共查询到20条相似文献，搜索用时 468 毫秒
1.
分析了在测试用例优先级问题中被广泛用于度量测试用例集错误检测效率的APFD度量标准及其变种,指出APFD系列度量标准存在物理意义模糊、对错误检测过程描述不清晰等缺陷.针对这些缺陷对已有度量标准进行改进,提出2种新的测试用例集错误检测效率度量方法 relative-APFD和relative-APFDC.新的度量方法在评价测试用例集效率时,综合考虑了错误检测速度和测试资源约束问题.实例分析表明,新方法可以更为清晰地描述测试用例集错误检测过程,并更为准确地反映不同测试用例集的错误检测效率. 相似文献
2.
周中兴 《乌鲁木齐职业大学学报》2008,17(2):126-128
在普通话水平第一、二题测试中.出现了一些语音错误背离了测试目标,试卷设计时想要测到的音节无法测得的现象.针对这一现象,本文通过对普通话水平测试理论与实践中一些问题的重新梳理,提出了普通话语音测试中"目标无关性错误"的概念.并在此基础上指出,教育测量理论中有关信度、效度的检测用于普通话语音测试研究时,要从测题与目标一致性的角度出发,充分考虑汉字特性的影响. 相似文献
3.
钟九洲 《重庆职业技术学院学报》2011,20(6)
在总结传统检测DoS攻击系统的优势和劣势的基础上,结合Linux系统的特点设计出基于Linux平台的DoS攻击检测系统.本系统中的网络安全模块可以迅速地检测出网内基于DoS的攻击状态,行为控制模块可以控制网内用户对可疑网站的浏览、连接,网络日志模块可以自动记录网内用户使用网络的实际情况.经过测试,本系统可以有效地检测出DoS攻击,同时还可以对用户浏览行为进行控制并查看网络使用情况. 相似文献
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为了提高web应用回归测试的效率,采用了控制流图和贪心算法.以页面为基本单位,通过构造web应用的控制流图,提出了一种基于控制流图的web应用回归测试的测试用例选择方法,该方法是一种安全的测试用例选择方法.在web应用回归测试的测试用例执行中,根据web应用中请求序列的特点,采用了最小化技术并考虑测试用例的优先级,提出了一种改进的贪心算法对测试执行进行了优化.实验结果表明,该方法有效地减少了需要重测的用例数并且提高了测试执行的效率. 相似文献
6.
MPEG-2纹理图像的错误检测技术 总被引：1，自引：0，他引：1
曹继华 《天津工程师范学院学报》2006,16(3):5-8
基于MPEG-2码流，描述了传送流（TS）和视频流的错误检测方法。这两种错误分别由信道解码器和视频解码器识别，通常检测到的是语法错误，而且由于可变字长码的错误传播影响，检测到的错误位置并非错误的起始位置。因此，基于图像光滑性和一致性的假设，提出了非语法错误的纹理图像的检测算法（如DC系数的错误检测算法）以及确定错误起始位置的方法。实验结果表明，该技术能够应用于MPEG-2解码器的实时处理。 相似文献
7.
误用检测是当前大多数入侵检测系统都采用的检测方法,它虽然对入侵的检测成效显著,但对一些潜在的入侵行为,无能为力.本文提出了一种新的入侵检测方案,它通过捕获动态的、潜在控制流和数据流,建立主体和对象之间的关系并进行分析,从而判断出潜在入侵行为.讨论了该方案的系统状态和状态转化规则,并通过一个实例证实了它在网络检测中的有效性. 相似文献
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钟九洲 《重庆职业技术学院学报》2011,(5):158-160
在总结传统检测DoS攻击系统的优势和劣势的基础上,结合Linux系统的特点设计出基于Linux平台的DoS攻击检测系统。本系统中的网络安全模块可以迅速地检测出网内基于DoS的攻击状态,行为控制模块可以控制网内用户对可疑网站的浏览、连接,网络日志模块可以自动记录网内用户使用网络的实际情况。经过测试,本系统可以有效地检测出DoS攻击,同时还可以对用户浏览行为进行控制并查看网络使用情况。 相似文献
10.
英语学习者口语中的音段错误分析 总被引：1，自引：0，他引：1
程春梅 《广西教育学院学报》2006,49(1):111-112
本研究使用两个已作语音错误标注的中国大学生口语语料库,对其中的音段错误进行了研究.结果表明,中国英语学习者在自然语流中的音段出错频率为2.1%;音段的替换型错误的出错频率远远高于脱落型错误和添加型错误的出错频率.对比元音错误和辅音错误,元音错误主要集中在三个松元音上,而辅音错误主要集中在爆破音和摩擦音上. 相似文献
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相较于传统单点传感器检测火灾的方法,采用视频检测火灾更快、更可靠,而且可以提供火灾大小、增速等直观的图像信息。结合图像处理技术,设计一种可以同时检测火焰和烟雾的视频火灾检测方法。首先,通过提取移动区域的方式,并利用改进的火灾颜色模型提取出疑似火灾区域;然后,选出抗干扰能力强的火灾特征并对提取各特征的方法进行设计;最后,将火焰特征输入支持向量机进行火焰判别,将烟雾各特征与阈值比较后的结果输入可调节检测灵敏度的逻辑运算器进行烟雾判别,结合火焰与烟雾判别结果决定是否进行火灾预警。大量实验结果表明,该方法不仅可以检测明火,而且可以检测阴燃火,在检测准确率、误报率及反应时间上都有更好的表现。 相似文献
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基于MEMS和GSM模块远程监护的实验和研究 总被引：1，自引：0，他引：1
提出了基于MEMS和GSM短信沟通平台的检测人体跌倒、自动发送手机短信报警以及紧急呼救的智能监护系统,以实现对居家老人的远程监护和突发意外的及时警报。系统由三大模块组成,其中采集模块、通讯模块和控制模块分别为SIEMENS TC35模块和MMA7260QT加速度传感器以及低功耗单片机STC12LE5204AD,采用AT指令程序实现单片机控制GSM模块自动发送跌倒求救短信。该系统较一般检测算法不同:对人体进行动静态姿势分类,自动检测是否进入省电模式并启用随时唤醒机制;预设的紧急报警按钮使用户能够及时自主求救。实验证明,基于MEMS和GSM的老人监护系统能够及时有效地对居家老人进行可靠监护,对保障老人生命安全具有重要应用意义。 相似文献
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误码率是数据传输设备的衡量指标之一,误码率测试是SFP光通信模块生产与设计中重要的环节。针对SFP光通信模块设计了一种基于FPGA的误码率测试系统,系统采用并行m型伪随机序列编码,可实现PRBS-7至PRBS-31标准的m序列码流生成,与SFP光通信模块的通信速率为1.25Gbps。系统打破常规测试的局限性,模块连接简便,可以在短时间内对SFP光通信模块进行准确测试,提高了SFP光通信模块误码率测试的效率。 相似文献
14.
Improving Person-Fit Assessment by Correcting the Ability Estimate and Its Reference Distribution 总被引：1，自引：0，他引：1
The standardized log-likelihood of a response vector (lz ) is a popular IRT-based person-fit test statistic for identifying model-misfitting response patterns. Traditional use of lz is overly conservative in detecting aberrance due to its incorrect assumption regarding its theoretical null distribution. This study proposes a method for improving the accuracy of person-fit analysis using lz which takes into account test unreliability when estimating the ability and constructs the distribution for each lz through resampling methods. The Type I error and power (or detection rate) of the proposed method were examined at different test lengths, ability levels, and nominal α levels along with other methods, and power to detect three types of aberrance—cheating, lack of motivation, and speeding—was considered. Results indicate that the proposed method is a viable and promising approach. It has Type I error rates close to the nominal value for most ability levels and reasonably good power. 相似文献
15.
Avi Allalouf 《Educational Measurement》2007,26(1):36-46
There is significant potential for error in long production processes that consist of sequential stages, each of which is heavily dependent on the previous stage, such as the SER (Scoring, Equating, and Reporting) process. Quality control procedures are required in order to monitor this process and to reduce the number of mistakes to a minimum. In the context of this module, quality control is a formal systematic process designed to ensure that expected quality standards are achieved during scoring, equating, and reporting of test scores. The module divides the SER process into 11 steps. For each step, possible mistakes that might occur are listed, followed by examples and quality control procedures for avoiding, detecting, or dealing with these mistakes. Most of the listed quality control procedures are also relevant for Internet-delivered and scored testing. Lessons from other industries are also discussed. The motto of this module is: There is a reason for every mistake. If you can identify the mistake, you can identify the reason it happened and prevent it from recurring. 相似文献
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In cognitive diagnostic models (CDMs), a set of fine-grained attributes is required to characterize complex problem solving and provide detailed diagnostic information about an examinee. However, it is challenging to ensure reliable estimation and control computational complexity when The test aims to identify the examinee's attribute profile in a large-scale map of attributes. To address this problem, this study proposes a cognitive diagnostic multistage testing by partitioning hierarchically structured attributes (CD-MST-PH) as a multistage testing for CDM. In CD-MST-PH, multiple testlets can be constructed based on separate attribute groups before testing occurs, which retains the advantages of multistage testing over fully adaptive testing or the on-the-fly approach. Moreover, testlets are offered sequentially and adaptively, thus improving test accuracy and efficiency. An item information measure is proposed to compute the discrimination power of an item for each attribute, and a module assembly method is presented to construct modules anchored at each separate attribute group. Several module selection indices for CD-MST-PH are also proposed by modifying the item selection indices used in cognitive diagnostic computerized adaptive testing. The results of simulation study show that CD-MST-PH can improve test accuracy and efficiency relative to the conventional test without adaptive stages. 相似文献
17.
Tim Moses 《Educational Measurement》2014,33(2):29-40
This module describes and extends X‐to‐Y regression measures that have been proposed for use in the assessment of X‐to‐Y scaling and equating results. Measures are developed that are similar to those based on prediction error in regression analyses but that are directly suited to interests in scaling and equating evaluations. The regression and scaling function measures are compared in terms of their uncertainty reductions, error variances, and the contribution of true score and measurement error variances to the total error variances. The measures are also demonstrated as applied to an assessment of scaling results for a math test and a reading test. The results of these analyses illustrate the similarity of the regression and scaling measures for scaling situations when the tests have a correlation of at least .80, and also show the extent to which the measures can be adequate summaries of nonlinear regression and nonlinear scaling functions, and of heteroskedastic errors. After reading this module, readers will have a comprehensive understanding of the purposes, uses, and differences of regression and scaling functions. 相似文献
18.
檀甫贵邹复民刘丽桑李建兴 《福建工程学院学报》2020,(3):267-272
针对软包锂电池表面缺陷检测,基于机器视觉技术提出了一种改进的自动检测方法。 对图像进行预处理后,将Canny 算子检测法和Close_Edges 算子检测法相结合,分割出软包锂电池表面的缺陷?最后以最小外接矩形法计算出划痕的长度和宽度,以累加法计算出针孔的直径。 实验结果表明该方法能够有效分割出软包锂电池表面的划痕和针孔,缺陷尺寸计算的误差低于5%。 相似文献
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An intelligent detecting system based on wireless transmission is designed. Its hardware includes the card reading module, the wireless digital transmission module, the LCD module, the random password keyboard module and a 16×16 lattice word database based on e-Flash MM36SB020. Its software is a communication protocol between the central control computer and the entrance management base station. To resolve the conflicting problems occurred during the data transmission, a method of delaying time at random is proposed. 相似文献
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Avi Allalouf 《湖北招生考试》2008,(16)
从评分、等值到成绩报告的过程中,各环节相互依赖和影响,其评价结果极易出现错误。为了监控这一评价过程并尽可能减少犯错数量,需要制定一套质量监控程序。所谓质量监控即指用来确保评分、等值和分数报告过程中达到预期质量标准的一个正规的系统化过程。评分-等值-分数报告过程可分为11个环节,在很多情况下,质量检查都可以在最终产品上进行。 相似文献