采用改进的退化模型恢复湍流降质图像

采用考虑湍流内外尺度影响的退化模型来恢复大气湍流降质图像,运用包含了湍流内外尺度影响的波结构函数、折射率谱以及薄透镜成像的退化函数导出了新的退化模型。相对由Kolmogorov谱推导出的模型,该模型引入了更完整的先验约束条件,更接近大气湍流的物理特性。针对飞机目标湍流退化图像,利用约束最小二乘滤波的方法对该退化模型进行了复原验证,模拟结果表明了该模型比较理想,恢复效果较好。     

试析框架边梁与次梁约束力矩

按照边框架梁与次梁的空间受力状态，阐述钢筋混凝土框架边梁与楼面次梁整体现浇时相互之间的约束影响，并提出了框架边粱与次粱约束力矩的实用计算方法。     

Constrained Optimization Approaches to Estimation of Structural Models

Estimating structural models is often viewed as computationally difficult, an impression partly due to a focus on the nested fixed‐point (NFXP) approach. We propose a new constrained optimization approach for structural estimation. We show that our approach and the NFXP algorithm solve the same estimation problem, and yield the same estimates. Computationally, our approach can have speed advantages because we do not repeatedly solve the structural equation at each guess of structural parameters. Monte Carlo experiments on the canonical Zurcher bus‐repair model demonstrate that the constrained optimization approach can be significantly faster.     

浅析网络小说繁盛时代的隐忧

现今的网络小说进入了一个繁盛的时代,并引领着大众的阅读热潮,但在网络小说百花齐放的表象下却杂草丛生：网络小说对利益最大化的追逐导致了小说成了纯娱乐、纯感官刺激的消遣品,因此必然抛弃文学所坚守的精神追求,沦为商业时代下没有特色的商品,并大量复制,充斥市场,这对广大的读者来说是在不断吸收没有营养的精神快餐,有害无益。     

链路时延估计的约束最优化算法

网络层析成像技术能够通过测量端到端的时延来估计网络内部链路的时延特征．在单播网络层析成像技术研究现状上,提出了一种基于移动代理的网络信息收集机制,采用带约束的最优化方法对网络内部链路时延进行了估计．同时,通过仿真实验验证了在存在较大测量误差的网络条件下,该文算法提高了链路时延分布的推测精度．     

Design Improvements for Message Propagation in Malleable Social Networks

This study presents the formal problem definition and computational analysis of the network design improvements for idea and message propagation in both enterprise and consumer social networks (ESN and CSN, respectively). Message propagation in social networks is impacted by how messages are seeded in the network, and by propagation characteristics of the network topology itself. It has been recognized that the propagation properties of these networks can be actively influenced by network design interventions, such as the deliberate creation of new connections. We address the problem of finding cost‐effective message seeding, and identifying potential new network connections that allow improved propagation in social networks with cascade propagation. We use the hop‐constrained minimum spanning tree (HMST) model to find the seeds and possible new connections that result in networks with improved propagation properties. Moreover, we present new heuristic algorithms that substantially improve the solution quality for the HMST problem. Computational results posit that the design improvements proposed by the HMST approach can greatly improve cascade propagation performance of the networks at low cost.     

从“满洲国”的官僚体制看日本“民族协和”的虚伪性

1932年伪满洲国成立,伪东北行政委员会委员长张景惠以伪满洲国政府名义发表一系列所谓平等的言论;另一方面日伪政权所设立的伪满洲国官僚机构也以“民族协和”而冠冕堂皇之,但是在实际上却是由日本殖民者直接参政、操纵和控制傀儡政权。     

行政许可法与法治政府建设

行政许可法的颁布实施,是我国社会主义民主法制建设的一件大事,对政府工作将产生重大而深远的影响。作者从理论上论述了行政许可法实施的重大意义,提出了以贯彻实施行政许可法为契机,加快政府职能转变的具体措施。     

浅析行政事业单位固定资产管理的安全约束机制

针对当前行政事业单位固定资产管理中存在的问题,如固定资产管理与财务管理缺乏有机地衔接;综合利用率低和缺少资产综合监控手段等,论述了建立行政事业单位资产管理安全约束控制机制的缘由与对策。坚持管理手段创新,实现固定资产的信息化、网络化动态管理;坚持机制创新,实现行政事业单位固定资产约束控制安全化,坚持制度创新,建立行政事业单位固定资产约束控制制度,改变固定资产账目价值与实际价值相背离的现状。     

Teaching a chance course

We read in our daily newspapers and see on television reports on issues that use probability and statistics such as: the use of DNA fingerprinting in the courts, testing for aids, the interpretation of economic indicators, polls, medical trials etc. We describe a course called Chance whose aim is to teach the basic concepts of probability and statistics in the context of current issues and to make students better able to interpret and critically analyze what they read in the news about issues that affect their daily lives