GPS/INS超紧致耦合压制干扰能力分析

GPS/INS超紧致耦合;GPS军码接收机;压制干扰;信号参数优化;失锁干扰功率;有效干扰范围     

On the Contagion Effect in the US Banking Sector

By using the spatial econometrics methodology, this paper investigates the contagion of the risk taking by banks in the US banking sector during 2001 to 2012. In addition, the contagion signals up to the Subprime crisis in 2008 are analyzed and different channels of contagion are studied in order to identify fragile groups of banks. Our analysis reveals that there is no significant contagion transmitted to the whole banking system. However, we observe that the bank contagion is significantly spread locally and for the group of banks that share similar characteristics related to size and bank regulations.     

督促司乘双方双重履约的博弈模型和奖惩机制

为了减少网约车平台在将订单派发给司机后司机与乘客违约的情况,有必要对司乘双方的行为进行一定约束.首先基于演化博弈理论构建网约车平台、司机和乘客的三方演化博弈模型,然后分析网约车平台、司机和乘客的演化路径及稳定策略,以及三方共同作用的演化策略的稳定性,最后通过算例仿真分析进行验证.结果显示,只有当网约车平台对司乘双方实施高强度的奖惩力度才能起到督促司乘双方选择履约策略的作用.     

On Quantile‐based Asymmetric Family of Distributions: Properties and Inference

In this paper, we provide a detailed study of a general family of asymmetric densities. In the general framework, we establish expressions for important characteristics of the distributions and discuss estimation of the parameters via method‐of‐moments as well as maximum likelihood estimation. Asymptotic normality results for the estimators are provided. The results under the general framework are then applied to some specific examples of asymmetric densities. The use of the asymmetric densities is illustrated in a real‐data analysis.     

微观经济行为的物价总水平上涨效应分析——货币政策失效与治理原理

在纸币体系中,存在"纸币的被动性膨胀"、绝对价格"向下刚性"和"向上看齐"等三个重要经济现象。因此,任何相对价格调整(变化)的微观经济行为,都会导致单向的"棘轮效应",不断震荡,促使物价总水平持续上涨。这就是纸币体系中微观经济行为的物价总水平效应,有三种具体形式。对此,紧缩性货币政策的作用不仅是有限的,而且会导致经济增长速度减缓。为了在保持物价总水平基本稳定的同时,保持经济平稳较快发展,就需要对症下药,针对这些微观经济行为采取相应的对策。     

模型剪枝与低精度量化融合的DNN模型压缩算法

拥有庞大参数量的网络模型很难部署在智能手机、可穿戴智能设备等资源受限的移动设备上。从深度神经网络模型的基本原理出发，在现有压缩算法的基础上，采用优化剪枝策略与参数量化的方法相融合，提出了一种结果导向的数据驱动剪枝算法，利用低精度的量化算法来进一步压缩模型。使用VGGNet作为原始模型，在Kaggle猫狗图像和Oxford102植物样本集上进行微调。实验数据表明，使用本实验改进的方法，模型压缩的存储容量下降到113.1 MB，识别率提高到86.74%。     

How Do Cultural Worldviews Shape Food Technology Perceptions? Evidence from a Discrete Choice Experiment

Agricultural biotechnology (genetic modification) has encountered resistance from many consumers, resulting in disparate regulatory approaches across different jurisdictions. The recent advent of CRISPR-Cas9, or gene editing, offers the potential for significant improvements in plant breeding. However, little is known currently about consumer responses to the technology. A factor often omitted from previous economic analyses of consumer acceptance of new food technologies is underlying human values or worldviews. Drawing upon cultural cognition theory and using data from a survey of Canadian consumers, we examine the influence of cultural values on food choice behaviours. Respondents’ pre-existing cultural values are measured on two dimensions: hierarchy-egalitarianism and individualism-communitarianism. Choice behaviours are captured using a discrete choice experiment featuring a sliced apple product with two consumer-oriented attributes (non-browning and antioxidant-enhanced) and three novel food technologies (gene editing, genetic modification, edible coating). Using a random parameters logit model with error components we find pre-existing cultural values to be significant determinants of choice behaviours. Individuals pre-disposed towards a hierarchical worldview are more accepting of novel food technologies, as are individuals with a communitarian worldview. While the use of gene editing results in negative marginal utilities in a food choice situation, the effect is not as large as with genetic modification, suggesting there is scope to ameliorate potentially negative reactions to the technology with value-compatible messages.     

基于改进的蚁群算法的移动机器人路径规划

针对移动机器人路径规划中的传统蚁群算法收敛精度低、易陷入局部最优等问题,提出一种改进蚁群算法。首先,对算法的转移概率进行改进,加入转向代价,减少不必要的转折,并针对启发函数启发性能不够强,对路径启发信息进行改进;然后,提出一种自适应的参数调整伪随机状态转移策略,动态改变参数值,避免过早陷入搜索停滞,增强搜索的全面性,同时对信息素更新方式进行改进,调整信息素挥发系数,保持蚂蚁发现最优路径的能力;最后,通过Matlab与其他算法进行对比分析。仿真结果表明,改进的蚁群算法收敛速度快,且路径长度和算法迭代次数有明显减少,能得到全局最优路径。改进蚁群算法具有可行性、有效性,在移动机器人路径规划中有一定的应用价值。     

基于改进精估计与FrFT的Chirp信号参数估计

为了解决Chirp信号参数估计在低信噪比下保持高精度等问题，提出了一种基于粗精二次估计的Chirp参数算法。粗估计采用分数阶傅里叶变换（Fractional Fourier Transform，FrFT），能够在低信噪比下检测到Chirp信号并估计出调频率的范围。同时，提出了一种FrFT插值算法提高FrFT估计中心频率的精度。精估计根据信号能量和周期长度一定时Chirp信号频谱幅度的平方与调频率成反比的特性，不断地用已知Chirp信号的共轭与未知Chirp信号相乘，寻找使相乘后频谱幅度平方最大的已知Chirp信号的调频率。为了提高精估计算法性能，用提出的H-Rife算法估计中心频率和相乘后信号的频谱中最大的幅值。〖JP2〗用二分法代替等步长使精估计在粗估计出的调频率范围内搜索，极大降低了复杂度。在信噪比不小于-10 dB时，该算法估计调频率归一化均方误差（Normalized Mean Square Error，NMSE）较FrFT线性提升，估计中心频率NMSE较FrFT线性提升，接近克拉美罗界。     

Comparing the temporal stability of behavioural expectation and behavioural intention in the prediction of consumers pro-environmental behaviour

Pro-environmental behaviour is a salient concern in contemporary society. However, consumers often overstate their intention to purchase pro-environment products. Prior research has focused on intentions as a predictor of actual behaviour. This study directly compares two distinct predictors of behaviour, behavioural expectation (BE) and behavioural intention (BI), to explain whether differences in the way in which consumers’ mental judgments are measured act as a barrier to understanding pro-environmental behaviour change. Findings confirm that BE has a higher temporal stability than BI, potentially accounting for the greater predictive ability of the former. One key reason for this finding is that subjects may overestimate their likelihood to act when responding to BI questions. Thus, this paper confirms that BE has a higher temporal stability than BI, and therefore, superior predictive ability. TRA/TPB researchers in particular should consider BE ahead of BI as an immediate predictor of pro-environmental and other behaviours.