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为了测试目前流行的组合开源框架（Struts＋Spring＋Hibernate）的Web应用软件,提出了一套完整的测试解决方案,该方案充分利用目前的开源测试工具实现,实现了单元测试粒度的最小化和性能测试负载的模拟,并对一个基于该组合框架的数字化校园信息系统进行了详细的测试与性能调优,验证了该方案的有效性. 相似文献
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基于站的IEEE 802．11b／g无线局域网快速切换方案 总被引：1，自引：0，他引：1
由于实时应用对传输时延和抖动相对敏感,为减小WLAN切换过程对实时应用的影响,研究了WLAN切换过程的3个方面：触发切换,AP选择和快速切换算法．充分考虑到方案的可部署性和可扩展性,提出了一个以终端站为中心的快速切换方案．设计实现了基于动态阈值的切换触发机制、基于探寻时延的AP选择机制和信道区分选择结合动态缓存的快速切换算法．该方案完全在站上实现,不需要AP的配合或者对协议进行修改,因而具有良好的鲁棒性和可部署性．通过在实际的hotspot WLAN环境下测试和分析,该快速切换方案有效地减小了切换时延,同时使用户获得的实时应用网络性能有所增强． 相似文献
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对图像的信息隐藏技术进行了可行性分析,在此基础上介绍了使用LSB算法实现图像信息隐藏的思想,同时使用C语言对LSB算法进行了祥细实现．通过图像信息隐藏软件的实施,设计实例对该图像信息软件进行测试,说明了如何在载体图像中隐藏重要的信息以及把该信息成功提取出来的方法． 相似文献
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设计了一种基于LUC公钥密码体制的联合数字水印方案．在该方案中,各参与者用LUC公钥密码体制共同计算水印信息嵌入的位置来嵌入水印、水印执行者可验证参与者的身份,因此该方案能防止参与者的欺骗．此外,该方案还能实现水印的盲提取．实验结果表明,该方案对JPEG压缩、高斯噪声、椒盐噪声等攻击具有很好的鲁棒性． 相似文献
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给出了Turbo译码器的FPGA实现方案．译码器采用了Log．MAP译码算法和基于滑动窗的实现方法,可以对不同的Turbo码长进行译码．在Xilinx公司的Ve6vlxl30t-2ff484上验证了其实现的有效性：当码长为1434时,5次迭代,译码延迟374弘s,数据吞吐量为8．6Mbits／s．并在高斯白噪声下测试了Turbo码的误码率性能． 相似文献
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研究了基于XML的信息系统集成方法,结合实际工作,提出一种基于XML和适配器的信息系统集成方案;该方案是一种松耦合的,可方便、快速的实现信息系统集成的方案．并具体实现了该集成方案的案例． 相似文献
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一、调研背景
二、调研过程
三、体验情况
四、影响
1．学生对3D的反应。2．家长对3D的反应。3．教育成果。（接上期）4．课堂表现与注意力。所有的教师都认为3D课堂上的学生注意力更加集中。70％的教师注意到,无3D参与课堂教学部分,有46％的学生在五分钟间隔测试中的注意力集中,而在3D参与课堂教学部分,有92％的学生在五分钟间隔测试中注意力集中。 相似文献
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40 middle-class mothers and their 12-month-old infants participated in an examination of the extent to which infant sociability and infant home experiences were correlated with cognitive capacity. Results indicated that the measures of the home environment (including Caldwell's Home Observation for Measurement of the Environment [HOME] inventory) were not correlated with the measures of cognitive competence (Bayley Mental Development Index [MDI], Ordinal Scales of Psychological Development) except among firstborns. Measures of the home environment were, however, correlated with measures of infant sociability (assessed inside and outside the test situation): sociable infants had sociable mothers. The infants' reactions to strange adults clearly influenced their performance in testing situations. Strong relationships were found between both measures of sociability and both measures of cognitive competence. The sociable friendly infants received higher scores on both cognitive tests than the less sociable babies did. 相似文献
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Measurement Driven Instruction: A Closer Look 总被引：2，自引：0，他引：2
Peter W. Airasian 《Educational Measurement》1988,7(4):6-11
The author discusses conditions under which Measurement Driven Instruction might and might not produce its expected results. He considers how test stakes, Performance standards, and the nature of content assessment interrelate to influence the operation of MDI programs. In discussing instructional expectations and realities as they apply to MDI, he argues that under some conditions instruction driven by measurement measurement corrupt the measurement process. 相似文献
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Erlina Ronda Jill Adler 《International Journal of Science and Mathematics Education》2017,15(6):1097-1114
In this paper, we propose an analytic tool for describing the mathematics made available to learn in a ‘textbook lesson’. The tool is an adaptation of the Mathematics Discourse in Instruction (MDI) analytic tool that we developed to analyze what is made available to learn in teachers’ lessons. Our motivation to adapt the use of the MDI analytic framework to textbooks is to test the relative robustness of the framework in moving across different pedagogic texts (e.g. video of a lesson, a textbook lesson). Our initial findings suggest it has applicability across pedagogic texts, thus opening possibilities for using a common framework and language in research and in professional development activities involving the written and enacted curricula. 相似文献
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《Parenting, science and practice》2013,13(2):77-104
Objective. The purpose of this investigation was to explore associations between father-child interactions and children's cognitive status in an underrepresented group of low-income, ethnically diverse families. Design. Participants were 65 inner-city fathers and their 24-month-old children (34 boys, 31 girls). Father-child interactions were videotaped for 10 min at home during semistructured free play, and mental scale scores on the Bayley Scales of Infant Development were obtained on children. The quality of father-child interactions was assessed using 14 Likert ratings of fathers (e.g., responsiveness, language quality, and intrusiveness) and 12 of children (e.g., play, participation, emotional regulation, and communication). Results. Factor analyses revealed 2 patterns of engagement in fathers (Responsive-Didactic and Negative-Intrusive) and 3 in children (Playful-Communicative, Social, and Regulated). Thirty-six children scored within normal limits on the MDI and 29 scored in the delayed range. Together, fathers' and children's factor scores explained more than 25% of the variance in children's performance on the MDI. Logistic regressions indicated that fathers with high scores on the Responsive-Didactic factor were nearly 5 times more likely to have children within the normal range on the MDI than were low-scoring fathers. Conclusions. These findings point to the importance of considering fathers' role in early cognitive development, particularly in low-income families in which children begin to exhibit significant declines in their second and third years. Positive father-child interactions appear to obviate cognitive delay. 相似文献
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VAE改性聚氨酯木材胶粘剂的制备及性能研究 总被引：2，自引：0，他引：2
以4，4′-二苯基甲烷二异氰酸酯(MDI)与聚乙烯醇(PVA)胶水的交联反应为基础，制得PU乳液，并用VAE乳液对其进行改性，探讨了PCA、MDI的加入量、VAE乳液与PU乳液混合比例等因素对该胶粘剂性能的影响，制备了一种强度高、适用期长、耐水性能优良的木材用胶粘剂。 相似文献
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姜锦红 《柳州职业技术学院学报》2009,9(3):81-84
文章主要介绍MDI的光气法、非光气法各种合成工艺的进展。比较而言,尿素胺解法是原子利用率接近100％的清洁合成过程,无环境污染,可以实现零排放;并且生产过程对设备要求低,具有很好的开发应用前景。 相似文献
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Kelley SJ 《Child abuse & neglect》2003,27(9):997-1017
OBJECTIVE: To assess the relationship between cumulative environmental risks and early intervention, parenting attitudes, potential for child abuse and child development in substance abusing mothers. METHOD: We studied 161 substance-abusing women, from a randomized longitudinal study of a home based early intervention, who had custody of their children through 18 months. The intervention group received weekly home visits in the first 6 months and biweekly visits from 6 to 18 months. Parenting stress and child abuse potential were assessed at 6 and 18 months postpartum. Children's mental and motor development (Bayley MDI and PDI) and language development (REEL) were assessed at 6, 12, and 18 months postpartum. Ten maternal risk factors were assessed: maternal depression, domestic violence, nondomestic violence, family size, incarceration, no significant other in home, negative life events, psychiatric problems, homelessness, and severity of drug use. Level of risk was recoded into four categories (2 or less, 3, 4, and 5 or more), which had adequate cell sizes for repeated measures analysis. DATA ANALYSIS: Repeated measures analyses were run to examine how level of risk and group (intervention or control) were related to parenting stress, child abuse potential, and children's mental, motor and language development over time. RESULTS: Parenting stress and child abuse potential were higher for women with five risks or more compared with women who had four or fewer risks; children's mental, motor, and language development were not related to level of risk. Children in the intervention group had significantly higher scores on the PDI at 6 and 18 months (107.4 vs. 103.6 and 101.1 vs. 97.2) and had marginally better scores on the MDI at 6 and 12 months (107.7 vs. 104.2 and 103.6 vs. 100.1), compared to the control group. CONCLUSION: Compared to drug-abusing women with fewer than five risks, women with five or more risks found parenting more stressful and indicated greater inclination towards abusive and neglectful behavior, placing their infants at increased risk for poor parenting, abuse and neglect. Early home-based intervention in high-risk families may be beneficial to infant development. 相似文献
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本文通过实例详细介绍了在自动测试系统中采用 Visual Basic(VB)开发实时测控软件的方法:米用MDI窗体技术设计软件的用户界面:采用动态链接库(DLL)实现对硬件接口的控制:采肜事件驱动编程实现测试软件功能的扩展.同时对测控软件中的数字滤波、信号波形显示等技术进行了介绍. 相似文献
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This study examined the relation of information processing in 7-month-old preterms (<1750 g at birth) and full-terms to Bayley Mental Development Indexes (MDIs) at 2 and 3 years. The infant measures were drawn from four cognitive domains: attention, speed, memory, and representational competence. Structural equation modeling showed that these measures of infant information processing mediated the effects of prematurity, and that there was a cascade of effects, with infant processing speed influencing memory and representational competence, which in turn influenced later MDI. This study shows that infant information processing mediates the effect of prematurity on later cognition, and delineates pathways whereby infant abilities relate to one another and to later outcome. 相似文献
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以己二酸（AA）,1,4-丁二醇（BDO）,乙二醇（EG）分别采用一步法、二步法合成分子量为3000的聚酯PAEB-R和聚酯PAEB-A。再分别与二苯基甲烷二异氰酸酯（MDI）、扩链剂1,4-丁二醇（BDO）,乙二醇（EG）反应合成固含量30%与粘度为20000的聚氨酯PU-PAEB-R和聚氨酯PU-PAEB-A。FTIR、1H-NMR表明聚氨酯合成存在二次反应,有支链结构-NHCONCOOR-、-NHCONCONH-生成;且PAEB-A与MDI反应程度较高,游离的异氰酸酯基较少。 相似文献