一种MIMO-WLAN的跨层速率控制方案

针对下一代无线局域网高速率演进的要求,该文提出一种跨层的多输入多输出(MIMO)系统速率控制算法。首先分析了保证业务误码率的物理层吞吐率最大的速率控制算法存在的不足;然后结合自适应调制编码技术,实现了基于预测的MAC(Media Access Control)层吞吐率最大的跨层速率控制算法。仿真和分析表明算法可以取得近似优化的速率选择结果,能够保证业务的误码率性能,提高业务的吞吐率。该文的算法计算简单、预测准确、运行高效,不仅可以实现闭环速率控制,还可用于帧重传和多业务调度等应用的速率控制。     

CAN总线共享时钟调度算法的应用与改进

控制器局域网（CAN）协议被广泛运用在分布式嵌入式系统中,研究表明共享时钟调度算法能有效的将基于CAN的微控制器与时间触发网络结构结合起来。文章指出了共享时钟调度算法存在的一些不足,并且提出一种改进的共享时钟调度算法,通过构建一个实际系统验证了两种算法在CAN通信中的性能,结果显示改进的共享时钟调度算法是对原算法的一种有效补充。     

基于C8051F040单片机与CAN总线的某自跟踪雷达系统控制电路的研制

关键词:本文主要简单介绍了某自跟踪雷接收子系统内部所要求的工作控制关系、流程,及其C8051F040单片机在本控制方案中的使用情况,对其性能指标进行了简单的分析.     

新型小板状天线覆盖地下车库方案研究

本文主要研究了新型小板状天线对于地下车库的覆盖,从电磁辐射、覆盖效果、信号外泄、投资情况等方面分析,并与传统的吸顶天线覆盖方式进行综合对比,发现新型小板状天线覆盖地下车库的方式具有覆盖效果好、辐射与外泄可控、方便施工及维护、投资较低等特点,从而总结得出相关推广设计规范及应用注意事项。     

基于双转子发电机的风光互补发电系统优化策略研究

本文为了研究提高风光互补发电系统的效率,引入了双转子发电机结构,有效提高了发电效率和电力输出的稳定性。以期为国内风光混合发电系统优化问题的合理解决提供参考。     

Examining the factors that influence early adopters’ smartphone adoption: The case of college students

The influence of early adopters on potential adopters’ decisions of whether or not to adopt a product is known to be critical. In this paper, we examine the factors that influence the adoption behavior of smartphone early adopters by looking at smartphone adoption behavior of college students, because a large portion of the early adopters of smartphones are college students. Our focus is on the effect of normative peer influence on a college student’s smartphone adoption. We also examine the influence of other factors such as self-innovativeness, self-efficacy, the decision maker’s attitudes towards a product, financial burden of using the product, familial influence, and other demographic factors (e.g., age and gender). College students’ adoption behavior is studied using logit and probit choice models developed based on random utility theory. The discrete choice models are empirically estimated using survey data. We find important influence of friends, financial burden, and other family members on the smartphone adoption of college students who adopted smartphones earlier than other students.     

用于130nm/90nm新工艺开发的铜CMP阻挡层磨料系统(英文)

通过与实验室的CMP和集成工程师合作,采用测试系统观察两种或两种以上混合配方磨料的选择比。实验数据表明,通过改变单个化学试剂组分的浓度改变磨料的选择比效果突出,磨料配方师可以简便地修改磨料配方。这种方法的优点是,如果改变集成方法或特殊膜层,可以很快地重新优化磨料。如SiN膜取代TEOW淀积氧化物膜,对新系统可以容易地重新优化磨料。介绍了几种磨料组分浓度的去除速率和选择比。     

Graph-theoretic algorithm for spectrum allocation in IEEE 802.22 wireless mesh network

The IEEE 802.22 standard based on wireless Cognitive Radio (CR) is an optimal solution to resolve the inefficient spectrum utility problem. In this paper, we focus on the spectrum allocation in IEEE 802.22 mesh networks and propose a new graph-theory algorithm. The algorithm aims at two objectives: one is the sum of the allocated channel bandwidth is maximum, and the other is the number of users can be active simultaneity is maximum. In this proposed algorithm, the topology of network was modeled as a general graph and could be transformed into a weighted complete bipartite-graph by three processes. The simulations show that the presented algorithm can improve the performance of spectrum allocation.     

无线局域网设备天线性能测试

由于无线局域网设备为同频时分设备,其上下行链路共用同一频率,因此传统的异频双工设备天线性能测试方法对其不适用。本文介绍了无线局域网设备天线性能的测试标准,给出了被测终端的设置要求,介绍了适用于无线局域网设备的天线性能测试方法。该方法符合标准要求,且测试精度高,不确定度低。     

The gift of authoritarian experience: The determinants of online political efficacy in new democracies

This paper represents an effort to investigate the impact of perceived new media credibility on citizens’ online political efficacy (OPE) in new democracies. Unlike their counterparts in mature democracies and outright authoritarian states, citizens of new democracies face the challenge to reconcile their democratic present with the authoritarian past. Their online political behaviors therefore are likely to be shaped by the interaction between democratic realities and authoritarian legacies or memories. The current study argues that in new democracies, the relationship between credibility of new media and OPE is contingent upon citizens’ authoritarian experience. Since authoritarian experience delivers a sense of relative acquisition through a comparison mechanism, it is expected to play a positive role in moderating the association between credibility of new media and OPE. We test the proposition by studying a sample of Taiwanese residents interviewed during the 2015 Taiwan Communication Survey (TCS). Our empirical analyses produce strong supportive evidence for the positive conditioning effect of authoritarian experience and the result is robust to different model specifications and alternative measures of authoritarian experience.