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线型数据通道高层综合的运算单元优化分配算法
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作者 欧钢 雍少为 王飞雪 《国防科技大学学报》 EI CAS CSCD 北大核心 2003年第1期56-60,共5页
运算单元分配是高层综合的关键算法之一。采用了一种面向数字信号处理应用、规则的线型数据通道模型,其中心思想是全局互联的最小化。以最小着色算法构造的一个初始分配为起点,采用随机进化算法对其进行迭代改善,以减小数据寄存器数和... 运算单元分配是高层综合的关键算法之一。采用了一种面向数字信号处理应用、规则的线型数据通道模型,其中心思想是全局互联的最小化。以最小着色算法构造的一个初始分配为起点,采用随机进化算法对其进行迭代改善,以减小数据寄存器数和运算单元之间的数据交换。最后还给出了典型实例的实验结果。 展开更多
关键词 高层综合 组合优化 运算单元优化分配算法 线型数据通道 数字信号处理
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两种渐扩渐缩通道内层流传热特性的比较 被引量:4
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作者 张东升 王秋旺 陶文铨 《上海理工大学学报》 CAS 北大核心 2001年第3期252-254,共3页
利用贴体坐标系计算了等壁温工况下水在线型及波纹型渐扩渐缩通道内周期性充分发展的对流换热特性. 两种通道进口高度相同,沿流动方向截面积相等. 在相同质量流量、相同压力降和相同泵功率等条件下,比较了两种通道的换热特性. 计算结果... 利用贴体坐标系计算了等壁温工况下水在线型及波纹型渐扩渐缩通道内周期性充分发展的对流换热特性. 两种通道进口高度相同,沿流动方向截面积相等. 在相同质量流量、相同压力降和相同泵功率等条件下,比较了两种通道的换热特性. 计算结果表明,在相同质量流量与相同泵功率条件下,波纹型通道的换热特性优于线型通道,而在相同压力降情况下波纹型通道不如线型通道. 展开更多
关键词 充分发展对流换热 线型通道 波纹型通道 贴体坐标系
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Polarization Projection for 3D Geometry-Based Stochastic Channel Model
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作者 PANG Lihua ZHANG Yang +5 位作者 GONG Fengkui WANG Anyi XIAO Liyuan LIANG Xiao WANG Qiaofeng LI Jiandong 《China Communications》 SCIE CSCD 2015年第10期52-63,共12页
Comprehensive radiation characteristics of polarized antenna are crucial in creating practical channel coefficients for next generation wireless communication system designs.Being currently supported within3 D geometr... Comprehensive radiation characteristics of polarized antenna are crucial in creating practical channel coefficients for next generation wireless communication system designs.Being currently supported within3 D geometry-based stochastic channel models(GSCM),field patterns are technically obtained by chamber measurement(or by its best fitting).However,in some channel related performance analysis scenarios,design insight can be crystallized better by starting the derivations with theoretical co-polarization and cross-polarization components.Specifically,these two components are mathematically linked with field patterns through the proposed polarization projection algorithm.In this manuscript,we focus on revealing the transformation criterion of polarization states between the antenna plane and the propagation plane.In practice,it makes retrieving the field patterns by electromagnetic computation possible.Meanwhile,the impact imposed by distinct antenna orientations is geometrically illustrated and consequently incorporated into the proposed algorithm.This will further facilitate flexible performance evaluation of related radio transmission technologies.Our conclusions are verified by the closed-form expression of the dipole field pattern(via an analytical approach) and by chamber measurement results.Moreover,we find that its 2D degenerative case is aligned with the definitions in 3^(rd) generation partnership project(3GPP)technical report 25.996.The most obvious benefit of the proposed algorithm is to significantly reduce the cost on generating channel coefficients in GSCM simulation. 展开更多
关键词 polarization 3D geometry-based stochastic channel model antenna orientation radiation characteristics dipole chamber measurement channel simulation
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O2O's construction based on the research of Business model with integration of online and offiine channel
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作者 Qiaoyu Wang 《International English Education Research》 2014年第6期36-39,共4页
With the rapid development of information technology, it appears that a single online channel or a single offline is not able to meet the consumers' shopping needs, the enterprises will have a better development only... With the rapid development of information technology, it appears that a single online channel or a single offline is not able to meet the consumers' shopping needs, the enterprises will have a better development only by making the online and offline channels be in fusion and promote each other. This paper will combine the general business modes with corporate channel integration pattern, build out different forms of the market mode including market, enterprise and customers basing on different influence level, and analyze out the enterprise how to implement the business mode of integration basing on the influence factors under the background of different business modes, then apply the corresponding O2O process to the mode, so as to broaden the enterprise selling channels for a better development. 展开更多
关键词 Business mode Online and offiine Integration of channels O2O mode
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O2O's construction based on the research of Business model with integration of online and offiine channel
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作者 Qiaoyu Wang 《International English Education Research》 2014年第7期61-64,共4页
With the rapid development of information technology, it appears that a single online channel or a single offline is not able to meet the consumers' shopping needs, the enterprises will have a better development only... With the rapid development of information technology, it appears that a single online channel or a single offline is not able to meet the consumers' shopping needs, the enterprises will have a better development only by making the online and offline channels be in fusion and promote each other. This paper will combine the general business modes with corporate channel integration pattern, build out different forms of the market mode including market, enterprise and customers basing on different influence level, and analyze out the enterprise how to implement the business mode of integration basing on the influence factors under the background of different business modes, then apply the corresponding O2O process to the mode, so as to broaden the enterprise selling channels for a better development. 展开更多
关键词 Business mode Online and offline Integration of channels O2O mode
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Performance analysis of wireless local area networks(WLAN) in a coal-mine tunnel environment
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作者 ZHU Changping DENG Xingsong +4 位作者 ZHU Jia LI Lei ZENG Xiaoyang YU Hongzhen ZHANG Shen 《Mining Science and Technology》 EI CAS 2010年第4期629-634,共6页
In order to establish an effective wireless communication system in an underground coal-mine environment, the propagation of radio waves through a rectangular-like mine tunnel was investigated by jointly, considering ... In order to establish an effective wireless communication system in an underground coal-mine environment, the propagation of radio waves through a rectangular-like mine tunnel was investigated by jointly, considering both the dielectric constant and the reflectance of a mine tunnel. By combining free space and modified waveguide propagation models, we propose a new hybrid propagation model based on ray tracing. Simulation results have shown the effectiveness of establishing a wireless Local Area Network (LAN) in this coal-mine environment. The results of this research will be very useful as a guide in the design and development of tunnel wireless LAN systems. 展开更多
关键词 mine tunnel hybrid propagation model wireless LAN
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