An Automated Item Pool Assembly Framework for Maximizing Item Utilization for CAT

Computerized adaptive testing (CAT) has gained deserved popularity in the administration of educational and professional assessments, but continues to face test security challenges. To ensure sustained quality assurance and testing integrity, it is imperative to establish and maintain multiple stable item pools that are consistent in terms of psychometric characteristics and content specifications. This study introduces the Honeycomb Pool Assembly (HPA) framework, an innovative solution for the construction of multiple parallel item pools for CAT that maximizes item utilization in the item bank. The HPA framework comprises two stages—cell assembly and pool assembly—and uses a mixed integer programming modeling approach. An empirical study demonstrated HPA's effectiveness in creating a large number of parallel pools using a real-world high-stakes CAT assessment item bank. The HPA framework offers several advantages, including (a) simultaneous creation of multiple parallel pools, (b) simplification of item pool maintenance, and (c) flexibility in establishing statistical and operational constraints. Moreover, it can help testing organizations efficiently manage and monitor the health of their item banks. Thus, the HPA framework is expected to be a valuable tool for testing professionals and organizations to address test security challenges and maintain the integrity of high-stakes CAT assessments.     

《机床数控技术》教学改革的探索与实践

本文阐述了《机床数控技术》理论与实践教学改革尝试的一些工作。提出了改革理论教学,实施研讨式教学法,改革实践教学,实施三段式数控编程实训方案的改革思路,详细介绍了具体的实施步骤和措施,就实施改革的教学效果作了总结。     

多屏证券行情揭示系统的设计

针对证券交易手段多样化的特点,提出一种基于多屏技术的行情揭示设计方法。阐述了证券行情的发布与揭示过程,介绍了行情数据库的结构和多屏控制卡的工作机制。用C语言直接对行情库进行读取,在光栅图形工作方式下通过调用不同的字模来显示大点阵字符信息,通过汇编语言对多屏卡底层的控制来实现工作屏的切换和写屏过程。计出的系统具有揭示信息丰富、实时性高、配置灵活、成本低等特点。     

基于模糊推理和模糊多目标规划的配电网电容器优化配置

采用逐步规划的方法进行配电网电容器优化配置．以节点的电压水平和降损能力作为指标,采用模糊推理的方法计算每个节点的补偿适宜度,取补偿适宜度最大的节点为补偿节点;以三个时间段负荷方式的能量损耗及峰值负荷的网损减少为目标,应用模糊多目标规划的方法计算该补偿节点的电容器补偿容量;考虑各个补偿点之间的补偿容量相互影响的问题,采用循环计算的方法重新计算已有补偿点的最佳电容器配置容量．实际系统算例分析表明该方法的有效性和实用性．     

考虑两类消费对象的最优投资消费决策问题

研究了具有异常波动的金融市场中的最优投资消费问题,考虑投资者的消费对象同时包括可存品与非可存品的情况．首先建立了最优投资消费问题的随机控制模型,然后运用动态规划原理,对于幂效用函数情形,得到了最优投资组合与消费选择的显式解,最后对最优解进行了分析说明．     

Penalized interior point approach for constrained nonlinear programming

A penalized interior point approach for constrained nonlinear programming is examined in this work. To overcome the difficulty of initialization for the interior point method, a problem equivalent to the primal problem via incorporating an auxiliary variable is constructed. A combined approach of logarithm barrier and quadratic penalty function is proposed to solve the problem. Based on Newton's method, the global convergence of interior point and line search algorithm is proven.Only a finite number of iterations is required to reach an approximate optimal solution. Numerical tests are given to show the effectiveness of the method.     

饮料容器的优化设计方案

建立了饮料容器的优化的设计方案。该方案兼顾圆台状饮料容器的不同壁厚度与焊缝长度,引入黄金分割和压强的概念分别刻画其美观度与安全性能,建立以用料最省、焊缝最短、美观、安全为目标函数,以体积一定为约束条件的非线性规划模型。通过拉格朗日乘数法求得其高度与底面半径关系的解析式并代入数据,利用SPSS 10.0统计软件予以验证,最终利用Matlab 7.0软件编程求解得到饮料容器的最优设计方案。该设计方案可供生产商参考。     

浅谈合作学习教学策略在职业生涯规划课程中的运用

合作学习强调只有在一个更大的合作背景下,竞争和个体化努力才能真正有效.因此,在高校学生职业生涯规划中,引入合作学习的理念将丰富职业生涯规划的教育形式和内涵.从育人的角度出发,在合作学习的过程中丰富学生的学习认知和经验,通过合作学习,进一步转变学生的择业思想和学习观念.     

What Canadian youth tell us about disclosing abuse

ObjectiveTo report findings from a study of anonymous disclosures of abuse experiences among a national sample of youth in Canada who participated in violence prevention programming.MethodsA qualitative analysis was done of a purposeful sample of 1,099 evaluation forms completed following Red Cross RespectED violence prevention programming delivered between 2000 and 2003. Forms were selected based on program facilitators identifying voluntary, anonymous disclosures by youth participants of neglect and emotional, physical, and sexual abuse. Additional data for this analysis includes 27 interviews and focus groups that were used to understand the context of these disclosures and to engage the help of youth and program facilitators in the interpretation of findings.ResultsWhile this study is exploratory and non-representative in its design, findings suggest high rates of hidden abuse, with less than a quarter of youth with abuse experiences reporting a disclosure. Disclosure patterns vary with boys, youth aged 14–15, victims of physical abuse, and those abused by a family member being most likely to disclose to professionals or the police. Interviews help to explain the large number of youth who express reticence to disclose to professionals. Specifically, the data show a perception among youth of negative consequences following disclosure.ConclusionsThis data raises questions regarding why youth are reluctant to report abuse to professionals, preferring to cope independently or by confiding in peers. Youth in this study report feeling anxious about disclosing to authorities, fearful of the potential loss of control over decisions which affect them.Practice implicationsFindings suggest that professionals who provide support to young people's own networks of family and friends may help to facilitate youths’ disclosures of abuse. Furthermore, prevention programming that promotes a positive attitude towards disclosure of abuse experiences and provides an anonymous forum (such as an evaluation form) in which to do so is likely to encourage more young people to disclose.     

Windows CE5．0平台下Winsock编程的应用

论述了Windows CE的网络通信体系结构以及Windows CE下的Winsock网络编程的基本原理,然后使用eMbedded Visual C＋＋4．0,调用Windows CE平台提供的Socket API函数。实现了基于Windows CE的客户端和桌面Windows系统的服务器的通信．