一种适用于强脉冲噪声下的对数型恒模盲均衡算法

针对脉冲噪声下恒模算法(Constant Modulus Algorithm,CMA)失败的问题，通过分析脉冲噪声的影响，提出了一种基于最小均方（Least Mean Square,LMS）准则的对数型恒模算法（Logarithmic-type CMA,LT-CMA）。LT-CMA利用对数函数的非线性变换特性自适应地抑制强脉冲噪声对误差函数的影响，并且利用l2-范数进行信号归一化处理以增强算法的稳健性。仿真结果表明，所提出的LT-CMA可以适应于高斯噪声环境和脉冲噪声环境；与经典自适应均衡算法相比，在收敛速度和稳健性两方面上，所提出的LT-CMA都有显著的提升。     

On the need to compensate the compensating variation in CGE modeling

The message of this research is that in the standard calibrated setting of Computational General Equilibrium (CGE) models, the welfare measures typically used to compare benchmark with counterfactuals are numéraire dependent. This evaluation bias affects the compensating variation and the Konüs index of cost of living. We show that the equivalent variation is neutral regarding the choice of value units in calibrated models but would be affected as well in uncalibrated CGE models. We illustrate with a simple example and propose an even simpler theoretical solution to overcome these biases; all that is required to have correct welfare estimates is to compensate normalizing with a suitable price index. This type of correction is necessary to overcome the sometimes blind implementation of welfare measures in numerical general equilibrium analysis. We show that the induced quantitative errors may be substantial providing biased welfare estimates and misleading results.     

单频网多播系统中的开环半动态功率分配算法

在单频网多播传输中，传统的全反馈动态功率分配数算法需要根据每个时隙反馈的用户瞬时信道信息进行实时的调整，所以造成了资源分配频率快、上行反馈开销大的缺点。为了克服这个缺点，提出了一个低复杂度、没有用户反馈的单频网多播开环半动态功率分配算法。首先在各小区等功率分配的假设下，根据单频网的形状信息算出各小区等价信道增益，然后再根据这个增益值，实现满足速率需求情况下的各小区功率分配。仿真结果显示，与全反馈的动态功率分配算法相比，该算法以一小部分性能损失为代价，大大减少了单频网的上行反馈和资源分配的开销，因此更适用于实际的单频网多播系统。     

Fuel consumption for various driving styles in conventional and hybrid electric vehicles: Integrating driving cycle predictions with fuel consumption optimization*

Improving fuel economy and lowering emissions are key societal goals. Standard driving cycles, pre-designed by the US Environmental Protection Agency (EPA), have long been used to estimate vehicle fuel economy in laboratory-controlled conditions. They have also been used to test and tune different energy management strategies for hybrid electric vehicles (HEVs). This paper aims to estimate fuel consumption for a conventional vehicle and a HEV using personalized driving cycles extracted from real-world data to study the effects of different driving styles and vehicle types on fuel consumption when compared to the estimates based on standard driving cycles. To do this, we extracted driving cycles for conventional vehicles and HEVs from a large-scale U.S. survey that contains real-world GPS-based driving records. Next, the driving cycles were assigned to one of three categories: volatile, normal, or calm. Then, the driving cycles were used along with a driver-vehicle simulation that captures driver decisions (vehicle speed during a trip), powertrain, and vehicle dynamics to estimate fuel consumption for conventional vehicles and HEVs with power-split powertrain. To further optimize fuel consumption for HEVs, the Equivalent Consumption Minimization Strategy (ECMS) is applied. The results show that depending on the driving style and the driving scenario, conventional vehicle fuel consumption can vary widely compared with standard EPA driving cycles. Specifically, conventional vehicle fuel consumption was 13% lower in calm urban driving, but almost 34% higher for volatile highway driving compared with standard EPA driving cycles. Interestingly, when a driving cycle is predicted based on the application of case-based reasoning and used to tune the power distribution in a hybrid electric vehicle, its fuel consumption can be reduced by up to 12% in urban driving. Implications and limitations of the findings are discussed.     

氨纶纤维的生产技术及发展趋势

本文概述了氨纶纤维的用途、生产方法和生产工艺，对氨纶纤维技术发展趋势、国内外氨纶纤维现况进行了分析，并着重对熔纺氨纶丝进行了介绍，对国内氨纶纤维的发展及外资企业抢滩中国氨纶市场的现象提出建议。     

底部大空间配筋砌块砌体剪力墙结构的抗震分析

本文简单介绍了底部大空间配筋砌块砌体剪力墙结构抗震设计的一般要求,并结合工程实例,对比分析了底部大空间配筋砌块砌体剪力墙结构与底部大空间钢筋混凝土剪力墙结构在一维与多维地震作用下的结构反应,以便为以后设计提供必要的参考。     

预应力梁高强、超早强混凝土的配制技术

本文介绍了水泥掺减水剂、减水剂和水泥双掺粉煤灰与减水剂和水泥双掺磨细矿碴的三个配合比设计方案,比较了52.5MPa水泥和42.5MPa的配制效果,同时也比较了各种掺合料在不同掺量时的配制强度,配制出了3天达设计等级强度90%,可同时满足预制梁和连续梁施工技术要求的高强、超早强预应力混凝土配合比设计方案。     

Beyond Income and Wealth

This paper proposes four criteria for the selection of a better measure of living standards: it should be comprehensive, correlation sensitive, preference based, and fairness based. These criteria are applied to the following measures: income, equivalent income, capabilities, and satisfaction. The paper then explores the relationship between the space of goods and services, the space of budgets, and the more fundamental space of the aspects of life that people really care about. The importance of the fairness principles guiding interpersonal comparisons is highlighted.     

Selection of influential variables in ordinal data with preponderance of zeros

Presence of excess zero in ordinal data is pervasive in areas like medical and social sciences. Unfortunately, analysis of such kind of data has so far hardly been looked into, perhaps for the reason that the underlying model that fits such data, is not a generalized linear model. Obviously some methodological developments and intensive computations are required. The current investigation is concerned with the selection of variables in such models. In many occasions where the number of predictors is quite large and some of them are not useful, the maximum likelihood approach is not the automatic choice. As, apart from the messy calculations involved, this approach fails to provide efficient estimates of the underlying parameters. The proposed penalized approach includes ?₁ penalty (LASSO) and the mixture of ?₁ and ?₂ penalties (elastic net). We propose a coordinate descent algorithm to fit a wide class of ordinal regression models and select useful variables appearing in both the ordinal regression and the logistic regression based mixing component. A rigorous discussion on the selection of predictors has been made through a simulation study. The proposed method is illustrated by analyzing the severity of driver injury from Michigan upper peninsula road accidents.     

新建大同至西安铁路工程皂角大桥连续梁线形控制

本文介绍了皂角大桥(32+48+32m)预应力混凝土连续梁的施工控制情况,提出了一个推算挂蓝弹性变形的简单公式,对控制线性的修缮作出了新的尝试。