标准化格式支持的、易理解的、可移植的表单。任何软件系统的开发都需要创建表单来收集用户输入的数据,表单在用户输入和软件系统的业务流程中担当了关键角色。     

Fuzzy control of dithered chaotic systems via neural-network-based approach

This paper presents an effective approach for controlling chaos. First, a neural-network (NN) model is employed to approximate the chaotic system. Then, a linear differential inclusion (LDI) state-space representation is established for the dynamics of an NN model. Based on the LDI state-space representation, a fuzzy controller is proposed to tame the chaotic system. If the designed fuzzy controller cannot suppress the chaos, a high frequency signal, commonly called dithers, is simultaneously injected into the chaotic system. According to the relaxed method, an appropriate dither is introduced to steer the chaotic motion into a periodic orbit or a steady state. If the frequency of dither is high enough, the trajectory described by the dithered chaotic system and that of its corresponding mathematical model—the relaxed system can be made as close as desired. This phenomenon enables us to get a rigorous prediction of the dithered chaotic system’s behavior by obtaining the behavior of the relaxed system. Finally, a numerical example with simulations is given to illustrate the concepts discussed throughout this paper.     

Effects of creating video-based modeling examples on learning and transfer

Two experiments investigated whether acting as a peer model for a video-based modeling example, which entails studying a text with the intention to explain it to others and then actually explaining it on video, would foster learning and transfer. In both experiments, novices were instructed to study a text, either with the intention of being able to complete a test (condition A), or being able to explain the content to others (condition B and C). Moreover, students in condition C actually had to explain the text by creating a webcam-video. In Experiment 1 (N = 76 secondary education students) there was no effect of study intention on learning (A = B), but explaining during video creation significantly fostered transfer performance (C > B; C > A). In Experiment 2 (N = 95 university students), study intention did have an effect on learning (C > A; B > A), but only actual video creation significantly fostered transfer performance (C > A).     

信任对科技论文快速共享意愿的影响——基于中国科技论文在线的实证研究

科研人员是否愿意接受科技论文快速共享模式受到信任等多种因素的影响.文章以中国科技论文在线为例,通过问卷调查和结构方程模型进行实证研究,结论表明信任通过态度对科研人员共享未发表论文的意愿产生间接影响作用.     

逆向工程技术的研究与工程应用

分析了逆向工程技术的理论,工程流程和工程过程,以及逆向工程的结构;探讨和研究了逆向工程的数据测量,数据处理和曲面建模3个主要模块,并研究了逆向工程在内燃机气道方面的应用。     

Economic evaluation research in the context of Child Welfare policy: a structured literature review and recommendations

Objectives

With over 1 million children served by the US Child Welfare system at a cost of $20 billion annually, this study examines the economic evaluation literature on interventions to improve outcomes for children at risk for and currently involved with the system, identifies areas where additional research is needed, and discusses the use of decision-analytic modeling to advance Child Welfare policy and practice.

Methods

The review included 19 repositories of peer-reviewed and non-peer-reviewed “gray” literatures, including items in English published before November, 2009. Original research articles were included if they evaluated interventions based on costs and outcomes. Review articles were included to assess the relevance of these techniques over time and to highlight the increasing discussion of methods needed to undertake such research. Items were categorized by their focus on: interventions for the US Child Welfare system; primary prevention of entry into the system; and use of models to make long-term projections of costs and outcomes.

Results

Searches identified 2,640 articles, with 49 ultimately included (19 reviews and 30 original research articles). Between 1988 and 2009, reviews consistently advocated economic evaluation and increasingly provided methodological guidance. 21 of the original research articles focused on Child Welfare, while 9 focused on child mental health. Of the 21 Child Welfare articles, 81% (17) focused on the US system. 47% (8/17) focused exclusively on primary prevention, though 83% of the US system, peer-reviewed articles focused exclusively on prevention (5/6). 9 of the 17 articles included empirical follow-up (mean sample size: 264 individuals; mean follow-up: 3.8 years). 10 of the 17 articles used modeling to project longer-term outcomes, but 80% of the articles using modeling were not peer-reviewed. Although 60% of modeling studies included interventions for children in the system, all peer-reviewed modeling articles focused on prevention.

Conclusions

Methodological guidance for economic evaluations in Child Welfare is increasingly available. Such analyses are feasible given the availability of nationally representative data on children involved with Child Welfare and evidence-based interventions.

Practice implications

Policy analyses considering the long-term costs and effects of interventions to improve Child Welfare outcomes are scarce, feasible, and urgently needed.     

Teaching probability: a socio‐constructivist perspective

There is a considerable and rich literature on students' misconceptions in probability. However, less attention has been paid to the development of students' probabilistic thinking in the classroom. This paper offers a sequence, grounded in socio‐constructivist perspective for teaching probability.