企业核心利益相关者利益要求实证分析

尽管利益要求存在显著差异,但不同企业核心利益相关者群体关注企业长期生存和发展的利益取向是一致的;共同的利益目标能减少治理成本,提高治理主体的收益,使核心利益相关者共同治理模式在企业实践中具有可操作性。     

Ka频段测控通信网链路特性及抗干扰技术

分析了Ka频段测控通信网的基本链路特性，对可能影响Ka频段链路性能的自然和人为干扰的形式以及采用Ka频段的抗干扰优势进行了描述与分析，提出了相应的抗干扰措施和对策。     

突发模式下PSK信号的载波估计和位同步技术

介绍了一种适合于突发模式下PSK信号的快速载波估计和位时钟恢复的算法,该算法基于特定图案的前导字,在前导字阶段采用匹配滤波相关的前向技术直接获取载波频差估计值和位同步时钟的相位信息,利用数字相关得到载波初相的估计值.此算法结构简单,可估计的载波频差范围约为符号率的±10%,且计算量不大,适合数字硬件实现.实测结果验证了该方法的可行性和有效性.     

参与PPP能否减轻企业税负——基于准自然实验的证据

政府与社会资本合作（PPP）模式在解决公共服务供给不足问题的同时，也给社会资本方的经营带来影响。企业参与PPP与政府建立良好合作关系是否有助于其税负的减轻？基于PPP概念股上市公司数据，本文采用准自然实验框架实证研究了企业参与PPP对其税负的影响。研究结果表明：企业参与PPP提高了其避税程度，降低了税负水平。分行业看，建筑业效应在统计上最为显著，而电力、热力等市政建设类项目企业参与PPP后税负不降反升。分区域看，东部和中部地区企业参与PPP对其税负有显著的降低，而西部地区并不显著。政策启示是在严格执行显性税收优惠的同时，规范PPP项目中政府与企业之间的利益关系。     

G省高教系统制度强审落实跟踪研究

面对审计工作的新定位新任务新要求,各地审计机关大力实施包括制度强审在内的强审工程建设。本文在对国内审计新形势、审计法律制度和制度强审研究的基础上,通过对高等教育系统内部审计职责、制度规范现状的分析,结合实践情况,提出制度建设完善的途径和措施;提出以规范单位内部管理、落实政策措施,加强信息化建设、人才建设、审计质量控制等为重点的制度建设框架;以严格制度执行监督、坚持依法审计、完善审计业务考核评价等为重点的制度执行机制;以提高依法审计意识和能力、落实跟踪、加强监督问责为手段的制度落实跟踪机制。通过制度强审落实与跟踪,动态监控制度建设、完善和执行情况,提升审计工作质量和效率,实现审计工作的法制化、制度化和规范化。     

Uncertainty and crude oil market volatility: new evidence

ABSTRACT

The main goal of this paper is to investigate the predictability of five economic uncertainty indices for oil price volatility in a changing world. We employ the standard predictive regression framework, several model combination approaches, as well as two prevailing model shrinkage methods to evaluate the performances of the uncertainty indices. The empirical results based on simple autoregression models including only one index suggest that global economic policy uncertainty (GEPU) and US equity market volatility (EMV) indices have significant predictive power for crude oil market volatility. In addition, the model combination approaches adopted in this paper can improve slightly the performances of individual autoregressive models. Lastly, the two model shrinkage methods, namely Elastin net and Lasso, outperform other individual AR-type model and combination models in most forecasting cases. Other empirical results based on alternative forecasting methods, estimation window sizes, high/low volatility and economic expansion/recession time periods further make sure the robustness of our major conclusions. The findings in this paper also have several important economic implications for oil investors.     

Relative Importance of Major Job Performance Dimensions in Determining Supervisors' Overall Job Performance Ratings

This study explores the factor structure of job performance and each performance dimension's relative importance in determining supervisors' overall job performance ratings. We found that the optimal factor structure of job performance includes five dimensions: task performance, organizational citizenship behaviour directed toward the organization and individuals (OCB‐O and OCB‐I, respectively), and counterproductive work behaviour directed toward the organization and individuals (CWB‐O and CWB‐I, respectively). The percent‐based relative weight (%RW) is the highest for task performance in determining job performance, followed by OCB and CWB. Interestingly, the %RW of non‐task performance dimensions directed toward the organization (OCB‐O and CWB‐O) is similar to the %RW of task performance but greater than the %RW of non‐task performance dimensions directed toward individuals (OCB‐I and CWB‐I). Copyright © 2018 ASAC. Published by John Wiley & Sons, Ltd.     

运用期权偏度分析对Black-Litterman模型的改进

Black-Litterman模型是在发达国家广为应用的投资组合模型，但该模型面临如何确定投资人主观收益的难题，当下的机构和个人投资者通常是运用经验性的数据随意确定其主观收益。实证分析表明，运用仿真方法测算期权的隐含波动率，通过期权波动率偏度分析建立Black-Litterman模型中的投资者主观收益，是对该模型的有效改进。     

外部信息自适应更新的SCMA系统译码方案

现有上行稀疏码多址接入（Sparse Code Multiple Access，SCMA）通信系统采用的译码算法中，基于串行策略的消息传递算法（Message Passing Algorithm，MPA）因其在每次迭代过程只选择单个消息进行更新，存在着收敛速度较慢等问题。针对以上问题，提出外部信息自适应更新的MPA算法，每次迭代过程中自适应选取多个残差值较大、相互独立的节点，更新其外部信息以达到提高计算效率的目的。仿真结果表明，该算法可有效提升译码性能，在计算复杂度与译码性能之间取得了较好的平衡。