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对偶法求解应力与位移约束不同显式的优化模型 被引量:2
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作者 隋允康 张立新 杜家政 《计算力学学报》 EI CAS CSCD 北大核心 2007年第5期560-564,共5页
基于响应面法,通过内力将应力约束显式化为正变量的一阶近似,位移约束采用倒变量一阶近似,建立以桁架结构重量最小为目标的截面优化模型,采用对偶规划理论转化为拟无约束模型,采用序列二次规划算法求解。此方法同应力约束零阶近似和一... 基于响应面法,通过内力将应力约束显式化为正变量的一阶近似,位移约束采用倒变量一阶近似,建立以桁架结构重量最小为目标的截面优化模型,采用对偶规划理论转化为拟无约束模型,采用序列二次规划算法求解。此方法同应力约束零阶近似和一阶近似(使用响应面方法显式化)等方法进行了算例比较,表明本文的优化模型有较好的求解效率。 展开更多
关键词 应力显式的内力处理 响应面法 对偶规划 二次规划
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A Comparative Study of the L2 Pragmatic Competence of University Students in Hong Kong and the Chinese Mainland:The Contributions of Sociocultural Context and Linguistic Proficiency
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作者 Scott AUBREY Rod ELLIS 《Chinese Journal of Applied Linguistics》 2024年第3期371-392,524,共23页
This study investigates the differences in pragmatic competence between Hong Kong and Chinese mainland university students.Participants included 19 native speakers of English,115 Chinese mainland students,divided into... This study investigates the differences in pragmatic competence between Hong Kong and Chinese mainland university students.Participants included 19 native speakers of English,115 Chinese mainland students,divided into those who had spent time abroad in an English-speaking country(CM A)and those who had not(CM NA),and 97 Hong Kong students,divided into those from an English-medium secondary school(Hong Kong EMI)and those from a Chinese-medium school(Hong Kong CMI).Linguistic proficiency was measured by a C-test,and pragmatic competence by a Metapragmatic Knowledge Test,an Irony Test and a Monologic Role Play.Group scores were compared using ANCOVAs to control for differences in proficiency.The results point to a continuum of pragmatic competence—EMI>CMI>CM A>CM NA—reflecting the groups’access to English in real-life contexts.The differences between the Hong Kong groups and the Chinese mainland groups were clearest in those tests measuring processing capacity(i.e.,Irony Response Time and the Monologic Role Play).CM A,but not CM NA,performed as well as the Hong Kong groups on measures of metapragmatic awareness.The results are discussed in terms of Bialystok’s(1993)distinction between analyzed representation and control of processing. 展开更多
关键词 pragmatic competence social context Hong Kong the Chinese mainland metapragmatic knowledge processing capacity
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谈钢筋混凝土壳板单元的配筋设计 被引量:2
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作者 马彦飞 《山西建筑》 2012年第34期61-62,共2页
针对传统的设计方法用壳单元模拟的墙、壁板忽略部分内力,计算出的钢筋量偏小的情况,提出了新的模型,并对其内力进行了处理,较好地结合现行的《混凝土结构设计规范》进行了设计,从而使壳板安全度有所提高。
关键词 模型 内力处理 配筋设计
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Improving Low Bitrate Video Coding via Computation Incorporating A Priori Information 被引量:2
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作者 Tao Xiaoming Dong Linhao +3 位作者 Li Shaoyang Li Yang Ge Ning Lu Jianhua 《China Communications》 SCIE CSCD 2015年第9期22-34,共13页
The growing number of mobile users, as well as the diversification in types of services have resulted in increasing demands for wireless network bandwidth in recent years. Although evolving transmission techniques are... The growing number of mobile users, as well as the diversification in types of services have resulted in increasing demands for wireless network bandwidth in recent years. Although evolving transmission techniques are able to enlarge the network capacity to some degree, they still cannot satisfy the requirements of mobile users. Meanwhile, following Moore's Law, the data processing capabilities of mobile user terminals are continuously improving. In this paper, we explore possible methods of trading strong computational power at wireless terminals for transmission efficiency of communications. Taking the specific scenario of wireless video conversation, we propose a model-based video coding scheme by learning the structures in multimedia contents. Benefiting from both strong computing capability and pre-learned model priors, only low-dimensional parameters need to be transmitted; and the intact multimedia contents can also be reconstructed at the receivers in real-time. Experiment results indicate that, compared to conventional video codecs, the proposed scheme significantly reduces the data rate with the aid of computational capability at wireless terminals. 展开更多
关键词 computational communications a priori information bandwidth-limited wireless communications model-based video coding
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