软件无线电及其实现方案的研究

在介绍软件无线电的产生、基本概念和系统结构的同时，分析了实现软件无线电的关键技术，并给出了基于目前器件技术水平的中频软件无线电流程框图的折衷方案，最后指出软件无线电技术的美好前景。     

高职院校《模拟电子技术》教材编写探讨

现有的《模拟电子技术》高职高专教材中普遍存在理论偏深、实践应用内容偏少的问题。高职高专教材应以高职教育培养目标为教材建设与改革的方向,以此选择教材内容并优化其结构,通过实践环节培养创新人才,增强学生学习兴趣,培养学生的实际应用能力。     

模拟电路的故障回路和故障网孔的诊断

<正> 一、中日贸易的基本情况日本是我国对外贸易的主要市场,最大贸易伙伴之一。自1972年中日两国关系正常化,特别是1979年中国实行对内搞活经济、对外实行开放政策以来,中日贸易获得迅速发展。据     

Riding the US wave: spectrum auctions in the digital age

Given its significant technological advantages compared to analog broadcasting, digital television (DTV) will be the television system of the future. However, it requires a full replacement of analog television sets by digital receivers, as DTV can only be watched with special equipment. In order to make this transition happen smoothly without losing the analog television audience, both signals have to be simulcasted until a substantial coverage with DTV broadcasting has been achieved. Australia and the US meanwhile have established a regulatory framework to lead this transition towards the end of analog broadcasting, the so-called analog switch-off. Part of the US regime is the FCC's obligation to reassign analog frequencies after the switch-off has taken place by means of auction. Spectrum auctions, however, originate not from the US but from New Zealand, where they have been used since the end of 1989 and ever since been subject to legal and political criticism. The article outlines the principles of both the DTV and spectrum auctions regulation and shows the links between both areas of telecommunications regulation. It concludes by suggesting that the analog switch-off is a unique opportunity to reconsider current spectrum policies, as it frees large amounts of the radio spectrum that are today occupied by analog broadcasting and will soon be subject to one of the biggest frequency reassignment processes in the history of telecommunications regulation.     

高职模拟电子技术课程改革评述

通过对近年来模拟电子技术课程改革尝试的传统教学、理论与实验分离教学、教学做合一教学三种模式进行了梳理与分析,并总结了三种教学模式的优缺点,以期对高职模拟电子技术课程的改革有一定的借鉴作用。     

Risk choice and emotional experience: a multi-level comparison between active and passive decision-making

Abstract

Previous studies have consistently indicated the important role of emotional experience in decision-making. While both active and passive decision-making coexist in our daily lives, whether and how active and passive decision-making induce different emotional experience remains unclear. In the present research we conduct three studies to examine differences in emotional experience associated with active and passive decisions at multiple levels. First, at the individual level, using both active and passive modes of the Balloon Analog Risk Task in a laboratory behavior study, we demonstrate that active decision-making is associated with more positive emotional experience compared to passive decision-making, including more happiness, less distress, a greater sense of control, and a stronger sense of achievement. Second, at the neural level, we use functional magnetic resonance imaging and find greater activation in the brain’s emotional circuits during active decisions compared to passive decisions, regardless of the decision outcomes. Finally, at the population level, we conduct a large-scale survey to capture the perception of emotional experience during real-world active and passive decisions, and our results confirm that active decisions engender a greater sense of achievement and sense of control and people prefer active decisions to passive decisions. These findings provide valuable insights into the role of emotion experience in decision-making research and practices.     

大规模模拟电路的ATPG实现

要使现有的模拟电路故障诊断算法适用于大规模电网络,必须将大规模网络分解成互不耦合的小规模网络。本文讨论了将支路撕裂法用于大规模模拟电路的快速ATPG,给出了文献〔1〕中算法的五个缺陷,并对之逐一进行了解决。并在altos-68000上用FORTRAN77编制了一个可以完成200条支路,40个节点以内的任意可撕裂的线性网络的故障定位通用程序LAFDP。文中给出运用程序LAFDP进行故障定位的例子。     

Specificity of reinforcement for risk behaviors of the Balloon Analog Risk Task using math models of performance

Risky decision-making has been studied using multitrial behavioral tasks. Concordance of such tasks to risky behaviors could be improved by: (1) mathematically modeling the components of decision change and (2) providing reinforcement specific to the risk behavior studied. Men completed two Balloon Analog Risk Tasks (BART). One provided financial reinforcement (money) and the other provided sexual reinforcement (seconds of erotic film viewing). Parameters of a mathematical model of BART performance were fit to each individual. Correlations between the model parameters and four risk categories (financial, sexual, antisociality, and substance use) demonstrated predictive utility for the same behaviors regardless of task reinforcement, providing little evidence of reinforcement specificity. A reward sensitivity parameter was uniquely related to sexual risk behavior. Additional analyses explored parameter stability fit to fewer trials.     

山地-绿洲系统耦合效益模拟计算——以黑河流域为例

山地-绿洲系统耦合能够给山地和绿洲地区带来较高的经济效益，对于山地地区的环境保护和经济可持续发展有着重要的现实意义。本文结合肃南县和黑河中游绿洲地区生态经济的实际状况，分析了该地区系统耦合的现状，利用系统耦合基本原理，模拟计算了山地-绿洲系统耦合“山上繁殖，山下育肥”模式下的生态效益和经济效益，得出了系统耦合效益产生的主要原因，并结合其存在的问题，最后提出了加快系统耦合的措施。     

一种基于神经网络的模拟电路故障诊断方法

提出了一种基于模拟电路故障诊断的神经网络方法。这种方法利用小波分解、数据标准化、主成分分析对输入数据进行预处理,采用k个神经元输出的前馈神经网络结构进行有效训练。该方法检测和识别故障准确率高,系统的鲁棒性和稳定性强。