适于DSP的模拟信号调制方式自动识别方法研究

提出一种适用于DSP的基于Bessel插值结构的正交数字下变频方案，可实现已调信号调制方式的自动识别。该方案能够实现提取信号的正交分量和同相分量，并且能够提取出较高精度的信号的基本参数，由此得到的特征参数可以准确地识别出信号的调制模式。最后，通过计算机和DSP仿真，证明了它的可行性。     

借鉴国际经验打造我国世界级首都经济圈

国际首都经济圈均先经历极化效应后实现扩散效应,最终在一定区域内形成首都圈经济,通常由服务经济、总部经济、知识经济、绿色经济、园区经济、临轨经济、临空经济和临港经济等八大经济形态组成。通过深入研究伦敦、巴黎、东京和首尔四大国际性首都经济圈的演化路径及经验,定性与定量相结合比较八大经济形态发展态势,明确北京首都经济圈发展差距,提出实现首都经济结构发展升级必须依赖推动京津冀协同发展,建立全域性的首都圈经济。     

依赖中的资源争夺:中小学生减负的困境及出路

中小学生减负问题是新中国成立以来，我国教育发展过程中力图解决但却难以根治的历史性问题。依赖中的资源争夺所引发的校际与校内关系的复杂存在，影响了减负工作的深入推进，成为中小学生减负路上的主要拦路虎。突破减负困境，可通过推动基础教育从传统静态、集中走向现代动态、均衡发展，确保义务教育阶段公办教育的公共服务能力，重新思考民办与公办教育的关系及功能定位，形成多元主体参与和共建共享的现代教育治理体系，构建低竞争、低控制、真评价的教育生态环境等举措合力助推。希望以此为我国中小学生减负工作的有效开展提供行动借鉴和理论参考。     

From the Digital Divide to the Connectivity Dividend Difference: A Connectivity Capital Perspective*

The access divide was once the basic form of the digital divide. The development of Internet infrastructure has narrowed the access divide and increased application coverage, but it has also touched off a connectivity dividend difference. Taking the online market as an example, we examine the sources of the dividend difference and the factors influencing it with in a connectivity framework. We found that the narrowing of the access divide has resulted in enhanced connectivity and platform development, giving people the chance to benefit from transforming the various assets in which they have previously invested into differentiated compound connectivity capital. In the course, the scale and rate of the conversion are affected by two multiplier effects and especially by online platforms. The process is ultimately expressed in the dividend difference.     

基于fused惩罚的稀疏主成分分析

本文旨在研究基于fused惩罚的稀疏主成分分析方法，以适用于相邻变量之间高度相关甚至完全相等的数据情形。首先，从回归分析角度出发，提出一种求解稀疏主成分的简便思路，给出一种广义的稀疏主成分模型—— GSPCA模型及其求解算法，并证明在惩罚函数取1-范数时，该模型与现有的稀疏主成分模型——SPC模型的求解结果一致。其次，本文提出将fused惩罚与主成分分析相结合，得到一种fused稀疏主成分分析方法，并从惩罚性矩阵分解和回归分析两个角度，给出两种模型形式。在理论上证明了两种模型的求解结果是一致的，故将其统称为FSPCA模型。模拟实验显示，FSPCA模型在处理相邻变量之间高度相关甚至完全相等的数据集上的表现良好。最后，将FSPCA模型应用于手写数字识别，发现与SPC模型相比，FSPCA模型所提取的主成分具备更好的解释性，这使得该模型更具实用价值。     

历史文献学视野下的重大历史事件

重大历史事件的提出源于国家文艺创作政策,是重大历史题材的内核。从历史文献学的视角来看,重大历史事件的文献形态表现为本源事件、衍生事件和文本事件。重大历史事件的衍生特征主要体现为本源事件的内容选择性、视角多样性、衍生多态性和历史叙事的结构层次性。重大历史事件具有文献能产性,其根本动力来源于历史主体的社会认可需要、纪念活动的客观物证需要和文艺创作的传奇叙事需要。     

Cities evolution tree and applications to predicting urban growth

China’s unprecedented urbanization and economic modernization have brought about significant growth and land use changes in cities and their surroundings. Traditional analyses of the relationship between urbanization and land use change have not fully incorporated important factors like city function or developmental stage. We define and apply a new visualization and analysis tool—an evolution tree—showing how an understanding of evolutionary pathways taken by growing cities contributes to visualization and forecasting of urban development and spatial expansion. We clustered 253 Chinese cities by type and developmental stage, arranging them in a “tree” structure, with types grouped as branches and leaf position along branches reflecting developmental stage. Urban growth rates are higher for business-oriented, manufacturing-oriented, and functionally comprehensive cities than for those oriented toward tourism. Extent of spatial growth is dominated by city type and developmental stage. Cities evolve along typical pathways, punctuated by occasional leap developments across functional types.     

创新理念的中国管理C模式解读

"创新"发展理念的践行与中国传统文化密切相关。中国古典哲学从儒、墨、道、法、兵、易、禅等学说为创新提供了"仁义"的价值内核、创新主体自由发展的驱动力、"德性管理、实践理性"的方法论、尚贤尚同的组织原则、"权变、逆向、谋算、质疑、直觉、发散、非线性"等创新思维、"博学、审问、慎思、明辨、笃行"的创新过程管理、"知行合一"的创新实践机制,"超越"的本质精神,以"整体性""导向性""动态性"的文化管理体系推动创新的生生不息。进一步整合西方创新理论与管理工具,则构建了中国管理C模式的创新管理系统模型。阴阳变易法则推动创新元素的融合转化与裂变,形成开放式、协同式的"有机组织",推动全面创新及自主创新。中国管理C模式实现了创新管理的价值性、工具性、实践性的统一,为大众创新提供了管理哲学视角的理论基础与方法论。     

A Design of Attributes Double Sampling Plans for Three-class Products

In this article, a new attributes double sampling plan for three-class products (ADSPTP) is presented, and the corresponding operating characteristic function is constructed based on the given procedure of performing ADSPTP. Average sample numbers (ASN) for complete inspection and curtailed inspection of the second sample are derived and the extreme point is discussed on the three-dimensional ASN surface. In addition, the differences arising from different parameters are studied. Sampling plans are designed by a nonlinear optimization model. Finally, numerical examples and discussions are given to illustrate the obtained results, and tables of the designed plans under various conditions are provided.