基于邻域信息的噪声图像的恢复

噪声图像的恢复是影响图像信息提取的一个重要因素。主要针对现存的噪声图像恢复算法在消除细线及椒盐噪声方面的困难,基于待检像素的邻域信息提出了一种针对细线和椒盐噪声感染的图像的恢复算法。实验结果表明,文中所提算法不仅具有很好的抑制细线及椒盐噪声的效果,而且有效地保存了图像的细节与结构信息,同时对其它的噪声也有一定的抑制作用。     

Investor Sentiment and Stock Returns: Evidence from Turkey

This paper investigates the relation between investor sentiment and stock returns on the Istanbul Stock Exchange, employing vector autoregressive (VAR) analysis and Granger causality tests. The sample period extends from July 1997 to June 2005. In the VAR models, stock portfolio returns and investor sentiment proxies are used as endogenous variables. Two dummy variables accounting for natural and economic crises are used as exogenous variables. The analysis results suggest that, excepting shares of equity issues in aggregate issues, stock portfolio returns seem to affect all investor sentiment proxies, namely closed-end fund discount, mutual fund flows, odd-lot sales-to-purchases ratio, and repo holdings of mutual funds. Investor sentiment does not appear to forecast future stock returns; only the turnover ratio of the stock market seems to have forecasting potential.     

房地产市场噪声交易行为分析——基于进化博弈理论的视角

噪声交易是房地产市场长期存在的一种现象,理性交易者与噪声交易者也长期并存于房地产市场。本文运用进化博弈理论研究房地产市场噪声交易者行为,分析噪声交易行为的复制动态,得到了理性投资者不可能利用投机行为把噪声交易者逐出市场的结论,同时给出了当博弈达到稳定均衡时选择理性交易策略和噪声交易策略的比例。     

股改前后中国股市噪声比较分析

以方差比检验(Variance-ratio test,VRT)为基础,构造一个噪声成分检验指标(Noise composition test,NCT),并以此做纵向分析,考察中国股票市场在股改前和股改后的噪声成分;同时,以40支近似全流通的股票和整个大盘做横向比较,得出的结论是:股权分置是噪声的重要来源,而股权分置改革和全流通有效地抑制了非理性因素和噪声。     

A Tutorial on Palm Distributions for Spatial Point Processes

This tutorial provides an introduction to Palm distributions for spatial point processes. Initially, in the context of finite point processes, we give an explicit definition of Palm distributions in terms of their density functions. Then we review Palm distributions in the general case. Finally, we discuss some examples of Palm distributions for specific models and some applications.     

企业税负与会计信息质量关系研究

以2015—2021年沪深A股上市公司为样本,探讨企业税负对会计信息质量的作用方向、作用机制与差异化作用效果。研究发现：降低企业税负可以显著提高会计信息质量,这一结论经一系列稳健性检验后仍成立。机制分析结果表明,降低企业税负能够通过减少融资约束和代理成本两条中介路径来提高会计信息质量。异质性分析结果表明,在纳税贡献高、审计任期短以及分析师关注度高的公司中,降低企业税负对会计信息质量的提高作用更加明显。     

铁岭市老城区环境噪声适用区域应重新划分的研究

铁岭市老城区用地规划已发生很大变化,现行的《铁岭市城区环境噪声适用区域划分方案》已不适用,按照《城市区域环境噪声适用区划分技术规范》重新划分铁岭市老城区环境噪声适用区域,对比现行的《铁岭市城区环境噪声适用区域划分方案》,分析重新划分的必要性。     

《塑料成型工艺与模具设计·“干涉”现象》项目教学设计

本文通过分析《塑料成型工艺与模具设计》课程专业背景和课程地位,确定了《"干涉"现象》教学项目的教学目标,通过精心的教学设计和实施达到以能力培养为目的,以学生为主体,以训练项目为驱动较好地提升学生发现问题、解决问题的能力,合理进行模具设计的目的。     

Effective experimental controls for research in international accounting: Further thoughts

This paper responds to recent research by Ruland et al. [Ruland, W., Shon, J., Zhou, P., 2007. Effective controls for research in international accounting. Journal of Accounting and Public Policy, 26(1), 96–116.] that addresses the effectiveness of experimental controls for research in international accounting, with focus on Ndubizu and Sanchez [Ndubizu, G.A., Sanchez, M.H., 2006. The valuation properties of earnings and book value prepared under US GAAP in Chile and IAS in Peru. Journal of Accounting and Public Policy 25 (2)]. We attempt to remove some misconceptions about effective experimental controls that have surfaced in the debate. We argue that theory and refined proxies alleviate many of the control issues that have surfaced in the literature.     

X频段介质谐振振荡器的设计

介绍一种适合X频段并联反馈型介质谐振振荡器的设计方法及其相关理论,采用计算机仿真技术分析影响振荡器相位噪声的一些因素,并设计了一个X频段的并联反馈型介质谐振振荡器,验证了采用减小介质谐振器耦合的方法来改善输出相位噪声的可行性。