调幅信号调制方式的分类与识别

调制样式识别和调制参数估计是电子对抗中的一个重要环节,也是信号分析的一个快速发展的领域。本文主要分析了模拟调幅AM和数字调幅2ASK及4ASK信号,然后提取了能有效区分它们的特征参数,用MATLAB软件完成了仿真实验。实验证明本文提取的特征参数是非常有效的。     

Geometrical nonlinear stability analyses of cable-truss domes

The nonlinear finite element method is used to analyze the geometrical nonlinear stability of cabletruss domes with different cable distributions. The results indicate that the critical load increases evidently when cables, especially diagonal cables, are distributed in the structure. The critical loads of the structure at different rise-span ratios are also discussed in this paper. It was shown that the effect of the tensional cable is more evident at small rise-span ratio. The buckling of the structure is characterized by a global collapse at small rise-span ratio; that the torsional buckling of the radial truss occurs at big rise-span ratio; and that at proper rise-span ratio, the global collapse and the lateral buckling of the truss occur nearly simultaneously. Project (No. 50278086) supported by the National Natural Science Foundation of China     

Retrieval parameter optimization using genetic algorithms

This paper describes our experiments on automatic parameter optimization for the Japanese monolingual retrieval task. Unlike regression approaches, we optimized parameters completely independently of retrieval models enabling the optimized parameter set to illustrate the characteristics of the target test collections. We adopted genetic algorithms as optimization tools and cross-validated with four test collections, namely the CLIR-J-J collections for NTCIR-3 to NTCIR-6. The most difficult retrieval parameters to optimize are the feedback parameters, because there are no principles for calibrating them. Our approach optimized feedback parameters and basic scoring parameters at the same time. Using test sets and validation sets, we achieved effectiveness levels comparable with very strong baselines, i.e., the best-performing NTCIR official runs.     

随机时滞双稳系统中的参数调节随机共振

利用参数调节的方法,在随机时滞双稳系统中实现了随机共振.研究了时滞和反馈强度对系统的影响.对比了常规随机共振和参数调节随机共振的信噪比曲线,从而验证了参数调节随机共振在应用范围和性能上的优越性.     

n维非对称损失函数的参数设计

本文讨论了在n维非对称的质量损失函数下，调整参数设计的可行性，求出了质量损失的最小解．     

线性双端口网络的参数表征法及其意义

对线性双端口网络的表征加以说明,根据其参数中所选激励变量的不同,导致所描述的方程组和与其对应的参数组也不同的特点,整理出参数表征法归纳表,并对相关的物理意义给予了讨论。     

企业专利运营平台建设的关键要素与模型构建实证研究

通过对现有专利运营平台功能特点的调研及运营实践的梳理,结合企业专利运营特点,利用集合论方法,提出企业专利运营平台建设五项关键要素及14项二级要素,完成模型构建及参数提取,同时以中国电力科学研究院有限公司为例开展实证研究,完成专利运营平台试点构建,为企业突破专利运营瓶颈、建设专利运营平台提供理论参考及工具。     

Rechtliche Rahmenbedingungen für die Gestaltung universit?rer Curricula

Die bereits im Zuge der Autonomie-St?rkung der Universit?ten durch das UOG 1993 im Rahmen der Erlassung des UniStG 1997 vorgenommene Aufwertung der Selbstregelungskompetenzen der Universit?ten bei der Gestaltung des Studienrechts, findet in der Fassung der studienrechtlichen Vorgaben des UnivG 2002 seine konsequente Fortsetzung. Diese Ausweitung der Selbstregelungskompetenzen geht im rechtsstaatlichen Sinne typischerweise (als Gegengewicht) mit besonderen Anforderungen an Rechtsschutz und Rechtssicherheit einher. Insofern hat der universit?re Verordnungsgeber auch auf die in den Gesetzesgrundlagen zum Ausdruck kommenden Wertungen und Grunds?tze eingehend Bedacht zu nehmen.     

On exploiting propagation delays for passive target localization using bearings-only measurements

For many cases, target localization accuracy can significantly improve by accounting for the propagation delay between the target source and the sensors. This paper considers when it is advantageous to compensate for the propagation delay for the case of a network of nodes where each node consists of an array of sensors. Each node calculates a direction of arrival (DOA) from the raw data, and these DOAs are combined to localize the target. First, we consider the case when no prior data are given and the localization occurs using DOA measurements from a single snapshot. Such localization methods are necessary to initiate a target track. Finally, we investigate the case where an extended Kalman filter is used to aggregate measurements over multiple snapshots.     

大规模教育测评中实际运用矩阵取样技术的基本问题

矩阵取样技术对解决教育等社会科学领域大规模调查中的较低应答率和较差的数据质量问题具有独特价值,在大规模测评中所获得的测评结果具有更高的群体代表性和稳定性。依照每个测评项目的测验目的,考虑对测验结果参数估计准确性的具体要求、综合权衡测验开发中的各种相关成本、选择题册设计方式,从而确定具体的方案是该项技术实际运用过程中必须慎重对待的三个基本问题。