Reliably Assessing Growth with Longitudinal Diagnostic Classification Models     

Matthew J. Madison 《Educational Measurement》2019,38(2):68-78

Recent advances have enabled diagnostic classification models (DCMs) to accommodate longitudinal data. These longitudinal DCMs were developed to study how examinees change, or transition, between different attribute mastery statuses over time. This study examines using longitudinal DCMs as an approach to assessing growth and serves three purposes: (1) to define and evaluate two reliability measures to be used in the application of longitudinal DCMs; (2) through simulation, demonstrate that longitudinal DCM growth estimates have increased reliability compared to longitudinal item response theory models; and (3) through an empirical analysis, illustrate the practical and interpretive benefits of longitudinal DCMs. A discussion describes how longitudinal DCMs can be used as practical and reliable psychometric models when categorical and criterion‐referenced interpretations of growth are desired.  相似文献   

Digital Module 05: Diagnostic Measurement—The G‐DINA Framework https://ncme.elevate.commpartners.com     

Wenchao Ma  Jimmy de la Torre 《Educational Measurement》2019,38(2):114-115

In this ITEMS module, we introduce the generalized deterministic inputs, noisy “and” gate (G‐DINA) model, which is a general framework for specifying, estimating, and evaluating a wide variety of cognitive diagnosis models. The module contains a nontechnical introduction to diagnostic measurement, an introductory overview of the G‐DINA model, as well as common special cases, and a review of model‐data fit evaluation practices within this framework. We use the flexible GDINA R package, which is available for free within the R environment and provides a user‐friendly graphical interface in addition to the code‐driven layer. The digital module also contains videos of worked examples, solutions to data activity questions, curated resources, a glossary, and quizzes with diagnostic feedback.  相似文献   

测音诊病仪理论初探     

王建明 《人天科学研究》1997,6(3):45-46

元极学理论揭示了万物在运动过程中皆发出音，人体五脏运化发出五脏之音，五脏和谐运化则身体健康，据此，提出了开发测音诊病仪的设想，从理论基础，实践性，可行性等方面进行了论述，认为利用高新科技开发这种设备是可行的。  相似文献   

高层领导者危机诊断失误及其克服——危机管理团队(CMT)的建构     

郭际  吴先华  李南 《科学学与科学技术管理》2007,28(7):177-181,191

随着经济的快速发展，企业环境变化加快，企业经营的不确定性增加，企业危机的危害性和频数增加。研究危机视角的变化使危机诊断成为可能。单凭高层管理者对危机进行诊断有较大的局限性，需要引入危机管理团队（crisis management team，CMT），为提高危机诊断准确性指出一些注意事项。  相似文献   

2005年3月10～12日嘉兴市寒潮大雪成因浅析     

李海军  李云泉 《科技通报》2007,23(5):641-645

分析2005年3月10～12日嘉兴市寒潮、大雪天气过程发现:强寒潮是由乌拉尔阻高东移南垮引起强冷空气南下和前期明显回温共同造成的。500 hPa南支槽前的西南暖湿气流为大雪天气提供了源源不断的水汽;物理量诊断显示,高层辐散、低层辐合和弱的不稳定能量,为大雪的产生提供了动力抬升条件;高空西南暖湿气流突然加强,近地面层有大片逆温层存在,是预报大雪的关键,为今后预报大雪起到了一定参考的作用。  相似文献   

Fault diagnosis for analog circuits based on chaotic signal excitation     

Hong-Guang Ma  Xiao-Fei Zhu  Ming-Shun Ai  Ji-Dong Wang 《Journal of The Franklin Institute》2007,344(8):1102-1112

A fault diagnosis method for analog circuit is proposed in this paper. An all-purpose amplifier is taken as the typical circuit under test (CUT). The chaotic signal, which is generated by an improved Chua's circuit, is employed as the excitation signal of CUT. The algorithm for phase-space reconstruction of chaotic time series is a combination algorithm of multiple autocorrelation and Γ-test. The circuit state is estimated based on detecting the geometric change of Chua's attractor with a data-mining approach. For the purpose of information fusion, another eight features are extracted from the testing data to comprehensively determine the CUT states. A discussion is made for comparing the effectiveness of each feature according to the testing results.  相似文献   

面向需求的应用本体不一致诊断方法研究     

宋丹辉 《现代情报》2016,36(3):27-37

为计算复杂应用本体中非合法蕴含式集合的根本性冲突原因, 首先对现有不一致诊断方法进行系统的梳理, 然后结合应用本体及其需求特点, 分析存在问题与不足, 探讨将原本相互孤立的、分别应用在不同诊断工具中的反模式探测法、根辨解法、简洁辨解法之核心算法进行组合、优化的思路与方法。在此基础上, 提出一个综合性的启发式简洁根辨解诊断法, 阐述其基本思路与具体步骤, 并以相关论文中经常使用的实验本体为例, 验证方法的有效性。  相似文献   

基于RTL行为模型的测试产生及时延测试方法(英)     

李华伟  李忠诚 《中国科学院研究生院学报》2002,(2)

寄存器传输级(RTL)测试产生及时延测试是当今集成电路(IC)测试技术中亟待解决的问题和研究的热点.首先从IC逻辑测试的测试产生和IC时延测试方法这两个方面系统地综述了测试产生和时延测试领域迄今为止的主要研究成果.在RTL行为描述的测试产生方面,提出了新的RTL行为模型的描述方法:行为阶段聚类描述,并提出了基于聚类的测试产生技术.将这些技术集成到RTL级ATPG系统ATCLUB中,在提高测试产生效率及缩短测试长度方面效果显著.在IC时延测试方面,提出了一种新的可变双观测点的时延测试方法。基于该方法提出了新的时延故障诊断方法,实现和完善了可变双观测点的时延测试系统DTwDO.DTwDO提供了从时延测试到故障诊断等一系列测试工具,有效减少了测试通路数,提高了故障覆盖率,并有很高的故障定位成功率.  相似文献   

Influence of an integrated learning diagnosis and formative assessment-based personalized web learning approach on students learning performances and perceptions     

Charoenchai Wongwatkit  Niwat Srisawasdi  Gwo-Jen Hwang 《Interactive Learning Environments》2017,25(7):889-903

The advancement of computer and communication technologies has enabled students to learn across various real-world contexts with supports from the learning system. In the meantime, researchers have emphasized the necessity of providing personalized learning guidance or support by considering individual students’ status and needs in order to improve their learning performance. Based on this perspective, this study proposes a formative assessment-based approach for improving the learning performance of students in a personalized learning environment. An integrated learning diagnosis and formative assessment-based personalized web learning system was developed based on this approach. To evaluate the effectiveness of the proposed approach, an experiment was conducted in an elementary school mathematics course in Thailand. The experimental results showed that (1) the students learning with the proposed system revealed significantly better learning achievement and learning perceptions than those learning with the conventional learning system and (2) students’ learning perceptions of the system had significant relationships with their learning achievement.  相似文献   

On-line broken-bar fault diagnosis system of induction motor     

张荣  王秀和 《天津大学学报(英文版)》2008,14(2):144-147

Induction motor faults including mechanical and electrical faults are reviewed. The fault diagnosis methods are summarized. To analyze the influence of stator current, torque, speed and rotor current on faulted bars, a time-stepping transient finite element (FE) model of induction motor with bars faulted is created in this paper. With wavelet package analysis method and FFT method, the simulation result of finite element is analyzed. Based on the simulation analysis, the on-line fault diagnosis system of induction motor with bars faulted is developed. With the speed of broken bars motor changed from 1 478 r/min to 1 445 r/min, the FFT power spectra and the wavelet package decoupling factors are given. The comparison result shows that the on-line diagnosis system can detect broken-bar fault efficiently.  相似文献