基于用户协作PDMA的星地融合网络性能分析          下载免费PDF全文

王丽侠  张昆  王大维  王亚东  张海梁 《唐山学院学报》2024,37(3):25-32

将用户协作PDMA技术引入到星地融合网络下行链路系统的通信中,目的是当卫星向用户发送PDMA叠加信号时,其中最佳信道用户能够作为半双工中继节点解码和转发其他用户的信息,以提高弱用户的通信性能。文章推导出三用户处于不同程度衰落情况下系统的中断概率和遍历容量表达式,并通过仿真验证了理论分析的正确性,而且证实了与传统的正交多址接入及非协作PDMA系统相比,用户协作PDMA方案可以获得更高的中断性能和遍历容量。  相似文献   

Multiple traumas and resilience among street children in Haiti: Psychopathology of survival     

《Child abuse & neglect》2018

In Haiti, as in several developing countries, the phenomenon of street children has become a major public health issue. These children are often victims of traumas and adverse life events. This article aimed to investigate traumas experienced by street children and their coping and resilience strategies used to deal with adversities in a logic of survival, relying on a mixed method approach. A group of 176 street children, aged 7–18 (n = 21 girls), recruited in Port-au-Prince, completed measures assessing PTSD, social support and resilience. Semi-structured interviews were conducted to document traumatic experiences, factors related to resilience and coping strategies. After performing statistical analyses to evaluate prevalence and predictors associated with PTSD, and level of social support satisfaction and resilience, qualitative analysis using a grounded theory approach was conducted. Results showed that street children experienced multiple traumas such as neglect, maltreatment, psychological, physical and sexual abuse. However, they also showed self-efficacy to face their traumatic experiences and few of them (less than 15%) obtained scores reaching clinical rates of PTSD, while a large majority presented a level of resilience between moderate to very high. A socio-ecological model of multiple traumas and a model of coping, survival and resilience strategies are conceptualized. Data provide a better understanding of the traumas experienced by street children, their coping and resilience strategies. Results underscore ways to develop practices to offer psychological support, social and vocational integration based on the real needs of these children, in a perspective of social justice.  相似文献   

5G时代图书馆智慧阅读推广服务研究     

谢光雷  于兴尚  赵永林  陆康 《新世纪图书馆》2022,(1)

从5G视角出发阐释智慧阅读的演变优势和服务特点,基于5G+多元智能技术打造智慧阅读空间、阅读游戏开发、智慧阅读营销、阅读资源导航、阅读素养教育的服务体验。为完善5G模式下图书馆智慧阅读的发展格局,论文从维系阅读媒介生态、用户数据的规范与增效、融入情感交互、多样举措融合4个层面对智慧阅读的开展提出参考意见。  相似文献   

用多元智能理论设计综合实践活动课     

肇洋 《宁波广播电视大学学报》2004,2(3):65-68

本文在介绍多元智能理论以及教改新增的综合实践活动课的基础上，分析了多元智能理论与综合实践活动课的关系，并通过一个案例提出用多元智能理论设计综合实践活动课的方法。  相似文献   

巧用优势智能优化数学教学策略     

梅松竹 《唐山师范学院学报》2005,27(5):31-32,45

多元智能理论打破传统智能论调，指出入的智能的多元性。根据智能迁移规律，将其他优势智能迁移到数理逻辑智能培养过程中，为数学教学提供了一种有意义的优化策略，对于数学教学的改革具有深刻的启迪作用。  相似文献   

多目标决策评价模型在红小豆育种中的应用     

刘振兴  周桂梅  杨余 《安阳工学院学报》2008,(6)

运用基于熵权的多目标决策分析模型,结合模糊数学和熵的思想,运用多属性决策分析中的双基点法,对红小豆品种进行定量评价,结果表明,这种评价模型运算简便,易于掌握,切实可行。  相似文献   

复合输出回路性能分析     

王敦惠  邝小飞 《零陵学院学报》2001,(3)

阐述了工作于非线性状态（丙类）的谐振功率放大器阻抗匹配的概念；并论述了复合输出回路的性能特点。  相似文献   

汉英翻译中的新词新语     

唐昱 《闽江学院学报》2001,21(4):85-87

改革开放以来,我国社会发生了急剧变化,大批新词新语应运而生。面对新词新语,外语工作者有责任及时将它们译成准确、地道的外语,以便让国外读者了解今日中国的国情及发展。本文着重分析了如何才能做好汉语新词新语的英译工作,并结合实例提出几点看法。  相似文献   

模因论“翻译标准多元互补”解读   总被引：1，自引：0，他引：1  

陈鹏 《山东教育学院学报》2008,23(1):92-94

辜正坤先生提出“翻译标准多元互补”一说,引起译界争议。有疑者认为：此说会导致翻译标准的虚无主义。翻译模因论强调规范模因与竞争模因的既相互斗争又相互依存,且可相互转化的特征。本文借此给“翻译标准多元互补”予以支持,并以此佐证其正确性。  相似文献   

Students’ adaptability in mathematics: Examining self-reports and teachers’ reports and links with engagement and achievement outcomes     

《Contemporary educational psychology》2017

Adaptability refers to the capacity to adjust one’s thoughts, behaviors, and emotions in order to manage changing, new, or uncertain demands. Although preliminary research has highlighted its relevance for positive student outcomes, there remain several important empirical questions to be examined. In particular, research on adaptability has used domain-general measures (i.e., not tied to a particular domain such as a school subject) and has focused only on self-reports of adaptability (not, for example, reports by significant others). The aim of the current study was to advance knowledge of adaptability by addressing these gaps. We examined students’ domain-specific adaptability in mathematics as reported by students themselves and by their mathematics teachers (n = 371). We examined the extent to which the two reports of mathematics adaptability are associated with students’ mathematics engagement, mathematics achievement, and literacy achievement (the latter a test of discriminant validity). Well-known covariates were included as controls (e.g., gender, prior achievement). Results revealed that student-reported adaptability predicted students’ mathematics engagement. Moreover, student-reported and teacher-reported adaptability uniquely predicted mathematics achievement. In terms of discriminant validity, (mathematics-based) student and teacher reports of adaptability were not associated with students’ literacy achievement. Together, findings advance knowledge of the adaptability construct, including providing preliminary evidence of domain-specificity and the complementary nature of self- and teacher-reports for assessing adaptability. Implications for practice are discussed.  相似文献