Student self-assessment: why do they do it?     

Zi Yan  Gavin T. L. Brown  John Chi-Kin Lee  Xue-Lan Qiu 《教育心理学》2020,40(4):509-532

Abstract

This study explores factors that predict students’ self-assessment intentions and practices using a framework based on the Theory of Planned Behaviour (TPB). A total of 1425 Hong Kong students (Primary 4 to Secondary 3) participated in this study. Students’ intentions and practices pertaining to self-assessment and the predictors of their intentions and practices were assessed with 11 self-report scales aligned to the TPB constructs. The psychometric properties of scales were examined with Rasch analysis and the relations among the variables were investigated with path analysis based on Rasch-calibrated person measures. The results showed that attitude, subjective norms, self-efficacy, and perceived controllability were statistically significant predictors on intention to self-assess, while self-efficacy and intention had significant influence on self-assessment practice. Psychological safety was also found to have relatively weak but significant impact on both self-assessment intention and practice. This study lays a foundation for future investigations on how to promote meaningful self-assessment behaviour which is crucial for self-regulated and life-long learning.  相似文献   

作者-关键词二分网络中的合著关系预测研究     

张金柱  韩涛  王小梅 《图书情报工作》2016,60(21):74-80

[目的/意义] 明晰由关键词形成的主题内容类关联关系对合著关系预测的影响和作用,形成作者-关键词二分网络上的合著关系预测指标和方法,提高预测准确率和结果可解释性。[方法/过程] 首先,在作者-关键词二分网络上抽取多种路径表示作者间的关联关系,并结合关联强度的计算方式,共同形成多种合著关系预测指标;接着应用逻辑回归的机器学习方法学习不同指标对于合著关系预测的贡献,由此构建二分网络中基于路径组合的合著关系预测指标;最后基于链路预测方法对指标进行评测。[结果/结论] 在图书情报领域的实验证实,作者-关键词二分网络中路径组合指标的准确率最高,较4种单路径指标均有大幅度提高;多种路径均对合著关系预测产生影响,且路径“作者-关键词-作者”（AKA）的作用明显高于路径“作者-关键词-作者-关键词-关键词”（AKAKA）;同时,使作者产生关联的关键词能表示作者间的共同研究主题和兴趣,使得结果更易解释。下一步将引入更多路径到该模型中并在其他领域验证方法的通用性。  相似文献   

一种高质量蜜蜂核酸的快速提取方法   总被引：7，自引：0，他引：7  

郭冬生  孙亮先  张巧利  曾志将 《泉州师范学院学报》2005,23(4):85-88

基因组DNA的提取是蜜蜂分子生物学研究的一项基本而重要的技术，但由于蜜蜂样品具有脂肪、蛋白、几丁质含量很高的特点，所以用常规方法无法获得较高质量的DNA，文章研究对蜜蜂基因组DNA的提取方法作了重要改进，可以从不同发育时期的蜜蜂中快速、大量提取高质量的蜜蜂基因组DNA，此外，对蜜蜂总RNA的提取方法也进行了探索。  相似文献   

Most Likely to Succeed: Exploring Predictor Variables for the Counselor Preparation Comprehensive Examination     

Elizabeth Kjellstrand Hartwig  James P. Van Overschelde 《Counselor Education & Supervision》2016,55(4):294-309

The authors investigated predictor variables for the Counselor Preparation Comprehensive Examination (CPCE) to examine whether academic variables, demographic variables, and test version were associated with graduate counseling students' CPCE scores. Multiple regression analyses revealed all 3 variables were statistically significant predictors of CPCE total scores and subtest scores.  相似文献   

SINGLE CELL DEGENERATE OLIGONUCLEOTIDE PRIMER-PCR AND COMPARATIVE GENOMIC HYBRIDIZATION WITH MODIFIED CONTROL REFERENCE     

金帆 《Journal of Zhejiang University. Science. B》2001,(3)

ＩＮＴＲＯＤＵＣＴＩＯＮＦｌｕｏｒｅｓｃｅｎｃｅｉｎ ｓｉｔｕｈｙｂｒｉｄｉｚａｔｉｏｎ (ＦＩＳＨ )ａｎｄｐｏｌｙｍｅｒａｓｅｃｈａｉｎｒｅａｃｔｉｏｎ (ＰＣＲ)ｈａｄｂｅｅｎｓｕｃｃｅｓｓｆｕｌｌｙｕｓｅｄｆｏｒｐｒｅｉｍｐｌａｎｔａｔｉｏｎｇｅｎｅｎｔｉｃｄｉ ａｇｎｏｓｉｓ (ＰＧＤ ) (Ｖｅｒｌｉｎｓｋｙｅｔａｌ.,1 997,Ｓａｂｔａｌｏｅｔａｌ.1 995)ａｌｔｈｏｕｇｈｔｈｅｙｎｏｒｍａｌｌｙｏｎｌｙｏｆｆｅｒｉｎｆｏｒｍａｔｉｏｎｆｒｏｍｏｎｅｏｒｆｅｗｃｈｒｏｍｏｓｏｍｅｒｅ ｇｉｏｎｓｏｒｓｐ…  相似文献   

Single cell degenerate oligonucleotide primer-PCR and comparative genomic hybridization with modified control reference     

Jin Fan  C. D. Matthews  D. N. Hussey 《浙江大学学报(A卷英文版)》2001,2(3):318-321

For investigating the possibility of applying degenerate oligonucleotide primer PCR (DOP-PCR) and comparative genomic hybridization (CGH) technique to analyses of genomic genetics in a single cell, the whole genomic DNA of a single cell with XX, XY, XO, XXY, +13 or +21 was amplified by DOP-PCR. Single cell DOP-PCR CGHs with conventional and modified control references, the genomic DNA and a single cell DOP-PCR product from normal male, were carried out respectively. The results showed that the average profile of the fluorescence intensity ratio in CGH with the genomic DNA as reference fluctuates much and that the standard deviation in about 30% haploid is beyond the normal limits. False positive hyper-representation was found to exist in X chromosome while trisomy 13 and 21 were not detected. However, the distributions of the mean and the standard deviation of the ratio in the CGH with DOP-PCR product as reference were quite acceptable. The copy number changes of chromosome X, Y, 13 and 21 were revealed. Those results suggested that there is unrandom unequal amplification in a single cell DOP-PCR. Using a single DOP-PCR product as reference can decrease its influence on CGH. Single cell DOP-PCR-CGH and its application in the genetic analyses of preimplantation embryo or fetal cell in maternal blood may be possible.  相似文献   

诸变量对篮球专项运动员心境状态预测效能的回归分析     

陈立民 《湖州师范学院学报》2011,33(2):59-63

运用回归分析统计方法,对216名(有效人数)篮球运动员进行相关问卷调查,以探测除自信心之外,与心境状态有显著统计学意义的预测变量.研究结果表明:①只有特质自信心和训练年限两个变量可以有效预测消极心境,只有特质自信心能有效预测积极心境;状态自信心、年龄、参加大赛的次数对积极心境和消极心境均无预测作用.②回归分析建立了回归方程模型、对消极心境的回归方程模型以及对积极心境的回归方程模型.  相似文献   

一种基于强化学习的在线神经模糊控制系统     

李佳宁  易建强  赵冬斌  西广成 《中国科学院研究生院学报》2005,1(5):631-638

为了实现基于非训练数据的神经模糊控制器的在线学习，提出了一种基于强化学习的神经模糊控制系统和相应的学习算法。该控制系统由神经模糊预测器和神经模糊控制器两部分组成，其中，神经模糊控制器采用基于确定度的模糊规则模型作为知识表示形式的扩展型神经模糊网络。在学习算法的设计中，尝试了利用强化信号得到输入状态的“期望输出”，进而将强化学习转化为基于训练数据学习的解决思路。仿真实验验证了所提出的控制系统结构和学习算法的合理性和可行性。  相似文献   

基于小波包与自适应预测器的音频隐写分析方法     

王昱洁  郭立  王翠平  丁治国 《中国科学院大学学报》2010,27(1):49-54

提出一种基于小波包与自适应预测器的音频隐写分析方法,主要用于检测加性噪声模型.利用加性噪声对音频高频部分比低频部分影响显著的特点,对音频信号进行小波包分解;然后利用最小均方(LMS)自适应预测器对高频小波包系数进行预测,选取预测误差的统计量作为统计特征;最后采用支持向量机分类.实验证明,对于常用的加性噪声隐写方法,即使在嵌入强度或嵌入率较低的情况下,也能达到较高的分类准确率.  相似文献   

几种苎麻园土壤微生物总DNA提取方法比较   总被引：1，自引：0，他引：1  

陈杨栋  陈婷  李力炯  曹张军  张兴群 《实验室研究与探索》2010,29(4)

实验设计对比了苎麻园土壤微生物总DNA6种提取方法。方法Ⅰ采用裂解酶、蛋白酶K、SDS与CTAB处理;方法Ⅱ结合利用CTAB、SDS、LDS和BME;方法Ⅲ综合采用玻璃珠、CTAB和SDS法;方法IV结合利用SDS-GITC-PEG;方法V利用尿素、SDS、LDS和BME综合处理;方法VI则利用试剂盒处理土壤。6种方法都可以提取到23kb左右的DNA片段,经过TENP和PVPP方法预处理的土壤样品,能有效去除腐殖酸等污染物,且提取得到的土壤总DNA完整性好、纯度高,不需要纯化就可用于PCR扩增。但不同方法取得的DNA的片段长度、产量和纯度存在明显差异。通过比较,改进并建立了可用于宏基因组构建的高纯度、大片段DNA的方法。  相似文献